ML19332B379

LER 80-027/03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable

ML19332B379
Person / Time
Site:	Monticello
Issue date:	09/22/1980
From:	Nierode C NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19332B369	List: ML19332B368 ML19332B379
References
LER-80-027-03L, NUDOCS 8009260640
Download: ML19332B379 (1)

Text

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NRC FORM 366 U.S. NUCLEAR RnGULATORY COMMISSION l

(7 77)

LICENSEE EVENT REPORT l CONTROL BLOCK: l 1

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) f0Til l M i N l M l N l Pl 1l@l 0l 0lLICENSE 14

-l 0lNuusER 0l q q q-l0l0l@l4l L61lCENSE 26 26 1l TYPE1l 1l@l JO

'l lg b7 C AT b8 7 8 9 LICENSEE CODE lb CON'T

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,"c, IOIiI 7 8 lLl@l01510101012l 60 61 DOCKET NUMBER 61 3l@69l 68 0EVENT l 8DATEl 2 l 31 81 til@l 74 75 0 DATE REPORT l 9 l 260l 2 l 8 l 0 l@

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h FOT21 l During a monthly surveillance test control rod 42-11 was unable to be withdrawn I

iO i3i I after partially inserting it. The corresnanding Hydraulic Control Unit was checkedi I o l41 l and tne Drive Withdraw Riser Isolation Valve. CRD-102. was found closed. With l I

Ioisl I this valve closed control rod would not scram properiv. All other control rods 1 10 is I l onerational . Event renneted ner T A 6. 7. R 9. r- Frent hnd no effect on nublic l  !

l 0 l 7 l 1 health and safety. No pTevious similar occurrences. I 101811 I CODE CODE SUSCODE COMPONENT CODE SUB ODE SU E lO191 lR lB l@ [A_j@ lB l@ lV l A l L lV l E l Xl@ gg lD l @ 20 7 8 9 to 11 12 13 18 19

_ SEOUENTIAL OCCURRENCE REPORT REVISION ggp EVENTYEAR R EPORT NO. CODE TYPE N O.

@ ,arg,RO 1810 l 22

. l-l 23 l 012l71 24 26 l/l 27 l0131 28 M lLI 30 l_]

31 l0l 32

_ 21 TAK N A ON ON PL ANT MET D HOURS IT D FOR B. $UPPL MAN FACTURER IX 33 Igl34Gl@ l a@

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36 l0l0l0 hlSBl Nl@ l Nlg l Nl@ lGl0]8l0lg 31 40 43 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g l Operator left CRD-102 closed when HCU 42-11 was isolated for recharcine the Scram l m i Accumulator with Nitrocen Aucust 9, 1980. Valve was opened and rod denonstrated I i 2 I operable. Procedure will be revised to provide additional assurance of nrener i Li_LU l valve nositionine. I mI  !

STA $  % POWER OTHER STATUS Dis O R COVERY DJSCRIPTION Ii is I [Ejg l0 l 7 l Oj@l NA l lB[gl Operator 0$servation j  !

80 ACTivtTY CO TENT RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Li1LI 7 8 9 W @D OF RELEASElZJ@l_. NA 10 11 44 l l 45 NA Jgo PERSONNEL EXPOSURES NUYBE R TYPE DESCRIPTION -

I t 171 l 0 l O ! 0l@l Zl@l NA l PERsONNE L iNeuWits 7.uvaER OEsCRiPnON@ <

li t a8l 9l 0 ! O l 01@l12 NA l )

l F 11 60 Loss OF OR DAMAGE TO FACILITY R [Z_j @ l go l

7 8 9 10 NRC USE oNLY ,

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[TTTI ITE@lDESCR'PTION NA l l;;;;;i;;;;;l3 F S 9 10 68 69 80 E

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NAME OF PREPARER PHONE:

8000260640 __