ML20195E593

Discusses Util ATWS Design Requirements & Implementation Schedule.Util Plans to Design & Install ATWS Sys by End of Sixth Refueling Outage

ML20195E593
Person / Time
Site:	Davis Besse
Issue date:	10/31/1988
From:	Shelton D TOLEDO EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1607, TAC-59086, NUDOCS 8811080312
Download: ML20195E593 (2)

Text

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.s TOLEDO EDISON A Cetnr Emg, Ca m DONALD C. SHELTON w.% ww Docket No. 50-346 License No. NPF-3 l Serial No. 1607 I October 31, 1988 '

tJnited States Nuclear Regulatory Commission [

Document Control Desk Vashington, D. C. 20555 ,

Subject:

Davis-Besse ATVS Design Requirements and Implementation Schedule (TAC 59086)  :

Gentlemen (

l The NRC requested Toledo Edison Company (TE) to address ATVS design  !

requirements and provide the schedules for installation of required equipment  !

no later than October 30, 1988, by letter dated August 10, 1988 (Log No.

2664). This request was apparently prompted by the completion of the NFC staff's evaluation of the Babcock and Vilcox Ovners Group (BV0G) generic design requirements report which was submitted to the NRC by letter dated  ;

October 9, 1985. The NRC's generic safety evaluation report (SER) issued on August 10, 1988 concluded that most sections of the BV0G report vere 7 acceptable for providing generic guidelines for plant-specific design '

submittals. However, some areas of the generic design vere still of concern  !

to the staff.  ;

The BV0G met with the NRC Staff on August 17, 1988, in an attempt to arrive at  !

a common understanding of all areas needed to implement the ATVS rule. During i the meeting, BV0G members expressed general agreement with the NRC SER l conclusions with the exceptions of power supply independence requirements.

- After the nV0G presentation on power supply independence, the NRC provided i clarification on various acceptable design options that would resolve the l 4 issue. These design options were described in an NRC letter to Mr. L. C.  :

., Stalter, Chairman BVOC/ATVS Committee dated September 7, 1988. [

8 =j 6 g Currently, TE plans to implement option 2 which includes a non-battery backed j c2o power supply for the Diverse Scram System (DSS) and an evaluation that the j eq Steam Feedvater and Rupture Control System (SFRCS) meets the requirements of i

@ the ATVS Mitigation Actuation Circuitry System (AMSAC). TE is currently in l 05 the process of defining plant-specific design requirements for the DSS and e

$T AMSAC. Due to the current refueling outage TE has been unable to devote the

,, manpover nec.essary to complete ATVS system design requirements by 38 M o.

October 30, 1988.

THE TOLEDO ED' SON COWW ED! SON PLAZA 300 MAD: SON AVENUE TOLEDO. OHO 43652

$ _ _N

Dockot No. 50-346

, License No. NPF-3 Serial No. 1607 Page 2 TE staf f discussed the above with Mr. A. V. DeAgazio (DB-1 NRC Senior Project Manager) on October 21, 1988, and requested an extension to the submittal due date, Mr. DeAgazio agreed to an extension and requested TE to document the request by letter. TE vill provide a response which addresses ATVS design requirements no later than February 28, 1989. Currently, TE plans to design and install ATVS systems by the end of the 6th Refueling Outage.

Should you have any questions regarding the information, please contact Mr. R.

V. Schrauder, Nuclear Licensing Manager, at (419) 249-2366.

Very truly yours,

~

/

EBS/dlm cci P. Byron, DB-1 NRC Resident Inspector A. V. DeAgazio, DB-1 NRC Senior Project Manager A. B. Davis, Regional Administrator, NRC Region III