ML20086G973
| ML20086G973 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/12/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086G975 | List: |
| References | |
| AO-75-16, NUDOCS 8401130150 | |
| Download: ML20086G973 (2) | |
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March 12, 1975 Mr. A. Giambusso Director Division of Reactor Licensing Of fice of Nuclear Reactor Regulations United States Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. H. W. Crocker, Region 1, Office of Inspection and Enforcement, NRC on March 2, 1975 Written notification was made to Mr. James P. O'Reilly. Office of
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Inspection and Enforcement, Region 1, NRC on March 3, 1975 In 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 report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Re ference:
License Number DPR-56 Technical Specification
Reference:
3 1, Table 3 1.1 Report No.:
50-278-75-16 Report Date:
March 12, 1975 Occurrence Date: March 2, 1975 Facility:
Peach Bottom Atomic Power Station R.D. 1 Delta, Pennsylvania 17314 Identification of Occurrence:
Main Steam Line Fadiation Monitor RIS 3-17-2510. f ai l ed down-scale.
Conditions Prior to Oc urrence:
Plant operating at 100% power.
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,e3 Mr. A. Giambusso N-March 12, 1975 Page 2 Description of Occurrence:
Main Steam Line Radiation Monitor RIS 3-17-251D failed down-scale while the plant was cperating at approximately 10Q% power.
Designation of Apparent Cause of Occurrence:
Electronic failure.
Analysis of Occurrence:
The Monitor failed downscale which made the particular channel inoperative.
Because of the redundant channels of instrumentation, the remaining Main Steam Line High Radiation Isolation and Scram signals still had the capability of performing their intended functions. There-fore, minimal safety significance is attached to this occurrence.
Corrective Action:
The drawer was placed in the tripped condition until repairs were completed. Miscellaneous electronic parts were replaced.
The drawer was returned to service and has been funct ioning correctly since the repairs.
r = < i..- o ne3 None.
Very truly yours, M.
. Cooney Ass t Gen' t Superintendent Generation Division cc:
Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement Region i United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406