ML20141K257

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Proposed Tech Specs 3.7.6 Re Main Room Habitability Sys
ML20141K257
Person / Time
Site: 05200003
Issue date: 08/31/1996
From:
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20141K241 List:
References
NUDOCS 9705280412
Download: ML20141K257 (11)
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Text

  • ' i Main Control Room Habitab.ility System (VES) 3.7.6
  • l 3.7* PLANT SYSTEMS 3.7.6 Main Control Room Habitability System (VES)

LC0 3.7.6 Two Main Control' Room (MCR) Habitability System trains shall '

be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4. I During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME l

A. One VES train A.1 Restore VES train to 7 days inoperable. OPERABLE status.

B. MCR air temperature B.1 Restore MCR air 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> not within limit. temperature to within  !

limit.

I C. Loss of integrity of C.1 Restore MCR pressure 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> MCR pressure boundary to OPERABLE boundary, status D. ' Required Action and 0.1 Be in MODE 3. 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> associated Completion Time of Conditions A, AND '

B, or C not met in 3G

, MODE 1, 2, 3, or 4. D.2 Be in MODE / g

/ hours I 'E. Required Action and E.1 Suspend CORE Immediately associated Completion ALTERATIONS.

Time of Conditions A, l

B, or C not met AND l- during movement of irradiated fuel. E.2 Suspend movement of Imediately .

irradiated fuel assemblies, i

! 9705280412 970519 (continued)

DR ADOCK 052 03 AP600 3.7-11 08/96 Amendment 0 u o.uo m ,ooe m

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t, Main Control Room Habitability System (VES) r

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3.7.6 i

AC's (CAS (continued)

, CONDITION REQUIRED ACTION COMPLETION TIME F. Two VES trains F.1 Be in MODE 3. 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> inoperable in MODE 1, 2, 3, or 4. AND F.2 Be in MODE.4. 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Aub Kx Roshe one NGS 'c<nin tv  % hours oescA64 ste%s.

G. Two VE3 trains G.1 Suspend CORE Immediately inoperat,le during ALTERATIONS.

movement of irradiated fuel. AND G.2 Suspend movement of Immediately irradiated fuel assemblies.

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i h AP600 3.7-12 08/96 Amendment 0

Main Control Room Habitability System (VES) 3.7.6 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.6.1 Verify Main Control Room air temperature 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> i s s Sd* F .

78 SR 3.7.6.2 Verify that the compressed air storage 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> tanks are pressurized to [2: 3400psig}

4et c 3500 p;id f SR 3 . '7. 6. 3 Verify that each VES air delivery In accordance isolation valve is OPERABLE. with the Inservice Testing Program SR 3.7.6.4 Verify that each VES air header manual 31 days isolation valve is in an open position.

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SR 3.7.6.5 Verify that all VBS Main Control Room 24 months isolation dampers are OPERABLE and will close upon receipt of an actual or simulated actuation signal. ,

1 SR 3.7.6.6 Verify that each VES pressure relief In accordance isolation valve within the MCR pressure with the boundary is OPERABLE. Inservice Testing Program i

SR 3.7.6.7 Verify that each VES pressure relief 24 months j damper is OPERABLE.

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(continued)

L h AP600 3.7 13 08/96 Amendment 0 w o.uo= me.om

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Main Control Room Habitability System (VES)

- 3.7.6 f SUR EILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.7.6.8 Verify that the self contained pressure In accordance regulating valve in each VES train is with the l OPERABLE. Inservice Testing Program SR 3.7.6.9 Verify that one VES air delivery train In accordance maintains a positive pressure in the with the l

MCR, relative to the adjacent areas, at Inservice the required air addition flowrate. Testing Program 1

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$,ff6fL,,,_,,,, 3.7-14 08/96 Amendment 0 l

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, . .. Main Control Room Emergency Habitability System B 3.7.6 t .

B 3'.7 PLANT SYSTEMS B 3.7.6 Main Control Room Emergency Habitability System BASES

, BACKGROUND The Main Control Room Habitability System (VES) provHes a protected environment from which operators can control the plant following an uncontrolled release of radioactivity.

l The system is designed to operate following a Design Basis Accident (DBA) which requires protection from the release of radioactivity. In these events, the Nuclear Island Non-Radioactive Ventilation System (VBS) would continue to function if AC power is available. If AC power is lost or a High-2 main control room (MCR) radiation signal is received, the VES is actuated. .The major functions of the VES are:

1) to provide forced ventilation to deliver an adequate

' supply of breathable air for the MCR occupants; 2) to provide forced ventilation to maintain the MCR at a 1/8 inch /

water gauge positive pressure with respect to the surrounding areas; and 3) to limit the temperature increase of the MCR equipment and facilities that must remain functional during an accident, via the heat absorption of passive heat sinks.

