TEPCO announced that the first-phase assessment of stress tests on the No. 1 and No. 7 reactors at its Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture were to get under way on Sept. 9.
Tokyo Electric Power Co. said at a news conference a day earlier that the Kashiwazaki-Kariwa reactors were the first TEPCO nuclear reactors to undergo such tests.
The first-phase assessment of the safety of nuclear plants is intended for reactors that have been suspended for regular inspections, and is defined as a precondition for restarting them.
The strengths and weaknesses of the reactor containment vessels, pipes and other equipment will be identified under a total of 120 scenarios, each detailing whether different water injection systems work or fail in the event of an earthquake and tsunami.
The regular inspections are expected to be finished in October at the No. 1 reactor and in November at the No. 7 reactor.
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