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TEPCO conducts test to halt water injection into crippled reactor

13 may 2019.jpgThis March 11, 2019 photo, taken from Futaba, Fukushima Prefecture, shows the Fukushima Daiichi nuclear power plant, which was struck by the 2011 earthquake-tsunami disaster in northeastern Japan and is in the process of being decommissioned.

May 13, 2019
FUKUSHIMA, Japan (Kyodo) — The operator of the Fukushima Daiichi nuclear power plant on Monday conducted a test to temporarily halt the water being injected into one of the reactors that suffered a core meltdown in the wake of the 2011 accident
Through the test, which is the first of its kind, Tokyo Electric Power Company Holdings Inc. plans to obtain data on how the temperature inside the No. 2 reactor could rise in the event of an emergency and use the input to update its response.
More than eight years on from the start of what has become one of the world’s worst nuclear crises, TEPCO continues to pour water inside the Nos. 1 to 3 reactors to keep the melted fuel debris inside them cool.
At 10:40 a.m. Monday, TEPCO completely halted the water injection into the No. 2 unit, which usually receives around 3 tons of coolant per hour.
The temperature at the bottom of the reactor pressure vessel, a container that is supposed to hold the fuel, stood at about 24.5 C and TEPCO expects the reading to rise by up to 4 C following the 7-hour test.
Hit by a magnitude 9.0 earthquake and ensuing tsunami on March 11, 2011, the Fukushima nuclear complex lost nearly all its power sources and consequently the ability to cool the reactors and spent fuel pools at the Nos. 1 to 4 units.
The conditions of the reactors are now kept relatively stable through recovery efforts, but a massive amount of contaminated water has accumulated at the plant as a result.
https://mainichi.jp/english/articles/20190513/p2g/00m/0dm/071000c

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May 15, 2019 Posted by | fukushima 2019 | , , | Leave a comment

TEPCO to slice dangerous chimney at Fukushima plant

chimney reactors 1 & 2 10 may 2019.jpgA chimney for both the No. 1 and No. 2 reactors remains unrepaired at the Fukushima No. 1 nuclear power plant. At left is the No. 1 reactor building.

May 10, 2019
Tokyo Electric Power Co. plans to start work on May 20 to dismantle a 120-meter-tall, highly contaminated chimney that could collapse at the crippled Fukushima No. 1 nuclear power plant.
It will be the first highly radiated facility at the plant to be taken apart, the company said May 9.
The stack, with a diameter of 3.2 meters, was used for both the No. 1 and No. 2 reactors. TEPCO plans to remove the upper half of the chimney within this year to prevent the structure from collapsing.
The dismantling work will be conducted by remote control because the radiation level around the base of the chimney is the highest among all outdoor areas of the plant. Exposure to radiation at the base can cause death in several hours.
After the Great East Japan Earthquake and tsunami struck in March 2011, pressure increased in the containment vessel of the No. 1 reactor. Vapors with radioactive substances were sent through the chimney to the outside.
TEPCO also found fractures in steel poles supporting the chimney. The damage was likely caused by a hydrogen explosion at the No. 1 reactor building when the nuclear disaster was unfolding.
Since then, the chimney has been left unrepaired because of the high radiation levels.
Immediately after the nuclear accident, a radiation level exceeding 10 sieverts per hour was observed around the base of the chimney. In a survey conducted in 2015, a radiation level of 2 sieverts per hour was detected there.
TEPCO will use a large crane that will hold special equipment to cut the chimney in round slices from the top.
The company set up a remote control room in a large remodeled bus about 200 meters from the chimney. Workers will operate the special cutting equipment while watching footage from 160 video cameras.
http://www.asahi.com/ajw/articles/AJ201905100045.html

May 15, 2019 Posted by | fukushima 2019 | , , , | Leave a comment