ML20086L196
| ML20086L196 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/17/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086L198 | List: |
| References | |
| AO-74-19, NUDOCS 8402070457 | |
| Download: ML20086L196 (2) | |
Text
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s PHILADELPHIA ELECTRIC COMPANY e
2301 MARKET STREET p.
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PHILADELPHIA. PA.19101 N2,
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l April 17, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing tlashington, DC 20545 j
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. R. A. Feil, A.E.C.
Region I Regulatory Operations Office on April 9,1974. uritten noti-f i cat ic...;;.:.T.cdc Lv ;;.. Jo..o F. O'Reilly, Region i neguiatory Operations Of fice on April 9,1974.
In accordance with Section 6 7 2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-44, Amendment Number 1 Technical Specification Tabic 3.1.1 Report No.:
50-277-74-19 Report Date:
April 17, 1974 Occurrence Date: April 8,1974 Facility:
Peach Bottom Atomic Power Station R.D. I, Delta, Pennsylvania 17314 Identification of Occurrence:
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Setpoint shif t on PS-2-5-11A condenser low-vacuum scram.
l Conditions Prior'to Occurrence:
Plant in cold shutdown.
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o Description of Occurrence:
During instrument surveillance testing, PS-2-5-llA tripped at 22 3 inches Hg vacuum, decreasing instead of the Technical Specification limit of greater than 23 inches Hg.
Designation of Apparent Cause of Occurrence:
Minor instrument setpoint shift.
Analysi s of Occurrence:
There were no safety implications associated with the setpoint shift of this instrument as it i s it. a one-out-of-two twice logic and the plant was in cold shutdown condition.
Corrective Action:
The switch was immediately recalibrated, tested, and returned to service. The other three switches monitoring the same parameter were calibration checked and functionally tested. These switches were found to have setpoints within Technical Specification limits.
Since the A switch has shown a definite continued downward setpoint shif t, a re-plo w neni sw i tti.
s u'u au q ue n t l y insiolled. The u ;9;4.el A pra, orc was switch was sent to the P.E. Company Testing Section Laboratory in Philadelphia for further investigation of this problem.
Failure Data:
Setpoint shift on this type of switch monitoring the condenser vacuum has previousi f been reported as Abnormal Occurrence 50-277-74-1.
Very truly yours,
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'H. J. Cooney /
Ass't Gen't Superintendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region i United States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406
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