ML19340E991

Forwards marked-up Electrical Drawings as Update to 810105 Request to Deautomate Incident Level 5 of Safety Features Actuation Sys.Procedure Mod Details,License Amend Request & Safety Evaluation Will Follow.W/O Encl

ML19340E991
Person / Time
Site:	Davis Besse
Issue date:	01/09/1981
From:	Crouse R TOLEDO EDISON CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
676, TAC-43253, NUDOCS 8101160461
Download: ML19340E991 (6)

Text

'

,s M3LEDO

%ss EDISON Docket No. 50-346 A cs uo p c a mse License No. NPF-3 VC 7 '

1419i259-5221 Serial No. 676

'a January 9, 1981 Director of Nuclear Reactor Regulation Attention:

Mr. Robert W.

Reid, Chief Operating Reactors Branch No. 4 Division of Licensing United States Nuclear Regulatory Commission Washington, D. C.

20555

Dear Mr. Reid:

On January 5, 1981 Toledo Edison submitted (letter Serial No. 675) a package to support de-automation of Incident Level 5 of the Safety Features Actuation System (SFAS) at the Davis-Bcsse Nuclear Power Station, Unit 1 (DB-1).

Also on that day members of my staff met with you and your staff in Bethesda, Maryland to discuss this proposal for manual action to provide appropriate long term post-loss of coolant accident (LOCA) core cooling.

Several discussions have transpired since that time with your staff. As a result we have altered the proposed modification compared to the one presented on January 5, 1981. This letter transmits the electrical drawings marked up to describe the current proposed electrical changes.

Specifically, the proposed modification retains the SFAS Incident Level 5 to provide a permissive function for operator action. D2 tails of proposed procedure modifications, as well as the request for a license amendment and safety evaluation, will be revised from our January 5, 1981 submittal and will be transmitted when completed.

1 Very truly yours, WW,= - ; ^_

RPC:TJM: sic Attachments g/

cc:

DB-1 NRC Resident Inspector S

/ /

THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652 1

810118 046l p

1

Dockot Ns. 50-346 License No. NPF-3 Serial No. 676 January 9, 1981 List of Attachments 1.

Elementary E52B, Sh, 19A, B, C As-is 2.

Elementary E52B Sh. 19A, B, C As proposed 3.

E16 Sh. 1 4.

E30B Sh. 7, 8 4

1 1

i

Docket No. 50-346 License No. NPF-3 Serial No. 676 January 9, 1981 LEGEND g

I Device / Symbol Description i

l M

Motor Operated Valve (MOV) as shown in title block of elementary I

l MA Other MOV, (on sheet 19A it is sump valve. On sheet 19B it is BWST valve).

N Local Control Station B

Motor Control Center E

Junction termination box near valve C

Main Control Board CD Disconnect Switch Cabinet (the function of this switch is to disconnect controls from the main control room. This is for use when control room has to be vacated).

DS Disconnect Switch Contact (see above).

SA1, 2, 3, 4 Safety Feature Actuation System (SFAS) Cabinet CH1, 2, 3, 4.

f:[, f: [

Handswitch on Main Control Board j

j Open Close j((,33,,j((,j((

MOV limit switches (See E30B Sh 8 for operation) ac be ao bo KA, KB SFAS Level 2 output relays, contact shown in

" Relay De-energized" position, i.e. Level 2 actuated position.

KC, KD SFAS Level 5 output relays. Contacts shown in

" Relay De-energized" position, i.e. Level 5 actuated position.

TR, TR1, LL, CL1 Wire Numbers

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