ML20217H607

Proposed Tech Specs Pages,Revising Bases for Proposed Improved TS SR 3.8.6.1 & 3.8.6.3,to Indicate That Correction for Level Is Not Required When Battery Charging Current Is Less than 2 Amps for Gould & Less than 3 Amps for C&D

ML20217H607
Person / Time
Site:	Byron
Issue date:	08/07/1997
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20217H597	List: ML20217H595 ML20217H607
References
NUDOCS 9708130111
Download: ML20217H607 (8)

Text

ATTACllMENT 2 PROPOSED CHANGES TO APPENDIX A, TECllNICAL SPECIFICATIONS, FOR FACILITY OPERATING LICENSES NPF-37 AND NPF-66 Electrical Power Systems, D. C. Sources Revised Page:

3/4 8-11a This page supersedes the corresponding page from the original submittal (Letter BYRON 97-0079, dated 4-7-97).

1 9700130111 970807 PDR ADOCK 0 4y4 P -

, _e - -

I

I .

ELFCTRICAL POWER SYSTEsts SURVEILLANCE REDUIREstENTS fcontinued) e.

Atleastonceper80 battery capacity is months at leas {duringshutdown

msub.iected iaT b verifying that the manufacturer's rating when a to) 805 gt_y;4 of thit or a modified performance discharge test. perforsknce The modifieddischarge performancetest (C4D)i

^

rformance discharge test Gould) may

' discharge se n..., _ in testAAT&T) lieu of the ba and Specifict.tior, 4.8.2.1.2d. ;

the Nory service test required (by

f. AtleastonceperNbthsduringshutdown by givi performance discharge tests or modified performance discharge tens of battery tapacity to any battery that shows signs of degradation or has reached 85% of the service life expected for the application, redation 105 is indicated when the battery capacity drops more than SE-previous ger(?::10) of rated capacity from its capacity on theformance test

.::: pit.) 905 (t::

M) of the manufacturer's rating. ,

ly}luffro b bil%* pop .

l t

9 9

BYRON - UNITS 1 & 2 3/4 6-11a AMENDNENT NO.

lasert for page 3/ 811a This requirement is applicable to Batteries 112, 211, and 212. This requirement is applicable to, Battery 111 upon entering MODE 4 for Unit 1, Cycle 9.

g. At least once per 18 months during shutdown, by giving performance discharge tests or modified performance discharge tests of battery capacity to any battery that shows signs of degradation or has reached 85% of the service life expected for the application.

Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its capacity on the previous performance l test or modified performance test, or is below 90% of the manufacturer's rating. This requirement is applicable to Battery 111 until entering MODE 4 for Unit 1, Cycle 9.

If the battery has reached 95% of service life, delivers a capacity of 100% or greater of the manufacturer's rated capacity, and has shown no signs of degradation, performance testing at two-year intervals is acceptable until the battery shows signs of degradation.

~

ATTACHMENT 3 PROPOSED CHANGES TO PROPOSED IMPROVED TECHNICAL SPECIFICATIONS Electrichi Power Systems, D. C. Sources Revised Pages:

3.8-22 B 3.8-57 B 3.8-70 B 3.8-72 i

These pages supersede the conesponding pages from the original submittal' (Letter BYRON 97-0079, dated 4-7-97).

. Note - the original insert for page B 3.8-57 has been incorporated into the replacement -

page in this package, r'

(-:

DC Sources-Operating 3.8.4 SURVEILLANCE REOUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.4 -------------------NOTE-------------------

This Surveillance shall not be performed in MODE 1, 2, 3, or 4.

Verify battery capacity is a 80% of the 60 months manufacturer's rating when subjected to a performance discharge test (Gould).:or a AND modified performance.. discharge-test:-(C&D'i; 12 -18 months when battery shows degradation or has reached 85%

of expected life with capacity--

.< 100% of manufacturer'sl rating)

MD 24' months when battery has reached 85%:of the expected life with capacity?

a 100%.of~

manufacturer's rating BYRON - UNITS 1 & 2 3.8-22 Revision /I J

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.4 REQUIREMENTS (continued) A battery performance discharge test is a test of constant current capacity of a battery 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 degradation due to age and usage.

