ML19291A010
| ML19291A010 | |
| Person / Time | |
|---|---|
| Issue date: | 10/21/2019 |
| From: | Jacqueline Thompson NRC/NRO/DLSE |
| To: | |
| Thompson J 415-1811 | |
| References | |
| ML19276F199 | |
| Download: ML19291A010 (10) | |
Text
Development of a Volcanic Hazards Regulatory Guide Public Meeting October 21, 2019 1
Agenda Time Topic Presenter 1:00 - 1:05 pm Welcome and General Information Dan Mussatti 1:05 - 1:20 pm Overview and Schedule Jenise Thompson 1:20 - 2:00 pm Draft Outline of Proposed Brittain Hill Regulatory Guide 2:00 - 2:15 pm Break 2:15 - 3:15 pm Public Comments and Discussion All 3:15 - 3:30 pm Closing Remarks NRC 2
Purpose
- to share the regulatory bases for developing the RG,
- to explain and solicit feedback on the outline of technical information planned for inclusion in the draft RG.
3
Overview of Regulatory Analysis
- NRC has regulatory requirement to consider potential volcanic hazards (10 CFR Parts 50 and 52, GDC 2, 100.23), but lacks guidance on acceptable approaches
- NRC considered five alternative approaches to develop a method to assess volcanic hazards at proposed nuclear power plant sites
- No action
- Develop and issue guidance
- Endorse existing IAEA safety guide SSG-21
- Endorse ANS 2.34 currently under development
- Review and accept for use a topical report
- Staff determined that the best path forward is to develop a draft Regulatory Guide (RG) with input from interested stakeholders.
4
Regulatory Guide Issuance Process
- NRC staff will write a draft guide (DG) over the coming months and will consider stakeholder feedback received by November 8, 2019
- DG will begin internal review process by late 2019/early 2020
- Formal public comment period expected in late spring/early summer of 2020
- Comment capture email box will remain open and monitored throughout the development of the DG
- DG can be updated based on public comments and initial use of method by prospective applicants
1 INTRODUCTION 1a) Purpose
- 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.
1b) Applicability
- Applicable to all applicants for new power reactors.
1c) Applicable Orders and Regulations
- 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) 1d) Related Guidance (None) 1e) Purpose of Regulatory Guides 1f) Paperwork Reduction Act 1g) Public Protection Notification 6
2 DISCUSSION 2a) Reason for Issuance
- Although volcanic hazards exist only in restricted 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.
2b) 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 2c) Harmonization with International Standards i) General consistency with existing standard IAEA SSG-21 ii) ANS 2.34 under development, but no draft released.
2d) Documents Discussed in Staff Regulatory Guidance 7
3 STAFF REGULATORY GUIDANCE 3a) Period of Interest 3b) Regions of Interest
- Volcanic ash falls potentially different from surface flow hazards?
3c) Tectono-magmatic model 3d) Deterministic Screening of Volcanic Hazards 3e) Initial Risk Insights 3f) Evaluate Probability of Eruption and/or Hazard 3g) Detailed Risk Insights 3h) Evaluate Design Basis 3g) Evaluate Mitigation Strategies 3h) Siting Considerations 8
4 IMPLEMENTATION 4a) Use by Applicant and Licensees 4b) Use by NRC Staff 9
Additional Comments/Questions
- Stakeholder comments can be sent via email to VolcanicHazards-RG@nrc.gov 10