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USA and South Korea’ show of bombing force against North Korea

Korean peninsula draws range of military drills in show of force against North Korea http://www.reuters.com/article/us-northkorea-missiles/korean-peninsula-draws-range-of-military-drills-in-show-of-force-against-north-korea-idUSKCN1BT0CK, Ben Blanchard, Hyonhee Shin BEIJING/SEOUL (Reuters) 18 Sept 17, – The U.S. military staged bombing drills with South Korea over the Korean peninsula and Russia and China began naval exercises ahead of a U.N. General Assembly meeting on Tuesday where North Korea’s nuclear threat is likely to loom large.

The flurry of military drills came after Pyongyang fired another mid-range ballistic missile over Japan on Friday and the reclusive North conducted its sixth and most powerful nuclear test on Sept. 3 in defiance of United Nations sanctions and other international pressure.

A pair of U.S. B-1B bombers and four F-35 jets flew from Guam and Japan and joined four South Korean F-15K fighters in the latest drill, South Korea’s defense ministry said.

The joint drills were being conducted “two to three times a month these days”, Defence Minister Song Young-moo told a parliamentary hearing on Monday.

In Beijing, the official Xinhua news agency said China and Russia began naval drills off the Russian far eastern port of Vladivostok, not far from the Russia-North Korea border. Those drills were being conducted between Peter the Great Bay, near Vladivostok, and the southern part of the Sea of Okhotsk, to the north of Japan, it said.

The drills are the second part of China-Russian naval exercises this year, the first part of which was staged in the Baltic in July. Xinhua did not directly link the drills to current tension over North Korea.

China and Russia have repeatedly called for a peaceful solution and talks to resolve the issue.

On Sunday, however, U.S. Ambassador to the United Nations Nikki Haley said the U.N. Security Council had run out of options on containing North Korea’s nuclear program and the United States might have to turn the matter over to the Pentagon.

September 22, 2017 Posted by | South Korea, USA, weapons and war | Leave a comment

China considers rescuing problematic UK Moorside nuclear station project

China mulls Moorside nuclear rescue deal to deepen roots in UK plants http://www.telegraph.co.uk/business/2017/09/19/china-mulls-moorside-nuclear-rescue-deal-deepen-roots-uk-plants/  China’s state-backed nuclear company is hoping to take an equity stake in the troubled £10bn Moorside new nuclear project being developed by debt-hit Toshiba.

The Japanese conglomerate is on the hunt for a project partner to safeguard Europe’s largest planned new nuclear plant after France’s Engie abandoned its support of the venture in the wake of Toshiba’s spiralling financial woes.

China General Nuclear (CGN) confirmed that it is in the running to shore up the 3.8GW project in exchange for an equity share, in a move which would also deepen its stake in the UK’s nuclear ambitions. “We are willing to utilise our experience in nuclear design, construction and operation for more than 30 years to support the development of Britain’s nuclear industry,” CGN confirmed in a statement to Reuters.

CGN joins South Korea’s Kepco which voiced an interest in the project earlier this summer.

The South Korean state-backed utility has harboured an interest in Moorside since 2013, but said it would want to use its own nuclear design rather than one made by Toshiba’s Westinghouse nuclear business.

Westinghouse plunged into Chapter 11 bankruptcy in the US earlier this year after amassing losses of $9bn (£6.6bn) for Toshiba due to a string of struggling US projects.The deal would hand CGN access to a fourth nuclear project in the UK. It has already teamed up with EDF Energy to finance a third of the Hinkley Point C project and a fifth of its Sizewell B nuclear plans.

 In the future CGN also plans to lead the plans to build the Bradwell C nuclear plant in Essex with a 66pc stake in the venture.

At Moorside CGN is also likely to want to use its own reactor design, in order to prove its mettle to other prospective new markets. However, it will take at least four years before CGN’s reactor design could be approved by the nuclear authority for use in the UK.

