ML20246Q325

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Proposed Changes to Tech Specs,Implementing Generic Ltr 84-15 Re Diesel Generator Recommendations & Removing Footnotes Which No Longer Apply
ML20246Q325
Person / Time
Site: LaSalle  Constellation icon.png
Issue date: 03/16/1989
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML20246Q315 List:
References
GL-84-15, NUDOCS 8903290015
Download: ML20246Q325 (15)
v • d • e


Text

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7 I [. 0 4

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. A*II&CIMEICLE

' PROPOSED CHANGES TO

-THE TECHNICAL SPECIFICATIONS FOR QPJJtATING LICZliSIS NPF-11 AND NPF-18 i

REVISED PAGES:

l-NPF-11 NPF-18 3/4 8-1 3/4 8-7 3/4 8-la 3/4 8-7a 3/4 8-2 B 3/4 8-1 3/4 8-7 Page insert.

3/4 8-7a

  • B 3/4 8-l' Page insert
  • Proposed new page.

5588k i8903290015'890316 , a ADOCK 05000373  !:

'.PDR p PDC ,,

m. . . . ,;..._,_.._. . ..e. .. ...

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y 3/4.8 ELECTRICAL POWER SYSTEMS l

3/4.8.1 A.C. SOURCES

!l A.C. SOURCES - OPERATING LIMITING CONDITION FOR OPERATION E

. 1 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

{

4

a. Two physically. independent circuits between the offsite transmission ?1 network and the onsite Class 1E distribution ystem, and O
b. Separate and independent diesel generator 0, 1A, 2A and IB with: b. f l
1. For diesel generator 0, 1A and 2A:

a) A separate day fuel tank containing a minimum of 250 gallons of fuel.

jj b) A separate fuel storage system containing a minimum of  ?

31,000 gallons of fuel. I,

2. For diesel generator 18, a separate fuel storage tank / day tank ]'

containing a minimum of 29,750 gallons of fuel.

3. A separate fuel transfer pump. .

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

OV ACTION: -

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a. With either one cffsite circuit or diesel generator 0 or 1A of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveil-lance Requirements 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 4.8.1.1;2a.4, for one diesel generator at a time, within eight hours, 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 two offsite circuits and diesel generators O and 1A 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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
b. With one offsite circuit and diesel generator 0 or 1A of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirements 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 4.8.1.1.2a.4, for one diesel generator at a time, within six hours, 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 A.C.

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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 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 diesel generators 0 and 1A 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 y the time of initial loss or be in at least HOT SHUTDOWN within the G next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. $

O {h V page 3/4 8-1 i

LASALLE-UNIT 1 3/4 8-1 Amendment No. 49

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ELECTRICAL' POWER SYSTEMS MDM L'IMITING CONDITION FOR OPERATION'(Continued) t i,

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. DELET6- AN i

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  • For the purpose of completing technical spec ication surveillance i requirements.4.8.1.1.2d.1 and 4.8.1.1.2f.1 as part~of-a pre planned- :j preventive maintenance program, on the O lesel generator the requirements of j action statement a are modified to: $
1. Eliminate the. requirement f r performing technical specification k i

surveillance requirements .8.1.1.la and:4.8.1.1.2a.4, on each 5 operable'AC source, imm iately and once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, i when the 0 diesel gen ator is. declared inoperable. 4

2. Allow an additiona 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> in excess of the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed in. i action statement- for the 0 diesel generator to be inoperable. J

)

Provided,that the f lowing conditions are met: '

A. Unit 2 is i operational ~ condition 4 or 5 or defueled prior to j taking the diesel generator out of service: <

k B. Surveil' nce requirements 4.8.1.1.la and 4.8.1.1.2a.4 are j succe fully completed, for the offsite power sources and the 1A and.

2A d sel generators, within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to removal ~of the 0  ;

die el generator from service.'

)

C. maintenance is performed on the offsite circuits or the 1A or 2A fesel generators, while the 0 diesel generator is inoperable.'.

D. Technical specification requirement 4.8.1.1.la is performed daily, while.the 0 diesel generator is inoperable.

E. The control circuit for the unit cross-tie circuit breakers between g buses.142Y and 242Y are temporarily modified to allow the breakers j to be closed with a diesel generator feeding the bus, while the 0  ;

diesel generator is inoperable.

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The provisions of technical specification 3.0.4 are not applicable. ,

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LASALLE-UNIT 1 3/4 8-la Amendment No. 63 pgga _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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ELECTRICAL POWER SYSTEMS '

V LIMITING CONDITION FOR OPERATION (Continued) .

