05000318/LER-1980-056-03, /03L-0:on 801116,control Element Assembly 1 Dropped Into Core.Cause Undetermined.Power Reduced to Less than 70% & Control Element Assembly Returned to Group Height

/03L-0:on 801116,control Element Assembly 1 Dropped Into Core.Cause Undetermined.Power Reduced to Less than 70% & Control Element Assembly Returned to Group Height

ML19345E010
Person / Time
Site:	Calvert Cliffs
Issue date:	12/16/1980
From:	Lagiewski J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345E006	List: 05000318/LER-1980-056, Forwards LER 80-056/03L-0 05000318/LER-1980-056-03, /03L-0:on 801116,control Element Assembly 1 Dropped Into Core.Cause Undetermined.Power Reduced to Less than 70% & Control Element Assembly Returned to Group Height
References
LER-80-056-03L-01, LER-80-56-3L-1, NUDOCS 8012220414
Download: ML19345E010 (1)

LER-1980-056, /03L-0:on 801116,control Element Assembly 1 Dropped Into Core.Cause Undetermined.Power Reduced to Less than 70% & Control Element Assembly Returned to Group Height

Event date:
Report date:
3181980056R03 - NRC Website

text

N9C FORM 366 U. S. NUCLEAR REGULATORY COMMISSION P 77)

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7 60 61 COCKET NUMBER 68 69 EVENT DATE 74 76 REPORT DATE do EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Io l2l l At 0300, during the perfonnance of surveillance testing, Control Element I

i o 13 i i Assembly (CEA) 1 drooped into the core. Reactor oower was immediately l

3 p.i t I reduced to 670". cer T.S. 3.1.3.1.f.

CEA 1 was restored to its grouo I

io is j l heicht at 0406. All other control element assemblies remained operable l

lo is i i throughout this event. LER's 80-12 (U-1) and 80-48 (U-2) describe l

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similar events

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33 04 36 37 40 41 42 43 44 47 CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h 1i io i l An electrical test of the CEA during its operation disclosed no cause for i

mI the event. A review of CEA droo occurrences is being conducted by olant i

i,,,,i personnel. The goal of this review is to detect similarities among such i

i, i3i l occurrences which will aid in troubleshooting efforts.

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. LaGiewski PHONE:(301) 269 4747 2,

NA?.tE OF PREPARER