ML17241A274

Request for Additional Information Response MSA (MF7946,7) and FE (MG0087,8) E-mail

ML17241A274
Person / Time
Site:	Nine Mile Point
Issue date:	08/29/2017
From:	Distel D Niagara Mohawk Power Corp
To:	Lauren Gibson Japan Lessons-Learned Division
Gibson L, NRR/JLD, 415-1056
Shared Package
ML17241A270	List: ML17241A274 ML17241A275
References
CAC MF7946, CAC MF7947
Download: ML17241A274 (1)

Text

From: Distel, David J:(GenCo-Nuc)

To: Gibson, Lauren Cc: Uribe, Juan; Aggarwal, Vinod K:(GenCo-Nuc); Joe Bellini; Corcoran, Robert W:(GenCo-Nuc); Lanka, Bradley Franklin F:(GenCo-Nuc)

Subject:

[External_Sender] RE: Nine Mile Point MSA and FE RAI Date: Tuesday, August 29, 2017 1:51:04 PM Attachments: NMP MSA August 2017 RAI Response.pdf Lauren - Attached is the Exelon response to the NRC audit review RAI regarding the Nine Mile Point Flood Hazard MSA and FE.

Please let me know if any additional information is needed.

Thanks.

Dave Distel From: Gibson, Lauren [1]

Sent: Tuesday, August 15, 2017 3:22 PM To: Distel, David J:(GenCo-Nuc)

Subject:

[EXTERNAL] Nine Mile Point MSA and FE RAI

David, Please see the RAI below. I understand that you will submit the response as an e-mail and I will add it to ADAMS. Give me a call if you have any questions.

Thank you, Lauren Lauren K. Gibson Project Manager Hazard Managemenr Branch Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission (301) 415-1056 Request for Additional Information Nine Mile Point Nuclear Station, Units 1 and 2 Mitigating Strategies Assessment and Focused Evaluation NTTF Recommendation 2.1Flooding As discussed in the audit call on August 15, 32017, the NRC notes that there are

differences in the way that the warning time is addressed between the Mitigating Strategies Assessment (ML16349A029; dated December 14, 2016) and the Focused Evaluation (ML17069A005, dated March 10, 2017) for Nine Mile Point Nuclear Station. In particular, the FE contains commitments to further evaluate the consequential rainfall estimate and meteorological assessments in order to determine if the monitoring threshold should be adjusted or if the flood protection strategies should be modified. Please explain the evolution of the approach and how it impacts the Mitigating Strategies Assessment. Given that the FE mentions the possibility of warning times that may be less than the 6.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> previously determined for installing the flood barriers, please provide a justification for the plant being protected during such time as the analyses and related commitments are being completed.

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