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Nuclear power plant shut down by host of tiny shrimp clogging filters

Masses of tiny shrimp shut down nuclear power plant in southern China twice in one week, 1 Apr 2020,The Star, By Holly Chik  The Power-Generating Units Of A Nuclear Plant In Southern China Were Shut Down Twice Last Week After Its Water Filters Were Blocked By Masses Of Small Shrimp, The Safety Regulator Said.

Big shoals of the tiny acetes – krill-like shrimp that are just a few centimetres long – flooded the seawater diversion channel and circulating water pumping stations of the Yangjiang Nuclear Power Station in Guangdong on March 24, the National Nuclear Safety Administration said in a statement.

They crippled the water pumping stations and caused one of the nuclear plant’s six power-generating units to go into automatic safe shutdown, while the other five units ran at 80 per cent of capacity.  The unit that shut down was powered up again the next day after station staff cleared the acetes and cleaned the filters.

But soon after on March 25, the same thing happened, with large shoals of acetes again finding their way into the pumping stations and causing four power-generating units to shut down automatically. The station shut off the other two units for safety reasons. …….

The Hong Kong Nuclear Society also noted that similar incidents had happened before.

“Similar events have occurred at nuclear power plants using seawater as a coolant for their power-generating units [including non-nuclear ones] throughout the world, including China,” said Luk Bing-lam, chairman of the society.

In 2016, a generating unit at the Lingao Nuclear Power Plant in Shenzhen was guided to a safe shutdown by an automatic reactor protection signal after its seawater intake was inundated with tiny marine crustaceans, according to Hong Kong’s Security Bureau. They blocked the filtering screen drum at the intake and tripped two seawater intake pumps. …….


April 4, 2020 - Posted by | China, environment

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