ML20246K992

Proposed Tech Specs Documenting Improvements to Battery Surveillance Procedures

ML20246K992
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/14/1989
From:	PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20246K988	List: ML20246K984 ML20246K992
References
NUDOCS 8907180316
Download: ML20246K992 (12)

Text

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L Fort St. Vrain #1 )

L '. '. Technical Specifications i Amendment No.  !

Page 5.6-1  !

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5.6 EMERGENCY POWER SYSTEMS - SURVEILLANCE REP'.IREMENTS Applicability Applies to the surveillance of the equipment supplying i electrical power to the essential plant services.

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Objective l To establish the minimum frequency and type of surveillance for equipment supplying electric power to the plant auxiliaries to ensure that the motive power sources required to safely shut down the' plant j are available.

Specification SR 5.6,1 - Standby Diesel Generator Surveillance

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The surveillance of the 'stanoby diesel generators shall be as follows:

l a) Each standby diesel generator set will be. started and loaded to at least 50*; of rated full load capacity once per week. The test shall continue for at least two hours l to enable the standby diesel engine (s) and the generator to attain their normal operating temperatures, b) A loss of outside source of power and turbine trip shall l be simulated to demonstrate that the standby diesel generators and automatic controls are operable. This Surveillance Requirement shall be performed at least once per 6 months with a maximum allowable extension of 2 months per surveillance interval such that the maximum combined time interval for 3 consecutive surveillance intervals shall not exceed 20 months.

l c) The standby diesel engine protection functions shall be calibrated annually.

I d) The standby diesel engine exhaust temperature " shutdown" and "declutch" shall be functionally tested monthly and calibrated annually.

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Fort St.,Vrain:#1 C . . Technical 1 Specifications 1 e  : Amendment No'.

Page 5.6-2; n ,,

, e). 'A; loss of outside source of power-and turbine trip shall be'simulatedLat least once'per refueling ' cycle,; not. to exceed eighteen .(18)' months, 'toi demonstrate that the

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-standby diesel-generators, automatic controls and. load' i sequencers _are ' operable. This surveillance may be i performed'in lieu of SR 5.6.1.b above.

• Basis for Specification SR 5.6.1

The; purpose' of;the weekly test:of the standby diesel generator

n. 'is to exercise .the engine' by operating at design. temperature : and to.

ii. demonstrate' operating ; capability. -These'.' tests; will allow' < for: '

detection-of deterioration and failure of equipment.'

.The purpose of the loss of outside source of power and turbine trip' test (SR 5,6.1.b), performed twice^ annually is to verify that l the standby diesel: generator (s) are capable of starting automatically.

upon a simulated loss of outside' power and turbine trip. SR 5.6.1.e, performed 'at refueling -intervals, neifies the same features as SR 5.6.1.b' but, additionally, verifies' that .the. load sequencers automatically pick up required loads in the event of a loss of-voltage.on the-480V essential buses.

j' Specification SR 5.6.2 - Station Battery Surveillance l Each required DC electrical power source shall be demonstrated l OPERABLE:

1 'a. At least once per 7 days by verifying that:

The Category A limits in Table 5.6.2-1 are met,.and

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l 2. The total batt try terminal voltage is greater than or equal l- t'o 2.15' volts per cell on float charge.

l l b. At least once per- 92 days, and within 7 days after a battery' l discharge with battery terminal voltage below 110 volts, or l battery overcharge with battery terminal voltage above 145 volts, l by verifying that:

.] 1. The Category B limits in Table 5.6.2-1 are met, l 2. There is no visible corrosion at either terminals or l connectors, or the connection resistance of these items .s l- less than or equal to 150 micro-ohms, and l 3. The average electrolyte temperature of at least 20*s of the l cells for Station Bettery 1A and IB is above 70 degrees F l and for Station Battery IC is above 60 degrees F.

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, ,  : Fort St. ~ 1/roin #1 , . H

,/w, q TechnicaltSpecifIcations

, ' Amendment No.

1page 5.6-3.

l c. ~ AtLleastionce per 18 months by verifying thati

l' ;1.- . The; ' cells, cell plates, battery: racks, and cell-to-tell and'

_ terminal'. connections.show no visual' indication. of p1ysical

l-l' damage or abnormal deterioration,.

'The cell-to-cell and terminal connections are clean,' tight.,

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ll~ 'and. coated.with anti-corrosion material, and~

'l- 3. The resistanceLof each cell-to-cell and terminal connection

. l .: is less than or equal to-150 micro-ohms.

l 4.* The required battery chargers will supply atLleast:

l- a) 325 l(+0, -25) amperes for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for battery l l chargers IA or IB, ,

-l' b). 200-(+0,-25) amperes for at-least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for battery j l charger 10, '

I c) ~ 345 -(+0, -25) amperes for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for battery  !

