Text

Amends 66 & 47 to Licenses DPR-58 & DPR-74,respectively, Revising Tech Specs to Allow Containment Purging During Operation & Purge Vent Mods Required as Part of TMI Action Plan
	ML17320A268
Person / Time
Site:	Cook
Issue date:	12/08/1982
From:	Varga S; Office of Nuclear Reactor Regulation
To:	;
Shared Package
ML17320A270	List: ML17320A268; ML17320A272; ML17320A274;
References
	NUDOCS 8301030288
	Download: ML17320A268 (19)
	v • d • e

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t UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 INDIANA AND MICHIGAN ELECTRIC COMPANY DOCKET NO. 50-315 D.

C.

COOK UNIT 1

AMENDMENT TO FACILITY OPERATING'LICENSE Amendment No.:66 License No.

DPR-58 1.

The A.

B.

C.

D.

E.

Nuclear Regulatory Commission (the Commission) has found that:

The application for amendment by Indiana and Michigan Electric Company (the licensee) dated August 30, 1982, as supplemented by letters dated October 29, 1982 and November 19, 1982, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act) and the Commission's rules and regulations set forth in 10 CFR Chapter I; The. facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations; The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

8301030288 821208 PDR ADQCK 05000315 p

2.

Accordingly, the license is amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No.

DPR-58 is hereby amended to read as follows:

(2)

Technical S ecifications The Technical Specifications contained in Appendices A and B, as revised through Amendment No. '66, are hereby incorporated in the license.

The licensee shall operate the facility,in accordance with the Technical Specifications.

3.

This license amendment is effective as of the date of its issuance.

FO THf NUCL R

R GULATORY COMMISSION

Attachment:

Changes to 'the Technical Specifications Date of Issuance:

December 8, 1982 Operating Reactors B anc No.

1 Division of Licensing

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UNITED STATES NUCL'EAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 INDIANA AND MICHIGAN'ELECTRIC'COMPANY DOCKET NO. 50-316 D.

C.

COOK UNIT 2 AMENDMENT TO FACILITY OPERATING LICENSE Amendment No.

47 License No.

DPR-74 1.

The Nuclear Regulatory Commission (the Commission) has found that:

A.

B.

C.

D.

The application for amendment by Indiana and Michigan Electric Company (the licensee) dated August 30, 1982, as supplemented by letters dated October 29, 1982 and November 19, 1982, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended'(the Act) and the Commission's rules and regulations set forth in 10 CFR Chapter I; The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Commission; There is reasonable assurance (i) that the activities authorized by this amendment can be conducted without endangering the health and safety of the public, and (ii) that such activities will be conducted in compliance with the Commission's regulations; The issuance of this amendment will not be inimical to the common defense and security or to the health and safety of the public; and E.

The issuance of this amendment is in accordance with 10 CFR Part 51 of the Commission's regulations and all applicable requirements have been satisfied.

2.

Accordingly, the license is amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No.

DPR-74 is hereby amended to read as follows:

(2)

Technical S ecifications The Technical Specifications contained in Appendices A and B, as revised through Amendment No. 47, are hereby incorporated in the license.

The licensee shall operate the facility in accordance with the Technical Specifications.

3.

This license amendment is effective as of the date of its issuance.

F THE NUCE R

EGULATORY COMMISSION even A.LYarga, Chi Operating Reactors r nch No.

1 Division of Licensin

Attachment:

Changes to the Technical Specifications Date of Issuance:

December 8, 1982

ATTACHMENT TO LICENSE AMENDMENTS AMENDMENT NO.

66 TO FACILITY OPERATING LICENSE NO.

DPR-58 AMENDMENT NO.

47 TO FACILITY OPERATING LICENSE NO.

DPR-74 DOCKET NOS.

50-315 AND 50-316 Revise Appendix A as follows:

Remove Pa es Unit 1

3/4 6-14 3/4 6-20 3/4 6-21 3/4 6-22 Insert Pa es 3/4 6-14 3/4 6-20 3/4 6-21 3/4 6-22 3/4 6-9a B 3/4 6-2a

'nit 2

3/4 6-'j3 3/4 6-25 3/4 6-26 3/4 6-32 3/4 9-9 3/4 6-13 3/4 6-25 3/4 6-26 3/4 6-32 3/4 6-9a B 3/4 6-2a 3/4 9-9

COHTAINf'lEHT SYSTEMS 3/4.6.3 CONTAINYiEHT !SOLATION VALVES LIMITING CONDITION FOR OPERATION 3.6.3.1 The containment isolation valves specified in Table 3.6-1 shall be OPERABLE with isolation times as shown in Table 3.6-1.

