ML20101H505

Proposed TS Bases 3/4.4.11 Re High Point Vents

ML20101H505
Person / Time
Site:	Davis Besse
Issue date:	06/26/1992
From:	CENTERIOR ENERGY
To:
Shared Package
ML20101H502	List: ML20101H500 ML20101H505
References
NUDOCS 9206300002
Download: ML20101H505 (4)

Text

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Docket Number 50-346 License Number NPF-3

' ' 8erial Number 2046 ADDili0NAL CHMiC[S P4lWO'JMt~~ ~I Attachment PROPOSED By page 1 krial%1Qg( ynrggggg3

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REACTOR COOLANT SYSTEM

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=1 REACTOR COOLANT SYSTER VE!GS ,

LIMITING CONDITION FOR OPERATION

.i j3.4.11 The following reactor coolant system vent paths shall be operable

a. Reactor Coolant System Loop 1 vith vent path through valves RC 4608A

!l and RC 46088.

o N b. Reactor Coolant Systen Loop 2 with vent path through valves RC 4610A J and RC 46108.

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i Pressurisert with vent path through EITHER valves RC11 and RC 2A (PORV) l OR valves RC 239A and RC 200. _ _

) APPLICABILITY: Modes 1. 2 and 3 ACTION:

a.- Vith one of the above vent paths inoperable, restore the inoperable vent path to OPERABLE status within 30 days, or, be in HOT STAND 5Y j vithin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHtffDOWN 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 OPERABLE 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 HOT STANDBY vithin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in BOT SEUTDOW vithin the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

d 1 c. Vith three of the above vent paths inoperable, restore at l ast two of j the inoperable vent paths to OPERABLE status within 71 hours8.217593e-4 days <br />0.0197 hours <br />1.173942e-4 weeks <br />2.70155e-5 months <br /> or be in.

9 j 4 HOT STANDBY vithin 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHtffD0VN vithin=the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. *

d. The provisions of specification 3.0.4 are not applicable.

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, SURVEILLANCE REQUIREMENTS

,orgE l 4.4 11 Each reactor coolant system vent path shall be demonstrated OPERABLE at least once per 18 months bys fj 0- I p, j 1. Verifying all manual-isolation valves in each. vent path are locked in bo  ; the OPen position,-and-

2. Cycling each valve in the vent path through at least one complete cycle of full travel from the control room during COLD SHUTDOVN or REFUELING, and OE  : 3. Verifying flov through the reactor coolant vent system vent paths ELL during COLD SBUTDOVW or REFUELING.

DAVIS-BESSE, UNIT 1- 3/4 4 32 Amendment No. /gf ,135

DocLet Number 50-346 License Number NPF-3 Serial Nuraber 2046 Attachment Pye 2 REACTOR COOLANT SYS.'IM l

! BASES l

2/4.e.10 STRUCTURAL INTEGRITY The inspection programs for ASME Code Class 1, 2 and 3 components, except steam generator tubes, ensure that the structural integrity of these components will be maintained 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 Vessel Code.

The internals vent valves are provided to relieve the pressure generated .

by steaming in the core following a LOCA so that the core remains suffi-ciently covered. Inspection and manual actuation of the internals vent 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.

bM0li POINT VENTS The Reactor Coolant System 7tgh N

int vents are nstait per NUREG-0737 item II.B.1 requirements. The opera 'ty:s;rf t e system ensares capability of venting steam or noncondgasatriM bubblh-thqreactor cooling system to restore natur1T~ circulation following a small bTeak 1.osa of coolant acettfEnt.

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DAVIS-EESSE, UNIT 1 B 3/4 4-13 Amendment No. 85

Docket Number 50-346

.' License Numbet NPF-3

, Serial Number 2046 Attachment Page 3 3/4.4.11 REACTOR COOLANT SYSTEM VENTS The OPERABILITY of the reactor coolant system (RCS) vent paths (installed per NUREG-0737. Item II.B.1 requirements) ensures the capability of venting steam or noncondensable gas bubbles in the reactor cooling system to restore natural circulation following a small break loss-of-coolant accident.

The OPERABILITY of the pilot-operated relief valve (P9RV) flow path (through >

valves RC 11 and RC 2A) ensures the availability of a relief path during the l off design basis " feed and bleed" mode of core cooling in the unlikely event i of a total loss of all feedvater.  ;

The OPERABILITY 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 depressurizing the RCs in the event of a steam generator tube rupture or natural circulation cooldovn. j 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.

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Docket Number 50-366 Licence Number NPF-3

, ., Serial Number 2046

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