ML20084Q578

Proposed TS 3.8.1.1 - Ac Power Sources,Operating,Increasing Allowed Outage Time Period for One EDG Being Inoperable from 72 H to 7 Days

ML20084Q578
Person / Time
Site:	Davis Besse
Issue date:	06/01/1995
From:	CENTERIOR ENERGY
To:
Shared Package
ML20084Q572	List: ML20084Q570 ML20084Q575 ML20084Q578
References
NUDOCS 9506080662
Download: ML20084Q578 (8)

Text

.- - - - . . . -. .

,.LAR 95-0005

' _Psge 12 3/4.8 ELECTRICAL POWER SYSTEMS t 3/4.8.1 A.C. SOURCES

' OPERATING  !

LIMITING CONDITION FOR OPERATION 3.8.1.1-As a minimum, the following'A.C. electrical power sources shall be OPERABLE:  !

a. Two independent circuits between the offsite transmission network and the l onsite Class 1E distribution system, each consisting of:

1. One OPERABLE 345 KV transmission line.  !

2. One OPERABLE 345-13.8 KV startup transformer, and .

3. One OPERABLE 13.8 KV bus, and  ;

b. Two separate and independent diesel generators each with:

1. A separate day fuel tank containing a minimum volume of 4000 gallons of fuel. 7 I

2. A separate fuel storage system containing a minimum volume of 32.000 gallons of fuel.-and .

3. A separate fuel transfer pump.  !

APPLICABILITYr MODES 1, 2. 3 and 4. j ACTJON: i i

With on# either an offsite circuit er diesel generater of the above required

~

a. ,

A.C. Electrical power sources inoperable, demonstrate the OPERABILITY of the l remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a i within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter and by performing i Surveillance Requirement 4.8.1.1.2~.a.4 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Restore at least two  :

offsite circuits and twe dic:01 generaters to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> j or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN  !

within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.  :

bE

~

"JWithTone7dieseligenbratbr?ofithePaboWiVsq"OlfedWCE lecth1MTipfw6Msbepces inoperableKdemonstrate)the:0PERABILITfofithegemailiingeA104sourcesbf^~ ^  ;

performing!SurveillanceRequirement:42811ililsafwith1nione?houryandlati}6ast l once per;8thours!thereafterzand by7performingfSurve111ancetRequirement  :

4.8;17112.a(4Lwithirp24(hourshiRestore?at41eastitwoTdieseligeneratorMtd OPERABLEEstatusiwithin W daysiorjbetin4HOTkSTANDBY;withinktheinext M ourQ"Bhd " ~ ~"

jn1 COLD; SHUTDOWN]withinithelfallowing(30ihoursi JE~ ~~~

tb.

~

With one offsite circuit and one diesel generator of the above required A.C. I electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter and by performing Surveillance Requirement 4.8.1.1.2.a.4 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. Restore at least one of the inoperable sources to OPERABLE status within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. WithNthelinoperabl eToffsiteisodrce r restbred ErbitoFeltWoldi e5e1 generatorsfto OPERABLELstatusiwithin:17Cdaysif rom f thei:timeiof t thE d niti al 06ss oribenin:at leastcHOT STANDBYHwithinJthe next?6ihours'and)in COLDiSHUTDOWN' within. thefo}1owingi301hoursj ~ Rest 6r'c stleist" tf^ ~~~' ' ~

DAVIS-BESSE. UNIT 1 3/4 8-1 Amendment No. 6.97 9506000662 950601 PDR ADOCK 05000346 P PDR

, LAR 95-0005 Pege 13 ELECTRICAL POWER SYSTEMS ACTION (Continued)

Offsite circuit; and two dic cl generators to OPEPABLE statu:  ;

within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> frem the time of initial 1000 cr be in at least nnv+ C hni e r c ,rA 4n pal n CUf fTNAUM u4+hin UAT CTAMnDV ui+h4n +hn

'EE t fEUcUn Ed Ic$ri . 'UftbNh5Iin5N5f$N15!5Is5NNh655F5t5 Festbred Srbs[torsItso75ffsigpoWerssourcesi tol0PERABLE sithin:72 hourssfromitheittnecof.ithehinitf ahlssportbei:infat' ileast? HOTJ STANDBY!W1 thi nTthe; nsxt L6thours:Tand?in!!COLDiSHUTDOWN i kithin;;thejfolloWing?3.0300rsi " ~ ~ ~ ~ ~ ~~ ~~^^ * ~ l de.

