ML20045H713

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Proposed TS 3.6.7.2 Re Containment & Drywell Hydrogen Ignition Sys & Deleted TS Table 3.6.7.2-1 Re Hydrogen Igniter Circuits
ML20045H713
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 07/14/1993
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20045H712 List:
References
NUDOCS 9307210169
Download: ML20045H713 (15)
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Pace Table Sub.iect 3/4 6-61 3.6.7.2-1 Hydrogen' Igniter Circuits 3/4 6-62 3.6.7.2-2 Hydrogen Igniters and Location 3/4 6-63 3.6.7.2-2 Hydrogen Igniters (cont'd) and Location 3/4 6-64 3.6.7.2-2 Hydrogen Igniters (cont'd) and Location 3/4 6-65 4.6.7.2-1 Number of Igniters by Circuit i

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.- Page 1 of 9 CONTAINMENT SYSTEMS  !

CONTAINMENT AND DRYWELL HYDR 0 GEN IGNITION SYSTEM l

LIMITING CONDITION FOR OPERATION j 3.6.7.2 The containment and drywell hydrogen ignition system consisting of l the fcllcuing:0 ha o igniter assemblies in each enclosed area specified in Table 3.6.7. ,

b. All igniter assemblies adjacent to any inop iter assembly in each open area specified in Table 3.6.7.2-2, and 3

$ seTwo independent containment and drywell hydrogen ignition subsystemsF ac consistino ofatwo circuits (n 'isted ir. T:ble 3.5.7.21) with rc S cAc#

3 mnra than two igniter assemblies inoperable p dr-"" ^

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shall be OPERABLE.

3JM v APPLICABILITY: OPERATIONAL CONDITIONS 1 and 2 ACTION:

a. th less than two igniter assemblies OPERABLE in any enclosed area speci in Table 3.6.7.2-2, restore at least two igniter assemblies to OPERABLE sta thin 7 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 />.
b. With any adjacent igniter assemblies an open area as specified in  !

Table 3.6.7.2-2 inoperable, restore the igni emblies in that open area so that all igniter assemblies adjacent to an in le igniter assembly'are OPERABLE within 7 days or be in at least HOT S within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

c. With one containment and drywell hydrogen ignition subsystem inoperable, restore the inoperable subsystem to OPERABLE status within days or be i 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 />. 3, _

SURVEILLANCE REQUIREMENTS 4.6.7.2 The containment an drywell hydrogen ignition system shall br demonstrated OPERABLE: i8a Ar W+.r cme

a. At least once pe ays by energizing the supply breakers an [
1. Verifying a visible ulce trem the olow plug tip of each normally accessible igniter assembly specified in taoie 3.C.7.2-?,

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performing current / voltage measurements of each circuit. If more than 3 of the included igniter assemblies of either subsystem are determined to be inoperable, increase the surveillance frequency to a 92-day interval until the condition no longer exists.

GRAND GULF-UNIT 1 3/4 6-59

', Attachment 3 to GNR0-93/00002 Page 2 of 9 CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

2. Verifying that each circuit of each containment and drywell hydrogen ignition subsystem is conducting sufficient current to rgize the minimum required number of igniter assemblies spec f4 d in Table 4.6.7.2-1.
b. At every COLD SHUTD '

but no more frequently than once per 92 days, by energizing the supply (brta ers and verifying a visible glow from the glow plug tip of each normal naccessible igniter assembly specified.

in Table 3.6.7.2-2.

c. At least once per 18 months by:
1. Verifying the cleanliness of each glow plug by visual inspection.
2. Energizing each glow plug and verifying a surface temperatur f at least 1700*F.

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b. At least once per 18 months, by energizing each glow plug and:
1. verifying a surface temperature of at least 1700*F for each of the accessible igniters, and
2. verifying by measurements sufficient current / voltage to develop 1700*F-surface temperature for thos igniter assemblies in inaccessible areas.

