ML15093A311

NRR E-mail Capture - Request for Additional Information: Clinton Flooding Hazard Reevaluation Report

ML15093A311
Person / Time
Site:	Clinton
Issue date:	03/16/2015
From:	Victor Hall Japan Lessons-Learned Division
To:	Distel D Exelon Corp
References
TAC MF3654
Download: ML15093A311 (3)

Text

NRR-PMDAPEm Resource From: Hall, Victor Sent: Monday, March 16, 2015 4:28 PM To: david.distel@exeloncorp.com Cc: Whaley, Sheena; Purnell, Blake

Subject:

Request for Additional Information: Clinton Flooding Hazard Reevaluation Report (TAC No.

MF3654)

Attachments: Clinton RAI Rev1.docx Mr. Distel, By letter dated March 12, 2014, Exelon Generation Company LLC (the licensee) submitted its flood hazard reevaluation report (FHRR) for Clinton Power Station, Unit No. 1 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14079A419). By e mail dated June 18, 2014, the U.S.

Nuclear Regulatory Commission (NRC) staff provided a Request for Additional Information (RAI) regarding the above referenced FHRR (ADAMS Accession No. ML14169A545). The licensee responded to this RAI by letter dated November 3, 2014 (RS-14-312).

The staff determined that the attached RAI is necessary to complete its assessment of the licensees FHRR.

Please contact me if you would like clarification on the attached RAI. If no clarification is necessary, the NRC requests that Exelon provide a response, or a schedule to provide a response, within 30 days of this e-mail.

The NRC staff has determined that no security-related or proprietary information is contained herein.

Thank you,

-Vic Victor Hall Senior Project Manager Japan Lessons Learned Division Office of Nuclear Reactor Regulation 301-415-2915 1

Hearing Identifier: NRR_PMDA Email Number: 1968 Mail Envelope Properties (Victor.Hall@nrc.gov20150316162700)

Subject:

Request for Additional Information: Clinton Flooding Hazard Reevaluation Report (TAC No. MF3654)

Sent Date: 3/16/2015 4:27:52 PM Received Date: 3/16/2015 4:27:00 PM From: Hall, Victor Created By: Victor.Hall@nrc.gov Recipients:

"Whaley, Sheena" <Sheena.Whaley@nrc.gov>

Tracking Status: None "Purnell, Blake" <Blake.Purnell@nrc.gov>

Tracking Status: None "david.distel@exeloncorp.com" <david.distel@exeloncorp.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 1177 3/16/2015 4:27:00 PM Clinton RAI Rev1.docx 27920 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

Request for Additional Information Fukushima Lessons Learned Flood Hazard Reevaluation Report Clinton Power Station, Unit No. 1 (TAC No. MF3654)

By letter dated March 12, 2014, Exelon Generation Company LLC(the licensee) submitted its flood hazard reevaluation report (FHRR) for Clinton Power Station, Unit No. 1 (Agencywide Documents Access and Management System (ADAMS) Accession No.ML14079A419). By e-mail dated June 18, 2014, the U.S. Nuclear Regulatory Commission (NRC) staff provided a request for additional information (RAI) regarding the above referenced FHRR (ADAMS Accession No. ML14169A545). The licensee responded to this RAI by letter dated November 3, 2014 (RS-14-312).The staff determined that additional information, as requested below,is necessary to complete its assessment of the licensees FHRR.

RAI: Local Intense Precipitation (LIP) Event Duration and Distribution The FHRR presents a LIP flood reevaluation for a 1-hour, front-loaded probable maximum precipitation (PMP) event using Hydrometeorological Report Nos. 51 and 52. Provide justification that the LIP analysis presented in the FHRR is bounding in terms of warning time, flood depth, and flood duration. This justification can include sensitivity analysis of LIP event duration to consider localized (one square mile) PMP events up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> in duration (e.g., 1-,

6-, 12-, 24-, 48-, 72-hour PMPs) and various rainfall distributions (e.g., center-loaded and others in addition to a front-loaded distribution). The evaluations could identify potentially bounding scenarios with respect to flood height, event duration, and associated effects. Provide electronic versions of any associated modeling input and output files for the sensitivity runs.