05000260/LER-1980-011-03, During Hot Shutdown, 480-volt Rmov Board 2B Failed to Transfer Properly During Manual Transfer.Caused by Dirty Moveable Contacts on Normal Breaker.Contacts Cleaned & Board Transferred

During Hot Shutdown, 480-volt Rmov Board 2B Failed to Transfer Properly During Manual Transfer.Caused by Dirty Moveable Contacts on Normal Breaker.Contacts Cleaned & Board Transferred

ML18025A850
Person / Time
Site:	Browns Ferry
Issue date:	05/09/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A849	List: 05000260/LER-1980-011, Forwards Updated LER 80-011/03L-1 05000260/LER-1980-011-03, During Hot Shutdown, 480-volt Rmov Board 2B Failed to Transfer Properly During Manual Transfer.Caused by Dirty Moveable Contacts on Normal Breaker.Contacts Cleaned & Board Transferred
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8005130615
Download: ML18025A850 (2)

LER-1980-011, During Hot Shutdown, 480-volt Rmov Board 2B Failed to Transfer Properly During Manual Transfer.Caused by Dirty Moveable Contacts on Normal Breaker.Contacts Cleaned & Board Transferred

Event date:
Report date:
2601980011R03 - NRC Website

text

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Update Report Previo s Report 3-17-80 U. S, NUCLFAR REQUI:frbTORY CI7MMISSION LICENSEE Elrgtr T IIEPCIITT 8 00GR 8 0 lfpI~

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GO Gl DOCKET NUMGEII GII 629 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROSASLE CONSEQUENCES O10

~03 transfer.

Board was immediately re-energizedl Pailure to transfer caused the

~O t ~os loss of RPS MG Set 2B.

Reference Technical Specification 3.5.B.1 (2) and 3.5.A.l (2) 480 V-RMOV Boards 2A, 2C, and 2D were available.

There was no danger to health or safety of the public.

No previous occurrences.

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Investi ation revealed board would transfer to alternate feed but not from~

1 alternate to normal.

This was caused b dirt moveable contacts on normal I

breaker.

Contacts were cleaned and board transferred ro erl This is a random failure.

control will consist of scheduled breaker main-4

.tenance ro ram resentl scheduled once an o eratin cycle.

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