ML20054M201

Revises 791003 Response to Request for Addl Info Re Operating Bypasses & Bypass Indications,In Support of 811125 Request for Amend to License NPF-3

ML20054M201
Person / Time
Site:	Davis Besse
Issue date:	07/07/1982
From:	Crouse R TOLEDO EDISON CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
TASK-2.K.2.10, TASK-TM TAC-45184, NUDOCS 8207120091
Download: ML20054M201 (2)

Text

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TOLEDO

%ms EDISON Docket No. 50-346 name License No. NPF-3 "**""*'

Serial No. 819 July 7, 1982 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz Operating Reactors Branch No. 4 Division of Operating Reactors United States Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Stolz:

On November 25, 1981 (Serial Nc. 757), Toledo Edison submitted a license amendment request, which included the safety grade Anticipatory Reactor Trip System (ARTS) for Davis-Besse Nuclear Power Station Unit No. 1.

This amendment request was revised by our March 5, 1982 (Serial No. 787) submittal.

On October 3, 1979 (Serial No. 540) Toledo Edison responded to a staff request for additional information. Since then, operational consider-ations have dictated a need for revisions to the information contained in Attachment B of our October 3, 1979 submittal. The two revised sections should read as follows:

1. Operating Bypasses - There are two operating bypasses. The first bypass consists of blocking the turbine generator status input when the reactor power is equal to or less than 25 percent. The bypass is automatically initiated and is automatically removed when the reactor power is above 25 percent. The bypass signals are part of the protective system and originate from the Reactor Protection System (RPS).

The second bypass relates to the main feedwater pump status input when operating the unit in Mode 2. In Mode 3, during start up and at very low (approximately 1%) power levels, the electric motor driven start up feedwater pump is the only source of feedwater to () )

the steam generators. At this power there is sufficient steam THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652 8207120091 820707 PDR ADOCK 05000346 P PDR

. I Docket No. 50-346 License No. NPF-3 Serial No. 819 July 7, 1982 Page 2 i

produced to start a main feedwater pump. Following a brief overlap l of running both the start up feedpump and a main feedpump l simultaneously, the start up feedpump is stopped. The operating bypass consists of blocking the main feedwater pump trip input to the ARTS using the Test Trip Bypass. The bypass is manually initiated under administrative control just prior to stopping the main feedpump during shutdown and removed after the main feedpump is started during unit startup. This second bypass is also used in Mode 3, 4, and 5, when the ARTS is not required to be operable.

2. Indication of Bypasses - Initiation of the Test Trip Bypass will be continuously indicated at the system cabinets, the Station computer, and Control Room annunciator. Initiation of the operating bypasses will aleo be continuously indicated at the system cabinets, the Station computer, and Control Room annunciator. The bypass indication is in accordance with IEEE 279, Section 4.13 " Indication of Bypasses", if the protective action of some part of the system has been bypassed or daliberately rendered inoperative for any purpose, this fact shall be continuously indicated in the Control Room."

Very truly yours, f [YW~

RPC:FRM:TKR: lab cc: DB-1 NRC Resident Inspector

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