ML20098D672

Proposed TS Bases 3/4.3.3.8 Re Fire Detection instrumentation,3/4.7.11 Re Fire Suppression Sys & 3/4.7.12 Re Fire Barrier Penetrations

ML20098D672
Person / Time
Site:	Sequoyah
Issue date:	05/26/1992
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20098D670	List: ML20098D668 ML20098D672
References
CON-TVA-SQN-TS-92-05, CON-TVA-SQN-TS-92-5 NUDOCS 9205290236
Download: ML20098D672 (11)

Text

us1-<--m--- A--- -----n-a- -ah- 4L4 Em a%k - + b-- 4 .E KA B M-M LsA-eWL1K-A-:- 4 4mA-= 4A-aan----A++LL W-a4 'k,-n==aemde ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION (TS) BASES CilANGE SEQUOYAll NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-92-05) i i

LIST OF AFFECTED PAGES Uni.L1 B3/4 3-4 B3/4 7-7 B3/4 7-8 Unit _2 B3/4 3-4 B3/4 7-7 l-I l

920S290236 920526 PDR ADOCK 05000327 P PDR

INSTRUMENTATION BASES 3/4.3.3.8 FIPE DETECTION INSTRUMENTATION OPERASILITY of the fire detection instrumentation ensures that adequate warning capability is available for the prompt detection of fires. This capability is required in order to detect and locate fires in their early stages. Prompt detection of fires will reduce the potential for damage to i safety related equipment and is an integral element in the overall facility fire protection program.

In the event that a portion of tne fire detection instrumentation is inoperable, the establishment of frequent fire patrols in the affected areas is required to provide deto: tion capability until the inoperable instrumentation is restored to OPERABILITY. I

_4. _

Th1= .recification is deleted.

3/4.3.3.10 EXPLOS7VE GAS MONITORING INSTRUMENTATION R152 This instrumentation ir.t.ludes provisions for monitoring the concentrations .-

of potentially explosive gas mixtures in the waste gas holdup system. The OPER- [ffic ~

ABILITY an'd use of this instrumentation is consistent with the requirements for  ?

monitoring potentially explosive gas mixtures.

t

(

l l

i l

I R153 SEQUOYAH - UNIT 1 B 3/4 3-4 Amendment No. 43, 148, 149 Revised 08/19/87 DEC 0 71990

PLANT SYSTEMS '

( BASES 4

SNUBBERS (Continueo)

) location, etc.), and the recommendations of Regulatory Guide 8.8 and 8.10- The R43 addition or deletion of any hydraulic or mechanical snubber shall be made in accordance with Section 50.59 of 10 CFR Part 50.

3/4.7.10 SEALED SOURCE CONTAMINATION

, . n.

Q3 F' The ? haitations on removable contamination for sources requiring leak tast-1 .ng, including alpha emitters, is based on 10 CFR 70.39(c) limits for plutonium.

'his limitation vill ensure that leakage from byproduct, source, and special -

auclear material sources will not exceed allowable intake values. Sealed sources are clauified into three groups according to thcir use, with surveil-lance

hat grcup. requirements commensurate with the probability of damage to a source in Those sources which are frequently handled are required to be tested more often than those which are not. Secled sources which are continu-ausly er. closed within a st ' 21ded mechanism (i.e. , sealed sources within radia-

, tion monitoring or baron measu-ing devices) are cons 4dered to be stored and need not be t$sted unless they are removed from the shielded mechanism. p' 3/4.7.11 FIRE SUPPRESSION SYSTEMS e.- The 0?ERABILITY of the fir suppren ion systems e,.ures that acequate fire suppression capability is availab < to confine and extinquish fires

"' occaring located -in any portion of the facility where safety related equipmcnt is The #4 and/o/ m. Ors, CO ,2and fire hose stations.re suppression system consists of the water sy The col'ective capability of the fire upp dssion systems ' adequato to minimize potential damage to safety related equipment and ia a major element in the facility fire protection program.

t g

In the event that portions of the fire suppression u stems are inoperable, alternate backup fire fighting equipment is required to be made available in the,affected areas until the inoperable equipment is restored to service.

g When the inoperable fire fighti. , equipment is intended for use as a backup means of fire suppression, a longer period of time is allowed to provide an alternate means of fire righting than if the inoperable equipment is the primary means of fire suppression.

The surveillance requirements provide assur .ce that tha minimum OPERABILITY requirements of the fire suppression systems are met.

