ML20086J197
| ML20086J197 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/05/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086J196 | List: |
| References | |
| AO-74-33, NUDOCS 8401230298 | |
| Download: ML20086J197 (1) | |
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Abnormal Occurrence 24-Ilour Notification CO M
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Confireing V. T. Ullrich's phone conversation with Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on December 5, 1974.
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Reference:
License Number DPR-56 lechnical Specification
Reference:
Table 3.2.A J.Q um Roport No.:
50-278-74-33 ME s
lf; Report Date:
December 5, 1974 Occurrence Date:
December 4, 1974 p,
Fecility:
Peach Botton Atomic Power Station Ty
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Delta, Pennsylvania 17314 t F.J M
Identification of Occurrence:
4"b; Failure of Main Steam Line High Flow Switch dPIS-3-2-116C to trip during a 4%
surveillance test.
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Conditions Prior to Occurrence:
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Unit 3 at approximately 75% power.
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Description of Occurrence:
During a routine surveillance test, dPIS-3-2-Ll6C failed to trip.
Designation of Apparent Cause of Occurrence Probably a clight mechanical binding.
The Linding cleared during visual examination of the switch linkage.
Analysis of Occurrence:
There are no safety implications since its con:panion switch in a one-of-two-twice logic was operable and would have tripped at the prescribed setpoint.
4 Co r rec t ive Ac tion :
Following the failure to trip, the f ace and scale were removed from the instrument in order to watch the linkage during an operation to try to determine the type of f ailure.
The switch was again tested and this tima and each succeeding time it worked properly.
It was then reassembled, tested and continued to work successfull Failure Data:
Previous occurrences on theos type switches have been reported as dPIS-2-2-119D on 9/7/ 7 3, 50-277-74-28, 50-277-74-48, and 50-278-74-20.
Very truly yours, WYW W. T. Ullrich, Superintendent Pach Bottom Atomic Power Station 8401230298 741205 i
PDR ADOCK 05000278 S
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