ML17277B771

Proposed Tech Specs Limiting Condition for Operation to Seven of Nine Pairs of Suppression Chamber Drywell Vacuum Breakers Operable & All Nine Pairs Closed

ML17277B771
Person / Time
Site:	Columbia
Issue date:	05/30/1985
From:	WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML17277B770	List: ML17277B769 ML17277B771
References
TAC-59793, NUDOCS 8506050425
Download: ML17277B771 (5)

Text

CONTAINMENT SYSTEHS 3/4. 6. 4 VACUUH RELIEF SUPPRESSION CHAMBER - DRYWELL VACUUM BREAKERS LIMITING CONDITION FOR OPERATION g~~~g Op ~a N)NS -VA>gs 3.6.4.1/>>'ach-p~ of suppression chamber - drywell vacuum breakers shall be OPERABLE and~ed ALL NINa PhigS SAQLL 86 <LO569.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

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. With one or more vacuum breakers in)mme oaf+of suppression chamber "

drywell vacuum breakers inoperable for openin ut known to be closed, restore the inoperable paiQof vacuum breakers 'hf 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 at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in,,COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

$ '. C. With one suppressioj'~chamber - drywell vacuum breaker open, verify the other vacuum breaker in the pair to be closed within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />; restore the open vacuum. breaker to the closed position within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLO SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

CLOSeD - drywall Qd. With oneIposition indicator of~any suppression chamber vacuum breaker inoperable: 4~+

1. Verify the other vacuum breaker in the pair to be closed within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and at least once per"15 days thereafter, or

2. Verify the vacuum breaker(s) with the inoperable position indicator to be closed by conducting a test which demonstrates that the DP is maintained at greater than or equal to '0.5 psi for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> without makeup within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and at least once per 15 days thereafter.

3. Otherwise, be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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COHTAIHMEHT SYSTE MS SURVEILLANCE RE UIREMENTS 4.6.4.1 Each suppression chamber - drywell vacuum breaker shall be:

Verified c1osed at least once per 7 days(PPCtARDl.KSS 6P Oi Se~SSU~y)

Demonstrated OPERABLE:

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At least once parfait-days-and-ssttnis~ou~nen-'any

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2. At least once per ~days by verifying both position indicators OPERABLE by observing expected valve movement during the cycling test. e."~-

3. At least once per 18 months by; a} Verifying the opening setpoint, from the closed position, to be less than or~cequal to Oe5 psid, and s

b} Verifying both'position indicators OPERABLE by performance /f<".;;;

, of a CHANNEL"..CALIBRATIOH.

WASHINGTON NUCLEAR " UNIT 2 3/4 6-34

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CONTAINMENT SYSTEMS BASES OEPRESSURIZATION SYSTEMS (Continued)

Because of the large volume and thermal capacity of the suppression pool, the volume and temperature normally changes very slowly and monitoring these parameters daily i's sufficient to e'stablish any temperature trends. By requiring the suppression pool temperature to be frequently recorded during periods of significant heat. addition, the temperature trends will be closely followed so that appropriate action can be taken. The requirement for an external visual examination following any event where potentially high loadings could occur provides assurance that no significant damage was encountered.

In addition to the limits on temperature of~the suppression chamber pool water, operating procedures define the action .to>be taken in the event a safety/relief valve inadvertently opens or sticks open. As a minimum this action shall include: (1) use of all available means to close the valve, (2) initiate suppression pool water cooling, (3) initiate reactor shutdown, and (4) if other safety/relief valves are~used to depressurize the r eactor, their discharge shall be separated from'tpat of the stuck"open safety/relief valve to assure mixing and uniformity ofgenergy insertion to the pool.

3/4. 6. 3 PRIMARY CONTAINMENT ISOLATION VALVES The OPERABILITY of the primary containment isolation valves ensures that the containment atmosphere will~be isolated from the outside environment in the event of a release of radioactive material to the containment atmosphere or pressurization of the containment. Containment isolation within the time limits specified ensures for those isolation valves designed to close .auto-matically that the release of radioactive material to the 'environment will be consistent with the assumptions used in. the analyses for a LOCA.

3/4. 6. 4 VACUUM RELIEF Vacuum relief breakers are provided to equalize the pressure between the suppression chamber and drywell and between the reactor building and suppres-sion chamber. This system will maintain the structural integrity of the primary containment under conditions of large differential pressures.

The vacuum breakers between the suppression chamber and the drywell must not be inoperable in the open position since this would allow bypassing of the suppression pool in case of an accident. There are nine pairs of valves to provide redundancy and capacity so that operation may conti nue~~p-to >>dt~inikely

~ours with no more than ~ne pair<of vacuum breakers inoperable in the closed position.

+'Wo WASHINGTON NUCLEAR - UNIT 2 B 3/4 6-4