ML20138C326

Proposed Tech Specs 3/4.7.6 Revising Limiting Condition for Operation to Include New Required Actions in Event That One or Both Channels of Radiation Monitoring Instrumentation Becomes Inoperable

ML20138C326
Person / Time
Site:	Davis Besse
Issue date:	04/18/1997
From:	CENTERIOR ENERGY
To:
Shared Package
ML20138C306	List: ML20138C303 ML20138C313 ML20138C326
References
NUDOCS 9704300091
Download: ML20138C326 (5)

Text

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+ , LAR 97-0005

. Paga 8 ADDITIONAL CtlANGES PREWOUSLY  !

PROPOSED SY LUTER

, PLANT SYSTEMS Serial No. 2 3 I3 Date 9/I?/9L 3/4.7.6 CONTROL ROOM EMERGENCY VENTILATION SYSTEM LIMITING CONDITION FOR OPERATION 3.7.6.1 Two independent control room emergency ventilation systems shall be OPERABLE.

APPLICABILITY: MODES 1,2,3 and 4.

ACTION: '

g With one control room emergency ventilation system inoperable, restore the inoperable system 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 />.

b. With one channel of Station Vent Normal Range Radiation Monitoring instrumentation inonerable. restore the inonerable channel to OPERABLE status within 7 days. or within the following I hour. isolate the control room normal ventilation system and niace at leastanc control room emergency ventilation system train in oneration.

c. With both channels of Station Vent Normal Range Radiation Monitoring instrumentation inonerableavithin I hour. isolate the control room normal ventilation system and placc;tticast l ODerontrol rnom emergency ventilation system train in operation.

SURVEILLANCE REOUIREMENTS i

4.7.6.1 Each control room emergency ventilation system shall be demonstrated OPERABLE. l I

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 control room air temperatre is less than or equal to 110*F when the control room emergency ventilation system is operating.

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b. At least once per 31 days on a STAGGERED TEST BASIS by initiating, from the control room, flow through the llEPA filters and charcoal adsorbers and verifying ,

I that the system operates for at least 15 minutes.

c. 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 1 in any ventilation zone communicating with the system by:

j DAVIS-BESSE, UNIT 1 3/4 7-17 Amendment No. 135,155, 9704300091 97041g F PDH ADOCK 05000346 F P pg g

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LAR 97-0005 .

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$ ADDIT!0 MAL CHANGES PREVIOUSLY PLANT SYSTErdS PROPOSED BY LETTER l

Scrial No. 2. 3 8 3 Dde 9/t7/9k i SURVEILL ANCE 1[EOUIREMENTS (Continued)

1. Verifying that the cleanup system satisfies the in-place penetration and bypass leakage testing acceptance criteria ofless than 1% and uses the test procedure guidance in Regulatory Positions C.5.a, C.5.c and C.S.d of Regulatory Guide 1.52, Revision 2, March 1978, and the system flow rate is 3300 cfm 10%;

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, for a methyliodide penetration ofless than 1 %; and

3. Verifying a system flow rate of 3300 cfm *10% during system operation when tested in accordance with ANSI N510-1980.

d. 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 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, for a methyliodide penetration ofless than 1%.

e. At least once per 18 months by:

1. Verifying that the pressure drop across the combirmd IIEPA filters and charcoal adsorber banks is less than 4.4 inches Water Gauge while operating the system at a flow rate of 3300 cfm *10%;

2. Verifying that the control room normal ventilation system is isolated by a SFAS test signal and a Station Vent Nomial Range _ Radiation Monitoring Radiation High-test signal; and

• The test is performed in accordance with ASTM D 3803-1979 with the following conditions: 1) equilibrate for 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> at 30 C/70% relative humidity (RH),2) cl'allenge for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at 30 C/70% RH,3) elution for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at 30 C/70% RH.

