ML20072V360

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Proposed Tech Specs Revising Frequency for Verifying Position of drywell-suppression Chamber Vacuum Breakers from at Least Once Every 72 H to at Least Once Every 14 Days
ML20072V360
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 09/09/1994
From:
CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20072V352 List:
References
NUDOCS 9409190332
Download: ML20072V360 (18)
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Text

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1 ENCLOSURE 5 BRUNSWICK STEAM ELECTRIC PLANT, UNIT 1 AND 2 NRC DOCKETS 50-325 AND 50-324 l

OPERATING LICENSES DPR-71 AND DPR-62 l

REQUEST FOR LICENSE AMENDMENT DRYWELL-SUPPRESSION CHAMBER VACUUM BREAKERS l

MARKED-UP TECHNICAL SPECIFICATION PAGES - UNIT 1 I

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CONTAINMENT SYSTEMS 3/4.6.4 VACUUM RELIEF DRYWELL - SUPPRESSION CHAMBER VACUUM BREAKERS LIMITING CONDITION FOR OPERATION All dryvell-suppression chamber vacuum breakers shall be OPERABLE and 3.6.4.1 in the closed position with:

The position indicator OPERABLE, and a.

An opening set point of less than or equal to 0.5 psid.

b.

APPLICABILITY: OPERATION /.L CONDITIONS'1, 2, and 3.

ACTION:

With no more than 2 drywell-suppression chamber vacuum breakers inoperable for opening but known to be in the closed position, the a.

provisions of Specification 3.0.4 are not applicable and operation COLDSHUTgWNprovidedthesurveillance may continue until the next requirements of Specification 4.6.4.1.y are performed on the OPERABLE least once per 15 days vacuum breakers' within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and at thereafter, until the inoperable vacuum breakers are restored to

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OPERABLE status; otherwise, be in at least HOT SHUTDOWN within the 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 />.

next With one drywell-suppression chamber vacuum breaker in the open b.

the position, as indicated by the position indicating system, applicable and operation may p'rovisions of Specificaton 3.0.4 are not continue provided the surveillance requirements of Specification 4.6.4.1.p are performed on the OPERABLE vacuum breakers, and the surveillance requirements of Specification 4.6.4.1.y Sre performed 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 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter, until the inoperable vacuum breaker is restored to the closed position; 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and otherwise, be in at least HOT SHUTDOWN within the next 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 />.

With the position indicator of any drywell-suppression chamber vacuum c.

breaker inoperable, the provisions of Specification 3.0.4 are not rovided the surveillance applicabre, and operation may continue p$re performed within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> requirementsofSpecificgig4.6.4.1.y once per y ___,. thereafter, until the inoperable and at least position indicator is' returned to OPERABLE status; otherwise, 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 />.

Amendment No. [

BRUNSWICK - UNIT 1, 3/4 6-18

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CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS 4.6.4.1 Each drywell-suppression chamber vacuum breaker shall be demonstrated OPERABLE:

lo p.

At least once per 31 days.and after any discharge of steam to the suppression chamber from any source, by exercising each vacuum breaker through one complete cycle and verifying that each-vacuum breaker is closed as indicated by the position indication system.

C. )f.

Whenever a vacuum breaker is in the open position, as indicated by the position indication system,.by conducting a test that' verifies that the differential pressure is maintained greater than 1/2 the l

initial delta P for one hour without N2 makeup.

d f.

At least once per 18 months during shutdown by:

1.

Verifying the opening setpoint, from the closed position, to be-less than or equal to 0.5 psid,.

l 2.

Performance of a CHANNEL CALIBRATION that each position indicator indicates the vacuum breaker to be open.if the vacuum breaker does not satisfy the delta P test in 4.6.4.1.y.

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.h ADD:

o.. At least once per 14 days and wikhin 2. hours ohr any dischar a oE Sktam ko khe sgression chamb h0m ng Source.3 Vertf e.ach Vacuum brealcer IS c.losed a5 indicahd by tne posib*on i.ndtcak,in Sysh ern, i

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BRUNSWICK - UNIT 1 3/4 6-19 Amendment No. [

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CONTAINMENT SYSTEMS BASES 3/4.6.3 PRIMARY CONTAINMENT ISOLATION VALVES (Continued)

A list of automatic closing primary containment isolation valves and their associated closure times shall be available at the plant in accordance with Section 50.71(c) of 10 CFR Part 50.

