ML14168A565

Request for Additional Information Regarding Fukushima Lessons Learned - Flooding Hazard Reanalysis Report

ML14168A565
Person / Time
Site:	Fermi
Issue date:	06/19/2014
From:	Thomas Wengert Plant Licensing Branch III
To:	Plona J DTE Electric Company
Thomas Wegnert, NRR/DORL 415-4037
References
TAC MF1101
Download: ML14168A565 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 19, 2014 Mr. Joseph H. Plona Senior Vice President and Chief Nuclear Officer DTE Electric Company Fermi 2-210 NOC 6400 North Dixie Highway Newport, Ml 48166

SUBJECT:

FERMI 2- REQUEST FOR ADDITIONAL INFORMATION REGARDING FUKUSHIMA LESSONS LEARNED- FLOODING HAZARD REANALYSIS REPORT (TAC NO. MF1101)

Dear Mr. Plena:

By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 10 of the Code of Federal Regulations, Section 50.54(f)

(hereafter referred to as the 50.54(f) letter). The request was issued as a part of implementing lessons-learned from the accident at the Fukushima Dai-ichi Nuclear Power Plant. Enclosure 2 to the 50.54(f) letter requested licensees to perform a flood hazard reevaluation using present-day methodologies and guidance.

By letter dated March 8, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13070A199), DTE Electric Company (DTE) submitted a response to Enclosure 2, Required Response 2 of the 50.54(f) letter. The NRC staff has determined that additional information is needed to complete its review.

A response to the enclosed request for additional information is needed before the NRC staff can complete the review. This request was discussed with Mr. Sam Hassoun of your staff on June 10, 2014, and it was agreed that DTE would respond by June 27, 2014.

J. Plena Should you have any questions, please contact me at 301-415-4037.

Sincerely, Thomas J. Wengert, Senior Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-341

Enclosure:

Request for Additional Information cc w/encl: Listserv

REQUEST FOR ADDITIONAL INFORMATION (RAI)

FUKUSHIMA LESSONS LEARNED FLOODING HAZARD REEVALUATION REPORT DTE ELECTRIC COMPANY FERMI2 DOCKET NO. 50-341 RAI No.4- Local Intense Precipitation (LIP) Flooding:

On the basis of LIP analysis performed by the licensee, the estimated maximum water surface elevation at the Fermi 2 site is 583.4 ft. resulting from the onsite probable maximum flood. The acceptance criterion for the LIP analysis chosen by the licensee is 583.5 ft. (page 4, calculation 177910.51.1001 RO), which is the elevation of the door sills of Category I structures. The U.S.

Nuclear Regulatory Commission (NRC) staff's review indicates that the licensee may have underestimated the base elevation of onsite cross section B, thus resulting in a water surface elevation that is lower than the licensee's acceptance criterion. The staff's visual observation of the site layout indicates that the base elevation along cross section B mainly varies from 582 ft.

to 583ft. based on the site plot plan survey points and Figure 26 (calculation document 177910.51.1001 RO). The NRC staff requests that the licensee provide additional information regarding the estimation of the base elevation along cross section B and selection of acceptance criterion for the LIP analysis. Specifically, the NRC staff requests the following:

a. Provide a basis to explain how the base elevation (582ft.) along cross section B was selected. If an average base elevation along cross section B is greater than 582ft.,

provide an updated estimate for the maximum water surface elevation. Also, provide the supporting onsite ground surface elevation in native electronic format, if available.

b. Discuss the basis for the acceptance criterion of 583.5 ft. for the LIP analysis.

Enclosure

ML14168A565 *via e-mail dated 06/06/14 OFFICE LPL3-1/PM LPL3-1/LA NRO/DSEA/RH MB/BC* LPL3-1/BC LPL3-1/PM NAME TWengert MHenderson CCook RCarlson (SWall for) TWengert DATE 06/18/14 06/18/14 06/06/14 06/19 /14 06/19/14