ML18043A896

Request for Change to Tech Specs of License DFR-20 Re Auxiliary Feedwater Sys Operability

ML18043A896
Person / Time
Site:	Palisades
Issue date:	07/31/1979
From:	Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18043A894	List: ML18043A893 ML18043A896
References
TASK-10, TASK-RR NUDOCS 7908030430
Download: ML18043A896 (4)

Text

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CONSUMERS POWER COMPANY Docket 50-255 Request for Change to the Technical Specifications License DPR-20 For the reasons hereinafter set forth, it is requested that the Technical Specifications contained in Provisional Operating License DPR-20, Docket 50-255, issued to Consumers Power Company on October 16, 1972 for the Palisades Plant be changed as described in Section I below:

I. Change ( s)

A. Change Section 3.5.1.a to read:

f "a. Both auxiliary feedwater pumps operable and one fire pump operable."

B. Add new Section 3.5.2:

"3.5.2 With the primary coolant system at a temperature greater than

• 325°F, .the requirements of 3.5.1 may be modified to permit the following conditions to exist. If the system is not restored to meet the requirements of 3.5.1 within the time period speci-fied below, the reactor sha,1.1 be placed in th.e cold shutdown*

condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

a. One auxiliary feed-water pump may be inoperable for a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

o.

• The firewater makeup to the auxiliary feed.water pump suction may.be inoperable for a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />."

C. Add new Section 3.5.3:

3.5.3 With both aillciliary feedwater pumps inoperable, reduce power within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to the lowest stable power level consistent with reliable main feedwater system operation.

II. Discussion This Technical Specifications change provides for greater reliability of the auxiliary feedwater system. It was requested by the NRC and fulfills the requirements specified in the Safety Evaluation Report for Amendment No 42 to the Palisades operating license.

III. Conclusion(s)

Based on the foregoing, both the Palisades Plant Review Committee and the Safety and Audit Review Board have reviewed these changes and find them acceptable.

'7908080~3(}

2 CONSUMERS POWER COMPANY

&!:::> D&d}£[T R B DeWitt, Vice President Production & Transmission Sworn and subscribed to before me this 31st day of July

• 1979.

~~u~i Jacksori County, Michigan My commission expires March 26, 1983

3.5 STEAM AND FEEDWATER SYSTEMS.

Ap:plicability Applies to the operating status of the steam and feedwater systems.

Objective.

To define certain conditions of the steam and feedwater system neces-sary to assure adeqµate decay heat removal.

Specifications 3.5.1 The primary coolant shall not be heated above 325°F unless the follow-ing conditions are met:

a. Both auxiliary feedwater pumps operable and one fire pump operable.

b. A minimum of 100,000 gallons of water in.the condensate storage and primary coolant system makeup tanks combined and a backup source of additional water from Lake Michigan by the operability of one of the fire protection pumps.

c. All valves, interlocks and piping associated with the above com-po.nent$ required to .function during accident conditions, are operable*.

d. The main steam stop valves are operable and capable of closing in five seconds or less under no-flow conditions.

3.5.2. With the primary coolant system at a temp~rature greater than 325°F, the requirements of 3,5.1 may be modified to permit the following conditions to exist. If the system is not restored t6 meet the require-ments of 3. 5 .1 within the time period specified below, the reactor .

shall be placed in the cold shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

a. One auxiliary feedwater pump may* be inoperable. for a period of

.72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

b. The firewater makeup.to the auxiliary feedwater pump suction may be inoperable for a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

3. 5. 3 With both auxiliary feedwater pumps .inoperable, reduce power within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to the lowest stable power level consistent with reliable main feedwater system operation.

3-38

3. 5 STEAM AND FEEDWATER SYSTEMS (Contd)

Basis A reactor shutdown from power requires removal of core decay heat.

Immediate decay heat removal requirements are normally* satisfied by the steam bypass to the condenser. Therefore, core decay heat can be continuously dissipated via the steam bypass to the condenser as long as feedwater to the steam generator is available. Normally, the capability to supply feedwater to the steam generators is pro-vided by operation of the turbine cycle feedwater system.

In the unlikely event of .complete loss of electrical power to the station, decay heat removal is by steam discharge to the atmosphe~e via the main steam safety valves or power-operated relief valves.ll,2)

Either auxiliary feedwater pump can supply sufficient feedwater for removal of decay heat from the plant. The minimum amount of water in the condensate storage tanks is the amount needed for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> of such operation. If the outage is more than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, Lake Michigan water can be used, by utilizing a fire pump to supply water to the auxiliary feedwater pump suction.

Three fire pumps are provided, one motor-driven and two diesel-driven, each capable of delivering 1500 gpm at 125 psig. In the event all feed pumps should become inoper~ble, the fire pumps could be. used

• to pump lake water to the steam generators once the secondary pres-sure was reduced sufficiently by means of the steam dump valve. A closure time of 5 seconds for the main steam stop valves is con-sidered adequate and was selected as being consistent with expected response time for instrumentation as detailed in the steam line break incident analysis. (3)

• References (1)

( )FSAR, Section 4.3.4 2

( )FSAR, Section 14.13.1 3 FSAR, Section 14.14 3-39