ML20099H120

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Proposed TS Surveillance Requirement 4.9.A Re Auxiliary Electrical Equipment & Bases 4.9 Re Svc Discharge Test
ML20099H120
Person / Time
Site: Pilgrim
Issue date: 08/10/1992
From:
BOSTON EDISON CO.
To:
Shared Package
ML20099H114 List:
References
NUDOCS 9208180140
Download: ML20099H120 (8)
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Text

l ATTACHMENT B Station and Switchyard Batteries Revised Surveillance Test and Bases Paaes 195 196 no changes - included for re-pagination 201 i.

9208180140 920810 PDR ADOCK 05000293 P pop Ek

A J

11MITING 30NDITIONS FOR OPERATION SUPUILLANCE REOUIREMENTS

'3.9.A AUXILIARY ELECTRICAL EOUIPMENI 4.9.A AUXILIARY ELECTU CAL EOUIPMENT (Cont'd)- SURVEILL/MCf (Cont'd)

4. 4160 volt buses A5 and A6 are d. Once a month the quantity of energized and the associated 480 diesel fuel available shall vcit busc> are energized. be logged.
5. The station and switchyard 125 and e. Once a month a sample of 250 volt batteries are operable. diesel fuel shall be checked Each battery shall have an for quality in accordance operabie battery charger, with ASTM 04057-81 or D4177-82. ihe quality shall
6. Emergency Bus Degraded Voltage be within the acceptable Annunciation System as specified limit; specified in Table 1 in Table 3.2.B.1 is operable, of ASTM D975-81 and logged.
7. Spgi fi cation 2. Station and Switchyard Batteries Two redundant RPS Electrical a. E'rery week the specific Protection Assemblies (EPAO shall gravity, the voltage and be operable at all times on both temperature of the pilot cell inservice power supplies. and overall battery voli +N shall be measured and la. @ d.
b. Every three months the
a. Hith one EPA on an inservice measurements shall be made of power supply inoperable, voltage of each cell to continud operation is nearest 0.1 volt, specific permissible provided that the grivity of each ceil, and EPA is returned to operable temperature of every fifth status or power is transferred cell. These measurements to a source with two operable shall be logged.

EPAs within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If this requirement cannot be met, trip c. Once each operating cycle, the power source. the stated batteries shall be subjected to a 5..vice l

b. With both RPS EPAs found to be Discharge Test (load [

inoperable on an inservice profile). The specific l power supply, continued- gravity ana voltage of each operation is permissible, cell shall be determined provided at least one EPA is after the discharge t.nd restored to operable status or logged.

power is transferred to a source with at least one d. Once every five years, the I operable EPA within 30 stated t,atteries shall be l minutes. If this requirement subjected to a Performance l cannot be met, trip the power Discharge Test (capacity). I source. This test will be performed I in lieu of the Service l NOTE: Only applicable if tripping the Discharge Test requirement of I power source would not result in a 4.9.A.2.c above. l scram, t

195 Amendment No. 42, 67, 96, 127

LIMITING CONDITION FOR OPERATION SURVEILLANCE REOUIREMENTS 3.9.5 Ooeration with Inocerable 4.9.A Auxiliary Electrical Eautoment Eggioment Surveillance (Cont'd)

Whenever the reactor is in Run 3. Emergency 4160V Buses A5-A6 Mode or Startup Mode with the- Degraded Voltage Annunciation rea: tor not in a Cold Condition, System. .

the availability of electric power shall be as specified in 3.9.B.1, a. Once each operating cycle, 3.9.B.2, 3.9.B.3, 3.9.B.4, and calibrate the alarm sensor.

3.9.B.5.

b. Once each 31 days perform a
1. From and after the date that channel functional test on incoming power is not available the alarm system.

from the startam or shutdown transformer, contin A' m ctor c. In the event the alarm system operation is permissible unaer is determined inoptrable this condition for seven days, under 3.b above, commence During this period, both diesel logging safety related bus generators and associated voltage every 30 minutes emergency buses must be until such time as the alarm "

demonstrated to be operable, is restored to operable status.