In the evect she fire suppression water system becomes inocerable, immediate corrective masurt3 mude be taken since this system provides the major fire suppressicc m bility of the plant. The recoirament for a twenty-four hour i report to tt.,

wommission provides for prompt evaluation of the acceptability of the corrective measures to provide adequate fire suppression capability for tne conti.nued protection of the nuclear plant, f"/m p15C }

l SEQUOYAH - UNIT 1 June 20, 1985 R43 8 3/4 7-7 Amendment No. 39- {

PLANT SYSTEMS BASES 3/4.7.12 FIRE BARRIER PENETRATIONS

(

The functional integrity of the fire barrier penetrations ensures that fires will be portions ofconfined or adequately retarded from spreading to adjacent the facilitf. '

This design feature minimizes the possibility of a single and fire rapidly involving several areas of the facility prior to detection extinguishment.

The fire barrier penetrations are a pa.;sive element in the facility fire protection program and are subject to periodic inspections. I Fire barrier penetrations, including cable penetration barriers, fire  !

doors and dampers are considered functional when the visually observed condi-tion is the same as the as-designed condition. For those fire barrier per.<.trations that are not in the as-designed condition, an evaluation shall be performad to show that the penetration. modificatior has not degraded the fire rating of the fire barrier l During periods af time when a barrier is not functional, either,1) a I continuous fire watch is required to be maintained in the viciaity of the ,

I affected barrier, or 2) the fire detectors on at least one side of the affected barrier must ce verified OPERABLE and a hourly fire watch patrol established, until the barrier is restored to functional status. i i

ud June 20, 1985 SEQUOYAH - JNIT 1. B 3/4 7-8 Amendment No. 39 R43

INSTRUMENTATInN BASES 3/4.3.3.8 FIRE DETECTION INSTRUMENTATION OPERABILITY of the fire detection instrumentation ensures that adequate warning capability is available for the prompt detection of fires. This capability is required in order to detect and locate fires in their early stages. Prompt detection of fires will reduce the potential for damage to safety related equipment and is u integral ele ~ ant in the overall facility fire protr ction program.

In the event that a portion of the fire detection instrumentation is inoperable, the establishment of frecuent fire patrols in the affected areas ic required to provide detection capability until the inoperable instrumentation

h. restored to OPERABILITY. R35 g

3 .9 This Specification is deleted. R134 3/4.3.3.10 EXPLOSIVE GAS MONITORING INSTRUMENTATICN This instrumentation includes ;,ovisions for monitoring the concentrations of potentially explosive as mixtures in the waste gas holdup system. The OPERA- .

BILITY and 4Jse of thit instrumentation is consistent with the requirements for monitoring potentially explosive gas mixtures.

~

R134

(

l SEQUOYAH - UNIT 2 8 3/4 3-4 Amendment Nos. 35, 46, 134

[li~ )~~)

PLANT SYSTEMS BASES 3/4.7.11 FIRE SUPPRESSION SYSTEMS The OPERABILITY of the fire suppression systems ensures that adequate fire suppression capability is available to confine and extinquish fires occuring in any portion of the facility where safety related equipment is located. The fire suppression syrtem consists of the water system, spray and/or sprinklers, CO , and fire hose stations. The collective capability of thefiresuppressionkystemsisadequate.tominimizepotentialdamageto safety related equipment and is a major element in the facility fire protection program.

In the event that portions of the fire suppression systemt are inoperable, alternate backup fire fighting equipr:ent is required to be made available in the affected areas until the inoperable equipment is restored to service.

When the inoperable fire fighting equipment is intended for use as a backup means of fire suppression, a longer period of time is allowed to provide an alternate means of fire fighting than if the inoperable equipment is the primary means of fire suppression.

The surveillance requirements provide assurance that the minimum OPERABILITY requirements of the fire suppression systems are met.

s In the event the fire suppression water system becomes inoperable,- immediate corrective measures must be taken since this system provides the major fire suppression capability of the plant. The requirement for a twenty-four hour ,_

report to the Commission provides for prompt evaluation of the acceptability

_ of the corrective measures to provide adequate fire suppression capability for the continued protection of the nuclear plant.

tNSars 4.7.12 FIRE BARRIER PENETRATTONS The functional integrity of the fire barrier penetrations ensures that fires will ba ennfined or adequately retarded from spreading to adjacent portions  ; e facility. This design feature minimizes the possibility of a single fir _ . acidly involving several areas of the facility prior to detection and extinguishment. The fire barrier penetrations are a passive element in the facility fire protection program and are subject to periodic inspections.

Fire barrier penetrations, including cable penetration ba, ciers, fire l doors and dampers are considered functional when the visually observed :codi-tion is the same as the as-designed conditir.,n. For those fire barrier penetrations that are not in the as-designed condition, an evaluation shall be performed to show that the modification has not degraded the fire rating of th fire barrier penetration.

During periods of time wnen a barrier is not functional, either,1) a continuotts fire waten is required to be maintained in the vicinity of the affected barrier, or 2) the f' e detectors on at least one side of the .affected ba rier must be verified OPE: 'E and a hourly fira watch patrol established, n 'l the barrier is restored to functional status, (u l livgg72r.8 de 0 - UNIT 2 S 3/4 7-7 .

