ML15002A046

Requests for Additional Information for the Review of the Fermi 2 License Renewal Application - Set 20

ML15002A046
Person / Time
Site:	Fermi
Issue date:	01/20/2015
From:	Melendez-Colon D License Renewal Projects Branch 1
To:	Kaminskas V DTE Electric Company
Melendez-Colon D, NRR/DLR, 301-415-3301
References
TAC MF4222
Download: ML15002A046 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 20, 2015 Mr. Vito Kaminskas Site Vice President - Nuclear Generation DTE Electric Company Fermi 2 - 280 OBA 6400 North Dixie Highway Newport, MI 48166

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE FERMI 2 LICENSE RENEWAL APPLICATION - SET 20 (TAC NO. MF4222)

Dear Mr. Kaminskas:

By letter dated April 24, 2014, DTE Electric Company submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew the operating license NPF-43 for Fermi 2, for review by the U.S. Nuclear Regulatory Commission (NRC or the staff). The staff is reviewing the information contained in the license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review.

This request for additional information was discussed with Ms. Lynne Goodman, and a mutually agreeable date for the response is within 45 days from the date of this letter. If you have any questions, please contact me at 301-415-3301 or by e-mail at Daneira.Melendez-Colon@nrc.gov.

Sincerely,

/RA/

Daneira Meléndez-Colón, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-341

Enclosure:

Requests for Additional Information cc w/encl: Listserv

ML15002A046

• Concurred via e-mail OFFICE LA:RPB2:DLR* PM:RPB1:DLR PM:RPB1:DLR BC:RPB1:DLR PM:RPB1:DLR NAME IBetts DMeléndez-Colón JDaily YDíaz-Sanabria DMeléndez-Colón DATE 1/6/15 1/13/15 1/15/15 1/19/15 1/20/15

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE FERMI 2, LICENSE RENEWAL APPLICATION - SET 20 (TAC NO. MF4222)

DISTRIBUTION:

E-MAIL:

PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRerb Resource RidsNrrDlrRarb Resource RidsNrrDlrRasb Resource RidsNrrDlrRsrg Resource RidsNrrPMFermi2 Resource D. Melendez-Colon Y. Diaz-Sanabria M. Wentzel B. Wittick D. McIntyre, OPA B. Harris, OGC D. Roth, OGC M. Kunowski, RIII B. Kemker, RIII V. Mitlyng, RIII P. Chandrathil, RIII A. Stone, RIII S. Sheldon, RIII C. Lipa, RIII

ENCLOSURE FERMI 2 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION - SET 20 (TAC NO. MF4222)

RAI 4.7.1-1

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Background===

License Renewal Application (LRA) Section 4.7.1 describes the applicants time-limited aging analysis evaluation for erosion of the main steam line flow restrictors. The LRA states that Updated Final Safety Analysis Report (UFSAR) Section 5.5.4.4 summarizes the existing analysis. Per the UFSAR, it was postulated that even with an erosion rate of 0.004 inches per year, the increase in choked flow through the restrictors after 40 years of operation would be no more than 5 percent. The LRA states that the applicant re-evaluated this erosion rate and established a new rate for the period of extended operation. Based on re-calculating the analysis with the new erosion rate and a time frame of 60 years, the LRA states that the increase in choked flow will remain within the 5 percent limit specified in the UFSAR.

Issue The LRA does not provide the new erosion rate, nor does it describe how this rate was calculated. The LRA also does not describe how the choked flow rate was calculated or quantify by how much it will increase as a result of re-calculating the analysis. As such, the LRA does not provide sufficient information to demonstrate that the increase in the choked flow rate will remain less than the 5 percent limit identified in UFSAR Section 5.5.4.4. Considering these issues, the LRA does not satisfactorily demonstrate that the existing analysis has been projected to the end of the period of extended operation pursuant to 10 CFR 54.21(c)(1)(ii).

Request (a) Quantify the new erosion rate and describe and justify the methodology that was used to calculate it. As part of the response, indicate whether wall thickness measurements of all the Fermi 2 main steam line flow restrictors were considered in the determination of the new erosion rate. If such measurements were taken, provide the results in terms of the date of measurement and the amount of wall loss. Provide justification if such measurements were not considered in the determination of the new erosion rate.

(b) Quantify the increase in the choked flow rate that was determined as a result of re-calculating the analysis using the new erosion rate and a time frame of 60 years. Indicate whether the methodology used for this calculation is the same as the methodology used in the existing analysis. Provide justification if the methodology is different.