ML20134N480

Proposed Tech Spec Changes,Allowing Installation of Diesel Generator Lube Oil Mods by Extending Present 3-day or 7-day Period to 30 Days.Significant Hazards Determination Encl

ML20134N480
Person / Time
Site:	LaSalle
Issue date:	08/28/1985
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20134N471	List: ML20134N467 ML20134N480
References
0571K, 571K, NUDOCS 8509050161
Download: ML20134N480 (4)

Text

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ATTACtNENT B

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PROPOSED CHANGE TO - APPENDIX - A

! TECHNICAL-SPECIFICATION TO OPERATING LICENSES tPF-18 l Revised Pages:

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3/4.8 ELECTRICAL PC'.iER SYSTEMS 3/4. S .1 A.C. SOURCES A.C. SCURCES - OPERATING LIMITING CCNDITION FOR OPERATION

3. 8.1.1 As a minimum, the following A.C. electrical power sources shall be CPERABLE:

a. Two physically independent circuits between the offsite transmission network and the onsite Class 1E distribution system, and

b. Separate and independent diesel generatorE'0, lA, 2A and 23 with:

1. For diesel generator 0, IA and 2A:

a) A separate day fuel tank containing a minimum of 250 gallons of fuel, b) A separate fuel storage system containing a minimum of 31,000 gallons of fuel.

2. For diesel generator 23, ,a separate fuel storage tank / day tank containing a minimum of 29,750 gallons of fuel.

3. A separate fuel transfer pump.

APPLICASILITY: CPERATICNAL CCNDITICNS 1, 2, and 3.

ACTION:

a. With either one offsite circuit or diesel generator 0 or ZA of the atove recuired A.C. electrical power sources inoperable, demonstrate tne OPERASILITY 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 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; restore at least two offsite circuits and ciesel generators 0 and 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 be in at least HOT SHUTDCWN 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 SHUTCChN 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 2A of the above recuired 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 I hour, and 4.8.1.1.2a.4. , for one diesel generator at a time, within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-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; 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 SHUTD0kW 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 2A to OPERAELE 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 HOT SHUTCOWN 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 />.

LA SALLE - UNIT 2 3/4 8-1

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• For a 30 day period for each diesel generator 0 and 1A during the Unit 1 first refueling outage, with Unit 1 in operational condition 4 or 5 or defueleo, only 3 diesel generators, 28 and 2A, and either 0 or lA are required to satisfy the standby AC onsite power requirements for Unit 2.

Surveillance requirements,4.8.1.1.la and 4.8.1.1.2a.4 shall be performed 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 or lA diesel generator from service. During each 30 day period the remaining 3 diesel generators will be verifiedl operable at least once per day (in addition to any testing required by Table 4.8.1.1.2-1). The control circuit for the unit cross-tie circuit breakers between buses 142Y and 242Y shall be temporarily modified to allow the breakers to be closed with the diesel generator feeding the bus. In the event these conditions are not met, Unit 2 will be brought to HOT SHUTDOWN within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and 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 />.

The provisions of Technical Specification 3.0.4 do not apply.

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1 The term verify as used in this context means to administratively check by examining logs or other information to determine if certain components are out-of-service for maintenance or other reasons. It does not mean to perform the surveillance requirements needed to demonstrate the OPERABILITY l of the components.

l LASALLE - UNIT 2 3/4 8-la 0571K 1

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ATTACHMENT-C Significant Hazards Consideration A

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 Unit 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 in _the event of a loss of offsite power with the "0" or "1A" diesel inoperable for this period sufficient onsite power with a single active failure will i still be available to safely shutdown.

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2) Create the possibility of a new or different kind of accident from any accident previously evaluated because emergency power is still 4

available to those systems required to mitigate accidents evaluated in the FSAR.

3) Involve a significant reduction in the margin of safety because the probability of a loss of offsite power in addition to a remaining diesel generator failure during the period of these diesel generator modifications is sufficiently small to reasonably assure the health and safety of the public.

l Based on the preceding discussion, it is concluded that the proposed system change clearly falls within all acceptable criteria with respect to the system or component, the consequences of previously evaluated accidents will not be increased. and the margin of safety will not be decreased. Therefore, based on the guidance provided in the Federal Register and the criteria established in 10CFR50.92(e), the proposed change does not constitute a significant hazards consideration.

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