ML18219D958

Letter Operation of Auxiliary Feedwater System as Shared System for the Two Units

ML18219D958
Person / Time
Site:	Cook
Issue date:	04/06/1977
From:	Tillinghast J Indiana Michigan Power Co, (Formerly Indiana & Michigan Power Co)
To:	Rusche B Office of Nuclear Reactor Regulation
References
Download: ML18219D958 (12)

Text

NRC FoRM,195 iI2.76]

U,S. NUCLEAR REGULATORY COP ION NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL FILE NUMBER TO:

Mr. Benard C.

Rusche FROM:

Indiana 8 Michigan Power Company New York, N. Y.

Mr. John Tillinghast I

DATE OF DOCUMENT 4/6/77 DATE RECEIVED 4/12/77

~'TTER

&ORIGINAL Qcopv DESCRIPTION ClNOTORIZED NCLASSIFIED PROP INPUT FORM ENCLOSURE NUMBER OF COPIES RECEIVED Ltr, trans the following:

~l'jIIIItt'l@%5 Consists of information regarding the operation of the auxiliary.feedwater system as a shared system for the two units at Cook.

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)IIgg KNÃ PLANT NAME:

Cook (4-P)

(1-P)

RJL SAFETY FOR ACTION/INFORMATION ASSIGNED AD:

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INDIANA II MICHIGAN POWER COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK, N. Y. 10004 Donald C. Cook Nuclear plant Unit No.

1 Docket No. 50-315 DPR No.

58 Mr. Benard C. Rusche, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 April 6, 1977

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Dear Mr. Rusche:

This letter concerns the operation of the auxiliary feedwater system as a shaxed system fox the two units at the Donald C.

Coo'k Nuclear plant.

In the paragraphs

below, we present the system requirements and our interpretation of the applicable Appendix A Technical Specification during certain shared system operations.

The specification of interest hexe is the Limiting Condition For Operation 53.7.1.2 on page 3/4 7-5 of the Unit. 1 Appendix A Technical Specifications and its Surveillance Recpxirement N4.7.1.2.a.5 on page 3/4 7-6.

They read as follows:

3.7.1.2 "At least three independent steam generator auxiliary feedwatex pumps and associated flow paths shall be OPERABLE with:

a.

Two feedwater

pumps, each capable of being powered from separate emergency busses, and b.

One feedwater pump capable of being powered from an OPERABLE steam supply system. "

4.7.1.2.a.5 "Verifying that each valve (manual, power operated or automatic) in the flow path that is not locked,

sealed, or otherwise secured in position, is in its correct position."

The need arises for an interpretation of the word "OPERABLE" or definition of operability with xespect to the "associated flow paths" connecting the motor driven auxiliary

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Mr. B. C. Rusche ril 6, 1977 feedwater pumps (MDFP) of both units.

During certain modes of operation "valve positions" must be changed which redirect the "associated flow paths" of the auxiliary feedwater system.

These operations are:

1.

Flushing Unit 2 Auxiliary Feedwater piping while Unit 1 is operating.

2.

Unit 2 Hot Functional Testing with 0nit 1 in operation.

3.

Start up of either unit, or one unit in Hot Standby, when the other unit is in operation.

The first time we will use the auxiliary. feedwater system as a shared system is during the Unit 2 flushing operations while Unit 1 is in operation.

This flushing operation is scheduled to start within a few weeks.

The flushing of Unit 2 feedwater piping will be accomplished by flushing two Unit. 2 steam generators at one time using water from the Unit 2 condensate storage tank.

This leaves one motor driven feedpump to supply auxiliary feedwater to two Unit 1 steam generators automatically.

The Unit 1 turbine driven feedpump would also be available to supply auxiliary feedwater to all four Unit 1 steam generators simultaneously.

Should Unit, 1 be in hot standby or starting up, the turbine driven feedpump was designed to supply auxiliary feedwater to all four steam generators and may be supplemented by either motor driven feedpump.

The valve line-up utilizing the Unit 1 MDFP to flush Unit 2 steam generators No.

1 and No.

4 is:

Valve Number Position Motor operated ll II II II Manual

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3 pril 6, 1977 The valve line-up utilizing the Unit 2 MDFP to flush Unit 2 Steam Generators No.

2 and No.

3 is:

Valve Number Position Motor operated Manual Air-Operated 1-FMO-241 1-FMO-211 2-FMO-232 2-FMO-222 1-FW-122 1-CRV-51 closed closed open open open*

closed*

These valves willbe administratively controlled and tagged during flushing operations.

Should a safety injection signal be generated in Unit 1, the valves which are open to the Unit, 2 steam generators will close automatically making two MDFP s available to Unit 1.

By administratively controlling the supply valves from the Unit 2 Condensate Storage Tank (CST),

the MDFP supply can be switched over to the Unit 1 CST by an operator in less than 30 minutes

',.I following a safety injection signal in Unit 1.

This time is consistent with the accident analysis in Section 14.2.4 of the FSAR.

Also, the MDFP discharge valves to Unit 1 for the pump in service willbe opened manually from the control room.

The attached flow diagxam shows the auxiliary feedwater system and the valves involved.

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='uring the intermittent periods when flushing has been terminated and will not be restarted for a period of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or more the system valves willbe re-aligned with Unit 1 again until the next period of flushing.

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Because the valves heretofore identified to be closed for the operations described are only closed for administrative operation of this shared

system, they are available for use immediately if the need occurs.

Our interpretation is therefore that these valves are available for operation and the associated flow paths are operable.

By this interpretation we will continue to meet, the Limiting Conditions For Operation 3.7.1.2 and 3.0.4 and hence no Licensee Event Report need be submitted.

This interpretation also applies to the additional modes of operation of the auxiliary feedwater system as a shared.

system also described herein.

Based on our telephone discussions with the NRC staff

• The positioning of these valves allows water to be drawn from the Unit 2 CST and will not impact the Unit 1 CST.

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Mx. B. C. Rusche April 6, 1977 and unless we hear from you otherwise, we will assume that this interpretation of Technical Specifications and reporting requirements is acceptable.

Very truly yours, JT:mam John i linghas

.Vice Presiden Sworn and subscribed to before me this 6th day of April 1977 in New York County, New York Notary Public KATHLEENDAPRY NOTARY PUBLIC, State of Now York No. 414G06 J92 Quafified in Queens County Certificate filed in Nrrw York Counttf'onnrussion Expires March 30, 197rI cc:

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