ML20128E398

Informs That 921222 Response to Staff Concern Re Battery Design Margin for Station Blackout Analysis Acceptable.Tac 68529 Considered Closed

ML20128E398
Person / Time
Site:	Clinton
Issue date:	02/05/1993
From:	Pickett D Office of Nuclear Reactor Regulation
To:	Spangenberg F ILLINOIS POWER CO.
References
TAC-M68529, NUDOCS 9302100419
Download: ML20128E398 (3)

Text

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February 5, 1993~

Dochet No, 50-461-Mr, Frank A. Spangenberg Manager - Licensing.and Safety Clinton Power Station  ;

Post Office Box 678 l Mail Code V920 l Clinton, Illinois 61727-

SUBJECT:

CLIN 10N POWER STATION, UNIT NO. 1 - BATTERY DESIGN MARGIN FOR THE' STATION BLACK 0UT ANALYSIS (TAC NO.- M68529)'

The staff's Supplemental Safety Evaluation (SSE) to the Station Blackout Rule, 10 CCR 50.63, was issued to the Clinton Power Station on October 29,-1992.

One c f the issues discussed was the battery design margin. When_the Clinton facility was designed and built, a battery design margin of 1.1-to 1.15 as endorsed by IEEE Standard 485 was included. However, this margin was_not required.to be maintained and, as loads were added, the design margin has been reduced. This has resulted in the replacement of the Division 1: battery with a larger capacity battery during the third refueling outage-in .1992. In addition, th?re are plans to replace the Division 11 battery in refueling _.

outage five ar six. Due to concerns over reduced battery design margin during the life of the facility, the staff's SSE recommended that Illinois Power commit to maintain a 5% design margin for the Division I, II, and 111 station batteries.

Your letter of December 22, 1992 (U-602081), responded tn the staff's concern.

Rather than maintaining a 5% design margin, Illinois Power committed to analyze the impact of adding new loads to the batteries to ensure that- '

sufficient design margin exists. -

Considering the above commitment and the current Technical Specification requirements that demonstrate continuing operability of the station batteries, the staff finds your response acceptable.

This closes the staff's activities on TAC No. 68529.

Sincerely, Dou b,Sr.ProjectManager Project Directorate 111-2 Division of Reactor Projects III/IV/V Office _ of Nuclear Reactor Regulation cc: See next page plSTRIBUTION dDocket1 File; NRC & Local PDRs PDill-2 r/f i PDIll-2 p/f JRoe JZwolinski JDyer DPickett CMoore ACRS(10) OGC CBerlinger, EELB BClayton, Region III 9302100419 930205 -

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February 5,1993 -

Docket No. 50-461 m Mr. Frank A. Spangenberg r Manager - Licensing and Safety Clinton Power Station Post Office Box 678 Mail Code V920 Clinton, Illinois 61727

SUBJECT:

CLINTON POWER STATION, UNIT NO.1 - BATTERY DESIGN MARGIN FOR THE STATION BLACK 0UT ANALYS!5 (TAC NO. M68529)

The staff's Supplemental Safety Evaluation (SSE) to the Station Blackout Rule, 10 CFR 50.63, was issued to the Clinton Power Station on October 29, 1992.

Cne of the issues discussed was the battery design margin. When the Clin _ ton facility was designed and built, a battery design margin of 1.1 to 1.15 as endorsed by IEEE Standard 485 was included. However, this margin was not required to be maintained and, as loads were added, the design margin has been reduced. This has resulted in the replacement of the Division I battery with a larger capacity battery during the third refceling outage in 1992. In addition, therc are plans to replace the Division 11 battery in refueling outage five or six. Due to concerns over reduced battery design margin during the life of the facility, the staff's SSE recommended that Illinois Power commit to maintain a 5% design margin for the Division I, 11, and 111 station batteries.

Your letter of December 22, 1992 (U-602081), responded to the. staff's concern.

Rather than maintaining a 5% design margin, Illinois Power committed to analyze the impact of adding new loads to the batteries to ensure that sufficient design margin exists.

Considering the above commitment and the current Technical Specification requirements that demonstrate continuing operability of the station batteries, the staff finds your response acceptable.

This closes the staff's activities on TAC No. 68529.

Sincerely, Dou bibeI5,Sr.ProjectManager Project Directorate III-2 Division of Reactor Projects Ill/IV/V-Office of Nuclear Reactor Regulation cc: See next page DJST_RlBUTI0ff Docket File NRC '& Local PDRs PDill-2 r/f PDill-2 p/f JRoe JZwolinski JDyer DPickett CMoore ACRS(10) OGC CBerlinger, EELB BClayton, Region 111 P

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j Hr. Frank A. Spangenberg Clinton Power Station  :

Illinois Power Company Unit No.-1 l l

cc:

l Mr. J. S. Perry Illinois Department E Vice President of Nuclear Safety 1 Clinton Power Station Office of Nuclear facility Safety . 1 Post Office Box 678 - 1035 Outer Park Drive l Clinton, Illinois 61727 Springfield, Illinois 62704 Mr. J. A. Miller- Mr. Donald Schopfer Manager Nucler.r Station Project Manager ,

Engineering Department Sargent & Lundy Engineers-Clinton Power Station 55 East Monroe Street Post Office Box 678 Chicago,fillinois 60603 '

Clinton, Illinois 61727 l- .,

1 l Sheldon Zaael, Esquire Schiff, Hardin & Waite 7200 Sears Y7wer 233 Wacker Drive Ch_icago, Illinois 60606

Resident Inspector U.S. Nuclear Regulatory Commission r RR#3, Box 229 A

! Clinton, Illinois E1727 1

l Ms. K. K. Berry

l. . Licensing Services Manager u

General Electric Company 175 Curtner Avenue, M/C 382 San Jose, California 95125 l . Regional Administrator, Region III L 799 Roosevelt Road, Building 4 >

Glen Ellyn, Illinois 60137 l

-Chairman of DeWitt County

-c/o County Clerk's Office DeWitt County _ Courthouse L Clinton, Illinois 61727 i-i .Mr. Robert Neumann Office of Public Counsel State of Illinois Center 100 W. Randolph,-Suite 11-300--

Chicago, Illinois 60601 l

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