ACTION (Continued) ,

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c. With both of the above required offsite circuits inoperable, demon-strate the OPERABILITY of the remaining A.C. sources by performing j Surveillance Requirement 4.8.1.1.2a.4, for one diesel generator at I a time, within eight hours, 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, , i unless the diesel generators are already operating; restore at least one of the inoperable offsite circuits 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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

With only one offsite circuit restored to OPERABLE status, 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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

d. With diesel generators 0 and 1A of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remain- ,

ing A.C. sources by performing Surveillance Requirements 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 4.8.1.1.2a.4, for one diesel generator at a j time, within four hours 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; .

j restore at least one of the inoperable diesel generators 0 and 1A 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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. -

(n)

V Restore both diesel generators 0 and 1A 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 SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. ,

e. With diesel generator 1B of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirements 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 4.8.1.1.2a.4, for one diesel generator at a time, within six hours, 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 the inoperable diesel generator 1B 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 declare the HPCS system inoperable and take the ACTION required by Specification 3.5.1.
f. With diesel generator 2A of the above required A.C. electrical power Q On , '

sources inoperable, demonstrate the OPERABILITY of the remaining /

A.C. sources by performing Surveillance Requirements 4.8.1.1.la Cand q 4.8.1.1.2.a4, for diesel generator IA, within c~ W, and at 1WO H043U 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 the inoperable diesel generator 2A 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 declare standby 9-gas treatment system subsystem B, Unit 2 drywell and suppression chamber hydrogen recombiner system, and control room and auxiliary electric equipment room emergency filtration system train B inoperable and take the ACTION required by Specifications 3.6.5.3, 3.6.6.1., p and 3.7.2; continued performance of Surveillance Requirements d 4.8.1.1.la, and 4.8.1.1.2a.4 for diesel generator 1A is not required r

[mV) provided the above systems are delcared inoperable and tie ACTION of their respective specifications is taken.

i LA SALLE - UNIT 1 3/4 8-2 Amendment No. 18

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'. ELECTRICAL ' OWE'R SYSTEMS 7.'.. P

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. SURVEILLANCE REQUIREMENTS (Continued)

e. At least once per.10 years'or after any modifications which could '

affect diesel generator interdependence by starting diesel :gener- g ators 0,1A and IB simultaneously, during shutdown, and verifying 3 that all three diesel generators accelerate to 900 rpm + 5, -2% in.  ;

less than or equal to 13 seconds. j

-f. At least once per 10 years by: h

1. Draining each fuel oil storage tank, removing the. accumulated f sediment and cleaning the. tank using a sodium hypochlorite or  ?

equivalent. solution', and

2. Performing a pressure test of those portions of the diesel fuel oil system designed to Section III, subsection ND, of the '

ASME Code in accordance with ASME Code Section 11,. Article IWD-5000.

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4.8.1.1.3 Reports - All diesel generator failures, valid or non-valid, shall -(

be reported to the Commission pursuant to Specification 6.6.C within 30 days. 'l I

Reports of diesel-generator failures shall. include the information recommended j in Regulatory Position C.3.b of Regulatory Guide 1.108, Revit '.on 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 t,r. supplemented to include the additional information recommended in Regulatory Position c.3.b of (v) - Regulatory Guide 1.108, Revision 1, August 1977. :i l

TABLE 4.8.1.1.2-1 p mst.M l DIESEL GENERATOR TEST SCHEDULE 9 4 I

i Number of Failures in f

.Last 100 Valid Tests

  • Test Frequency [

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~<1 At least once per 31 days J I

2 At least once per 14 days

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3 At least once per 7 days a

>4 At least once per 3 days f k

^ Criteria for determining number of failures and number of valid a tests shall be in accordance with Regulatory Position C.2.e of $

Regulatory Guide 1.108, Revision 1, August 1977, where the last I 100 tests are determined on a per nuclear unit basis. With the "

1 exception of the semi-annual fast start, no starting time re-quirements are required to meet the valid test requirements of

( Regulatory Guide 1.108. , ?E LA SALLE - UNIT 1 3/4 6-7 Amendment No. 23

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. 1 ELECTRICAL POWER SYSTEMS

, SURVEILLANCE REQUIREMENTS (Continued) l l

TABLE 4.8.1.1.2-1

. DIESEL GENERATOR TEST SCHEDULE NUMBER OF FAILURES IN NUMBER OF FAILURES IN LAST 20 VALID TESTS

  • LAST 100 VALID TESTS
  • TEST FREQUENCY j 1 l' 14 At least once per 31 days 1 2 ** 15 At least once per 7 days
  • Criteria for determining number of failures and' number of. valid tests shall'be.in accordance with Regulatory Position C;2.e of. Regulatory Guide 1.108, Revision 1, August 1977, but determined on a per diesel generator basis. With the exception of the semi-annual fast start, no starting time requirements are required to meet the valid test requirements of Regulatory Guide 1.108.

