ML20101Q087
| ML20101Q087 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/08/1996 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML20101Q085 | List: |
| References | |
| NUDOCS 9604100173 | |
| Download: ML20101Q087 (3) | |
Text
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I 3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.1 and 3/4.8.2 A.C. and D.C. POWER SOURCES AND DISTRIBUTION 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 Criteria 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 are consistent with the initial condition assumptions of the accident analyses anu are based upon maintaining at least one of each of the 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 otiier onsite A.C. source.
The fourteen day outage permitted once each 18 months per EDG for performance of a preventive maintenance inspection during power operation has been shown to have no significant impact on core damage frequency, providing the Alternate A.C. Diesel Generator (AAC DG) is OPERABLE as defined in administratively controlled station documents. Removal of other components from service during this time shall be governed by administrative procedure.
If the AAC DG is inoperable during the fourteen day period of EDG inspection, the OPERABILITY of the remaining EDG need not be demonstrated since the AAC DG was designed and purchased according to specifications which adequately insure that common cause failure is not likely.
When one EDG is inoperable due to the fourteen day preventive maintenance inspection the three other EDGs and the AAC DG are required to be OPERABLE. The AAC DG is ensured OPERABLE by action statement b for Technical Specification 3.8.1.1. The other EDG on the same unit is ensured OPERABLE by action statement b for Technical Specification 3.8.1.1. The opposite unit's EDGs are ensured OPERABLE by action statement b for Technical Specification 3.8.1.1 of that unit.
The ACTION requirements specified in Modes 5 and 6 address the condition where sufficient power is unavailable to recover from postulated events (i.e., fuel handling accident).
Implementation of the ACTION requirements shall not preclude completion of actions to establish a r,afe conservative plant condition. Completion of the requirements will prevent the occurrence of postulated events for which mitigating actions would be required.
9604100173 960400 PDR ADOCK 0500033G P
PDff NORTil ANNA - UNIT 1 B 3/4 8-1 Amendment No. 33r47 4%,
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3/4.8 ELECTRICAL POWER SYSTEMS BASES 3/4.8.1 and 3/4.8.2 A.C. and D.C. POWER SOURCES AND DISTRIBUTION 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 Criteria 17 of Appendix "A" to 10 CFR 30.
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 are consistent with the initial condition assumptions of the accident analyses and are based upon maintaining at least one of each of the onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power e.nd single failure of the other onsite A.C. source.
The ACTION requirements specified in Modes 5 and 6 address the condition where sufficient power is unavailable to recover from postulated events (i.e., fuel handling accident).
Implementation of the ACTION requirements shall not preclude completion of actions to establish a safe conservative plant condition. Completion of the requirements will prevent the occurrence of postulated events for which mitigating actions would be required.
The fourteen day outage permitted once each 18 months per EDG for performance of a preventive maintenance inspection during power operation has been shown to have no significant impact on core damage frequency, providing the Alternate A.C. Diesel Generator (AAC DG) is OPERABLE as defined in administratively controlled station documents. Removal of other l
components from service during this time shall be governed by administrative procedure.
l If the AAC DG is inoperable during the fourteen day period of EDG inspection, the OPERABILITY of the remaining EDG need not be demonstrated since the AAC DG was designed and purchased according to specifications v/hich adequately insure that common cause failure is not likely.
When one EDG is inoperable due to the fourteen day preventive maintenano inspection the three other EDGs and the AAC DG are required to be OPERABLE. The AAC DG is ensured OPERABLE by action statement b for Technical Specification 3.8.1.1. The other EDG on the same unit is ensured OPERABLE by action sta'ement b for Technical Specification 3.8.1.1. The opposite unit's EDGs are ensured OPERABLE by action statement b for Technical Specification 3.8.1.1 of that unit.
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 NORTli ANNA - UNIT 2 B 3/4 8 1 Amendment No. 44.44rD8,
1.0 DEFINITIONS (Continued)
ENGINEERED SAFETY FEATURE RESPONSE TIME 1.12 The ENGINEERED SAFETY FEATURE RESPONSE TIME shall be that time interval from when the monitored parameter exceeds its ESF actuation setpoint at the channel sensor until the ESF equipment is capable of performing its safety function (i.e., the valves travel to their required positions, pump discharge pressures reach their required values, etc.). Times shall include emergency diesel generator starting and sequence loading delays where applicable.
l FREOUENCY NOTATION 1.13 The FREQUENCY NOTATION specified for the performance of Surveillance Requirements shall correspond to the intervals defined in Table 1.2.
FULLY WITHDRAWN 1.13a The control bank FULLY WITHDRAWN position shall be within the interval of 225 to 229 steps withdrawn, inclusive. Definition of the FULLY WITHDRAWN position for each specific cycle shall be documented in the rod insertion limit operator curve.
GASEOUS RADWASTE TREATMENT SYSTEM 1.14 A GASEOUS RADWASTE TREATMENT SYSTEM is the system designed and installed to reduce radioactive gaseous effluents by collecting primary coolant system offgases from the primary system and providing for delay or holdup for the purpose of reducing the total radioactivity prior to release to the environment. The system is composed of the waste gas decay tanks, regenerative heat exchanger, waste gas charcoal filters, process vent blowers, waste gas surge tanks and waste gas diaphragm compressor.
IDENTIFIED LEAKAGE 1.15 IDENTIFIED LEAKAGE shall be:
Leakage (except CONTROLLED LEAKAGE) into closed systems, such as pump a.
seal or valve packing leaks that are captured and conducted to a sump or collecting tank, or b.
Leakage into the containment atmosphere from sources that are both specifically located and known either not to interfere with the operation of leakage detection systems or not to be PRESSURE BOUNDARY LEAKAGE, or Reactor coolant system leakage through a steam generator to the secondary system.
c.
MEMBER (S) OF THE PUBLIC
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l.16 MEMBER (S) OF THE PUBLIC shall include all individuals who by virtue of their occupational status have no formal association with the plant. This category shall include non-employees of the licensee who are permitted to use portions of the site for recreational, occupational, or other purposes not associated with plant functions. This category shall D_olinclude non-employees such as vending machine servicemen or postmen who, as part of their formaljob function, occasionally enter an area that is controlled by the licensee for purposes of protection of individuals from exposure to radiation and radioactive materials.
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NORTil ANNA - UNIT I l-3 Amendment No.16A4rl46rl49,
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