A lengthy approval process would also be required of a Kepco reactor design which could derail the 2025 start date by at least two years in a further blow to the UK’s new nuclear ambitions.

EDF admitted earlier this year that the start-up date for Hinkley Point C is likely to be two years later than first thought at 2027 and pile a further €1bn (£870m) to €3bn euros on to the construction costs of the £18bn project.

The delays to new nuclear projects raises questions over the UK’s energy supplies in the middle of the next decade. More than two thirds of the country’s power generation capacity will have retired between 2010 and 2030.

September 22, 2017 Posted by | China, marketing, UK | Leave a comment

Cooling systems at five NRA-cleared nuke plants could fail if nearby volcanoes erupt

n-reactors-g-20170920

 

Five nuclear power plants that have passed safety clearances may be at risk of having their cooling systems crippled during huge eruptions of nearby volcanoes, the nation’s nuclear safety watchdog said Monday.

The five plants are Kyushu Electric Power Co.’s Sendai and Genkai plants in Kagoshima and Saga prefectures, respectively, the Mihama and Oi plants, both in Fukui Prefecture and run by Kansai Electric Power Co., and the Ikata plant in Ehime Prefecture run by Shikoku Electric Power Co.

Additional research and data have revealed that the possible concentration of volcanic ash from huge eruptions could soar up to around 100 times that previously estimated. The findings emerged only after screenings of the plants by the Nuclear Regulation Authority.

According to the Federation of Electric Power Companies of Japan, the concentration of volcanic ash that would be spewed could exceed the limit of the plants’ air filters.

In the event that volcanoes nearby erupt, the five plants and eight of their reactors could lose their external power supply and their emergency diesel generators would be rendered useless, according to the nuclear authority.

It now aims to raise the density level of volcanic ash that can affect nuclear plants by 100 times the current level, while pressing utilities to upgrade their air filters.

Reactor No. 3 at the Ikata plant and reactors Nos. 3 and 4 at the Genkai plant top the list of those most likely to be affected by clogged filters.

News of the findings by the NRA followed Kyushu Electric Power’s move Friday requesting that the regulatory agency perform inspections on the No. 4 reactor at the Genkai plant because it aims to put the reactor back online in early March. Pre-operational checks are the last procedure on the list to be carried out before a nuclear reactor can restart.

Kyushu Electric plans to load 193 fuel assemblies into the reactor in February. After reactivating it in early March, commercial operations scheduled to start in April. If things work out as planned, the No. 4 reactor will be active for the first time since December 2011, when it was halted for routine checkups.

On March 11 of that year, reactor cooling systems at the Fukushima No. 1 power plant were crippled following a powerful earthquake and massive tsunami, resulting in the world’s worst nuclear disaster since Chernobyl. The tsunami inundated the six-reactor plant, located 10 meters above sea level, and flooded power supply facilities there.

Reactor cooling systems were crippled. Reactors Nos. 1 to 3 suffered fuel meltdowns, while hydrogen explosions damaged the buildings housing reactors No. 1, No. 3 and No. 4.

The five nuclear plants passed the tougher safety requirements introduced after the Fukushima meltdowns.

https://www.japantimes.co.jp/news/2017/09/19/national/cooling-systems-five-nra-cleared-nuke-plants-fail-nearby-volcanoes-erupt/#.WcGPZBdx3rc

September 20, 2017 Posted by | Japan | , | Leave a comment

Kyushu Electric plans to restart Genkai No. 4 reactor in March

genkai npp.jpgKyushu Electric Power Co. aims to bring the No. 4 unit (left) at its Genkai nuclear power plant in Saga Prefecture back online in early March.

 

SAGA – Kyushu Electric Power Co. on Friday has asked the Nuclear Regulation Authority to perform pre-operation inspections for the No. 4 reactor at the Genkai nuclear power plant in Saga Prefecture, telling the regulator it aims to put the reactor back online in early March.

Pre-use checks are the last procedure on the list for restarting a nuclear reactor.

