ML20086J111
| ML20086J111 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/31/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J115 | List: |
| References | |
| AO-74-39, NUDOCS 8401230187 | |
| Download: ML20086J111 (2) | |
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December 31, 1974 6:s/
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'O Hr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C.
20545
Dear Mr. Giambusso:
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.
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Reference:
License Number DPR-56 Technical Specification
Reference:
3.7.0 c
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
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failed to close on a PCIS isolation.
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:
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During the PCIS isolation, A0-3-20-94 failed to isolate.
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The valve also failed to isolate on a manual closure signal.
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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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