ML17318A595
| ML17318A595 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 01/25/1980 |
| From: | Shaller D INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8002060566 | |
| Download: ML17318A595 (4) | |
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REGULATORY ORMATION DISTRIBUTION SY M (BIDS)
SUBJKCT: Submits -zero power physics testings all rods withdrawn"
" modei ator temp coeff-icient measured t0.71pcm/F,Average'alue was conservatively obtained from heatup L coofdown measure~ants.,
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/'lsc crla II'VDIAIJA8 blICHIGANEIECmIC CONPAlVY DONALDC. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, b1ichigan 49106 (616) 465-5901 January 25, 1980 t
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'.
l 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During zero power physics testing, the "all rods withdrawn" (ARO) moderator temperature coefficient was measured to be +0.71 pcm/ F.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 wi11 be negative whenever the reactor is critical after 800 MJD/MT.
Sincerely,.
D.V. Sheller Plant Manager
/bab CC:
J.E.
Dolan R.S. Hunter R.W. Jurgensen R.F. Kroeger R.N. Kilburn R.E.
Masse RO:III R.C. Callen MPSC G. Charnoff, Esq.
'H. Lavallee EPRI G. Olson J.M. Hennigan PNSRC J.F. Stietzel E.L. Townley Dir., IE (20 copies)
Dir., MIPC (2 copies)
'irectorate of Licensing
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