ML19321A143

RO 1-80-59:confirms 800716 Telcon Re Notification by GE of Incorrect Use of Total Peaking Factor for Adjusting Gain of Average Power Range Monitors.Caused by Incorrect Ref Value. Tech Spec Values to Be Changed

ML19321A143
Person / Time
Site:	Brunswick
Issue date:	07/17/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:
References
BSEP-80-1188, NUDOCS 8007220521
Download: ML19321A143 (3)

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Carolina Power & Light Company

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, Brunswick Steam Electric Plant P. O. Box 10429 Southport, N. C. 28461 July 17, 1980 FILE: 09-13516 SERIAL: BSEP/80-1188 Mr. James P. O'Reilly, Director

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U. S. Nuclear Regulatory Commission Region II .

101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1 & 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324

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CONFIRMATION FACSIMILE FOR AN IMMEDIATELY REPORTABLE EVEST (LER l-80-59)

Dear Mr. O'Reilly:

This facsimile confirms the conversation between Mr. A. C. Tollison, Jr. ,

General Managez;, an,! Mr.. Austin Hardin of your office at 1900 on July 16, 1980.

Carolina Power & Light Company has been informed by General Electric that the Brunswick Steam Electric. Plant (BSEP) process computer is not using the correct fuel lengths for 8 X 8, 8 X BR, and P8 X 8R fuel when calculating MTPF (see enclosure 1). The process computer uses a length of 144 inches for all fuel types whereas the 8 X 8 fuel is actually 146 inches long and the 8 X 8R and P8 X 8R are 150 inches long. When TPF'is calculated during power operation, gain adjustments are not made until TPF approaches the Technical Specification value of 2.48 (8 X 8R and P8 X SR) and/or 2.45 (8 X 8); however, the gain should have been edjusted when a value of 2.387 (8 X 8R and PS X 8R) and/or 2.425 (8 X 8) was reached. This inaccurate gain adjustment has been occurring since cycle two on Unit No. 2 and since initial startup on Unit No.1.

BSEP is revising its precedures to insure that the correct TPF reference value is used when adjusting the gain of the APRM's. This will be completed before either unit's startup. A request for a change to Technical Specifications will be submitted to correct the current Technical Specification values.

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Mr. James P.,O'Reilly, Director e July 17, 1980 l 1

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This event is being. reported under Technical Specifications 3.2.2, 6.9.1.8b.

Vdry truly yours,

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1- t A. C. To111 son, Jr., General Manager Brunswick Steam Electric Plant RMP/1th ,

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• cc: Messrs.: P. A. Hartfield

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ENCLOSURE'

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DMTPF = (MLHCR) (NBUN) (NRODS) (LF)

(RP) (CHFF)

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Where:

DMIPF = Design Maximum Total Peaking Factor MLHGR = Mcximum Linear Heat Generation Rate

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NBUN = Number of Fuel Bundles (All Types) .

NRODS = Number of Active Fuel Rods per Bundle Being Considered LF = Active Fuel Length PR = Rated Thermal Power CHFF = Cladding Heat Flux Fraction The value for "LF" in the process computer is a constant twelve feet, whereas the actual fuel length for 8x8, 8x8R, and P8x8R is greater than twelve feet.

All other values being constant, the values for DMTPF should be:

• 8x8 = 2~425 8x8R = 2.387 P8x8R = 2.387

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