ML20128B088

Proposed TS 3/4.7.1.6 Re Main Feedwater Isolation Sys

ML20128B088
Person / Time
Site:	Vogtle
Issue date:	01/22/1993
From:	GEORGIA POWER CO.
To:
Shared Package
ML20128B085	List: ELV-05103, Suppls 920731 Application for Amend to Licenses NPF-68 & NPF-81,adding New TS for Feedwater Isolation Sys.Suppl Submitted for Consistency W/Rev 0 to NUREG-1431 Re STS for Westinghouse Plants,Issued by NRC on 920928 ML20128B088
References
NUDOCS 9302020396
Download: ML20128B088 (3)

Text

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4 PLANT SYSTEliS BASES 3/4.7.1.6 Main Feedwater Isolation Systems Isolation of the main feedwater (AFW) system is provided when required to mitigate the consequences of a steam line break, feedwater line break, feedwater controller malfunction, steam generator tube rupture or small break loss of coolant accident.

Redundant isolation capability is provided by two isolation systems on each steam line consisting of the main feedwater isolation valve (MFIV) and its associated bypass valve (BFIV) and the main feedwater regulating valve (MFRV) and its associated bypass valve (BPRV). The safety function of these valves is fulfilled when closed. Therefore, a foodwater isolation system may be considered OPERABLE if its respective valves are OPERABLE or if they are maintained in a closed and deactivated position. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> completion time to either restore or close an inoperable valve takes into account the redundancy afforded by the remaining OPERA 0LE valves and the low probability of an event occurring that would 19 quire isolation of the MFW flow paths during this time period. The 7 day completion time to verify that an inoperable valve is clored or isolated is reasonable based on valve status indications available in the control room, and other administrative controls to ensure the valves are closed or isolated.

VOGTLE UNITS-1 & 2 B 3/4 7-2a 9302020396 930122 PDR ADOCK 05000424 P PDR

ENCLOSURE 3 VOGTLE ELECTRIC GENERATING PLANT REQUEST TO REVISE TECHNICAL SPECIFICATIONS ADDITION OF FEEDWATER ISOLATION SYSTEMS INSTRUCTIONS FOR INCORPORATION The proposed change to the Vogtle Electric Generating Plant Technical Specifications would be incorporated as follows.

Remove Pace Insert Pace W 3/4 7-9* and 3/4 7-10* 3/4 7-9* and 3/4 7-9a 3/4 7-10*

B 3/4 7-2a

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PLANT SYSTEMH MAIN FEEDWATER ISQLATION SYSTEMS IJ11ITING CONDITION FOR OPERATION 3.7.1.6 Fodr main foodwater isolation valves (MFIVs), four main feedwater regulating valves (MFRVs), and associated bypass valves shall be OPERABLE.

APPLICABILITY:* MODES 1 AND 2, except when the MFIV, MFRV or associated bypass valve is closed and deactivated.

ACTION:

a. With one MFIV, MFRV, or associated bypass valve inoperable in one or more feedwater lines, operation may continue provided each inoperable valve is restored to OPERABLE status or closed in each feedwater line within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Otherwise 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 />,

b. With no isolation system (each system consisting of a MFIV and its associated bypass valve or a MFRV and its associated bypaas valve) OPERABLE ** in any one feedwater line, restore at least one isolation system in each feedwater line to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in HOT SHUTDOWN within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

SURVEILLANCE REOUIREMENTS 4.7.1.6(a) Each MFIV, BFIV, MFRV and BFRV shall be demonstrated OPERABLE by verifying full closure within 5 seconds when tested pursuant to Specification 4.0.5. The provisions of 4.0.4 are not applicabic for entry into MODE 2.

4.7.1.6(b) For each inoperable valve, verify that it is closed or isolated once per 7 days.

• Each MFIV, MFRV, or associated bypass valve shall be treated independently.

• • An OPERABLE main feedwater isolation system may consist of inoperable valves provided the inoperable valves are maintained closed and deactivated.

VOGTLE UNITS-1 &2 3/4 7-9a

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