The addition and deletion of primary containment isolation valves shall be made in accordance with Section 50.59 of 10 CFR Part 50, 3/4.6.4 VACUUM RELIEF Vacuum reliet breakers are provided to equalize the pressure between the drywell and suppression pool and the suppresrion pool and reactor building.

This system will maintain the structural integrity of the containment under conditions of large differential pressures.

s Thc vacuum brcskers between the drywell and the suppression pool must not be inoperable in the open position since this would allow bypassing of the suppression pool in case of an accident. There are an adequate number of valves to provide some redundancy so that operation may continue with no more than 2 vacuum breakers inoperable and secured in the closed position.

M l>JGERT ( Atinched Each set of vacuum relief valves between the suppression chamber and reactor building provides 100% relief, which may by required in the unlikely event

,j that negative pressures develop in the primary containment.

The Nitrogen Backup System provides backup motive power for these suppression pool-react or building vacuum breakers on a loss of instrument air.

The normal non-interruptible inst rument air system f or these vacuum breakers is designed Seismic Class I system supplied by air compressors powered f rom the as a emergency buses. The Nitrogen System serves as a backup to that air system and thus the loss of the Nitrogen System, or portions thereof, dues not make the vacuum breakers inoperable. The design allows for the out ot service times in Actions b and c.

The Nitrogen Backup System is added to the Suppression Pool-Reactor Building Vacuum Breaker specification t o sati s t y NRC concerns relative to 10 CFR 50.44(c)(3) as addressed in the Brunswick Safety Evaluation Report dated October 30, 1986 concerning Ceneric Letter 84-09.

I Pressurization to 1130 psig assures sufficient system capacity to provide 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of operation with design valve actuation and system leakage.

3/4.6.5 SECONDARY CONTAINMENT I

Secondary containment is designed to minimize any ground level release of radioactive material which may result from an accident. The reactor building provides secondary containment during normal operation when the drywell is sealed and in service. When the reactor is shut down, or during refueling, the drywell may be open and the reactor building then becomes the primary containment.

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4 BRUNSWICK - UNIT 1 B 3/4 6-5 Amendment No. JJ4P --

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The 14 day frequency stated in Specification 3.6.4.1, ACTION c and Specification'4.6.4.1 is based on engineering judgement, is considered adequate in view of'other indications of vacuum breaker status available to operations-personnel, and has been chown to be acceptable through operational experience.

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ENCLOSURE 6 BRUNSWICK STEAM ELECTRIC PLANT, UNIT 1 AND 2 NRC DOCKETS 50-325 AND 50-324 OPERATING LICENSES DPR-71 AND DPR-62 REQUEST FOR. LICENSE AMENDMENT ~

DRYWELL-SUPPRESSION CHAMBER VACUUM BREAKERS MARKED-UP TECHNICAL SPECIFICATION PAGES - UNIT 2 i

CONTAINMENT SYSTEMS 3/4.6.4 VACUUM RELIEF DRYWELL - SUPPRESSION CHAMBER VACUUM BREAKERS LIMITING CONDITION FOR OPERATION 1

3.6.4.1 All drywell-suppression chamber vacuum breakers shall be OPERABLE and in the closed position with:

The position indicator OPERABLE, and a.

b.

An opening setpoint of less than or equal to 0.5 psid.

i APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTIOM:

With no more than 2 drywell-suppression chamuer vacuum breakers a.

the inoperable for opening but known to be in the closed position, provisions of Specification 3.0.4 are not applicable and operation may continue until the next COLD SHUTgOWN provided tiie surveillance requirements of Specification 4.6.4.1.jr are performed on the OPERABLE vacuum breakers within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and at least once per 15 days 3

thereafter until the inoperable vacuum breakers are restored to OPERABLE status; otherwise, be in at least HOT SHUTDOWN within the 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 />.

next b.

With one drywell-suppression chamber vacuum breaker in the open position, as indicated by the position indicating system, the provisions of Specification 3.0.4 are not applicable and operation may contigye provided the surveillance requirements of Specification 4.6.4.1.,g are performed on the OPERABLE vacuum breakers and the

. surveillance requirements of Specification 4.6.4.1.,g# re performed h

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 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> thereafter until the inoperable vacuum breaker is restored to the closed position; otherwise, 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 />.

