ML19282C235

Util Believes That Any Unit Design & Component Fabrication Scheduled to Occur 790313 & 791101 Can Proceed W/O Affecting Reactor Backup Scram Sys,Increased Reactor Coolant Sys Pressure Relief Capacity & long-term Cooldown Valves

ML19282C235
Person / Time
Site:	Davis Besse
Issue date:	03/13/1979
From:	Roe L TOLEDO EDISON CO.
To:	Boyd R Office of Nuclear Reactor Regulation
References
NUDOCS 7903220272
Download: ML19282C235 (1)

Text

Docket Nos. 50-500 50-501 TOLEDO Serial No. 2-142 EDISON LOWELL E. ROE March 13, 1979 v.c. Presutent FacHetie, Ceveicoment (41H 259-5242 Attn: Mr. Roger S. Boyd Director of Nuclear Reactor Regulations Division of Project Management U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Davis-Besse Nuclear Power Station Units No. 2 and 3 Anticipated Transients Without Scram (ATWS)

References:

(a) NUREG-0460, Volume 3, December 1978 (b) Year letter to L. E. Roc, (Toledo Edison Co.) dated February 8, 1979

Dear Mr. Boyd:

Toledo Edison Company has reviewed reference (b) with our NSSS supplier, Babcock and Wilcox Company, and our A/E, Bechtel Power Corporation.

Based upon our current understanding of the USNRC's request, it is our position that any design and component fabrication for the Davis-Besse Nuclear Power Station Units No. 2 and 3 (DB-2&3) scheduled to occur between now and November 1, 1979 can proceed without precluding the addition of or affecting a reactor backup scram system, increased reactor coolant system pressure relief capacity and demonstration of function-ability of long-term cooldown valves as outlined in references (a) and (b).

However, it should be noted'that the final detailed requirements of the NRC are not known at this time, but are projected to be established by November 1, 1979 (reference (a)). When these regulatory requirements have been finally established, Toledo Edison Company will determine what, if any, design modifications will be made for DB-2&3.

Should the NRC increase its requiremants for the mitigation of AIWS beyond these specified in reference (b) above, or should the NRC final rule / regulations on ATWS be issued after November 1, 1979, Toledo Edison Company cannot assure that the design and component fabrication for DB-2&3 would be such so as not to preclude their addition.

Yours very truly, NH 0 LER/rRM 7903220272

'

'

9' y ks d/36 U *V THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. _MIO 43652