ML20091N948

Proposed Tech Specs 3/4.7.6 Re Control Room Air Conditioning Sys

ML20091N948
Person / Time
Site:	Waterford
Issue date:	08/30/1995
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20091N945	List: ML20091N942 ML20091N948
References
NUDOCS 9508310331
Download: ML20091N948 (9)

Text

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PLANT SYSTEMS 3/4.7.6.1 CONTROL ROOM EMERGENCY AIR FILTRATION SYSTEM LIMITING CONDITION FOR OPERATION 3.7.6.1 Both control room emergency air filtration trains (S-8) shall be OPERABLE.

APPLICABILITY

MODES 1, 2, 3. and 4.

ACTION:

a. With one control room emergency air filtration train inoperable, either restore the inoperable train to OPERABLE status within 7 days 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 /> and in COLD SHUTDOWN 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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b. With both control room emergency air filtration trains inoperable, restore one train to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 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 /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

! SURVEILLANCE REQUIREMENTS I

4.7.6.1 Each control room emergency air filtration train (S-8) shall be demonstrated OPERABLE-:

, a. At least once per 31 days on a STAGGERED TEST BASIS by initiating, from the i control room, flow through the HEPA filters and charcoal adsorbers and verifying that the system operates for at least 10 continuous hours with the heaters on.

b. At least once per 18 months or (1) after any structural maintenance on the HEPA filter or charcoal adsorber housings. or (2) following painting. fire or chemical release in any ventilation zone communicating with the system by:

1. Verifying that the filtration train satisfies the in place testing acceptance criteria and uses the test procedures of Regulatory Positions C.S.a. C.5.c and C.5.d of Regulatory Guide 1.52. Revision 2.

March 1978, and the system flow rate is 4225 cfm i10%.

2, Verifying within 31 days after removal that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52. Revision 2. March 1978. meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52. Revision 2. March 1978.

3. Verifying a system flow rate of 4225 cfm 110% during train operation when tested in accordance with ANSI N5101975.

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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

c. After every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation by verifying within 31

. days after removal that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory i

Guide 1.52. Revision 2. March 1978, meets the laboratory testing criteria of i Regulatory Position C.6.a of Regulatory Guide 1.52. Revision 2. March 1978.

d. At least once per 18 months by:

1. Verifying that the pressure drop across the combined HEPA filters and ,

4 charcoal adsorber banks is less than 7.8 inches water gauge while

operating the train at a flow rate of 4225 cfm *10%.

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2. Verifying that on a safety injection actuation test signal or a high

' radiation test signal, the train automatically switches into a

. recirculation mode of operation with flow through the HEPA filters and  :

charcoal adsorber banks.

5 3. Verifying that heaters dissipate 10 (+0.5. -1.0) kW when tested in

< accordance with ANSI N510-1975.

! e. After each complete or partial replacement of a HEPA filter bank by verifying i that the HEPA filter banks remove greater than or equal to 99.95% of the DOP j when they are tested in-place in accordance with ANSI N510-1975 while

operating the train at a flow rate of 4225 cfm *10%.

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! f. After each complete or partial replacement of a charcoal adsorber bank by l verifying that the charcoal adsorbers remove greater than or equal to 99.95%

of a halogenated hydrocarbon refrigerant test gas when they are tested in-place in accordance with ANSI N510-1975 while operating the train at a flow

. rate of 4225 cfm A10%.

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PUWT SYSTEMS l 3/4,7.6.2 CONTROL ROOM EMERGENCY AIR FILTRATION SYSTEM LI'MITING CONDITION FOR OPERATION 3.7.6.2- Two One control room emergency air filtration trains (S-8) shall be OPERABLE. l APPLICABILITY: H0 DES 5 and 6.

i ACTION:

With both control r00'" =rgency 21- #41trat10n trains inoperable = pend all Operation 4"volving C0oE ALJER^7?O'S cr positive reacti"ity chang 00.

a. With one control room emergency air filtration system inoperable, restore the inoperable system to OPERABLE status within 7 days or initiate and maintain operation of the remaining OPERABLE control room emergency air filtration system in the recirculation mode.

s L With both control room emergency air filtration systems inoperable, or with the OPERABLE control room emergency air filtration system, required to be in

$ the recirculation mode by ACTION a, not capable of being powered by an OPERABLE emergency power source, suspend all operations involving CORE ALTERATIONS or positive reactivity changes.

