ML19312E591

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Tech Spec 3.0.5 Re Operability of Equipment W/O Certain Electrical Power Sources & Tech Spec 3.8.2.2 Re Ac distribution-shutdown
ML19312E591
Person / Time
Site: Farley Southern Nuclear icon.png
Issue date: 05/30/1980
From:
ALABAMA POWER CO.
To:
Shared Package
ML19312E589 List:
References
NUDOCS 8006050353
Download: ML19312E591 (5)
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9 3/4 LIMITING CONDITIONS FOR OPERATION 3/4.0 APPLICABILITY LIMITING CONDITION FOR OPERATION 3.0.5 When a system, subsystem, component or device is determined to be inoperabic solely because its emergency power source or normal power source is inoperable, it may be considered OPERABLE for the purpose of satisfying the requirements of its applicable Limiting Condition for Operation provided:

(1) the system, subsystem, component or device and its redundant system (s), subsystem (s), component (s) or device (s) each have an OPERABLE normal or emergency power source.

(2) at least one train of the systems, subsystems, components or devices is made OPERABLE (or is inoperable solely because its normal power supply is inoperable) within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and is maintained in that condition, (3) if both a normal power source and an emergency power source are inoperable, at least one of the inoperable sources is restored to OPERABLE status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and y (4) at least one train of the systems, subsystems, components or devices is made OPERABLE within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, Otherwise declare the affected equipment inoperable and if the applicable Limiting Condition for Operation is not met comply with the applicable ACTION (s) or, in lieu of declaring the af fected equipment inoperable, be in at least I!OT 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 COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. This specification is not applicabic in MODES 5 or 6.

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. l 3/4.0 APPLICABILITY BASES 3.0.5 This specification delineates what additional conditions Ots he satisfied to permit operation to continue, consistent with the A::::N statements for power sources, when a normal or emergency power s:;rce is not OPERABLE. It specifically limits operation when one i .1: ion is inoperable because its normal or emergency power source is in:;erable and a redundant system, subsystem, component or device in 22::her train is inoperable for another reason.

The provisions of this specification permit the ACTION statements associated with individual systems, subsystems, trains, components, or devices to be consistent with the ACTION statements of the associated electrical power source. It allows operation to be governed by the time limits of the ACTION statement associated with the Limiting Condition for Operation for the normal or emergency power source, not the individual ACTION-statements for each system, subsystem, train, component or device that is determined to be inoperable solely because of the inoperability of its normal or emergency power source.

For example, Specification 3.8.1.1 requires in part that two emergency diesel generators be OPERABLE. The ACTION statement provides for a 72

OPERABLE, a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> out-of-service time when both an emergency diesel generator set and a normal power source are not OPERABLE, and a 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> out-of-service time when both diesel generator sets are not OPERABLE.

If the definition of OPERABLE were applied without consideration of Specification 3.0.5, all systems, subsystems, trains, components and devices supplied by the inoperable emergency power source would also be inoperable. This would dictate invoking the applicable ACTION statements for each of the applicable Limiting Conditions for Operation. However, the provisions of Specification 3.0.5 permit the time limits for continued operation to be consistent with the ACTION statement for the inoperable emergency diesel generator set instead, provided the other specified conditions are satisfied. In this case, this would mean that the corres-ponding normal power source must be OPERABLE, and all redundant systems, subsystems, components, and devices in the opposite train must have an OPERABLE emergency power source or an OPERABLE normal power source. One train of each system required by the current plant MODE must be made OPERABLE within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, or be capable of performing its design function and have an OPERABLE emergency power source within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. If both an emergency power source and a normal power source is inoperable (one on each train), one of the inoperable sources must be made OPERABLE within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. One train of each system required by the current plant MODE must be OPERABLE (with operable energency and normal power sources) within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. With both sets of emergency diesel generators not OPERABLE, if the definition of OPERABLE were applied without consideration of Specification 3.0.5, all systems, subsystems, trains, components, and devices supplied by the inoperable emergency power sources would also be inoperable. This would dictate invoking the applicable ACTION statements

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for each applicable Limiting Conditions for Operation and possibly Specification 3.0.3. However, if normal pcwer is available, the provisions of Specification 3.0.5 permit 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> to restore one _ set of emergency diesel generators, and at least one train of each system required by the

, current plant MODE to OPERABLE status. If these conditions cannot be net, either the affected equipment must be declared inoperable or shutdown is required in accordance with this specification.

