ML20086K608
| ML20086K608 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/17/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-74-49, NUDOCS 8401270358 | |
| Download: ML20086K608 (2) | |
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121518414000 November 17, 1974 So-277 tjr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C.
20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Don Caphton, A.E.C. Region 1 Regulatory Operations Office on November 8,1974.
Written.loti fication was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on November 8,1974 In accordance wi th 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 Table 3 2.B Report No.:
50-277-74-49 Report Date:
November 17, 1974 Occurrence Date:
November 7,1974 Faci li ty:
Peach Bottom Atomic Power Station R.D. 1, Del ta, Pennsylvania 17314 Identi fication of Occurrence:
Setpoint shi f ts on RCIC Steam Line Hi Flow Isolation Swi tch, dPIS-2-13-83.
Condi tions Prior to Occurrence:
Plant Shutdown.
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Mr. Giambusso P)
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Description of Occurrence During routine instrument surveillance testing; dPIS-2-13-83 was found to trip at 455 inches H O differential and 451 inches H O 2
2 differential on switches 1 and 3 respectively. The Technical Spectfication limit is i450 inches H O differential.
2 Designation of Apparent Cause of Occurrence:
Setpoint shi f t wi thin the accuracy of the instrument.
Analysis of Occurrences The safety implications are minimal since the setpoint shif t was very small and the companion redundant switch was tested 6nd found to trip wi thin the Technical Speci fication limi ts.
Corrective Action:
The swl tches were adjusted and checked for proper cali bra tion in accordance with the applicabic survei11ance test.
Failurn Data:
A similar setpoint shif t of dPIS-2-23-76 was reported on 9/20/74 as Abnormal Occurrence 50-277-74-41.
Very truly yours,
//'ha. :n c./
M..J.
Cooney l
Ass' t Gen'1 Sdperintendent Generation Division i
cc: Mr. J. P. O'Reilly Director, Region 1 l
Uni tod States Atomic Energy Conmission l
631 Park Avenue King of Prussia, PA 19406 1