Panel: Fault under nuclear reactor may have moved — NHK World

” A panel of experts will present a draft of a report on a fault running under a nuclear reactor in central Japan on Friday. Its findings could lead to the possible decommissioning of the reactor.

The panel plans to disclose the draft at a meeting of the Nuclear Regulation Authority, or NRA, on Friday.

The report deals with a fault under the No.1 reactor at the Shika nuclear power plant in Ishikawa Prefecture, operated by Hokuriku Electric Power Company.

It says there is no clear evidence that the fault called S-1 is active. But it also says the strata above the northwestern part of the fault may have moved after a geological period called the Late Pleistocene. That’s between 120,000 and 130,000 years ago.

The experts cite a sketch of the strata drawn before the reactor’s construction as well as simulations involving nearby faults.

The draft says strata believed to have accumulated after the Late Pleistocene period may have slid because of movement in the fault.

Japan’s new regulations ban constructing reactor buildings and other key nuclear plant facilities above a fault that may have moved after the Late Pleistocene period.

The reactor could be scrapped if the expert panel and the NRA determine that the fault could be potentially active. ”

source

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