SURVEILLANCE REQUIREMENTS 4.7.6.2 The control room emergency air filtration trains (S-8) shall be demonstrated OPERABLE per the applicable Surveillance Requirements of 4.7.6.1.

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PLANT SYSTEMS

-3/4.7.6.3 CONTROL R00H AIR TEMPERATURE 4

LIMITING CONDITION FOR OPERATION 3.7.6.3 Two independent control room air conditioning units shall be OPERABLE.

APPLICABILITY: MODES 1. 2, 3 and 4.

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! ACTION:

a. With one control room air conditioning unit inoperable. -maintain contr01 room te perature 1000 then Or equal t0 80*Fand restore the inoperable unit to OPERABLE status within 7 days or be in 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 /> and in COLD SHUTDOWN 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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b. With two control room air conditioning units inoperable. and control r00-te=perature greater then Or Ogual to 80*r return one unit to an OPERABLE

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status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in 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 /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS Each control room air conditioning unit shall be demonstrated OPERABLE:

) 4.7.6.3 4 a. At least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> by verifying that the operating control room  !

I air conditioning unit is maintaining average control room air temperature less than or equal to 80*F.

b. At least quarterly if not performed within the last quarter. by )

verifying that each control room air conditioning unit starts and l operates for at least 15 minutes.

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PLANT SYSTEMS

• I 3/4.7.6.4 CONTROL ROOM AIR TEMPERATURE' LIMITING CONDITION FOR OPERATION 3.7.6.4 Two One independent control room air conditioning units shall be OPERABLE. l APPLICABILITY: MODES 5 and 6.

ACTION:

With b0th contr01 r00'" air conditioning unit inoperable. Suspend all operation: 4 vol"4ng C0oE ^LTER*?!0'S Or p0 itive reacti"ity change;.

L With one control room air conditioning unit inoperable, restore the inoperable system to OPERABLE status within 7 days or initiate and maintain operation of the remaining OPERABLE control room air conditioning uni t .

'b2 With both control room air conditioning units inoperable, or with the OPERABLE control room air conditioning unit, reauired to be in operation by ACTION a, not capable of being powered by an OPERABLE emergency power source, suspend all operations involving CORE ALTERATIONS or positive reactivity changes.

SURVEILLANCEREQUIRENENTS-4.7.6.4 The control room air conditioning units shall be demonstrated OPERABLE per the l Surveillance Faquirements of 4.7.6.3.

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3/4.7.6.B CONTROL R00H ISOLATION AND PRESSURIZATION l LIMITING CONDITION FOR OPERATION

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3.7.6.5 The control room envelope isolation and pressurization boundaries shall be OPERABLE. l APPLICABILITY: All MODES.

. ACTION:

8 a, With either control room envelope isolation valve in a normal outside air flow i path inoperable, maintain at least one isolation valve in the flowpath i OPERABLE, and either restore the inoperable valve to OPERABLE status with 7 days or isolate the affected flow path within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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b. With any Control Room Emergency Filter Outside Air Intake valve (s) inoperable, maintain at least one of the series isolation valves in a flowpath OPERABLE, and either restore the inoperable valve (s) to OPERABLE status within 7 days or isolate the affected flow path within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

c. With more than one Control Room Emergency Filter Outside Air Intake flow path inoperable, maintain at least one flow path per intake operable and restore an

additional flow path to operable status within 7 days or, be in 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 /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

d. With the control room envelope inoperable as a result of causes other than

' those addressed by ACTION (a), (b), or (c) above:

1. Within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> thereafter while the control room envelope is inoperable, verify that the Emergency j Breathing Airbanks pressure is greater than or equal to 1800 psig.

