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Proposed Tech Specs Re Svc Water Cooling Tower Loop Electrical Supply
	ML20113B203
Person / Time
Site:	Seabrook
Issue date:	06/20/1996
From:	; NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO)
To:	;
Shared Package
ML20113B181	List: ML20113B178; ML20113B191; ML20113B203;
References
	NUDOCS 9606260243
	Download: ML20113B203 (11)
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II. MARKUP OF PROPOSED CIIANGES See attached markup of proposed changes to Technical Specifications. '

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. ELECTRICAL POWER SYSTEMS n e d foll y ener[ zed re<n egi2 4 Uke-ONSITE POWER DISTRIBUTION bus w&k 7 days , o e be A HOT

. OPERATING

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LIMITING CONDITION FOR OPERATION l 3.8.3.1 (Continued)

1. Train A. 125-volt D.C. Busses consisting of:

1) 125-volt D.C. Bus #11A energized from Battery Bank 1A* or 1C* and l

2) 125-volt D.C. Bus #11C energized from Battery Bank 1C* or 1A*

j. Train B. 125-volt D.C. Busses consisting of:

1) 125-volt D.C. Bus #11B energized from Battery Bank 1B* or 1D*. and

2) 125-volt D.C. Bus #110 energized from Battery Bank 1D* or 1B*.

APPLICABILITY: MODES l'. 2. 3. and 4.

ACTION: (eScep4 950-veli Ge*5e9 Bus *f Gk

a. With one of the required trains of A.C. emergency buss not fully energized reenergize the train within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-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 <

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following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . I

b. With one A.C. vital panel either not energized from its associated l inverter, or with the inverter not connected to its associated D.C. bus: l (1) reenergize the A.C. vital panel 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 ; and (2) reenergize the A.C. vital panel from its associated inverter connected to its associated D.C. bus 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 1 SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months , l

c. With one D.C. bus not energized from its associated battery bank.

reenergize the D.C. bus from its associated battery bank or close the bus tie to the alternate OPERABLE battery of the same train 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 . !

l SURVEILLANCE REQUIREMENTS 4.8.3.1 The specified busses and panels shall be determined energized in the recuired manner at least once per 7 days by verifying correct breaker alignment and incicated voltage on the busses.

No more thar, one Battery Gank (lA.1B. IC, or 10) at a time may be taken out of service for more than 30 days.

SEABROOK - UNIT 1 3/4 8-17

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1 III. RETYPE OF PROPOSED CIIANGES See attached retype of proposed changes to Technical Specifications. The attached retype reflects the currently issued version of Technical Specifications. Pending Technical Specification changes or Technical Specification changes issued subsequent to this subrnittal are not reflected in the enclosed retype. The enclosed retype should be checked for continuity with Technical Specifications prior to issuance.

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Revision bars ace provided in the right hand margin to designate a change in the, text.

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ELECTRICAL POWER SYSTEMS ONSITE POWER DISTRIBUTION OPERATING LIMITING CONDITION FOR OPERATION j

'l 3.8.3.1 (Continued)

1. Train A 125-volt D.C. Busses consisting of:

1) 125-volt D.C. Bus #11A energized from Battery Bank 1A* or 1C*, and

2) 125-volt D.C. Bus #11C energized from Battery Bank 1C* or 1A*,

j. Train B 125-volt D.C. Busses consisting of:

1) 125-volt D.C. Bus #118 energized from Battery Bank 1B* or 1D*, and

2) 125-volt D.C. Bus #110 energized from Battery Bank 1D* or 1B*.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

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a. With one of the required trains of A.C. emergency busses (exce)t 480-volt 1 Emergency Bus # E64) not fully energized, reenergize the tra'n within 8 I hours 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 I SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

1. With 480-volt Emergency bus #E64 not fully engergized, reenergize the bus within 7 days or be in HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ,

b. With one A.C. vital panel either not energized from its associated inverter, or with the inverter not connected to its associated D.C. bus:

(1) reenergize the A.C. vital panel 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 ; and (2) reenergize the A.C. vital panel from its associated inverter connected to its associated D.C. bus within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at l 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 i following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With one D.C. bus not energized from its associated battery bank, l reenergize the D.C. bus from its associated battery bank or close the bus tie to the alternate OPERABLE battery of the same train 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 3.0 hours0 days 0 hours 0 weeks 0 months .

SEABROOK - UNIT 1 3/4 8-17 Amendment No.

ELECTRICAL POWER SYSTEMS ONSITE POWER DISTRIBUTION OPERATING LIMITING CONDITION FOR OPERATION l l

i SURVEILLANCE REQUIREMENTS i l

4.8.3.1 The specified busses and panels shall be determined energized in the required I manner at least once per 7 days by verifying correct breaker alignment and indicated voltage on the busses l

No more than one Battery Bank (lA.1B,1C, or 1D) at a time may be taken out l of service for more than 30 days. I I

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4 SEABROOK - UNIT 1 3/4 8-17a Amendment No.

