ML18323A031

October 4-6, 2018 Summary of Report 657th Advisory Committee on Reactor Safeguards Meeting

ML18323A031
Person / Time
Issue date:	11/19/2018
From:	Michael Corradini Advisory Committee on Reactor Safeguards
To:	Kristine Svinicki NRC/CHAIRMAN
Banks M
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ML18324A754	List: ML18323A031
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Download: ML18323A031 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON, DC 20555 - 0001 November 19, 2018 The Honorable Kristine L. Svinicki Chairman U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

SUMMARY

REPORT - 657th MEETING OF THE ADVISORY COMMITTEE ON REACTOR SAFEGUARDS, OCTOBER 4-5, 2018

Dear Chairman:

During its 657th meeting, October 4-5, 2018, the Advisory Committee on Reactor Safeguards (ACRS) discussed several matters and completed the following report and memoranda:

REPORT Report to Kristine L. Svinicki, Chairman, NRC, from Michael L. Corradini, Chairman, ACRS:

• Draft Proposed Rule, Emergency Preparedness for Small Modular Reactors and Other New Technologies, dated October 19, 2018 MEMORANDA Memoranda to Margaret M. Doane, Executive Director for Operations, NRC, from Andrea D. Veil, Executive Director, ACRS:

• Documentation of Receipt of Applicable Official NRC Notices to the Advisory Committee on Reactor Safeguards for October 2018, dated October 24, 2018

2

• Regulatory Guides, dated October 24, 2018 o RG 3.54, Revision 2, Spent Fuel Heat Generation in an Independent Spent Fuel Storage Installation (No Review) o DG 1328, Seismic Qualification of Electrical and Active Mechanical Equipment and Functional Qualification of Active Mechanical Equipment for Nuclear Power Plants (No review; however, the Committee would like an opportunity to review after the public comment period) o DG 1283, Safety-Related Concrete Structures for Nuclear Power Plants (Other Than Reactor Vessels and Containments) (No review; however, the Committee would like an opportunity to review after the public comment period) o DG-1284, Anchoring Components and Structural Supports in Concrete (No review; however, the Committee would like an opportunity to review after the public comment period)

HIGHLIGHTS OF KEY ISSUES

1. Draft Rule on Emergency Preparedness for Small Modular Reactors The Committee met with representatives of the NRC staff and other stakeholders to review the draft proposed rule, Emergency Preparedness for Small Modular Reactors and Other New Technologies, and the associated draft regulatory guide, DG-1350. We reviewed the draft rule, its associated guidance, and references. The draft rule is straightforward. It replicates most of what is included in 10 CFR 50.47 and Appendix E. There are two significant changes: the organization of emergency plan requirements and new alternative emergency planning zone guidance and requirements. The requirements for the emergency plan have been rearranged in a more logical order to suggest priorities, include lessons learned in applying the existing rules, and modify requirements to be performance-based rather than prescriptive. The changes to the emergency planning zone requirement are significant and the main purpose of the new rule. The new alternative emergency preparedness requirements and guidance would adopt a variable plume exposure pathway emergency planning zone approach and address ingestion response planning.

Application of the rule will require determination of release scenarios and source terms for possible accidents, but the guidance in DG-1350 is meager on this issue. Developing mechanistic source terms is not an easy task for this application and other regulatory activities. It involves complex physics and chemical phenomena including the evolution and transport of aerosols. The staff should provide guidance to evaluate the adequacy of the frequency of events considered and the duration over which such events must be analyzed.

While we see no reason to delay the rulemaking, it is important for the staff to provide guidance on how source terms should be developed.

3 Committee Action The Committee issued a report to the NRC Chairman on this matter, dated October 19, 2018, with the following conclusion and recommendation: 1) We find no technical obstacles at this time to the rulemaking and recommend that it move forward, and 2) For the rule to be applied effectively, the staff will also need to provide guidance to define their expectations for the technical adequacy of mechanistic source terms.

SCHEDULED TOPICS FOR THE 658th ACRS MEETING The following topics are scheduled for the 658th ACRS meeting, to be held November 1-3, 2018:

• Waterford Steam Electric Station, Unit 3 License Renewal Application

• River Bend Nuclear Generating Station, Unit 1 License Renewal Application Sincerely,

/RA/

Michael Corradini Chairman

4 November 19, 2018

SUMMARY

REPORT - 657th MEETING OF THE ADVISORY COMMITTEE ON REACTOR SAFEGUARDS, OCTOBER 4-5, 2018 Accession No: ML18323A031 Publicly Available (Y/N): _Y___ Sensitive (Y/N): N If Sensitive, which category?

Viewing Rights: NRC Users or ACRS only or See restricted distribution OFFICE ACRS SUNSI Review ACRS ACRS NAME MBanks MBanks AVeil MCorradini (AVeil for)

DATE 11/ 16 /18 11 /16/18 11/ 17 /18 11/ 17 /18 OFFICIAL RECORD COPY