05000325/LER-1979-033-03, /03L-0 on 790513:unable to Perform Daily Surveillance to Verify That Power Ratio & Peaking Factor Do Not Exceed Specified Values.Caused by Computer Analog Scanning Sys.Sys Calibr & Returned to Svc

/03L-0 on 790513:unable to Perform Daily Surveillance to Verify That Power Ratio & Peaking Factor Do Not Exceed Specified Values.Caused by Computer Analog Scanning Sys.Sys Calibr & Returned to Svc

ML19289F655
Person / Time
Site:	Brunswick
Issue date:	06/08/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289F653	List: 05000325/LER-1979-033, Forwards LER 79-033/03L-0 05000325/LER-1979-033-03, /03L-0 on 790513:unable to Perform Daily Surveillance to Verify That Power Ratio & Peaking Factor Do Not Exceed Specified Values.Caused by Computer Analog Scanning Sys.Sys Calibr & Returned to Svc
References
LER-79-033-03L, LER-79-33-3L, NUDOCS 7906150250
Download: ML19289F655 (3)

LER-1979-033, /03L-0 on 790513:unable to Perform Daily Surveillance to Verify That Power Ratio & Peaking Factor Do Not Exceed Specified Values.Caused by Computer Analog Scanning Sys.Sys Calibr & Returned to Svc

Event date:
Report date:
3251979033R03 - NRC Website

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EVENT DATE 11 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABt E CG'JSEQUENCES h lo 2 l During normal operation, it was discovered that the daily _ surveillance (PT. 1.11) re-l l quired to verify that APLilGR, MTPF, MCPR, and LIICR do not exceed their limits, could l

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See attachment for additional information. _ _

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LER CONTINUATION -- RO# 1-79-33 Facility: BSEP Unit #1 Event Date 5/13/79 Attachment The results of P.T.

1.11 on May 12, 1979, at 0810 hours0.00938 days <br />0.225 hours <br />0.00134 weeks <br />3.08205e-4 months <br /> were as follows:

Therm:il power.

............ 98.2%

CPRRAT 0.964 (margin to limit 3.6%)

MAPRAT 0.877 (margin to MAPLIIGR limit 12.3%)

MLilGR 12.0Kw/ft.

MLIIGR limit 13.4Kw/ft.

CMPF 2.179 CMPF limit 2.45 Reactor power had been constant at approximately 987. for several days.

During the approximately 36-hour period, between ccmputer P.T.

1.11 programs, no power flow or control rod changes were made, except a normal flow reduction for stop, control, and intermediate control valve testing. When it was established at 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on May 13, 1979, that the computer would he down for several hours, power was reduced to 93% to increase conservatism.

At 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on ?!ay 13, 1979, the computer was returned to service, and P.T.

1.11 was satisfactorily completed, with the following results:

Thermal power.

92.8%

CPRRAf 0.919 (nnrgin to limit 8.1%)

MAPRAT 0.826 (margin to MAPLHGR limit 17.4%)

MLl!GR II.3Kw/ft.

MLHGR limit 13.4Kw/ft.

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_2_

Cf!PF 2.170 2.45 CMPF limit With the May 12, 1979, results and the power history known, it can be reasonably concluded that the unit was operating with a safe margin at 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on tlay 13, 1979. With the 5% power reduction and the May 13, 1979, results, it can be reasonably concluded that no limits were reached.

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