Kyushu Electric plans to load 193 fuel assemblies into the reactor in February. After reactivating it in early March, the utility plans to start commercial operations in April.

If things work out as planned, the No. 4 reactor will be active for the first time since December 2011, when it was halted it for routine checkups.

In January this year, the NRA concluded that the No. 3 and No. 4 reactors at the plant in the town of Genkai meet the tougher safety standards introduced in July 2013 after the triple core meltdown at Tokyo Electric Power Company Holdings Inc.’s disaster-stricken Fukushima No. 1 plant in Fukushima Prefecture in March 2011.

The two reactors have passed all screenings required for reactivation. The Saga prefectural and Genkai municipal governments have already approved the restarts.

The No. 3 reactor is currently undergoing pre-use inspections and is expected to go back online in early January.

https://l.facebook.com/l.php?u=https%3A%2F%2Fwww.japantimes.co.jp%2Fnews%2F2017%2F09%2F15%2Fnational%2Fkyushu-electric-plans-restart-genkai-no-4-reactor-march%2F%23.Wbv2yrLyu3A&h=ATNLamXCCrPh6XY_RaeC4xDGzLRNIeTPsj1lMSVqe9DYkKBqZbplKHRkPvrBWTrDrl1sfIFuSuMVxqHlQwSl00bd3yfnW-hzr9YKhjURM8CKFWP_cCkDsIiwA6_igmTWjcAYLUSExvuw52tdtNUCIz81HKAvjT2ubbra7dH95Dp9u-Ftq2VJVRPziU21J3EGoYcuIlQkbfDFM7C8iXkJobR12ZAGFYx4G9Vu330iyvNpXXJzU9rpYtgL9ytpKmXP_1y0drRDWcO98YSVMktOm16x46zT0Xz8-JkW9ih6Dg

September 20, 2017 Posted by | Japan | | Leave a comment

A Rethink On North Korean Nuclear Crisis – some analysts say that it’s time for this

Some Analysts Say Time May Be Right For A Rethink On North Korean Nuclear Crisis, NPR, September 17, 2017, ANTHONY KUHN

North Korea test-launched another missile Friday that arced over northern Japan and into the Pacific, showing its progress toward being able to strike the U.S. and signaling its defiance of U.N. sanctions imposed after its sixth, and most recent, nuclear testearlier this month.

“The world will never accept a nuclear-armed North Korea,” U.S. Ambassador Nikki Haley told the U.N., after the sanctions passed the Security Council on Monday. She added: “If the North Korean regime does not halt its nuclear program, we will act to stop it ourselves.”

But some analysts believe that this approach to the North Korean nuclear crises is dangerously deluded.

A decade or so ago, it still may have been possible to use sanctions or the threat of military force to compel North Korea to give up its nuclear programs, argues Zhao Chu, an independent, Shanghai-based analyst, former soldier and former editor of World Outlook, a foreign affairs magazine.

But Zhao warns that the situation has now fundamentally changed, and that trying to fly through a window of opportunity that has already closed is a very bad idea. Pyongyang can hardly be expected to give up the nuclear ace in the hole that it worked so long to acquire.

Then again, perhaps the window of opportunity for military action was never open, argues Lyle Goldstein, an associate professor in the Strategic Research Department at the U.S. Naval War College in Newport, Rhode Island. This is because the South Korean capital, “Seoul was always so vulnerable” to North Korean conventional artillery attacks, which could cause mass casualties.

Analysts say North Korea looked at the fate of other authoritarian regimes, particularly Libya under Moammar Gadhafi and Iraq under Saddam Hussein, and concluded that their lack of nuclear weapons left them vulnerable to being toppled by the U.S. and its allies.

Pyongyang now believes — correctly or not — that, by acquiring the ability to carry out a nuclear strike against the U.S., it has taken a crucial step toward assuring its own survival.

“You could credit the Kim regime with taking regime change off the table,” says the U.S. Naval War College’s Goldstein.

