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Watchdog blasts Joyo reactor restart plan as ‘unacceptable’ via Asahi Shimbun

The nation’s nuclear watchdog has slammed the operator of the Joyo experimental fast reactor in Ibaraki Prefecture for its approach to safety concerns in seeking an early restart.

Shunichi Tanaka, chairman of the Nuclear Regulation Authority, on April 26 labeled the Japan Atomic Energy Agency’s proposal to bring the reactor back online as “absolutely unacceptable.”


On April 25, JAEA officials explained that it would be able to restart the reactor faster by limiting the thermal output because that approach would save it time and effort in providing the necessary explanations to municipal authorities.

If the reactor operates with an output of 100,000 kilowatts, only local governments within a 5-kilometer radius of the reactor are required to produce evacuation plans.

However, when operating with an output of 140,000 kilowatts, local entities within a 30-km radius of the reactor are required to come up with evacuation plans.

Using a motorcycle analogy, Tanaka said the JAEA’s plan is tantamount to saying that the operator needs a “license for a 50cc bike as long as it drives a 750cc motorcycle at a speed of 30 kph or under.”

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