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IV. DETERMINATION OF SIGNIFICANT IIAZARDS FOR PROPOSED CHANGES in accordance with 10CFR50.92, North Atlantic t.as reviewed the proposed changes and has concluded l that they do not involve a significant hazards consideration. The proposed changes do not involve a significant har~!3 consideration because the changes do not:

A. Involve a significant increase in the probability or consequences ofan accident previously evaluated.

The accident of concern is an accident requiring engineered safety features actuation concurrent with a loss of offsite power. During this postulated accident the function of the Service Water System is to transfer the heat removed by the Primary Component Cooling Water System and from the Diesel Generator Jacket Water Cooling System to the ultimate heat sink, either the Atlantic Ocean or the mechanical draft cooling tower. Operation of any one of the 2 service water loops or any one of the 2 service water cooling tower loops assures that the intended safety function of the Service Water System is satisfied.

North Atlantic proposes to increase the current 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months allowed outage time for US-E64 to a 7 day I allowed outage time. The 7 day allowed outage time is consistent with the allowed outage time l pc.mitted by Technical Specification 3.7.4 Action b for an inoperable service water cooling tower loop. l The 7 day allowed outage time is reasonable because US-E64 only supplies electrical power only to l components associated with the Train B service water cooling tower loop. The loads associated with '!

US-E64 are listed in Table 1. j 1

If US-E64 inoperable, there remains redundant, operable equipment within the same Train which is capable of supporting continued plant operation. The Seabrook Station Service Water System consists of two independent trains each of which can operate with either a service water pump loop or a service water cooling tower pump loop. Each service water loop consists of a service water pump and the piping I

, valves and other components necessary to provide a Dowpath for heat removal. Each service water I cooling tower loop consists of a service water cooling tower pump, and the necessary piping, valves and other components required to provide its flow path. The ultimate heat sink for the service water loop is the Atlantic Ocean whereas the ultimate heat sink for the service water cooling tower loop is a mechanical draft cooling tower. The operability of the Service Water System ensures that sufficient cooling capacity is available for continued operation of safety related equipment during normal and accident conditions. Because US-E64 supplies electrical power only to components associated with service water cooling tower loop Train B, the inoperability of US-64 does not affect any of the components associated with service water loop Train B nor does it affect any Train A components.

Thus, if US-E64 is inoperable the Train B service water loop remains operable and capable of providing cooling during normal and accident conditions in addition to the Train A service water and cooling tower service water loops.

i j Therefore, since the response of the plant of the plant to an accident is unchanged, the proposed change l will not result in a significant increase in either the probability or consequences of an accident previously j evaluated.

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B. Create the possibility ofa new or different kind ofaccidentfrom any accidentpreviously ,

evaluated. l The proposed change does not affect the operation or response of any plant equipment or introduce any new failure mechanisms. The proposed change makes the allowed outage time for US-E64 equivalent to l

the allowed outage time for one service water cooling tower loop being inoperable. The proposed 7 day l

allowed outage time is reasonable because US-E64 provides power orily to components associated with l Train B service water cooling tower loop. Therefore, there are no new or different accident scenarios introduced by the proposed change.

C. Involve a significant reduction in the margin ofsafety. l l

The proposed change does not involve a significant reduction in the margin of safety as defined in the l bases of the Technical Specifications. North Atlantic proposes to replace the current 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months allowed outage time for US-E64 being inoperable with a 7 day allowed outage time. The 7 day allowed outage time is equivalent to the allowed outage time permitted by Technical Specification 3.7.4 Action b for an inoperable service water cooling tower loop. T he 7 day allowed outage time is reasonable because US- i E64 supplies electrical power enly to components only associated with the Train U service water cooling l tower loop. The loads associated with US-E64 are listed in Table 1. l The Bases for Technical Specification 3.8.3.1 states in part that the operability of the AC power sources and distribution systems ensures that sufficient power is available to supply safety related equipment l required for the safe shutdown of the facility and the mitigation and control of accident conditions within I the facility and that the action requirements specified for the levels of degradation provide restriction for continued plant operation commensurate with the level of degradation.

If US-E64 is inoperable, there remains redundant, operable equipment within the same Train which is capable of supporting continued plant operation. The Seabrook Station Service Water System consists of I two independent trains each of which can operate with either a service water pump loop or a service water cooling tower pump loop. Each service water loop consists of a service water pump and the piping, valves and other components necessary to provide a flowpath for heat removal. Each service water cooling tower loop consists of a service water cooling tower pump, and the necessary piping, valves and other components required to provide it's flow path. The ultimate heat sink for the service water loop is the Atlantic Ocean whereas the ultimate heat sink for the service water cooling tower loop is a mechanical draft cooling tower. The operability of the Service Water System ensures that sufficient cooling capacity is available for continued operation of safety related equipment during normal and accident conditions. Because US-E64 supplies electrical power only to components associated with service water cooling tower loop Train B, the inoperability of US-E64 does not affect any of the components associated with service water loop Train B nor does it affect any Train A components.