Another way of looking at it is that North Korea has now gained a valuable bargaining chip. And while it is unlikely to give it away for nothing, it may be willing to trade it for some sort of security guarantee, or some form of payment, whether in food or energy.

A grimmer possibility, of course, is that it might just sell it to raise much-needed cash.

Here, Goldstein sees an opportunity to strike a bargain with North Korea to resolve the crisis. He says that years of using all sticks and no carrots have not yielded the required results, and it’s time for some creative thinking.

Goldstein rejects the idea that the only way to improve North Korea is through regime change. “There are plenty of obnoxious regimes around the world,” he says, “and more than a few are allies of the United States.”…..

“I think we should take a pragmatic attitude and tolerate a nuclear North Korea,” Zhao concludes. “Why did the U.S. and China tolerate India and Pakistan going nuclear? Because they had no better options.”

All that’s left to do, Zhao says, is to try to prevent North Korea from proliferating nuclear technology, help it to avoid nuclear accidents, and set up unofficial dialogues to get scholars, if not officials, discussing possible solutions.

Indeed, China’s government realizes that North Korea’s nuclear disarmament is no longer an option in the near term, Zhao argues. It has therefore signaled in its public statements that for now, its top priority is to prevent the outbreak of war on the Korean Peninsula, or as the government puts it, to prevent “chaos on our doorstep.” http://www.npr.org/sections/parallels/2017/09/17/551214870/some-say-its-time-to-rethink-responses-to-north-korea-nuclear-crisis

September 18, 2017 Posted by | North Korea, politics international, USA | Leave a comment

China urges USA to find ways other than threats, to deal with North Korea

US must stop North Korea threats, says China, as Kim Jong-un aims for military ‘equilibrium’
Chinese ambassador says America needs to do ‘much more’ to achieve cooperation as Kim Jong-un speaks of goal of equalling US military might,
Guardian, Tom Phillips , 16 Sept The United States must stop threatening North Korea’s leader if a peaceful solution to the nuclear crisis is to be found, China’s ambassador to Washington has said, as Kim Jong-un reiterated his country’s aim to reach military “equilibrium” with the US.

Cui Tiankai told reporters in Washington: “They [the US] should refrain from issuing more threats. They should do more to find effective ways to resume dialogue and negotiation.”

“Honestly, I think the United States should be doing … much more than now, so that there’s real effective international cooperation on this issue.”

North Korea’s state news agency, KCNA on Saturday quoted Kim as saying: “Our final goal is to establish the equilibrium of real force with the US and make the US rulers dare not talk about military option.”

The US warned on Friday it could revert to military options if the latest sanctions fail to curb North Korean missile and nuclear tests, after Pyongyang fired a missile over Japan for the second time in two weeks.

 US national security advisor HR McMaster said: “We have been kicking the can down the road and we’re out of road. For those who have been commenting about the lack of a military option – there is a military option. Now, it’s not what we prefer to do, so what we have to do is call on all nations to do everything we can to address this global problem, short of war.”

Earlier, the US secretary of state, Rex Tillerson urged Russia and China to “indicate their intolerance for these reckless missile launches by taking direct actions of their own”.

The Chinese ambassador was speaking after Pyongyang fired a missile over Japan for the second time in two weeks a move the UN security council said it “strongly condemned”.

Speaking in Beijing, a foreign ministry spokeswoman said China opposed the launch but also urged the US to change its tactics towards Pyongyang. “China is not to blame for the escalation of tensions. China does not hold the key to resolving the Korean peninsula nuclear issue, either. Those who tied the knots are responsible for untying [them].”……..https://www.theguardian.com/world/2017/sep/16/us-must-stop-north-korea-threats-says-china-kim-jong-un-military-equilibri

September 18, 2017 Posted by | China, North Korea, politics international, USA | 1 Comment

Report that North Korea may be secretly building nuclear submarine

North Korea secretly building nuclear submarine: report Washington Times,  – The Washington Times – Sunday, September 17, 2017  North Korea is clandestinely building a nuclear-powered submarine, according to a Japanese newspaper report highlighting the potential new threat from Pyongyang, whose increased naval activities during recent months already had U.S. military and intelligence officials on edge.

