ML20086K457

AO 75-10:on 750127,incorrect Valve Lineup Following Local Leak Rate Testing Rendered Standby Liquid Control Sys Inoperable.Caused by Personnel Error.Personnel Instructed in Proper Method of Performing Tests

ML20086K457
Person / Time
Site:	Peach Bottom
Issue date:	02/06/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
Shared Package
ML20086K460	List: ML20086K457 ML20086K466
References
AO-75-10, NUDOCS 8401270122
Download: ML20086K457 (2)

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' PHILADELPHIA ELECTRIC COMPANY C

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Mr. A. Giambusso Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Commission i Washington, D.C. 20555

Subject:

Abnormal Occurrence g

The following occurrence was reported to Mr. Walt Baunack, N.R.C. Region 1 Nuclear Regulatory Commission on January 28, 1975.

Written notification was made to Mr. Jamen P. O'Reilly, Region 1 Nuclear Regulatory Commission Office on January 28, 1975. In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station the following report is being submitted to the Director of Reactor Licensing as an Abnormal Occurrence.

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Reference:

License Number DPR-44 Technical Specification

Reference:

3.4.A.1 Report No.: 50-277-75-10 Report Date: February 6, 1975 Occurrence Date: January 27, 1975 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

Incorrect valve lineup following loti 1eak rate testing which rendered the Standby Liquid Control System .iorerable.

g Conditions Prior to Occurrence:

Unit 2 at 90"3 power.

8401270122 750206 --

DR ADOCK 05000277 /#

PDR COPY SENT REGION -

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. , Description of Occurrence:

During local leak rate testing of the Standby Liquid Control System penetration, a normally locked open block valve was closed to accomplish the test. Following the test, the valve was left closed and the plant was subsequently started up.

Designation of Apparent Cause of Occurrence:

In order to improve the accuracy of the test, the Results Engineer approved a change to the valve lineup permitting the packing to be loosened on the subject valve so as to provide a vent upstream of the check valve which forms one of the isolation valv6s. During the test setup, the individual assigned to the test mistakenly closed the valve to provide a vent path through the packing. Although in closing the valve he deviated from the requested valve lineup, he properly applied a leak rate test tag to the valve. When the test was completed, the valve packing was retightened, but the valve was not reopened, locked, or untagged. Following reactor startup, the tag was observed by a member of the plant s taff and subsequent in-vestigation revealed this reponted occurrence.

Analysis of Occurrence:

Closure of the block valve made it impossible to inject the Standby Liquid Control System into the reactor. However, in the unlikely event that injection was required, the failure of the system to inject would have been observed by the reactor operator due to the fact that the Standby Liquid Control Tank level would not decrease. Subsequent investigation would have remedied the situation.

Corrective Action:

Personnel involved in Local Leak Rate testing have been instructed in the proper method of performing the tests and making test procedure changes. A revised LLRT procedure has been written approved, and implemented for future testing.

Failure Data:

None.

Very truly yours, M. . Cooney As 't Gen'l Superintendent Generation Division cc: Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement Region 1 United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

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