ML18219B545

D.C. Cook - Licensee Event Report Concerning, All Rods Withdrawn, Moderator Temperature Coefficient, for Unit 2

ML18219B545
Person / Time
Site:	Cook
Issue date:	03/21/1978
From:	Shaller D American Electrtic Power System, Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	James Keppler NRC/RGN-III
References
Download: ML18219B545 (3)

Text

0 REGULATORY INFORMATION DISTRIBUTION SYSTEM <RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-316 REC: KEPPLER J G ORG: SHALLER D V DOCDATE: 03/21/78 NRC IN h MI PWR DATE RCVD: 03/28/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 0 LICENSEE EVENT REPT (RO 50-316f00-000) ON 01/01/01 CONCERNING DURING ZFRO PWR PHYSICS TESTING THE "ALL RODS WITHDRAWN" MODERATOR TEMPERATURE COEFFICIENT WAS MEASURED TO BE PLUSS i. 3 PCM/DEGREES F.

PLANT NAME: COOK UNIT 2 REVIEWER INITIAL: XJM DISTRIBUTOR INITIAL:

DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS NOTES:

1. SEND 3 COPIES OF ALL MATERIAL TO ISE INCIDENT REPORTS

<DISTRIBUTION CODE A002)

FOR ACTION: ONLY(4)

INTERNAL: R PXL~QTR ONLY<i) NRC PDR44LTR ONLY< 1)

I 0 E4+LTR MIPC4 +LTR ONLY(3)

IPPOLITO44LTR ONLY( 1) HOUSTON+~LTR ONLY(i)

QNViY2'CHROEDER/

NOVAK/CHECK++LTR ONLY(i> GRIMES++LTR ONLY(1)

KNIGHT4~4LTR ONLY< 1) BUTLER44LTR ONLY<1)

HANAUER++LTR ONLY(i> TEDESCO++LTR ONLY(i>

EISENHUT++LTR ONLY(i) BAER++LTR ONLY<i)

SHAO+~LTR ONLY(1> VOLLMER/BUNCH+4LTR ONLY(i>

KREGER/J. COLLINS44LTR ONLY( 1) ROSA++LTR ONLY(i)

K SEYFRIT/IE++LTR ONLY(1>

EXTERNAL: LPDR S ST. JOSEPH'I44LTR ONLY( 1)

TIC++LTR ONLY(1)

NSIC44LTR ONLY< 1)

ACRS CAT B++LTR ONLY(16)

COPIES VOT SUB fITTED PER REGULATORY GUIDE 10. 1 DISTRIBUTION'TR 45 ENCL 0 CONTROL NBR: 780900006 SI ZE: 1P THE FND

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",(" INDIANA 8f NICHIGANPOWER CONPANY DONALD C. COOK NUCLEAR PLANT P.o. Box 458, Bridgman, Michigan 49106 (616) 4654901 Harch 21, 1978 Operating License DPR-74 Docket 8 50-316

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//fp lir. J. G. Keppler, Regional Director -

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Office of 'Inspection and Enforcemen't

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U. S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Ellyn, Ill. 60137

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Dear Hr. Keppler:

This report is submitted as required by Unit-2 Technical Specifications, Section 6.9.2 in relation to Technical Specification 3.1.1.4 Section a.3.,

Hoderator Temperature Coefficient.

During zero povler physics testing the "all rods withifrawn" (ARO) moderator temperature coefficient was measured to be +1.3 pcm/ F. This value- was conservatively obtained from an average of heat up. and cool down measure-ments. Using the slope of the ARO moderator temperature coefficient as a function of Boron Concentration (CB ) it was determined that the ARO moderator coefficient would be zero at 1200 ppm., Therefore operations has been instructed to so position the rods that the CB is less than 1200 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 2500 Hl,'D/HT.

D. V. Shaller Plant Hanager

'f780900006 cc: R. H. Jurgensen R. Halsh, Esq.

J. E. Dolan G. Olson f7 R. Kilburn J. Stietzel lkdf G. E. Lien PNSRC File R. J. Vollen, BPI G. Charnoff, Esq.

K. R. Baker,'O:III J. H. Hennigan P. M. Steketee, Esq. Dir, IE (20 copies)

R. C. Callan Dir, HIPC (2 copies)

R. S. Kei th