The report by Japan’s Sekai Nippo — citing an “informed” but unnamed “source familiar with the North Korean situation” — said the size of the nuclear-powered submarine under construction is unclear, but that the Kim Jong Un regime in Pyongyang hopes to have it deployed within three years.

The claim could not be independently verified by The Washington Times and U.S. intelligence sources could not immediately be reached for comment. If true, however, the claim could indicate a dramatic naval evolution by North Korea, which analysts say presently has a fleet of between 50 and 60 diesel-electric submarines that are louder and easier to detect than nuclear-powered vessels…….http://www.washingtontimes.com/news/2017/sep/17/report-north-korea-secretly-building-nuclear-subma/

September 18, 2017 Posted by | North Korea, weapons and war | Leave a comment

USA again talking of “military options” against North Korea

US warns of military option if North Korea nuclear and missile tests continue
UN ambassador and national security adviser float possibility if new sanctions fail: ‘We have been kicking the can down the road and we’re out of road’,
Guardian, Julian Borger , Justin McCurry and Tom Phillips , 16 Sept 17,  The US has warned it could revert to military options if new sanctions fail to curb North Korean missile and nuclear tests, after Pyongyang fired a missile over Japan for the second time in two weeks.

The US ambassador to the UN, Nikki Haley, and the national security advisor, HR McMaster, told reporters that the latest set of UN sanctions – imposed earlier this week after North Korea’s sixth nuclear test – would need time to take effect, but they suggested that after that, the US would consider military action……..

In a unanimous statement late on Friday, the UN Security Council said it “strongly condemned” the missile launch, but did not threaten further sanctions on Pyongyang.

The missile flew further than any missile tested by the regime, triggering emergency sirens and text alerts minutes before it passed over the northern Japanese island of Hokkaido on Friday morning.

Flight data shows the missile travelled higher and further than the one involved in the 29 August flyover of Japan, suggesting the regime is continuing to make advances in its missile and nuclear weapons programmes.

A new UN security council session was called on Friday to address North Korean defiance, but Haley said there was little more that UN measures could do to change Pyongyang’s behaviour…….

when he was asked about a possible US military response, Mattis said: “I don’t want to talk about that yet.”…..

Many strategic analysts argue there is no feasible military option for curtailing North Korean nuclear and missile development, as any pre-emptive attack would be likely to trigger a devastating barrage on Seoul, without any guarantee that all Pyongyang’s missiles and nuclear weapons would be put out of action……..

The Chinese foreign ministry spokeswoman Hua Chunying said Beijing objected to North Korea’s latest launch but believed diplomacy was the only way to solve the “complicated, sensitive and grim” problem.

“The top priority is now to prevent any provocative acts,” Hua told reporters.

But Hua rejected the theory – advanced, among others, by Trump and Theresa May, the British prime minister – that Beijing held the key to thwarting Kim Jong-un’s nuclear and missile ambitious.

“China is not the focus. China is not the driving force behind the escalating situation. And China is not the key to resolving the issue,” Hua said.

Hua said China had already made “great sacrifices” and “paid a high price” in its bid to help rein in Pyongyang: “China’s willingness and its efforts to fulfill its relevant international responsibilities cannot be questioned.”

In an online editorial, the Communist party-controlled Global Times newspaper said it was the US and South Korea, not China, that needed “to guide North Korea into a new strategic direction” through dialogue.