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- Page 3 of 9 TABLE 3.6.7.2-1 HYDROGEN IGNITER CIRCUITS DIVISION 1 DIVISION 2 CIRCUIT CIRCUIT 2 CIRCUIT 1 CIRCUIT 2 D124 0107 D125 D106 D126 D109 D127 D108 D128 D111 D129 D110 ,

D130 112 D136 D113 D132 4 D138 D115 D134 D11 D140 D117 D137 D119 D149 Dll8 D139 D121 D151 D120 ,

D141 D123 D153 D122 D143 D148 D161 D131 '

D145 0150 D162 D133 D147 D152 0165 0135 D155 D154 66 0142 D157 D159 D D144 D172 D160 D170 D146 0174 D163 0171 D156 D176 D164 D178 D158 D183 D167 D180 D173 i D192 D169 D182 D175 '

D185 D179 D187 D177 D186 D181 D189 184 '

D188 D191 D193 D 0 D194 D195 t

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TABLE 3.6.7.2-2 -

HYDR 0 GEN IGNITERS AND LOCATIONS DIST. FROM CENTERLINE ,

  • IGNITER DIV./ CIRCUIT ELEVATION AZIMUTH OF REACTOR NORMALLY AC _SSIBLE Open Areas Containment .

D124 I/1 136'-0" 21 57'-0" D125 11/1 132'-10" 47 53'-0" D126 I/1 132'-10" 75 51'-9" D127 11/1 132'-10" 107 51'-9"-

D128 I/l 132'-10" 135 51'-9" D129 11/1 132'-10" 165 51'-9" D130 I/I 132'-10" 195 51'-9" D131 II/2 45'-7" 220 60'-0" D132 I/l 1

-4" 253 51'-9"  ;

D133 II/2 134 -4" 285 51'-9" D134 I/1 134' "

317 52'-8" D135 11/2 136'-0' 349 51'-9" D137 I/I 160'-4" 36 53'-6" 157'-10" 51'-9" D138 11/1 70 D139 I/I 157'-10" 100 51'-9" D140 11/1 160'-4" 135 51'-2" <

D141 I/l 155'-10" 164 51'-9" D142 11/2 155'-10" 196 51'-9" D143 I/1 165'-0" 26 61'-4" 0144 II/2 160'-4" 0 54'-2" D145 I/l 159'-4" 28 51'-5" D146 II/2 159'-4" 321 51'-5" D148 I/2 182'-9" 30 61'-0" D149 11/1 167'-8" 41 42'-0" D154 I/2 182'-4" 136 51'-9" D155 I/l 182'-4" 254 55'-9" D156 II/2 183'-4" 274 48'-0" 0157 I/1 182'-4" 293 58'-11" D158 II/2 183'-4" 320 3'-2" D160 I/2 202'-0" 35 ' 0" 0161 11/1 207'-9" 59 44 -0" D170 11/1 207'-7" 135 55' "

D171 11/1 206'-0" 216 46'-9 D172 I/I 204'-11" 252 26'-0" D173 11/2 204'-4" 256 53'-8" D174 I/I 204'-11" 284 53'-8" D175 II/2 201'-11" 298 26'-8" i D176 I/l 207'-9" 310 56'-6" I l

  • System prefix is E61 for all igniters.

GRAND GULF-UNIT 1 3/4 6-62 1 1

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f DELETED Page 5 of 9 TABLE 3.6.7.2-2 (Continued)

HYDROGEN IGNITERS AND LOCATIONS DIST. FROM CENTERLINE

  • IGNIT DIV./ CIRCUIT ELEVATION AZIMUTH OF REACTOR i NORMALLY CESSIBLE (Continued)

Open Area Containment (Co tinued)

D178 II/ 262'-0" 6 55'-5" D179 I/2 262'-0" 48 55'-5" D180 11/1 262'-0" 91- 55'-0" i D181 I/2 262'-0" 140 55'-0" D182 II/1- 262'-0" 183 55'-0" D183 I/l 262'-0" 225 55'-0" D184 II/2 262'-0" 268 55'-0" D185 I/1 262'-0" 333 55'-0" D186 I/l 83'-10" 349 39'-9" D187 11/1 3'-10" 34 39'-9" D188 I/2 28 '-10 81 39'-9" D189 II/1 283 10" 127 39'-9" D190 I/2 283'- " 152 39'-9" D191 11/1 283'-l " 199 39'-9" D192 I/1 283'-10" 242 39'-9" ,