With the position indicator of any drywell-suppression chamber vacuum c.

breaker inoperable, the provisions of Specification 3.0.4 are not applicable and operation may continue, provided the surveillance requirementsofSpecifieggADUEon 4.6.4.1.f are performed within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter until the inoperable least once per "

and at position indicator is returned to OPERABLE status; otherwise, 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 SHUTDOVN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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4 BRUNSWICK - UNIT 2 3/4 6-18 Amendment No.9 -

v, r:. CONTAX.W.ENT SYSTE.$1S SURVEILLANCE REQUIREMENTS 4.6.4.1 Each drywell-suppression chamber vacuum breaker shall be demonstrated OPERABLE: h/. At-least once per 31 days and af ter any discharge of steam to the suppression chamber from any source, by exercising eadi vacuum breaker ' through one complete cycle and verif ying that each vacuum c breaker is closed as indicated by the position : indication system. i C f. Whenever a vacuum breaker is in the open position, as indicated by the position. indication systam, by conducting a test that verifies that the differential pressure is maintained greater than 1/2 the l initial delta P for one hour without N2 makeup. d g. At least once per 18 months during shutdown by: 1. Verifying the opening s'tpoint, from the closed position,.to be e less than or equal to 0.5 psid, l 2. Performance of a CHANNEL CALIBRATION that.each position indicator indicates the vacuum breaker to be open if the vacuum-breakerdoesnotsatisfythedeltaPtestin4.6.4.1./. C 3 Ano_ '. o.. At least once per 14 clays a.nd within 2. hours after o.ny chscharge of skeam to the suppressien chamber-hrom anf ource, VerlEy each Vacuum bracdcar E6 G c.losed OS i.ndlCQktd by hbt @0Sikion I.nd[CAkin} Sy5 kern. i i t j l BRUNSWICYs - UNIT 2 3/4 6-19 Amendment No. JD94. - ~.-

i-_ _ ~ 7.< u; j[ CONTAINMENT SYSTEMS ji, BASES j l 3/4.6.3 PRlHARY CONTAINMENT I SOLATION V ALVES (Continued ) A list of automatic closing primt cy containment isolation valves and their associated closure times shall be available at the. plant in accordance with Section 50.71(c) ot-10 CFR Part 50. The addition and deletion of primary containment isolation valves shall be made in accordance with Section 50.59 of 10 CFR Part 50. l 3/4.6.4 VACUUM RELIEF Vacuum relief breakers are provided to equalize the pressure between the drywell and suppression pool and the suppression pool and reactor building, This system will maintain the structural integrity of the containment under conditions of large differential pressures. The vacuum breakers between the drywell and the suppression pool must not be inoperable in the open position since this would allow bypassing of the suppression pool in case of an accident. There are an adequate number of valves to provide some redundancy so that operat ion may continue with no more than 2 vacuum breakers inoperable and secured in the closed position. --1P IwsERT CAbched) Each set of vacuum relief valves between the suppression chamber and reactor k building provides 100% relief, which may be required in the unlikely event that neg*tive pressures develop'in the primary containment. The Nitrogen Backup System provides backup motive power for these suppression air. The. normal pool-reactor building vacuum breakers on a loss of instrument non-interruptibl e inst rument air system f or these' vacuum breakers is designed as a Seismic Cleis 1 sys tem supplied by ai r compressors ' powered 't rom the l-emergency buses. The Nitrogen System serves as a backup to the air system and f thus the loss of the Nitrogen System, or portions thereof, does not make the l vacuum breakers inoperable. This design allows for the out of service times l in Actions b and c. The Nitrogen Backup System is added to the Suppression Pool-Reactor Building Vacuum Breaker specification to satisfy NRC concerns relative to 10 CFR 50.44(c)(3) as addressed in the Brunswick Safety Evaluation Report dated October 30, 1986 concerning Generic Letter 64-09. Pressurization to 1130 psig assures sufficient system capacity to provide 24 hours -of operation with design valve actuation and system leakage. i 3/4.6.5 SECONDARY CONTAINMENT Secondary containment is designed to minimize any ground level release of-radioactive material which may result from an accident. The reactor building-provides secondary containment during normal operation when the drywell is i-sealed and in service. When the reactor is shut down or during refueling the drywell may be open and the reactor building then becomes the primary containment. 1 BRUNSWICK - UNIT 2 B 3/4 6-5 Amendment No.jk?F'm l t i

