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Following the events at the Fukushima Dai-ichi nuclear power plant on March 11, 2011, the NRC established a senior-level agency task force referred to as the Near-Term Task Force (NTTF). The NTTF was tasked with conducting a systematic and methodical review of the NRC regulations and processes and determining if the agency should make additional improvements to those programs in light of the events at Fukushima Dai-ichi. As a result of this review, the NTTF developed a comprehensive set of recommendations, documented in SECY-11-0093, “Near-Term Report and Recommendations for Agency Actions Following the Events in Japan,” dated July 12, 2011 (ADAMS Accession No. ML111861807). These recommendations were enhanced by the NRC staff following interactions with stakeholders. Documentation of the staff's efforts is contained in SECY-11-0124, “Recommended Actions To Be Taken Without Delay From the Near-Term Task Force Report,” dated September 9, 2011, (ADAMS Accession No. ML11245A158), and SECY-11-0137, “Prioritization of Recommended Actions To Be Taken in Response to Fukushima Lessons Learned,” dated October 3, 2011 (ADAMS Accession No. ML11269A204).
As directed by the staff requirements memorandum (SRM) for SECY-11-0093, the NRC staff reviewed the NTTF recommendations within the context of the NRC's existing regulatory framework and considered the various regulatory vehicles available to the NRC to implement the recommendations. The staff's prioritization of the recommendations was established in SECY-11-0124 and SECY-11-0137.
In March 2012, the NRC issued Request for Information Pursuant to Section 50.54(f) of Title 10 of the Code of Federal Regulations (10 CFR), Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident,” hereafter called the “March 12, 2012, 50.54(f) letter.” Enclosure 1 of that letter, “Recommendation 2.1: Seismic,” described the actions related to seismic hazard and risk reassessments to be taken by licensees in response to the letter. Among the actions discussed in Enclosure 1 is an SMA method, which may be appropriate for some plants depending on the outcome of the hazard reassessment phase. Enclosure 1 to the 50.54(f) letter states that the SMA approach should be the NRC SMA approach (e.g.; 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 in NUREG-1407, “Procedural and Submittal Guidance for the Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities,” ADAMS Accession No. ML063550238.
This draft JLD-ISG, “Guidance on Performing a Seismic Margin Assessment in Response to the March 2012, Request for Information Letter,” (ADAMS Accession No. ML12222A327) describes the enhancements to the NRC SMA method described in NUREG/CR-4334 needed to meet the objectives of the March 12, 2012, 50.54(f) letter. It presents staff positions on enhancements to the major elements of the NRC SMA and updates references to allow for use of recent advances in
Licensees may propose other methods for satisfying these requirements. The NRC staff will review such methods and determine their acceptability on a case-by-case basis.
This guidance, at this time, is only intended to be used for an SMA conducted in response to the 50.54(f) letter, and not for other purposes.
The NRC ISG DC/COL-ISG-020, “Seismic Margin Analysis for New Reactors Based on Probabilistic Risk Assessment” (ADAMS Accession No. ML100491233), remains the NRC's current guidance for application to new reactors. The contents of this draft JLD-ISG have no implications for NRC ISG DC/COL-ISG-020, the ASME/ANS PRA standard, or any other document.
The draft JLD-ISG is not a substitute for the requirements in the March 12, 2012, 50.54(f) letter and compliance with the draft JLD-ISG is not required. This draft JLD-ISG is being issued in draft form for public comment to involve the public in developing the regulatory positions.
By this action, the NRC is requesting public comments on draft JLD-ISG-2012-04. This draft JLD-ISG proposes guidance related to requirements contained in the seismic portion of the March 12, 2012, 50.54(f) letter. The NRC staff will make a final determination regarding issuance of the JLD-ISG after it considers any public comments received in response to this request.
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