I charger 10. '~ l c ,j l d. ;At least'once.per'18' months during REACTOR SHUTDOWN, by verifying i

.l that the-battery capacity is adequate to supply and maintain in .

l an OPERABLE status all of the emergency loads for the design duty  !

O cycle.when the battery is subjected to a. Service Discharge- Test.

l e. **At'least'once per 60.. months, during REACTOR SHUTDOWN, by:

q l~ 1. A Performance Discharge Test of Batteries LIA and .1B, l l separately, (based 'on an . average discharge ra te. ' of 1 l 340-amperes at an average- electrolyte temperature of 77 i l: degrees F) over a period of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, until the average l battery terminal voltage reaches 1.75 volts / cell; the test l shall be acceptable if, after 3.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> the battery . is j l capable- of producing at'least 340 amperes, and the average. .j

.l' battery terminal voltage is greater than 1.75 volts / cell.

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[i, l* The battery chargers shall be surveilled during REACTOR SHUTDOWN 1

l. in accordance with this provision at the first outage of one week. j l duration or more following the effective date of this amendment  ;

l or sooner.  ;

1 l ** A Performance Cischarge Test will be performed in place of a i

, , .) Service Discharge Test during mid-1990 or- scor. r in accordance 1 l: with IEEE guidance (i.e., within two years of installing a new ]

l- battery). i

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Fort St. Vrain #1 l.- .'. Technical Specifications

, Amendment No.

Page 5.6-4 l' 2. A Performance Discharge rest on battery IC (based on an l . average discharge rate 01 '183 amperes at an average i electrolyte temperature of 77 degrees F) over a period of 4 l hours, until the average battery terminal voltage reaches 1 1.81 volts / cell; the test shall be acceptable if, after 3.2 l hours the battery is capable of producing at least 183 l amperes and the average. battery terminal voltage is greater l than 1.81' volts / cell.

l Once'per 60-month interval, the Performance Discharge Test may be l ' performed in lieu of the battery Service Discharge Test in l Surveillance Requirement 5.6.2.d.

1 f. At least- once per 18 months, ouring REACTOR SHUTDOWN, by a l Performance Discharge Test of battery capacity on any battery l that shows signs of abnormal degradation or has reached 85% of I the service life expected for the application. Abnormal l degradation is indicated when the battery capacity drops more l than 10% of rated capacity from its average on previous l performance . tests, or is below s'5% of the manufacturer's rating l for Station Batteries 1A and IB and below 90% for Station Battery l IC.

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, Fort St..Vrain~ #1.-

u ... s 4 = Technical Specifications

Amendment No.

Page.5.6-5

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-l: . TABLE'5.6.2-1 -

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.- BATTERY SURVEILLANCE. REQUIREMENTS l

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'l'l- 11 l- 1. i 1 - l- .II (1) l (2) l q l-l ll. CATEGORY-A l CATEGORY B l .l l1 il i I iI ll . l . .

I i 1 -l 11 . Pilot Cell l- Connected Cell (s) l  !

l'. I ll 1 I a '

l l-- ll l .l . (3) l l-l Parameter -llLimits Ilimits l Allowable.value. l '

-l 1 -Il l I I II ll l l I: 1 '

li II I I . l I l Electrolyte ll Greater than [ Greater than lAbove top of l l l Level ll minimum level Iminimum-level l plates, and not l- j l l- -ll indication mark, l indication mark, l overflowing. 1 l 'l- lland less-than land less than .l l  ;

- ll l lone quarter inch lone quarter inch l l. ,1 l ~ l' llabove maximum- .Iabove maximum l l  :)

-l.I ll level. indication llevel indication-l l j ll ll mark, jmark. l l .!

ll ll l l 1. 1

- l I- Il I l I

l l Float ll2 2.13 volts It 2.13 volts- l2 2.07 volts- l j

'l IVoltage l l- l _( 4) l l Ii 11 I I I l l- .

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l 1 l l Specific -113-1.210 13 1.195'for leach connected l-l l Gravity (5) 11

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leach connected- l cell not more- 1 Il ll l cell. lthan .020 below l ll ll. l lthe average of I 1 ll ll l lall connected l  ;

ll ll 1 lcells. I II il I l' 1. 1 1I Il- l 1 l-ll ll l Average of all l Average of all l 1l ll l connected cells l connected cells l- ,

ll ll l> 1.205. l> 1.195. l j il 11 i I ._I 1 J

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.I '( )' refer to notes on following page. I

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, . , ' Fort St..Vrain #1

. . . .  : Technical Specifications Amendment No.

