ML20236J080

Proposed Tech Specs,Clarifing How Gradual Loading of Diesel Engine Applied to Minimize Mechanical Stress & Wear on Diesel Generator

ML20236J080
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	07/28/1987
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20236J069	List: ML20236J066 ML20236J080
References
NUDOCS 8708060037
Download: ML20236J080 (10)

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ATTACHMENT A I

PROPOSED CHANGES TO APPENDIX A, I

TECHNICAL SPECIFICATIONS OF FACILITY l l

CPERATING LICENSES NPF-37, NPF-66, and NPF-72 I A

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Revised Pages: 3/4 8-2 (Byron Station, only) 3/4 8-3 3/4 6-7 (Byron Station, only) {

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3401K 0708060037 070728 PDR ADDCK 05000454 PDR p

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. ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION l

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ACTION (Continued)

c. With one diesel generator inoperable in addition to ACTION a. or b. ,

above, verify that:

1. All required systems, subsystems, trains, components and devices l that depend on the remaining OPERABLE diesel generator as a i source of emergency power are also OPERABLE, and ,

2. When in MODE 1, 2, or 3, the diesel-driven auxiliary feedwater l pump is OPERABLE and the other Unit's A Diesel Generator.is OPERABLE,* if the inoperable diesel generator is the emergency l power supply for the motor-driven auxiliary feedwater pump.

If these conditions are not satisfied within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> be in at least l 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 />. 1

d. With two of the above required offsite A.C. circuits inoperable, demonstrate the OPERABILITY of two diesel generators by performing Specification 4.8.1.1.2a.4) within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, unless the diesel gener-ators 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 i 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 />.

e. With two of the above required diesel generators inoperable, demonstrate the OPERABILITY of two offsite A.C. circuits by perform- )

ing Specification 4.8.1.1.la. within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 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; 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 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 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 />.

. vears after issuance of an operating license for Unit 1 the Un' ,

diesel gen

• ust be capable of providing power to bus , the LC0, ACTION and SURVEILL - 'irements of Spacif' 4.8.1.3 shall be l applicable. Subsequently, LCO . .-. , 2), and 3), and Surveillance Requirements 4.8.1.1.2 e - e applicab e +

Unit 2, A diesel as applicable for demonst +' 3 at the Unit 2, A diesel is OPE an emergency power e or the Unit 1 motor-driven auxiliary feedwater pump.

l BYRON - UNITS 1 & 2 3/4 8-2 l

4 ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Each of the above required independent circuits between the offsite j transmission network and the Onsite Class 1E Distribution System shall be: I

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

b. Demonstrated OPERABLE at least once per 18 months during shutdown by transferring manually unit power supply from the normal circuit to the alternate circuit.

4.8.1.1.2 Each dies ~el generator shall be demonstrated OPERABLE:

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 tank,

2) Verifying the fuel level in the fuel storage tank, )

3) Verifying the fuel transfer pump starts and transfers fuel from the storage system to the day tank,

4) Verifying the diesel starts from ambient condition and accelerates to at least 600 rpm in less than or equal to 10 seconds.* The generator voltage and frequency shall be 4160 1 420 volts and  ;

60 1 1.2 Hz within 10 seconds

• after the start signal. The i

, diesel generator shall be started for this test by using one of j the following signals:

a) Manual, or b) Simulated loss of ESF bus voltage by itself, or ,

c) Simulated loss of ESF bus voltage in conjunction with'an ESF actuation test signal, or d) A1 ESF actuation test signal by O t h e.n

5) Verifying the generator is synchron zed,Aloade to greater than  !

or equal to 5500 kW in less than or 0 seco'nds", operates I with a load greater than or equal to 5500 kW for at least 60 minutes, and

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

b. At least once per 31 days and after each operation of the diesel where the period of operation was greater than or equal to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> by checking for and removing accumulated water from the day tanks;  !

See. h sert "A", Next P ne. l

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-1 enerator start (10 sec) from ambient conditions shall # l at least once per e '

in these surveillance t o her engine starts  !

