Spent fuel pool emergency cooling test 'satisfactory'

31 January 2012

TEPCO workers have 'satisfactorily' completed a drill setting up alternative cooling arrangements for a Fukushima Daiichi spent fuel pool, performing tasks such as laying pipes and starting up portable pumps.

Fukushima Daiichi spent fuel pool cooling drill
Fukushima Daiichi spent fuel pool cooling drill

The drill postulated a simultaneous loss of spent fuel pool circulating cooling systems and an inability to recover them, for example because of another tsunami. Site technical standards that have been recently adopted by the government stipulate this annual drill.

Water decontamination apparatus at the Fukushima Daiichi site has been hit by a series of leaks probably caused by water freezing. These sites included a valve flange around the evaporation concentration apparatus demineralizer, a vent valve around a standby reactor injection pump, and a valve flange of mini-flow piping of waste RO supply pump.

The site has experienced severe winter cold, with site temperatures dipping below -10°C (14°F). Although measures were taken to protect exposed points from freezing, these will be supplemented with the construction of sheds, heaters and other protection measures by Wednesday 1 February.

Although some of the photographs show relatively small leaks, the water for treatment is highly radioactive.

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