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The 14 day frequency stated in Specification 3.6.4.1, ACTION c and Specification 4.6.4.1 is based on engineering judgement, is considered adequate in view of other indications of vacuum breaker status available to operations personnel, and has been shown to be acceptable through operational experience. 1 .) l 1 1 J l l l l l 1. lt-__-____-___-___--_-___-_-______--______-_-____--_-____-_-_-_-___-__-

_e l ENCLOSURE 7 l BRUNSWICK STEAM ELECTRIC PLANT, UNIT 1 AND 2 l NRC DOCKETS 50-325 AND 50-324 l OPERATING LICENSES DPR-71 AND DPR-62 l REQUEST FOR LICENSE AMENDMENT i DRYWELL-SUPPRESSION CHAMBER VACUUM BREAKERS l l TYPED TECHNICAL SPECIFICATION PAGES - UNIT 1 I l f i l I

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~ CONTAINMENT SYSTEMS 3/4.6.4 VACUUM RELIEF DRYWELL - SUPPRESSION CHAMBER VACUUM BREAKERS LIMITING CONDITION FOR OPERATION 3.6.4.1 All drywell-suppression chamber vacuum breakers shall be OPERABLE and in the closed position with: a. The position indicator OPERABLE. and b. An opening setpoint of less than or equal to 0.5 psid. APPLICABILITY: OPERATIONAL CONDITIONS 1. 2 and 3. ACTION: a. With no more than 2 drywell-suppression chamber vacuum breakers inoperable for opening but known to be in the: closed' position, the provisions of Specification ~3.0.4 are not applicable and operation may continue until the next COLD SHUTDOWN provided the surveillance requirements of Specification 4.6.4.1.b are performed I. on the OPERABLE vacuum breakers within 4 hours and at'least once per 15 days thereafter, until the inoperable vacuum breakers are restored to OPERABLE status: otherwise, be in at least HOT SHUTDOWN within the next 12 hours and in COLD SHUTDOWN within the following 24 hours. b. With one drywell-suppression chamber vacuum breaker in the open position, as indicated by the position indicating system, the provisions of Specification 3.0.4 are not applicable and operation may continue provided the surveillance requirements of Specification 4.6.41.b are performed on the OPERABLE vacuum I breakers and the surveillance requirements of Specification 4.6.4.1.c are performed within 8 hours and at least once per 72 I hours thereafter until the inoperable vacuum breaker is restored to the closed position: otherwise. be in at least HOT SHUTDOWN within the next 12 hours and in COLD SHUTDOWN within the following 24 hours. c. With the position indicator of any drywell-suppression chamber vacuum breaker inoperable. the provisions of Specification 3.0.4 are not applicable and operation may continue, provided the surveillance requirements of Specification 4.6.4.1.c are performed I within 8 hour; and at least once per 14 days thereafter ~until the I inoperable Jos' tion indicator is returned to OPERABLE status:. otherwise. Je in at least HOT SHUTDOWN within the next 12 hours and in COLD S'OTDOWN within the following 24 hours. BRUNSWICK - UNIT 1 3/4 6-18 Amendment No.

1 .p CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS 4.6.4.1 Each drywell-suppression chamber vacuum breaker shall be demonstrated OPERABLE: a. At least once per 14 days and within 2 hours after any discharge. of steam to the suppression chamber from any source, verify each vacuum breaker is closed as indicated by the position indicating system. b. At least once per 31 days and after any discharge of steam to the I suppression chamber from any source, by exercising each vacuum breaker through one complete cycle and verifying that each vacuum breaker is closed as indicated by the position indication system, c. Whenever a vacuum breaker.is in the open position. as indicated by I the position indication system by conducting a test that verifies that the differential pressure is maintained greater than 1/2 the initial delta P for one hour without N makeup. 2 d. -At least once per 18 months during shutdown by: 1 1. Verifying the opening setpoint. from the closed position, to be less than or equal to 0.5 psid. 2. Performance of a CHANNEL CALIBRATION that each position indicator indicates the vacuum breaker to be open-if the vacuum breaker does not satisfy the delta P test in 4.6.4.1.c. l BRUNSWICK - UNIT 1 3/4 6-19 Amendment No.

