ML20086G961
| ML20086G961 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/27/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086G964 | List: |
| References | |
| AO-75-18, NUDOCS 8401130090 | |
| Download: ML20086G961 (2) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHI A. PA.19101 1215) 841-4 o00 March 27, 1975 M3 MQ Y(
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Mr. A. Giambusso I2J O
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Division of Reactor Licensing
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Office of Nuclear Reactor Regulations
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United States Nuclear Regulatory Comission
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Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforcement, flnited States Nuclear Regualtory Comission on March 20, 1975 Written notification was made to Mr. James P. O'Reilly, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Conmission on March 21, 1975 In accordence witn Section o./.2.A of tne tecnnical specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification
Reference:
Table 3 2.A Report No.:
50-278-75-18 Report Date:
March 27,1975 Occurrence Date:
March 20, 1975 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of a reactor low water level switch, LIS-3-2-3-578,
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to provide a Group 1 isolation signal.
Conditions Prior to Occurrence:
Unit 3 at full power.
[DW 'l Description of Occurrence:
During a routine instrument functional surveillance test, LIS-3-2-3-57B switch No. I f ailed to open to provide a Group 1 isolation signal.
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PDR ADOCK 05000278 COPY SENT REGION w.
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-s March 27, 1975 Page62 Designation of Apparent Cause of Occurrence:
Sticking switch contacts repaired by cleaning.
Analysis of Occurrence:
The companion switches in this logic were tested successfully; therefore, the safety implications of this f ailure are minimal because this switch is connected in a one-out-of-two twice logic and would not have prevented an isolation.
CoFrective Action:
The switch was removed, contacts cleaned, replaced and tested in accordance with the applicable calibration type surveillance test.
Failure Data:
No previous failures of this type.
Very truly yours,
?
y J. Cooney/
Mss't Gen't Superintendent Generation Division cc:
Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement Region i United States Nucicar Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 i
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