ML17289A734
| ML17289A734 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/16/1992 |
| From: | WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | |
| Shared Package | |
| ML17289A733 | List: |
| References | |
| NUDOCS 9207200148 | |
| Download: ML17289A734 (3) | |
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ELECTRICAL POWER SYSTEMS BASES A.C.
SOURCES D.C.
SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS (Continued)
The diesel generator fast start surveillance requirements, based on a
- study, are sufficient to demonstrate the onsite A.C. power system capability to mitigate the consequences of the design basis event for the plant, i.e.,
large LOCA coincident with a loss-of-offsite power, while minimizing the mechanical stress and wear on the diesel engine.
The surveillance requirements for demonstrating the OPERABILITY of the unit batteries are in accordance with the recommendations of Regulatory Guide
- 1. 129, "Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants,"
February
- 1978, and IEEE Std 450-1980, "IEEE Recom-mended Practice for Maintenance,
- Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations."
Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.
Table 4.8.2. 1-1 specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage and specific gravity.
The limits for the designated pilot cells float voltage and specific gravity, greater than
- 2. 13 volts and 0.015 below the manufacturer's full charge specific gravity or a battery charger current that had stabilized at a low
- value, is characteristic of a charged cell with adequate capacity'.
The normal limits for each connected cell for float voltage and specific gravity, greater than
- 2. 13 volts and not more than 0.020 below the manufacturer's full charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturer's full, charge specific gravity, ensures the OPERABILITY and capability of the battery.
Operation with a battery cell's parameter outside the normal limit but within the allowable value specified in Table 4.8.2. 1-1 is permitted for up to 7 days.
During this 7-day period:
(1) the allowable values for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the allowable value for the average specific gravity of all the cells, not more than 0.020 below the manufacturer's recommended full charge specific gravity ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity, ensures that an individual cell's specific gravity will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained within an acceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function.
WASHINGTON NUCLEAR - UNIT 2 8 3/4 8-2 9207200i48 9207ib PDR ADOCK 05000397 P',.,,
Proposed insert:
Bases section 3 4.8. 1 3 4.8.2 and 3 4.8.3 A.C.
SOURCES D.C.
SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS The simulated emergency load profile used for the battery service test of Surveillance Requirement 4.8.2. l.d is verified to be at least equivalent to the actual emergency load profile and is based on anticipated operations required during loss-of-offsite power (LOOP) and loss-of coolant accident (LOCA) conditions as described in the WNP-2 Final Safety Analysis Report (FSAR).
The simulated emergency load profiles for the batteries are defined and located in the FSAR Section 8,3.
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