ML17325A985
| ML17325A985 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/26/1988 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Murley T NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| AEC:NRC-1059, NUDOCS 8811020285 | |
| Download: ML17325A985 (7) | |
Text
ACCELERATZD DISIRIBUTION DEMONSTRATION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8811020285 DOC.DATE: 88/10/26 NOTARIZED:
NO DOCKET FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, Indiana 05000315 50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Indiana 05000316 AUTH.NAME AUTHOR AFFILIATION ALEXICH,M.P.
Indiana Michigan Power Co. (formerly Indiana
& Michigan Ele, RECIP.NAME RECIPIENT AFFXLIATION MURLEY,T.E.
Document Control Branch (Document Control Desk)
SUBJECT:
Responds NRC concerns re NRC Bulletin 88-'009, "Thimble Tube Thinning in Westinghouse Reactors."
DISTRIBUTION CODE: IE19D COPIES RECEIVED:LTR ENCL SIZE TITLE: Part 21 Rept (50 DKT)
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NOTE I0 ALL "RIDS" RECIPIENTS:
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Indiana Michigan Power Company P.O. 8ox 16631 Columbus, OH 43216 R
AEP:NRC:1059 Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
License Nos.
DPR-58 and DPR-74 Docket No. 50-315 and 50-316 THIMBLE TUBE THINNING ISSUE U.S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C.
20555 Attn:
Dr. T. E. Murley October 26, 1988
Dear Dr. Murley:
This letter responds,to your staff's concerns regarding thimble tube thinning as expressed',;in: NRC:Bulletin No. '88-09 dated July. 26, 1988, titled,."Thimble Tube.Thinning in Westinghou'se Reactors."
Upon the advice in NRC Information Notice 87-44, dated September 16,
- 1987, we performed an eddy current inspection of the thimble tubes at Cook Nuclear Plant Unit 2 at the first opportunity in April/May 1988.
The results, which were presented to the NRC in a July 18, 1988 meeting, indicated a thinning of sufficient magnitude to warrant replacement of all the tubes.
Because of the long lead time associated with the procurement, we ordered 116 new tubes, a sufficient number to replace all 58 thimble tubes in both Unit 1 and Unit 2.
Our plan is to replace the thimble tubes during the current, Unit 2 outage (steam generator replacement).
The Unit 1 tubes are scheduled to be replaced during the Spring 1989 refueling outage.
After the new tubes are installed, we intend to perform an eddy current examination in both units.
This will establish baseline data that may be used for comparison with data from future examinations.
During.the first refueling>>.outage, subsequent to the..inst'allation, currently scheduled'for,August 1990 for Unit-2 and*Novemb'er.
1990 for Unit 1, we intend to 'eddy current inspect all'58 tubes'n each unit.
The data obtained will be compared to the respective SSii0202S5 SS1026 PDR ADGCK 05000315 o
tp It t
J tII <<f I', i E
Dr. T. E. Murley AEP:NRC'1059 baseline
- data, and the results of these comparisons will be used to help establish individual inspection and trending programs for each unit.
These programs will specify the frequency of future thimble tube inspections, the acceptance criterion, and corrective action required.
The programs will be submitted to your staff, in writing, within 60 days of receipt of the analyzed data from the eddy current inspection consultant.
The programs will allow for changes in the frequency of testing as well as changes in the acceptance criterion.
More or less frequent testing will be determined by the condition of the tubes.
These changes may be made to reflect a trend observed in the eddy current data, or some updated information regarding this issue.
Any changes made to either program will be reported to your staff, in writing, within 60 days of the change.
A summary of our plan to establish thimble tube inspection programs and approximate dates of implementation is given in.
This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to ensure its accuracy and completeness prior to signature by the undersigned.
Sincerely, M.
. Ale ich Vice President MPA/pd Attachment cc:
D. H. Williams, Jr.
W.
G. Smith, Jr.
- Bridgman R.
G. Callen G. Charnoff A. B. Davis NRC Resident Inspector
- Bridgman G. Bruchman
Attachment to AEP:NRC:1059
Attachment to AEP:NRC:1059 Attachment 1
CURRENTLY SCHEDULED DATE 1)
Replace thimble tubes in Unit 2 and baseline eddy current.
1/89 2)
Replace thimble tubes in Unit 1 and baseline eddy current.
4/89 3)
Eddy current test Unit 2 tubes at first refueling outage.
4)
Submit Unit 2 thimble tube testing program.
5)
Eddy current test Unit 1 tubes at first refueling outage.
6)
Submit Unit 1 thimble tube testing program.
8/90 11/90 11/90 2/91
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