For the purposes of determining the required test frequency, the previous test failure count may be reduced to zero ift

1) a complete diesel overhaul to like-new condition is completed (provided that the overhaul, including appropriate post-maintenance operation and testing, is specifically approved by the manufacturer),

and

2) If acceptable reliability has been demonstrated. The reliability criterion shall include the successful completion of 14 consecutive tests in a single series structured as follows: ,

a) ten of these tests shall be performed in accordance with the routine Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5, and i b) four tests shall be performed in accordance with the 184-day testing requirement of Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5. If this criterion is not satisfied during the g

first series of tests, any alternate criterion to be used to reset the failure count to zero requires NRC approval.

    • The associated test frequency shall be maintained until 7 consecutive failure free demands have been performed AND the number of failures in the last 20 valid demands has been reduced to one.

LA SALLE - UNIT 1 3/4 8-7a PROPOSED AMENDMENT 5588k

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s 3/4.8 ELECTRICAL POWER SYSTEMS BASES l 3/4.8.1 and 3/4.8.2 A.C. SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS 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 Criteria 17 of Appendix "A" to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide 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 accident analyses and are based upon maintaining at least Division I or II of the <

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 one of the two onsite A.C. sources. Division III supplies the high pressure core spray (HPCS) system only. .

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 unit status.

The surveillance requirements for demonstrating the OPERABILITY of the

, diesel generators are in accordance with the recommendations of Regulatory

' Guide 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Sup-plies," March 10, 1971, with the exception noted in Appendix B to the FSAR, and l Regulatory Guide 1.108, " Periodic Testing of Diesel Generator Units Used as j Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977. i The diesel generator fast start surveillance requirements, ba~ sed on a PRA ,

study, are sufficient to demonstrate the onsite A.C. power system capability to mitigate the consequences of the design basis event for the plant, i.e., large j LOCA coincident with a loss-of-offsite power, while minimizing the mechanical stress and wear on the diesel engine. e The surveillance requirements for demonstrating the OPERABILITY of the \

unit batteries are in accordance with the recommendations of Regulatory Guide 1.129, " Maintenance Testing and Replacement of Large Lead Storage *NDEEI 86E i Batteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, NsT WE 4 "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Station and Substations." {,

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage onfloat charge, connection j resistance values and the performance of battery service and discharge tests o ensures the effectiveness of the charging system, the ability to handle high d ) discharge rates and compares the battery capacity at that time with the rated capacity. ,

LA SALLE - UNIT 1 B 3/4 8-1

, Amendment No. 16 1w

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4 INSERT FOR DIESEL GENERATOR TECHNICAL SPECIFICATION BASES The diesel generator test schedule (Table 4.8.1.1.2-1) has been o established tc maintain diesel generator reliability ebove 0.95 per. demand.

'Normally each diesel generator. unit'will be tested at least once per 31 days.

.Whenever a diesel generator has. experienced.two or more failures in the last

'20' demands, the maximum time.between tests will be reduced to 7. days. Two failures in.20 demands is'a failure rate of 0.1, or the threshold of acceptable diesel generator = performance,'and hence may be an early indication of' degradation of the reliability of a diesel generator. However, when considered in the light of a :long history of. tests, two failures in.the last 20 demands may.only be a. statistically probable distribution of two random events.. Increasing the test frequency will allow for a more timely

' accumulation of~ additional test data upon which to base judgement of the reliability.of.the diesel generator.

5588k l

rj ELECTRICAL POWER SYSTEMS N)

SURVEILLANCE REQUIREMENTS (Continued)

E

e. At least once per 10 years or after any modifications wh*' h could affect diesel generator' interdependence by starting diese gener-ators 0, 2A, and 28 simultaneously, during shutdown, and Derifying that all three diesel generators accelerate to 900 rpm + b, -2% in less than or equal to 13 seconds.

.f. At.least once per 10 years by:

'1. Draining each fuel oil storage tank, removing the accumulated sediment.and cleaning the tank using a sodium hypochlorite or-equivalent solution, and

2. Performing a pressure test of those portions of the diesel fuel oil system designed to Section III, subsection ND, of the ASME Code in accordance with ASME Code Section 11, Article 1 IWD-5000.

l

4. 8.1.1. 3 Reports - All diesel generator failures, valid or non-valid, shall "

be reported to the Comn Ission pursuant to Specification 6.6.C within 30 days.

