ML19330C242

Responds to NRC 800612 Ltr Re Violation Noted in IE Insp Rept 50-358/80-13.Discusses Provision of Necessary Design Criteria.Concludes That No Noncompliance Exists

ML19330C242
Person / Time
Site:	Zimmer
Issue date:	07/08/1980
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19330C240	List: ML19330C242
References
QA-1317, NUDOCS 8008080124
Download: ML19330C242 (2)

Text

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THE CINCINNATI GAS & ELECTRIC COMPANY sus CINCINN ATI. OHIO 4 5200

'MfS...",^,P July 8,1980 QA-1317 U. S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention: Mr. Gaston Fiorelli, Chief Reactor Construction and Engineering Support Branch RE: WM. H. ZIMMER NUCLEAR POWER STATION - UNIT I NRC INSPECTION REPORT N0. 80-13, DOCKET N0.

50-358, CONSTRUCTION PERMIT CPPR-88, W.0. f i 57300-957, JOB E-5590, i l

Gentlemen: j This letter constitutes our formal reply to the subject inspection report. It is our opinion that nothing in the report or in this letter is of a proprietary nature.

We have investigated this matter with our architect-engineer and it is our conclusion that no apparent noncompliance exists as identified in Appendix "A" of the report. The following is a summary of the information supplied by S&L for the purchase of the whip restraint bolts:

Para. 3 - The design drawing (S-432, Rev. K) specified 16 each, 1-3/8" diameter A490-F bolts for each tension leg.

The length of the bolt is determined by calculating the grip (total thickr.ess of fastened material, excluding the washers) and adding the value shown in Table 6 of the " Specification for Structural Joints Using ASTM A325 or A490 Bolts" (American Institute of Steel Construction, Manual of Steel Construction, Part 5). It is not required that the designer specify the bolt lengtn. The bolts were ordered in accordance with the design drawings and a correct length of Sk" 2 was specified on Purchase Order #15012.

A misalignment problem was discovered during installa-tion which required the addition of two 1/2" thick plates to each tension leg. Henry J. Kaiser Company ordered new A-490 bolts, 6k"a in length, with 6 threads per inch.

The length was correctly specified in accordance with 8008080/SV - JUL141980

s. .

Mr. Gaston Fiorelli g U. S. Nuclear Regulatory Conmission Region III July 8,1980 - QA-1317 Page 2 the previously referenced table. The original Sh" long bolts were supplied with 8 threads per inch which is optional for that bolt size. Although the 6h" long bolts meet the chemical requirements for corrosion resistant bolts, they are not marked as such and are not certified as such. Also, because the bolts are specified for a friction connection (A490-F) the presence of threads in the shear plane of the connection has no effect on the design capacity of the connection.

It appears, from the above, that all the necessary design criteria were provided by Sargent & Lundy in applicable design documents.

We believe that the above discussion supports our conclusion that no apparent noncompliance exists. We will be happy to discuss this and other questions with the inspector during a future visit.

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By E. A. BORGMANN

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