] 2. MODES 1-4:

i' If the cause of control room envelope inoperability is due to a a.

known breach in the envelope of less than or equal to one square foot total area or the breach is associated with a permanent

sealing mechanism (e.g. , blocking open or removing a door) then 4

the cause of the failure is 4thir LCO its operation may continue for up to 7 days af ter the control room envelope is declared inoperable. Otherwise, be in 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 /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

Breache i- the pressur4 ation boundary may be allowed for a period not to exceed days on an interaf ttent basis under administrative control provided that--they are of known j origi" and either-

1. Breache; eith perman^nt 50: ling '"echanism (e.g., door Or damperd OR

2. breache; less than or equal to 1 square #00t.

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y PtANT SYSTENS LINITING CONDITION FOR OPERATION 1

ACTION: (Continued) l

b. If the cause of Identify the cause of control room envelope inoperability is urtnown the failure identify the cause within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> t -and-4C tiate ccrrective action to If the cause of the failure is due to a breach within the allowable limits of ACTION J d.2.a then operation may continue for up to 7 days after the control room envelope is declared inoperable. Otherwise. be in '

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 /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

cb. Should a toxic gas event occur, take immediate steps to restore control room envelope integrity; and cc-^nce a plant shutdown to bc i- 'OT ST^R09Y within the next 6 hour: and COLD SHU"0WN withi- th^ following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

3. H0 DES 5 and 6:

a. Suspend all operations involving CORE ALTERATIONS or positive reactivity changes and if a toxic gas event occurs, take immediate steps to restore control room envelope integrity.

SURVEILLANCE REQUIRENENTS l 4.7;6.5 The control room envelope isolation and pressurization boundaries shall be demonstrated OPERABLE at least once per 18 months by;

a. Verifying that the control room envelope can be maintained at a positive pressure of greater than or equal to 1/8 inch water gauge relative to the outside atmosphere with a make-up air flowrate less than or equal to 200 cfm during system operation.

b. Verifying that on a toxic gas detection test signal, the system automatically switches to the isolation mode of operation.

c. Verifying that on a safety injection actuation test signal or a high radiation test signal normal outside air flow paths isolate.

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.. l PLANT SYSTEMS l BASES l l

i 3/4.7.6.1 and 3/4.7.6.2 CONTROL R00H EMERGENCY AIR FILTRATION SYSTEM During an emergency, both S-8 units are started to provide filtration and adsorption of )

outside air and control room envelope recirculated air (reference: FSAR 6.4.3.3). Dosages received after a full power design basis LOCA were calculated to be orders of magnitude higher than other accidents involving radiation releases to the environment (reference: FSAR Tables 15.6-18, 15.7 2, 15.7-4. 15.7-5. 15.7-7), Because the consequences of a full power l design basis LOCA are more severe than those occurring during COLD SHUTDOWN and REFUELING, a separate specification, 3/4.7.6.2, requires only one OPERABLE S-8 unit to guard against accidents during Modes 5 and 6.

The OPERABILITY of this system and control room design provisions are based on limiting the radiation exposure to personnel occupying the control room to 5 rem or less whole body. or its equivalent. This limitation is consistent with the requirements of General Design Criterion 19 of Appendix A.10 CFR Part 50.

Operation of the system with the heaters on for at least ten hours continuous over a thirty-one day period is sufficient to reduce the buildup of moisture on the adsorbers and HEPA filters. Obtaining and analyzing charcoal samples after 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of adsorber operation (since the last sample and analysis) ensures that the adsorber maintains the efficiency assumed in the safety analysis and is consistent with Regulatory Guide 1.52, 3/4.7.6.3 CONTROL R00H AIR TEMPERATURE Maintaining the control room air temperature less than or equal to 80*F ensures that (1) the ambient air temperature does not exceed the allowable air temperature for continuous duty rating for the equipment and instrumentation in the control room, and (2) the control room will remain habitable for operations personnel during plant operation.

