"On Wednesday, Japan's Nuclear Regulation Authority announced that it is halting the relicensing process for two reactors at the Hamaoka plant after revelations that the operator fabricated seismic hazard data. Japan has been slowly reactivating its extensive nuclear power plant collection after it was shut down following the Fukushima Daiichi disaster. The latest scandal is especially shocking, given that the Hamaoka plant is located on the coast near an active subduction fault-just as Fukushima Daiichi is."
"Based on an English translation, it appears that seismic risks were evaluated at least in part by scaling up the ground motion using data from smaller earthquakes. This is an inexact process, so the standard approach is to create a group of 20 different upscaled earthquake motions and find the one that best represents the average among the 20. The company now acknowledges that since 2018, its staff has been generating large collections of upscaled earthquake scenarios, choosing one from among them,"
Japan's Nuclear Regulation Authority halted relicensing for two Hamaoka reactors after the operator fabricated seismic hazard data. Nuclear reactors across Japan have been gradually reactivated following the Fukushima Daiichi shutdown. Regulators were reportedly alerted by a whistleblower in February of last year, which led to a halted evaluation that could have enabled a restart. The Hamaoka plant sits on the coast near an active subduction fault. Chubu Electric acknowledged manipulating seismic safety data by generating and selectively choosing upscaled earthquake scenarios to make risks appear more tolerable, a practice traced back to 2018.
Read at Ars Technica
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