ML15240A072
| ML15240A072 | |
| Person / Time | |
|---|---|
| Issue date: | 09/14/2015 |
| From: | Jennifer Davis Japan Lessons-Learned Division |
| To: | Joseph E Pollock Nuclear Energy Institute |
| Reckley, William NRR/JLD 415-7490 | |
| References | |
| Download: ML15240A072 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Joseph E. Pollock, Vice President Nuclear Operations Nuclear Energy Institute 1201 F Street NW, Suite 1100 Washington, DC 20004
Dear Mr. Pollock:
September 14, 2015 The U.S. Nuclear Regulatory Commission (NRC) staff has considered a request from the Nuclear Energy Institute (NEI), on behalf of the nuclear industry, to endorse the NEI white paper HCVS-WP-04, "Missile Evaluation for HCVS Components 30 Feet Above Grade, Revision 0, dated August 18, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15231A491
). The purpose of the white paper is to supplement guidance provided in NEI 13-02, "Industry Guidance for Compliance with Order EA-13-109" (ADAMS Accession No. ML15113B318), regarding reliable hardened containment vent systems (HCVS) capable of performing under severe accident conditions at boiling water reactors with Mark I and Mark II containments.
The NRC staff finds that HCVS-WP-04 provides a reasonable approach to evaluating the threat posed to selected portions of the HCVS by wind-borne missiles.
The white paper relies on a risk-informed approach, including defense-in-depth measures to restore containment venting through the HCVS in the extremely unlikely circumstance of a missile impact to selected portions of the HCVS during a beyond-design-basis external event. Licensees may reference the generic assessment in HCVS-WP-04 in their overall integrated plans (OIPs) related to Order EA-13-109 and the containment venting portions of Order EA-12-049, "Mitigating Strategies for Beyond-Design-Basis External Events." The approach taken and evaluation provided in WP-04 may not be appropriate for resolving issues for safety-related equipment or applications beyond the limited scope of the white paper. When referencing the white paper, licensees should describe in their OIPs how the generic evaluation in HCVS-WP-04 has been used for their facility and confirm that site-specific considerations identified in the white paper have been addressed.
For portions of the HCVS systems not bounded by the generic evaluation in the white paper, the OIPs from individual licensees should provide additional discussion for the affected portions of the HCVS system and describe the protection provided against wind-borne missiles, an evaluation of why such protection is not needed, or any alternative measures that will be undertaken.
J. Pollock If you have any questions, please contact Dr. Rajender Au luck of my staff at (301) 415-1025 or via email at Rajender.Auluck@nrc.gov.
ck R. Davis, Director pan Lessons-Learned Division 0 ice of Nuclear Reactor Regulation J. Pollock If you have any questions, please contact Dr. Rajender Au luck of my staff at (301) 415-1025 or via email at Rajender.Auluck@nrc.gov.
DISTRIBUTION:
PUBLIC JLD R/F RidsNRRLASLent Resource SBailey RDennig RAuluck Sincerely, IRA/ Jack R. Davis, Director Japan Lessons-Learned Division Office of Nuclear Reactor Regulation WReckley GCasto ADAMS Accession No.: ML15240A072 OFFICE NRR/JLD/JPSB/PM NRR/JLD/LA NRR/JLD/JPSB/BC NRR/JLD/JCBB/BC*
NAME RAuluck (WReckley for) SLent GBowman BTitus DATE 09/02/15 09/03/15 09/10/15 09/09/15 OFFICE NRR/JLD/PPSD/AD NRR/JLD/TSD/AD NRR/JLD/D NAME JBowen SBailey JDavis DATE 09/11/15 09/11/15 09/14/15 OFFICIAL RECORD COPY