ML20055H921

Proposed Tech Specs Adding New Surveillance Requirements for Station & Diesel Batteries

ML20055H921
Person / Time
Site:	Oyster Creek
Issue date:	07/24/1990
From:	GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20055H901	List: ML20055H900 ML20055H921
References
NUDOCS 9007310137
Download: ML20055H921 (3)

Text

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. Th3 cpecific' gecvity, ' fer c ch coll, 10 ' gr:ct:r th:n '

.or equal;to 1.'190 whenLeorrectedito 77'F. .The  : 1

,, - electrolyte temperature of.every fifth cell:

(Diesel; every fourth cell) sha.11 be recorded'for-j j

surveillance review. .

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1 , 3. At least.once per 12 months, the diesel generator l, 1 battery capacity shall be. demonstrated to be ableitoi il supply the design duty. loads'(diesel start) during a ,J

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battery service test. y J

[ ', 4. At least once per 24 months (during shutdown, the- '! d W ifo11owing tests will be' performed to verify battery e(

,Lm, capacity. '

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[< , a.. Battery capacity.shall-.be demonstrated.to Li n , be at least'80% of the manufacturers' <

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[ o rating when subjected to a battery-capacity, discharge = test to be considered:

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b. Any battery which is demonstrated to have '

less than 85% of manufacturers ratingsL <

during a capacity discharge test _shallbe,  ;

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replaced during the subsequent refueling-

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's ; . Station battery capacity shall be, 5 '

mt demonstrated to be able to supply the m design duty. cycle' loads-during a battery ,7 service test. <,

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d. Battery low = voltage annunciatorsfare j

% verifled.to pick-up at--115 volts-1:1. volt? L!

, and:to reset at 125 volts't 1: volt- d

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, Basis: The' biweekly tests of the diesel-generators are primarily~to check >

E ' for failures and deterioration:in the system since'last use. .The  ;

- manufacturer has recommended the-two week test interval, based on- i 4

experience with many of their engines. One factor in. determining 1 this test interval (besides checking whether or.not the engine l-

, starts and runs).is that the lubricating oil should be circulated = I through the engine approximately'every two weeks. The diesels ,j (D m . should be loaded to at least-20% of rated power until engine and l

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~ generator temperatures have stabilized (about one. hour). The 1 W s minimum 20%' load will prevent soot formation its the cylinders and 6h 4 injection nozzles. Operation up.to-an equilibrium' temperature

- ensures that there is no over-heat problem., The tests also provide an engine and generator operating history to be compared with' 1

subsequent engine-generator test data to identify and correct any

g. mechanical or electrical deficiency before it can result in a system failure. j OYSTER CREEK 4.7-2 Amendment No.: 15,55,60 i

i o007310137 900724 PDR ADOCK0500g At d P i

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iil f i > Theltest during refueling outages is more comprehensive,. . I '

L ~ including procedures thatiare most offactively conducted at that-

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! time.-~These-include' automatic actuation and functional capability' tests,4to verify that the_ generators can start'and'

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assume 1oad in-less.than 20 seconds and testing of~the diesel .i generator load sequence timers which provide protection from'a  !

possible diesel generator' overload during LOCA conditions.- >

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Thorough-inspections will detect any signs of. wear long before failure. .

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h,' LThe manufacturer's instructions for_ battery care and, maintenance: j I

, with regard to the floating charge, the= equalizing ~ charge,-_and y U -the addition of water will be'followed. In addition, written- 4

~ records will belmaintained-of the battery performance. . station / ,

batteries w'.11 deteriorate with time, but precipitous. failure is= j Q unlikely. The: attation'aurveillance procedures' follow'the  ;!

recommei*ed' maintenance and-testing practices of IEEE STD. 450. "

which have demonstrated, through experience, . tho' ability to ,

provide positive indications of cell deterioration tendencies long before such tendencies cause cell irregularity or improper- 9 1 cell performance.' >

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The battery service test is a special capacity test to

, demonstrate th's capability'of the battery to meet the system design. requirements. The Oyster Creek design duty cycle loads lare determined by a LOC 7 subsequent to a loss of AC power. ' Thel <

1 battery performance test is a, capacity test on the. battery to [

' check it:against the manufacturer's specified capacity and.is

,- used to determine when the battery has arrived at.the end of its'

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% 9 .IEEE Standard 450-1975: recommends battery-performance testing once.per fiveLyears. IEEE Standard :308-1974 recommendu. battery g '

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N ,. Performance testing'once per three_ years.=lThe_ Oyster-Creek E- , Technical 1 Specifications-re_ quire a periortance test ence per two 0 years. Both IEEE. Standards recommend decrsasing.the, L>

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' surveillance interval to annually when battery service life. ;p exceeds 854.

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., The diesel generator batteries are challenged every two weeks to Li J ,

perform the 20% load test. This effectively performs.an ,

.uninstrumented battery service test.- The: biweekly! diesel start,

when combined with the1 annual _ battery service test, provides'an- -l extensive amount of data on battery performance-characteristics. This test-data negates the nased'to-lower the ,

,' e battery performance test interval from biennially to annually. /

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The station batteries are required for plant operation, and

-performing the station battery performance test requires the

,[ reactor to be in COLD SHUTDOWN. The guidance in IEEE 450-1975 would-result in 3 performance tests to reach 85% service life, jl, ,

OYSTER CREEK 4.7.3 AMENDMENT NO.'s '

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followed by 3 performanes tecto'to comploto bottory lifo..< The

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guidance in IEEE'308-1974 would. result in 5 performance tests to reach ? 85%

service-11fe;1followed by 3 performance tests, toc

' complete battery life. The Oyster Creek Technical ~

specifications l require 8 performance tests to reach 854 service

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L iil + 11fe, followed by 2 performance tests ta) complete battery-life.

'[f -The requirement which would resultLin a reactor shutdown for the

j. ' solo purpose of' performing a battery performance testiduring the last 15% of-battery life cannot be' justified to11ncrease battery-.

f' is, " , test performance.from 2 to 3 in'a 3- Additionally, Jt1 the increase'in battery performance' testing year period. during the first 85%

of battery service life would result in a, greater: level of ffJ g battery, reliability by identifying, and causing to be corrected,

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small anomalies in cell performance thereby reducing battery- _

= failure probability.

< e ,y The requirement to' replace any battery'in the next refueling:

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outage which: demonstrates less than 85% of manufacturers-

. capacity during-a capacity discharge test provides additional

-assurance of continued battery operability.

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1 OYSTER CREEK- 4.7-4 AMENDMENT NO.:

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