ML20071K618

Proposed Tech Specs Bases 3/4.8.1 & 3/4.8.2 Re Ac Sources & Onsite Power Distribution Sys

ML20071K618
Person / Time
Site:	Farley
Issue date:	07/28/1994
From:	SOUTHERN NUCLEAR OPERATING CO.
To:
Shared Package
ML20071K616	List: ML20071K614 ML20071K618
References
NUDOCS 9408010232
Download: ML20071K618 (2)

Text

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3 /4J FLECTRICAL POWER SYSTEldS BASES 3/4.8/1 AND 3/4.8.2 A.C. SOURCES AND ONSITE POWER DISTRIBUTION SYSTEMS The OPERABILITY of the A.C. and D.C. power sources and associated distribution systems during operation ensures that sufficient power will be available to supply the safety-related equipment required for 1) the safe shutdown of the facility and 2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix "A* to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources is consistent with the initial condition assumptions of the safety analyses and is based upon maintaining at least one redundant set of onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that 1) the facility can be maintained in the shutdown or r(fueling condition for extended time periods and 2) sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

The surveillance Requiremente for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guide 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971. The criteria of NUREG/CR 0660, " Enhancement of On Site Diesel Generator Reliability," February 1979, the manufacturer's recommendations, and cperating experience have been utilized to develop a diesel reliability program which provides an extremely high confidence in diesel operability. The surveillance test frequency is based on Regulatory Gu.ide 1.108, " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977, with adjustments made to preclude over testing which has been verified by the manufacturer to be detrimental to diesel generator reliability.

The Surveillance Requirements for demonstrating the OPERABILITY of the Station batteries are based on the recommendations of IEEE Standard 450-1980, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations.'

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FARLEY-UNIT 1 B 3/4 8-1 MARCH 22, 1994 9408010232 940728 PDR AD{N:iK 050CH)348 i P PLWt l

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x A e 3 M . 8 FLECTRICAL POWER SYSTEMS BASES 3/4.8.1 AND 3/4.8.2 A.C. SOURCES AND ONSITE POWER DISTRIBUTION SYSTEMS .

The OPERABILITY of the A.C. and D.C. power sources and associated distribution systems during operation ensures that sufficient power will be available to supply the safety-related equipment required for 1) the safe shutdown of the facility and 2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix "A" to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation l commensurate with the level of degradation. The OPERABILITY of the power sources is consistent with the initial condition assumptions of the safety analyses and is based upon maintaining at least one redundant set of onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source.

The OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systctns dulcing shutdown and refueling ensures that 1) the .

facility can be maintained in the shutdown or refueling condition for extended ) '

time periods and 2) sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Ragulatory Guides 1.9, "Se13ction of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, and 1.108, " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision l

1, August 1977.

The Surveillance Requirements for demsnstrating the OPERABILITY of the i Station batteries are based on the recommendations of IEEE Standard 450-1980, l

• IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large j Lead Storage Batt eries f or Generating Stations and Substations. " 1 l

3/4.8.3 ELECTRICAL EOUIPMENT PROTECTIVE DEVICES )

Containment electrical penetrations and penetration conductors are protected by either deenergizing circuits not required during reactor operation or by demonstrating the OPERABILITY of overcurrent protection I circuit breakers during periodic surveillance.

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i FARLEY-UNIT 2 B 3/4 8-1 MARCH 22, 1994 j i

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