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 n 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 I]

b of Regulatory Guide 1.108, Revision 1, August 1977.

TABLE 4.8.1.1.2-1 0 DIESEL GENERATOR TEST SCHEDULE

[ i s

1 Number of Failures in I Last 100 Valid Tests

  • Test Frecuency

. ~

<1 At least once per 31 days  ;

2 At least once per 14 days 3 At least once per 7 days

>4 At least once per 3' days

" Criteria for determining number of failures and number of valid i tests shall be in accordance with Regulatory Position C.2.e of  ?

Regulatory Guide 1.108, Revision 1, August 1977, where the last l 4*

100 tests are determined on a per nuclear unit basis. With the exception of the semiannual fast start, no starting time require-ments are required to meet the valid test requirements of f 4 f-Regulatory Guide 1.108.

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LA SALLE - UNIT 2 3/4 8-7 Amendment No.Il

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.,-[ELEC'TRICALPOWERSYSTEMS

~ SURVEILLANCE REQUIREMENTS (Continued)

L l TABLE 4.8.1.1.2_1 DIESEL GENERATOR TEST SCHEDULE NUMBER OF~ FAILURES IN NUMBER OF FAILURES.IN LAST 20 VALID TESTS *- LAST 100 VALID TESTS * -TEST FREQUENCY l'1 14 At least once.per 31 days 1 2 ** 15 At least once per l 7 days

  • Criteria for determining number of failures and number of valid tests shall be in accordance with Regulatory Position C.2.e of Regulatory Guide 1.108, Revision 1, August 1977, but determined on a per diesel generator basis. With the exception of the semi _ annual fast start, no starting time requirements'are required to meet the valid test requirements of.

Regulatory Guide 1.108.

For'the purposes of determining the required test frequency, the previous test failure countLmay be reduced to zero ift

1) a' complete diesel overhaul to like-new condition is completed (provided_that the overhaul, including appropriate post _ maintenance operation and testing, is specifically approved by the manufacturer),

and

2) if acceptable reliability has been demonstrated. The reliability criterion shall-include.the successful completion of 14 consecutive tests in a single series structured as follows:

a) ten of these tests shall be performed in accordance with the routine Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5, and b) four tests shall be performed in accordance with the 184-day testing requirement of Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5.

If this criterion is not satisfied during the first series of tests, any alternate' criterion to be used to reset the failure count to zero requires NRC approval.

    • ' The associated test frequency shall be maintained until 7 consecutive failure free demands have been performed AND the number of failures in the last 20 valid demands has been reduced to one.

LA SALLE - UNIT.2 3/4 8-7a PROPOSED AMENDMENT 5588k

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l 3/4.8 ELECTRICAL POWER SYSTEMS 1

\ im BASES l 3/4.8.1 and 3/4.8.2 A.C. SOURCES and ONSITE POWER DISTRIBUTION SYSTEMS  ;

The OPERABILITY of the A.C. and D.C. power sources and associated distri-bution systems during operation ensures that sufficient power will be available 'l to supply the safety-related equipment required for (1) the safe shutdown of i' 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 il Design Criterion 17 of Appendix A to 10 CFR Part 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources are consis-tent with the initial condition assumptions of the accident analyses and are l:

based upon maintaining at least Division I or II of the 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 one of the two onsite A.C. sources. Division III supplies the high pressure core spray (HPCS) system only. i 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 unit status. ,

The surveillance requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guide 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10, 1971, with the exception noted in Appendix B to the FSAR, and Regulatory Guide 1.108, " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977.

The diesel generator fast start surveillance requirements, based on a PRA study, are sufficient to demonstrate the onsite A.C. power system capability to mitigate the consequences of the design basis event for the plant, i.e., large LOCA coincident with a loss-of-offsite power, while minimizing the mechanical stress and wear on the diesel engine. t ntsEET The surveillance requirements for demonstrating the OPERABILITY of the W N unit batteries are in accordance with the recommendations of Regulatory PAGE Guide 1.129, " Maintenance Testing and Replacement of Large Lead Storage i Batteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, p "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Station and Substations." y e

Verifying average electrolyte temperature above the minimum for which the. t battery was sized, total battery terminal voltage onfloat charge, connection y resistance values and the performance of battery service and discharge tests

- ensures the effectiveness of the charging system, the ability to handle high $g; (b discharge rates and compares the battery capacity at that time with the rated capacity. l:j

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INSERT FOR DIESEL GENERATOR-IEffg(ICAL SPECIFICATION BASES The diesel generator test schedule.(Table 4.8.1.1.2-1) has been established; to maintain diesel' generator reliability above -0.95 'per demand.

