ML20207G520

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Proposed Tech Specs Combining Drywell Vacuum Relief Requirements w/post-LOCA & Combustible Gas Purge Sys Into One Tech Spec
ML20207G520
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 07/16/1986
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20207G509 List:
References
TAC-60587, TAC-60588, TAC-60589, TAC-60590, TAC-60591, TAC-60592, NUDOCS 8607230088
Download: ML20207G520 (9)
v • d • e


Text

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I INDEX t

LIMITING CONDITIONS FOR OPERATION AND SURVEILLANCE REQUIREMENTS SECTION PAGE CONTAINMENT SYSTEMS (Continued)

RELIEF 3/4.6.5 DRYWELL ,"0ST LOCA VACUUM -99fA$MNMr. . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 6-46 3/4.6.6 SECONDARY CONTAINMENT Secondary Containment Integrity............................ 3/4 6-48 Secondary Containment Automatic Isolation Dam Valves.......................................pers/ .............. 3/4 6-49 Standby Gas Treatment System...............................

3/4 6-55 3/4.6.7 ATMOSPHERE CONTROL Containment Hydrogen Recombiner Sys tems. . . . . . . . . . . . . . . . . . . . 3/4 6-58 Containment and Drywell Hydrogen Ignition System........... 3/4 G-59 Combustible Gas Control Purge System....................... 3/4 6-66 3/4.7 PLANT SYSTEMS 3/4.7.1 SERVICE WATER SYSTEMS Standby Servi ce Wa te r Sys tem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 7-1 i High Pressure Core Spray Service Water System.............. 3/4 7-3 Ultimate Heat Sink......................................... 3/4 7-4 3/4.7.2 CONTROL ROOM EMERGENCY FILTRATION SYSTEM...................

J 3/4 7-7 3/4.7.4 SNUBBERS..................................,................ 3/4 7-9 3/4.7.5 SEALED SOURCE CONTAMINATION................................ 3/4 7-15 3/4.7.6 FIRE SUPPRESSION SYSTEMS Fire Suppression Water System.............................. 3/4 7-17 Spray and/or Sprinkler Systems............................. 3/4 7-20 CO 2 Systems................................................

3/4 7-22 Halon Systems.............................................. 3/4 7-24 Fire Hose Stations......................................... 3/4 7-25 Yard Fire Hydrants and Hydrant Hose Houses................. 3/4 7-28 8607230088 860716 PDR P ADOCK 05000416 PDR GRAND GULF-UNIT 1 viii [V v* e n)<m e r1~ Ab.

4 INDEX

_B4SES SECTION PAGE i

3/4.5 EMERGENCY CORE COOLING SYSTEM i 3/4.5.1/2 ECCS - OPERATING and SHUTD0WN...................... B 3/4 5-1 i 3/4.5.3 SUPPRESSION P00L................................... B 3/4 5-2

) 3/4.6 CONTAINMENT SYSTEMS j 3/4.6.1 PRIMARY CONTAINMENT Primary Containment Integrity...................... B 3/4 6-1

Containment Leakage................................ B 3/4 6-1
Containment Air Locks.............................. B 3/4 6-1 4

MSIV Leakage Control System........................ B 3/4 6-1 Feedwater Leakage Control System................... B 3/4 6-2 u

Containment Structural Integrity................... B 3/4 6-2 Containment Internal Pressure...................... B 3/4 6-2 Containment Average Air Temperature................ B 3/4 6-2 Containment Purge System........................... B 3/4 6-2 3/4.6.2 ORYWELL

Drywell Integrity.................................. B 3/4 6-3 l Orywell Bypass Leakage............................. B 3/4 6-3 l D rywe l l A i r Lo c k s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B 3/4 6-3

! Drywei l Structural Integri ty. . . . . . . . . . . . . . . . . . . . . . . B 3/4 6-4 Drywell Internal Pressure.......................... B 3/4 6-4 Drywell Average Air Temperature.................... S 3/4 6-4 f Drywell Vent and Purge............................. B 3/4 6-4 3/4.6.3 DEPRESSURIZATION SYSTEMS........................... S 3/4 6-4 3/4.6.4 CONTAINMENT AND DRYWELL ISOLATION VALVES........... 8 3/4 6-7

3/4.6.5 MbHf DRYWELL "0ST LOCA VACUUM ununnmRS.................. B 3/4 6-7 3/4.6.6 SECONCARY CONTAINMENT.............................. B 3/4 6-8
3/4.6.7 ATMOSPHERE CONTR0L................................. B 3/4 6-9 i,

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GRAND GUI.F-UNIT 1 xiv %Mg flo.

