05000280/LER-1979-002-03, /03L-0 on 790115:electrical Penetration Between Turbine Bldg & Emergency Switchgear Room Not Properly Sealed.Caused by Penetration Being Broken During Previous Implementation of Design Change

/03L-0 on 790115:electrical Penetration Between Turbine Bldg & Emergency Switchgear Room Not Properly Sealed.Caused by Penetration Being Broken During Previous Implementation of Design Change

ML18113A838
Person / Time
Site:	Surry
Issue date:	02/12/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A837	List: 05000280/LER-1979-002, Forwards LER 79-002/03L-0 05000280/LER-1979-002-03, /03L-0 on 790115:electrical Penetration Between Turbine Bldg & Emergency Switchgear Room Not Properly Sealed.Caused by Penetration Being Broken During Previous Implementation of Design Change
References
LER-79-002-03L-01, LER-79-2-3L-1, NUDOCS 7902200019
Download: ML18113A838 (2)

LER-1979-002, /03L-0 on 790115:electrical Penetration Between Turbine Bldg & Emergency Switchgear Room Not Properly Sealed.Caused by Penetration Being Broken During Previous Implementation of Design Change

Event date:
Report date:
2801979002R03 - NRC Website

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~~~rry Power" Station, Unite Docket No:

50-280 Report No:

79-002/0JL-0 Event Date:

1-15-79 Unsealed Electrical Penetration

1.

Description of Event

During normal power operation, operator observation revealed an electrical penetration between the turbine building and the emergency switchgear room which was not properly sealed.

This fire barrier penetration is also required to per-form a pressure sealing function.

This event is contrary to Technical Specification 4.18.H.2.

The health and safety of the general public were not affected.

2.

Probable Consequences and Status of Redundant Systems:

The operability of the emergency control rootn ventilation system was verified immediately upon discovery of the unsealed penetration.

3.

Cause

An investigation revealed that the seal on the electrical penetration had been broken during previous implementation of a station design change.

The penetration was never resealed.

4.

Immediate Corrective Action

The penetration was immediately resealed, and verified operable by local leakage testing.

5.

Scheduled Correc.tive Action:

The problem was corrected innnediately and no further action is anticipated.

6.

Action Taken to Prevent Recurrence:

Procedures have been generated for temporary and permanent sealing of fire barrier penetrations during construction or maintenance work.

In addition, the ongoing construction effort has been made aware of the necessity for resealing any penetrations violated during construction.

7.

Generic Implications:

None.