ML20084B519

RO 76-28:during Mgt Review of Existing Plant Design, Containment Spray Pump Control Switch Found to Preclude Sister Pump from Automatic Starting,If Control Switch in Lockout.Cause Not Stated.Operating Procedure OP-19 Revised

ML20084B519
Person / Time
Site:	Nine Mile Point
Issue date:	10/14/1976
From:	Schneider R NIAGARA MOHAWK POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
11147, RO-76-28, NUDOCS 8304060486
Download: ML20084B519 (2)

Text

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NIAGARA MOHAWK POWER CORPORATION .

NlAGARA MOHAWK 300 ERIE DOULEVARD. WEST SYR ACUSE. N. Y.13 202 October 14, 1976 E 6 s

blt James P. O'Reilly Directorate of Regatatory Operations j'

NQ United States Nuctcar Regutatory Commission .

s Region 1

• u . li' Jg'yOh Qi 631 Park Avenue q *'

King of Prussia, PA. 19406

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9 RE: Docket No. 50-220 $MW

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Dear blt. C'Rcitty:

In accordance with Nine blite Point Nuclear Sta. tion Unit #1 Tecluticat Spec,ification 6.9, we hereby submit Licensee Event Report 76-28.

This .tcport :cas comptc,ted telthin .the .in.tertt af the Licensee Event Report ins truction Sooklet 00E-SS-001, dated October 1974, revised December 24, 1974. Due .to the minimal significance -

category of this repor.t, no supptcmental report is included.

Very.truly yours,

.-> f /* 7 j'![(.ghu &.- (V

- R. R.' Scluteider Vice Presidestt -

Electric Production TJ0/stm -

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( , ATTACINENT'TO LER 28

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l EVENT DESCRIPTION During a management review of existing plant design, it was discovered

[ that if the control switch for the containment spray pump were placed in lockout, the sister pump was enabled from automatic starting. The containment spray system is 400% redundant with 4 pumps. The emergency power supply for the effected sister pumps is the same EDG. This precluded start of a sister pump with one in lockout is only effected by an automatic start signal. The pump could be started manually from the Control Room. An electrical change is being considered to eliminate this situation and in the interum, a change has been made to Operating Procedure OP-19 stating that the pumps will never be placed in the lockout position when operability is required.

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