ML20064H132

/03L-0 on 780612:during Steady State Oper,Noted That Drywell Atmospheric Temp Recorder TR-1-149 Was Inoperable.Recorder Failed Due to Failed Idler Assembly

ML20064H132
Person / Time
Site:	Vermont Yankee
Issue date:	07/24/1978
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20064H125	List: ML20064H124 ML20064H132
References
LER-78-021-03L, LER-78-21-3L, NUDOCS 7812180176
Download: ML20064H132 (2)

Text

.

.o.o u..L. o. A. .vuu.. - m e m , v. , u-. ...u.,

(7 77}

LICENSEE EVENT REPORT LER 78-21/3L CcNTact stcCx: l i

1 i I 1 I l@

intEAsf paint on Tve! Att aEQUIRED INFCRMATICN) o t ij lv I t l v !Y l s 11 l@l 01 ol -l 010l 010101 -101 01@l as 411l l' 11 1l@l uCassa rv., ao i

si af 3.4 Jg 7 i 2 uCtNssa C:ce i. :s uCaNsa wussa In C#. .

Io!ii ",' 'O "j l L @l 0 l 5 l0 l0 l0 l2 17 11 Ql 01 61 11 2l 7 l 8 Ql0

s 17ainoaT 12 l4:AT: 17 18aol@

' 3 eo ei CoCx aT Nuus sa +a se avaNT oafs 14 EVENT OESCRIPTION ANO PaCSA8t2 CONSECUENCES l o i 21 1 io,2i f See attached sheeC  !

l Io1Al l lo isi ! 1 Io is I l l 1o17{ l I I

1 a .91 1 so i ea COMP SV17tM CAu1E CAUSE vA ty g eeca Coce susC:cs C uecNENT Coca susCcca susCcca loIal r a lIID l@ W@ 13 l@ l Il Nl S l Tl Rl Ul@ lR l@ { @

9 to in 12 13 is is 20

_ SECUENTtAL CC00 p m ENCE asPCRT REVISION gga ao EVENT vt A R m EPCRT NO. COCE Tvet

@ 454g i 7I al l_l 10 !2 li l l-l l013l 3 3 lL l g l 22 l

_2n 22 23 24 26 27 OG 31 ACTICN ruTyng gastCT SHUTOCWN ATTACMutNT Np*C4 88198 Cove. COMPCNENT TAKI'd ACTICN CNet. ANT uETHOO acuRS $40MsTTED FCpu swe. syPpLign MANyFACTLptR l22a !@l24z l@ Iz!@

as II a

l@ 22 l 01 O! O 4o I

Q@ lYl@

ai 42 l42Ni@ lGIOl8101@

44 47 CAUSE CEscaleficN ANO CORAECTIVE ACTIONS h l

IiioIl

,,,,,; See acCached sheeC ,

I

, i?l l I

Ie i:t i li,4 il I 80

1. $ 'T **Cwtm

. OTHERSTATUS cis v OIS0cvERv CEscairTION i,,,,w @ 10n ni@i NA  ! li l@l = === = cdse n^t = 1

e g to 12 11 44 e5 46 ,,

ACTivlTw CONTENT agLgAsg ca mELE ASE AMOUNT CF ACTIVITY LOOATION 08RELIASI l1 !6l !

3 3 9 to 11 44 is 6 etesONNEL FmPC5uRES Nuestm Tv't CESCAIPTICN Ii!7!lolo!0j@ W @l NA

' ' ' nascNNe'L'iN;u'iss

'~

Ny'.* g( A C ESCRIPTIC N NA li t - dI 9l ol 01 o f@l12 F 11 I

LC13 CF Ca 049 ACE To F ACluTY Tv8f OESCAieTICN 1'i> I L:J8! NA

. 2 ,o ,,

• uBLICITv N AC USE CNov Of 3 cpi 871CN ,

• $$6(3 =

}7)a} l NA l l IIl!!!O I! !I $

y g 3 ig 64 69 83 E

' ~

NAME CF PREP A AER

• I* COU"*Y PwCNE:

78121801 %

• ..F VT77 S1 05000271 LER 78-21/3L

( EVE:T! DESCRI? TION A'iD PR03A3LE CONSEQUENCES During steady state operation, Control Room personnel observed the dryvell at=ospheric tenperature recorder, TR-1-149, to be inoperable.

This is one of two redundant drywell temperature recorders classified as' post-accident instrumentation by Technical Specifications Table 3.2.6 and is required for power operation. The redundant temperature recorder, 16-19-45, was available and operable. Investigation revealed a failed idler assembly in the recorder drive train. This event was identified on 7/5/78 while perforcing an in-house review of safety class mainte-nance activities. Similar events were reported as RO 76-30 and RO 78-16.

(R0 78-21/3L)

CAUSE DESCRI?T!ON AND CORRECTI'TE AC"'ICN f

- A General Electric Company Model SEG1A02011 recorder failed to operate due to a failed idler asse=bly. The main idler shaft and gear were replaced and the. recorder returned to service on 6/13/78. The re-corder will be replaced at the nex opportunity with one of a more re-liable design.

e i

l l

l l

r

_ ,,--.3 - _. __, , _ - - -