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i CONTAINMENT SYSTEMS gagl a a M Ti AAdeE bh% l

! 3/4.6.5 DRYWELL ^^" ' ^" VACUUM """"'"" RELT E F <;

LIMITING CONDITION FOR OPERATION _ i h5 All drywell post-LOCA vacuum breakers shall be OPER W.E and closed. [

APPLI BILITY: OPERATIONAL CONDITIONS 1, 2 and 3.

ACTION:

t. With on drywellpost-LOCAvacuumbreakerinoperableforopcnIgbutknosn to be clo d, restore the inoperable vacuum breaker to OPER E status

, within 72 h rs or be in at least HOT SHUTCOWN within the ext 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />  !

and in COLD 5 'TDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. ,

I

b. With one drywell ost-LOCA vacuum breaker open, rest e the open vacuum  !

breaker to the clohqd position within 1 haur or oe, n at least liOT SHUT- '

  • DOWN within the next 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and in COLD S110T00Wwithin 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 indicat of an OPERABLE wil post-LOCA vacuum breaker .

inoperable, verify the vacu breaker to . closed at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by local indication. O erwise @ are the vacuum breaker inoperable .

(See Note 1)

.iURVEILLANCE REQUIREMENTS / ,

! N 4.6.5 Each drywell post-LOCA va sum breaker i be; i a. Verified closed at least nce per 7 days.

i b. Demonstrated OPERABLE-At least once fer 31 days by:

1. l l

l a) Cyclin the vacuum breaker and isolation vh

~

at I st one complete cycle of full travel.{ve(s) through

! b) V ifying the position indicator OPERABLE by ob erving expected alve movement during the cycling test. (Sec No ' 1)  ;

l 2. AtIeastonceper18monthsby:

Verifying the pressure differential required to open e vacuum breaker, from the closed position, to be less th,

]

l t

/

/ b) or equal to 1.0 psid, and (See Note 1)

Verifying the position indicator OPERABLE by performance of CHANNEL CALIBRATION. (See Note 1)

A i

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GRAND GULF-L. 1 3/4 6-46 *

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CONTAINMENT SYSTEMS 3/4.6.5 DRYWELL VACUUM RELIEF LIMITING CONDITION FOR OPERATION 3.6.5 Both drywell post-LOCA vacuum relief subsystems and both drywell -

purge vacuum relief subsystems shall be OPERABLE with associated vacuum breakers and isolation valves closed.

! APPLICABILITY: OPERATIONAL CONDITIONS 1, 2 and 3 t

i ACTION:

l a. With one of the drywell post-LOCA vacuum relief subsystems and/or one of the drywell purge vacuum relief subsystems inoperable for opening but -

known to be closed, restore the inoperable subsystem (s) to OPERABLE status within 30 days or 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 />. ,

b. With two of the post-LOCA vacuum relief subsystems inoperable for opening '

but known to be closed, provided that both of the drywell purge vacuum relief subsystems are OPERABLE, restore the inoperable subsystems to -

4 OPERABLE status within 30 days or be in at least HOT SHUTD0WN 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 />.

c. With two of the post-LOCA vacuum relief subsystems ano one of the drywell purge vacuum relief subsystems inoperable for opening but known to be
closed, restore one inoperable subsystem to 0FERABLE 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 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 SHU1DOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

l d. With one of the drywell isolation vacuum breakers open, restore the open vacuum becaker to the closed position within I hour or be in at least H0T 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 followir.g 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. l l

e. With the position indicator of an OPERABLE drywell vacuum breaker or '

associated isolation valve of the drywell vacuum relief subsystems inoperable, verify the vacuum breaker or isolation valve to be closed at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by local indication. Otherwise be in at least HOT SMUTDOWN 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 2^ hours.