.m 1 CONTAINMENT SYSTEMS BASES 3/4 6.3 PRIMARY CONTAINMENT ISOLATION VALVES (CONTINUED) 1 A list of automatic closing primary containment isolation valves and their associated closure times shall be available at the plant in accordance with i Section 50.71(c) of 10 CFR Part 50. The addition and deletion or primary containment isolation valves shall be made in accordance with Section 50.59 of 10 CFR Part 50. 3/4.6.4 VACUUM RELIEF 1 Vacuum relief breakers are provided to equalize the pressure between the. 4 drywell and suppression pool and the suppression pool and reactor building. 4 This system will maintain the structural integrity of the containment under conditions of large differential pressures. a i The vacuum breakers between the drywell and the suppression pool must not be inoperab]e in the open position since this would allow bypassing of the i suppression pool in case of an accident. There are an adequate number of valves to provide some redundancy so that operation may continue with no more than 2 vacuum breakers ineperable and secured in the closed position. The 14 day frequency stated in Specification 3.6.4.1. ACTION c and Specification 4.6.4.1 is based on engineering judgment, is considered adequate in view of other indications of vacuum breaker status available to operations personnel, and has been shown to be acceptable through operational experience. l Each set of vacuum relief valves between the suppression chamber and reactor i building provides 100% relief, which may be required in the unlikely event j that negative pressures develop in the primary containment. ] The Nitrogen Backup System provides backup motive power for these sup3ression pool-reactor building vacuum breakers on a loss of instrument air. T1e normal l non-interruptible instrument air system for these vacuum breakers is designed as a Seismic Class I system supplied by air compressors powered from the emergency buses. The Nitrogen System serves as a backup to the air system and 1 thus the loss of the Nitrogen System, or portions thereof. does not make the i vacuum breakers inoperable. This design allows for the out of service times j in Actions b and c. The Nitrogen Backup System is added to the Suppression Pool-Reactor Building Vacuum Breaker specification to satisfy NRC concerns i relative to 10 CFR 50.44(c)(3) as addressed in the Brunswick Safety Evaluation Report dated October 30. 1986 concerning Generic Letter 84-09. Pressurization to 1130 psig assures sufficient system capacity to provide 24 hours of operation with design valve actuation and system leakage. 3/4.6.5 SECONDARY CONTAINMENT Secondary containment is designed to minimize any ground level release of radioactive material which may result from an accident. The reactor building provides secondary containment during normal operation when the drywell is j sealed and in service. When the reactor is shut down or during refueling the drywell may be open and the reactor building then becomes the primary containment. j I BRUNSWICK - UNIT 1 B 3/4 6-5 Amendment No. ]

,..... ~.,.. u ..~.~.u.-. a. . -~. . +,. ) ,r ~ I i i ENCLOSURE 8 BRUNSWICK STEAM ELECTRIC PLANT, UNIT'1 AND 2 NRC DOCKETS 50-325 AND 50-324 ' OPERATING LICENSES DPR-71 AND DPR-62 REQUEST FOR LICENSE AMENDMENT-DRYWELL-SUPPRESSION CHAMBER VACUUM BREAKERS TYPED TECHNICAL SPECIFICATION PAGES - UNIT-2 i i . I I i 6 I l c .l ) I I

CONTAINMENT SYSTEMS 3/4.6.4 VACUUM RELIEF ] DRYWELL - SUPPRESSION CHAMBER VACUUM BREAKERS l LIMITING CONDITION FOR OPERATION 3.6.4.1 All drywell-suppression chamber. vacuum breakers shall be OPERABLE and in the closed position with: 3 a. The. position indicator OPERABLE, and b. An opening setpoint of less than or equal.to 0.5 psid. APPLICABILITY: OPERATIONAL CONDITIONS 1. 2., and 3. i i l ACTION: -a. With no more than 2 drywell-suppression chamber vacuum breakers ~ inoperable for opening but known to be in the closed position. the provisions of Specification 3.0.4 are not applicable and operation may continue until the next COLD SHUTDOWN provided the surveillance requirements of Specification 4.6.4.1.b-are' performed I on the OPERABLE vacuum breakers within 4 hours and at least once-per 15 days thereafter until the inoperable vacuum breakers are restored to OPERABLE status; otherwise. be in at least HOT SHUTDOWN within the next 12 hours and in COLD SHUTDOWN within the following 24 hours. b. With one drywell-suppression chamber. vacuum breaker in.the open position, as indicated by the position indicating system, the provisions of Specification 3.0.4 are not. applicable and operation may continue provided the surveillance-requirements of Specification 4.6.4.1.b are performed on the OPERABLE vacuum i breakers and the surveillance requirements of Specification i 4.6.4.1.c are performed within 8 hours and at least once per 72 l hours thereafter until the inoperable vacuum breaker is restored to the closed position; otherwise, be in at least HOT SHUTDOWN i within the next 12 hours and in COLD. SHUTDOWN within the following 24 hours. l With the position indicator of any drywell-sukpecification-3.0.4 pression chamber c. vacuum' breaker inoperable, the provisions of are not applicable and operation may continue provided the i r surveillance requirements of Specification 4.6.4.1.c are performed I within 8 hours and at least once per 14 days hours thereafter l until the inoperable position indicator is returned to OPERABLE status; otherwise, be in at least HOT SHUTDOWN within the next 12 L hours and in COLD SHUTDOWN within the following 24 hours. BRUNSWICK - UNIT 2 3/4 6-18 Amendment No. -n v y 9 3.,- g g.. ww---

. ), CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS 4.6.4.1 Each drywell-suppression chamber vacuum breaker shall be demonstrated OPERABLE: a. At least once per 14 days and within 2 hours after any discharge of steam to the suppression chamber from any source, verify each vacuum breaker is closed a_ indicated by the position indicating system. b. At least once per 31 days and after any discharge of steam to the I suppression chamber from any source, by exercising each vacuum breaker through one complete cycle and verifying that each vacuum breaker is closed as indicated by the position indication system. c. Whenever a vacuum breaker is in the open position, as indicated by I the position indication system, by conducting a test that verifies that the differential pressure is maintained greater than 1/2 the initial delta P for one hour without N makeup. 2 d. At least once per 18 months during shutdown by: I 1. Verifying the opening setpoint, from the closed position, to be less than or equal to 0.5 psid, 2. Performance of a CHANNEL CALIBRATION that each position indicator indicates the vacuum breaker to be open if the vacuum breaker does not satisfy the delta P test in 4.6.4.1.c. I l i I i i l i BRUNSWICK - UNIT 2 3/4 6-19 Amendment No.

l ..r CONTAINMENT SYSTEMS BASES 3/4.6.3 PRIMARY CONTAINMENT ISOLATION VALVES (Continued) A list of automatic closing primary containment isolation valves and their associated closure times shall be available at the plant in accordance with Section 50.71(c) of 10 CFR Part 50. The addition and deletion of primary containment isolation valves shall be made in accordance with Section 50.59 of. 10 CFR Part 50. 3/4.6.4 VACUUM RELIEF Vacuum relief breakers are provided to equalize the pressure between the drywell and suppression pool and the suppression pool and reactor building. This system will maintain the structural integrity of the containment under conditions of large differential pressures. The vacuum breakers between the drywell and the suppression pool must not be inoperable in the open position since this would allow bypassing of the suppression pool in case of an accident. There are an adequate number of-valves to provide some redundancy so that operation may continue with no more than 2 vacuum breakers inoperable and secured in the closed position. The 14 day frequency stated in Specification 3.6.4.1. ACTION c and Specification 4.6.4.1 is based on engineering judgment. is considered adequate in view of other indications of vacuum breaker status available to operations personnel, and has been shown to be acceptable through operational experience. Each set of vacuum relief valves between the suppression chamber and reactor building provides 100% relief, which may be required in the unlikely event that negative pressures develop in the primary containment. The Nitrogen Backup System provides backup motive power for these sup]ression pool-reactor building vacuum breakers on a loss of instrument air. T1e normal j non-interruptible instrument air system for these vacuum breakers is designed as a Seismic Class I system supplied by air compressors powered from the emergency buses. The Nitrogen System serves as a backup to the air system and thus the loss of the Nitrogen System. or portions thereof. does not make the vacuum breakers inoperable. This design allows for the out of service times in Actions b and c. The Nitrogen Backup System is added to the Suppression Pool-Reactor Building Vacuum Breaker specification to satisfy NRC concerns relative to 10 CFR 50.44(c)(3) as addressed in the Brunswick Safety Evaluation Report dated October 30. 1986 concerning Generic Letter 84-09. Pressurization to 1130 psig assures sufficient system capacity to provide 24 hours of operation with design valve actuation and system leakage. 3/4.6.5 SECONDARY CONTAINMENT Secondary containment is designed to minimize any ground level release of radioactive material which may result from an accident. The reactor building provides secondary containment during normal operation when the drywell is sealed and in service. When the reactor is shut down or during refueling the drywell may be open and the reactor building then becomes the primary containment. BRUNSWICK - UNIT 2 B 3/4 6-5 Amendment No. . -}}

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