ML20078A072

Proposed Replacement of Tech Spec 3/4.6.2.2, Spray Additive Sys W/New Spec for Recirculation Fluid Ph Control Sys

ML20078A072
Person / Time
Site:	South Texas
Issue date:	09/25/1991
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20078A070	List: ML20078A072 ST-HL-AE-3879, Suppl to 901030 Application for Amends to Licenses NPF-76 & NPF-80,replacing TS 3/4.6.2.2, Spray Additive Sys W/New Spec for Recirculation Fluid Ph Control Sys During Second Refueling Outage for Unit 2 & Fourth Outage for Unit 1
References
NUDOCS 9110020042
Download: ML20078A072 (16)

Text

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ATTACllMENT 1 PROPOSED IMPLEMENTATION FOR .

UNIT 2 AT 2RE02 '!

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3.6.2.2 __m___

he Spray Additive System shall be OP[RABLE with;

a. Th and ; 42 gallons of between 30 and 32% ,and by wei

b. Three sp from its a y additive eductors each capable of addi NaOH solution System pump ociated low. spray additive tank to its Cptainment Spray APPLICABIL11Y: N00[S 1, 3, and 4.

AC110tp With status thewithinSpray 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Additive.

or be in atSystem the etable, rtsto e thet system to O restore the Spray Additive $ystem t est H015 ANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; PERABL or be in COLD SH0100VN within the foilinc 40 status hours.

within the next 4! hours 5

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' 4,6.2.2 The Spray Additive System =

all be cem strated OPERABL(:

e. At least once per 31 ys by verifying th each valve (manual, p0ver sealer, or other.it/ se:uo e:

operated, or a stic) in the flew p(Ath that is not Ic:ied ,

. in p:tition, is 'n its correct p;5iticn; At lea!! cr:t te 6 m ths ty:

1) Verifyir, tid ccntaint:

tank, nc solution volume in eactqpray ac :tive 2)

Verj a fying the concentration of the NaOH solution by c er:al blysis,

• c.

At)/ east once per 18 months during (omatic valve in the flow path attuates to its co ct s

rrect position

(.ontainment Pressure High 3 test signal; and -

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d.

At least once per 5 years by verifying: -

1)

Each eductor suction flow rate is greater than r equal to 30 gpm using the RWST as the test source to the educ or inlet, and ~

under the following conditions:

a) CS pump suction pressure is > 15 p g, b) Valve C$0019A, B, or r, as app 1' cable, is in the full open position, and '

C5 pump recirculation fio rate to the RWST is 800 gpm f 100 gpm.

2) The ines between the spr f additive tank and the eductors are o not b eked by verifyin flow.

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SOUTH TEXAS - UNITS l' & 2 3/4 6-16

l INSERT B (page 3/4 6 15)

RECUIATION FLUlD PH CONTE 0L SY1ILS (Ord f 2.)

LIMITING CONDITIONS FOR OPILATION 3.6.2.2 The recirculation fluid pH control systein shall be operabic with between 11.500 lbs. (213 cu. ft.) and 15,100 lbs. (2$2 cu. ft.) of trisodiwn phosphate (w/12 h *es) available in the storage baskets in the containment.

M'PLICAb1 L1H: Modes 1, 2, 3, and ACTION:

With less than the required artount of trisodium phosphate availabis, restore the system to the correct amount 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 1 cast HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; re tore the system to the correct amount within the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in COLD SilUTD0'n'N within the following 30 hoars.

SMtVEILIANCE REQUIREMENTS 4.6.2.2 During each refueling outage, as a minimum, the recirculation fluid pit control system shall be demonstrated operabic by visually verifying that:

1) 5 trisodium phosphate storage baskets are in place, and

2) have tcaintained their integrity, and

3) are filled with trisodium phosphate such that the level is above the indicated fill mark.

