ML20213A186

Proposed Tech Specs Re Auxiliary Electrical Sys Surveillance Requirements

ML20213A186
Person / Time
Site:	Millstone
Issue date:	01/21/1987
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20213A172	List: B12394, Application to Amend License DPR-21,revising Tech Specs to Delete Ref to Switchyard Batteries.Fee Paid ML20213A186
References
NUDOCS 8702030151
Download: ML20213A186 (3)

Text

LD4ITING CONDITION FOR OPERATION 39 AUXILIARY ELECTRICAL SYSTEM Applicability:

Applies to the auxiliary electrical power system.

Objective:

To assure an adequate supply of electrical power during plant operation.

Specification:

A. The reactor shall not be made critical unless all of the following conditions are satisfied:

1. One 345 kv line, associated switchgear, and auxiliary startup transformer capable of automatically supplying auxiliary power.

2. Both emergency power sources are operable.

3 An additional source of power censisting of one of the following:

a. The 27 6 kV line, associated switch-gear, shutdown transformer to supply power to the emergency 4160 volt buses.

b. One 345 kv line fully operational and capable of carrying auxiliary power to the emergency buses.

4. 4160 volt buses five and six are energized and the associated 480 volt buses are energized.

5 All neutron monitoring 24 volt and station 125 volt batteries and associated battery chargers are operable.

SURVEILLANCE REQUIREMENT 4.9 AUXILIARY ELECTRICAL SYSTEM Applicability:

Applies to the periodic testing requirements of the auxiliary electrical system.

Objective:

Verify the operability of the auxiliary electrical system.

Millstone Unit 1 3/4 9-1 8702030151 870129 PDR ADOCK 05000245 p PDR

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SURVEILLANCE REQUIREMENT (Continued) 4.9 AUXILIARY ELECTRICAL SYSTEM 4.9.B.1.c The following tests will be performed in accordance with IEEE Standard 450-1975 "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations."

(1) At least once every refuel outage, a battery service test will be performed in accordance with section 5.6 of IEEE Standard 450-1975 to verify that the battery capacity is adequate to supply and maintain in operable status all of the actual emergency loads for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

(2) At least once every 60 months, during shutdown, a perfccmance discharge test will be performed in accordance with Section 5.4 of IEEE Standard 450-1975 to verify that the battery capacity is at least 80 percent of the manufacturer's rating. Once per 60-month interval, this performance discharge test may be performed in lieu of the battery service test.

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Millstone Unit 1 3/49-4 l

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4.9 AUXILIAEf ELECTRICAL SYSTEM BASES A. The monthly test of the diesel generator and gas turbine generator is conducted to check for equipment failures and deterioration. Testing is conducted up to equilibrium operating conditions to demonstrate proper operation at these conditions. Operation of the gas turbine generator for peaking purposes may substitute for the monthly performance check. The units will be manually started, synchronized to the bus, and load picked up. Generator experience at other generating stations indicates that the testing frequency is adequate to assure a high reliability of operation should the system be required. In addition, during the test when the generator is synchronized to the bus it is also synchronized to the off-site power source and thus not completely independent of this source. To maintain the maximum amount of independence, a thirty day testing interval is also desirable.

Both the diesel generator and the gas turbine-generator have air compressors and air receiver tanks for starting. It is expected that the air compressors will run only infrequently. During the monthly check of the units, the receivers will be drawn down below the point at which the compressor automatically starts to check operation and the ability of the compressors to recharge the receivers. Pressure indicators are provided on each of the receivers.

Following the tests or peaking operation, of the unit and at least weekly, the fuel volume remaining will be checked. At the end of the monthly load test of the diesel generator, the fuel oil transfer pump will be operated to refill the day tank and to check the operation of this pump. Peaking operation shall be controlled so that major maintenance operations on the gas turbine will not be scheduled during an operating cycle.

The test of the diesel and gas turbine generators during the refueling outage will be more comprehensive in that it will functionally test the system; i.e., it will check starting and closure of breakers and sequencing of loads. The units will be started by simulation of a loss of coolant accident. In addition, a loss of normal power condition will be imposed to stimulate a loss of off-site power. The timing sequence will be checked to assure proper loading in the time required. Periodic tests between refueling outages check the capability of the units to run at full load. Periodic testing of the various components plus a functional test at a refueling interval are sufficient to maintain adequate reliability.

B. Although the station batteries will gradually deteriorate with time, the surveillance specified is that which will provide an indication of all l

degradation long before the battery would have insufficient capacity te meet the design load which could be placed upon it. Battery cell replacements will be made in accordance with Section 6 of IEEE Standard 450-1972, " Battery Replacement Criteria."

C. Logging the diesel and gas turbine generator fuel supply weekly and after each operation, assures that the minimum fuel supply requirements will be maintained.

Millstone Unit 1 B 3/4 9-2