ML17240A310

2017/08/15 NRR E-mail Capture - Nine Mile Point MSA and FE RAI

ML17240A310
Person / Time
Site:	Nine Mile Point
Issue date:	08/15/2017
From:	Lauren Gibson Japan Lessons-Learned Division
To:	Distel D J Exelon Corp
References
Download: ML17240A310 (2)

Text

1NRR-PMDAPEm Resource From:Gibson, Lauren Sent:Tuesday, August 15, 2017 3:22 PM To:David.Distel@exeloncorp.com

Subject:

Nine Mile Point MSA and FE RAIDavid, 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 2.1-Flooding 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 (ML17069A 005, 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.

Hearing Identifier: NRR_PMDA Email Number: 3696 Mail Envelope Properties (d9b956fa31fb4b10a537b19b317e92f2)

Subject:

Nine Mile Point MSA and FE RAI Sent Date: 8/15/2017 3:21:41 PM Received Date: 8/15/2017 3:21:41 PM From: Gibson, Lauren Created By: Lauren.Gibson@nrc.gov Recipients: "David.Distel@exeloncorp.com" <David.Distel@exeloncorp.com> Tracking Status: None

Post Office: HQPWMSMRS04.nrc.gov Files Size Date & Time MESSAGE 1519 8/15/2017 3:21:41 PM

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