CONTAINMENT SYSTEMS I I

SPRAY ADDITIVE SYSTEM (Urnt h MfillNLfOSDMjNLEOLDI'QWNL _

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3. 6, ?./ 1he Spray Additive System shall be OPERABLE with:

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a. Ihree spray additive tanks each containing a volume of between 1061

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and 1342 gallons of between 30 and 32% by weight NaOH solution, and b.

Three spray additive eductors each capable of adding NaOH solution from its associated spray additive tank to its Containtent Spray System pump flow.  ;

APPLICABILITY: . MODES 1, 2, 3, and 4 ACTION:

With the Spray Additive System inoperable, restore the system to OP[RABLE 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 STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; resttre the Spray Additive System to OPERABLE status within the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or te in COLD SHUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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' 4. 6. 2. The Spray Additive System shall be demonstrated OPERABLE:

a.

At least once per 31 days by verifying that each valve (manual, power operated, or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position; b, At least once per 6 months by:

1) verifying the containec solution volume in each spray additive tank,_and

2) Verifying the contentration of the NaOH solution by chemical analysis, c.

At least once per 18 months during shutdown, by verifying that each automatic valve in the flow path actuates to its correct position on a Containment Pressure High 3 test signal; and 3

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d. At least once per 5 years by verifying: '

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1) Each eductor suction flow rate is greater than or equal to 30 gpm  :

using the RWST as the test source to the eductor inlet, and

• under the followinn conditions:  !

4 a) CS pump suction pressure ic > IS psi ~g7 b) Valve C50019A, 3, or C, as applicable, is in the full open position, and c) L5 pump recirculation flow rate to the RWST is 600 gpm 1 .

100 gpm, j t

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2) The lines between the spray additive tank and the eductors are i not blocked by verifying flow.

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i CONIAlNMENT SY5ifMS ,

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CONTAINMENf VfNillATION SYS1[H (Continued) fore, the SITE BOUNDARY dose guideline of 10 CTR Part 100 would not be exceeded in the event of an accident during containment PURGING operation.

Leakage integrity tests with a maximum allowable leakage rate for containment purge supply and exhaust supply valves will provide early indication of resilient .

material scal degradation and will allow opportunity for repair before gross leal

• age failures could develop. The 0.60 L leakage limit of Specification 3.6.1.1b.

shall not be exceeded when the leakage Eates detemined by the leakage integrity tests of these valves are added to the previously determined total for all valves and penetrations suSject to Type B and C tests.

,3,/f[h J DEPRf 550R12AT10N AND COOLING SYS1FHS 3/f.6.2.1 CONTAINMFNT SPRAY SYSTEM The OPERABillTY of the Containment Spray System ensures that containment depressurization and cooling capability will be available in the event of a LOCA or steam line break. The pressure reduction and resultant lower containment leakage rate are consistent with the assumptions used in the safety analyses.

. l The Containment Spray System and the Containment Cooling System both pro-vide post-accident cooling of the containment atmosphere. However, the Con-tainment Spray System also provides a mechanism for rertoving iodine from the containment atmosphere and therefore the time requirements for restoring an inoperable Spray System to OPERABLE status have been maintained consistent with that assigned other inoperable ESF equipment.

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/ 7 /4.6.2.2 SPRAY ADDITIVE SilTDr~~ ~yy, The OPERABILITY of the Spray Additive System ensures that suff OH is added to the containment spray and containment sump in thp even(kie of a LOCA.

The limits on Ha0H volume and concentration ensure a pH-value of between 7.5 and 10.0 for the solution recirculated withiru:ontMnment after a LOCA. This pH band minimizes the evolution of lodine'and minimizes the ef fect of chloride and caustic stress corrosion on-met 1Tanical systems and components. The con-tained solution volume limffincludes an allowance for solution not usable because of tanLdifdiiarga line location or other physical characteristics.

These a sumftions are consistent with the iodine-removal ef ficiency assumed in tje- ety analyses.