( The VES consists of two redundant trains each with compressed air storage tanks and associated valves, piping, l and instrumentation. Each set of tanks contains enough breathable air to supply the required air flow to the MCR for at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The VES system is designed to maintain CO, concentration less than 0.5% for up to 11 MCR occupants with both trains operating. With one train operating, VES maintains CO 2 concentration less than 0.5% for up to 5 MCR occupants, and maintains 00 concentration less than 1.0% for up to 11 MCR occupants.

Sufficient thermal mass exists in the surrounding concrete structure (including walls, ceiling and floors) to absorb the heat generated inside the MCR, which is initially at or F. Heat sources inside the MCR include operator N p

  • workstat ions, emergency lighting and cccupants. Sufficient insulation is provided surrounding the MCR pressure boundary to preserve the minimum required thermal capacity of the heat sink. The insulation also limits the heat gain from the adjoining areas following the loss of VBS cooling.

(continued)

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l h ,AP600 B 3.7-24 08/96 Amendment 0

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1 Main Control Room Emergency Habitability System B 3.7.6 BASES BACKGROUND l If the VBS remains unavailable following the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period,  !

(continued) cooling of the MCR air is achieved by portable air coolers.

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The compressed air storage tanks are initially pressurized to 3400 psig. During operation of the VES, a self contained pressure regulating valve maintains a constant downstream pressure regardless of the upstream pressure. An orifice

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downstream of the regulating valve is used to control the  ;

l air flow rate into the MCR. The MCR is maintained at a 1/8 l inch water gauge positive pressure to minimize the infiltration of airborne contaminants from the surrounding areas.

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APPLICABLE Two redundant sets of compressed air storage tanks SAFETY ANALYSES are sized such that each set of tanks has a combined capacity that provides at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of VES operation.

    • rwlb y to Operation of the VES is automat cally initiated by either ofGen 1 two safety related signals: 1) .cs: cf all - "^ m or  :
2) W#Fa ' ' d. FD "dhtirparticulate or iobe,radioachdy.  !
5. In the event of a loss of all AC power, the VES functions to. 1 1

provide ventilation, pressurization, and cooling of the MCR pressure boundary.

In the event of a high leveA of gawavs rctic rocAioachviY r';'rr rt outside of the

! MCR, the VBS continues to operate to provide pressurization i

and filtration functions. The MCR air supply downstream of r i co rfn 7 ,"

b STdN-orAicdu,tp o n e setpoint/ a safety related signal is generated to isolate P the MCR from the VBS and to initiate air flov froc, the VES storage tanks. 1 n of the VBS consists of closing L

fdOOC safetyrelateddg010dnthesupplyandexhaustductsthat

'?M penetrate the MCR pressure boundary. VES air flow is l initiated by a safety related signal which opens the l isolation valves in the VES supply lines.

ThE VES functions to mitigate a DBA or transient that either assemes the failure of or challenges the integrity of the fission product barrier.

The VES satisfies the requirements of Criterion 3 of the NRC

Policy Statement.

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AP600 B 3.7-25 ow u.om m o ox. 08/96 Amendment 0

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Main Control Room Emergency Habitability System B 3.7.6 BASES (continued)

LCO The VES limits the MCR temperature rise and maintains the l MCR at a positive pressure relative to the surrounding '

environment.

I Two independent and redundant VES trains are required to be OPERABLE to ensure that at least one,is available, assuming a single failure disables the other train.

The VES is considered OPERABLE when the individual components necessary to deliver a supply of breathable air l-to the MCR are OPERABLE in both trains. This includes components . listed in SR 3.7.6.2 through 3.7.6.8. In addition, the MCR pressure boundary must be maintained, including the integrity of the walls, floors, ceilings, duct p

' work, electrical and mechanical penetrations, and access doors. '

i APPLICABILITY The VES is required to be OPERABLE in MODES 1, 2, 3, and 4 and during movement of irradiated fuel because of the potential for a fission product release following a DBA.

The VES is not required to be OPERABLE in MODES 5 and 6 when irradiated fuel is not being moved because accidents resulting in fission product release are not postulated.

