NISA releases safety plan for Fukushima plant after cold shutdown – Concern that ‘Cold Shutdown’ Tepco Boasts is Temporary and Unstable

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The Nuclear and Industrial Safety Agency (NISA) for the first time presented a plan to secure the safety of the reactors at the Fukushima No. 1 nuclear power plant after cold shutdown is achieved.

In the plan released by NISA officials on Oct. 3, four major objectives were laid out: limiting and managing the emission of radioactive materials; removing decay heat from the nuclear fuel; preventing criticality in which a nuclear chain reaction continues; and preventing hydrogen explosions.

The agency included 57 measures that must be implemented to achieve those objectives, covering such areas as cooling the reactors and fuel storage pools while maintaining stable operations of purification equipment processing water contaminated with high levels of radiation.

A major reason for the plan is that many current facilities being used to achieve cold shutdown are temporary ones, raising concerns about whether a state of cold shutdown can be continued in a stable manner.

Under the government’s road map to settle the Fukushima nuclear accident, the target date for achieving cold shutdown, in which temperatures in the reactors are under 100 degrees and no radioactive materials are being emitted, is next January. That would mark the conclusion of the second step of the road map.

“There will be a need for an appraisal of the TEPCO report that can reassure the public,” Goshi Hosono, the state minister in charge of the Fukushima nuclear accident, said at an Oct. 3 news conference.

NISA’s plan also includes steps to be taken when removing nuclear fuel from the storage pools as well as installing a temporary fuel storage facility. Such measures are needed because the nuclear fuel rods are believed to have been damaged.

Source:, via Nuclear News | What The Physics?
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