2. Frora and after the date that y incoming power is not available 4. RPS Electrical Protection from both startup and shutdown Assemblies transformers, continued operation is permissible, provided both a. Each pair of redundant RPS diesel generators and associated EPAs shall be determined to emergency buses are demonstrated be operable at least once per g to be operable, all core and 6 months by performance of an containment cooling systems are instrument functional test.

operable, reactor power level is reduced to 251.-of_ design and the b. Once per operating cycle, NRC is notified within-one (1) each pair of redundant RPS hour as required by 10CFR50.72. EPAs shall be determined to be operable by performanca of

3. From and after the date that one an instrument calibration and -

of the diesel generators-or by verifying tripping of the associated emergency bus is made circuit breakers upon the-or found to be~ inoperable for any simulated conditions for reason,' continued reactor automatic actuation of the operation i_s permissible in protective relays within the accordance with Specificatic, following limits:

3.5.F if Specificatior. 3.9. A.1 and

.3.9.A.2.a are satisfied. Overvoltage 1 132 volts Undervoltage 1 108 volts

- 4 .- From and after the date-that one Underfrequency 1 57H z of the diesel generators or

ssociated emergency buses and either the shutdown or startup transformer power source are made Amendment No. 88, 127 196

4 b1SJji: (Cont'd) 4.9 deliver full flow. Periodic testing of the various components, plus a functional test once per cycle, is sufficient to maintain adequate reliability.

Although station batteries will deteriorate with time, utility experience indicates there is almost no possibility of precipitous failure. The type of surveillance described in this specification has been demonstrated over the years to provide an indication of a cell becoming irregular or unserviceable long before it becomes a failure.

The Service Discharge Test provides indication of the batteries' ability to satisfy the design requirements (battery duty cycle) of the associated de system. This test will be performed using simulated or actual lot.is at the rates and for the duration specified in the design load profile. A once per cycle testing interval was chosen to coincide with planned outages.

The Performance Discharge Test provides adequate indication and assurance that the batteries have the specified ampere hour capacity. The results of these tests w;11 be logged and compared with the manufacturer's recommendations of acceptability. This test is performed once every five '

years in lieu of the Service Discharge test that would normally occur within that time frame.

The diesel fuel oil quality must be checked to ensure proper operation of the diesel generators. Water content should be minimized because water in the fuel could contribute to excessive damage to the diesel engine.

The electrical protection assemt' lies (EPAs) on the RPS inservice power supplies, either two motor generator sets or one motor generatoc and the alternative supply, consist of protective relays that trip their incorporated circuit breakers on overvoltage, undervoltage, or underfrequancy conditions.

There are two EPAs in series per power source.- It is necessary to periodically test the relays to ensure the sensor is operating correctly and to ensure the trip unit is operable. Rasea on experience at conventional and nuclear power plants, a six-month frequency for the channel functional test is established. This frequency is consistent with the Standard Technical Specifications.

The EPAs of the power sources to the RPS shall be determined to Se operable by performance of a channel calibration of the relays once per op' crating cycle. During calibration, a transfer to the alternative power soune is required; however, prior to switching to alternative feed, de-energization of the applicable MG set power source must be accomplished. This results in a half scram on the channel being calibrated until the alternative power sourt is connected and the half scram is cleared. Based on operating experience, drift of the EPA protective relays is not significant. Therefore, to avoid possible spurious scrams, a calibration frequency of once per cycle io established.

Amendment flo. 127, 135, 141 201

9 ATTACliMENT C Station and Switchyard Battgr_ig Markec-Up Technical Specification and Ba;es Page_1 195 201

. . . ' LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REOUIRENENTS 1

3.9.A AUXILIARY ELECTRICAL EOUIPMEMr 4.9.A AUXILIARY ELECTRICAL EOUIPMENT (Cont'd) _

SURVEILLANCE (Cont'd)

4. 4160 volt buses A5 and A6 are d. Once a month the quantity of energized and the associated 480 diesel fuel available shall

-volt buses are energized. be logged.

5. The station and switchyard 125 and e. Once a month a sample of 250 volt batteries are operable. diesel fuel shall be checked Each b;ittery shall have an for quality in accordance operable battery chargtr. wi+h ASTN D4057-81 or D4177-82. The quality shall j 6. Emergency Bus Degraded Voltage be within the acceptable j Annunciation System as specified limits specified in Table 1 in Table 3.2.B.1 is operable, of ASTM 0975-81 and logged.

