05000336/LER-1980-040-03, /03L-0:on 801206,control Element Assembly 31 Dropped to Zero Steps from 180 Steps.Cause Not Stated.Power Reduced & CEA Realigned

/03L-0:on 801206,control Element Assembly 31 Dropped to Zero Steps from 180 Steps.Cause Not Stated.Power Reduced & CEA Realigned

ML19351F388
Person / Time
Site:	Millstone
Issue date:	12/31/1980
From:	Resetar J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351F386	List: 05000336/LER-1980-040, Forwards LER 80-040/03L-0 05000336/LER-1980-040-03, /03L-0:on 801206,control Element Assembly 31 Dropped to Zero Steps from 180 Steps.Cause Not Stated.Power Reduced & CEA Realigned
References
LER-80-040-03L, LER-80-40-3L, NUDOCS 8101120355
Download: ML19351F388 (1)

LER-1980-040, /03L-0:on 801206,control Element Assembly 31 Dropped to Zero Steps from 180 Steps.Cause Not Stated.Power Reduced & CEA Realigned

Event date:
Report date:
3361980040R03 - NRC Website

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60 61 ooCK ET NUug g R 68 69 (VENT oaf g 74 il REPoRroATE 80 EVENT DESCRIPTION AND PROS A8LE CONSECUENCES h a 2 puring steady-state 100% power operation. CEA No. 31 droceed to zero steos frem 180 m l steps. This resulted in operation in Action Statements 3.1.3.1.e (CEA misalignment).

I I o j. j p.2.2.a (Fxy(T)-maximum of 1.615) and 3.2.4.a (Tilt-greater than.02).

Power was I

gotsi ireduced and CEA No. 31 realigned with Group 1 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

Fxy(T) and tilt were I

pithin specification within 4.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of CEA realignment.

Similar Occurrences:

1-a s l o j i j [78-14 and 79-03.

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g IThere were no component failures causino the CEA to droo.

No carts were reolaced I

l3 li; pnd the CEA was recovered.

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