Text

Proposed Tech Specs Re Electrical Power Sys - Diesel Generator
	ML20059P034
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/09/1990
From:	; ENTERGY OPERATIONS, INC.
To:	;
Shared Package
ML20059P032	List: 2CAN109006, Application for Amend to License NPF-6,revising Tech Spec Re Reduction of Rapid Loading to Which Diesel Generators Subj & Reduces Number of Tests Associated W/Actions for Inoperable Equipment,Per Generic Ltr 84-15; ML20059P034;
References
	NUDOCS 9010250018
	Download: ML20059P034 (9)
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y[. c n p. 0:r n. <a 3/4.8 FLFCTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES OPERATING LIMITING CONDITION FOR OPERATIONS 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE: a. Two physically independent circuits between the offsite transmission network and the onsite Class 1E distribution system and b. Two separate and independent diesel generators each with: 1. A day. fuel tank containing a minimum volume of 280 gallons of fuel (equivalent to 50% of indicated tank volume), 2. A separate fuel storage system containing a minimum volume of 22,500 gallons of fuel (equivalent to 100% of indicated tank level), and 3. A separate fuel transfer pump. APPLICABILITY: HODES 1, 2, 3 and 4. ACTION: a. With one offsite A.C. circuit of the.above required A.C. electrical power sources droperable, demonstrate the OPERABILITY of the remaining offsite A.C. circuit by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. If one offsite A.C. circuit is inoperable for other than planned maintenance or testing, perform Surveillance Requirement 4.8.1.1.2.a.4 on the diesel generators within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months (unless the diesel generators are alrondy operating or have been successfully tested within the past 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ). Restore the offsit.e A.C. circuit to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least 110T STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . b. With one diesel generator of the above required A.C. electrical power sources inoperable for other than planned maintenance or testing, demonstrate the OPERABILITY of both offsite A.C. circuits by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, and perform Surveillance Requirement 4.8.1.1.2.a.4 on the OPERABLE diesel generator within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months (unless the diesel generator is already operating or it has been successfully tested -within the past 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ). Restore the diesel generator to OPERABLE' status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at 1 cast HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . ARKANSAS - UNIT 2 3/4 8-1 l l I i j 1 ELECTRICAL POWER SYSTEMS' ACTION (Continued)- i i c. With one offsite A.C. circuit and one diesel generator of the i above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining offsite A.C. circuit by performing Surveillance Requirement 4.6.1.1.1.a within I hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, and perform Surveillance Requirement 4.8.1.1.2.a.4 on the remaining diesel generator within the next 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months (unless the diesel generator is already operating or has been successfully. tested within the past 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ). Restora at least one of the inoperable sources to OPERABLE status wi'hin 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at least HOT STANDBY within the next 6 haurs and in COLD SHUTDOWN within the following i 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore beth offsite circuits and both diesel generators to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months of the initiating event or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . d. With two offsite A.C. circuits of the above required'A.C. electrical power sources inoperable perform Surveillance Require-ment 4.8.1.1.2.a.4 on the diesel generators within the next 8 f hours.(unless the diesel generators are already operating or have been successfully tested within the past 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ). Restore one of the inoperable offsite A.C. circuits to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore both A.C. circuits within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months of the initiating event or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . With two diesel generators of the above required A.C. electrical e. power sources inoperable, demonstrate the OPERABILITY of the two offsite A.C. circuits by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. Restore one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . Restore both diesel generators within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months of the initiating event or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . P ARKANSAS - UNIT 2 3/4 8-2 i i I l-2 (- F.TICTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS f t-4.8.1.1.1 Each of the above required independent circuits between the E offsite transmission network and the onsite Class 1E distribution' system shall be: a.- Detarained' OPERABLE at;1 east once per 7 days by. verifying correct breaker alignments, Indicated power availability, and b.- Demonstrated OPERABLE at least once per 18 months during shutdown l by transferring (manually and automatically) unit power supply I from the normal circuit to the alternate circuit. 4.8.1.1.2 Each diesel generator shall be demonstrated OPERABhE (Note 1) l a. In accordance with the frequency specified in Table 4.8-1 on a STAGGERED. TEST BASIS by: 1. Verifying the fuel level in the day fuel tank, r .i I 2. Verifying the fuel level in the fuel storage tank. f. 3. Verifying the fuel transfer pump can be started and transfers fuel from the storage system to the day tank. 4. Verifying the diesel starts and accelerates to at'least 900 rpm in 5 15 seconds. 5. -Verifying the generator is synchronized, loaded to 2600 to 2850 Kw and operates for 2, 60 minutes. (Note 2) 6. Verifying the diesel gens;ator is aligned to provide standby . power to the associated emergency busses. b. At least once per 92 days by. verifying that a sample of diesel fuel from the fuel storage tank obtained in accordance with ASTM-D270-65, is within the acceptable limits specified in Table 1 of ASTM D975-74 when checked for viscosity, water and sediment. Note 1 'All planned diesel generator starts for the purposes of these surveillances may be proceded by prelube procedures. ~ Note 2 Diesel generator loading may be accomplished in accordance with vendor' recommendations. Momentary transients outside this + load band-due to changing loads will not invalidate the test. ARKANSAS - UNIT 2 3/4 8-2a a

