ML20086J180
| ML20086J180 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/05/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J183 | List: |
| References | |
| AO-74-30, NUDOCS 8401230278 | |
| Download: ML20086J180 (2) | |
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O PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHIA. PA.19101 1215) 841-400o December 5, 1974
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w Mr. A. Giambusso Y
.A 3 Deputy Director of Reactor Projects
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United States Atomic Energy Conmission
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Dear Mr. Giambusso:
QA y-Subj,ect : Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region i Regulatory Operations Office on November 26, 1974.
Written notification was made to Mr. James P. O'Reilly, Region i Regu-latory Operations Office on November 26, 1974.
In accordance with Section 6 7 2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the f ollowing report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification Reference Table 3 2.B Report No.:
50-278-74-30 Report Date:
December 5, 1974 Occurrence Date:
November 25, 1974
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7 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of O'ccurrences FaildFe of rel'ay 14A-K9B in thc[LPCI/Co're' Sp. ay low reactor..
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pressure permissive logic to make-up consistently.
Conditions Prier to Occurrence:
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Unit 3 operating at f3 pcwcr.
4 Description of Occurrence:
During a routine instrument surveillance test.on PS-3-3'528,
-i its relay (14A-K98) to the LPCI/ Core: Spray low reactor pressure per-missive logic f ailed -to makeup consistently..
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Mr. A. Giambusso Page 2 December 5, 1974 s
, m Designation of Apparent Cause of Occurrence:
Dirty and slightly misaligned relay ccatacts.
' Analysi s of Occurrence:
.i Because this switch / relay combination operates in a one-out-the failure of any one of the four devices will not of-two-twice logic, render the logic inoperable. Therefore, the safety implications of this single f ailure are minimal.
Corrective Action:
Investigation revealed that a slight contact misalignment coupled with dirty contacts led to the inconsistent relay contact The contacts were burnished and realigned and the relay oper-makeup.
Review of ation again checked several times with no further f ailures.
previously reported relay cont'act problems (see be l ow) indicates that the four reported f ailures have occurred on three dif ferent types of relays. Therefore, no generic problem is believed to exist.
Failure Data:
Previous relay contact problems were reported as Abnormai 50-277-74-5, 50-277-74-9, and 50-277-74-50.
occurrence Very truly yours,
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M.
J., ooney
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Ass't Gen't Superintendent' Generation Division Mr. J. P. O'Reilly cc:
Director, Region 1 1
United States Atomic Energy Commission 631 Park Avenue King.of Prussia, PA 19406
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