A'batteriimodified ~ performance' discharge ^ test is described in the; Bases / for SR 3.8;4.3; Either.the battery performance discharge test or the mot fied aerformance discharge test is acceptable -for satisfying 5R 3.3.4 4f however.ionly:the ~

modifiedi aerformance~ discharge test may be used to satisfy SR 3.8(4. 3_while satisfying the requirements off SR. 3.8.4.7 .

at the:same time; The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 9) and IEEE-485 (Ref. 5). 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 load requirements.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life tAe Frequcpcy is Surveillancethemanufact..reducedto18 is 5:;100%fof~ months.andicapscity urerfs! rating.::the' Surveillance

- Frequency is reduced 1to112 months:. c HoweverJifi the battery shows no degradation-but;hasireached 85%:off:itsLexpected~

life, the Surveillance l Frequency-is1onlydreduced to'24 months:for-batteries that retain: capacity a_100L of the manufacturer:scrating. ' Degradation is~1n~dicated, according to'IEEE2450'(Ref: 9), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test-or when it is a 10% below the manufacturer's rating. These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 9).

This SR is modified by a Note. The reason for the Note is that performing-the Surveillance would perturb the electrical distribution system and challenge safety systems.

(continued)

BYRON - UNITS 1 & 2 B 3.8-57 Revision [

Battery Parameters B 3.8.6 BASES SURVEILLANCE SR 3.8.6.1 (continued)

REQUIREMENTS The BIP limits specified for electrolyte level are based on manufacturer recommendations and are consistent with the guidance in IEEE-450 (Ref. 3), with an extra 1/4 inch allowance above the high water level indication for effects. margin operating to account for temperatures and charge In addition to this allo. lance, the electrolyte level is permitted to be above the specified maximum level during equalizing charge. 3rovided it is not overflowing.

These limits ensure that tie plates suffer no physical damage and that adequate electron transfer capability is maintained in the event of transient conditions. IEEE-450 (Ref 3) recommends that electrolyte level readings should be made only after the battery has been at float charge for at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

t The BIP limit specified for float voltage is = 2.13 V for i each individual cell. This value is based on a 1

recomendation of IEEE-450 (Ref. 3). which states that prolonged operation of cells < 2.13 V can reduce the life expectancy of the cell.

The BIP limit specified for specific gravity for each pilot cell is a 1.200 (0.015 nominal specific gravity).below the manufacturer fully charged This value is characteristic of a charged cell with adequate capacity. According to IEEE-450 (Ref. 3), the specific on a temperature of 77'F (25'C). gravity readings are based The specific gravity readings andlejve. are corrected for actual electrolyte temperature For each 3*F (1.67'C) above 77 F (25'C). 1 point (0.001)~is added to the reading: 1 point is subtracted for each 3*F below 77*F. The specific gravity of the electrolyte in a cell increases with a loss of water due to electrolysis or evaporation.

However correction for leve is not required when when on float charge. battery charging current is < 2 amp (Govkl) 3 (

r~

-h Oc e.ach God balltry. The specib 3ravihrenby for each C Ab Wiery att corruled for wch;al t.lec.%k femptralen., bol oof for len.1, uhich is in accordnace y & kke bakry mnofacture r's acomedab%

(continued)

BYRON - UNITS 1 & 2 B 3.8-70 Revision p

Battery Parameters B 3.8.6 BASES SURVEILLANCE SR 3.8.6.3 REQUIREMENTS (continued)

This SR verifies specific gravity for each pilot cell is within the limit specifie.1 in the BIP =

1.200 (0.015 below the manufacturer fully charged nominal specific gravity).

This value is characteristic of a charged cell with adequate capacity. According to IEEE-450 -(Ref. 3), the specific-Wxrt The specific gravity readings are corrected for actualg

^ggkA htn electrolyte temperature and levek For each 3*F (1.67'C) above 77"F (25"C), 1 point (0.001) is added to the reading:

1 point is subtracted for each 3*F below 77'F.

1 9.Ad # of water due to electrolysis or evaporation. gravity of th MM j4 However.

gl1111 S M N current is < 2 amps when on float charoncorrection for level is no This SR is modified (6eM)3 amp 8OAD)k o nute wniu oi wws either float current or specific gravity to be used to determine the state of charge of the battery. i the specific gravity SRs (SR 3.8.6.3, SR 3.8.6.7 andIf float current is SR 3.8.6.8) are not required to be met.

is used,tothe required float current requirement (SR 3.8.6.2) be met. is notIf specific grav Because of specific gravity that are produced during the recharging process. delays gradients of i

several days may gravity to stabilize.occur while waiting for the specific A stabilized charger current is an determining the state of charge. acceptable alternative to spec This phenomenon is discussed in IEEE-450 (Ref. 3).

SR 3.8.6.4 of representative cells is a 60*F. is consistent with recommendation temperature of of IEEE-450 electrolytes in (Ref. 3).cells representative thatshould states that the be determined on a quarterly basis.

battery capacity. Lower than normal temperatures act to inhibit or red This SR ensures that the operating temperatures remain within an acceptable operating range.

This limit is based on manufacturer recommendations.

(continued)

BYRON - UNITS 1 & 2 B 3.8-72 Res isjon A' i