D193 II/2 283'-10" 286 39'-9" D194 11/2 295'-0" 349 15'-3" D195 I/2 295'-0" 158 15'-3" NORMALLY INACCESSIBLE Open Areas  ;

Drywell D106 11/2 146'-3" 0 26'-6" D107 I/2 145'-7" 63 29'-3" D108 II/2 146'-2" 120 29'-8" D109 I/2 147'-1" 180 26'-3" D110 11/2 145'-7" 240 29'-2" '

D111 1/2 145'-7" 313 5'-11" D112 I/2 160'-6" 0 2 '-4" Dll3 II/2 160'-6" 60 29 9" Dll4 I/2 160'-6" 135 27' "

D115 11/2 160'-6" 180 26'-l "

D116 I/2 160'-6" 232 26'-1" D117 II/2 160'-6" 324 26'-5" D118 II/2 179'-0" 0 26'-4" D119 I/2 179'-0" 65 26'-4" ,

D120 II/2 179'-0" 125 26'-4" D121 1/2 179'-0" 180 26'-4" D122 II/2 179'-0" 245 26'-4" D123 I/2 179'-0" 305 26'-4" N i

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DELETED Page 6 of 9 TABLE 3.6.7.2-2 (Continued)

HYDROGEN IGNITERS AND LOCATION.c DIST FROM CENTERLINE

  • IGNITE Q]V./ CIRCUIT ELEVATION AZir4Uit 0F REACTOR -

NORMALLY INA SSIBLE (Continued)  ;

Enclosed Areas Main Steam Tunnel D136 11/1 166'-0" 16 51'-9" ,

D147 I/1 166'-0" 344' 51'-9" RWCU Backwash Room D150 1/2 168'-10" 70 42'-0" D151 11/1 8'-10" 105 42'-0"  :

D152 I/2 1 ' 10" 70 46'-2" D153 11/1 178 10" 109 51'-5" RWCU Heat Exchanger Room D159 I/2 202'-0" 21 50'-4" D177 II/2 202'-0" 341 55'-0" Filter /Demineralizer Room D162 11/1 202'-0" 74 55'-8" D163 I/2 202'-0" 48'-0" D164 I/2 202'-0" 92 48'-0" D165 11/1 202'-0" 106 55'-8" RWCU Pump Area D166 11/1 202'-0" 93 45'-0" D167 I/2 202'-0" 86 37'-6" .

RWCU Sample Area '

D168 11/1 202'-0" 86 3 '-0" D169 I/2 202'-0" 96 22' -6" i

  • System prefix is E61 for all igniters.

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, Page 7 of 9 TABLE 4.6.7.2-1 NUMBER OF IGNITERS BY CIRCilll CIRCUIT HJNIMUM RE0VIRED TOTAL ON CIRCUIT Division I ,

Circuit 1 19 21  ;

Circuit 2 22 24 Division II Circuit 1 20 22 -

Circuit 2 21 23 a

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CONTAINMENT SYSTEMS BASES SECONDARY CONTAINMENT (Continued)

The. surveillance testing for verifying heat dissipation for. the Standby l Gas Treatment System heaters is performed in accordance with ANSI N510-1975 l with the exception of the 5% current phase balance criteria of Section 14.2.3. i The offsite power system for the Grand Gulf Nuclear Station consists of a non-  :

transpositional 500 Kv grid. The grid has an inherent unbalanced-load distribution which results in unbalanced voltages in the plant. . Voltage  :

unbalances exceeding the ANSI N510-1975 5% criteria are not atypical. For painting, fire and chemical releases other than carbon dioxide in any ,

ventilation zone communicating with the standby gas treatment system, the surveillance requirements are adequate to ensure charcoal absorbency is ,

maintained. A release of carbon dioxide for any reason other than a fire will not adversely affect the charcoal's absorbency and the surveillance requirement need not be performed.