V ' 7. Snecification 2. Station and Switchyard Batteries Two redundant RPS Electrical a. Every week the specific Protection Assemblies (EPAs) shall gravity, the voltage and be operable at all t~mes on both . temperature of the pilot cell inservice power supplies. and overall battery voltage shall be measured and logged.

Action i _

b. Every three months the
a. With one EPA on an inservice measurements shall be made of j power supply inoperable, voltase of each cell to continued operation is nearest 0.1 volt, specific permissible provided that the gravity of aach cell, and EPA is returned to operable temperature of every fifth status or power is transferred cell. These measurements I' to a source with two operable shall be logged.

I EPAs within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If this m, f requirement cannot be met, trip c. Once each operating cycle the power source. the stated batt.eJ i e M pg b p .g subjected to a'hted lesd j

! b. With both RPS EPAs found to be d45 darge-test. The specific g7s,/, -

{ inoperable on an inservice gravity and voltage of each power supply, continued cell shall be determined operation is permissible, after the discharge and

{ , provided at least one EPA is logged.

\ restored to operable status or d. g power is transferred to a 3. Emergency 4160V Buses AS-A6 source with at least one Degraded Voltage Annunciation

!' operable EPA within 30 System.

minutes. If this requirement cannot be met, trip the power a. nce each operating cycle, source. calibrate the alarm sensor.

NOTE: Only applicable if tripping the . Once each 31 days perform a channel functional test on

/ power scram. source would not result in a the alarm system.

O st s t e- s

  • 9 /o ve. y t n],

a , ,h f.d bafra...> .1im /4,)

Rev3stonM36 #* Y *#0 # * ~ ' ' ' '

A.nendment No. 42, 61, 96. A27' T J 6 e " E )- /l" 195 1 f n / .. u e r / # /* - < # e' I~ #l' l ga fn . O., u t. ., r % l m "' * ~ d

fLA1LS: (Cont'd) i

. 4.9 deliver full flow. Periodic tescing of the various components, plus a functional test once per cycle, is sufficient to maintain adequate reliability' Although station batteries will deteriorate with time, utility experience indicates there is almost no possibility of precipitous failure. The type of y' surveillance described in thi. sne.;fication has been demonstrated over the 6 years to provide an indication of a c~ ell becoming irregular or unserviceable U l_on_g before it_becom_es_ a failjur fin addHTon, thT~cheHs describ'EU7150

~

~c;.2_-

'provid&~ adequate indicaTron that the batteries have the specified ampere hp (xapabi1ity.f-c s

N ____._

(o o / The diesel fuel oil quality must be checked to ensure proper operation of the p [ diesel generators. Hater content should be minimized because water in the fuel could con' ibute to excessive damage to the diesel engine.

The electrical protection assemblies (EPAs) on the RPS inservice power d l

supplies, either two motor generator sets or one motor generator and the f alternative supply, consist of protective relays that trip their incorporated I circuit breakers on overvoltage, undervoltage, or underfrequency conditions. l There are two EPAs in series per power source. It is necessary to l]

periodically test the relays to ensure the sensor is operating correctly and >

to ensure the trip unit is operable. Based on experience at conventional and nuclear power plants, a six-ronth frequency for the channel functional test is (

established. This frequency is consistent with the Standard Technical Specifications.

The EPAs of the power sources to the RPS shall be determined to be operable by performance of a channel calibration of the relays once per operating cycle.

During calibration, a transfer to the alternative power source is required; '

however, prior to switching to alternative feed, de-energi2ation of the h applicable MG set power source must be accomplished. This results in a half a scram on the channel being calibrated until the alternative power source is connected and the half scram is cleared. Based on operating experience, drif t I

of the EPA protective relays is not significant. Therefore, to avoid possible spurious scrams, a calibration frequency of once per cycle is established.

l l

l l

ww' ,

Amendment No. 127. 12f, f.O 201

~

V INSERT "A" TO BASES The Service Discharge Test provides indication of the batteries' ability to satisfy the design requirements (battery duty cycle) of the associated dc system. This test will be performed using simulated or actual loads at the rates ano for the duration specified in the design load profile. A once per cycle testing interval was chosen to coincide with planned outages.

The Performance Discharge Test provides adequate indication and assurance that the batteries have the specified ampere hour capacity. The results of these tests will be logged and compared with the manufacturer's recommendations of acceptability. This test is performed once every five years in lieu of the Service Discharge test that would normally occur within that time frame.

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