0CAN051703, Mitigating Strategies for Flooding
| ML17153A214 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 05/31/2017 |
| From: | Richard Anderson Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17153A295 | List: |
| References | |
| 0CAN051703 | |
| Download: ML17153A214 (4) | |
Text
~Entergy Entergy Operations, Inc.
1448 S.R. 333 Russellville, AR 72802 Tel 479-858-3110 Richard L. Anderson Site Vice President Arkansas nuclear One OCAN051703 May 31, 2017 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852
SUBJECT:
Mitigating Strategies Assessment for Flooding Arkansas Nuclear One - Units 1 and 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6
Dear Sir or Madam:
On March 12, 2012, the NRC issued Reference 1 to request information associated with Near-Term Task Force (NTTF) Recommendation 2_.1 for Flooding. One of the required responses in Reference 1 directed licensees to subillif a Flood Hazard Reevaluation Report (FHRR). Entergy Operations, Inc. (Entergy) submitted the FHRR for Arkansas Nuclear One (ANO) on September 14, 2016 (Reference 2).
Concurrent with the flood hazard reevaluation, Entergy developed and implemented mitigating strategies in accordance with NRC Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events (BDBE;Es). In Reference 3, the NRC affirmed that licensees need to address the reevaluated flooding hazards within their mitigating strategies for BDBEEs, including the reevaluated flood hazards. This requirement was confirmed by the NRC in Reference 4. Guidance for performing the Mitigating Strategies Assessment (MSA) for flooding is contained in Appendix G of Reference 5, endorsed by the NRC in Reference 6. For the purpose of the MSA for flooding and in Reference 4, the NRC termed the reevaluated flood hazard, summarized in Reference 7, as the Mitigating Strategies Flood Hazard Information (MSFHI). Reference 5, Appendix G, describes the MSA I for flooding. In Reference 7, the NRC concluded that the "reevaluated flood hazards information, as summarized in the Enclosure, is suitable for the assessment of mitigating strategies developed in response to Orqer EA-12-049."
. The enclosure to this letter provides the MSA for Flooding Report for ANO. The assessment
- concluded that the existing FLEX strategy can be successfully implemented and deployed as modified for flood causing mechanism local intense precipitation (LIP). Pre-deployment of the FLEX 480 VAC generator and support equipment or raising a section of the primary deployment path are alternatives for the LIP event. Section 2.3.2 of the enclosure describes a commitment to revise ANO's Natural Emergencies Procedures to address an LIP event.
This submittal contains a new regulatory commitment which is provided in the attachment to this letter. Should you have any questions concerning the content of this letter, please contact \\ (\ \D Stephenie Pyle at 479.858.4704. f'l) \
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OCAN051703 Page 2 of 3 I declare under penalty of perjury that the foregoing is true and correct.
Executed on May 31, 2017.
- Sincerely, RLA/nbm
Enclosure:
2017 Mitigating Strategy Assessment for Flooding Documentation Requirements at Arkansas Nuclear One
Attachment:
List of Regulatory Commitments
REFERENCES:
- 1. NRC letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3 of the NTTF Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012 (OCNA031208)
(ML12053A340) .
- 2. Entergy letter to NRC, Flooding Hazard Re-evaluation Report - Required Response for NTTF Recommendation 2.1, Arkansas Nuclear One Units 1and2 Flooding Hazard Re-Evaluation Report, dated September 14, 2016 (OCAN091602) (ML16260A060)
- 3. NRC Memoranda, Staff Requirements- COMSECY-14-0037, Integration of Mitigating Strategies for BDBEEs,and the Reevaluation of Flooding Hazards, dated March 30, 2015 (ML15089A236) .
- 4. NRC Letter, Coordination of Requests for Information Regarding Flooding Hazard Reevaluations and Mitigating Strategies for BDBEEs, dated September 1, 2015 (OCNA091501) (ML15174A257)
- 5. Nuclear Energy Institute (NEI) Report NEI 12-06 [Rev 2], Diverse and Flexible Coping Strategies (FLEX) Implementation Guide, dated December 2015 (ML16005A625)
- 6. U.S. Nuclear Regulatory Commission, JLD-ISG-2012-01, Revision 1, Compliance with Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigating Strategies for BDBEEs, dated January 22, 2016 (ML15357A163)
- 7. NRC Letter to Entergy, Arkansas Nuclear One, Units 1 and 2 - Interim Staff Response to Reevaluated Flood Hazards Submitted in Response to 1O CFR 50. 54(f) Information Request- Flood-Causing Mechanism Reevaluation (GAG Nos. MF8379 and MF8380),
dated December 2, 2016 (OCNA121601) '(ML16327A494)
OCAN051703 Page 3 of 3 cc: Mr. Kriss Kennedy Regional Administrator U. S. Nuclear Regulatory Commission, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 NRG Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 U.S. Nuclear Regulatory Commission Attn: Mr. Thomas J. Wengert MS 08 B1A One White Flint North 11555 Rockville Pike Rockville, MD 20852 Joseph Sebrosky Hazards Management Branch Japan Lessons-Learned Division MS 0-13F15M One White Flint North 11555 Rockville Pike Rockville, MD 20852
Enclosure to OCAN051703 2017 Mitigating Strategy Assessment for Flooding Documentation Requirements at Arkansas Nuclear One