ML20086J111

AO 74-39:on 741221,drywell Equipment Drain Sump Isolation Valve AO-3-20-74 Failed to Close on Primary Containment Isolation Sys Isolation.Caused by Solenoid Valve Stuck in Energized Position,Preventing Valve Closure

ML20086J111
Person / Time
Site:	Peach Bottom
Issue date:	12/31/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086J115	List: ML20086J111 ML20086J116
References
AO-74-39, NUDOCS 8401230187
Download: ML20086J111 (2)

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O S PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET hA -'Il /

gs PHILADELPHIA. PA.19101 [. I e,

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December 31, 1974 '

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. ,1 sj Hr. A. Giambusso 'O I;.- -Q W Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C. 20545

Subject:

Abnormal Occurrence ,

The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Of fice on December 21, 1974. L Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on December 23, 1974 In accordance with Section 6.7.2.A of the Technical Speci fications, Appendix A of DPR-56 for Uni t 3 Peach Bottom Atomic Power Station, the following report is being submi tted to the Di rectorate of Licensing as an Abnormal Occurrence. F

Reference:

License Number DPR-56 c Technical Specification

Reference:

3.7.0 Report No.: 50-278-74-39 Report Date: December 31, 1974 Occurrence Date: December 21, 1974 -

Faci li ty: Peach Bottom Atomic Power Station R.D. #1, Delta, Pennsylvania 17314 Identification of Occurrence:

Drywell equipment drain sump isolation valve A0-3-20-74 {

failed to close on a PCIS isolation. <

l Conditions Prior to Occurrence:

Unit 3 operating at 3182 MWT, 96.6% power. Startup Test 27, Turbine Trip had just been performed causing reactor scram and group 2 and 3 PCIS isolation.

Description of Occurrence: 7 y

During the PCIS isolation, A0-3-20-94 failed to isolate. C.

The valve also failed to isolate on a manual closure signal. /'

B401230187 741231 PDR ADOCK 05000278 g S PDR y COPY SPMr REGM <W

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O O Mr. A. Giambusso -

December 31, 1974 Page 2 Designation of Apparent Cause of Occurrence:

The solenoid valve which de-energizes to bleed the air off the diaphram stuck in the energized position preventing valve closure.

Analysis of Occurrence:

The other isolation valve in this line, A0-3-20-95, did close to isolate the line. Therefore, there is minimal safety im-pli ca tion.

Corrective Action:

The solenoid valve was rebuilt and satisfactory operation was veri fied wi thin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> of the occurrence.

Failure Data:

Similar occurrences were reported as Abnormal Occurrence Report Numbers A0-50-277-74-7 and A0-50-278-74-26.

Very truly yours, h-f>LC M. J. Cooney -

Asst. Gent. Supt.

Genera tion Division cc: Mr. James P. O'Reilly ,

Director, Region 1 l-United States Atomic Energy Commission -

631 Park Avenue King of Prussia, PA '19406 l

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