~

With two of the above required offsite A.C. circuits inoperable.

demonstrate the OPERABILITY of two diesel generators by performing Surveillance Requirement 4.8.1.1.2.a.4 within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, unless the diesel generators are already operating: restore at least one of the inoperable offsite sources to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. With only one offsite source restored, restore at least two offsite circuits to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> from time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

6d. With two of the above required diesel generators inoperable, demonstrate the OPERABILITY of two offsite A.C. circuits by performing Surveillance Requirement 4.8.1.1.1.a within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter: restore at least one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. Restore at least two dieselgeneratorstoOPERABLEstatuswithin7fddy?72hoursfrom time of initial loss or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVElLLANCE REOUIREMENTS 4.8.1.1.1 Each of the above required independent circuits between the offsite transmission network and the onsite Class 1E distribution system shall be:

a. Determined OPERABLE at least once per 7 days by verifying correct breaker alignments and indicated power availability, and

b. Demonstrated OPERABLE at least once per 18 months during shutdown by transferring (manually and automatically) unit power supply to each of the 345 KV transmission lines. **

4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE:

a. At least ence per 31 days on a STAGGERED TEST BASIS if Surveillarce Requirement 4.8.1.1.2.c has not been performed within the previous 31 days, by:

• • The 18 month surveillance which is due on March 1. 1988 may be delayed until April 1.1988.

DAVIS-BESSE. UNIT 1 3/4 8-2 Amendment No. 97 IO7

, LAR 95-0075 ELECTRICAL POWER SYSTEf15 INFORilATION ONLY 7']

v SURVEILLANCE REQUIREtiENTS (Continued)

1. Verifying the fuel level in the day fuel tank.

2. Verifying the fuel level in the fuel storage tank.

3. Verifying the fuel transfer pump can be started and ~trans-fers fuel from the storage system to the day tank.

4. Verifying the diesel starts and accelerates up to 900 rpm, preceded by an engine prelube and/or appropriate other warmup procedures.

5. Verifying the generator is synchronized, loaded to 1 1000 kw, and operates for 1 60 minutes.

6. Verifying the diesel generator is aligned to provide standby power to the associated essential busses.

7. Verifying that the automatic load sequence timer is OPERABLE with each load sequence time within i 10% of its required value.

b. At least once per 92 days by verifying that a sample of diesel fuel from the fuel storage tank is within the acceptable limits i specified in Table 1 of ASTri D975-68 when checked for viscosity, p) water and sediment.

l

c. At least once per 184 days on a' STAGGERED TEST BASIS by: l

1. Verifying the fuel level in the day fuel tank.

2. Verifying the fuel level in the fuel storage tank.

3. Verifying the fuel transfer pump can be started and transfers fuel from the storage system to the day tank. j

4. Verifying the diesel starts from ambient condition and accelerates to at least 900 rpm in < 10 seconds.

5. Verifying the generator is synchronized, loaded to 1 1000 kw, and operates for 1 60 minutes. l

6. Verifying the diesel generator is aligned to provide '

standby power to the associated essential busses.

7. Verifying that the automatic load sequence timer is OPERABLE with each load sequence time within i 10% of its required value.

D -

Q

~

DAVIS-BESSE, UNIT 1 3/4 B-2 Amendment No. 75,97,105

LAR 95-0005

" INFORMATION ONLY ELECTRICAL POWER SYSTEMS g gSURVEILLANCEREQUIREMENTS (Continued)

I

d. At least once per 18 months during shutdown by: 1

1. Verifying the generator capability .to reject a load equal i to the largest single emergency load supplied by the .

generator without tripping.

2. Simulating a loss of offsite power in conjunction with a i safety features actuation system (SFAS) test signal, and:

(a) Verifying de-energization of the essential busses and load shedding from the essential busses.

