ML18067A282
| ML18067A282 | |
| Person / Time | |
|---|---|
| Issue date: | 03/19/2018 |
| From: | Mccree V NRC/EDO |
| To: | Michael Corradini Advisory Committee on Reactor Safeguards |
| Reckley W | |
| Shared Package | |
| ML18054B384 | List: |
| References | |
| LTR-18-0067-1 | |
| Download: ML18067A282 (3) | |
Text
March 19, 2018 Dr. Michael L. Corradini, Chairman Advisory Committee on Reactor Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
RESPONSE TO THE ADVISORY COMMITTEE ON REACTOR SAFEGUARDS LETTER, DATED FEBRUARY 21, 2018, ON NUSCALE POWER EXEMPTION REQUEST FROM GENERAL DESIGN CRITERION 27, COMBINED REACTIVITY CONTROL SYSTEM CAPABILITY
Dear Dr. Corradini:
I am responding to your letter dated February 21, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18052A532), in which you provided comments from the Advisory Committee on Reactor Safeguards (ACRS or Committee) on the draft Commission paper, NuScale Power Exemption Request from Title 10 of the Code of Federal Regulations Part 50, Appendix A, General Design Criterion 27, Combined Reactivity Control Systems Capability (ADAMS Accession No. ML17339A773). The ACRS offered the following conclusion and recommendation related to the U.S. Nuclear Regulatory Commission (NRC) staffs proposed approach and criteria for evaluating the exemption request:
The proposed criteria, which the staff will use to determine the acceptability of NuScales GDC 27 exemption request, are reasonable provided the following recommendations and enhancements outlined in this letter report are addressed:
- 1. Evaluate the overall risk and not just the frequency of the challenge.
- 2. Risk considerations should be based on the facility rather than an individual module.
The NRC staff appreciates the insights provided by the ACRS in the letter and has revised the Commission paper to address the recommendations. The revised paper includes an added criterion to ensure that the applicants analyses and related NRC staff assessments of the design certification application include a confirmation that the design basis event scenarios involving recriticality do not contribute significantly to the overall risks associated with the proposed multi-module facility.
M. Corradini 2
The NRC staff appreciates ACRSs efforts on this matter. We thank the ACRS for its valuable input and look forward to working with the Committee in the future.
Sincerely,
/RA/
Victor M. McCree Executive Director for Operations cc: Chairman Svinicki Commissioner Baran Commissioner Burns SECY
M. Corradini 3
SUBJECT:
RESPONSE TO THE ADVISORY COMMITTEE ON REACTOR SAFEGUARDS LETTER, DATED FEBRUARY 21, 2018, ON NUSCALE POWER EXEMPTION REQUEST FROM GENERAL DESIGN CRITERION 27, COMBINED REACTIVITY CONTROL SYSTEM CAPABILITY DATED MARCH 19, 2018.
DISTRIBUTION: LTR-18-0067-1 PUBLIC ARPB/ RF RidsACRS_MailCTR RidsSecyMailCenter RidsNroMailCenter RidsOgcMailCenter RidsNroOd RidsNroDsra RidsNroDnrl RidsOpaMailCenter RidsOcaMailCenter ADAMS Accession Number: ML18054B384 (Pkg) *via email EDO-002 OFFICE NRO/DSRA:PM NRO/DSRA:BC NRO/DSRA:D NRO/DNRL:D NAME WReckley RKaras JMonninger FAkstulewicz DATE 03/8/2018 03/12/2018 03/12/2018 03/12/2018 OFFICE Tech Ed*
NRO:D EDO NAME JDougherty FBrown VMcCree DATE 03/12/2018 03/14/2018 03/19/2018 OFFICAL RECORD COPY