Normally each diesel generator unit will be tested at least once per 31 days.

Whenever a diesel generator has experienced two or more failures in the last

~ 20. demands,-the maximum time between tests will be' reduced to 7. days. .Two-

- failures:in,20~ demands is a failure. rate of 0.1, or the threshold of acceptable' diesel generator performance, and'hence may.be an early indication

. of degradation of the reliability.of a diosel. generator. However, when-

- considered!in'the light'of a'long' history of tests, two failures in the last 20 demands.may only be a statistically probable distribution of two random events. jIncreasing the test frequency will allow for a more timely

' accumulation of additional' test data upon which to base judgement of the reliability-of the diesel generator.

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ATTACBIENT C.1 IECHNICAL SPECIFICATION CHANGE REOUEST 4,ASALLE COUNTY STATION UNJTS 1 AND 2 EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATION Commonwealth Edison has' evaluated the proposed Technical Specification knendment and determined that it does not represent a significant hazards consideration. Based on the criteria for defining a significant hazards

, consideration established in 10 CFR 50.92, operation of LaSalle' County Station Units 1 and 2 in accordance with the proposed snen&nent will not

1) Involve.. significant increase in the probability or consequences of an accident Eveviously evaluated because The diese) generator test schedule is an administrative process for establishing the reliability of'the diesel generators. The new test

. schedule,.as proposed in the amendment request, will help to establish the reliability of the diesel generators, to an acceptable level, while-reducing.the degradation of the diesel generators caused by excessive testing. . Since the reliability of the diesel generators is not degraded, and may actually te. improved by the proposed change, the probability or consequences of'an.secident previously evaluated will'not be increased.

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

The proposed-test schedule does not degrade the reliability of the diesel generators, therefore, the possibility of a new or different kind of accident is not created.

3) Involve a significant reduction in the margin of safety b3cause:

The proposed test schedule does not degrade the reliability of the diesel generators, therefore, the proposed amendment does not involve a significant reduction in the margin of safety. Since the proposed snendment will reduce the degradation of the diesel generators caused by excessive testing, the margin of safety may actually be improved.

Guidance has been provided in 51 CFR 7744 (reference a), for the application of standards to license change requests for determination of the existence of significant hazards considerations. This document provides examples of mnen&nents which are and are not considered to involve significant hazards considerations.

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This proposed amendment does not involve a significant relaxation of the criteria used to establish safety limits, a significant relaxation of the bases for the limiting safety system settings.or a significant relaxation of the basen for the limiting conditions for operations. Therefore, based on the guidance provided in the Federal Register and the criteria established in 10 CFR 50.92(e),~ the proposed change does not constitute a significant hazards consideration.

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l ATTACHMENT C.2 EVALUATION OF SIGNIFICANT HAZARDS CONSIDERATION Commonwealth Edison has evaluated the proposed Technical Specification Amendment and determined that it does not represent a significant hazards consideration. Based on the criteria for defining a significant hazards consideration established in 10 CFR 50.92, operation of LaSalle County Station Units 1 and 2 in accordance with the proposed amendment will not

1) Involve a significant increase in the probability or consequences of an accident previously evaluated because The administrative changes contained in the amendment request merely remove unnecessary footnotes and make a correction to the Unit 1 technical specifications to bring the Unit 1 technical specifications into conformance with the Unit 2 technical specifications.
2) Create the possibility of a new or different kind of accident from any accident previously evaluated because:

This is an administrative change. No changes are made to the facility or the operation of the facility which could create the possibility of a new or different kind of accident.

3) Involve a significant reduction in the margin of safety because No changes are made to the facility or the operation of the facility which could bring about a reduction in the margin of safety.

Guidance has been provided in 51 CFR 7744 (reference a), for the application of standards to license change requests for determination of the existence of significant hazards considerations. This document provides examples of amendments which are and are not likely considered to involve significant hazards considerations.

This proposed amendment does not involve a sigulficant relaxation of the criteria used to establish safety limits, a significant relaxation of the bases for the limiting safety system settings or a significant relaxation of the bases for the limit'ing conditions for operations. Therefore, based on the i guidance provided in the Federal Register and the criteria estab11shed in 10 CFR 50.92(e), the proposed change does not constitute a significant hazards j consideration, j

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