ML20002D583

Responds to 801230 Request for Addl Info Re NRC Position 040.15E on External Control Power for Primary & Backup Breakers Associated W/Reactor Coolant Pumps.Postulated Failure Analyses & Control Power Sources Provided

ML20002D583
Person / Time
Site:	Farley
Issue date:	01/12/1981
From:	Clayton F ALABAMA POWER CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8101210411
Download: ML20002D583 (5)

Text

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J' Alabama Power Company

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600 North 18th street Post Office Box 2641 Birmingham, Alabama 35291 Telephone 205 250-1000 F. L. CLAYTON, JR.

senior Vice President M3h3m3 ggg the soutt'ern sectrc system January 12, 1981 Docket No. 50-364 Director, Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Phillips Building, Room 116 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention: Mr. A. Schwencer JOSEPH M.'FARLEY NUCLEAR PLANT - UNIT 2 CONTAINMENT PENETRATION OVERCURRENT PROTECTION Gentlemen:

During a conference call on December 30, 1980 between the NRC Staff, Bechtel Power Corporation, and Alabama Power Company, additional information was requested regarding NRC Staff Position 040.15E which concerns external control power for the primary and backup breakers associated with the reactor coolant pumps. As requested, Alabama Power Company hereby stomits the following information and analysis.

I.

ADDITIONAL INFORMATION Figure 1 (attached) shows, in single line form the sources of control power associated with the primary and backup breaker for each of the three reactor coolant pumps. The numbers in circles indicate the equipment. or connections where a postulated failure is considered.

Figure 2 (attached) shows in simplified form the physical arrangement of the two sections of the Turbine Building Battery and their connections through the common fuse box.

The locations of fuse boxes 1 and 2 are also shown.

II. FAILURE ANALYSIS

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The following 18 failures are postulated (See Figure 1) l l}

1(10) - Failure of the battery 2D(2C).

,0 81012104ll

2 Joseph M. Farley Nuclear Plant - Unit 2 Containment Penetration Overcurrent Protection January 12, 1981 Page 2 2(11) - Failure of the connection between the battery 2D(2C) and fuse box 1(2).

3(12) - Failure of the connection between the battery l.

2D(2C) and the common fuse box.

4(13) - Failure of the 800A fuse in the fuse box 1(2).

5(14) - Failure of the 800A fuse in the comon fuse box.

6(15) - Failure of the connection between fuse box 1(2) and distribution cabinet 2K(2J).

7(16) - Failure of the connection between the common fuse box and distribution cabinet 2K(2J).

8(17) - Failure of the 100A breaker in the distribution cabinet 2K(2J).

9(18) - Failure of the cable between distribution cabinet 2K(2J) and distribution panel 2G(2H).

The effects of any of the above postulated failures are summarized in the following table:

RCP 2A RCP 2B RCP 2C Primary Backup Primary Backup Primary Backup IDEN ION Breaker Breaker Breaker Breaker Breaker Breaker NUMBER 1 thrcugh 9 X

X X

10 through 18 X

X X

X - LOSS'of control power as a result of the corresponding postulated failure.

The above table demonstrates that none of the 18 postulated failures msult in the simultaneous loss of control oower to the primary and backup breakers associated with a given reactor coolant pump.

Failures downstream of 9 and 18 have not been postulated since their effects are less severe than the failures analyzed above.

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i Joseph M. Farley Nuclear Plant - Unit 2 Containment Penetration Overcurrent Protection January 12,-1981 Page 3 If you have any further questions, please advise.

Yours very truly,

[ lv l%.'

F. L. Clayton, Jr.

RWS:bs Attachments cc: Mr. R. A. Thomas Mr. G. F. Trowbridge Mr. L. L. Kintner 1

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