05000259/LER-1981-055-03, /03L-0:on 810927,while Timing New Degraded Voltage Time Delay Relays,Contact on Diesel Generator C Start Relay Failed to Close When Relay Energized.Cause Not Given.Time Delay Relay Replaced

/03L-0:on 810927,while Timing New Degraded Voltage Time Delay Relays,Contact on Diesel Generator C Start Relay Failed to Close When Relay Energized.Cause Not Given.Time Delay Relay Replaced

ML20011B000
Person / Time
Site:	Browns Ferry
Issue date:	10/26/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A998	List: 05000259/LER-1981-055, Forwards LER 81-055/03L-0 05000259/LER-1981-055-03, /03L-0:on 810927,while Timing New Degraded Voltage Time Delay Relays,Contact on Diesel Generator C Start Relay Failed to Close When Relay Energized.Cause Not Given.Time Delay Relay Replaced
References
LER-81-055-03L-01, LER-81-55-3L-1, NUDOCS 8111030505
Download: ML20011B000 (2)

LER-1981-055, /03L-0:on 810927,while Timing New Degraded Voltage Time Delay Relays,Contact on Diesel Generator C Start Relay Failed to Close When Relay Energized.Cause Not Given.Time Delay Relay Replaced

Event date:
Report date:
2591981055R03 - NRC Website

text

NRC FORM 366 U S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL DLOCK: l l

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60 61 DOCK ET NUMBER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRtPTION AND PROBABLE CONSEQUENCES h -

I c i 2 i 'l With unit 1 in a refueling outage, unit 2 at 99% power and unit 3 at 96 percent powerg [o,3 g l while timing new degraded voltage time delay relays, a contact on diesel generator l

l O 14 l l C start relay 2-211-2C failed to close when the relay was energized. (T.S 3. 9. B.11) l IOIst [ Redundant shutdown boards and associated relays were available and operable. There 10 le l l was no danger to the health or safety of the public md tqurevious similar events.

l lcl7J [ The diesel generator p common to units 1 and 2.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Iil oil A contact on the time delay relay was not closing when thLrelav was er.argized. The I i ITTi l l Anastat model E7012PB001 time delay relay was replaced, and the re (re1ay was timed l

Ii l 21 1 and successfully tested. These time delay relays are functionally tested every six l

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li14 II further recurrence contrni is requited.

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/ 81055 T. chnical Specific.itiori in. h ed 3.9.B.11 hpor'.ed Under Tec hnic.d Specifie.i!Wn 6.7.2.b(2)

• p;, t e du s-E r.. 10/27/81 ilate of Ocet.rrence 9/27/F1 i'i:ne c.f Occu rrerm 1830 1 and 2 identification and l>escrip:--

. of ()ccurrence Vn11Triniinsiic' ~deiraded v.M t5ge 'tiitiedelaj relays, a contact on dit ss i generator C w

start relay 2-2112C failed to close wWn the relay was enc <gized.

' '. "h t ion s P: 'o r

, ' ' ' c u rence Unit 1 in refueling outage.

Unit 2 at 997..

Unit 3 at 96%.

Ac n :,pei:ified in t he T" inical specification Sn' cei.!ance Hequirements met to inoperab!e einapn:en t.

D.: scribe None Apparpnt Causr of ()J.. au.

A contact on the time dela, relay was not closing when the relay was energized.

A'Mvais of Occurrence the;- vac no danger to the health or saf_cy cf he public, no release of activity, no dv age to the plant or equipment, and no sulting signifiennt chain of events.

Ilurre,c:iye _Ac;ian :

The relay was replace.

and the new relay was timed and successfully tested. These time delay relays are iunctionally tested every 6 taonths per SI 4.9.A-4B and calibrated once a year per S1 4.9.A-4.c.

This is considered a random. failure and no further recurrence control is required.

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