“An isolated North Korea will be more rational if the international society treats it in a rational way,” argued the newspaper, which sometimes reflects official views. It said attempts to intimidate North Korea with threats or shows of force would fail. https://www.theguardian.com/world/2017/sep/15/north-korea-us-military-option-nuclear-tests

September 16, 2017 Posted by | North Korea, politics international, USA | Leave a comment

Abe says Japan won’t accept North Korea as nuclear power

Japan won’t accept North Korea as nuclear power, Abe says, Nikkei Asian Review, 14 Sept  
Prime minister vows to fortify defense, but rejects pursuit of strike capability, 
TOKYO — As North Korea rapidly develops its nuclear weapons capability and China grows as the top economic and military power in the region, Japanese Prime Minister Shinzo Abe vowed to stop Pyongyang’s nuclear program and to strengthen Japan’s defense capabilities in an interview with The Nikkei and the Nikkei Asian Review……..

“The international community must put pressure on North Korea until it commits to give up the nuclear weapons program. There is little point pursuing dialogue for the sake of dialogue. It has to be aimed at changing North Korea’s policies. We welcome that a new sanctions resolution was passed by the U.N. Security Council at such a speed and in a unanimous vote with support from both China and Russia…..”
“..Recognizing North Korea as nuclear power means treating it as equal (to other nuclear powers), That would be a wrong step to take. Once it is recognized as nuclear power, there will be no stopping other countries from seeking the same status. It would greatly increase the risk of nuclear proliferation.”……..https://asia.nikkei.com/Politics-Economy/International-Relations/Japan-won-t-accept-North-Korea-as-nuclear-power-Abe-says

September 16, 2017 Posted by | Japan, politics international | Leave a comment

Rdioactive particles detected in soils from Northern Japan

Science Direct (accessed) 11th Sept 2017, Arnie Gundersen & Marco Kaltofen: Radioactively-hot particles detected in dusts and soils from Northern Japan by combination of gamma spectrometry,
autoradiography, and SEM/EDS analysis and implications in radiation risk
assessment. After the March 11, 2011, nuclear reactor meltdowns at
Fukushima Dai-ichi, 180 samples of Japanese particulate matter (dusts and
surface soils) and 235 similar U.S. and Canadian samples were collected and
analyzed sequentially by gamma spectrometry, autoradiography, and scanning
electron microscopy with energy dispersive X-ray analysis.
http://www.sciencedirect.com/science/article/pii/S0048969717317953

September 16, 2017 Posted by | environment, Japan | Leave a comment

President Moon says No to nuclear weapons in South Korea

No nuclear weapons in South Korea, says President Moon, By Paula Hancocks and James Griffiths, CNN September 14, 2017 

Story highlights

September 15, 2017 Posted by | politics, South Korea, weapons and war | Leave a comment

South Korean opposition party in USA asking Washington for nuclear weapons

A South Korean delegation asks Washington for nuclear weapons, WP,  September 14, 17The heated debate in South Korea over redeploying U.S. nuclear weapons on its territory has now reached Washington. A senior delegation of South Korean lawmakers is in town making the case to the Trump administration and Congress that such a move is needed to confront North Korea’s growing nuclear capability and place more pressure on China.

“We are here to ask for redeployment of tactical nuclear warheads in South Korea,” Lee Cheol Woo, the head of the intelligence committee of South Korea’s National Assembly, told me Thursday morning.

Lee is heading a delegation of members of the Liberty Korea Party, the opposition to President Moon Jae-in’s Democratic Party. He is also the chairman of the assembly’s special committee for nuclear crisis response.

Moon told CNN yesterday that he does not agree that tactical nuclear weapons should be reintroduced to South Korea or that Seoul should develop its own nuclear weapons. He warned it could “lead to a nuclear arms race in northeast Asia.” But Lee’s delegation believes that as the North Korea nuclear crisis worsens, a push by the Trump administration or Congress could help persuade Moon’s government to change its position, as it has already done regarding the deployment of the THAAD missile defense system……https://www.washingtonpost.com/news/josh-rogin/wp/2017/09/14/a-south-korean-delegation-asks-washington-for-nuclear-weapons/?utm_term=.fa0b8e508c36

September 15, 2017 Posted by | politics, South Korea, weapons and war | Leave a comment

North Korea’s nuclear threats to Japan

North Korea Threatens Nuclear Weapon Action On Japan, U.S. For Supporting UN Sanctions”Japan is no longer needed to exist near us.” HuffPost  14/09/2017 A North Korean state agency threatened on Thursday to use nuclear weapons to “sink” Japan and reduce the United States to “ashes and darkness” for supporting a U.N. Security Council resolution and sanctions over its latest nuclear test.
Pyongyang’s Korea Asia-Pacific Peace Committee, which handles the North’s external ties and propaganda, also called for the breakup of the Security Council, which it called “a tool of evil” made up of “money-bribed” countries that move at the order of the United States.