The ACTION statement of T/S 3/4.6.3 is not applicable to the containment purge sup-

'ply and exhaust isolation valves, VCR-101 through 106 and VCR-201 through 206, listed in Table 3.6-1.

The Limiting Condition for Operation and its associated ACTION statement for these valves is given in Technical Speci-fication 3/4.6.1.7.

APPLICABILITY:

HODES 1, 2, 3 and 4.

ACTION:

With one or more of the isolation valve(s) specified in Table 3.6-1 inoperable, either:

a.

b.

C.

d.

Restore the inoperable valve(s) to OPERABLE status within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , or Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least'ne deactivated automatic valve secured in the isolation position, or Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least one closed manual valve or blind flange, 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 .

SURVEILLANCE RE UIREtlEHTS 4.6.3.1.1 The isolation valves specified in Table 3.6-1 shall be, demonstrated OPERABLE:

a.

At least once per 92 days by cycling each OPERABLE power operated or automatic valve testable during plant operation through at least one complete cycle of full travel.

b.

Imnediately prior to returning the valve to service after maintenance, repair or replacement work is performed on the D. C.

COOK-UNIT I

. 3/4 6-14 Amendment. No.

66

'TABLE 3.6-1 Continued VALVE NUMBER FUNCTION TESTABLE DURING PLANT OPERATION ISOLATION TIME IN SECONDS P)tASE "8" ISOLATION Continued 44.

45, 46.

47.

48.

49

'0.

51.

52.

53

'4.

55

'6.

57 ~

58.

59.

60.

6lo 62.

63.

64.

65.

66.

67.

MCR-961 WCR-963 WCR-965 MCR-967 WCR-900 MCR-902 WCR-904 WCR-906 WCR-908 WCR-910 WCR-912 CR-914 MCR<<920 WCR-922 WCR<<924 WCR-926 WCR-928 WCR-930 MCR-932 WCR-934 WCR-960 MCR-962 WCR-964 MCR-966 NESW to Instr.

Rm. Bast Vent NESW from Xnstr.

Rm. Mest Vent NESW to Instr.

Rm. East Vent NESW from Instr.

Rm. West Vent NESW to RCP Lower Containment Vent 91 NESW from Lower Containment Vent 81 NESW to RCP Lower Containment Vent 82 NESW from Lower Containment Vent 82 NES14 to RCP Lower Containment Vent 83 NESW from Lower Containment Vent 83 NESW to RCP Lower Containment Vent t4 NESW'from Lower Containment Vent fI4 NHSW to RCP Upper Containment Vent IIl NESW from Upper Containment Vent IIl NESW to RCP Upper Containment Vent 82 NESW from Upper Containment Vent II2 NESW to RCP Upper Containment Vent II3 NESW from Upper Containment Vent II3 NESW to RCP Upper Containment Vent 84 NESW fram Upper Containment Vent 84

'NESW to Instrument Room East Vent

'ESW from Instrument Room, East Vent NESW to Instrument Room West Vent NESW from Instrument Room Mast Vent Yes Yes Yes Yes Yes'es Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 10 10 10 10 10 10 10 io 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 C.

CONTAINMENT PURGE AND EXllAUST a*

l.

2 ~

3 ~

4 ~

5 ~

6.

7.

8.

9.

10 ~

11.

VCR-101 VCR-102 VCR-103 VCR-104 VCR-105 VCR-106 VCR-107<

VCR-201 VCR-202 VCR-203 VCR-204 Instr.

Room Purge Air Inlet Instr.

Room Purge Air Outlet Lower Comp. Purge Air Inlet Lower Comp. Purge Air Outlet Upper Comp. Purge Air Inlet Upper Comp. Purge Air Outlet Cont. Press.

Relief Fan Isolation Instr.

Room Purge Air Inlet Instr.

Room Purge Air Outlet Lower Comp. Purge Air Inlet Lower Comp. Purge Air Outlet Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 5

5 5

TABLE 3.F'1 (Continued VALVE NUMBER FUNCTION TESTABLE DURING PLANT OPERATION ISOLATION TIME IN SECONDS nOOFl 12.

VCR-205 13 'CR-206 14'CR-207*

Upper Comp. Purge Air Inlet Upper Comp. Purge Air Outlet Cont. Press Relief Fan Isolation D. MANUAL ISOLATION VALVES C.

CONTAINMENT PURGE EXHAUST Continued Yes Yes

'es 5'5 I 5 QlI 1 ~

ICM-111 2.

ICH-129 3.

