ML20078D451

Comments on Implementation of Recommended Independent Design Review.Design Verification Should Be Conducted in Parallel W/Verification of Const Quality

ML20078D451
Person / Time
Site:	Zimmer
Issue date:	09/12/1983
From:	Neylan A TORREY PINES TECHNOLOGY
To:	Williams J CINCINNATI GAS & ELECTRIC CO.
References
TPT:CG&E:023, TPT:CG&E:23, NUDOCS 8310040522
Download: ML20078D451 (2)

Text

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i TORREY PINES TECHNOLOGY RO. Box 85608 i$ l*"}

San Dego, Casfema 92138 Te4echore: (619) 455 2654 A o, on of GA Technologies Inc.

September 12, 1983 Project 2474 TPT:CG&E:023

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Mr. J. Williams, Jr.

Senior Vice President Cincinnati Gas and Electric Company 139 East Fourth Street '

. Cincinnati, Ohio 45202

Reference:

Letter, J. Williams, Jr. to A. J. Neylan, JW-SC-0085, August 30, 1983

Dear Mr. Williams:

~ In TPT's view, the recommended Zimmer Independent Design Review should be conducted in a manner such that the review would pro-vide adequate data for a defensible conclusion that the design of all safety-related systems is (or, is not) acceptable and in compliance with design criteria and regulatory requirements.

There are two ways, in TPT's view, that such a review could be conducted, viz.

1) In a " top down" manner as typically performed by TPT in independent design -reviews of other nuclear projects.

In such a review, the overall design process is first examined to check its adequacy. Next, the implementa-tion of the design process is assessed by checking a sample of the " paperwork." Finally, a technical assess-ment of a relatively small rep re s en ta tiv e sample of the design work is performed. The final conclusion on ade-quacy is then based on the results of these three tasks.

or

2) In a " bottom up" manner as typically performed by other organizations on other nuclear projects. In such a review, a technical assessment is performed of a statis-tically significant sample of the design work. (This would probably require sampling from more than one typical safety-related system.) Depending on the results from the initial assessment, the sample may be enlarged based on standard statistical sampling rules.

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Mr. J. Williams, Jr. TP:CG&E:023 On the second point in your letter, we concur that the design verification be conducted in parallel with the verification of the quality of construction. Of course, depending on the re-sults of the design review, there is some risk of rework.

Sincerely,

-===,

A. J. Neylan Project Manager

. Copy: Mr. J. G. Keppler - NRC - Region III '

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