ML20043C818

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Forwards Rev 1 to Core Operating Limits Rept,Dresden Station Unit 2,Cycle 12. Rev Reflects MCPR Limit Adjustment for Cycle 12 Due to Number of Reused Channels,Per Discussion of Channel Bow Effects in BWRs in NRC Bulletin 90-002
ML20043C818
Person / Time
Site: Dresden Constellation icon.png
Issue date: 05/30/1990
From: Silady J
COMMONWEALTH EDISON CO.
To: Murley T
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
Shared Package
ML17202L260 List:
References
1036T, IEB-90-002, IEB-90-2, NUDOCS 9006060218
Download: ML20043C818 (3)


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/D) 1400Commonwealth Opus PlaceEdison ,

Downers Crove, Illinois 60$15  ;

May 30, 1990 Dr. Thomas E. Murley, Director  ;

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Conunission '

Idashington, D.C. 20555 ATTN: U.S. NRC Document 00ntr61 Desk Subjectt Dresden Nuclear Power Station Unit 2 Revision 1 of the Unit 2 Cycle 12 Core Operating Limits Report NRC_DockeLNo2 50-237 _

Referencest (a) Ceco letter f rom M.II. Richter to U.S. NRC *

(Document Control Desk) dated April 26, 1990.

(b) CECO letter from J.A. Silady to T.E. Murley dated February 5, 1990.

, s Dr. Murley:

Commonwealth Edison (CECO) recently completed a review of NRC .

Bulletin 90-02 which discussed the effects of channel bow in Boiling Water '

Reactors. Because of the number of reused channels in Dresden Unit 2 Cycle 12 It was necessary to implement an adjustment to the MCPR operating limit. This was previously discussed in Reference (a) which provided the Ceco response to Bulletin 90-02 for all six Ceco BWRs.

CECO committed in Reference (a) to submit, by May 31, 1990, a revised Core Operating Limits Report (COLR) to reflect the MCPR limit adjustment for Dresden 2 Cycle 12 (D2012). Attachment t to this lettet, therefore, provides Revision 1 to the D2012 COLR incorporating the MCPR adjustment. -In other respects Attachment 1 is the same as the COLR initially losued for D2012 in Reference (b).

Attachment 2 provides a safety evaluation which, for completeness, again describes the basis for the MCPR adjustment. As indicated in Reference (a), since your staff is continuing to review the fuel vendor generic channel bow methodology, your concurrence is requested with this interim approach for adjusting the Dresden 2 MCPR operating limit.

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Dr. T.E. Murley May 30, 1990 t

Please contact this office should further information be required.

Very truly yours, _

s J. A. Silady 'l Nuclear Licensing Administrator Attachments (2) t cc A.B. Davis - Regional Administrator, RIII P.L. Eng - Project Manager NRR S.C. DuPont - Setfor Resident Inspector, Dresden D.B. Fieno - Reactor Systems Branch, NRR

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