(b) Verifying the diesel starts from ambient condition on the auto-start signal, energizes the essential busses with permanently connected loads, energizes the auto-connected essential loads through the load sequencer and operates for > 5 minutes while its generator is loaded with the essential loads.

(c) Verifying that all diesel generator trips, except .

engine overspeed and generator differential, are automatically bypassed upon loss of voltage on the essential-bus and/or an SFAS test signal.

3. Verifying the diesel generator operates for > 60 minutes i while loaded to > 2000 kw.

4. Verifying that the auto-connected loads to each diesel i generator do not exceed the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> rating of 2838 kw.

e. At least once per 30 months by subjecting the diesels to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recomendations for this class of standby service.*

• The provisions of Specification 4.0.2 are not applicable.

I I  ;

DAVIS-BESSE, UNIT 1 3/4 8-4 Amendment No. 97 J M ,141 l

t

. LAR 95-0005 Page 16 y/4.8 3 ELECTRICAL POWER SYSTD(S INFORMATION ONLY BASES The OPERABILITY of the A.C. and D.C. power sources and associated distribu-tion systema during operation ensures that sufficient power will be available to sapply the safety related equipment required for 1) the safe shutdown of the facility and 2) the mitigation and control of accident conditions within the facility. The minimum specified independent and redundant A.C. and D.C. Power sources and distribution systems satisfy the requirements of General Design Criterion 17 of Appendix "A" to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of tbe .

power sources provide restriction upon continued facility operation commensurate with the level of degradation. De. OPERABILITY of the power sources are consistent with the initial cond.ition assumptions of the safety analyses and are based upon maintaining at lasst one of each of the

{;onsiteA.C.andD.C.powersourcesandassociateddistributionsystems

. OPERABLE during accident conditions coincident with an assumed loss of

j of fsite power and single f ailure of the other onsite A.C. source.

lITheOPERABILITYoftheminimumspecifiedA.C.andD.C.powersourcesand

.; associated distribution' systems during shutdown and refueling ensures that

((1)thefacilitycanbemaintainedintheshutdownorrefuelingcondition i far extended time periods and 2) sufficient instrumentation and control

, capability is available for nonitoring and maintaining the facility status.

{TheSurveillanceRequirementsfordemonstratingtheOPERABILITYofthe

. station batteries are based on the recommendations of Regulatory Guide +

' 1.129. " Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants". February 1978. and IEEE Std. 550-M80. "IEEE

! ' Recommended Practice for Maintenance. Testing, and Replacement of 1.arge  !

Lead Storage Batteries for Generating Stations and Substations".

Verifying average electrolyte temperature above the minimum for which the i . battery was sized, total battery terminal voltage on float charge. connec-

. tion resistance values and the performance of battery service and discharge I tests ensures the effectiveness of the charging system, the ability to  ;

I handle high discharge rates and compares the battery capacity at that ti=e with the rated capacity.

Table 4.8-1 specifies the normal limits for each designated pilot cell iand each connected cell for electrolyte level, float voltage and specific l gravity. The limits for the designated pilot cells float voltage and specific gravity, greater than 2.13 volts and .015 below the manufacturer's full charge specific gravity or a battery charger current of less than two amps is characteristic of a charged cell with adequate capacity. The normal limits for each connected cell for float voltage and specific gravity.

greater than 2.13 volts and not more than .020 below the manuf acturer's full charge specific gravity with an average specific gravity of all the connected cells not more than .010 below the manufacturer's full charge specific gravity. ensures the OPERABILITY and capability of the battery. Exceptions '

to the specific gravity requirements are taken to allow for the normal deviations experienced after a battery discharge and subsequent recharge l

associated with a service or performance discharge test. The specific gravity deviations are recognized and discussed in IEEE 450-1980.

ll i

iiDAVIS-BESSE. UNIT 1 B ^,/4 8-1 Amendment No. 100. 158

, -LAR 95-0005 '

Page 17 INFORMATIC N ONLY 3/4.8 ELECTRICAL POWER SYSTEMS BASES .