, , Page 5.6-6, l Notes for Table 5.6.2-1:

1. (1) .For any Category A parameter (s) outside' the' limit (s) shown, the l ~ battery may.be considered'0PERABLE provided.that within.24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> l all the Category B measurements are taken and found.to be within l their allowable values, and provided the Category' -A and B' l . parameter (s) are restored - to within- limits 'within the next l 6 days.

l (2) For any Category B parameter (s) outside'the limit (s) shown,; the j battery may be considered OPERABLE provided:that the Category B l parameters are within their allowable values and provided the l Category B parameter (s) are restored to within limits within-l 7 days.

. l (3)- If any Category B parameter is not within its allowable value,a

! l declare the battery inoperable.

l (4) Measured' cell voltages of cells warmer than average may be, l corrected for electrolyte temperature, if measured cell voltage

.l 1s less than the acceptance criteria.

l (5) Corrected for electrolyte temperature and level.

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Fort' St. Vrein'#1 .

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.-- ..l. .- -Technical Specifications Amendment No~.

Page 5.6-7:

l Basis for Specification SR 5.6.2 l The. surveillance requirement for demonstrating the operability of at 1

.l least .two. of the 1A, 18 and 1C-'battaries is -based on -the-l' recommendations of Regulatory Guide.1.129, " Maintenance Testing and

l. Replacement of Large Lead Storage Batteriss for' Nuclear. Power

1. Plants,'.. February - 1978, and IEEE. Std 450-1987, "IEEE Recommended l Practice for Maintenance, Testing, and Replacement of Large- Lead-l Storage Batteries for Generating Stations and Substations."

P l1 Verifying average electrolyte temperature above the minimum for which l the battery was sized, total battery terminal voltage on float l' charge, connection resistance values, and the. performance of. battery l servi _ce discharge and' performance discharge tests ensures the l effectiveness .of the charging system, the ability of the battery to l handle high' discharge' rates, and the adequacy of the battery capacity-l with respect to.the rated capacity and emergency load requirements.

' l . Table. 5.6.2-1 specifies the normal limits for each designated pilot l cell and each connected cell for electrolyte level, float voltage, l and specific gravity. The limits for the designated pilot cell float l voltage and specific gravity, greater than or' equal to 2.13 volts and

.l-specific gravity of 1.210 are characteristic of a charged cell with

. I adequate capacity. The normal limits for each connected cell for l float voltage and specific gravity, greater than or equal to 2.13 l . volts and n'ot more than 0.020 below the full charge specific gravity -

I of 1.215 with an average specific gravity of all the connected cells l not more than 0.010 below the full charge specific ravity' of 1.'215, I ensures the operability and capability of the battet/.

l-Operation with a battery cell's parameter outside the normal limit l but within the allowable value specified .in Table 5.6.2-1 . is l permitted for up to 7 days as described in the notes 'for -

l Table 5.6.2-1. During this 7-day period: (1) the allowable values l for electrolyte level ensures no physical damage to the plates with

-l an adequate electron transfer capability; (2) the allowable value for I the average specific gravity of all the cells, not more than 0.020 l-below the recommended full charge specific gravity, ensures that the-I decreases in rating will be less than the safety margin provided in l sizing; (3) the allowable value for an individual cell's specific l gravity, not more than 0.020 below average of all connected cells, I ensures that the overall capability of the battery will be maintained

.l within an acceptable limit; and (4) the allowable value for an j individual cell's float voltage, greater than 2.07 volts, ensures the l battery's capability to perform its design function.

l The Performance Discharge Test is to be performed based on the I recommendations of IEEE Standard 450-1987. The 340 ampere discharge I rate for Batteries 1A and IB and the 183 ampere discharge rate for ,

l Battery IC are the recommended 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> rates. 1

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ATTACHMENT 3 I

To P-89264 NO SIGNIFICANT HAZARDS CONSIDERATION Af4ALYSIS l

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g P-89264 Attachment.3-Page 1 of_3' SYSTEM DESCRIPTION

The Fort. St. . Vrain: system consists of two DC buses, three 125 VDCJ batteries, and.four battery chargers as shown in Figure 1. :The' two-station batteries, . Batteries 1A and _1B, supply power for the.two separate.and normally independent DQ buses 'which feed two- of the three. instrument power. inverters. The PPS battery, battery IC, supplies power for the. third instrument power- inverter which feeds-th_e non-interruptible 120.VAC power to the third channel of the PPS.