(# for the purpose of this survel lube period and/or +

may be mup procedures rec m... .

preceded by an engine pre-the manufacturer so th ~

a stress and wear on the diesel engine is min 1m .

l BYRON - UNITS 1 & 2 3/4 8-3 i

INSERT "A" I

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• This time limit need only be verified to be met at least once per 184 days in these surveillance tests. All surveillance tests may be preceded by warmup procedures and, with the exception of once per 184 days, may also include gradual loading (s 60 seconds) as recommended by the I manufacturer so the mechanical stress and wear on the diesel generator is minimized.

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ELECTRTCAL'POMER. SYSTEMS 4

SURVEILLANCE REQUIREMENTS (Continued)

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13) Verifying that the following diesel generator lockout features j prevent diesel generator starting only when required:

a) Turning gear' engaged, and b) Emergency stop.

g. At least once per 10 years or after any modifications which could affect diesel generator interdependence by starting both diesel generators simultaneously, during shutdown, and verifying that both diesel generators accelerate to at least 600 rpm in less than or equal to 10 seconds;

h. At least once per 10 years by:

1) Draining each fuel oil storage tank, removirig the accumulated a sediment aad cleaning the tank using a sodium hypochlorite solution, and

2) Performi,g a pressure test of those portions of the diesel fuel oil syst.am designed to Section III, subsection ND of the ASME Code at a test pressure equal to 110 percent of the system design pressure.

i. [A least once per 31 days by:

) Verifying the capability of crosstieing the Unit 2, A diesel  !

generator to Bus 141 by independently performing the following:

a) Synchronizing the Unit 2, A diesel generator to' Bus 241.

b) Closing breaker 1414, and.

c) Closing breaker 2414. 1

1. 1. 2) Verifying the capability of crosstieing the ",it.1 A diesel generator to Bus 241 by independently performing the ilowing:

l a) Synchronizing the Unit 1, A diesel generator to Bus 141, '

b) Closing breaker 1414, and Closing breaker 2414.

c)

j. [tleastonceper18monthsby: .

1. 1)' Crosstieing the 2A diesel generator to Bus 141.

1. 1. 2) Crosstieing the 1A diesel generator to Bus 241.

4.8.1.1.3 Reoorts - All diesel generator failures, _ valid or non-valid, shall be reported to the Commission pursuant to Specification 6.9.2. Reports of diesel generator failures shall include the information recommended in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977. If the number of failures in the last 100 valid tests (on a per nuclear unit basis) is greater than or equal to 7, the report shall be supplemented to include the additional information recommended in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1, August 1977.

N r curvei'Mnce e-ly applies to u00E5 1, 2, and 3 end is act applicable "at" 2 yes : after 15:"aate of Sr Operati"; 'icer.: for Urit 1

1. 0nly required for Unit 1 operation in MODES 1, 2, or 3.

1. 1. 0nly required for Unit 2 operation in MODES 1, 2,.or 3.

BYRON - UNITS 1 & 2 3/4 8-7

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, ELECTRICAL POWER SYSTEMS l

SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Each of the above required independent circuits between the 6ffsite ,

transmission network and the Onsite Class 1E Distribution System shall be: 1

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

b. Demonstrated OPERABLE at least once per 18 months during shutdown by l transferring manually unit power supply from the normal circuit to  !

the alternate circuit.

4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE:

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 tank,

2) Verifying the fuel level in the fuel storage tank,

3) Verifying the fuel transfer pump starts .and transfers. fuel from the storage system to the day tank,

4) Verifying the diesel starts from ambient condition and accelerates to at least 600 rpm in less than or equal to 10 seconds.* The I generator voltage and frequency shall be 4160 2 420 volts and 60 + 1.2 Hz within 10 seconds

• after the start signal. The diesel generator shall be started for this test by using one of the following signals:

a) Manual, or b) Simulated loss of ESF bus voltage by itself, or c) Simulated loss of ESF bus voltage in conjunction with an ESF actuation test signal, or d) An ESF actuation test signal by ,e n. i  !

