ML20086K589
| ML20086K589 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom, Salem  |
| Issue date: | 12/07/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-74-31, AO-74-54, NUDOCS 8401270321 | |
| Download: ML20086K589 (2) | |
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PHILADELPHIA ELECTai COM PANY
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.n 2301 fAARKET STREET f,,,,,
PHILADEs. PHI A. PA.1910t O,,.'f I
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Mr. A. Giambusso Deputy Director of Reactor Projects Uni ted States Atomic Energy Commission Directorate of Licensing Washington, D.C.
20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Eldon Brunner, A.E.C. Region 1 Regulatory Operations Office On November 28, 1974 Wri tten noti fication was made to Mr. James P. O'Reilly. Region 1 Regulatory Opera tions Of fice on November 29, 1974.
In accordance wi th Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 and DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submi tted to the Directorate of Licensing as an Abnormal Occurrence.
Reference License Number DPR-44 and DPR-56 Technical Speci fication
Reference:
Tabic 3.2.B Report No.:
50-277-74-54 and 50-278-74-31 Report Date:
December 7, 1974 Occurrence Date: Novembe r 27, 1974 Facility:
Peach Botton Atomic Power Station Identification of Occurrence
/
Discovery of incorrect setpoints on ADS confirmatory low level switches.
Condi tions Prior to Occurrence:
Unit i at approximately 100% power and Unit 3 at approx-imately 50% power.
7 Description of' Occurrence:
i As a result of the review of a suspected abnormal occurrence where LIS-3-2-3-83B was found to be set at +11 inches rather than $+6 inches,L a typographical error in the Technical Specifications was identified (:+6 inches should have been 1+6 inches). The existence f hh2 741207 N300 05000277 S
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COPY SENT REGION PDR m
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Mr. A. Giambusso Occember 7, 1974 Page 2 this typographical error was confirmed via telephone conversations' wi th Mr. Walt Baunack--Regulatory Operations who had discussed the probicm wi th Mr. Lear and Mr. Jaffe--Di rectorate of Licensing.
The typograph-
{ cal error had been carried into the surveillance test procedure, which was used to calibrate these switches. The switches were there-fero set to trip between 0 inches and 6 inches reactor Icvel because the instrument span is 0 to 60 inches.
Designation of Apparent Cause of Occurrence:
Typographical error in Technical Specifications.
Analysis of Occurrence:
The safety implications of this error are minimal. These switches would have functioned correctly to confirm reactor low 1cvel and thus permi t ADS operation if required, or would have proven that reactor icvel was satisfactory, thus preventing ADS operation caused by an instrument line failure. However, the switches would have operated at slightly Icss than 6 inches rather than slightly more than 6 inches reactor level.
Corrective Action:
The switches were reset to a setpoint 2+6 inches in accor-dance with approved revisions of the appropriate surveillance tests.
The typographical error in the Technical Specifications will be corrected, railure Data:
None.
Very truly yours, r
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'e' j - l ud > te L L,,s M. J. Cooney
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Asst. Gen 1 Superintendent f
Generation Division
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tir. J. P. O'Reilly cc:
Di rector, Region 1 United States Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406
.