05000263/LER-1980-027-03, /03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable

/03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable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: 05000263/LER-1980-027, Forwards LER 80-027/03L-0 05000263/LER-1980-027-03, /03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable ML19332B379
References
LER-80-027-03L, NUDOCS 8009260640
Download: ML19332B379 (1)

LER-1980-027, /03L-0:on 80823,during Monthly surveillance,42-11 Test Control Rod Could Not Be Withdrawn After Partial Insertion.Caused by Closed Drive Withdraw Riser Isolation Valve CRD-102.Valve Opened & Rod Was Operable

Event date:
Report date:
2631980027R03 - NRC Website

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NRC FORM 366 U.S. NUCLEAR RnGULATORY COMMISSION l

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCKET NUMBER 68 EVENT DATE 74 75 REPORT DATE 60 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DESCRIPTION AND PROBABLE CONSEQUENCES h FOT21 l During a monthly surveillance test control rod 42-11 was unable to be withdrawn I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.

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lGl0]8l0lg 33 34 3b 36 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

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