ML20207Q409
| ML20207Q409 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/15/1987 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20207Q404 | List: |
| References | |
| NUDOCS 8701270288 | |
| Download: ML20207Q409 (1) | |
Text
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3/4.8 ELECTRICAL POWER SYSTEMS li BASES 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 system 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 are consistent with the initial condition assumptions of the safety 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 and single failure of the other onsite A.C. source.
For the purposes of the diesel generator start testing, " ambient condition" mear.s the diesel engine coolant and oil are being continuously circulated and maintained at a temperature consistent with the manufacturer's recommendations.
All preplanned diesel generator starts, including action statement required starts, may be preceeded by prelube and or other warmup procedures recommended by the manufacturer.
Additionally, except for the 18-month simulated loss of offsite power diesel test, all preplanned diesel generator runs, including action statement required runs, may be gradually loaded, reloaded and unloaded as recommended by the manufacturer.
The purpose of following these manufacturer's recommendations is to minimize the mechanical and thermal stress and wear on the diesel engine.
Diesel generator operability is normally demonstrated by carrying load.
Because the diesel generator can be affected by offsite disturbances when it is synchronized with the grid, the diesel loadin limited or eliminated during inclement weather (i.e., lightning, etc.)g may be or any other. time loading would present a safety concern.
In cases as outlined above, diesel operability is not contingent upon loading.
The OPERABILITY of the minimum specified A.C.
and D.C.
power sources and i
associated distribution systems during shutdown and refueling ensures that 1) l the facility can be maintained in the shutdown and refueling condition for extended time periods and 2) sufficient instrumentation and control capability l
is available for monitoring and maintaining the facility status.
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