ML19208A802

LER 79-028/03L-0:on 790902,during Surveillance Test,Control Element Assembly 43 Slipped to 100 Inches.Caused by Voltage Fluctuation in 15-volt Power Supply.Design Mod Initiated to Install Dual Power Supplies

ML19208A802
Person / Time
Site:	Calvert Cliffs
Issue date:	09/13/1979
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208A799	List: ML19208A798 ML19208A802
References
LER-79-028-03L-01, LER-79-28-3L-1, NUDOCS 7909170504
Download: ML19208A802 (1)

Text

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LICENSEE EVENT REPORT CcNTsOL stOC,e l l l l l l ]@ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 9 Ml0 l C l C l N l 142 l@l L6CENSEE CODE 15 0l 0 -l 0lLICENSE 0l 0NLVuER 0l 0l -l 0l 0l@l4 1L;CiNSE.a 26 l1 l1T*PE 1Jol@l l lg 57 CAT de CON T l l !@610 l 5 l0 0l0l3l1 8 j@l0 9 l0 l2 l7 l9 l@[0 l9 l1 l3 l719 j@

0 1 7 6 5c$$*CE 60 68 69 74 75 AEPORT C ATE 30 DOCKET NLY8ER EVENT DATE EVENT CEOCA6PTION AND PPOB ABLE CONSECUENCES h o 2 l At r043 while perfaming a surveillance test, control eierent assembly (CEA) I o 3 43 slipped to 100 inches. Reactor power was reduced to less than 70 percent l 0 , l at 0140 in accordance with T.S. 3.1.3.1. CEA 43 was withdrawn and leveled l I

o ., lwith its group at 0143. LER's 78-48 (U-1) and 79-24 (U-2) describe similar events. l.

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33 40 41 42 43 44 47 CAUSE CESCRIPTION AND CC ARECTIVE ACTICNS h li o ITha sliored CEA is assc-ed to be the rasult of a voltace fluctuation in the 15 I i i I volt oewer surelv. A desicn codification to innrove the raliability of 'ha I i  : Isvstem bv installino dual nouer sucolies (FCR 7E-72) is to be installed durino I i 2 i the next refueline nutace. l l{ .1 l 7 8 9 80 STA N PO'.". E R OTHEM STATUS OS O AY CISCCV ERY OESCA.FTiCN ri TTI Lt_J@ l 1101 Ol@l NA I Isl@l surveillance Test i A CTi o Tv CONTENT PFLEASEO OF EELE ASE AYOUNT OF ACTIVITY LOCATaCN OF PELE ASE i e LLj @ LZJ@ NA I NA I 7 a 9 to 11 44 45 30 PE os;'.N E . E A POSLa ES

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