ACTIONS A.1 When one VES train is inoperable, action is required to  !

restore the system to OPERABLE status. A Completion Time of'  ;

7 days is permitted to restore the train to OPERABLE status '

before action must be taken to reduce power. The Completion Time of 7 days is based on engineering judgment, considering the low probability of an accident that would result in a significant radiation release from the fuel, the low probability of not containing the radiation, and that the remaining train can provide the. required capability.

B.1 When the main control room air temperature is outside the l acceptable range during VBS operation, action is required to restore it to an acceptable range. A Completion Time of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is permitted based upon the availability of

temperature indication in the MCR. It is judged to be a l sufficient amount of time allotted to correct the deficiency '

! in the nonsafety ventilation system before shutting down.

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! HAP 600 B 3.7-26 08/96 Amendment 0  ;

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. . . Main Control Room Emergency Habitability System B 3.7.6 BASES i

ACTIONS C.1 (continued)

If the MCR pressure boundary is damaged or otherwise degraded, action is required to restore the integrity of the pressure boundary and restore it to OPERABLE status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. A Completion Time of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is permitted based upon operating experience. It is judged to be a sufficient amount of time allotted to correct the deficiency in the pressure boundary.

0.1 and 0.2 4

In MODE 1, 2, 3, or 4 if Conditions A, B, or C cannot  !

be restored to OPERABLE status within the required l Completion Time, the plant must be placed in a MODE that '

minimizes accident risk. This is done by entering MODE 3 within g hours and MODE / within 74 hours8.564815e-4 days <br />0.0206 hours <br />1.223545e-4 weeks <br />2.8157e-5 months <br />.

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E.1 and E.2 1

During movemert of irradiated fuel assemblies, if the i inoperable VES train cannot be restored to OPERABLE status, Required Actions A.1, B.1, or C.1 cannot be completed within i t ,

t the required Completion Time, the movement of fuel and core l l

alterations must be suspended. Performance of Required Action E.1 and E.2 shall not preclude completion of actions

~ to establish a safe condition.

F.1 and F.2 If both VES trains are inoperable in MODE 1, 2, 3, or 4, the VES and mustmay be brought notto be j capable MODE of performing 4 where the probabilityAe vh consequences of an event are minimized, Ther;2m MJ0E 3 must be achieved within # hours and MODE 4 within 241ours, r/d#

la and one NES ktdn most G.1 and G.2 be q3M 5 Lui m g ()% g tf.

hwes.

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During movement of irradiated fuel assemblies w th wo VES (

trains inoperable, the Required Action is to immediately l l suspend activities that present a potential for releasing radioactivity that might enter the MCR. This places the plant in a condition that minimizes risk. This does not preclude the movement of fuel to a safe position.

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'**.,"",' Main Control Room Emergency Habitability System B 3.7.6 ,

. l BASES (continued)

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l SURVEILLANCE- SR 3.7.6.1 REQUIREMENTS i The MCR air temperature is checked at a' frequency of i 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to verify that the VBS is performing as required to j maintain the initial condition temperature assumed in the j safety analysis, and to ensure that the MCR temperature will not exceed the required conditions after loss of VBS cooling. The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency is acceptable based on the availability'of temperature indication in the MCR.

SR 3.7.6.2 '> 1 l

Verification every 24 hou s that compressed air storage tanks are pressurized to 3400 psig' is sufficient to ensure I that there will be an adequate supply of breathable air to maintain MCR habitability fer a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The Frequency of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is based on the availability of pressure indication in the MCR.

, SR 3.7.6.3 VES air delivery isolation valves are required to be verified as OPERABLE. The Frequency required is in accordance with the Inservice Testing Program.

j SR 3. /.6.4 -

,-( VES air header isolation valves are required to be verified osen at 31 day intervals. This SR is designed to ensure tlat the pathways for suppl ing breathable air to the MCR are available should loss o VBS occur. These valves should' be closed only during required testing or maintenance of downstream components, or to pr9clude compbte depressurization of the system should the VES isolation valves in the air delivery line open inadvertently or begin to leak.

SR 3.7.6.5

  • i Verification that all VBS isolation devices are operable and l

I will actuate upon demand is required every 24 months to ensure that the MCR can be isolated upon loss of VBS

operation.

