ML20086H596
| ML20086H596 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/29/1975 |
| From: | Meyer R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086H598 | List: |
| References | |
| AO-75-52, NUDOCS 8401180141 | |
| Download: ML20086H596 (2) | |
Text
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e C) q PHil.ADELPHIA ELECTRIC-COM PANY 2301 MARKET STREET PHILADELPHIA. PA.19101 12151841-4ooo August 29, 1975 Al Mr. Roger S. Boyd, Acting Director r
Division of Reactor Licensing Office of Nuclear Reactor Regulations (g
United States Nucicar Regulatory Commission Washington, D.C.
20555
Dear Mr. Boyd:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Commission, on August 20, 1975. Wri tten noti fication was made to Mr. James P. 08Rel11y, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory. Commission on August 20,
- 1975, In accordance wi th Section 6.7.2.A of the Technical Speci fi-cations, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power S ta ti on, the' following report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification
Reference:
3.2.0 Report No.:
50-278-75-52 Report Date:
August 29, 1975 Occurrence Datc: August 19, 1975 Faci li ty:
Peach Bottom Atomic Power Station R.D. #1, Delta, Pennsylvania 17314 Identification of Occurrence:
3A Reactor Building Exhaust Radiation Monitor (RIS-3-17-452A)
High Radiation trip set point exceeded Technical Specification limits.
Conditions Prior to Occurrence:
Uni t 3 was operating at 55% power.
Description of Occurrence:
While performing Surveillance Test 4.2, Reactor Building Exhaust Radiation Monitor Functional Test, it was discovered that the The Technical Specification limi t is <16 mr/hr. p setpoint was 24 mr/hr.
3A Radiation Monitor as found High Radiation t'ri 8401180141 750829
,7 M o PDR ADDCK 05000278
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PDR COPY SENT REGION __ - -
o Mr. Rogfr S. B3(~')
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50-278-75-52 August 29,' 1975'-4 Pega 2 Designation of Apparent Cause of Occurrence:
Instrument setpoint dri f t.
Analysis of Occurrence:
The device is one of four arranged in a one-out..of-two twice logic (which ini tiates a Group III isolation on reactor zone ventilaa tion exhaust high radiation) such that the high trip setpoint would not have prevented the isolation from actuating at the correct point.
For this reason, and the fact that the device was still functional, the safety implication of this occurrence is minimal.
' Corrective Action:
The setpoint was adjus ted, the calibration checked, and the surveillance test was successfully rerun on the 3A monitor.
Several days were allowed to elapse, then the device was rechecked to deter-mine if any further setpoint drif t would be evident. The recheck in-dicated that no further drif t had occurred.
Failure Data:
No previous failures of this type.
Very truly yours,
)
/
/, - ( ).t.'u t ; L -
Rankin D. Meyer General Superintendent Generation Division Mr. James P. O'Reilly, Director, Region 1 cc:
Office of Inspection and Enforcement United States Nuclear Regulatory Commission l
631 Park Avenue King of Prussia, PA 19406 i
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