ML20035B321

Proposed TS 3/4.6.4 Limiting Periodic Cycle Testing of Suppression chamber-drywell Vacuum Breakers to Cold Shutdown Conditions & to Require All 12 Installed Vacuum Breakers to Be Inoperable Instead of Current 10 Operable Breakers

ML20035B321
Person / Time
Site:	Fermi
Issue date:	03/23/1993
From:	DETROIT EDISON CO.
To:
Shared Package
ML20035B305	List: ML20035B321 NRC-93-0032, Application for Amend to License NPF-43,changing TS to Limit Periodic Full Cycle Testing of Suppression chamber-drywell Vacuum Breakers to Cold Shutdown Conditions & to Require All 12 Installed Vacuum Breakers to Be Operable
References
NUDOCS 9304010193
Download: ML20035B321 (2)

Text

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CONTAINMENT SYSTEMS 3/4.6.4 VACUUM RELIEF SUPPRESSION CHAMBER - DRYWELL VACUUM BREAKERS g

LIMITING CONDITION FOR OPERATION 3.E.4.1 All suppression chamber - drywell vacuum breakers shall be closed and' OPERABLE.

j APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

i a.

With one of the above required vacuum breakers inoperable for opening but known to be closed, restore the inoperable vacuum breaker 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 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 />.

b.

With one or more suppression chamber - drywell vacuum breakers open, close the open vacuum breaker (s) within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 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 of the position indicators of any suppression chamber -

drywell vacuum breakers inoperable, verify that all other vacuum breakers are closed within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and:

1.

Verify the vacuum breaker (s) with the inoperable position indicator to be closed by demonstrating the other indicator to be OPERABLE 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 14 days thereafter, or 2.

Verify the vacuum breaker (s) with the inoperable position indicator to be closed by conducting a test which I

demonstrates that the drywell-to-suppression chamber AP is maintained at greater than or equal to 0.5 psi for one hour 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 14 days thereafter.

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 />.

d.

With one of the closed position indicators of one or more suppression chamber - drywell vacuum breakar(s) indicating open

'i and the redundant closed position indicator indicating closed after a suppression chamber - drywell vacuum breaker opening as a result of a steam release, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, cycle the applicable valve (s) to determine which of the redundant indicators is OPERABLE..

9304010193 930323 PER AcihCK OtH)D0341 P

PDR FERMI - UNIT 2 3/4 6-48 Amendrent No. 77, jf.-

j i

i

~

e CQNTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS 4.6.4.1 Each suppression chamber - drywell vacuum breaker shall be:

a.

Verified closed at least once per 7 days.

b.

Demonstrated OPERABLE:

1.

During each COLD SHUTDOWN, if not performed within the previous 92 days, and within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after any discharge of' steam to the suppression enamber from the safety / relief-valves by:

a)

Cycling each vacuum breaker through at least one complete cycle of full travel.

b)

Verifying both position indicators OPERABLE by observing expected valve movement during the cycling test.

l 2.

At least once per 18 months by;

[

a)

Verifying the opening setpoint, from the closed position, to be less than or equal to 0.5 psid, and b)

Verifying both position indicators OPERABLE by performance of a CHANNEL CALIBRATION.

c)

Verify the opening gap for switch actuation to be less than or equal to 0.03 inches.

FERMI - UNIT 2 3/4 6-49 Amendment No.

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