ICM-250

.4. 'CH-251 5.

ICI1-260 6.

ICH-265 7.

ICH-305 8 ~

ICH-306 9.

ICH-311 10.

ICH-321.

11'l'X 151 VI 12'A 145 13.

SF-151 14.

SF-153 15 'F-159 16.

SF-160 17'I-171 18.

SI-172 RIIR to RC Cold Legs kllR Inlet to Pumps Boron In)ection Inlet Boron In)ection Inlet Safety In)ection Inlet Safety In)ection Inlet RIIR Suction'rom Sump RIIR Suction from Sump RIIR to RC llot Legs RllR to RC llot Legs Dead Weight Tester Containment Service Air Refueling Water Supply Refueling Water Supply Refueling Cavity Drain to Purification Refueling Cavity Drain to Purification Safety Infection Test Line Accumulator Test Line System System Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes NA NA NA NA NA NA NA NA NA NA NA NA NA, NA NA NA

'A NA O

VALVE NUMBER FUNCTION TESTABLE DURING PLANT OPERATION ISOLATION TIME IN SECONDS D. MhNUAL ISOLATION VhLVES Continued)

(1) 19.

20.

21

'2.

23.

24.

25.

26.

27

'8.

29.

30

'CR-440 CCR-441 HCH-221 HCH-231 CCM-430 CCM-431 CCM-432 CCM-433 SH-8~

SM-10<

SH-4*

SH-6<

CCW from Hain Steam Penetration CCW from Hain Steam Penetration Hain Steam to Auxiliary Feed Pump Main Steam to Auxiliary Feed Pump CCW to East Pressure Equalization Fan CCW from East Pressure Equalization Fan CCW to West,Pressure Eqtialization Fan CCW from West Pressure Equalization Fan Upper Containment Sample Upper Containment Sample Instrument Room Sample Instrument Room Sample Yes Yes No No Yes Yes Yes Yes Yes Yes Yes Yes NA NA PA DNA NA NA NA NA NA NA NA NA

'NA (1)

A' Manual Valve-Isolation time not applicable.

- Includes motor operated valves which do not isolate automatically.

Hay he opened on nn intermittent basis under administrative control.

Containment purge supply and exhaust isolation valves (VCR>>101 through 106 and VCR-201 through 206) may be opened under Technical Specification 3/4.6.1.7.

r ll g

I CONTAINMENT SYSTEMS CONTAIAKNT VENTILATION SYSTEM LIMITING CONDITION FOR OPERATION 3.6.1.7 The containment purge supply and exhaust isolation valves shall be closed except when operation of the containment purge system i.s required for safety related reasons.

No more than one purge supply path and one purge exhaust path shall be open at a time.

APPLICABILITY:

MODES 1, 2, 3, and 4.

ACZION:

a. 'i.th one containment purge supply and/or one exhaust isolation valve inoperable, isolate the affected penetration by use of at least one automatic valve secured in the closed position, and, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , either:

2)

Restore the inoperable valve to OPERABLE status,, or, N

Deactivate the automatic valve secured in the closed position.

b.

Operation may then continue until performance of the next required valve test provided that the automatic valve secured in the closed position is verified to be deactivated in the closed position at least once per 31 days.

c.

Otherwise, 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 ..

d.

The provisions of Specification 3.0.4 are not, applicable.

SURVEILLANCE'REQUIREMENTS 4.6.1.7.1 The surveillance requirements of Technical Specification 3/4.6.3.1 apply.

D. C.

COOK - UNIT 't 3/4 6-9a Amendment; Ho.

66

CONTAIlPKNT SYSTEMS BASES 3/4.6.1.7 CONTAINMENT PURGE AND EXHAUST ISOLATION VALVES This specification ensures that the containment purge supply and exhaust isolation valves are closed for the ma5ority of the time during normal operation.

It allows for containment purging for safety related reasons'afety-related reasons are meant to be the need to improve containment working conditions, e.g.

reduce airborne activity, to perform surveillance and/or maintenance on a safety-related system or piece of equipment.

The purge/vent system shall not be used to control contain-ment atmosphere temperature and humidity. It is intended that purging and venting times will be as short as possible.

Allowing purge operations in Modes 1, 2, 3, and 4 is more beneficial than a cooldown to Mode 5 from the standpoint of (a) imposing unnecessary thermal stress cycles on the reactor coolant system and its components and (b) reducing the potential for causing unnecessary challenges to the reactor trip and safeguards systems.

The containment purge system is designed in accordance with the requirements of NRC Branch Technical Position CSB 6-4, Rev.

1.

