Daily Rules, Proposed Rules, and Notices of the Federal Government
JLD-ISG-2012-04 is being issued to describe to the public the guidance that is acceptable to the NRC staff for responding to the request to reevaluate seismic hazards at operating reactor sites, as discussed in Enclosure 1, “Recommendation 2.1: Seismic,” of the NRC staff's request for information (RFI), “Request for Information Pursuant to Title 10 of the
The NRC issued the RFI following the NRC staff's evaluation of the earthquake and tsunami, and resulting nuclear accident, at the Fukushima Dai-ichi nuclear power plant in March 2011. Enclosure 1 to the RFI states that if a seismic margins analysis (SMA) is performed at a plant, then the SMA approach that the licensee uses should be in accordance with the NRC-approved approach in NUREG/CR-4334, “An Approach to the Quantification of Seismic Margins in Nuclear Power Plants,” issued in August 1985 (ADAMS Accession No. ML090500182), as enhanced for full-scope plants by NUREG-1407, “Procedural and Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities.” This ISG describes the enhancements to the NRC SMA method that are needed to meet the objectives of the RFI letter. In addition, the ISG presents staff positions on the major elements of the NRC SMA. Finally, the ISG provides updated references to allow use of the more recent advances in methods and guidance.
Numerous public meetings were held to receive stakeholder input on the proposed SMA guidance document prior to its issuance formally for public comment. On September 10, 2012 (77 FR 55510), the NRC requested public comments on draft JLD-ISG-2012-04. The staff received seventeen (17) comments from two (2) stakeholders. The comments were considered, evaluated, and resulted in modifications to the final JLD-ISG-2012-04. The comments and staff responses are contained in “NRC Responses to Public Comments,” for JLD-ISG-2012-04, which can be found in ADAMS at Accession No. ML12290A002.
This ISG does not constitute backfitting as defined in 10 CFR 50.109 (the Backfit Rule) and is not otherwise inconsistent with the issue finality provisions in Part 52, “Licenses, Certifications, and Approvals for Nuclear Power Plants,” of 10 CFR. This ISG provides guidance on an acceptable method for implementing the March 12, 2012, RFI. Applicants and licensees may voluntarily use the guidance in JLD-ISG-2012-04 to comply with the RFI. Methods, analyses, or solutions that differ from those described in this ISG may be deemed acceptable if they provide sufficient basis and information for the NRC staff to verify that the proposed alternative is acceptable.
This interim staff guidance is a rule as designated in the Congressional Review Act (5 U.S.C. 801-808). OMB has found that this is not a major rule in accordance with the Congressional Review Act.
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