ML20052B218

Updated LER 79-021/01X-1:on 790918,during Surveillance Testing Min Flow Valve (MOV 2009) for Rgr (LPCI) Pumps 1P-229A & 1P-229C Failed to Open.Caused by Stripped Operator Worm Gear.Worm,Gear,Quad Rings & O Rings Replaced

ML20052B218
Person / Time
Site:	Duane Arnold
Issue date:	04/23/1982
From:	Hill K IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052B211	List: ML20052B210 ML20052B218
References
LER-79-021-01X, LER-79-21-1X, NUDOCS 8204300178
Download: ML20052B218 (2)

Text

_

U. S. NUCLEA'l EEIULATo;Y CCAdad:SSAQN tac POIM 'A4 n.m

• UPDATE REPORT LICENSEE EVENT REPORT

,' PREVIOUS REPORT DATE: 10-2-79 CoaTaot stoCx: 1 1 i i l i l irs Asa mMT on tv d Au. accuineo =rcauArioni i e@

10181l I. 4 9 IIA WCAN188 10 l ACOC4 IC 11ed!@l 0101 88 lololololol WC4h84Poua84&a l o l oIS l@l 24 a luCart44 t l i l7784 fl'1dol@lli saf sd l@

Con ~r Io!iI I 8

",C","C 1@l0el15 l0 CCCAST to to 1013 Nwm482 I 3 ! I.el@l 019I 89 118I tvtNT Qaf t 7I 9@l 01412I 1 fl 318121@

stPCa7Catt do avENT essCaierics Ano **ceAst.1CONSEcutNCES h

[ o_L2_j IDurino surveillance testino the minimum flow valve (MOV 2009) for RHR (L I (5TD IPCI) pumps IP-229A and IP-229C would not open. The pumps were declared i i f5T71 Inonerable and reonired surveillance testino bacun. A 7 dav I C0 was enter I lo ! s t led as per Tech Spec Section 3.5. A.S. Subsequent testing on 9/21/79 demon I lo is i lstrated both pumps could meet head and flow requirements with M0V 2009 i I Io iiI i n the open position. MOV 2009 was, therefore, secured in the open posi i i 2 s a i i tion and the pumps dnclared operable, endino the 7 day LCO. a I

CE COct $4 C 4 CCM*CNGNT COCS $yg OOg Ju g t o ! 91 l C l Fl@ (_Ej@ [B_J@ IV l A I L I V I 01 P l$ l Al@20Q @ se is f 8 S to si 2 e3 mtPCMT mgvisiCN

.tytNTvtAA

- SECutNTTAL CCCURmtNCE gpieo REPCAT NO. COCS TV't NQ.

@ ,a,,fgr 17I91 l-l 10121 11 (gj 10l1l L)LJ

o I, ! I11

_ 2, a :2 2 2. 2, a a 2 2:

E'M '."CW"! #!L*'r 5':4Wa" .Cu.s C,'%.. "1"A5"'- J5"0R'I . t l0 10 10 (IT) lE) ^,Ut&"u' l A j@ l L I 210l 0lg la '@lz l@

22 2 lZ!@

s lz!@

a 2i .o l Yl@ IN

.. 2 l@ 2 u 4r CAUSE DE5calPTICN ANo COAaEC 1VE AC 1CNS h i i 8 o i IDisassomhlv nf thn 1 imitnrnon (FR-000 valvn nnnratnr envnalnd t hn nnerat t

liti l for worn ocar was strioned. Subseonent nyamination nf worm onar and worm i

ii .>i Ibv manuf. determined desion flaw not causo. Unrn. worm coar. nuad rinns Iii:l land 0 rinos rer: laced and nears alioned prior to returnino operator to se  !

ti,4 1 trvice. Operator insnected durino 1981_ r/f outage. No problems found.  !

so s aa 17 %scwem CTWGASTATV5 5 A CisCOv t my :E sCaiPPCM l'isl[r_j@ !0!5l?!@l '

NA l l B !@l Surveillance Test "

I 8.CTivir , C:fre r

' '2 "

sitgAlt AMCVNT CF .CTivsTY LOCAftCN CF 8tLEASE I

l, i i s. I L.2j @3 L,o 08 8tLI e, A58Zj@l NA I l NA u

• *ta5ON*tL f s PC148(3 Noo.l. r..t li t ri lo l 010 @l zl@letse.,,,c @ N A l

• te$CNNE e4Ju'it3 wuusta :g3Cm'8T1CN NA  !

li 6 41 1010 ! 01@l si ,, a t ss e, C." "e.' ". Coo ..Ciun g

, , ,i [y'g; ng 8 2 0 4 3 0 c

, t 7 g ' i a 9 io so evauci" NaC U$E CNLY

• 1:ut: O E SCa e#TrCN .

W W@(

P 8 9 to NA l et 89 lIIIIIIIII II f.

So

• 5 NauteseaseAata Kimuel L. Hill ,,ey g, 319-251-5 m j

( .

DUANE ARN0LD ENERGY CENTER Iowa Electric Light and Power Company LICENSEE EVENT REPORT-Supplemental Data Docket No. 050-0331 Licensee Event Update Report Date: 4-23-82 Reportable Occurrence No: 79-021 Event Description During surveillance testing the minimum flow valve (MOV 2009) for RHR (LPCI) pumps IP-229A and IP-229C would not open. The pumps were declared inoperable and required surveillance testing begun. A seven day LC0 was entered as per Tech. Spec. Section 3.5.A.5. Subsequent testing on September 21, 1979 demonstrated both pumps could meet head and flow requirements with M0V 2009 in the open position. MOV 2009 was, therefore, secured in the open position and the pumps declared operable, ending the seven day LCO. There have been no previous similar occurrences.

Cause Description Disassembly of Limitorque SMB-000 valve operator revealed the operator worm gear was stripped. Cause unknown.

Corrective Action The worm and worm gear were forwarded to Limitorque Corp. for examination of wear.

Their evaluation determined that wear was not caused by improper design. The worm, worm gear, quad rings and 0 rings were replaced to return the operator to operation.

A slight misalignment of the gears noticed during operator disassembly, not believed to be responsible for worm gear wear, was corrected. A higher quality lubricant was used during reassembly of the operator. The operator was inspected during the 1981 refueling outage and no problems were found. In addition a sample of similar valves were inspected during the 1981 refueling outage with no similar wear problems found.

No additional corrective action is planned.

Page 1 _ of 1 l

. . .....b