ML14071A459

Required Response 2 to March 12, 2012, Request for Information (Rfi), Enclosure 2, Recommendation 2.1, Flood Hazard Evaluation Report Arkansas Nuclear One - Units 1 and 2

ML14071A459
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/12/2014
From:	Browning J G Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
0CAN031401
Download: ML14071A459 (5)

Text

0CAN031401March 12, 2014U.S. Nuclear Regulatory CommissionATTN: Document Control Desk11555 Rockville PikeRockville, MD 20852

SUBJECT:

Required Response 2 to March 12, 2012, Request for Information (RFI),Enclosure 2, Recommendation 2.1, Flood Hazard Evaluation ReportArkansas Nuclear One - Units 1 and 2 Docket Nos. 50-313 and 50-368License Nos. DPR-51 and NPF-6

REFERENCES:

1. NRC letter to Entergy,RFI Pursuant to Title 10 of the Code ofFederal Regulations 50.54(f) Regarding Recommendations 2.1,2.3, and 9.3 of the Near-Term Task Force (NTTF) Review ofInsights from the Fukushima Dai-ichi Accident

, datedMarch 12, 2012 (0CNA031208) (ML12053A340)2. Entergy letter to NRC,Entergy's Response to NRC RFI Pursuantto 10 CFR 50.54(f) Regarding the Flooding Aspects ofRecommendations 2.1 and 2.3 of the NTTF Review of Insightsfrom the Fukushima Dai-ichi Accident

, dated June 8, 2012 (0CAN061202)3. Entergy letter to NRC,Assistance in Obtaining Information on Dams, dated September 30, 2013 (0CAN091302)4. NRC letter to Entergy,Supplemental Information Related to RFIPursuant toTitle 10 of the Code of Federal Regulations 50.54(f)Regarding Flooding Hazard Reevaluations for Recommendation2.1 of the NTTF Review of Insights fron the Fukushima Dai-ichi Accident, dated March 1, 2013 (0CAN031302 ) (ML13044A561)

Dear Sir or Madam:

On March 12, 2012, the NRC issued Reference 1 requesting information pursuant toTitle 10 of the Code of Federal Regulations 50.54(f). Enclosure 2 of that letter containsspecific requested Information associated with NTTF Recommendation 2.1 for flooding.By Reference 2 Entergy Operations, Inc. (Entergy) committed to submit the flood hazardevaluation for Arkansas Nuclear One (ANO), Units 1 and 2 as a Category 2 site byMarch 12, 2014.Entergy Operations, Inc.

1448 S.R. 333Russellville, AR 72802Tel 479-858-3110Jeremy G. BrowningSite Vice PresidentArkansas Nuclear One 0CAN031401 Page 2 of 3In September 2013 (Reference 3), Entergy requested the assistance of the NRC toobtain information from three Districts of the United States Army Corps of Engineers(USACE) to support the flood hazard reevaluation at ANO. Pursuant to the guidance inReference 4, Entergy is revising its commitment for submittal of the flood hazardreevaluation report to six months after USACE data is received.Reason for the Delay:The NRC recently notified Entergy that the kickoff meeting with the USACE and theNRC is expected to be scheduled in the near future. Receipt of the USACE informationis not expected for several months subsequent to the meeting.

Proposed Schedule:Subsequent to receipt of the USACE information, six months are necessary to: Complete the Dam Failure calculation. Use Dam Failure calculation as input to complete the Combined Effects calculation. Perform anticipated stepwise model refinements (consistent with the hierarchicalhazard assessment approach) to the Probable Maximum Precipitation, ArkansasRiver Probable Maximum Flood (PMF) flow, and Arkansas River PMF elevation calculations. Perform iterations to the Dam Failure and Combined Effects calculations. Complete flood hazard reevaluation report for submittal.Basis for Acceptability: Preliminary results to date based on publicly available information including theUSACE districts and National Inventory of Dams indicate the flood hazard isexpected be bounded by the current design basis flood level. The NRC has previously determined in their March 2012, 50.54(f) letter that thecurrent regulatory approach and the resultant plant capabilities provide confidencethat an accident with consequences similar to the Fukushima accident is unlikely tooccur in the United States. The NRC letter concluded that continued plant operationand the continuation of licensing activities do not pose an imminent risk to publichealth and safety. The events being analyzed in the flooding hazard reevaluation are beyond theplant's design basis (and licensing basis). The reevaluation results do not constitutean operability concern. The reevaluated flooding hazard is a very low probability event. The timeframe ofthe submittal delay is short relative to the probability of occurrence of the flood eventbeing evaluated.

0CAN031401 Page 3 of 3This letter contains a revised regulatory commitment which is identified in theattachment. Should you have any questions concerning the content of this letter, pleasecontact Stephenie Pyle at 479.858.4704.I declare under penalty of perjury that the foregoing is true and correct. Executed onMarch 12, 2014.

Sincerely,Original signed by Jeremy G. Browning JGB/nbm

Attachment:

List of Regulatory Commitmentscc: Mr. Marc L. DapasRegional AdministratorU. S. Nuclear Regulatory Commission, Region IV1600 East Lamar BoulevardArlington, TX 76011-4511NRC Senior Resident Inspector Arkansas Nuclear OneP.O. Box 310London, AR 72847U. S. Nuclear Regulatory CommissionAttn: Mr. Alan WangMS O-88B1One White Flint North11555 Rockville PikeRockville, MD 20852U. S. Nuclear Regulatory CommissionAttn: Mr. Michael OrenakMS O-8G9AOne White Flint North11555 Rockville PikeRockville, MD 20852 Attachment to0CAN031401List of Regulatory Commitments Attachment to 0CAN031401 Page 1 of 1List of Regulatory CommitmentsThe following table identifies those actions committed to by Entergy Operations, Inc. in thisdocument. Any other statements in this submittal are provided for information purposes andare not considered to be regulatory commitments.COMMITMENT TYPE(Check One)

SCHEDULEDCOMPLETIONDATE(If Required)

ONE-TIMEACTIONCONTINUINGCOMPLIANCESubmit Flood Hazard Evaluation Reportto the NRC.

XSix months after receipt ofinformation from theUnited States ArmyCorps of Engineers