05000335/LER-1980-067-01, Discovered That Some Reactor Trip Breakers Would Not Trip on Undervoltage.Caused by Redundant UV & Shunt Trip Devices Not Tripping or Tripping Sluggishly.Device Armature Realigned

Discovered That Some Reactor Trip Breakers Would Not Trip on Undervoltage.Caused by Redundant UV & Shunt Trip Devices Not Tripping or Tripping Sluggishly.Device Armature Realigned

ML17266A394
Person / Time
Site:	Saint Lucie
Issue date:	01/16/1981
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A615	List: 05000335/LER-1980-067, Forwards Updated LER 80-067/01X-1 05000335/LER-1980-067-01, Discovered That Some Reactor Trip Breakers Would Not Trip on Undervoltage.Caused by Redundant UV & Shunt Trip Devices Not Tripping or Tripping Sluggishly.Device Armature Realigned
References
LER-80-067-01X, LER-80-67-1X, NUDOCS 8102030619
Download: ML17266A394 (2)

LER-1980-067, Discovered That Some Reactor Trip Breakers Would Not Trip on Undervoltage.Caused by Redundant UV & Shunt Trip Devices Not Tripping or Tripping Sluggishly.Device Armature Realigned

Event date:
Report date:
3351980067R01 - NRC Website

text

eDATE REPORT - PREVIOUS R

RT DATE DECEMBER 15, 1980 NRC POAM SSS IT.773 LICENSEE EVEi4T RCPORT U S NUC'LEAR AECULATORVCOAIMISSION CON'T

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Af?QATQAT9 30 EVENT OESCAIPTION 'NO PROBABI E CONSEOUENCES QIQ Durin normal full ower o eration it was dis ov d

trip breakers would not tri on undervolta e

UV as ex ected.

The tri s

breakers have redundant UV and shunt tri devices.

One device would not trip and two others tripped sluggishly.

The ability of the reactor to trip either manually or upon RPS signal was not compromised as evidenced by an unrelated plant trip which occurred durin this investi ation. This is being reported per tech s ec 6.9. 1.8.i. This is 1st LER of this t e.

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UV coils independantly on a monthly basis.,

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