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• UN115 1 & 2 8 3/4 6-3 i

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/A)SE A? T' A 3/4.6.2.2 RECI.RCULATION FLUID PFLCORIROL SYSTEM The operability of the recirculation fluid pH control system ensures that ,

there is: sufficient trisodium phosphate-available in containment to guarantee a sump pH of 17.0 during the recirculation phase of a postulated LOCA. This pH level is required to reduce the potential- for chloride induced stress ,

corrosion of austenitic stainless steel and assure the retention of todine in

- the recirculating fluid. The spectfled amounts of TSP will result in a recirculation fluid pH between 7.0 and 9.5.

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CONTAINMENT SYSTEMS EME1 _ _ _ _ _ _

3/4.6.2.3 CONTAINMENT COOLING SYSTEM The OPERABILITY of the Containment Cooling System ensures that: (1) the containment air temperature will be maintained within limits during normal operation, and (2) adequate heat removal capacity is available when operated -

in conjunction with the Containment Spray Systems during post-LOCA conditions.

51 PEGS has three groups of Reactor Containment Fan Coolers with two fans in each group (total of six fans). Five fans are adequate to satisfy the

_ safety requirements including single failure.

)mwer 3/4.6.3 CONTAlte1ENT ISOLATION VALVES The OPERABILITY of the containment isolation valves ensures that the containment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment and is consistent with the requirements of General Design Criteria 54 through 57 of Appendix A to 10 CFR Part 50. Contain-ment isolation within the time limits specified for those isolation valves derigned 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.

3/4.6.4 COMBUSTIBLE GAS CONTROL The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this equipment will be available to maintain the hydrogen concentration within containment below its flammable limit during post-LOCA conditions. Either recombiner unit is capable of con-trolling the expected hydroren generation associated with: (1) zirconium-water reactions, (2) radiolytic dtcompositit of water, and (3) corrosion of metals within containment. These Hydrogen Control Systems are consistent with the re-commendations of Regulatory Guide 1.7, " Control of Combustible Gas Concentra-tion: in Containment Following a LOCA," Revision 2, November 1978.

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3/4.6.2.fSPRAYADDITIVESYSTEM The OPERABILITY of the Spray Additive System ensures that sufficient Na0li is added to the containment spray and containment sump in the event of a LOCA.

The limits on NaOH volume and concentration ensure a pH value of between 7.5 and 10.0 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on racchanical systems and components. The con-tained solution volume limit includes an allowance for solution not usable because of tank discharge line location or other physical cheracteristics.

These assumptions are consistent with the iodine removal efficiency assumed in the safety analyses.

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i PROPOSED IMPLEMENTATION FOR 4

UNIT 1 AT 1RE04 I i

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ECJA' CUIATION FLUTD PH CONTROL SYSTr.M gp ;} h [

UMITING CONDITIONS FOR OPERATION i

3.6.2.2 The recirculation fluid pit control systern shall be operable with  !

t between 11.500 lbs. (213 cu. ft.) and 15,100 lbs. (252 cu. ft.) of crisodium phosphate (w/12 hydrates) available in the storage baskets in the containment.

3 APPLICABILITY: Modes 1~, 2, 3, and 4

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With less than the required arnount of trisodium phosphate -

available, restore the system to the correct amount 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 STANDBY within the next 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />s:

restore the system to the correct amount within the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> .

or be in COLD SIIUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILIANCE REOUIREMENTS 4'.6.2.2 During each refueling outage, as a minimum, the recirculation fluid '

. pit control system shall be dernonstrated operable by visually  ;

verifying that: i i

1) 6 trisoditun phosphate storage baskers are in place, and

2) have maintained their integrity, and i

3) are filled with trisodium phosphate such that the level is '

above the indicated fill mark.  !

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)E L" T E CONTAINMENT SYSTEMS-S\RAYADDITIVESYSTEM N

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3. 6. 2. t e Spray Additive System shall be OPERABLE' with:

a. Thr spray additive tanks each containing a volume of be) een 1061 - ,

and 1342 gallons of between 30 and 32% by weight NaOH s iution, and b.

