ML20079A950

Proposed Tech Specs Revising Leak Test Frequency for Valves W/Resilient Seals

ML20079A950
Person / Time
Site:	Vogtle
Issue date:	12/27/1994
From:	GEORGIA POWER CO.
To:
Shared Package
ML20079A943	List: ML20079A941 ML20079A950
References
NUDOCS 9501040201
Download: ML20079A950 (2)

Text

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CONTAINMENT SYSTEMS

_ SURVEILLANCE REQUIREMENTS (Continued) dg 9 cak te fue M 9 0d hy) 4.6.1.7.2 At.leasteponc. :::.'2:

W:rsk the containment purge valves with exhaust penetration shall be demonstrated OPER measured penetration leakage rate is less than 0.06 L, when pressurized 4.6.1.7.3 ,.

(HV-2626B, HV-26278, HV-26288, HV-2629B) open shall t in accordance with Specification 3.6.1.7b at least once per 31 days t

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V0GTLE UNITS - 1 & 2 3/4 6-12 95o1040201 941227 PDR ADOCK 05000424 P PDR

CONTAINMENT SYSTEMS BASES CONTAINMENT VENTILATION SYSTEM (Continued)

The use of the containment purge lines is restricted to the 14-inch purge supply and exhaust isolation valves since, unlike the 24-inch valves, the 14-inch valves are capable of closing during a LOCA or steam line break accident. There- I fore, the SITE BOUNDARY dose guideline of 10 CFR Part 100 would not be. exceeded l in the event of an accident during containment PURGING operation. Only safety--

related reasons; e.g., containment pressure control or the reduction of air-borne radioactivity to facilitate personnel access for surveillance and main-tenance activities, should be used to justify the opening of these isolation valves.

Leakage integrity tests with a maximum allowable leakage rate for containment purge supply and exhaust supply valves _i'i p...b ::-S' '-dit:ti-- -' 7::i"::t

t:r hi :::1 f:;--ditie : d will allow opportunity for repair before gross leak-age failures could develop. The 0.60 L leakage limit of Specification 3.6.1.2b.

shall not be exceeded when the leakage fates determined by the leakage. integrity l tests of these valves are added to the previously determined total for all valves '

and penetrations subject to Type 8 and C tests.

3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS 3/4.6.2.1 CONTAINMENT SPRAY SYSTEM The OPERABILITY of the Containment Spray System ensures that containment depressurization and cooling capability will be available in the event of a LOCA or steam line break. The pressure reduction and resultant lower containment leakage rate are consistent with the assumptions used in the safety analyses.

The Containment Spray System and the Containment Cooling System both provide post-accident cooling of the containment atmosphere. However, the Containment Spray System also provides a mechanism for removing iodine from the containment atmosphere and therefore the time requirements for restoring an inoperable Spray System to OPERABLE status have been maintained consistent with that assigned other inoperable ESF equipment.

3/4.6.2.2 SPRAY ADDITIVE SYSTEM The OPERA 8ILITY of the Spray Additive System ensures that sufficient NaOH is added to the containment spray in the event of a LOCA. The limits on NaOH volume and concentration ensure a pH value of between 8.0 and 10.5 for the solution recirculated within containment after a LOCA. This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components. The solution volume limits (3700-4000 gallons) represent the required solution to be delivered (i.e., the delivered solution volume is that volume above the tank discharge). These assumptions are consistent with the iodine removal efficiency assumed in the safety analyses.

V0GTLE UNITS - 1 & 2 B 3/4 6-3

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