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Proposed Tech Specs,Permitting Installation of Diesel Generator Lube Oil Mod by Allowing Only Three Generators to Satisfy Standby Ac Onsite Power Requirements for 30 Days
	ML20134N445
Person / Time
Site:	LaSalle
Issue date:	08/23/1985
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML20134N444	List: ML20134N441; ML20134N445;
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	0528K, 528K, NUDOCS 8509050143
	Download: ML20134N445 (11)
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i ATTACINENT B PROPOSED CHANGE TO APPENDIX A 4-TECHNICAL-SPECIFICATION TO OPERATING LICENSES WF-11 and IPF-18 Revised Pages:

NPF-11 WF-18 3/4 8-1 3/4 8-1 3/4 8-la 3/4 8-la i

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3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C.SOURbES A.c. SOURCES - OPERATING I

LIMITING CONDITION FOR OPERATION \

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. Separateandindependentdieselgeneratorf0,IA,2Aand18with: l

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 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.

ACTION:

a. With either one offsite circuit or diesel generator 0 or IA of the above required A.C. electrical power sources inoperable, demonstrate the OPERASILITY of the remaining A.C. sources by performing Surveil-lance Requirements 4.8.1.1.la within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and 4.8.1.1.2a.4, i 18 for one diesel generator at a time, within eight hours, and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least two offsite circuits and diesel generators 0 and IA 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 HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b. With one offsite circuit and diesel generator 0 or IA of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveisiance Requirements 4.8.1.1.la within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and 4.8.1.1.2a.4, for one lag diesel generator at a time, within six hours, and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least one of the inoperable A.C.

sources to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Restore at least two offsite circuits and diesel generators 0 and IA to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from

! the time of initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

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

For a 30 day period for diesel generator 2A during the Unit 2 first refueling outage, with Unit 2 in-operational condition 4 or 5 or

. defueled, only 3 diesel generators 0, lA, and 18 are required to satisfy the

. standby AC onsite power requirements for Unit 1. Surveillance requirements 4.8.1.1.la and 4.8.1.1.2a.4 shall be performed within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to

removal of the 2A diesel generator from service, the remaining 3 diesel generators will be verifiedpring the 30 operable at day leastperiod once.

per day (in addition to any testing required by Table 4.8.1.1.2-1). In the event these conditions are not met, Unit I will be brought to HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and COLD. SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . The provisions of Technical Specifications 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 of the components.

LASALLE - UNIT 1 3/4 8-la 0528K

3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES A.C. SOURCES - OPERATING LINITING CONDITION FOR OPERATION 3.8.1.1 As a minista, the following A.C. electrical power sources sna11 be OPERABLE:

a. Two physically independent circuits between the offsite transmission ,

network and the onsite Class 1E distribution system, and l

b. Separate and independent diesel generators 0, IA, 2A and 28 with: l

1. For diesel generator 0, IA and 2A: l a) A separate day fuel tank containing a minimum of i 250 gallons of fuel. '

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

2. For diesel generator 28,.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.

ACTION:

a. With either one offsite circuit or diesel generator 0 or 2A 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 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and 4.8.1.1.2a.4.,

for one diesel generator at a time, within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least two offsite circuits and diesel generators 0 and 2A to OPERA 8LE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b. With one offsite circuit and diesel generator 0 or 2A of the above required A.C. electrical power sources inoperable, demonstrate the OPERA 8ILITY of the remaining A.C. sources by performing Surveillance l Requirements 4.8.1.1.la. within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and 4.8.1.1.2a.4., for one l diesel generator at a time, within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore at least one of the inoperable A.C.

sources to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Restore at least two offsite circuits and diesel generators 0 and 2A to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from the time of initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

LA SALLE - UNIT 2 3/4 8-1 u

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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 defueled, only 3 diesel generators, 2B 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 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months prior to removal of the 0 or 1A 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 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

The provisions of Technical Specification 3.0.4 do not apply.

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1 1 The term verify as ysed in this context means to administratively check by examining logs or oder 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 of the components.

l LASALLE - UNIT 2 3/4 8-la l

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ATTACHMENT C-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 i

1 County Station Units 1 and 2 in accordance with the proposed amendment will not:-

1) Involve a significant in:rease in the probability or consequences of an accident previously evaluated because in the event of a loss of offsite power with the "0" or "A" diesel inoperable for this period sufficient onsite power with a single active failure will still be available to safely shutdown.

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

1 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 i 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.

.t.