S9RVEILLANCE_RE,(UIREMENTS l

I 4.6.5 Each oost-LOCA and purge cystem vacuum breaker and associated isolation valve shall be:

a. Verified closed at least once per 7 days, i

. GRAND GULF-UNIT 1 3/4 6-46 Amendment No.

J10ATT86062401 - 8 l

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CONTAINMENT SYSTEMS ,

g ggy g SURVEILLANCE REQUIREMENTS (Continued)

3. By verifying the OPERABILITY of the vacuum breaker isolation valve differential pressure actuation instrumentation with the opening setpoint of -1.0 to 0.0 psid (Drywell minus Containmen by performance of a: -

a) CHANNEL CHECK at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, b) NNEL FUNCTIONAL TEST at least once per 31 day , and c) CHAN L CALIBRATION at least once per 18 mon s.

s -

Idote 1: Until restart af ter e first refuelin utage, the following requirements shall app ':

L 6. 5

<:. With the position indicator of an RABLE drywell post-LOCA isolation valve for a vacuum breaker inoper le verify the isolation valve to be closed at least once per 24 ho s by lo 1 indication. Otherwise declare the isolation valve inoperabl .

4.6.5.b.1

h. Verifying the positio indicator for the vacuum eaker isolation valve OPERABLE by observi expected valve movement duri the cycling test.

4.6.5.b.2 dt least once per 8 months by:

a) Verifying the pressure differential required to open he vacuum breaker, from the closed position, to be less than or ual to 1.0 psid, and b) Verifying the position indicator for the vacuum breaker iso tion valve OPERABLE by performance of a CHANNEL CALIBRATION.

GRAND GULF-UNIT 1 3/4 6-47 s > ,

)

CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (continued)

b. Demonstrated OPERABLE: ,

1

1. At least once per 31 days by:
a) Cycling the vacuum breaker and associated isolation valve through at least one complete cycle of full travel. ,

b) Verifying the position indicators OPERABLE by observing expected vacuum breaker and associated isolation valve movements during the cycling test.

At least once per 18 months by:  ;

2.

a' a) Verifying the pressure differential required to open the vacuum breaker, from the closed position, to be less than or equal to 1.0 psid, and  ;

! b) Verifying the position indicators of the vacuum breaker and j associated isolation valve OPERABLE by performance of CHANNEL j CALIBRATIONS.

i

! 3. By verifying the OPERABILITY of the isolation valve differential j pressure actuation instrumentation with the opening setpoint of 0.0

to 1.0 psid for the drywell purge subsystems and -1.0 to 0.0 psid for
the post-LOCA vacuum relief subsystems (Drywell minus Containment) by performance of a:
a) CHANNEL CHECK at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, i

b) CHANNEL FUNCTIONAL TEST at least once per 31 days, and ,

! c) CHANNEL CALIBRATION at least once per 18 months.

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GRAND GULF-UNIT 1 3/4 6-47 Amendment No.

I J10ATT86062401 - 9

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CONTAINMENT SYSTEMS BASES 3/4.6.4 CONTAINMENT AND DRYWELL ISOLATION VALVES The OPERABILITY of the containment isolation valves ensures that the con-tainment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressuri-zation of the containment and is consistent with the requirements of GDC 54 through 57 of Appendix A to 10 CFR Part 50. Containment isolation within the time limits specified for those isolation valves designed to close automatically ensures that the release of radioactive material to the environment will be -

consistent with the assumptions used in the analyses for a LOCA.

The operability of the drywell isolation valves ensures that the drywell atmosphere will be directed to the suppression pool for the full spectrt.m of pipe breaks inside the drywell, Since the allowable value of drywell leakage is so large, individual drywell penetration leakage is not measuted. By checking valve operability on any penetration @ich could contribute a large fraction of the design leakage, the total leakage is maintained at less than the design value.

