05000336/LER-1979-003-03, /03L-0 on 790216:control Element Assembly 68 Dropped to Zero Steps,Resulting in Control Element Assembly Misalignment & Tilt to Max .029.No Component Failures. Control Element Assembly Recovered

/03L-0 on 790216:control Element Assembly 68 Dropped to Zero Steps,Resulting in Control Element Assembly Misalignment & Tilt to Max .029.No Component Failures. Control Element Assembly Recovered

ML19263C998
Person / Time
Site:	Millstone
Issue date:	03/16/1979
From:	Bates R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263C995	List: 05000336/LER-1979-003, Forwards LER 79-003/03L-0 05000336/LER-1979-003-03, /03L-0 on 790216:control Element Assembly 68 Dropped to Zero Steps,Resulting in Control Element Assembly Misalignment & Tilt to Max .029.No Component Failures. Control Element Assembly Recovered
References
LER-79-003-03L-01, LER-79-3-3L-1, NUDOCS 7903200414
Download: ML19263C998 (1)

LER-1979-003, /03L-0 on 790216:control Element Assembly 68 Dropped to Zero Steps,Resulting in Control Element Assembly Misalignment & Tilt to Max .029.No Component Failures. Control Element Assembly Recovered

Event date:
Report date:
3361979003R03 - NRC Website

text

{{#Wiki_filter:... LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 lo lil l Cl Tl til N I S l 21@l 010 l-l01010 l0 l 0l -l 01 Ol@l 411 l 1 l111 l@l i l@ i 8 9 LICENSEE CODE 14

S LCEP.SE NUV8ER 2S 26 LickNSE TYPE JJ Si CAT 58 CON'T lolil 3[,M l L l@l 0 l 51010 l 0 l 3 l 3 16 l@l 01 2l 1 l 6l 7 l 9 )@l 0 3 l116 l 7 l9 l@

i 8 60 61 COCKE T NUVBER 63 63 EVENT D ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 's for Axial Shape Index ( ASI) control, During riode 1 operation, while noving CEA g Io l2l 10131 l CEA tio. 68 dropped to zero steps. This resulted in operation in Action Statenents i g l 3.1.3.1.e (CEA misalignment), and 3.2.4 (Tilt - naxinun of.029). Power was i Tilt was within g g l reduced and CEA 68 realigned to group 7 within one hour. Similar occurrence 76-55/3L, J g I specification within one half hour of CEA realignnent. l 10/22/76; LER 78-10/3L, 6/12/78; LER 78-14/3L, 7/14/78. ja 7 I O s i 7 8 9 C OE CODE SUSC E COMPONENT COOf SUB dE S 5 l Rl Bl@ [Ej@ l A l@ l Cl Rl Di R I V l E l@ lZ @ y@ o 9 7 8 9 10 11 12 13 18 19 20 SECUENTI AL OCCURRENCC REPORT REVISION LE R 'RO EVENTYEAR REPORT NO. COCE TYPE N O. @y&%ar 1719I l-l 10 10 13 l M 10l3l lL l b [0j a 21 22 23 24 26 27 28 29 30 31 32 T KEr A T ON O PL T ET HOURS 22 SB IT FOR.\\15 S. SUPPL 1 ~ MAN FACT RER U@W@ W@ [zj@ 0 10 l 0 12 l lN l@ [D@ lNl@ l C l 419 l01{ e 34 35 26 37 43 41 42 43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h [i[oll There were no component failures causing the CEA to drop. No parts were i I . [i li j 1 replaced and the CEA was recovered. l 1 7 ( I _ l i 131 l I l i 14 i I 7 8 9 ST S % POWER OTHER $TATUS IS RY DISCOVERY DESCRWTION lil5l W @ l1l0l0l@l tlA l l A l@l Operator observation [ '8 A!TiviTv CO0 TENT AVOUNT OF ACTivirY @ l LOCATION OF RELEASE @ aELEASED OFRELEESE NA l NA l li 16 l l z l @ L_z_J@l 80 7 8 9 to i; 44 45 PERSONNEL _EXPOSUAES I i l 7 l l 0 l b l 0 l@ @) "'"" 't 1 '3 pen SONNE t,mUR',ES I _ l'ITl l 0 l 0 l 0 l@l NA 83 7 8 9 18 12 W,5 SC%,cfJN I E r _liIoItz_]@l flA isSUEn@lOtScamTiON O %QhQ fL NRC USE ONLY Pueti tv W NA 1 l l l l l l l l l 1 I l l -{ 4 2 o 68 62 33 *

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