This i&eludes, but is not limited to, an analysis of the impact of purging on ECCS performance, an evaluation of the radiological consequences of a design basis accident while purging, and limiting purge operation to using no more than one supply path and one exhaust path at a time.

The purge isolation valves have been demonstrated capable of closing against the dynamic forces associated with a loss-of-coolant accident and are assured of receiving a Containment Ventilation Isolation signal.

Reset switches have been protected against inadvertent use in a manner which facilitates the administrative controls governing their use.

The use of the pressure relief (vent) line is allowed for containment pressure control.

The purge and vent isolation valves do not use resilient seating/sealing material and are not sub5ect to the type of environmental degradation common to resilient materials.

The D. C..Cook purge estimate goal is two hundred (200) hours each ear foor each unit.

This purge estimate is based on a plant capacity factor of 77%,

and accounts for two purge operations per week.

Each purge operation is assumed to be approximately 2 1/2 hours in duration.

The annual 200-hour purge operation time limit amounts to less than 3% of the estimated plant operation time in Modes 1 through 4.

D.

C.

COOK - UNIT 1 B 3/4 6-2a Amendment No, 66

CONTAINMEHT SYSTEMS 3/4.6.3 CONTAINMENT ISOLATION VALVES LIMITING CONDITION FOR OPERATION 3.6.3.1 The containment isolation valve" specified in Table 3.6-1 shall be OPERABLE with isolation times as shown in Table 3.6-1.

The ACTION statement of Technical Specification 3/4.6.3 is not applicable to the containment purge and exhaust isolation valves, VCR-101 through 106 and VCR-201 through 206, listed in Table 3.6-1.

The Limiting Condition for Operation and its associated ACTION statement for these valves is given in Technical Specification 3/4.6.1.7.

APPLICABILITY: =-Modes 1, 2, 3 and 4.

ACTION:

Mith one or more of the isolation valves(s) specified in Table 3.6-1 inoperable, maintain at least one isolation valve OPERABLE in each affected penetration that is open and either:

Restore the inoperable valve(s) tD OPERABLE status within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , or b.

Co Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least one deactivated automatic valve secured in the isolation position, or Isolate each affected penetration within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months by use of at least one closed manual valve or blind flange; o'

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 .

SURVEILLANCE RE UIREMENTS'.6.3.I.1

.The isolation valves specified in Table 3.6-1 shall be demonstrated OPERABLE prior to returning the valve to service after maintenance, repair or replacement work is performed on the valve or its associated

actuator, control or power circuit by performance of a cycling test and verification of isolation time.

D. C.

COOK - UNIT 2 3/4 6-13 Amendment Ho.

47

~

0

~

TABLE 3.6-1 Continued CONTAINMENT ISOLATION VALVES VALVE NUMBER FUNCTION ISOLATION TIME IN SECOND B.

PHASE "B" ISOLATION Continued OO

~l 56 i WCR-920 57 'CR-922 58'CR-924 59.

WCR-926 60.

WCR-928 61 'CR-930 62; WCR-932 63 'CR-934 NESW to RCP Upper Containment Vent 01 NESW from Upper Containment Vent 81 NESW to RCP Upper Containment Vent P2 NESW from Upper Containment. Vent 82 NESW to RCP Upper Containment Vent 83 NESW from Upper Containment Vent II3 NESW to RCP Upper Containment Vent 04

.I NESW from Upper Containment Vent 84

<10 410

, <10

'4 ~

WCR-960 65 'CR-962 66.

WCR<<964 R-NESW to Instrument Room Eqst Vent NESW from Instrument Room East Vent NESW to Instrument Room West Vent NESW from Instrument Room West Vent 67.

WC 966 C.

'ONTAINMENT PURGE AND EXHAUST **-

<10 o

2 ~

3 ~

VCR-101 VCR-102 VCR-103 4.

VCR-104 5.

VCR-105 Instr.

Room Purge Air Inlet

Instr, Room Purge Air Outlet Lower Comp. Purge Air Inlet Lower Comp. Purge Air Outlet Upper Comp. Purge Air Inlet.

45

~ g5

1 C

I

~g TAl'.LE 3.6-1 (Continued)

COHTAINHEHT ISOLATION'ALVES VALVE NUMBER FUNCTION ISOLATION TIME IN SECONDS C.

CONTAIHMEHT PURGE AND EXHAUST Continued

~ Z0 D.

6.

VCR-106 7.

VCR-107" 8.

VCR-201 9.

VCR-202 10.

VCR-203 11.

VCR-204 12.

VCR-205 13.

VCR-206 ln.

