ML20086K446
| ML20086K446 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/12/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086K451 | List: |
| References | |
| AO-74-36, NUDOCS 8401270114 | |
| Download: ML20086K446 (2) | |
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PHILAD ELPHI A ELECTRIC COMPANY j
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Mr. A. Giambusso
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Deputy Director of Reactor Projects g7 j
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Ocar Mr. Giambusso:
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Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Tom S5edlovsky, A.E.C. Region I Pegulatory Operations Office on July 3, 1974.
Written notification was made to Mr. James P. O'Reilly, Region I Regulatcry Operations Of fice on July 3, 1974.
In accordance with Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Dottem Atomic Power Station, the following report is being submi t ted to the Directorate of Licensing as an Abnormal Occurrence, w
erenec:
L i c c... s jium' er in n-44, Amendment Number 1 v
Technical Specification Table 3.1.1 Report No.:
50-277-74-36 Report Date:
July 12, 1974 Occurrence Date:
July 2, 1974 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Imprcper valving of'a Reactor High Pressure Scram switch and a Drywell High Pressure Scram switch.
Condit_ ions Prior to Occurrence:
Re cc t or a t 993 pcr.ve r.
Description of Occurrence:
During routine instrument surveillance testing, PS-2-2-3-55C (Reactor High Pressure Scram switch) was fcund to be valved out of ser-vice.
Immediate checking of all other surveillance tested instruments revealed that another switch (PS-2-5-12A, Drywell liigh Pressure Scram) was valved out of service.
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Mr. A. Giambusso July 12, 1974 Page 2
. Designation of Apparent Cause of Occurrence:
The cause for these occurrences is technician error in re-turning thesc. instruments to service subsequent to performing surveillance tests.
Analysis of Occurrence:
Each of these switches is part of a separate one-out-of-two-twice scram logic, and the defeating of any one switch in either logic would not have defeated the safety system logic. Therefore, the se occurrences have minimal safety implications.
Corrective Action:
All other surveillance tested instruments were checked for proper valve lineup immediately. The importance of strict adherence to procedure, and the verification of proper. valve lineup following each test has been impressed on each of the instrument technicians associated with this occurrence.
Additionally, an independent verification of post testing valve lineup on certain instrumentation systems has been added to the procedure.
Failure Data:
This ;
t hh fire: c cu.....cc vi this rypa en instrumer.t: ca ered u'y survei:iance testing.
Very truly yours,
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. C[ooney Asy't Gen'l Su crintendent Generation Division 4.
cc:
Mr. J. P. O'Reilly Director, Region i United States' Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 l
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