DAVIS-BESSE, UNIT 1 3/4 7-18 Amendment No. 134,135,155,209,

/ Sh"" HIS PAGE PROVIDED PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

3. Verifying that the makeup flow of the system is 300 cfm i 10% [

when supplying the control room with outside air.

f. Af ter each complete or partial replacement of a HEPA filter bank, by verifying th>tt the cleanup system satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than 1% in accordance with ANSI N510-1980 for a 00P test aerosol while operating the system at a flow rate of 3300 cfm i 10%.

g. After each complete or partial replacement of a charcoal adsorber bank, by verifying that the cleanup system satisfies the in-place penetration and bypass leakage testing acceptance criteria of less than 1% in accordance with ANSI N510-1980 for a halogenated hydro-carbon refrigerant test gas while operating the system at a flow rate of 3300 cfm 1 10%.

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. DAVIS-BESSE, UNIT 1 3/4 7-19 Amendment No.155 l

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THIS PAGE PROVIDED '

FORINFORMAIl0N ONIY l PLANT SYSTENS -

_B AS ES the flow path can be established. The ability for local, manuel l operation la demonstrated by verifying the presence of the handvheels for j all manual valves and the presence of either handvheels or available '

power supply for motor operated valves.

3/4.7.2 STEAN CENERATOR P,RESSURE/TD(PERATURE LIMITATION I The limitation on steam generator prergure and temperature ensures

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j that the pressure induced stresses in the steam generators do not l exceed the maximum allovable fracture toughness stress limits. The limitaticus of 110*F and 237 psig are based on a steam generator RT NDT of 40*F and are sufficient :o prevent brittle fracture.

3/4.7.3 COMPONENT COOLIhC VATER SYSTDI )

l The OPERABILITY of the component cooling vater system ensurer that sufficient cor ting capacity is available for continued operation of l safety reinted-equipment during normal and accident conditions. The redundan' t cooling capacity of this system, assuming a single failure, is consistent with the assumptions used in the safety analyses.

3/4.7.4 SERVICE WATER SYSTEM The OPERABILITY i of the service water system ensures that sufficicut cooling capacity is available for continued operation of safety related equipment during normal'and accident conditions. The redundant coolir;g capacity of this system, assuming a single failure, is consistent with ,

the assumptions used in the safety analysgs; 3/4.7.5 ULTIMATE HEAT SINK l The limitations on the ultimate heat sink Jevel and temperature l ensure that sufficient cooling capacity is available to either 1) provide i normal cooldown of the facility, or 2) to mitigate the effects of accident conditions within acceptable limits.

> The limitations on minimum vater level and maximum temperature are based on providing a 30 day cooling water supply to safety related equipment without exceeding their design basis tec:perature and is ,

consistent with the recommendations of Regulatory Guide 1.27, " Ultimate Heat Sink for Nuclear Plants" Harch 1974. '

3/4.7.6 CONTROL ROOM EMERCENCY VENTILATION SYSTEM 1

The OPERABILITY of the control room emergency ventilation system ensures that 1) the ambient air temperature does not exceed the allowable temperature for continuous duty rating for the equipment and instrmentation cooled by this system and 2) the control room vill remain habitable for operations personnel during and following all credible accident conditions. The OPERABILITY of this system in conjunction with control room design provisions is 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 50.

DAVIS-BESSE. UNIT I B 3/4 7-4 Amendment No.103

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. s f LAR 97-0005' Page 12 e

, PLANT SYSTEh.iS A

IlASES The Station Vent Normal _ Range Radiation Monitoring isolation function provides that under the required conditions. an isolation signal will be given. The Station Vent Normal Range Radiation Monitors provide isolation und shutdown of the control room normal ventilation system.

With one channel of Station Vent Normal Range Radiation Monitoring instrtunentation inuoerable for greater than 7 days. or with both channels of Station Vent Normal Range Radiation Monitoring instrumentation inoperable. the control room ventilation systems must_bc placedjnAstalc.cquiyalent to that which occurs after the higluadiation isolation has occurred; the contrni room normal ventilation system is isolated and the_ control room emergency yentilation system is placedjn_oneration. Plant operation can continue indefinitely in 11 tis state.

pmyided.that controlinomicmperature can be maintained irlan acceptable range. with the control room emergency ventilation system obtaining fresh-air makeup as described in the LipdaicLSafety_ Analysis Report Section 9.4.1. " Control Room."

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l DAylS-BESSE. UNIT 1. B 3/4 7-4a AmCDdnient No.

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