ML20086H041

AO 75-72:on 751126,core Spray 3A Full Flow Test Valve MO-3-14-26A Failed to Close.Caused by Broken Wire on Closing Torque Switch in Valve Operator.Broken Wire Repaired & Proper Valve Operator Verified

ML20086H041
Person / Time
Site:	Peach Bottom
Issue date:	12/05/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Boyd R Office of Nuclear Reactor Regulation
Shared Package
ML20086H045	List: ML20086H041 ML20086H046
References
AO-75-72, NUDOCS 8401130368
Download: ML20086H041 (2)

Text

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PHILADELPHIA ELECTRIC COMPANY

'23O1 MARKET STREET .

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PHILADELPHIA. PA.19101 ef ,

(2:51841 4000 'O h CEC 101975 * .

December 5,1975 i "* /.

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h Mr. Roger S. Boyd Ag1. 3[V[/

Acting Director Division of Reacior Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Commission Washington, DC 20555

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Leonard Sjostrom, Region 1, Office of Inspection and Enforcemen t, United States Nuclecr Regulatory Commission on November 26, 1975 Written notification was made to Mr. James P. O'Reilly, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on November 26.

1975 In accordance with Section 6 7 2.A of the Technical Specifications, Apper. dix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the follouing report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.

~

Reference:

License Number DPR-f 6 Technical Specification

Reference:

4.5.A.I.c Peport No.: 50-278-75-72 i Report Date: December 5, 1975 f Occurrence Date: November 26, 1975 ,

Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

34 Core Spray Ful l Flow' Test Valve, M0-3-14-26A, f ailed to close.

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. Conditions Prior to Occurrence:

Unit 3 was operating at approximately 57% power.

Description of Occurren c:

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During the performance of surveillance testing on the "A" loop core spray pumps, M0-3-14-26A f ailed to close fully with the 'A' and 'C' core spray pumps running at rated flow.

8401130360 751205 13765 .

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Mr.'Rogtr-S. Boyd 0-278-75-72 ,# ^

December 5, 1975 . Page 2 Designation of Apparent Cause of Occurrence: ,

Broken wire on the closing toraue switch in the valve operator.

Analysis'of Occurrence:

The subject valve .(M0-3-14-26A - Full Flow bypass to Torus) is only open during performance of the Core Spray surveillance test.

The safety implications of this occurrence are minimal because the redundant Core Spray loop was operable and because repairs were completed in a short period of time. Additionally, the "A" loop could have been returned to operability by manually closing the valve.

Corrective Action:

The broken wire was repaired and proper valve operation verified.

Failure Data:

A previous f ailure of this type was reported as Abnormal Occurrence Report Number 50-278-75-51.

Very truly yours,

- ;;^w ,

M. . Cooney /

S crintendent .

Generation Division - Nuclear cc: Mr. J. P. O'Reilly Director, Region 1 Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue

-King of Prussia, PA 19406 e

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