ML12356A501

Request Additional Information Regarding License Amendment Request for Station Battery Surveillances

ML12356A501
Person / Time
Site:	Saint Lucie
Issue date:	12/31/2012
From:	Orf T Plant Licensing Branch II
To:	Nazar M Florida Power & Light Co
Orf, T J
References
TAC ME9297, TAC ME9298
Download: ML12356A501 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 31,2012 Mr. Mano Nazar Executive Vice President, Nuclear and Chief Nuclear Officer Florida Power and Light Company P.O. Box 14000 Juno Beach, FL 33408-0420

SUBJECT:

ST. LUCIE PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST FOR STATION BATIERY SURVEILLANCES (TAC NOS. ME9297 AND ME9298)

Dear Mr. Nazar:

By letter dated August 10,2012, Florida Power & Light Company submitted a license amendment request for St. Lucie Plant (St. Lucie), Unit Nos. 1 and 2. The proposed amendment would revise the requirements of the St. Lucie 1 and 2, Technical Specifications related to station direct current battery surveillance requirements for terminal connection resistances.

The U.S. Nuclear Regulatory Commission staff is reviewing your submittal and has determined that additional information is needed to complete its review. The specific questions are found in the enclosed request for additional information (RAI). It is requested that your RAI response be provided within 45 days of the date of this letter.

Tracy J. Ort, Project Manager Plant Licensing Branch' 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-335 and 50-389

Enclosure:

Request for Additional Information cc w/enclosure: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION (RAI)

LICENSE AMENDMENT REQUEST REGARDING STATION BATTERY SURVEILLANCES ST. LUCIE, UNIT NOS. 1 AND 2 DOCKET NOS. 50-335 AND 50-389

1. In its letter dated August 10, 2012, the licensee proposed to add resistance value acceptance criteria for "Inter-cell" and "Inter-tier" battery connections in the Technical Specifications (TSs) Table on page 3/4.8-11. However, other types of station battery connections such as station battery terminal connections and associated terminal connection resistance acceptance criteria are not included in the proposed Unit 1 TS Surveillance Requirements (SRs) 4.8.2.3.2.b.2 and 4.8.2.3.2.c.3, and Unit 2 TS SRs 4.8.2.1.b.2, and 4.8.2.1.c.3.

a. Provide a list of all battery connections.

b. Explain why terminal connection resistance was deleted from the existing Unit 1 TS SR 4.8.2.3.2.c.3, and Unit 2 TS SR 4.8.2.1.c.3, and not re-inserted in the proposed TS Table on page 3/4.8-11.

c. Provide a typical drawing of the station battery cell connections arrangement showing all types of station battery connections.

2. Confirm that resistances for all battery connections have been considered in the direct current system calculations for battery sizing and voltage drop.

3. Provide a summary of changes that were made to the station battery sizing calculation to support this license amendment request (LAR).

4. Provide a summary of the calculations including station battery connection resistance calculations that show how the values in the proposed TS Table were derived, battery design duty cycle profiles, assumptions and supporting documentation to demonstrate that:

a. The station batteries will perform their intended safety functions when operating within the proposed limits, and

b. The safe shutdown equipment will have required minimum voltage to perform their required safety functions for the postulated design basis accident and the station blackout scenarios.

5. The licensee proposed to include a new parameter "Average Inter-cell Connection" in the TS Table on page 3/4.8-11. However, the staff did not find any definition or details of this proposed parameter in the LAR. Lack of any definition or details could create confusion in the future.

ENCLOSURE

-2

a. Discuss in detail the proposed parameter "Average Inter-cell Connection" including the definition and provide a Regulatory Commitment to include a definition and details of this new parameter in the TS Bases.

b. On page 15 of the LAR, Attachment 1, TS Table on page 3/4.8-11, the proposed maximum value of "Single Inter-cell Connection" resistance is approximately 300 percent or 100 micro ohms above "Average Inter-cell Connection" resistance. Explain why the "Single Inter-cell Connection" resistance is much higher than the "Average Inter-cell Connection" resistance.

6. With respect to Unit 2 TS Surveillances, there appears to be a discrepancy between the TS SR numbers described in Section 1, "Summary Description," and Section 2, "Detailed Description," of the proposed LAR (page 2 of 20, Enclosure). Confirm the correct TS SR numbers for Unit 2.

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