ML20116K349

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Proposed Tech Specs Re Battery Load Profiles
ML20116K349
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 08/09/1996
From:
PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML20116K299 List:
References
NUDOCS 9608150023
Download: ML20116K349 (5)
v • d • e


Text

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DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.6 Verify each required battery charger 24 months supplies its associated batteries at the voltage and current adequate to demonstrate battery charger capability requirements are met.

SR 3.8.4.7 -------------------NOTE-------------------

The modified performance discharge test in SR 3.8.4.8 may be performed.in lieu of the service test in SR 3.8.4.7 once per 60 months.

Verify battery capacity is adequate to 24 months supply, and maintain in OPERABLE status.

the required emergency loads for the design duty cycle when subjected to a battery i

service test.

l (continued) l r

1 SUS 00EHANNA - UNIT.1 3.8-27 Amendment 0A. 07/31/96 l 9608150023 960809 PDR ADOCK 05000387

P PDR

, e DC Sources-Operating 3.8.4 SURVEILLANCE REOUIREMENTS (continued)

,, SURVEILLANCE FREQUENCY  ;

I SR 3.8.4.8 verify battery capacity is = 80% of the 60 months manufacturer's rating when subjected to a performance discharge test or a modified M performance discharge test, -!

f' 12 months when battery shows i degradation or 1 has reached 85%

of expected 4

service life with capacity

< 100% of manufacturer's rating i M  :

24 months when battery has reached 85% of the expected service life with capacity

= 100% of manufacturer's rating I

l SUSOUEHANNA - UNIT 1 3.8-28 Amendment 0A. 07/31/96 i

DC Sources-Operating B 3.8.4

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BASES SURVEILLANCE SR 3.8.4.6 REQUIREMENTS (continued) Battery charger capability requirements are based on the design capacity of the chargers (Ref. 3). According to Regulatory Guide 1.32 (Ref. 9), the battery charger supply is required to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state irrespective of the status of the  !

unit during these demand occurrences. The minimum required '

amperes and duration ensures that these requirements can be l satisfied. Adequate performance is demonstrated by ensuring the battery charger supplies its associated batteries at the 3 following rates for 2 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />s:

a) 2 100 amps for the 125 V battery at 2 127.8 V: l i

b) 2 300 amps for the 250 V battery at 2 255.6 V: 1 and, c) t 200 amps for the 125 V Diesel Generator E battery at 2 127.8 V The Frecuency is acce) table, given the unit conditions requirec to perform t1e test and the other administrative controls existing to ensure adequate charger performance i during these 24 month intervals. In addition. this  !

Frequency is intended to be consistent with expected fuel cycle lengths.

SR 3.8.4.7 A battery service test is a special test of the battery's capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The test can be conducted using actual or simulated loads. The discharge rate and test length corresponds to the design duty cycle requirements as specified in Reference 4.

1 The Frequency of 24 months is consistent with the recommendations of Regulatory Guide 1.32 (Ref. 9) and Regulatory Guide 1.129 (Ref. 10), which state that the l battery service test should be performed during refueling

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l (continued)

SUSQUEHANNA - UNIT 1 B 3.8-57 Amendment 0A, 07/31/96 J

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.7 (continued)

REQUIREMENTS operations or at some other outage, with intervals between l l tests not to exceed 24 months.

This SR is modified by a Note which allows the performance l of a modified performance discharge test in lieu of a service test once per 60 months.  !

The modified performance discharge test is a simulated duty  !

cycle consisting of just two rates: the one minute rate- I published for the battery'or the largest current load of the l duty cycle, followed by the test rate employed for the  ;

performance test. both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a rated one minute discharge represents a very small portion of the battery capacity. the test rate can be changed to that for the ~ performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test should remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test.

A modified discharge test is a test of the battery capacity '

and its ability to provide a high rate short duration load ,

(usually the highest rate of the duty cycle). This will  ;

often confirm the battery's ability to meet the critical period of the load duty cycle. in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test.

SR 3.8.4.8 A battery performance discharge test is a test of constant current capacity of a battery, normally done in the as found  ;

condition, after having been in service, to detect any <

change in the capacity determined by the acceptance test.  ;

The test is intended to determine overall battery i degradation due to age and usage.

A battery modified performance discharge test is described

- in the Bases for SR 3.8.4.7. Either the battery performance (continued)

SUS 00EHANNA - UNIT 1 B 3.8-58 Amendment 0A. 07/31/96 i

1 DC Sources-Operating l B 3.8.4 j i '

BASES SURVEILLANCE SR 3.8.4.8 (continued)

REQUIREMENTS discharge test or the modified performance discharge test is j

acceptable for satisfying SR 3.8.4.8: however, only the modified performance discharge test may be used to satisfy SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 at the same time.

The acceptance criteria for this Surveillance is consistent with IEEE-450 (Ref. 8) and IEEE-485 (Ref. 11). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing. even if there is ample capacity to meet the l load requirements.

The Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85%

! of its expected service life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced

to 12 months. However, if the battery shows no degradation i

but has reached 85% of its expected service life the l Surveillance Frequency is only reduced to 24 months for batteries that retain capacity = 100% of the manufacturer's rating. Degradation is indicated, according to IEEE-450 (Ref. 8), when the battery ca3acity drops by more than 10%

relative to its capacity on tie previous performance test or l when it is 10% below the manufacturer's rating. All these Frequencies are consistent with the recommendations in IEEE-450 (Ref. 8).

REFERENCES 1. 10 CFR 50. Appendix A. GDC 17.

2. Regulatory Guide 1.6.
3. IEEE Standard 308.
4. FSAR Chapter 6.
5. FSAR, Chapter 15.
6. Final Policy Statement on Technical Specifications

, Improvements. July 22. 1993 (58 FR 39132).

l

(continued)

SUSOUEHANNA - UNIT 1 B 3.8-59 Amendment 0A. 07/31/96

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