ML20086K914
| ML20086K914 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/04/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086K917 | List: |
| References | |
| AO-74-28, NUDOCS 8402070072 | |
| Download: ML20086K914 (2) | |
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e PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET PHIL.S.DELPHI A. PA.19101 (215)841-400o June 4,1974 fir. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing 5 0
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Dear t4r. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to tir. A. D. Toth, A.E.C.
Region I Regulatory Operation: Office on May 26, 1974. Written notifi-cation was made to tir. James P. O'Reilly, Region I Regualtory Operations Of fice on May 28, 1974.
In accordcnce with Section 6.7.2.A of the Tech-nical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bot tom Atomic Power Station, th: following report is being submitted to the Directorate of Liccasi.u a:., on Aboorma! accur er nca
Reference:
License flamber DPR-44, Amendment flumber 1 Tecnnical Specification Table 4.2.A Report flo.:
50-277-74-28 Report Date:
June 4, 1974 Occurrence Date: May 25,1974 Facility:
Peach Bottom Atcmic Power Station R. D.
1, Delta, Pennsylvania 17314 f
s Identification of Occurrence:
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Failure of dPIS-2-2-II80 to trip consistently.
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'u Conditions Prior to Occurrence:
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Description of Occurrence:
During a functional instrument surveillance test, dPIS-2-2-Il8D, a PCIS Group I input on liain Steam Line High F low, failed to trip con-f sistently. This switch monitors steam flow'in the "C" Mein Steam Line.
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Mr. A. Giambusso s gs June 4, 1974
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Page 2 Jh. o Desionation of Acoerent Cause of Occurrence:
Improper "as built" positioning of the mercury bulb type reed switch such that the magnet would not f ully pick up the reed consi stently.
When the switch did function, however, it did function at the proper setpoint.
Analysis of Occurrence:
There are no safety implications associated with this occurrence si nce its companien switch in a one-of-two-twice logic on the same 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 the calibration check type of surveillance test which includes a functional test.
On May 27, 1974, the other 15 similar switches were inspected for a similar problem and functicnally tested.
No f ailures were noted and no adjustments were necessary.
Failure Data:
A functional f ailure of a similar switch was reported as an Abnormal Occurrence on September 6,1973 Very truly yours, j ;,
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M. J: Cooney '
As s ' t. Gen't Superintendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region i United States Atomic Energy Conmission 631 Park Avenue King of Prussia, PA 19406
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