1HSIRLA All hourly fire watch patrols require that a trained individual be in the specified area at intervals of 60 minutes with a margin of 15 minutes.

m

.- - .~. . . . - -.. . . -. .- - . . - - . ~ .- -- . .

clhSERT B

,Al' hourly fire watch patrols require that a trained individual be h the

- specified area at intervals of 60 minutes with a margin of 15 minutes.

A continuous fire watch requires that a trained individual be in the specified area at all times, that-the specified area contain no ir pediment to restrict. the movements of the continuous fire watch, and that each compartment within the specified area is patrolled at least once every 15 minutes with a. margin of 5 minutes.

A specified area for a continuous fire watch is one or more locations, which are easily accessible to each other and can be patrolled wJthin

, 15 minutes. Easy access is defined as: no locked doors or inoperable card reader, no C-Zone entry required, or no hazards that will interfere with the continuous fire watch activity being performed within the ,

15-minute period.

p i

J

. , . . . . ~ . .-, . .- . -~ .- - . . . . - . _ . - _ - - - . - .- . . ~. -,

I ENCLOSURE 2 PROPOSEL TECIINICAL SPECIFICATION (TS) BASES CHANGE SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 1

--DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-T3-92-05)

DESCRIPTION AND JUSTIFICATION FOR REVISION OF TS BASES FOR FIRE WATCHES I ..

e 5

4 7

1 4

N

- - - . - _ ~ , . . . .. . . . _ . . .. . . - _ _ , , , _ .

- . - - . ._ - - . - - - . . _ _ _ _ - . - . . . ~ . _ - - - - - . . . - . ._ ,

, . Desnrjation of Change TVA proposes to modify the Sequoyah Nuclear Plant (SQN) Units 1 and 2 technical specifications (TSs) bases to revise TS Bases 3/4.3.3.8, " Fire Detection Instrumentation," 3/4.7.11. " Fire Suppression Systems," and 3/4.7.12, " Fire Barrier Penetrations." The changes provide clarification and interpretation for both hourly and continuous fire watches.

The following wording is proposed to be added to TS Bases 3/4.3.3.8:

All hourly fire wntch patrols require that a trained individual oe in the specified area at intervals of 60 minutes with a margin of 15 minutes.

The following wording is proposed to be added to TS Bases 3/4.7.11 and 3/4.7.12:

All hourly fire watch patrols require that a trained individual be in the specified area- at intervals of 60 minutos with a margin of 15 minutes.

A continuous fire watch requirer + hat a trained individual be in the specified area at all times, that the specified area centains no impediment tc restrict the movements of the continuous fire watch, and that each compartment within the specified area is patrolled at least once every 15 minutes with a margin of 5 minutes.

A specified area for a continuous fire watch is one or more locations, whits are easily accessible to each other and can be patrolled within 15 minutes. Easy access is defined ;as: no locked doors or inoperable card reader, no step-off pads, or no hazards that will interfere with the continuous fire watch activity being performed within the 15-minute period.

Reaann for Change The TSs do not currently provide an interpretation of the terms " hourly" or " continuous" fire watches; the addition of the proposed discussion to the TS bases will allow all personnel to have a common-interpretation of l these terms.

The proposed change will aid in the reduction of fire-watches not believed to be necessary for the prompt detection of fires and will clarify the requi ements for meeting the time frequencies of the watches. Adding this information to the bases will reduce the fire watch btrden at SQN by allowing a single continuous fire watch to cover more than one impairment at a time, i,lualification for thange It is desirable to quantify the limits associated with the hourly patrol requirements and provide tolerances. Defining an hourly fire watch-

~

frequency as 60-minute intervals with a 15-minute margin provides

-reasonable administrative flexibility and is consistent with other TS surveillance frequencies that allow margins of 25 percent.

l l

r l . - - , . _ _ . , , _ . . . . - ,

The current TS wording infers.a separate stationary, continuous-firewatch is needed for each compartment or area outside immediate visual range.

It. is believed that prompt detectior of fires can be achieved by a-continuous fire watch monitoring multiple impairments in a given fire area, provided movement is not restricted by locked doors, contamination zones, etc.,'and the impairments are checked no less than every 15 minutes.with a 5-minute margin.

These changas are considered to provide reasonable administrative flexibility and reduce the overall firewatch burden while maintaining an acceptable level of detection. The proposed changes are not considered to change the intent of the TSs and are similar to the wording contained in the corresponding D. C. Cook 1;uclear Plant technical specification bases.

L-I.

l f

I.

L

- , -e , w, ., ,. - - .+4,_ yw.,