ML17317B338
| ML17317B338 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 07/16/1979 |
| From: | Hunter R INDIANA MICHIGAN POWER CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:00212, AEP:NRC:212, NUDOCS 7907230365 | |
| Download: ML17317B338 (6) | |
Text
REGULATORY INFQRNATIQN DISTRIBUTION SYSTEN (RIDS)
ACCESSION NBR: 7'F07230365 DQC. DATE: 7'P/07/16 NOTARI ZED:
YES DOCKET FAG IL:50-315 Donald C.
Cook Nuclear Power Planti Unit ii Indiana 1x 05000315 AUTH. MANE AUTHOR AFFILIATION HUNTER'S R. S.
Indiana 5 Nichigan Power Co.
REC IP. NANE RECIPIENT AFFILlATIQN DENTQNi H. R. Office of Nuc lear Reactor Regulation
SUBJECT:
Updates 781220
- 8. 790418 ltrs re placement of. fuel assemblies, for Cycle
- 4. Discusses changes due to damage to Exxon Nuclear fuel assemblies during refueling outage 9x reinsertion of tao assemblies into core.
DISTRIBUTION CODE:
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TITLE:
GENERAL DlSTRIBUTlQN FOR AFTER ISSUANCE QF OPERATING LIC NOTES:
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TOTAL NUNBER OF COPIES REQUIRED:
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INDIANA Ia MICHIGAN POWER COMPANY P. 0. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 July 16, 1979 AEP:NRC:00212 Donald C.
Cook Nuclear Plant Unit No.
1 Docket No. 50-315 License No.
DPR-58 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington,. D. C.
20555
Dear Mr. Denton:
II<IlItI~1'OII~IIIII,'KBg [ I,'IIII(
This letter contains information to update our letters of April 18, 1979 (AEP:NRC:00151A) and December 20, 1978 '(AEP:NRC:00108) which described the placement of fuel assemblies in the Donald C.
Cook Nuclear Plant Unit 1 for Cycle 4.
Due to the damage of two Exxon Nuclear Company (ENC) fuel assemblies during the refueling outage, two previously exposed Westinghouse assemblies were reinserted into the core.
The changes made were as follows:
1.
Assembly D19 which had contained a secondary source has been replaced by Assembly A06 which does not contain a source in core location C8, 2.
Assembly D41 which had contained a secondary source has been replaced by Assembly A16 which does not contain a source in core location" N8, 3.
A new secondary source has been placed in Assembly F37 in core location P9, 4.
The secondary source from Assembly D41 has been placed in Assembly
. F34 in core location B7.
The replacement assemblies were selected so as to minimize the impact on the cycle neutronic characteristics.
ENC has evaluated the effect on core neutronics of the changes a'nd found that the change in relative power distribution is expected to be about 2.5/ in the affected locations.
The power peaking factors are changed by less than 1Ã.
Finally, the assembly interchange is calculated to change the control rod worth of banks A, B, C, and D by a maximum of 4 pcm.
On this basis, Exxon has concluded that the neutronic parameters of the core are essentially unaffected by the changes.
ENC's analysis has also concluded Og
~9 0 72 303&s
,n
Mr. H. R. Denton, Director AEP:NRC:00212 that the original safety analysis (1) performed for Cycle 4 operation is still applicable.
The use of'he secondary source removed from Assembly D41 was judged to be acceptable by Westinghouse Corporation based on favorable results of dye penetrant and drag force check tests.
We do not plan to perform any revised ECCS analysis with respect to the two Westinghouse assemblies now being used in Cycle 4 because the previously submitted analysis for Unit 1 is conservative.
These conservatisms have been discussed in detail in our letter of January 24, 1979,(AEP:NRC:00136).
This event was described in IE Information Notice No. 79-17 "Source Holder Assembly Damage From Misfit Between Assembly and Reactor Upper Grid Plate".
The safety implications of this occurrence and its remedy were reviewed by AEPSC's NSDRC and their review concluded that this eventdi.d,notdeleteriously impact the health and safety of the public.
Very truly yours,
,RSH/emc Sworn"an) subscribed to before me
,this'/4 day of July, 1979 in
, N& Y rk County, ew Y rk Notary Publ ic R. S. Hunter Vice President DAVID G. HUME NOTARY PUBLIC, State of Now York No. 60 4608113 Qualified in lvostchostor County Certificate filed in Now York County Commission Expires March 30, 1981 (1) M. R. Killgore, "D. C.
Cook Unit 1, Cycle 4 Safety Analysis Report, XN-NF-78-10n Exxon Nuclear
- Company, February 23, 1979.
cc:
R.
C. Callen G. Charnoff D. V. Shaller - Bridgman R.
W. Jurgensen
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