“The four islands of the archipelago should be sunken into the sea by the nuclear bomb of Juche. Japan is no longer needed to exist near us,” the committee said in a statement carried by the North’s official KCNA news agency.

 Juche is the North’s ruling ideology that mixes Marxism and an extreme form of go-it-alone nationalism preached by state founder Kim Il Sung, the grandfather of the current leader, Kim Jong Un.

Regional tension has risen markedly since the reclusive North conducted its sixth, and by far its most powerful, nuclear test on Sept. 3.

The 15-member Security Council voted unanimously on a U.S.-drafted resolution and a new round of sanctions on Monday in response, banning North Korea’s textile exports that are the second largest only to coal and mineral, and capping fuel supplies.

The North reacted to the latest action by the Security Council, which had the backing of veto-holding China and Russia, by reiterating threats to destroy the United States, Japan and South Korea.

“Let’s reduce the U.S. mainland into ashes and darkness. Let’s vent our spite with mobilization of all retaliation means which have been prepared till now,” the statement said…….. http://www.huffingtonpost.com.au/2017/09/14/north-korea-threatens-nuclear-weapon-action-on-japan-u-s-for-supporting-un-sanctions_a_23208647/

September 15, 2017 Posted by | North Korea, politics international, weapons and war | Leave a comment

Mystery seismic energy release following North Korea nuclear test

Seismologists stumped by mystery shock after North Korean nuclear test, Nature
A second jolt felt minutes after this month’s detonation continues to confound researchers.
 David Cyranoski, Eight-and-a-half minutes after North Korea set off a nuclear bomb on 3 September, a second burst of energy shook the mountain where the test had just occurred. More than a week later, researchers are still puzzling over what caused that extra release of seismic energy — and what it says about North Korea’s nuclear-testing site, or the risks of a larger radiation leak. Monitoring stations in South Korea have already picked up minute levels of radiation from the test.

A number of theories have emerged to explain the second event, ranging from a tunnel collapse or a landslide to a splintering of the rock inside Mount Mantap, the testing site. But seismologists can’t agree and say that they may not get enough evidence to pin down the cause.

“This is an interesting mystery at this point,” says Göran Ekström, a seismologist at Columbia University in New York City.   The nature of the first seismic signal is clearer because it matches the profile of a bomb blast. The US Geological Survey (USGS) determined the magnitude of the seismic event associated with the nuclear explosion at 6.3, whereas the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) in Vienna calculated it at 6.1 on the basis of a separate analysis. The explosion was many times the size of past North Korean tests and was the largest seismic signal from a nuclear test ever detected by the international network of seismic monitoring stations used by the CTBTO.

The second event came 8.5 minutes later and registered as magnitude-4.1, reported the USGS. The agency suggested that it was associated with the test and may have been a “structural collapse”. The possibility that the smaller shock was caused by a tunnel collapse inside the testing site has dominated discussion in the media. But Paul Earle, a seismologist at the USGS, told Nature that was just one possibility that was raised in the immediate aftermath of the explosion. The USGS, he said, was “basing that on previous nuclear tests of comparable size that had a collapse”.

Possible signs of a collapse are visible on satellite images taken of the testing site, according to an analysis released on 12 September by 38 North, a partnership of the US-Korea Institute and the Johns Hopkins School of Advanced International Studies in Washington, DC.