Three spbey additive educters each capable of addin 40H solution from its aQociated spray additive tank to its Con inment Spray System pump Tiow.

APPLICABILITY: H0 DES 1 . 3, and 4.

ACTION:

x With the Spray Additive System ihqperable, ret,thetore / to OPERABLE system 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 ST/dDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; restore the Spray Additive System teNOFERABLE /tatus within- the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in COLD SHUTDOWN within the follqwing ,% hours.

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' 4.6.?./ The Spray Additive System s all be den nstrated OPERABLE:

a.

At least once per 31 days by verifyingpower w path that isoperated, not locked,or au 6m sealed, or otherwis secured in position, i in its correct position;

b. At least once per 6 months by:

1) Verifyin the contained solution volume in ea spray additive tant, d

2) Veri ying the concentration of the NaOH solution b, chemical a ysis,

c. At st once per 18 months during shutdown, by verifying th each aut matic valve in the flow path actuates to its correct posi(tt n on Containment Pressure High 3 test signal; and

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C0t4TAINMEi4T SYSTEMS SURVE?tL6_ r_BERLIJREMENTS (Contiquedt- .

d. At (once per 5 years by verifying: .

1) Each tor suction flow rate is eater than or equal to 30 gpm using th T as the test soup > to the eductor inlet, and -

under the f 'l wing conditi f:

a) CS pump suctio ssure is > 15 psig, *~

b) Valve CS00 . , B, or as applicable, is in the full open positio and c) C" ump recirculation flow ra - to the RWST is 800 gpm 00 gpm.

2) The lines between the spray additive tank an'd the eductors are not blocked by verifying flow, i

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CONTAINMENT SYSTEMS MiES ~

3/4.6.2.3 CONTAINMENT COOLING SYSTEM The OPERABILITY of the Containment Cooling System ensures that: (1) the containment air temperature will be maintained within limits during normc.l operation, and (2) adequate heat removal capacity is available when operated -

in conjunction with the Containment Spray Systems during post-LOCA conditions.

STPEGS has three groups of Reactor Containment Fan CooEr~s with two fans in each group (total of six fans). Five fans are adequate to satisfy the h / safety requirements including single failure, m1N/P 3/4.6.3 CONTAINMENT ISOLATION VALVES fg The OPERABILITY of the containment isolation valves ensures that the containment atmosphere will be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment and is consistent with the requirements of General Design Criteria 54 through 57 of Appendix A to 10 CFR Part 50. Contain-ment 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, 3/4.6.4 COMBUSTIBLE GAS CONTROL  !

The OPERABILITY of the equipment and systems required for the detection and control of hydrogen gas ensures that this equipment will be available to maintain the hydrogen concentration within containment below its flammable limit during post-LOCA conditions. Either recombiner unit is capable of con-trolling the expected hydrogen generation associated with: (1) zirconium-water reactions, (2) radiolytic decomposition of water, and (3) corrosion of metals -

within containment. These Hydrogen Control Systems are consistent with the re-commendations of Regulatory Guide 1.7, " Control of Combustible Gas Concentra-tions in Containment Following a LOCA," Revision 2, November 1978.

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3/4.6.2. 's SPRAY ADDITIVE SYSTEM The OP ILITY of the Spray Additive System ensures that ufficient NaOH is added to the ontainment spray and colitainment sump in th event of a LOCA.

The limits on Na0 volume and concentration ensure a pH va) e of between 7.5 and 10.0 for the so tion recirculated within containmerit'af ter a LOCA. This pH band minimizas the volution of iodine and minimizpf the effect of chloride and caustic stress corros{on on mechanical systems hd components. The con-toined solution volume lim R incluc.; an allowan for-w49 tion not usable because of tank discharge lirl location or other physical characteristics.

These the safetyassumptions analyses. are consisten with the ipine removal efficiency assumed in A

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