ML17319A516

Forwards Reply to IE Bulletin 80-11 Re Masonry Wall Design. Structural Integrity Evaluation of Masonry Walls Is Underway.Full Evaluation Will Be Completed

ML17319A516
Person / Time
Site:	Cook
Issue date:	07/10/1980
From:	Maloney G INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
AEP:NRC:00418, IEB-80-11, NUDOCS 8007230269
Download: ML17319A516 (62)

Text

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INDIANA L MICHIGAN ELECTRIC COMPANY P. O. BOX 18 BO WLIN G GR E EN ST ATION NEW YORK, N. Y. 10004 July 10, 1980 AEP'NRC:00418 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, Regional Director U.S. Nuclear Regulatory Commission Office of the Inspection and Enforcement Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 REF.: NRC IE BULLETIN 80-11; MASONRY WALL DESIGN

Dear Mr. Keppler:

The attachment to this letter responds to the above referenced bulletin on Masonry Wall Design at the Donald C. Cook Nuclear Plant, Units 1 and 2. This is a partial response to Items 1, 2a, and'.3 of the bulletin. The structural integrity evaluation of the masonry walls is underway and it is anticipated that the full evaluation as called for in the bulletin will be completed within the schedule outlined in the bulletin. After the final listing/evaluation is completed, a plant survey will be done to assure that all the masonry walls, whose failure may affect the performance of a safety-related system, are considered.

The responses in the attachment correspond to the items as cited in the bulletin.

Very truly yours,

. P. Malo e Vice Pres d t GPM/emc Attachment cc: R. C. Callen G. Charnoff John E. Dolan R. S. Hunter R. W. Jurgensen D. V. Shaller - Bridgman so ogss o 2le

ATTACHMENT TO AEP: NRC: 00418 ITEM 1 All masonry walls at the Donald C. Cook Nuclear Plant have been identified. At this time, we have identified one hundred and twenty-seven {127) of these walls as being in proximity to or as having attachments from safety-related piping or equipment. These walls were identified as per the criteria defined in Item 1 of the bulletin and are listed in Table 1. A preliminary review of these walls show that:

- There are no attachments from safety-related piping to any of the masonry block walls.

- There are no safety-related instruments attached to or supported from any of the masonry block walls.

- There are no electrical cable trays attached to or supported from the block walls.

However, a portion of the safety-related instrument tubing and switches or junction boxes for the safety-related conduits are attached to some of the masonry walls.

ITEM 2 a All of the block walls in proximity to safety-related piping or equipment and all of the block walls having attachment from safety-related items as stated above, will be re-analyzed considering the effects of seismic, missiles and jet forces from High Energy Lines.

Breaks in the High Energy Lines will be considered to occur at the most severe locations relative to the block walls. Breaks in the piping systems will be postulated in accordance with Appendix 0 of the FSAR.

The priority established for the re-evaluation of the walls is:

1. Analyze all block walls listed in Table 1 for seismic adequacy considering both OBE 8 DBE.

2. Analyze all block walls listed in Table 1 for response to possible jet forces from High Energy Lines if the direction of the jet would be to fail the wall or a segment of the wall in the direction of a safety-related item.

Attachment AEP: NRC: 00418

3. Analyze all'block walls listed in Table 1 for ability to resist missile impact if the direction of the impacting force is such that it could cause failure of the wall- or segment of the wall in the direction of a safety-related item.

ITEM 3 For the evaluation of- the masonry block walls, the following preliminary criteria will be considered:

a. Duro-wall* reinforcement placed in the horizontal joints ss considered to resist moment and shear force for wall horizontal spans.

b. Only the strength of mortar joints is considered to resist the loading for wall vertical spans.

c. When walls have been constructed 'of multiple wythes:

1. Where .Duro-wall reinforcing has been used as a continuous bond between two wythes, then for horizontal spans the wall shall be considered to be two (2) wythes thick. For the vertical span the strength of the wall is considered to be a multiple of .the strengths of single wythe walls.

2. Where Duro-wall reinforcing has not been used, as in some of the knock-out panels, then for both horizontal and vertical directions of wall spans, the wall. strength shall be considered to be that of a single wythe wall multiplied by the number of wythes composing the wall.

d. Based on. the criteria defined above, Items a, b, and c, the stresses in the wall will be determined for each loading condition as discussed in the bulletin. The evaluation will be based on low allowable stress value, such that this will result in a maximum number of possible problems under the most conservative criteria.

• Trade Name

. ATTACHMENT TO AEP:NRC:00418 TABLE 1

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