ML20086K924
| ML20086K924 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/28/1974 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086K917 | List: |
| References | |
| AO-74-28, NUDOCS 8402070078 | |
| Download: ML20086K924 (2) | |
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Q I,%sch Bottos Atomic Power tion 3,1
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May 28, 174 l..
Mr. James P. O'Reilly, Director b
United States Atomic Ibergy Comaimaion Directorate of Regulatory Operations y
631 Park Avenue j
King of Prussia, Pennsylvania 19406 i
Subject:
Abnormal Occurrence 24-Hour Notification Confirming my conversation with Mr. A. D. Toth, A.E.C. Region 1 Regulatory j
Operations Office on May 26, 1974.
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Reference:
License Number DPR 44, Amendment Number 1 i
Technical Specification Table 4.2.A Report No.:
50-277-74-28 Report Date:
May 26, 1974 1
Occurrence Date May 25, 1974 i
I Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
E-Failure of APIS-2-2-ll8D to trip consistently J
Conditions Prior to Occurrence:
j Plant operating at close to rated power.
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Description of Occurrence:
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During a functional instrument surveillance test, dPIS-2-2-118D, a
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PCIS Group I input on Main Steam Line High Flow, failed to trip consistently. This switch monitors steam flow in the "C" Main Steen Line.
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Designation of Apparent Cause of Occurrence:
Improper "as built" positioning of the mercury bulb type reed switch arch that the magnet would not fully pick up the reed consistently.
I When the switch did function, however, it did function at the proper setpoint.
d Analysis of Occurrence:
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There are no safety implications associated with this occurrence since its companion switch in a one-of-two-twice logic on the same t
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steam line had just been tested and found fully operable.
Corrective Action:
The mercury bulb was repositioned to provide positive and consistent operation. The device was recalibrated and tested per t':e calibration check type of surveillance test which includes a functional test. On May 27, 1974, the other 15 similar switches were inspected for a afeitar l
problem, and functionally tested with no failures and no adjusteente s
necesamry.
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A functional failure of a similar switch was reported as an Abnormal l-occurrence on september 6, 1973
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{l W. T. Ullrich, Superintendent i.
Peach Bottom Atomic Power Station i
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