ML20086U312

Proposed Tech Specs Clarifying LCO from Independent to Qualified Circuit

ML20086U312
Person / Time
Site:	Davis Besse
Issue date:	07/28/1995
From:	CENTERIOR ENERGY
To:
Shared Package
ML20086U304	List: ML20086U301 ML20086U305 ML20086U312
References
NUDOCS 9508040047
Download: ML20086U312 (8)

Text

. LAR 95-0004 Page 15 l

3/4. 8 ELECTRICAL POWER SYSTEMS ADDITIONAL CHANGES PREVIOUSLY 3/4.8.1 A.C. SOURCES ,s>-

PROPOSED BY LETTER '

Serial No. 2 z 9 z Date <.>c/offe-OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

a. Two ijdali;fisd 4ndependent circuits between the offsite transmission netwofidd^the onsite Class 1E AICiMlbbtfiddybW6d distribution system]. cach censisting of and

1. Onc OPER^.BLE 345 KV transmission line.

2. Dr.c OPER^BLE 345 13.8 KV startup transformer. and

3. One OPEP^BLE 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.

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

3. A separate fuel transfer pump.

APPLICABILITY: MODES 1. 2. 3 and 4.

ACTION:

a. With either an offsite circuit or diesel generator of the above required A.C. 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 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 two diesel generators to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 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 />.

b. With one offsite circuit and one diesel generator of the above required A.C. 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 />. Restore at least two DAVIS-BESSE. UNIT 1 3/4 8-1 Amendment No. 6.97 9508040047 950728 PDR P ADOCK 05000346 pop

s. x LAR 95-0004 " ADDiil0NAL CHANGES PREVIOUSLY

$ P:sa 16 ' PROPOSED BY LETTER-4LECTRICAL POWER SYSTEMS Serial No. 2 2.9 2- - Dateahdes ACTION'(Continued) offsite circuits and two diesel generators 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 the time of initial loss or be in at least P 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 />.

c. 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 />.

t I d. 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 haurs. Restore at -least two diesel generators 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 />.

SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Each of the above required hiIiT isd independent circuits between the offsite transmission network and the"~6h]f' s ifs Class 1E EC@6stj]?i]Md 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 offsite circuits 2dS KV tran=i= ion 'ines. **

4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE:

a. At least once per 31 days 3 on a STACCERED TEST BASIS. if Surveillance Requirement 4.8.1.1.2.c has not been performed within the previous 31 days, by:

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

1 lLAR'95-0004 R 7 L Prga J7.

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E . ELECTRICAL POWER SYSTEMS

> SURVEILLANCE REQUIREMENTS (Continued) i

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

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

i

3. Verifying the fuel. transfer pump can be started and . i transfers 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. i

5. Verifying the generator is synchronized, loaded to 21000 ,

kw. and operates for > 60 minutes. j

6. Verifying the diesel generator is aligned to provide standby l 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  ;

specified in Table 1 of ASTM D975-68 when checked for viscosity.

water and sediment. ,

c. At least once per 184 days on STACCERED TEST BASIS by: .

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

i

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

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

4. Verifying the diesel starts from ambient condition and -

accelerates to at least 900 rpm in 510 seconds.  ;

5. Verifying the generator is synchronized. loaded to 21000 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 i

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with each load sequence time within i 10% of its required 1 value. )

i DAVIS-BESSE. UNIT 1 3/4 8-3 Amendment No. 75.97.I05 l l

l l

,LAR 95-0004 P gs 18 ELEC RICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

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 j 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. ,

1

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.*

1 1

0 The provisions of Specification 4.0.2 are not applicable.

DAVIS-BESSE, UNIT 1 3/4 8-4 Amendment No. 97,M5.141 1

'LAR 95-0004

- Page 19 4'

ELECTRICAL POWER SYSTEMS SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERABLE: c i

a. One 50ilfflid circuit between the offsite transmission network and the oitsjte^CTass IE KCiglsefdds]Ipowij distribution systemWiij(

ese:1 sting of: ,

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1. Onc OPERABLE 315 KV transmiscion line.

2. Onc OPERABLE 315 KV 13.B KY startup transfor:cr. :nd  !

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3. Onc OPERABLE 13.8 KV bus. and  ;

b. One diesel generator with:

1. Day fuel tank containing a minimum volume of 4000 gallons of fuel.  :

2. A fuel storage system containing a minimum volume of 32.000  !

gallons of fuel, and 9

3. A fuel transfer pump.

APPLICABILITY: MODES 5 and 6. [

ACTION:  ;

With less than the above minimum required A.C. electrical power sources  !

OPERABLE. suspend all operations involving CORE ALTERATIONS or positive  :

reactivity changes until the minimum required A.C. electrical. power sources are restored to OPERABLE status. ,

SURVEILLANCE REQUIREMENTS 4.8.1.2 The above required A.C. electrical power sources shall be demonstrated OPERABLE by the performance of each of the Surveillance Requirements of 4.8.1.1.1 and 4.8.1.1.2 except for re  ;

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DAVIS-BESSE. UNIT 1 3/4 8-5 Amendment No. 75 I

LAR 95-0004 Page 20 3/4.8 ELECTRICAL POWER SYSTEMS BASES The OPERABILITY of the A.C. and D.C. power sources and associated distribution systems during operation ensures that sufficient power will be available to supply 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.