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BASES -

3/4.6.7 ATMOSPHERE CONTROL The OPERABILITY of the systems required for the detection and control of-hydrogen gas ensures that these systems will be available to maintain the hydrogen concentration within the containment below the flammable limit during post-LOCA conditions. The drywell purge system in combination with the ,

hydrogen recombiner system is designed to control the hydrogen produced following a DBA LOCA. The hydrogen ignition system is used to control the excessive quantity of hydrogen during the unlikely occurrence of a degraded core accident. Both the hydrogen recombiner and the hydrogen ignition systems are capable of controlling the expected hydrogen generation associated with -

(1) zirconium-water reactions, (2) radiolytic decomposition of water, and (3) corrosion of metals within containment. l Two 100% capacity hydrogen recombiners are provided for the control of. .

hydrogen in the containment. Either recombiner is capable of maintaining the '

hydrogen concentration below the flammability limits following a DBA LOCA.

Two 100% drywell purge systems are the primary means of H2 control within the drywell. Either system is capable of purging hydrogen produced following a LOCA into the containment volume. Hydrogen generated from the metal-water .

reaction and radiolysis is assumed to evolve to the drywell atmosphere and form a homogeneous mixture through natural forces and mechanical turbulence '

(ECCS pipe break flow). The drywell purge system forces drywell atmosphere i through the horizontal vents and into the containment and as a result no ,

bypass path exists. The hydrogen control system is consistent with the ,

requirements of GDC 41, " Containment Atmosphere Cleanup" and the recommendations of Regulatory Guide 1.7, " Control of combustible Gas 1 Concentrations in Containment folicwing a LOCA," September 1976.

The primary containment and drywell hydrogen ignition system is a part of ,

the combustible gas control system required by 10 CFR 50.44 to reduce the hydrogen concentration in the primary containment following.a degraded core ,

accident. Ignitors are distributed throughout the primary containment and  ;

drywell. The OPERABILITY of at least 90% of igniter assemblies in either hydrogen ignition subsystem will maintain an effective coverage throughout the +

containment and drywell. Some areas may be categorized as inaccessible areas ..

due to high levels of radiation or personnel safety. Examples of inaccessible  !

areas include such enclosures as the heat exchanger, filter demineralizer, and the reactor water clean-up pump rooms. Special surveillance requirements are  :

provided for igniters located in inaccessible areas to reduce personnel i exposure and other safety concerns. A list of required hydrogen igniters is contained in applicable plant procedures by electrical division / circuit and >

physical location. ,

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<* Page 1 of 1 CONTAINMENT SYSTEMS CONTAINMENT AND DRYWELL HYDROGEN IGNITION SYSTEM LIMITING CONDITION FOR OPERATION 3.6.7.2 The containment and drywell hydrogen ignition system consisting of two independent containment and drywell hydrogen ignition subsystems shall be OPERABLE with each subsystem consisting of at least 90% of its included igniter assemblies operable.

APPLICABILITY: OPERATIONAL CONDITIONS 1 AND 2.

ACTION:

With one containment and drywell hydrogen ignition subsystem inoperable, restore the inoperable subsystem 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 />.

SURVEILLANCE REQUIREMENTS 4.6.7.2 The containment and drywell hydrogen ignition system shall be demonstrated OPERABLE:

a. At least once per 184 days, by energizing the supply breakers for igniter circuit and performing current / voltage measurements of each circuit. If more than 3 of the included igniter assemblies of either subsystem are determined to be inoperable, increase the surveillance frequency to a 92-day interval until the condition no longer exists,
b. At least once per 18 months, by energizing each igniter glow plug and:
1. verifying a surface temperature of at least 1700*F for each of the accessible igniters, and
2. verifying by measurement sufficient current / voltage to develop 1700*F surface temperature for igniter assemblies in inaccessible areas.

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REFERENCES:

(1) HGN-070, dated April 16, 1986, " Mark III Hydrogen Ignition System Technical Specification".

(2) HGN-130, dated. March 4,1988, " Final Report of 1/4 Scale Test Program".

(3) MAEC-90/0193, dated August 10, 1990, " Acceptance for Referencing of '

Licensing Topical Report Titled, " Generic Hydrogen Control Information for BWR-6 Mark III containments".

(4) HGN-141, dated May 6, 1991, " Revised Mark III Hydrogen Ignition System i Technical Specification".

GNRI-91/00107, dated May 6,1992, " Removal of Component Lists From (5)

Technical Specifications", (Generic Letter 91-08).

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