VCR-20>*

MANUAL ISOLATION VALVES (1) 1 1CM-111h 2.

1CM-129 Upper Comp.

Purge Air Outlet Cont. Press.

Relief Fan Isolation Instr.

Room Purge Air Inlet Instr.

Room Purge Air Outlet Lo~er Comp.

Purge Air Inlet Lower Comp.

Purge Air Outlet Upper Comp.

Purge Afr Outlet Upper Comp.

Purge Air Outlet Cont.

Press Relief Fan Isolation BHR to RC Cold Legs.--

RHR Inlet to Pumps c

5 5

c 5

5 c

5

(

5 5

c 5

TCbLE 3.6-1 (Continued)

CONTAIHMFNT ISOLATION VALVES TABLE NOTATION Hay be opened on an intermittent basis under administrative control, Not subject to Type "8" or "C" Leak Tests.

r ~

NA Check valves, blind flanges on normally closed valves which do not receive containment isolation signals; isolation time not applicable.

(1)

Includes motor operated valves which do not isolate automatically'.

Containment purge supply and exhaust isolation valves (VCR-101 through 106 and

'CR-201 through 206) may be opened under Technical Specification 3/4.6.1.2.

CONTAIN'T SYSTEMS CONTAIAKNT VENTILATION SYSTEM LIMITING CONDITION FOR OPERATION 3.6,1.7 The contaizzment purge supply and exhaust isolation valves

'hall be closed except when operation of the containment purge system is required for safety related reasons.

No more than one purge supply path and one purge exhaust path shall be open at a time.

APPLICABILITY:

MODES 1, 2, 3, and 4 ~

ACTION a.

Qith one containment purge supply and/or one exhaust isolation valve inoperable, isolate the affected penetration by use of at least one automatic valve secured in the closed position, and, within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , either:

1)

Restore the inoperable valve to OPERABLE status, or, V

2)

Deactivate the automatic valve secured in the closed" position,'.

Operation may then continue until performance of the next required valve test provided that the automati.c valve secured in the closed position is verified to be deactivated in the closed position at least once per 31 days.

c.

Otherwise, 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 .

d.

The provisions of Specification 3.0.4 are-not applicable.

SURVEILLANCE REQUIREMENTS 4.6.1,7.1 The surveillance requirements of Technical Specification 3/4.6.3.1 apply.

D.

C; COOK'- UNIT 2 3/4 6-9a Amendment No.

47

CONTAINMENT SYSTEMS BASES 3/4.6.1.7 CONTAINMENT PURGE AND EXHAUST ISOLATION VALVES This specification ensures that the containment purge supply and exhaust isolation valves are closed for the ma)ority of the time during normal operation. It allows for containment purging for safety related reasons'afety-related reasons are meant to be the need to improve containment working conditions, e.g.

reduce airborne activity, to perform surveillance and/or maintenance on a safety-related system or piece of equipment.

The purge/vent system shall not be used to control contain-ment atmosphere temperature and humidity. It is intended that purging and venting times will be as short as possible.

Allowing purge operations in Modes 1, 2, 3, and 4 is more beneficial than a cooldown to Mode 5 from the standpoint of (a) imposing unnecessary thermal stress cycles on the reactor coolant system and its components and (b) reducing the potential for causing unnecessary challenges to the reactor trip and safeguards systems.

The containment purge system is designed in accordance with the requirements of NRC Branch Technical Position CSB 6-4, Rev. 1.

This includes, but is not limited to, an analysis of the impact of purging on ECCS performance, an evaluation of the radiological consequences of a design basis accident while purging, and limiting purge operation to using no more than one supply path and one exhaust path at a time.

The purge isolation valves have been demonstrated capable of closing against the dynamic forces associated with a loss-of-coolant accident and are assured of receiving a Containment Ventilation Isolation signal.

Reset

'switches have been protected against inadvertent use in a manner which facilitates the administrative controls governing their use.

The use of the pressure relief (vent) line is allowed for containment pressure control.

The purge and vent isolation valves do not use resilient seating/sealing material and are not subject to the type of environmental degradation common to resilient materials.

The D. C.

Cook purge estimate goal is two hundred (200) hours each year for each unit.

This purge estimate is based on a plant capacity factor of 77%,

and accounts for two purge operations per week.

Each purge operation is assumed to be approximately 2 1/2 hours in duration.

The annual 200-hour purge operation time limit amounts to less than 3% of the estimated plant operation time in Modes 1 through 4.

D, C,'OOK - UNIT 2 B 3/4 6-2a

'Anendment No, 47.

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ML17320A268

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