05000346/LER-1978-012-03, /03L-0:on 780124,personnel Airlock Failed Leak Rate Test.Caused by Loose Shaft Seal Due to Routine Use of Personnel & Escape Lock (Exit/Entry to Containment).Shaft Seals Tightened to Prevent Excessive Leakage

/03L-0:on 780124,personnel Airlock Failed Leak Rate Test.Caused by Loose Shaft Seal Due to Routine Use of Personnel & Escape Lock (Exit/Entry to Containment).Shaft Seals Tightened to Prevent Excessive Leakage

ML19329B082
Person / Time
Site:	Davis Besse
Issue date:	02/15/1978
From:	David Brown TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B077	List: 05000346/LER-1978-012, Forwards LER 78-012/03L-0 05000346/LER-1978-012-03, /03L-0:on 780124,personnel Airlock Failed Leak Rate Test.Caused by Loose Shaft Seal Due to Routine Use of Personnel & Escape Lock (Exit/Entry to Containment).Shaft Seals Tightened to Prevent Excessive Leakage
References
LER-78-012-03L, LER-78-12-3L, NUDOCS 8001300673
Download: ML19329B082 (3)

LER-1978-012, /03L-0:on 780124,personnel Airlock Failed Leak Rate Test.Caused by Loose Shaft Seal Due to Routine Use of Personnel & Escape Lock (Exit/Entry to Containment).Shaft Seals Tightened to Prevent Excessive Leakage

Event date:
Report date:
3461978012R03 - NRC Website

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";GuiT b?.3ER 94 6J Ev ENT GATg 74 EVENT DESCRIPTION AND PRCS ABLE CONSEC'.,ENCES h 13121 l Cn 1/21/73, the personnel airlock failed i:s leak race test.

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o ;3, ; the Action Statenent (A.S. ) of Tech Spec 3.6.1.3.

The leak was stopped and the unit l l o 14 I I recoved from the A.S. within seven hours.

On 1/25/78, the escape airlock failed its l l a ! 3, ; leak rate test, again placing the unit in the A.S. ot Tech Spec 3.6.1.3.

This leak [

[a ;g ; ; was also stopped, removing the unit from the A..S. within ten hours.

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3;7l l only the exterior door leaked excessively; the interior door maintained containment I io;g, ; integrity.

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tit 7!l shaft seals were ti2htened to erevent excessive leaks 2e.

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DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION (V

j SUPPLDIENTAL INFORMATION FOR LER NP-33-78-15 DATE OF EVENT:

January 24 and 25,.1978 FACILITY:

Davis-Besse Unit 1 IDENTIFICATION OF GCCURRENCE: Overall air lock leakage rate for personnel and escape lock exceeded Technical Specification limit.

Conditions Prior to Occurrence:

The unit was in Mode 1, with Power (MWT) = 2079 and Load-OCIE) = 700.

Description of Occurrence: 'At 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on January 24, 1978, during the perfor-mance of Surveillance Test, ST 5061.02, " Volumetric Leakage Test", for the per-sonnel lock, the leakage race exceeded the allowable leakage rate of Technical Specification 3.6.1.3.

This placed the unit in the Action Statement of Technical Specification 3.6.1.3,, which requires both containnent airlocks operable in Modes 1, 2, 3, and 4 Leakage was detected at the shaft seal on the lower handwheel of the exterior door.

O At 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on January 25, 1978, during the performance of the Volumetric

!\\s 'j Leakage Test, ST 5061.02, of the escape lock, the leakage race exceeded the allowable leakage rate of Technical Specification 3.6.1.3, placing the unit in the Action Statement of Technical Specification 3.6.1.3.

Leakage was detected at the shaft seal on the lower and upper handwheel of the exterior door.

Designation of Accarent Cause of Occurrence:

The apparent cause of this occur-rence is the shaft seal (teflon packing) loosened due to routine use of per-sonnel and escape lock (exit / entry to containment).

Analysis of Occurrence:

There was no danger to the health 2nd safety of the public or to unit personnel.

There was no leakage detected on the interior door on both the personnel and escape lock which would have prevented any leak-age from containment leaking to an outside area if containment isolation had been needed.

Corrective Action

The shaft seal of the lower exterio'r door handwheel on the personnel lock was tightened per Maintenance Work Crder 78-213 and the Volume-tric Leakage Test, ST 3061.02 was successfully completed at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> on Janu-ary 25, 1978.

This removed the unit from the Action Statement of Technical Specification 3.6.l.3.

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The shaft seals on the lower and upper exterier door handwheel on the escape t

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lock were tightened per Maintenance Work Order 78-219 and the Volumetric Leakage x.y l'

LER #78-012 l

1 TOLEDO EDISON CCMPANY I

DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL ITT00tATION FOR LER NP-33-78-L5 PAGE 2 4

Test was successfully completed at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on January 25, 1978.

This removeo che unit from the Action Statement of Technical Specification 3.6.1.3.

For both incidents, the test was completed well within the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ti=e re-i quirement of the Action Statement. Maintenance is investigating the replacement of the seals to prevent recurrence.

l Failure Data: There have been no previously reportable occurrences of excessive personnel hatch leakage.

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