Table 3.6.4-1 lists the Containment and Drywell Isolation Valves in four sections. Section 1 contains the Automatic I,olation Valves which are those valves that receive an automatic isolation signal from Table 3.3.2-1 instrumen- '

tation and are. located on the Containment or Drywell penetrations. The vatvss included in Section 2 are Manual Isolation Valves which receive a remote manual signal from a handswitch and are located on the Containment or Drywell Penetrations,.

  • Some of the valves in Section 2 may receive automatic signals, but not automatic isolation signals from instrumentation in Table 3.3.2-1. The valves included in Section 3 are those which do not receive isolation signals from instrumentation lised in Table 3.3.2-1 and do not utilize a remote manual handswitch. Section 3 includes check valves, local manual operated valves and power operated valves that do not utilize a handswitch. Section 4 of Table 3.6.4-1 contains test connection valves.

The maximum isolation times for containment and drywell automatic isolation -

valves are the times used in the FSAR accident analysis for valves with analyt-ical closing times. For automatic isolation valves not having analytical closing times, closing times are derived by applying margins to previous valve closing test data obtained by using ASME Section XI criteria. Maximum closing l times for these valves was determined by using a factor of two times the allow-able (from previous test closure to next test closure) ASME Section XI margin and adding this to the previous test closure time. .

RELEEF l 3/4.6.5 DRYWELL ^02 LOCA VACUUM ORE *MEM i Sc. A&c.6) .hrert vacuum in the ry nden 1 ment air is dr um, rea e he two branches l

1 GRAND GULF-UNIT 1 B 3/4 6-7 A m b o r No.

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_CO.N.TAIMENT S* STEMS, ,

835E5 _

REU EF  :

O_RY_WILJ +W49% VACUUM CZ?"EPS (Contirs:ed) g g y-

w e m . di_c W ged inc. " amin-cel i e f
  • i + ictes --c' .' c MJerenti P i pres . t one psi. This vactum "elief, in conjunction with the re d ywell purg :m, 'is necessary to insare [. hat tfe pcst'l M 'ywell H.1 '

concentratica does .u ee,d 4% b) vol trna. j 3  %

Follo.<ing :/acuurr. reliet . tia de urge sy.cn: pressurizes the urywell, '

forcirg Lonccndensit les 4.hrough. . e horize:1ta i ts and into the containment at a rate designed ,to.sastit7n the 112 concentratir.n ne (16mrWble ilmits.

jW"sIe' two 100% vacuu;n reliraf system; so that t* e pla i

<,~_ .:ti ^ .-i th =^ p t= cu t o f m ; n %:.1 !H tJ m i ud ;fo ine.

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, 3/4.6.6 SECONDARY CONTAINMENT t

Secondary containthent is designed r.o mf nitaire eny ground level releate of radioactive materid1 whict,may result from an accioent. Tilf Aux' liory Building and Enclosure Building provide seco
dary containment ouring normal operatior, .

when tRe containtrFit is se31 ed and ir, service. Wher. the re.'ctor b i1 COLO SHUTDOWN (r REPJELING, the containment itay be open and ".'ac Auxiliacy Building and Enclosure Buildirg tnen beccme t119 only containment.

1 i j Ttl e maximtm isolation tices for secondary containment automatic isol:rtion

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4 damper.s/ valves are the times used irl the FSAR acc;.Jent analysis for dampers /

valves with analytical riesing times. For autom: tic isolat:cn valves not having i analytical closing times, closing tire 5 are d;; rives by appiping 7nrgir.s to k l previous valve closing test data obtained t*y if3Jr'] /iSME 5enion XI tr)teria.

l Maximum closing times for these valves was determ.nd_d by usirg a fictLSr of *.wo 1

times the allowable (from pretious test cloa re te r. ext tes+ closure) ASME i

Section XI margin and adding thi3 to the p eviou:; test closure tias.  ;

i j Establishing ar,d maintaining a varum ir t h Auxiliary Daildire and i l Enclosure Building witti tne standby cas treatmut system ance por 13 rnorths, t i along with the sur.teillance of the doors, latches, dampe&s, valves , blir d

