ML17318A594

Ro:During Zero Power Physics Testing & W/All Rods,Withdrawn, Moderator Temp Coefficient as Function of Boron Concentration Was Conservative.Rods to Be Repositioned So Boron Concentration Is Below 1,480 Ppm

ML17318A594
Person / Time
Site:	Cook
Issue date:	01/25/1980
From:	Shaller D INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
References
NUDOCS 8002050538
Download: ML17318A594 (4)

Text

REGULA l'ORY I RblATION DISTRIBUTION SYS (RIDS)

ACCESSION NBR:8002050538 DOC ~ DATE; 80/01/25 NOTARI'lKD: NO l ACYL:50 316 Donald C.

Cook Nuclear Power Planti Onit 2i Indiana AO'fH,AA~E AuTtiuA AFFILIATIuN SHALLKNiD,V.

Indiana L Hich>gan Electric Co ~

-RFCrP;NAME RECIPIENT AFFILIATION KKPPL'FR,J,G, Beg>on 3i eRicagoi Office of the Director DOCKET 0'5000316

SUBJECT:

RO:during zero power physics testing L all rods withdrawni moderator temp coefficient as function of boron concentration was conservative. Rods to be repositioned so boron concentration is less than 1480

ppm, DISTRIBUTION CODE:

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~marlaan mom/jw a nvceff'a/II Zrzcrafc cor~saur DONALDC. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 49106 (616) 4654901 January 25, 1980 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-74 Docket No. 50-316 Dear Mr. Keppler'.

This. report is submitted as required by the Unit 2 Technical Specifica-tions, Section 6.9.2, in relation to Technical Specification 3.1.1.4, Section a.3, Moderator Temperature Coefficient.

During zero power physics testing, the "all rods withdrawn" (ARO) moderator temperature coefficient was measured to be +0.71 pcm/

F.

This value was conservatively obtained from an average of heat up and cool down measurements.

Using the slope of the moderator temperature coeffi-cient as a function of Boron Concentration (CB), it was determined that the

ARO, HZP moderator coefficient would be zero at 1494 ppm.

Operations has been instructed to so position the rods that the

'CB is less than 1480 ppm whenever the reactor is.critical.

By examining design curves for moderator coefficient as a function of burn-up, and neglecting xenon effects, it has been determined that the moderator coefficient will be negative whenever the reactor is critical after 800 Mt<D/MT.

Sincerely, D.V. Shaller Plant ihnager

/bab cc:

J.E.

Dolan R.S. Hunter R.W. Jurgensen

~

R.F. Kroeger R.W. Kilburn R.E.

Masse RO:III R.C. Callen MPSC G. Charnoff, Esq.

W. Lavallee EPRI G. Olson J.M. Hennigan PNSRC J.F. Stietzel E.L. Townley Dir., IE (20 copies)

Dir., MIPC (2 copies)

Directorate of Licensing

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