(continued) i h AP600 B 3.7-28 08/96 Amendment 0 l _

,'* , . , Main Control Room Emergency Habitability System B 3.7.6 BASES t SURVEILLANCE SR 3.7.6.6 l REQUIREMENTS l

(continued) Verification that each VES pressure relief isolation valve  !

within the MCR pressure boundary is OPERABLE is required in accordance with the Inservice Testing Program. The SR is  !

used in combination with SR 3.7.6.7 to ensure that adequate vent area is available to mitigate MCR overpressurization.

SR 3.7.6.7 Verification that the VES pressure relief damper is OPERABLE is required at 24 month intervals. The SR is used in combination with SR 3.7.6.6 to ensure that adequate vent 1 area is available to mitigate MCR overpressurization. l SR 3.7.6.8 Verification of the operability of the self-contained pressure regulating valve in each VES train is required in j accordance with the Inservice Testing Program. This is done to ensure that a sufficient supply of air is provided as required, and that uncontrolled air flow into the MCR will not occur. I k SR 3.7.6.9 1

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Per Reference 3, a functional test is required to "e9; that one VES ajr delige i udgineksdmg the safety-related compressed air source is able F to piegize the!

1/8 inch water gauge pressure relative to the hMM,1ff the required air addition flowrateof I 25

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+ 2 scfm. The test need not last 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />,is only 19:o ic 'c:* !ong enough to demonstrate r-t of ability to achieve the desired differential pressure;" !: -^* rr c :-*r-ded !c S:t "'2 a

hcur: ;- durc*!cc The control room leakage rate must be within the design capacity of the safety-related systems to pressurize the control roomfor 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. One air delivery train is tested on l

an alternating basis, in accordance with the System Level Inservice Testing Program. j s '

i REFERENCES 1. AP600 SSAR, Section 6.4, " Main Control Room Habitability Systems." l

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2. AP600 SSAR, Section 9.4.1, " Nuclear Island Non-Radioactive Ventilation System."
3. St0Y- % u " PoM cv and Te&okal lssoes Associalec) todh he Byshry Trfabent of mn-Sabj Sy*ms j (RTNs4 in Ihsseve PM tesgs(secy-99-ose" rnay aa, es .

b AP600 8 3.7-29 08/96 Amendment 0 l as01uee8mses\10030704.#00401304

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3. Design of Structures, Components, Equipment, and Systems l

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5. The flow capability of each IRWST injection line is demonstrated every 10 years. This demonstration is accomplished by conducting flow tests and inspections. A flow test is conducted to demonstrate the flow capability of the injection line from the IRWST through the IRWST injection check valves. Water flow from the IRWST through the IRWST injection check valve demonstrates the flow capability of this portion of the line. The test is terminated when the flow measurement is obtained. The portion of the line from the IRWST squib valve to the DVIline is demonstrated by an inspectica of the inside of the line. The inspection will show l that the lines are not obstructed. It is not necessary to operate the IRWST injection squib valves for this inspection.

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6. The flow capability of each containment recirculation line is demonstrated every 10 years. This demonstration l is accomplished by conducting an inspection. The line from the containment to the containment recirculation i squib valve is inspected from the containment side. The line from the squib valve to the IRWST injection line  ;

is inspected from the IRWST side. The inspection will show that the lines are not obstructed. It is not i necessa:y to operate the containment recirculation squib valves for this inspection.

7. The heat transfer capability of the passive residual heat exchanger is demonstrated every 10 years. This I demonstration is accomplished by conducting a test during cold shutdown conditions. The test is conducted with I the RCPs in operation and the RCS at a reduced temperature. Flow through the heat exchanger is initiated by opening one outlet isolation valve. The test is terminated when the flow and temperature measuremen's are obtained, l 8. The MCR pressurization capability is demonstrated during each refueling cycle. The test is conducted wi.h the I normal HVAC lines connected to the MCR isolated. Pressurization of the MCR is initiated by openinF one of I the emergency MCR habitability air supp'y lines. The test is a limited duration test and is terminatu! when l l the MCR pressurization is measure 4w & on air how coM of .15 t 3 sh . ,

i l I fo /g inc.h wekt gu==2 uth respec;k g succound.ag ctreas

9. The hydrogen recombination capability is dsmonstiste8by performing a surveillance bench tot of samples l removed from each passive autocatalytic reconbir :r during each refueling outage. In addison, each passive autocatalytic recombiner device is visually inspected to verify that there is no obstructioa of blockage of the inlets or outlets.

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Revision: 11 February 28,1997 3.9-168 3 Westillgflouse

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