! flanges, and rupture discs is adequate to erasure that there are 10 vjolations i of the integrity of the secondary containment.

l l The OPERABILITY of the standt>y gas trette nt systems ensures that sufficient l 4 iodine removal capability will be aseilable i/1 the e ent of a LOSA. The reduction

! in containrent iodine inventory reduces the resultir:p tite W nd&y radiatior) '

i doses associated with contair, ment lutko2e. The operwion of this system and i resultant iodine removal capacity are consistent witn the assumptions used iri

the LOCA analyses. Continuous operatico of the system with tr'e heaters CPERABLE for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> over a 31-day period is sufficient tb reduce the buildup of moistur,a on the cdsorbers and HEPA filters.

t GRAND GULF-UNIT 1 B 3/4 6-8 br eMe 8 M#- '

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,,._m_______ _ - . _ , _ . _ _ _ _ _ _ _ _ _ - . ,_,.,__.-,__.._,..__.--.___,___,.-m._ _

_.._,.._.,,___,_,_,_--_,m.v-__~---

f .

(Insert for Bases Pages 83/4 6-7 and 6-8)

BASES 3/4.6.5 DRYWELL VACUUM RELIEF The safety related functions of the four drywell vacuum relief subsystems are drywell isolation, proper operation of the drywell purge compressors and OPERABILITY in a large break LOCA to control weir wall overflow drag and impact '

loads. The drywell isolation and drywell purge OPERABILITY functions are discussed in Bases 3/4.6.4 and 3/4.6.7, respectively. Drywell vacuum relief is ^

not required for hydrogen dilution or to protect drywell structural integrity in a design baris accident.

To provide drywell vacuum relief, containment air is drawn through subsystems associated with three 10 inch lines penetrating the drywell. Two drywell post-LOCA vacuum relief subsystems are in a parallel arrangement co,nected to one of the three 10 inch vacuum relief lines penetrating the drywell. Each drywell post-LOCA vacuum relief subsystem consists of a motor operated isolation valve in series with a check valve. OPERABILITY of either drywell post-LOCA vacuum relief subsystem assures OPERABILITY of the associated 10 inch ,

vacuum relief line penetrating the drywell. Each of the two remaining 10 inch vacuum relief lines penetrating the drywell contains a drywell purge vacuum relief subsystem. Each drywell purge vacuum relief subsystem consists of a series arrangement of a motor operated isolation valve and two check valves.

Vacuum relief initiates at a differential pressure across the check valves of i

one psi.

I Rapid weir wall overflow in a large break LOCA could cause drag and impact i loadings to essential equipment and systems in the drywell above the weir wall.

Drywell negative pressure analysis for rapid weir walljverflow in a large

, break LOCA assumes a vacuum breaker capability O' A/ JK = 0.38 ft.2 thus ,

requiring a minimum of two 10 inch drywell vacuum relief paths.

l OFIRABILITY requirements for the four drywell vacuum relief subsystems in

relationship to continued plant operation are based on maintaining at least two l of the three 10 inch drywell vacuum relief paths OPERABLE. However, to ensure '

! that essential equipment is returned to service in a timely manner, continued l plant operation is limited with only one 10 inch drywell vacuum relief line out 1

of service. Plant operation is further limited when two of the three 10 inch

ifnes are out of service to ensure prompt response to restore equipment to service or to place the plant in a condition where the equipment is not required. Plant operation is also limited with a drywell isolation vacuum breaker in the open position in order to help assure that design drywell bypass ,

leakage is not potentially exceeded. Position indication is required to be OPERABLE on all drywell vacuum breakers and motor operated isolation valves to

, help identify potential drywell bypass leakage paths, i

l Surveillance requirements and intervals were chosen to reflect the importance l l associated with the drywell vacuum relief function and are based on good l l

engineering judgement using previous accepted testing methods. '

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! l l J10ATT86062401 - 10 i

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