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Ui ETICTRICAL POWER SYSTEMS SURVE1LLANCE REQUIREMENTS (Continued) g c. At 1 cast once per 18 months during shutdown by: 1. Subjecting the diesel to an inspection in accordance with procedures prepared in conjunction with its manufacturer's recommendations for this class of standby service. 2. Verifying that the automatic sequence time delay relays are OPERABLE at their setpoint i 10% of the elapsed time for each load block. 3. Verifying the generator capability to reject a load of 2596 kw and maintain voltage at 4160 1 500 volts and frequency at 60 i 3 liz. 4. Verifying the generator capability to reject a load of 2850 Kw without exceeding 75% of the difference between nominal speed and the overspeed trip setpoint, or 15% above nominal, whichever is lower. 5. Simulating a loss of of fsite power by itself, and: a) . Verifying de-energization of the emergency busses and load shedding from the emergency busses. b) Verifying the diesel starts from ambient condition on. the undervoltage auto-start signal, energizes the emergency busses with permanently connected loads, energizes the auto-connected shutdown loads through the time delay relays and operates for 1 5 minutes while its generator is loaded with the shutdown loads. 6. Verifying that on a Safety Injection Actuation Signal (SIAS) actuation test signal (without loss of offsite power) the diesel generator starts on the auto-start signal and operates on standby for 1 5 minutes. ARKANSAS - UNIT 2 3/4 8-3 Amendment No. 45 i a. q'.. .s 1

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=. L, + ELECTRICAL p0WER SYSTEMS i s ! SURVEILLANCE REQUIRMENTS (Continued) j 7. Verifying that all diesel generator trips, except engine l overspeed, lube oil pressure, and generator differential, + are automatically bypassed upon a Safety injection l' Actuation Signal. ' [ 8. Simulating a loss of offsite power'in conjunction with SIAS l and a) Verifying de-energization of the emergency-busses and F load shedding from the emergency bosses. b) Verifying the diesel starts from ambient condition on the auto-start signal, energizes the emergency busses with permanently connected loads, energizes the r auto-connected emergency (accident) loads through the [ Time Delay Relays and operates for 1 5 minutes while l ?! its generator is loaded with the emergency loads. 9. Verifying the diesel generator operates.for at Inast 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . During the first 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months of'this test, the j diesel generator shall be loaded to 2900 te 3135 Kw and l during the remaining 22 hours2.546296e-4 days 0.00611 hours 3.637566e-5 weeks 8.371e-6 months of this test, the diesel generator shall be loaded to 2600 to 2850 Kw. (Note 2) o a) Within 5 minutes after completing this 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months test or t within 5 minutes after operating the diesel generator { at 2600 to 2650 kw to stabilize internal operating temperatures, but not less than 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , verify the-diesel starts and accelerates to at least 900 rpm in.5 15 seconds. t 10. Verifying that the auto-connected loads to each diesel generator do not exceed the 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months rating of 3135 kw. 1 i l' [ ARKANSAS - UNIT 2 3/4 8-4 Amendment No. 56, 94 L p; j Lte = < l s p [!

