05000336/LER-1980-028-03, /03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned

/03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned

ML19343A223
Person / Time
Site:	Millstone
Issue date:	09/08/1980
From:	Harris J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19343A219	List: 05000336/LER-1980-028-03, /03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned 05000336/LER-1980-029-03, /03L-0:on 800812,during Surveillance Test on 12 U diesel,125 Vdc Ground Alarm Received.Caused by Frayed Insulation on Wire in Bendix Connector Allowing Contact Between Bare Wire & Connector Shell.Wire Recovered 05000336/LER-1980-030-03, /03L-0:on 800812,during Routine Operation, Containment Air Temp Exceeded 120 F.Caused by Svc Water Temp Control Valve to Reactor Bldg Closed Cooling Water Heat Exchangers Being Set Too High.Valve Readjusted ML19343A218
References
LER-80-028-03L, LER-80-28-3L, NUDOCS 8009160461
Download: ML19343A223 (1)

LER-1980-028, /03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned

Event date:
Report date:
3361980028R03 - NRC Website

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LICENSE 5 EVENT REPORT CONT 3ol stock: 1 I

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l l lh (PLEASE PRINT On TYPE ALL REQUIRED INFoRMATION) 1-6 foTi'l l CIT I M I N I s i 2 l@l 01 01-1 01010101 - l 01010 l@l 411 11 11 11 l@l l

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7 8 9 LICENSEE CODE le 15 LICENSE NUMBER 25 26 LICENSE TYPE JQ 57 CAT 58

. CON'T (10151 s$RC l L l@l 015101010131316 l@l 01811111810 l@l01910181810 i@

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60 61 DOCKET NUMBER 68 69 EVENT 0 ATE 74 75 REPORT OATE 80 EVENT oESCRIPTioN AND PROB ABLE CONSEQUENCES h 21 I During steady-state 100% power operation, CEA No. 41 dropped to zero steps from 180 l

1o:

This resulted in operation in Action ' Statements 3.1.3.1.e (CEA misalignment)

I [Trr1 l steps.

l o 141 13.2.4 (Tilt-greater than.02).

Power was reduced and CEA No. ai realicned with Group 7 I t o lsl lwithin i hour.

Following recovery of CEA No. 41 and with power at 70%, CEA No. 65 1

lo is 1 I dropped and was realigned with Group 7 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

Tilt was within specification f

lo l7l l within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

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CC E sVSCO E COMPONENT CODE sVSCODE S

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10 11 12 13 18 19 20 SEQUENTIAL CCCURRENCE REPCRT REVis3ON gqfRo SVENT YEAR R EPORT NO.

CODE TYPE N O.

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J4 35 36 37 40 41 42 43 44 47 33 CAUSE CEsCRIPTION AND CORRECTIVE ACTIONS h li t o l l The accarent cause of the CEA's to droo was a faulty jumper cable from the refuel l

iili; l disconnect panel to the reactor head.

No parts were replaced. A new head cabling I

i system and checkout of all reed switches is planned for the 1980 refuel outaCe.

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