Operation with a bactery cell's parameter outside the normal limit but within the allowable value specified in Table 4.8-1 is permitted for up (1) the allowable value to seven days. During this seven-day period:

for electrolyte level ensures no physical damage to the plates with an cdequate electron transfer capability; (2) the allowable value for the everage specific gravity of all the cells, not more than .020 below the manufacturer's recommended full charge specific gravity, ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity, ensures that an individual cell's specific gravity will not be more than .040 below the manuf acturer's full charge specific gravity and that the overall capability of the battery will be maintained within an ecceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perf orm its design function.

i 1

i DAVIS-BESSE, UNIT 1 B 3/4 8-2 Amendment No. 100

. 1.AR 95-0005' Page 18 i .'

APPLICABILITY BASES 3.0.5 This specification delineates what additional conditions must be satisfied to permit operation to continue, consistent with the ACTION state-ments for power sources, when a normal or emergency power source is not OPERABLE. It specifically prohibits operation when one division is inoperable because its normal or emergency power source is inoperable and a system, subsystem, train, component or device in another division is inoperable for another reason.

The provisions of this specification permit the ACTION statements associated with individual systems subsystems. trains, components, or devices to be consistent with the ACTION statements of the associated electrical )ower source. It allows operation to be governed by the time limits of t1e ACTION statement associated with the Limiting Condition for Operation for the normal or emergency power source, not the individual ACTION statements for each system, subsystem, train, component or device that is determined to be inoperable solely because of the inoperability of its normal or emergency power source.

For example. Specification 3.8.1.1 requires in part that two emergency diesel generators be OPERABLE. The ACTION statement provides for a E day 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> out-of-service time when one emergency diesel generator is not"0PERABLE. If the definition of OPERABLE were applied without consideration of Specification 3.0.5. all systems, subsystems. trains, components and devices supplied by the inoperable emergency power source would also be inoperable. This would dictate invoking the applicable ACTION statements for each of the applicable Limiting Conditions for Operation. However, the provisions of Specification j 3.0.5 permit the time limits for continued operation to be consistent with the  :

ACTION statement for the inoperable emergency diesel generator instead, i provided the other specified conditions are satisfied. In this case, this l

would mean that the corresponding normal power source must be OPERABLE and l all redundant systems, subsystems, trains, components. and devices must be ,

OPERABLE. or otherwise satisfy Specification 3.0.5 (i.e. , be capable of  !

performing their design function and have at least one normal or one emergency 1 power source OPERABLE). If they are not satisfied, action is required in l accordance with this specification.  !

As a further example. Specification 3.8.1.1 requires in part that two physi-  ;

cally independent circuits between the offsite transmission network and the I onsite Class IE distribution system be OPERABLE. The ACTION statement i provides a 24-hour out-of-service time when both required offsite circuits are j not OPERABLE. If the definition of OPERABLE were applied without consider-ation of Specification 3.0.5: all systems, subsystems, trains, com3onents and devices supplied by the inoperable normal power sources, both of t1e offsite circuits, would also be inoperable. This would dictate invoking the applica-ble ACTION statements for each of the applicable LCOs. However, the provi-sions of Specification 3.0.5 permit the time limits for continued operation to be consistent with the ACTION statement for the inoperable normal power sources instead, provided the DAVIS-BESSE. UNIT 1 B 3/4 0-la Amendment No. 7I Correction Letter 8/9/84

. LAR 95-0005 Page 19

/ .'

-- INFORMATION ONLY BASES other specified conditions are satisfied. In this case. this would mean that for one division the emergency power source must be OPERABLE (as must be the components supplied by the emergency power source) and all redundant systes, subsystems, trains, components and devices in the other division must be OPERABLE. or likewise satisfy Specification 3.0.5 (i.e., be capable of per-feming their design functions and have an emergency power source OPERABLE).

In other words, both emergency power sources must be OPERABLE and all redundant systems, subsystems, trains, components and devices in both divisions l must also be OPERABLE. If these conditions are not satisfied. action is  :

required in accordance with this. specification.

In MODES 5 or 6. Specification 3.0.5 is not applicable, and thus the individual ACTION statments for each applicable Limiting Condition for Operation in these MODES must be adhered to.

l l

l 1

DAVIS-BESSE UNIT 1 B 3/4 0-lb Amendment No. 77,135 l

l l

- _______-___--_____l