05000263/LER-1981-018-03, /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc

/03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc

ML20009E414
Person / Time
Site:	Monticello
Issue date:	07/20/1981
From:	Onnen M NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009E412	List: 05000263/LER-1981-018, Forwards LER 81-018/03L-0 05000263/LER-1981-018-03, /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc
References
LER-81-018-03L, LER-81-18-3L, NUDOCS 8107280177
Download: ML20009E414 (1)

LER-1981-018, /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc

Event date:
Report date:
2631981018R03 - NRC Website

text

a an,-

E"

\\

, NRC FORM 366 U.1. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT

~ '

CONTROL BLOCK: l l

l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

loTTl l Ml Nl Ml Nl Pl 1l@l 0 l 0 l -l 0l 0l 0l 0] 0l -l 0 l 0 l@[4 l 1 l 1l 1l 1l@l 'l lh 7

8 9 LICENSEE CODE 14 tg LaCENSE NUMUEH 26 26 LICENSE TYPE JO b7 LAIb8 CON'T IOlil a",0 l h l@l o ! 5 l o f o f 012161 3l@l 01612101811'l@l 0171210 l 81 1l@

S 7

8 6u 61 DOCKETNOVSER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQJENCES h I O I 2 I I Durine nonnal nower oneration. the RNGT system was returned to service followine l

I O 131 I maintenance with the RKOI di-charce isolation valve (Mn23991 open and inon rable. I 10111 l At lenst one en1ro in the return line uns not clnsod. ns vnnnired hv Tech.S ac.

1 i

iOIsiI 3.7.D.2. (The RKOI discharecs to the feedwater line which has two check valves in I FO M ! I serios tn nrovian isnintinna m line isnintion chock valves fully onerable.

I I O I 7 I I No effect on health or safety.

No previous events.

[

10181[

l

• $DE C0OE SusCODE COVPONENT CODE SUSC dE S

E 10191 i s I D I@ La.J@ LAJ@ I vl Al ti vi of Pl@ LAJ@ LZJ @

7 8

9 to il 12 13 18 19 20 S E QUE N TI AL OCCURRENCE REPORT REVISION LER RO EVENT YE AR REPORT NO.

CODE TVPE N C.

@,ag l218! 11. L_.;

10111 81 1-1 I ois l I tl 1-l 10 1 22 23 24 26 27 28 23 30 31 32 T KE ACT ON O PL NT METH HOURS S8 sf FOR bu8.

SUPPL E MA LFACTLRER LxJ@Lx]@

ll._J@

L2 J@

l of of ol of W@

W@

IA l@

lRl3l7l$@

33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l~TO l I Rwa! system niaced in service wit a isolation valve open and inoperable (due to I

! i l i I i toroue switch fa ilurel.

System operated 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 6 53 minutes when Tech.Snec.

I iii2II problem realized and system was isolated.

Motor and torque switch replaced and j

ii#3l l system returned to service.

Tech. Spec. chance under Consideration tO remove valvp ii14l 1 from list of isolation valves (already tw isolation valves downstream of this value).

7 8 9 80 ST US

% POWER OTHER S TA TUS DISCO RY DISCOVERY DESCRIPTION I i i s l l El@ l1 l 0 l 0 l@l NA l

l Al@l Operator observation

[

ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Ii Ie I Lll @ LLJ@l NA l

1 NA l

s a 9 to 11 44 45 80 PERSONNEL EXPOSunES NUY B E R TYPE DE SCRIPTION Ii Iil 1010 I o l@[z_J@l NA l

PE RSONNE L,,,;u'J,ES cESCniPnON@

NUvBER lo l o l o l@l NA l

i a 7

8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITV TYPE

DESCRIPTION

l i ! a l l Z I@l NA l

'o 8107280177 810720 so iSSu[o@ DESCRIPTION @

PDR ADOCK 05000263 NRC USE ONLY S

PDR [XJ l

NA g

llll[;;;;;;;l3 2 O 7

8 9 10 68 69 SO 1; NAME OF PREPARER U NNON PHONE-

--,n~r

--,r-m.-

-,n-,e,