ML19339A019
| ML19339A019 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 10/23/1980 |
| From: | Boyle E NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA) |
| To: | Higgins J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8010310549 | |
| Download: ML19339A019 (1) | |
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DCT 2 3 gggg Mr. James Higgins Resident Inspector U. S. Nuclear Regulatory Comission P. O. Box B Rocky Point, New York 11778
Dear Mr. Higgins:
Attached is a copy of Hatch 2 LER 80-034 as you requested in our telephone conversation on October 21, 1980. If you need any additional information, please feel free to contact me on 301/492-7724.
Sincerely,,
3 Eugenia L. Boyle Licensee 0;ierations Evaluation Branch Office of Management and Program Analysis
Attachment:
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EVENT DESCRIPTtCN 4.NO P5'CS A8LE CONSEOUE*1CES h During cold shutdcan wnile performing calibratien en main steam line RTTI I temce'rature switches 2B21-21010A, it012A,10130 were found to have bad re la f I repeatability; 2821-it0108,it0113, :10123,-!!0123 exceeded the allcwable r
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gory, L a repetitive event, reference LER 50-256/1973-041.
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CAUSE CESCRIPTICN AND CcARE073VE ACT1(.,NS h l jag l The cause of this event has been attributed to instrument dri# and ethed I
of calibration. Switches 252'-t:010A,::012A, ;012D were reclaced. tnen tiO10A, isi,i ;
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,,,,,l returned to service. The calibratien precedure has been revised to s:ec-ify the utiliza:icn of Canwal Tem:erature Switch Test Se.
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NARRATIVE REFORT Georgia Power C mpany Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 30-366/1980-034
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On March 2d,1980, while :erforming Fenwal Type 17000 and 13000 Temcerature Switch Calibration curing cold snutdcwn, Main Steam Line Tunnel Temperature Switches 2321-N010A, N013A, and N0130 were found to nave ba re:ea:acility; 2821-N0105, N0118, N0123, and N0135 exceecec tne allcwable Tech 5:ec limit (S 200cF). The "as-found" tric points were as follcws: 2321-N01C3 3 205cF, N0118 @ 205cF, N0123 9 215.SoF, and N0135 3 2190F.
The cause of this event has been attributed to instrument drift and method of calibration.
Switches 2321-N0105, N0113, 50123 and N013B were attri uted to instrument drift. They were recaliorate: anc returned to service.
Switenes 2B21-N010A, N013A and M013D were attribute: :: me: hec of calibration.
It has been hypothesi:ed th the present me hed of calibration (cven) may not have the stability to accurately set these switches. These swit:nes were replaced and recalibrated utili:ing a Fenwal Tem:erature Saiten Tes: Set anc successfully returned :: service.
"Fenwal Type 17000 and 130C0 Tercera ure Switch" pr:cedure has teen rev sed to provice for the utili:ation of a Fenwal i
Temperature Swi en Test Set.
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There were no effects to public health and safety due to this event, nor was safe plant operatica effecteo.
This is a repetitive even; as last reported on Re cr:able Occurrence N:. 50-355/
1978-041. Uni: I utili:ss the same tem:erature suitenes f:r this a::iicati:n, Reference Reper:acie 0 :urrence N:: 50-321/1979-021. A study revealed that there were no ;cceric c:nsequences :: :nis even:.
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