ML20066B654

Application to Amend License NPF-3,changing Time within Which Unit Must Be Placed in Hot Standby After Plant Goes Outside Bounds of Action Statement

ML20066B654
Person / Time
Site:	Davis Besse
Issue date:	11/05/1982
From:	Crouse R TOLEDO EDISON CO.
To:
Shared Package
ML20066B646	List: ML20066B644 ML20066B654 ML20066B663
References
TAC-43038, NUDOCS 8211090119
Download: ML20066B654 (3)

Text

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I' APPLICATION FOR AI:ENDMENT TO FACILITY OPERATING LICENSE NO.'NPF-3 FOR DAVIS-BESSE NUCLEAR POWER STATION UNIT NO. 1 ,

Enclosed are forty-three (43) copies of the requested changes to the Davis-Besse Nuclear Power Station Unit No. 1 Facility Operating License No. NPF-3, together with the Safety Evalution for the requested change.

The proposed changes include Section 3.0.4, 4.0.4 and Bases.

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By /s/ R. P. Crouse Vice President, Nuclear Sworn and subscribed before me this 5th day of November, 1982.

o Laurie A. Hinkle, nee (Brudzinski)

Notary Public , - State of Ohio My Commission Expires ' fay 16, 1986' a

SEAL B211090119 821105 '

PDR ADOCK 05000346

,P PDR . . .

Docket No. 50-346 License No. NPF-3 Serial No. 8/2 November 5, 1982 Attachment I. Changes to Davis-Besse Nuclear Power Station Unit 1 Appendix A Technical Specifications Section 3.0.4, 4.0.4 and Bases.

A. Time required to Implement. This change is to be effective upon NRC approval.

B. Reason for Change (Facility' Change Request 82-158A)

In response to Mr. J. F. Stolz-letter dated October 13, 1982

.(Log No. 1112).

C. Safety Evaluation (See attached) l l

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SAFETY EVALUATION This amendment request changes two Sections, 3.0.3 and 4.0.3, of the

, Davis-Besse (DB). Technical Specifications. The safety function of Section 3.0.3 is to provide for a shutdown of the unit, if, required, due to equipment inoperability that places the plant both outside the limiting condition for operation and the applicable action statement.

The DB Technical Specifications currently require the unit to be placed in-hot standby (Mode 3) within one hour of the time the plant goes outside the bounds of the action statement. If the plant is operating at-high power levels, it cannot be shutdown in a controlled manner within one hour. Compliance with the one hour requirement, therefore, places a

, potential challenge to safety that the Technical Specification Limiting Conditions for Operation and the Action Statements are designed to-prevent. The~B&W STS (Rev. 4), however, allows six' hours to reach Mode 3 with the provision that actions be initiated to place the unit in Mode 3 within one hour. Since the six hour time period allows a more orderly shutdown, the potential for challenge to Davis-Besse's safety systems, based on engineering judgement, is lowered, thereby increasing the margin '

of safety.

The safety function of Section 4.0.3 is to. provide guidance _in the determination of equipment / system operability in the event of missed surveillance tests. This amendment adds up to a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period to allow the missed test to be performed before entry into'the shutdown statement

!. is required. This period will help avoid ~an unnecessary transient on the plant, and a potential challenge to safety systems.- As an example, current Technical Speecifications allow one emergency diesel generator to be out of service (proven inoperable) for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, so it can be justified that a similar extension for a potentially inoperable system

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should be given to avoid unnecessary plant transients like a shutdown that may challenge the system that is.in question. Based on engineering judgement, the relative risk due to potential inoperability of a missed surveillance test is lower than the risk due to a plant shutdown created-transient before a surveillance can be performed to confirm the actual '

condition of the equipment. Therefore, based on engineering judgement, the margin of safety of Davis-Besse will not be decreased by this amendment.

This amendment request does not involve an unreviewed safety question.

lab b/10

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