ML19343A223

LER 80-028/03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned

ML19343A223
Person / Time
Site:	Millstone
Issue date:	09/08/1980
From:	Harris J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19343A219	List: ML19343A218 ML19343A223 ML19343A224 ML19343A226
References
LER-80-028-03L, LER-80-28-3L, NUDOCS 8009160461
Download: ML19343A223 (1)

Text

, _ -_. _ -.__

NM4 Purim JePJ q.m . -- LICENSE 5 EVENT REPORT CONT 3ol stock: 1 1-I l l l l lh 6

(PLEASE PRINT On TYPE ALL REQUIRED INFoRMATION) foTi'l8 l9 CITLICENSEE I M I CODE N I s i 2 l@l 01 01- 1 LICENSE 01010101 - l 0101025 l@l26 411 11 11 LICENSE TYPE11JQ l@l l

57 CAT 58 I@

7 le 15 NUMBER

. CON'T (10151 7 8 s$RC60 l L l@l 015101010131316 61 DOCKET NUMBER 68 69 l@l EVENT01811111810 0 ATE 74 75 l@l01910181810 REPORT OATE 80 i@

EVENT oESCRIPTioN AND PROB ABLE CONSEQUENCES h -

1o: 21 I During steady-state 100% power operation, CEA No. 41 dropped to zero steps from 180 l

[Trr1 l steps. This resulted in operation in Action ' Statements 3.1.3.1.e (CEA misalignment) I l o 141 13.2.4 (Tilt-greater than .02). Power was reduced and CEA No. ai realicned with Group 7 I t o lsl lwithin i hour. Following recovery of CEA No. 41 and with power at 70%, CEA No. 65 1

Tilt was within specification lo is 1 I dropped and was realigned with Group 7 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. f i

lo l7l l within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. _

__J

'I o la i I ..

80 E CC E sVSCO E COMPONENT CODE sVSCODE S I lo191 I R I B l@ [Ej@ l A l@ IC lR lD lR IV lE l@ [Z_J@ l 20Zi @ 18 19 7 8 9 10 11 12 13 CCCURRENCE REPCRT REVis3ON SEQUENTIAL TYPE N O.

gqfRo SVENT YEAR R EPORT NO. CODE O s(g; a 18101 l-l 1012181 1/l 10131 l L; l-1 10 1 02 22 23 24 26 27 28 3 30 31

_ 21 HOURS sS I PCR 8. s PPLIE VA bpACTLRER T N AC C C PLANT VE LI.J@lz 33 J4 J@ L3J@

35 llj@

36 l 010 I a 18 I 37 40 in.J@

41 lNl@

42 lNl@ l C l 41910 I@

43 44 47 CAUSE CEsCRIPTION AND CORRECTIVE ACTIONS h ,

li t o l l The accarent cause of the CEA's to droo was a faulty jumper cable from the refuel l iili; l disconnect panel to the reactor head. No parts were replaced. A new head cabling I i,12i i system and checkout of all reed switches is planned for the 1980 refuel outaCe. I l-liial I l

li i41 I C

'sTM's 'sPewER cTsER status @ Eis'Cov5fv' oiscovERv oEsCRiPTicN @

fiTil L gj@ li 10 -10 l@l NA I lAl@l "Ooerator observation l A!TiviTv Co'0 TENT AMOUNT OF ACTivtTV LOCATION CP RELEASE RELEASE Q l Z l @D OF RELEASE [Z_j@l NA l l NA [ ,

' ' ' ' ERseNNEL ExPesMEs NUveER TYPE OEsCRIPTICN Ii 171 l 0101 O l@[1.j@l' NA 'l

' PERSONNEL iNau7iEs P

NuveER- - cEsCRiPTiON@

l 17Ti'liOI010l@l-7 8 9 _11 NA 80

"'A'e'# '"" @

7 t 9 8 9

's'PE @ is'C l 10 . .

NA -

80 I

"* NRC USE ONLY

,ssvEl @c'ESCR,,T,oN _.n4 NA.@ 61 -

l 11llll?lllll[j-

. lJ.,,Lo.J. L L..,g 7

NJ o ouw ea .. .02 MW-W1 awymarerirryvm J.S. Harris pyoys _ _{