ML20086G903
| ML20086G903 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/06/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-75-30, NUDOCS 8401120589 | |
| Download: ML20086G903 (2) | |
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PHILADELPHIA ELECTRIC COMPANY 457N 2301 M ARKET STREET N N ~ ~ '
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June 6, 1975 PA*
Mr. A. Giambusso Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Conmission y
Washington, DC 20555
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Don Caphton, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission on May 23, 1975. Written notification was made to Mr. James P. O'Reilly, Region 1, Of fice of Inspection and Enforce-ment, United States Nucleer Regulatory Cunmission on May 30, 1375 Ir.
accordance with Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following occurrence is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification
Reference:
3 2.A Report No.:
50-278-75-30 Report Date:
June 6, 1975 Occurrence Date:
May 29, 1975 Facility:
Peach Bottom Atomic Power Station s
R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of the temperature sensor, TE-3-12-98, which provides the temperature signal to the Reactor Water Cleanup System High Tempera-ture Isolation Switch.
Conditions Prior to Occurrence:
Unit 3 at full power.
Description of Occurrence:
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During a routine instrument surveillance test,.it.was discovere'd that there was no temperature input to the RWCU High Temperature Iso-lation Switch.
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s Mr. A. Giambus'sd g) 50-278-75-30 June 6, 1975 Page 2 Designation of Apparent Cause of Occurrence:
Failure of the temperature element primary sensor.
Analysis of Occurrence:
Safety significance of this incident is minimal.
The function of this switch is to prevent damage to the demineralizer resin from high temperature by isolating the system when the demineralizer inlet water temperature reaches 140 F.
Corrective Action:
The reacter water cicanup system was isolated and the de-fcctive temperature sensor was replaced.
The sensor was checked 'against an adjacent sensor to prove its operability and then the switch was calibrated in accordance with the applicable surveillance test pro-cedure. The reactor water cleanup system was then returned to service.
Failure Data:
No previous f ailures of these temperature elements.
Very truly yours, M. J Cooney Ass' Gen' t Super 'ntendent Generation Division cc:
Mr. J. P. O'Reilly Director, Region 1 Office of Inspection ano Enforcement United States Nuclear Re gulatory Commission 631 Park Avenue King of Prussia, PA 19406 l
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