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ATTACHMENT D Station Blackout Assessment

-I. Probability of Losing -Off-Site-Power during a 30 day Period A. Both SAT's-energized, UAT de-energized Unreliabilityl Probability 2 i

1. Isolation Events

a. Grid Collapse lx10-8 8.22x10-10

b. Tornado thry switchyard 1.6x103 1.32x10-4

c. All 345kV lines out 2.5x107 2.05x10-8 Subtotal 1.32x10-4

2. Events which disable both SAT inputs

a. Line fault & breaker (' x10-3)2 1.69x10-7 failure

3. Events which fault both SAT outputs

a. 345kV bus fault & prot. (0.324)2 7.09x10-4 system malfunction

b. SAT fault (0.127)2 1.09x10-4 Subtotal U.16x10-*

Total 9.5x10-4 B. Both-SAT's and UAT-energized Failure Event Unreliabilityl Probability 2

1. Isolation events (Same as I.A.1) 1.32x10-4

2. All aux. transformer inputs disabled

a. Line fault & breaker -(5x10-3)3 6.95x10-Il failure

3. All aux. transformer outputs disabled

a. 345kV bus fault & prot. (0.324)3 1.89x10-5 system malfunction

b. Transformer faults 3 2x(0.127)3 2.28x10-6 Subtotal 2.12x10-3 Total 1.53x10-4 D-1

Notes: (1) Unreliability = prob. Of failure event / year (from ref. 3)

For multiple independent failure events such as transformer faults:

Unreliability = (prob. of failure event 1/ year) x (prob of failure event 2/ year) x (prob. of failure event n/ year)

(2) Probability = probability of failure event /30 days

= unreliability x 30/365 For multiple independent events:

Probability = (unreliability of event 1 x30/365) x (unreliability of event 2 x30/365) x (unreliability of event n x30/365)

(3) The probability that all three aux. transformers fail during the same 30 day period is:

unreliability of SAT 142 x 30/365+

unreliability of SAT 242 x 30/365+

(unreliability of UAT + power transformer) x 30/365 assuming all 4 transformers have the same unreliability, the probability is (0.127x30/365) x (0.127x30/365) x (0.127+0.127) x 30/365 =

, (0.127)2 x (2x0.127) x (30/365)3 =

2x(0.127)3 x (30/365)3 =

2.28x10-6 I

II. Probability of a Diesel Generator Failure Assumptions: DG-0 Inoperable Unit 1 in cold shutdown A. One or Both of the Remaining ' standby Diesels (lA and 2A) Fall on Demand 1 Failure Event Probability

1. Random Failures 2 3 a. DG-1A fails 0.01

b. 'DG-2A fails 0.01

c. Both 1A and 2A fail 0.0001 i

2. Common Mode Failures 3

a. DG-1A & 2A 0.002

b. DG-1A & 2B 0.002

c. DG-2A & 2B 0.002 Total 0.0261 D-2

s j l j B. Both DG's lA and 2A Fail on Demand Failure-Event Probability i Random failures 2 0.0001 l Common Mode Failures 3 0.002 Total 0.0021

- Notes: (1) The calculations will yield the same valve no matter which of

the three standby diesels is initially assumed to be inoperable.

(2) The probability for a random failure is based on operational experience (references (d), (e), and (f)).

., (3) The value for the common mode failure is from reference (b).

III. Probability of a LOSP and Diesel Failure A. LOSP and One or Both Olesels Fails

] 1. UAT De-energized Prob. = 9.5x10-4x2.16x10-2'= 2.48x10-5

2. UAT Energized Prob. = 1.53 x10-4x2.61x10-2 = 3.99x10-6 l

B. LOSP and Both Diesels Fail i 1. UAT De-energized

! Prob. = 9.5x10-4x2.1x10-3 = 2.0x10-6 I

2. UAT Energized

Prob. = 1.53x10-4x2.1x10-3 = 3.21x10-7 I

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I ATTACfNENT E Loss of Off-Site Power Transient Analysis

A. Unit 1 initially at full power, Unit 2 in cold shutdown, and DG-2A inoperable.

1. DG-0 fails:

i Inoperable Systems Functional Systems RHR Loop A WCS LPCS ADS RHR Loops B and C RCIC

2. DG-1A fails:

Inoperable-Systems Functional Systems RHR Loops B and C HPCS ADS RCIC RHR Loop A LPCS

3. DG-1B fails:

Inoperable System Functional Systems WCS ADS RCIC LPCS RHR Loops A, S, and C Note: With Unit 1 at power, DG-0 or 1A will not be allowed to be taken out of service for an extended time.

B. Unit 2 initially at full power, Unit 1 in cold shutdown, and DG-1A inoperable.

1. DG-0 fails:

same as A.1

2. DG-2A fails:

same as A.2

3. -DG-2B fails:

same as A.3 E-1

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S C. Unit 2 initially at full power, Unit 1 in cold shutdown, and DG-0 inoperable.

1. DG-1A fails:

Inoperable Systems Functional-Systems RHR Loop A WCS -

4 LPCS ADS RHR Loops B and C .

1 RCIC 1

4

2. DG-2A fails:

Inoperable-Systems Functional Systems s

RHR Loop A WCS i LPCS ADS RCIC RHR Loops B and C -

i after unit tie breakers closed i 3. DG-28 fails:

Inoperable Systems Functional Systems HPCS' ADS RHR Loop A RCIC l LPCS RHR Loops B and C I

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ML20134N445

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