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:

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

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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

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battery service test.

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At least once per 24 months (during shutdown, the-d W

ifo11owing tests will be' performed to verify battery e(

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Battery capacity.shall-.be demonstrated.to Li

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be at least'80% of the manufacturers'

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rating when subjected to a battery-1 capacity, discharge = test to be considered:

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f operable..

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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-i,,-

outage.,

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. Station battery capacity shall be, 5

mt demonstrated to be able to supply the design duty. cycle' loads-during a battery m

,7 service test.

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Battery low = voltage annunciatorsfare j

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

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

(Diesel; 112 volta i 1 volt)..

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&'i Basis:

The' biweekly tests of the diesel-generators are primarily~to check y"

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

- manufacturer has recommended the-two week test interval, based on-i experience with many of their engines. One factor in. determining 4

1 this test interval (besides checking whether or.not the engine l-I starts and runs).is that the lubricating oil should be circulated =

through the engine approximately'every two weeks. The diesels

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. 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

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minimum 20%' load will prevent soot formation its the cylinders and 6h injection nozzles. Operation up.to-an equilibrium' temperature 4

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

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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 ADOCK0500g PDR At d

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Theltest during refueling outages is more comprehensive,.

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~ 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' assume 1oad in-less.than 20 seconds and testing of~the diesel

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.i generator load sequence timers which provide protection from'a F(,

possible diesel generator' overload during LOCA conditions.-

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

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

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, with regard to the floating charge, the= equalizing ~ charge,-_and y

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-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=

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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 d

1 cell performance.'

s 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

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' check it:against the manufacturer's specified capacity and.is used to determine when the battery has arrived at.the end of its' I1ife.

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.IEEE Standard 450-1975: recommends battery-performance testing g

once.per fiveLyears.

IEEE Standard :308-1974 recommendu. battery 3

E-Performance testing'once per three_ years.=lThe_ Oyster-Creek "t

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, 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.

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exceeds 854.

i-t 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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LI The station batteries are required for plant operation, and

-performing the station battery performance test requires the

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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 1

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

guidance in IEEE'308-1974 would. result in 5 performance tests to

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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 L iil

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

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-The requirement which would resultLin a reactor shutdown for the j.

' solo purpose of' performing a battery performance testiduring the f'

last 15% of-battery life cannot be' justified to11ncrease battery-.

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Additionally, the increase'in battery performance' year period.

test performance.from 2 to 3 in'a 3-testing during the first 85%

Jt1 ffJ of battery service life would result in a, greater: level of g

battery, reliability by identifying, and causing to be corrected, small anomalies in cell performance thereby reducing battery-

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= failure probability.

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

outage which: demonstrates less than 85% of manufacturers-

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. 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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