ML20052F028

LER 82-026/03L-0:on 820407,MSIV Leakage Control Sys (MSIV-LCS),pressure Switch PS-8404C Failed,Rendering Sys Inoperable.Caused by Corrosion on Terminal Strip.Terminal Strip Cleaned & Lubricated

ML20052F028
Person / Time
Site:	Duane Arnold
Issue date:	05/05/1982
From:	Hill K IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052F025	List: ML20052F024 ML20052F028
References
LER-82-026-03L, LER-82-26-3L, NUDOCS 8205110646
Download: ML20052F028 (1)

Text

- -

NAC 8tente 30s U.s.NUCLsAR RYULATCRY CcesassanaQ8e

. (F 771 LICENSEE EVENT REPORT CONTROL StoCE: l l l l l l (ptgAsa PRINT oR TYad ALL REQUIREO ImponeAA'-ON) fiTri l ria lo la ic li igl 0 l 01_l o l o lucansemuness o l o l o l _ l o l oT @lasa i ucsass t 111111 rves w @LQ-s se@

e. uca ecaos i. is Core"T lolil 8

d,c

" '"' l L )@l0 15 10 10 l01313111@l0l4l017l occagTNuaselm 88 86 SVENT oat t 8l 2@l0151

3. 79 O f 3l 8121@

AEPoRTo4T3 40 8 de si avsNT ossCnierioN ANo amosasLa CoNunousNCES Q io lai l During cold shutdown while performing surveillance testing of the main s 1 F5Tn I team isolation valve-leakage control system (MSIV-LCS), main steam line I Lo_u,j i pressure switch PS-8404C failed, rendering the MSIV-LCS on the "C" main i Io !s1 I steam line inoperable. Following manual system initiation, PS-8404C reis  !

Io is 1 I olates "C" steam line LCS if steam line pressure has not decayed to less 1 10171 I than 5 psia in one minute. System operability required by Tech. Spec. 3. I Io is i I 7.E. No similar previous occurrer:ces. Problem not aeneric. I so E SUSCooE CJMpoMSNT Cood SUSCo.E SW E loISI lC l Di@ y@ lD l@ lI lN l S lT l Rl Ul@ W@ @

,, i ,, ,. .. .

EVENTYE'" 7 TY'S

@ ,"timino

,tg,; l2,8l2l a

n l-l n L.,01 2

21 6ls.

l/l u

10l3l a a lLl a

[-l 1

n

^U.'ltr,tr ..","ot.. c ""n;#I.,

W#" ?cWla o!.'t,' fir 'Tr", T' u.. 22 ",'u"/.s=".7 .

[p_j@l Z l@ l010l0gl l [N,,j @ lNlg y @ lBl0l7l0[g n 2 lZ 2s l@ LZJ@ a 21 .i o a .,

CAust oESCRIPT1oN ANo CommECTtvt ACTtoNs 27 Ii!a l l Failure of PS-8404C was due to slight corrosion on its terminal strip wh I ii t i 1 I ich resulted in a poor electrical connection. The pressure switch and te i mI rminal strip were cleaned and lubricated to prevent further corrosion. T l gi he pressure switch was functionally tested satisfactory. No further corr i mI ective action is planned. I a 3 so ST.N 4 ous4R ofteen STATUS Scow v ot ERY .4SCRIPvt9M m LGj@ l 010l 0]@l NA l W@l Surveillance Tst [

' '2 " ** * * "

' .!nvin co'!r ~1

.eciase tocanon on .e6aAsa @

LQ,s_I L_Z.J LZ_j l NA

@o amou=ron .cnvin on.ec:ase' @

l NA l i

..o '.'. . .@3. , " * "

,u . n. ...c.,,rio I'rT71 10 10 10 l@LZ_.J@l NA l

,.. o .",mu',!,is "

wu et. ot SCAT PT1.a.

8, 10 .. l010 l@l NA ,, n ,,

l

'#.

• U.'c".',*r'o? '" @

' 9 y @l NA l 1 .. i. ,,

'u' ssueo c'e"sca,nio" o

8205110646 820503 Nac use oNLY PDR ADOCK 05000331 8r 'd, _j@l NA e io S PDR l a .,

l I I I I I I ! I I I I I:I N4=go,p.e,4 men Kimuel L. Hill ,,,oy , 319_.851-5611 I