ML20086P983

Proposed Tech Spec Bases 3/4.4.11 Re High Point Vents

ML20086P983
Person / Time
Site:	Davis Besse
Issue date:	12/18/1991
From:	CENTERIOR ENERGY
To:
Shared Package
ML20086P980	List: ML20086P978 ML20086P983
References
NUDOCS 9112270308
Download: ML20086P983 (4)

Text

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Docket Number 50-346 License Number NPF-3 Serial Number 1970 i

.e Attachment

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REACTOR COOLANT SYSTEM ggggl' gy , ,

AEACTOR COOLANT SYSTEM VENTS  :

L7MITING CONDITION FOR OPERATION l 3.4.11 The following reactor coolant system vent paths shall be operable:

a. Reactor coolant Syster. Loop 1 with vent path through valves RC 4608A and RC 46088. ,

b. Reactor Coolant 53stes Loop 2 vith vent path through valves RC 4610A and RC 46108.

c. Pressurisers with vent path through EITIER-valves RC11 and RC 2A (PORef l OR valves RC 239A and RC 200.

APPLICABILITY: Modes 1, 2 and 3 l ACTION:  :

a. Vith one of the above vent paths inoperable, restore the inoperable vent path to OPERABLE status within 30 days, or, be in 50T STAND 87 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in 30T 55UTD0VN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. Vith two of the above vent paths inoperable, restore at least one of  ;

the inoperable vent paths to 0FERASLE 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 BOT STANDST within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in-ROT SElfrD0VN within the following 30 '

hours.

c. Vith three of the above vent paths inoperable, restore at least two of the inoperable vent paths to OPERABLE-status vithin 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in ,

-NOT STANDBY vithin .6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in 30T CEUTD0VN 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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l d. Tha provisions of specification 3.0.4 are not applicable. . >

SURVEILLANCE RE0UIRENEFFS 4.4 11 Each reactor coolant systen vent path shall be demonstrated OPERABLE at least once per 18 months by:

1. -Verifying all manual isolation valves in each vent path are locked-in-the open position, and

2. Cycling each-valve in the vent-path through at least one complete cycle of full travel from the control rogs during COLD SIUTDOWN or REFUELING, and

3. Verifying flow through the reactor coolant vant systen vent paths during COLD SRttrD0VN or REFUELING.

DAVIS-BESSR, IMIT 1- 3/4 4-32 Amandaant No. /85 el 35

pit e70308 911216

)PDR ADOCK 05000346 F,Drv p

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Docket Numt.sr 50-346 i License Number NPP-3  ;

e Serial Number 1970  !

e ment REACTOR COOLANT SYSTEM BASES  ;

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3/4.4.10 STRUCTURALINTbRITT --

l The inspection programs for ASME Code Class 1, 2 and 3 components, except I steam generator tubes, ensure that the structural integrity of these  ;

components will be naintained at an acceptable level throughout the life of the plant. To the extent applicable, the inspection program for these  !

components is in compliance with Section XI of the ASME Boiler and Pressure j r

Vessel Code. -

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The internals vent valves are provided to relieve the pressure generated by steasing in the core following a LOCA so that the core reeaina .sufft- .

ciently covered. Inspection and manual actuation of the internals vest-valves 1) ensure OPERABILITY, 2)' ensure that, the valves are not stuck open (

during normal operation, and 3) demonstrates that the valves are fully open at the forces equivalent to the differential pressures assumed in the:

safety analysis.

HIGH_ POINT VENTS , {

t The Reactor Coolent System vents are per NUREG-0737 t ites II.B.1 requirements. The opera -J.hteystes ensures capability of venting steam or nonco s G as bubbles in t r cooling ,

system to res ral circulation in11owing a small break  !

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. DAVIS-BESSE, UNIT 1- B 3/4 4-13 Amendment No. 85 y  %, , . - v --.-vt' + I--,-rt-*E---*---- *-r- ~ - - * < -- - - ~ * .

Docket Number 50-346

, License Number NPF-3' ,

Serial Number 1970 l Ajtachment Pagt 3 3/4.4.11 REACTOR COOLANT SYSTEH VENTS r

l The OPERABILITY of the teactor coolant system (RCS) vent paths (installed per I NllREG 0737. Item 11.D.1 requirements) ensures the capability of venting steam >

or noncondensable gas bubbles in the reactor cooling system to 1estore natural circulation following a small break loss-of-coolant accident.

The OPERABILITY of the pilot operated relief valve (PORV) flow path (through -;

valves RC 11 and RC 2A) ensures the availability of a relief path during the  !

off design basis " feed and bleed" mode of core cooling in the unlikely event of a total loss of all feedvater.

The OPEl(ADILITY of a pressurizer vent path (through either valves RC 11 and RC 2A, or valves RC 239A and RC 200) ensures the availability of an alternate means of deptessurizing the RCS in the event of a steam generator tube rupture ,

or natural circulation cooldown, and also ensures the capability of '

derressutizing the RCS during a serious station fire.

The OPERABILITY of the PORV flow path (valves RC 11 and RC 2A) ensures that challenges to the pressurizer code safety valves vill be minimized, and provides an alternate means of limiting RCS pressure excursions. In the event of excessive seat leakage of the PORV (RC 2A), or a stuck open PORV.-the OPERABILITY of the PORV block valve (RC 11) provides a means of isolating the .

PORV flow path, i I

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Docket Number 50-346 License Number NPP-3

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