OdalifiedToffsite?to*bnsite circuitsiafeithoselthat?areTds5cribed?inithsiUSAR ^ ^ ^ ~ ^ ' " ~ ~ ~ '

and are;partjof[theili censingIbasisjforithelplanti ~

An10PERABLEMdal i fi sd ?6f fsi te^;t6 *6hsits Tci rdui tRonsistsiof?d11[bFeak'Efsi transformers; switchesp interrupting?devicesh cablinggand. controls? requifsd to transmit power from the offsite': transmission networkLtolthe;onsite5 Class l1E

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essential busesi '~'~~ ^~ ~

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An' OPERABLE (qualifiedjoffsitiltolonsite cirediticonsistsyofi 1;

2.' ;OneLOPERABLE1345{kFtrinsini5sionilins 10neLOPERABLEL345 + 13.8:kvistartupstrans

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One0PERABLEL13.8

. _0neyERABLE+t4(161kv)  ; 13j 8 ;1kv! bus busa. andi;._ti s!tr_a nsfo_rme r.

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Typi ca11y S ths^slectrical@oseEi rsiefilsXs60F6sJssi sctbE?sMtchssiiFelssisdtsd to the'two differentistartup transformers.J Howevera under,certainLconditions it is appropriate toiselect bothi; switches:toitheisame'startup The circuitlin which the:startup transformer doesinot?havesa>r; eservelsource transformer!

selector switch preiselectedito;1t must?stillimeet)theirequirementsioff havin its 345L kvLtransmissioniline/ startup"; transformer 2:13!81kv! bus? and; bus? tie"g

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transformerLOPERABLEL ~~~~

In"the case where"a713:8'kEbbsMsTp"6ssf d?fr6sVstsFEURtFahsfornisFFths reservejsource selector (switchishouldLbe:selectedito theioppositeistartup~

transformer.

In' MODESTI:4 EifJ ons bf ths~rbq'uiFedF1318kVM4.16kVibusLtieltfahifoFnisrsTis?

inoperable. then~one cualified offsite to;onsiteLcircuit!;istinoperablefand;ths requirement of LCO 3.E.1.1.a is"notjmet; eThe appropriate: corresponding ACTION i statement must be entered. SThe essential'4.16kv busestremainiOPERABLEtwhile ~ ' '

energized _with;one;13.Bkv_-14.1.6kyfbus tiejtransformerl inoperable} ~ '

The ACTION recuirements specified for the levels of degradation of the power sources provice restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources are consistent with the initial condition assumptions of the safety analyses and are based upon maintaining at least one of each of the onsite A.C. and D.C.

power sources and associated distribution systems OPERABLE during accident i conditions coincident with an assumed loss of offsite power and single failure I of the other onsite A.C. source.

DAVIS-BESSE. UNIT 1 B 3/4 8-1 Amendment No. 100.Z58

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The OPERABILITY of the minimum specified A.C. and D.C. power sources and {

associated distribution systems during shutdown and refueling ensures that 1) '

the facility can be maintained in the shutdown or refueling condition for .

extended time periods and 2) sufficient instrumentation and control capability  :

is available for monitoring and maintaining the facility status. l The Surveillance Requirements for demonstrating the OPERABILITY of the 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. 450-1980. "IEEE Recommended Practice for Maintenance. Testing, and Replacement of Large Lead i Storage Batteries for Generating Stations and Substations".

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float charge, connection t resistance values and the performance of battery service and discharge tests- )'

ensures the effectiveness of the charging system. the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity. j Table 4.8-1 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 cells float voltage and specific gravity, j greater than 2.13 volts and .015 below the manufacturer's full charge specific ' i 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 manufacturer's fuli 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 ca) ability of the battery. Exceptions to the specific gravity requirements are ta(en to allow for the normal deviations experienced after a battery discharge and subsequent recharge associated with a service or performance discharge test. The specific gravity deviations are recognized and discussed in IEEE 450-1980.

l DAVIS-BESSE. UNIT 1 B 3/4 8-la Amendment No. 100.158

t LAR 95-0004 Page,22 ADDITIONAL CHANGES PREVIOUSLY PROPOSED BY LETTER APPOCABILITY Serial No. E E 9 E DateoudC BASES 3.0.5 This specification delineates what additional conditions must be satisfied to permit operation to continue, consistent with tbc ACTION statements for power sources, when a normal or emergency po e source is not OPERABLE. It specifically prohibits operation when one divuon 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.

1 L The provisions of this specification permit the ACTION statements associated I 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 i inoperable solely because of the inoperability of its normal or emergency power source.

For e Aample. S]ecification 3.8.1.1 requires in part that two emergency diesel generators be OPERABLE. The ACTION statement provides for a 72-hour out-of-service time when one emergency diesel generator is not OPERABLE. 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 i dictate invoking the applicable ACTION statements for each of the applicable j Limiting Conditions for Operation. However, the provisions of Specification l 3.0.5 permit the time limits for continued operation to be consistent with the ACTION statement for the inoperable emergency diesel generator instead, provided the other specified conditions are satisfied. In this case, this would mean that the corresponding normal power source must be OPERABLE and 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 power source OPERABLE). If they are not satisfied, action is required in i accordance with this specification. I As a further example. Specification 3.8.1.1 requires in part that two ylialifibd netWo f sn"If the onsite Class IE distribution system be OPERABLE.hysica.ly The ACTION independent cir statement provides a 24-hour out-of-service time when both required 40511ffEd  !

effsite circuits are not GPERABLE. If the definition of OPERABLE wers~s@lisd I without consideration of Specification 3.0.5: all systems, subsystems, trains, i components and devices supplied by the inoperable normal power sources, both of the ijdhlifisd offsite circuits, would also be inoperable. This would dictate ^inV0Eihd the applicable ACTION statements for each of the applicable j LCOs. However, the provisions of Specification 3.0.5 permit the time limits I for continued operation to be consistent with the ACTION statement for the inoperable normal power sources instead, provided the ]i DAVIS-BESSE. UNIT 1 B 3/4 0-la Amendment No. 7Z Correction Letter S/9/S'

_ _ - _ _ _ _ _