DCL-02-067, Comments of James E. Tomkins on Draft Report NUREG-XXX, Technical Assessment Generic Issue 186: Potential Risk & Consequences of Heavy Load Drops in Nuclear Power Plants.

Comments of James E. Tomkins on Draft Report NUREG-XXX, Technical Assessment Generic Issue 186: Potential Risk & Consequences of Heavy Load Drops in Nuclear Power Plants.

ML021710568
Person / Time
Site:	Diablo Canyon
Issue date:	05/31/2002
From:	Tomkins J Pacific Gas & Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
DCL-02-067
Download: ML021710568 (2)

Text

WEPacific Gas and Electric Company Diablo Canyon Power Plant P.O.Box 56 Avila Beach, CA 93424 805.545.6000 May 31, 2002 PG&E Letter DCL-02-067 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units I and 2 Comments on Draft Report NUREG-XXXX, "Technical Assessment Generic Issue 186: Potential Risk and Consequences of Heavy Load Drops in Nuclear Power Plants"

Dear Commissioners and Staff:

The purpose of this letter is to provide comments regarding draft report NUREG-XXXX, "Technical Assessment Generic Issue 186: Potential Risk and Consequences of Heavy Load Drops in Nuclear Power Plants," transmitted by NRC letter dated April 1, 2002.

The NRC letter requested a review of the draft NUREG to verify the accuracy of the data and information collected from Diablo Canyon Power Plant (DCPP).

PG&E has reviewed the information in the draft NUREG report, and has found one discrepancy in the information regarding DCPP. The entry in Table Al for DICI for June 1993 is a duplicate of the DIC1 entry for April 1993. These entries correspond to the same event reported in two revisions of LER 1-92-029. As a result, the DIC1 entry for April 1993 should be deleted from Table Al and all graphs and calculations including this entry as a crane event should be revised accordingly.

For example, the total number of crane issues per licensed unit for DCPP should be reduced from 5 to 4.5 in Figure 11 of the draft NUREG report. Also, the remaining entry in Table Al for DICI for June 1993 should be coded "NON" for Category 3 as opposed to "COMP," since no crane component issue was associated with this event.

It was also noted that the "COMP" column in Table Al is not consistently described in the document. It appears to be part of "Category 3" in Table Al, and is referred to on pages 10, 11, 12, but is not included in Table 1 on page 6 or under the Category 3 issues on page A-1 of the Appendix.

Thank you for the opportunity to verify the input data to the draft NUREG.

A member of the STARS (Strategic Teaming and Resource Sharing) Attiance Cautaway

• Comanche Peak aDiabto Canyon aPalo Verde

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Document Control Desk PG&E Letter DCL-02-067 May 31, 2002 Page 2 of 2 Please contact Mr. Pat Nugent at (805) 545-4720 if you have any questions.

Sincerely, Sames E. Tomkins

/ Director, Nuclear Quality, Analysis and Licensing nih cc: Diablo Distribution Mike Gibbons Richard Hagler Jeff Portney John A. Zwolinski A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Ca~taway a Comanche Peak 9 DiabLo Canyon e Palo Verde e South Texas Project

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