Chubu Electric Hamaoka Nuclear Plant Earthquake Data Manipulation Widened, Investigation Committee Report Finds

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In the misconduct case involving seismic assumption data at Chubu Electric's Hamaoka nuclear plant, a report by an investigation committee of outside lawyers has revealed how the inappropriate manipulation of data used to formulate design-basis earthquake ground motions gradually expanded. When the company applied to the Nuclear Regulation Authority in 2014 and 2015 for the safety review of Hamaoka Units 3 and 4, it set the design-basis ground motion at a maximum of 1,200 gal. According to the report, the company initially adopted a method of creating 20 sets of randomly generated seismic waves and selecting the one closest to the average as the representative wave, but when the review process called for additional faults to be taken into account, it switched from 2018 onward to a method of arbitrarily selecting the representative wave in order to avoid undesirable representative waves that exceeded assumptions. The report pointed to the motive as wanting to avoid a situation in which seismic ground motions far exceeded assumptions and, in some cases, required construction work that would hinder its target for restarting the reactors. In 2019, the department in charge of seismic assumptions showed trial calculations to the department in charge of seismic design and sought its opinion, and when problems were pointed out, it sometimes redid the calculations and selected a different representative wave candidate. The inappropriate manipulation also occurred in dealings inside and outside the company: at review meetings of the Nuclear Regulation Authority, it fabricated and submitted data after the fact claiming the selection had been made by the method it had described, and in response to a 2021 internal report it likewise created additional data. Even after the Nuclear Regulation Authority began an investigation last May following an external tip-off, the misconduct continued, with the company creating data designed to make it appear that appropriate methods had been used.

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Investigation report found Chubu Electric manipulated seismic design-basis ground motion data in its Hamaoka nuclear plant safety review applications, risking regulatory penalties and restart delays.

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