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[ h: I ELECTRICAL POWER SYSTEMS SURVE11. LANCE REQUIREMENTS (Continued) 1 11. Verifying the diesel generator's capability to: j l a) Synchronize with the offsite power source while the generator is loaded with its emergency (accident) loads-l _] upon a sistlated restoration of offsite power. b) ~ Transfer its loads to the offsite power source, and [ c) proceed through its shutdown sequence. 12. Verifying that with the diesel generator operating in 7: a test mode (connected to its bus), a simulated safety injection signal overrides the test mode by (1) returning the diesel generator to standby operation and (2) auto-matica11y energizes the auto-connected emergency (accident) loads with offsite power. 13. Verifying that the fuel transfer pump transfers fuel from each fuel storage tank to the day tank of each diesel via the installed cross connection lines. d. At least once per 10 years or after any modifications which could affect diesel generator..;terdependence by starting both diesel generators simultaneously, during shutdown, and . verifying that both diesel generators accelerate to at 1 cast 900 rpm in i 15 seconds. 1i 4.8.1.1.3 Reports - See Specification 6.9.1.5.d. ARKANSAS - UNIT 2 3/4 8-4a Amendment No. 91 is i" D l

u. -

i : ] 1 1 E TARLE 4.8 1 l k DIESEL GENERATOR TEST SCHEDULE f Number of Failures In Number of Failures In

^

LLast'20 Valid Tests

Last 100 Valid Tests
Test Freauenev 5 1~

54 At least once per 31 days 22' 25 At least once per 7 days j

Criteria for determining number of failures and number of valid tests shall be in accordance with Generic Letter 84-15, where the last 20/100 tests are determined on a per diesel generator unit ~ basis. For the purposes of this test ~ schedule, only valid tests conducted af ter Operating License issuance date shall be included in the computation of1the "last 20/100 valid tests". Entry into this test schedule shall be made at the day test' frequency.

t L l p: [. ARKANSAS - UNIT 2 3/4 8-4b Amendment No. 90 ? e%-- i s l' yy o e L ;, 4.' t 3/4.8 M CTRICAL POWER SISTEMS k, ~ BASES t o Y e V~ The OPERABILITY of the A.C. and D.C. power sources and associatad p distribution systems during operation ensures that sufficient power will bc Java 11able to supply the safety-related equipment required for 1) the safe shutdown of the facility and 2) the mitigation and control of accident L conditions within the facility. The minimum specified independent and redundant A.C. and D.C. power sources and distribution systems satisfy'the p e L requirements of General Design Criteria 17 of Appendix "A" to 10 CFR 50. i 0 'I E The ACTION requirements specified for the icvels of degradation of the ! power sources provide restriction upon continued facility operation ' commensurate with the level of degradation. The OPERABILITY of the power i sources are consistent with the initial condition assumptions of the I i accident analyses and are based upon maintaining at least one redundant set of onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source. ACTION requirements are consistant with Generic Letter-84-15, " Proposed Staff Actions to improve and Haintain Diesel Generator Reliability." 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

7 condition for extended time periods and 2) sufficient instrumentation and I

control capability is available for monitoring and maintaining the unit status. The Surveillance Requirements for demonstrating the OPERAHILITY of' the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capar,ity for Standby Power Supplies", March =10, 1971, and 1.108 " Periodic Testing of Diesel Generator a Units Used as Onsite Electric Power Systems'at Nuclear Power Plants", Revision 1, August 1977 and Generic Letter 84-15. Load Ranges.provided in surveillances are meant as guidance to avoid routine overloading of diesel generators. Load in excess of these load ranges for special testing, momentary variation due to changing bus loads,'or short term variation's within the diesel generator ratinge shall not invalidate surveillance tests. The Diesel Generator Test Schedule, Table 4.8-1 has been developed for the purpose of determining testing requirements based on the number of failures and valid tests using the example provided in Generic Letter 84-15 using a per diesel generator unit basis. The criteria of R.G.1.108 position C.2.e is used for criteria determination. Containment electrical penetrations and penetration conductors are l' protected by either de-energizing circuits not required during reactor

operation or by demonstrating ~ the OPERABILITY of primary and backup overcurrent protection circuit breakers during periodic surveillance.

ARKANSAS - UNIT 2 B 3/4 8-1 L T

ML20059P034

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