ML17331A588

Suppls 800710 Response to IE Bulletin 80-11, Masonry Wall Design. Current Plant Changes Being Reviewed to Verify That All Concrete Masonry Walls Were Constructed from Architectural &/Or Structural Drawings

ML17331A588
Person / Time
Site:	Cook
Issue date:	01/14/1981
From:	Hunter R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
AEP:NRC:0418A, AEP:NRC:418A, IEB-80-11, NUDOCS 8101280510
Download: ML17331A588 (4)

Text

INDIANA II MICHIGAN ELECTRIC COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 January 14, 1981 AEP:NRC:0418A Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 Mr. James G. Keppler, Director U. S. Nuclear .Regulatory Commission Office of Inspection and Enforcement Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137

References:

1) NRC IE Bulletin 80-11; Masonry Wall Design

2) Letter AEP;NRC:0418, dated July 10, 1980

Dear Mr. Keppler:

This letter supplements our response to the above referenced IE Bulletin concerning masonry wall design at the Donald C. Cook Nuclear Plant.

In Reference 2 we reported the status of the evaluation which was partially completed at that time.

As reported earlier, none of the safety related equipment or piping systems are attached to the masonry block walls, with the exception of certain juction boxes for some of the safety-related conduits. We have reviewed all applicable architectural and structural wall drawings pertinent to the seismic class 1 buildings and structures of Cook Plant to identify all concrete masonry walls in proximity to safety related equipment. All current plant changes are being reviewed to verify that all concrete masonry walls were constructed from architectural and/or structural drawings. In addition we are in the process of conducting plant surveys to confirm our evaluation of the existence of attachments to masonry walls.

Our investigation has shown that there are no concrete masonry walls in the containment building. There is a dry stacked masonry block infill in the regenerative heat exchanger room wall but this infill is encapsulated in steel and constitutes a removable shield plug in the rein-forced concrete wall. We have located and identified one hundred fifty-six 810 188'tO CP JA~ 19 >gg

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Mr. James G. Keppler AEP:NRC:0418A (156) concrete masonry walls in the seismic Class 1 structures and buildings of the Cook Plant. Of these, one hundred thirty (130) masonry walls are located close enough to safety-related equipment or piping to be considered for potential interactions under the scope of the bulletin.

We have completed the evaluation of the seismic design of these masonry walls and have concluded that forty one (41) will require some strengthening to resist seismic loads. We are in the process of evaluating the concrete masonry walls for the effects of pipe jet forces. The final design of the required structural modifications dependsupon the outcome of our jet load evaluation.

It is anticipated that the required evaluations will be completed by April 15, 1981 and as such we are requesting an extension to the com-pletion date of the evaluation. The final report on the evaluations of the masonry block walls, and the design modifications to the block walls, will be submitted to your office by May 1, 1981.

Very truly yours, 0

. S. Hunter Vice President cc: R. C. 'Callen G. Charnoff John E. Dolan R. W. Jurgensen D. V. Shaller - Bridgman NRC Resident Inspector at Cook Plant