Earthquake

Industry/Regulatory/Political

  • Japan’s Nuclear Regulation Authority said Monday that its survey of a second fault zone directly beneath one of two reactors at the Tsuruga nuclear energy facility in Fukui prefecture found it likely to be seismically active. NRA Chairman Shunichi Tanaka said that, given the results, “there is no way we can carry out safety assessments for a restart.” The NRA team said reactor 2 may have to be decommissioned by the plant operator, although the agency only has the authority to bar the plant from restarting.

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A 7.3 magnitude earthquake struck Japan overnight, triggering tsunami warnings across the island nation. The warnings were lifted soon after and the quake caused very little damage.

We’ve got out eyes on the situation at Fukushima Daiichi, and things there look quiet according to ABC News: “No damage has been reported at monitoring posts and water treatment facilities at the reactors … All the workers were moved to higher ground on the site and told to stay inside after the tsunami warning.”

The following news article originally appeared in NEI’s Nuclear Energy Overview.

The NRC’s latest analysis of faults near the Diablo Canyon nuclear energy facility in California confirms that the plant’s design could withstand earthquakes near the site, the agency said in a statement.

The NRC’s work is laid out in research information letter (RIL) 12-01, “Confirmatory Analysis of Seismic Hazard at the Diablo Canyon Power Plant from the Shoreline Fault Zone.” The RIL, part of an ongoing effort to better understand earthquake sources near Diablo Canyon, focuses on a recently identified source, the “Shoreline fault” about a kilometer offshore from the plant.
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Industry/Regulatory/Political

  • The post-Fukushima response steering committees of the nuclear energy industry and Nuclear Regulatory Commission reviewed accomplishments and work in progress during a joint meeting last week. Nuclear energy industry representatives highlighted completion of inspections for potential flooding and seismic activity, validation of procedures and equipment readiness for loss of off-site electrical power, purchase of additional portable safety equipment, and selection of a vendor for a regional response center. Work in progress includes establishing guidance and conducting further inspections for flooding and seismic assessments and integrating emergency operating procedures and severe accident management guidelines.
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The following news article originally appeared in NEI’s Nuclear Energy Overview.

NRC staff has issued for public comment draft interim staff guidance for U.S. nuclear energy facility operators reassessing the ability of their plants to withstand earthquakes.

The guidance describes the NRC’s “acceptable method” for licensees to conduct enhanced “seismic margin assessments,” or SMAs, that would meet the requirements of a March 12 request for information the agency issued as part of its response to the Fukushima accident.
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Activity ID: 1002943 Activity Name: NEI Remarketing Safety Activity Group Name: Remarketing Safety First