But the seismic signal doesn’t match what would be expected from a collapse, says Lianxing Wen, a geophysicist at the State University of New York at Stony Brook. A collapse would produce mostly vertical movement of rock, but his own unpublished work suggests that the seismic clues point to a large horizontal movement as well, something he says would be more consistent with a landslide.

Sliding scale

Although the satellite data do show a lot of landslides on Mount Mantap, other researchers argue that they could not have caused the magnitude-4.1 event. Much larger landslides, such as at Bingham Canyon mine in Utah in 2013, haven’t produced seismic signals close to that size, says Ekström.  He also argues that the seismic signals he has seen do not match the pattern expected from a landslide……https://www.nature.com/news/seismologists-stumped-by-mystery-shock-after-north-korean-nuclear-test-1.22618

September 15, 2017 Posted by | incidents, North Korea | Leave a comment

Nuclear regulator defers giving safety OK for idle Tepco reactors at Kashiwazaki-Kariwa plant

Screenshot from 2017-09-15 01-39-06.png

TOKYO (Kyodo) — Japan’s nuclear safety watchdog on Wednesday deferred giving safety clearance for two idle Tokyo Electric Power Company Holdings Inc. reactors on the Sea of Japan coast, although its chairman said the utility was “qualified” as a nuclear plant operator.

Nuclear Regulation Authority Chairman Shunichi Tanaka said following Wednesday’s meeting that Tepco, operator of the crippled Fukushima Daiichi nuclear power plant, was qualified but needs to stipulate its resolve to ensure safe operation of nuclear plants in its safety rules.

“It’s insecure” if Tepco expresses its resolve to ensure safety only in words, Tanaka told a press conference.

Safety rules need to be approved by the regulator and if there is a grave violation the regulator can demand that the utility halt nuclear power operations.

The regulator will formally inform the utility’s president, Tomoaki Kobayakawa, about the matter on Sept. 20. A final decision on whether Tepco is fit to be an operator will be made following discussions with the economy, trade and industry minister.

If Tepco agrees to include its resolve to ensure safety in its safety rules, the regulator will compile a draft document for the Nos. 6 and 7 reactors at Tepco’s Kashiwazaki-Kariwa plant in Niigata Prefecture that will serve as certification that the utility has satisfied new safety requirements implemented since the 2011 Fukushima nuclear disaster.

The regulator had been expected at Wednesday’s meeting to confirm that the units have cleared the new safety requirements, but it reversed course after facing criticism over a lack of debate on whether the operator is fit to run a nuclear power plant.

For a reactor to be restarted, it first needs to clear the stiffer safety requirements introduced in the wake of the Fukushima nuclear crisis, which was triggered by a massive earthquake and tsunami on March 11, 2011. Tepco filed for safety assessments of the two units in September 2013.

According to sources close to the matter, the regulator had planned to give safety clearance while Tanaka was still on the board. Tanaka’s term expires on Sept. 18, although he will continue to work until Sept. 22.

The regulator had reached a near consensus on the issue of Tepco’s qualification when its members previously met on Sept. 6.

During the summer, the regulator questioned the Tepco management, including Kobayakawa, about its nuclear safety awareness. In July, Tanaka criticized Tepco’s attitude, saying, “An operator, which cannot take concrete measures for decommissioning efforts at the Fukushima Daiichi power plant, does not have the right to resume operation of nuclear reactors.”

Tanaka urged the utility to further explain in writing issues such as how to deal with contaminated water at the Fukushima plant.

While Tepco, in its subsequent written response, did not give details about what it would do regarding the contaminated water, it did pledge to see through the scrapping of the plant, gaining a certain level of understanding from the regulator.

Meanwhile, the prospect of gaining local consent needed for the restart of the two reactors remains uncertain, with Niigata Gov. Ryuichi Yoneyama saying it will take “around three to four years” for the utility to win local consent for the envisioned restart.

http://mainichi.jp/english/articles/20170914/p2g/00m/0dm/006000c

 

 

September 15, 2017 Posted by | Japan | , , | Leave a comment