The Air Conditioning System is designed to cool the outlet air to approximately 55'F. Then, non safety-related near-room heaters add enough heat to the air stream to keep the rooms between 70 and 75"F. Although 70 to 75*F is the normal control band. it would be too restrictive as an LCO. Control Room equipment was specified for a more general temperature range of 45 to 120*F. A provision for the CPC microcomputers, which might be more sensitive to heat, is not required here. Since maximum outside air make-up flow in the normal ventilation mode comprises less than ten percent of the air flow from an AH-12 unit, outside air temperature has little affect on the AH-12s cooling coil heat load. Therefore.

the ability of an AH-12 unit to maintain control room temperature in the normal mode gives adequate assurance of its capability for emergency situations. )

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P PLANT SYSTEMS BASES (Continued) 3/4.7.6.4 CONTROL ROOH ISOLATION AND PRESSURIZATION This specification provides the operability requirements for the control room envelope isolation and pressurization boundaries. The Limiting Condition for Operation (LCO) specifies specific ACTION STATEMENTS for inoperable components of the control room ventilation systems. separate from the S-8 and AH-12 units. The operability of the remaining parts of the system affect the ability of the control room envelope to pressurize.

^ routine ::inte"ance provision 1 4ncluded 4" the LCO 4- the for Of a f00tncte. "'1 :

prev 4sion allom for sm !' penetration: 4" the control r00 envelop ^ Or blockage Of ^^v010pc docr or d: per; for a period not t0 0-ceed ' day: On n inter-ittent b 01: provid^d that appropriate admi^tstrative control are 4 pl^-^nted.

ACTION STATEMENTS a and b focus on maintaining isolation characteristics. The valves in the flow path referred to in ACTION a are HVC-102 & HVC-101. The Outside Air Intake (OAI)

" series isolation valves" of ACTION b and c are as follows:

NORTH OAI - HVC-202B & HVC-201A HVC 202A & HVC-201B SOUTH OAI - HVC-2048 & HVC-203A HVC-204A & HVC-2038 ACTION STATEMENT c preserves the operator action (i.e., manually initiated filtered pressurization) that maintains the control room envelope at a positive pressure during a radiological emergency. As indicated above each OAI series isolation valve is powered by the opposite train. With more than one OAI flow path inoperable a single failure (i .e.,

train A or B) could prohibit the ability to maintain the control envelope at a positive pressure. Therefore. in the specified condition. ACTION c requires an additional flow path to be returned to service within 7 days. )

ACTION STATEMENT d.2.a is intended to address an intentional breach in the control room .

pressurization boundary as necessary to support maintenance or modification. A breach of this nature shall be limited in size and governed under administrative controls. The size 1 restrictions as stated in the ACTION are such that should a toxic event occur control room 1 I

integrity can be immediately restored as described below. ACTIONSTATEMENTdJ. bis intended to restore pressurization ability as soon as possible for unintended breaches in the envelope. The 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> to locate an unidentified breach is based on an evaluation that considered troubleshooting tasks that would be performed as necessary should the integrity of the Control Room Envelope pressure boundary fall into question. Estimated times j associated with each task were based on sound engineering judgment. The ACTION statements also recognize the MODE independent nature of the toxic chemical threat and provides for I operator protection in the event of a toxic chemical release concurrent with a breach in thb control room envelope. In addition. provisions have been added to the specification that, in the event of a toxic chemical event that threatens control room habitability while in the ACTION statements. "immediate steps" will be initiated to place the plant in a safe condition. In this context, the phrase "immediate steps" is taken to mean that the operators should immediately take reasonable action to restore a known breach in the envelope to an air-tight condition. Amplifying instructions are provided in Waterford 3 Administrative procedures, which impose special controls for work that will breach the control room envelope. I WATERFORD - UNIT 3 B 3/4 7-?? l

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