th c. n

5) Verifying the generator is synchroni d,Aloa d to greater than .

or equal to 5500 kW in less than or eq o 60 seconds *, operates with a load greater than or equal to 5500 kW for at least 60 minutes, and

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

b. At least once per 31 days and after each operation of the diesel where the period of operation was greater than or equal to I hour by checking for and removing accumulated water from the day tanks; g S ee. LSe e+ "A " , A) e_v t Pase_ "

nerator start (10 sec) from ambient conditions shall b at least once per n these surveillance o er engine starts for the purpose of this survei may be preceded oy an engine pre-lube period warmup procedures recomm he manufacturer so c anical stress and wear on the diesel engine is minimize a j BRAIDWOOD - UNITS 1 & 2 3/4 8-3

INSERT "A"

• This time limit need only be verified to be met at least once per 184 days in these surveillance tests. All surveillance tests may be preceded by warmup procedures and, with the exception of once per 184 days, may also include gradual loading (s 60 seconds) as recommended by the i manufacturer so the mechanical stress and wear on the diesel generator is minimized.

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I ATTACHMENT B

SUMMARY

OF PROPOSED CHANGES One proposed change involves the removal of some interim notes for the Byron Station Technical Specifications 3.8.1.1 and 4.8.1.1.2, that had been needed only until two years after issuance of an operating license for Byron Unit 1. These can now be deleted for Byron Station.

The other proposed change involves a clarification to a note applicable to Technical Specification 4.8.1.1.2 regarding diesel engine starts. The proposed change clarifies that all surveillance tests, with the expection of the one performed once per 184 days, may be preceded by warmup procedures and may also include gradual loading as recommended by the manufacturer.

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." ATTACHMENT C EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATIONS Commonwealth Edison has evaluated this proposed amendment and determined that it involves no significant hazards considerations.

According to 10 CFR 50.92(c), a proposed amendment to an operating license involves no significant hazards considerations if operation of the facility in accordance with the proposed amendment would not:

1) Involve a significant increase in the probability or consequences of an accident previously evaluated; or

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

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

The proposed amendment provides a clarification to a note in Technical Specification 4.8.1.1.2 regarding diesel engine starts. For the Byron and Braidwood Stations the proposed revision clarifies that all surveillance tests, with the exception of the one performed once per 184 days, may be preceded by warmup procedures and may also include gradual loading as recommended by the manufacturer. The proposed amendment also provides for the removal of some interim Technical Specification notes that were needed only until two years after issuance of the operating license for Byron Station Unit 1.

The proposed amendment does not increase the probability or consequences of an accident previously evaluated. The proposed amendment is administrative in nature. Clarifying the note regarding diesel engine starts does not alter the type or intent of surveillance being performed to demonstrate diesel generator operability. The intent of Surveillance Requirement 4.8.1.1.2.a.5 is to load the diesel generator gradually for the monthly starts and only verify the diesel generator is loaded to 5500kw in less than or equal to 60 seconds for the 184 day starts. This note had been previously added to provide flexibility in the routine diesel generator start requirements so that mechanical stress and wear on the diesel generator could be minimized. This method or approach should result in enhanced reliability when the diesel generators are actually needed to respond to an accident. Also the deleting of Technical Specification notes that are no longer necessary for Byron Station does not impact any accident analysis results.

The proposed amendment does not create the possibility of a new or different kind of accident froin any previously evaluated because the revisions do not alter the surveillance or operability requirements for the diesel generators currently in the Technical Specifications. The changes are of an administrative type and do not affect any accident analysis.

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The note regarding diesel generator start requirements was I previously added based on guidance from Generic Letter 84-15. The purpose of this note was to enhance the reliability of the diesel generators by not performing testing which would unnecessarily degrade the performance of the  !

diesel generators. Therefore clarifying the wording of this note and I removing notes that are no longer applicable, will not affect the margin of j safety. l l

Therefore based upon the previous analysis, Commonwealth Edison concludes the proposed amendment to the Technical Specifications does not involve significant hazards considerations. l l

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