Thus, if US-64 is inoperable the Train B service water loop remains operable and capable of providing cooling during normal and accident conditions in addition to the hin A service water and cooling tower service water loops.

Technical Specification 3.8.3.2, Onsite Power Distribution - Shutdown, apparently recognizes that US-E64 supplies electrical power to Train B service water cooling tower loop components only by specifically excluding it from the Limiting condition for Operation. Technical Specification 3.8.3.2 is applicable in Modes 5 and 6, in these Modes there is no requirement for the Service Water System to be 6

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j operable. Thus, it appears that for Modes 5 and 6, the Technical Specifications recognize that US-E64 supplies power to Train B service water cooling tower loop components only.

North Atlantic believes that the proposed change to increase the 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months allowed outage time for US-E64 being inoperable with a 7 day allowed outage time makes no reduction in the capability of the Service Water System to perform its intended safety function. l Therefore, the assumptions in the bases of the Technical Specifications are not affected and the proposed change will not result in a significant reduction in the margin of safety.

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I V. PROPOSED SCIIEDULE FOR LICENSE AMENDMENTISSUANCE AND l EFFECTIVENESS j North Atlantic requests issuance of the License Amendment by August 1,1996, with the amendment !

effective as of the date ofissuance, to be implemented within 60 days of the date ofissuance, j

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l VI. ENVIRONMENTAL IMPACT STATEMENT North Atlantic has reviewed the proposed License Amendment Request against the criteria of 10CFR51.22 for environmental considerations. The proposed changes do not involve a significant hazards consideration, nor increase the types and amounts of effluents that may be released offsite, nor significantly increase individual or cumulative occupational radiation exposures. Based on the foregoing, North Atlantic concludes that the proposed changes meets the criteria deln.eated in j 10CFR50.22(c)(9) for a categorical exclusion fron' the requirements for an Environmental Impact Statement.

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. TABLE 1 480V UNIT SUBSTATION 1-EDE US-64 LOADi 11S-fd4 l SERVICE WATER COOLING TOWER FAN 1-SW-FN-51B SERVICE WATER COOLING TOWER FAN 2-SW.FN-51B 460V MCC-E641 MOTOR CONTROL CENTER l-EDE-MCC-641 LOADS l l

MCC-E641 SW SYSTEM PROCESS IIEAT TRACING DISTR. PNL. H f-CP-429 COOLING TOWER SW PUMP 110B TEST / BYPASS VLV. SW-V26 COOLING TOWER SW PUMP 110B DISCHARGE VLV. SW-V25 COOLING TOWER FAN SlB GEAR REDUCER IMMERSION HEATER SW-H-67B COOLING TOWER FAN 2-51B GEAR REDUCER IMMERSION HEATE12-SW-H-67B COOLING TOWER SPRAY BYPASS RECIRC VLV SW-V140 COOLING TOWER SW PUMP 110B TEST RECIRC VLV SW-V27 COOLING TOWER SWGR RM TRAIN B SUPPLY FAN SWA-FN-63 COOLING TOWER SWGR RM TRAIN B EXHAUST FAN SWA-FN-70 COOLING TOWER SWGR RM TRAIN B HEATER SWA-UH-ll4 COOLING TOWER SWGR RM TRAIN B IIEATER SWA-UH-il5 480-120/240V XFMR FOR 12 CIRCUIT DISTR. PNL. (See 'Iable 4)

HT-CP-429 l

COOLING TOWER PUMP DISCHARGE NORMAL SYSTEM HEATER HT-H-301 A COOLING TOWER PUMP DISCHARGE BACKUP SYSTEM HEATER HT-H-301B COOIING TOWER SPRAY BYPASS HEADER NORMAL SYSTEM HEATER HT-H-302A COOLING TOWER SPRAY BYPASS IIEADER BACKUP SYSTEM HEATER HT-H-302B ,

1 EH'i-hiCC-641 MOTOR IIEATERS:

1-SW-V140 IITR l-SW-V26-HTR l-SW-V25 HTR l-SW-V27-IITR l-SWA FN-63-HTR l-SWA FN-70-HTR l-SW 12N-51B-HTR 2-2W-FN-51 B-1ITR SPACE HEATERS:

1-EDE-US-64 HTR l-EDE-MCC-641-IITR shunt trip coil for heat tracing panel (ht-cp-429)

NOTE: All loads are Train B only 10

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ML20113B203

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