Three of the four battery chargersiare: powered dinectly. from the 480 VAC~. essential buses and maintain the proper charge on each of the 1

.three 125 VDC-batteries and supply DC power during normal ' operation.

, The fourth battery charger -(fed from an essential MCC) provides a

• " backup source of DC power to the DC buses.

o GAEKGROUND:

During .the-...latter opart of 1988, Public Service Company of Colorado

'(PSC). replaced the three lead calcium batteries, IA, IB, and IC, with lead : antimony batteries. With -the replacement of. the three batteries, PSC has;also' reviewed the surveillingof the batteries'and preventive- maintenance procedures. In accordance'with this review,

.PSC is submitting these revised Technical-Specification Surveillance Requirements for the batteries.

The' revised requirements have been developed using the. Westinghouse Standard Technical- Specifications, Regulatory Guide 1.129, .IEEE Standard 450-1987,. vendor recommendations, and an analysis of four

--hour Battery Load Profile ~ Requirements. This submittal is very similar to the Surveillance Requirements, SR 4.8.2,1, already reviewed by the NRC in conjunction with PSC's Technical Specification Upgrade Program (TSUP).

Verifying total battery terminal voltage on float charge, average electrolyte temperature above the minimum for which the battery was sized, connection resistance values, the performance of battery Service Discharge and Performance Discharge Tests, and the performance of battery charger tests ensures the effectiveness.of the charging system, the ability of the battery to handle high discharge rates, and the adequacy of the battery capacity with respect to the rated capacity and emergency load requirements.

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l P-89264 Attachment 3 Page 2 of 3 Table 5 6.2 I specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage, and specific gravity. The limits for~the designated pilot cell float voltage and specific gravity, greater than or equal to 2.13 volts and specific gravity of 1.210, are characteristic of a charged cell with adequate capacity. The normal limits for each connected cell for float voltage and specific gravity, greater than or equal to 2.13 volts and not mo e than 0.020 below the full charge specific gravity of 1.215 with an avt. age specific gravity of all the connected cells not more than 0.010 below the full charge specific gravity of 1.21'5, ensures the operability and capability of the' battery.

Operation with a battery cell's parameter outside the normal limit but within the allowable value specified in Table 5.6.2-1 is permitted for up tt- 7 days as described in the notes for Table 5'.6.2-

1. During this 7-day period: (1) the allowable values for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (,2) the allc,wable value for the average specific gravity of all the cells, not more than 0.020 below the recommended fell charge specific gravity, ensures that the decreases in rating wiil be less than the safety margin provided in sizing; (3) the allowable value for an' individual cell's specific gravity, not more than 0.020 below ave' rage of all connected cells, ensures that the overall capability of the battery will be maintained within an acceptable limit; and (4) the allowable value for an individual cell's ficat voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function. The voltage values are taken from the Westinghouse Standard Technical Specifications, IEEE Standard 450-1987, and vendor recommendations.

The specific gravity values are taken from vendor recommendations, Westinghouse Standard Technical Specifications, and confirmed by in plant tests. Action times are taken from the Westinghouse Standard Technical Specifications.

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P-89264' C Attachment 3 Page 3 of;3 L. . ,

EVALUATION:

.PSC has evaluated the proposed , amendment request'forcsignificant.

, hazards consideration using the standards in ~JTitle 10, Code of Federal Regulations, Part 50.92. The proposed amendment < request:

involves no,significant hazards consideration,' since. the proposedL .

amendment would not:

1. . Involve'a1significant'increaseLin the probability'or consequences of an accidentLpreviously~ evaluated.

The operation of-the batteries, the: Fort St. Vrainfplant, and the.

. plant. safety' systems are not_ being ' changed. The. battery" surveillance are being improved. The battery Service'Di'scharge Test schedule has been established at- 18 . months in' accordance with' the' Westinghouse: Standard Technical Specifications and a-

< Performance Discharge Test has been'added in accordance with'IEEE, L Standard 450-1987- .

2. Create .the possibility 'of a'new or different kind of accident from any'previously evaluated.

No change .i s being made to the operation.of the batteries,.the Fort St. Vrain pla'nt, or plant safety systems. The only changes _

being made are designed to improve the reliability of the batteries.

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L 3. Involve a significant reduction in a margin of safety.

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- The proposed changes are designed to improve the reliability of

! the batteries. The surveillance are in accordance with vendor k recommendations and IEEE guidance.

CONCLUSION:

Based on the above evaluation, it is concluded that operation of Fort St. Vrain in accordance .with the proposed changes will involve no significant hazards consideration. PSC considers the proposed changes to be an improvement in the overall plant reliability and documentation as the new surveillance and testing requirements are designed to improve battery performance.

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