05000336/LER-1978-014-03, /03L-0 on 780617:while Performing Monthly Control Element Assembly Surveillance Testing,Assembly 2 Dropped to Zero Steps from 178 Steps.No Component Failures Causing Control Element Assembly to Drop

/03L-0 on 780617:while Performing Monthly Control Element Assembly Surveillance Testing,Assembly 2 Dropped to Zero Steps from 178 Steps.No Component Failures Causing Control Element Assembly to Drop

ML19289F143
Person / Time
Site:	Millstone
Issue date:	07/14/1978
From:	Crockett J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289F141	List: 05000336/LER-1978-014, Forwards LER 78-014/03L-0 05000336/LER-1978-014-03, /03L-0 on 780617:while Performing Monthly Control Element Assembly Surveillance Testing,Assembly 2 Dropped to Zero Steps from 178 Steps.No Component Failures Causing Control Element Assembly to Drop
References
LER-78-014-03L, LER-78-14-3L, NUDOCS 7906040323
Download: ML19289F143 (1)

LER-1978-014, /03L-0 on 780617:while Performing Monthly Control Element Assembly Surveillance Testing,Assembly 2 Dropped to Zero Steps from 178 Steps.No Component Failures Causing Control Element Assembly to Drop

Event date:
Report date:
3361978014R03 - NRC Website

text

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LICENSEE EVENT REPORT 1

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60 61 DOCKET NUMBER 6a 69 EV ENT OATE 74 75 REPORT C ATE 80 EVENT DESCRIPT1CN AND PROBABLE CCNSEQUENCES h o

2 i While performing monthly Control Element Assembly (CEA) surveillance testina per I

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i Technical Specification 4.1.3.1.2, CEA No. 2 dropped to zero steos from 178 steps.

I o, ; This resulted in operation in Action statements 3.1.3.1.e (CEA misalignment)

I 3.2.3 (Fr(T)-maximurt of 1.453) and 3.2.4 (Tilt-maximum of.033).

Power was l

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- l reduced and CEA No. 2 realigned to the remainder of Group 5 (Full out) within one og,

hour.

Fr(T) and Tilt were within specification within two hours of CEA

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realignment.

Similar Occurrences:

76-55/3L, 10/22/76 & 73-10/3L, 6/12/78.

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