ML19276F242

NRC Regulatory Guide on Volcanic Hazards Assessment Working Outline

ML19276F242
Person / Time
Issue date:	10/21/2019
From:	Jacqueline Thompson NRC/NRO/DLSE
To:
Thompson J 415-1811
Shared Package
ML19276F199	List: ML19269D798 ML19276F242 ML19276F244
References
Download: ML19276F242 (2)

Text

NRC REGULATORY GUIDE ON VOLCANIC HAZARDS ASSESSMENT WORKING OUTLINE October 21, 2019

1) INTRODUCTION a) Purpose i) The NRC staff is preparing this Regulatory Guidance (RG) to provide clarifying guidance to facilitate staff review and understanding of volcanic hazards assessments that are used to support siting of new power reactors licensed under 10 CFR Part 50 or 10 CFR Part 52.

b) Applicability i) Applicable to all applicants for new power reactors c) Applicable Orders and Regulations i) 10 CFR Part 100.23(c), 10 CFR Part 50, Appendix A, Criterion 2(1),

10 CFR Part 52.17(a)(1)(vi), and 10 CFR Part 52.79(a)(1)(iii) d) Related Guidance i) (None) e) Purpose of Regulatory Guides f) Paperwork Reduction Act g) Public Protection Notification

2) DISCUSSION a) Reason for Issuance i) Although volcanic hazards exist only in certain areas of the USA, some potential nuclear reactors are being considered in areas that have experienced direct volcanic disruption in the past. The guidance in this RG develops a risk-informed framework for the consideration of volcanic hazards, which the NRC staff finds acceptable for use in licensing Part 50/52 facilities.

b)

Background:

i) Overview of volcanic hazards ii) Rationale for the Period of Interest iii) Rationale for the Regions of Interest iv) Discussion on the use of SSHAC study guidelines v) Proposed Volcanic Hazards Analysis (VHA) approach (1) Initial Characterization (2) Screening of Volcanic Hazards (3) Initial Risk Insights (4) Evaluate Eruption Potential and/or Hazard Potential (5) Detailed Risk Insights (6) Evaluate Design Bases (7) Evaluate Mitigating Strategies c) Harmonization with International Standards:

i) General consistency with existing standard IAEA SSG-21 ii) ANS 2.34 is under development, but no draft released d) Documents Discussed in Staff Regulatory Guidance

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3) STAFF REGULATORY GUIDANCE a) Period of Interest b) Regions of Interest i) Volcanic ash falls potentially different from surface flow hazards?

c) Tectono-magmatic model d) Deterministic Screening of Volcanic Hazards e) Initial Risk Insights f) Evaluate Probability of Eruption and/or Hazard g) Detailed Risk Insights h) Evaluate Design Basis i) Evaluate Mitigation Strategies j) Siting Decision

4) IMPLEMENTATIONS a) Use by Applicant and Licensees b) Use by NRC Staff ADAMS Package Accession Number: ML19276F199 ADAMS Accession Number: ML19276F242