..s a further example, Specification 3.8.1.1 requires in part that two p:7s:cally independent circuits between the offsite transmission network ani :he onsite Class IE distribution system be OPERABLE. The ACTION statement provides a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> out-of-service time when one required offsite circuit is not OPERABLE and a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> out-of-service time when b::h required offsite circuits are not OPERABLE. If the definition of OPERABLE were applied without consideration of Specification 3.0.5, all syste=s, subsystems, trains, components and devices supplied by the inoperable normal-power source (s) would also be inoperable. This would dictate invoking the applicable ACTION statements for each of the applicable LCOs. However, the provisions of Specification 3.0.5 permit the time limits for continued operation to be consistent with the ACTION statement for the inoperable normal power sources instead, provided-the other specified conditions are satisfied. In this case, this would mean that for the affected train the emergency power source must be OPERABLE and at least one train of each system required by the cu' rent r plant MODE must be made OPERABLE within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, or ,be capable of performing their design functions and have an OPERABLE emergency power source. One train of each system required by the current plant MODE must be OPERABLE (with emergency and normal power sources) within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. If both required offsite circuits are not OPERABLE, both emergency power sources must be

, OPERABL8 and the normal power source for one train and all redundant equipment in that train must be made OPERABLE within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. If these conditions are not satisfied, either the affected equipment must be declared inoperable or shutdown is required in accordance with this specification.

l y_ - In MODES 5 or 6 Specification 3.0.5 is not applicable, and thus the l individual ACTION statements for each applicable Limiting Condition for l Operation in these MODES must be adhered to. In any applicable MODE, I equipment that is not OPERABLE for any reason other than loss of normal j or emergency power must be considered inoperable regardless of the provisions of Specification 3.0.5 and the individual ACTION statements l for each applicable Limiting Condition for Operation must be adhered to.

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  • SAFETY EVALUATION FOR CHANGE TO THE A.C. DISTRIBUTION - SHUTDOWN TECHNICAL SPECIFICATION

Background:

The Electrical Power Systems technical specification for "A.C. Distribution

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Shutdown" which is applicable in Modes 5 and 6 requires that as a minimum five 600 volt load centers be operable. This number is in error and should be changed to four instead of five.

References:

(1) Technical Specification 3.8.2.2 Bases Technical Specification 3.8.2.2 requires that as a minimum one train of A.C.

electrical busses should be operable in Modes 5 and 6. ,There are four 600 volt load centers associated with each train of A.C. electrical power.

Therefore, the minimum number of 600 volt load centers listed in Paragraph

.3.8.2.2 should be four rather then five.

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Conclusion:

The proposed change to T'echnical Specification 3.8.2.2 does not involve an unreviewed safety question as defined by 10CFR50.59.

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ELECTRICAL POWER SYSTEMS A.C. DISTRIBUTION - SHUTDOWN LIMITING CONDITION FOR OPERATION

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3.8.2.2 As a minimum, the following train oriented A.C. electrical busses shall be OPERABLE and aligned to an OPERABLE diesel generator.

3 - 1460 Volt Emergency Bus "~~

  • 4 M 600 Volt Load Centers 2 - 120 Volt A.C. Vital Busses APPLICABILITY: MODES 5 and 6 ACTION:

With less than the above complement of A.C. busses. OPERABLE and energized, establish CONTAINMENT INTEGRITY within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

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SURVEILLANCE REQUIREFENTS -

4.8.2.2 The specified A.C. busses shall be determined OPERABLE and energized at least once per 7 days by verifying correct breaker alignment l and indicated power availability.

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