ML20137G522

Proposed Tech Specs Re Main Steam Line Atmospheric Relief Valves

ML20137G522
Person / Time
Site:	Callaway
Issue date:	01/14/1986
From:	UNION ELECTRIC CO.
To:
Shared Package
ML20137G514	List: ML20137G508 ML20137G522
References
ULNRC-1238, NUDOCS 8601210070
Download: ML20137G522 (3)

Text

Attachment 2 ULNRC-1238 Proposed Technical Specifications 3/4.7.1.6 B 3/4.7.1.6 8601210070 840114 PDR ADOCK Ot3000483 P PDR

PLANT SYSTEMS MAIN STEAM LINE ATMOSPHERIC RELIEF VALVES LIMITING CONDITION FOR OPERATION 3.7.1.6 At least three steam generator atmospheric relief valves (ARVs) shall be OPERABLE.

APPLICABILITY: Modes 1, 2, and 3.

ACTION:

a. With one of the required ARVs inoperable, within 30 days restore the ARV to OPERABLE status, or be in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />,

b. With more than one of the required ARVs inoperable, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> restore at least two of the required ARVs to OPERABLE status or be in HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

c. The provisions of Specification 3.0.4 are not applicable.

SURVEILLANCE REQUIREMENTS 4.7.1.6 No additional requirements other than those required by Specification 4.0.5

e O

PLANT SYSTEMS BASES 3/4.7.1.6 ATMOSPHERIC RELIEF VALVES The OPERABIILTY of the main steam line atmospheric relief valves (ARVs) ensures that reactor decay heat can be dissipated to the atmosphere in the event of a steam generator tube rupture and loss of offsite power and that the Reactor Coolant System can be cooled down for Residual Heat Removal System operation. Only one ARV is needed for the heat removal required. Three operable ARVs are adequate, assuming that one of the operable valves is on the faulted steam generator and that one ARV fails to function.

Each ARV is equipped with a manual block valve (in the auxiliary building) to provide a positive shutoff capability should an ARV develop leakage. An ARV is considered operable if the block valve is closed solely because of leakage. Closure of the block valves of all ARVs because of leakage does not endanger the reactor core; decay heat can be dissipated with the steam line safety valves or a block valve be opened manually in the auxiliary building and the ARV can be used to control release of steam to the atmosphere. Primary to secondary leakage can be terminated by depressurizing the Reactor Coolant System with the pressurizer power operated relief valves.

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