ML20086K366
| ML20086K366 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/20/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086K364 | List: |
| References | |
| AO-74-41, NUDOCS 8401270046 | |
| Download: ML20086K366 (1) | |
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LADELPHIA ELECTRIC COMPANY Peach Bottom Atomic Power Station Delta, Pennsylvania 17314 September 20, 1974 Mr. James P. O'Reilly, Director United States Atomic Energy Com:nission Directorate of Regulatory O'pc:ations
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3-631 Park Avenue 6[M
,;,C1N; King Of Prussia, Pennsylvania 19406 Rg
Subject:
Abnor=al Occurrence 24-Hour Notification PMf J.?;., " k Confirming R. S. Fleischmann's phone conversation with Mr. Walt Baunack.
-[ f!.f A.E.C. Region 1 Regulatory Operations Office on September 20, 1974.
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Reference:
License Number DPR-44, Amendment Number 1 Technical Specification 3.2.B hy.]
Report No.:
50-277-74-41 Y.J.Q'],
- !c Report Date:
September 20, 1974 hg-.Q Occurrence Date:
September 19, 1974 Facility:
Peach Bottom Atomic Power Station
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R. D. 1, Delta, Pennsylvania 17314
,.,-p'l-Identification of occurrenca:
ME ri Setpoint of HPCI ateam line high flow sensor outside of Technical Specification limits.
Conditions Prior to Occurrence:
The reactor was at 80% power.
g Description of Occurrence:
During a routine instrument calibration eurveillance test, the setpoint of one of the EPCI' ateam line high flow sensors, DPIS-2-23-76, was found to have drifted outside the limita allowed by the Technical Specifications. The prescribed setpoint for this 3g a device is less than or equal to 225 inches H 0.
The device was found to trip at Q jf 2
231 inches H20.
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W' Designation of Apparent Cause of Occurrence:
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A careful examination of the subject switch revealed no evidence of binding or other mechanical calfunction. The switch tripped consistently at 231 inches B 0.
This 3fg,',
2 setpoint failure is attributed to setpoint drif t only.
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%'h Analysis of Occurrence:
i The HPCI steam line high flow isolation signal circuitry is arranged in a one out d
of two configuration. A high flow signal from either of the two differential pressure devices is sufficient to cause an isolation of the HPCI steam supply.
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Due to the s=sil magnitude of the setpoint shift and the fact that the device was n.I. Q.
functional,,this occurrence has a minimal effect on plant safety.
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Corrective Action:
i The subject device was imediately recalibrated to within acceptable limits and returned to service. The calibration of the companion switch was checked and found to be satisfactory.
8401270046 740929 m
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i PDR ADOCK 05000277 i
Failure Date:
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