ML18110A661

LER 1976-002-00 for St. Lucie Unit 1, Spent Fuel Crane Overload Interlock-Setpoint Drift

ML18110A661
Person / Time
Site:	Saint Lucie
Issue date:	04/05/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-76-69 LER 1976-002-00
Download: ML18110A661 (7)

Text

NRC FORM 195 I2 75I I U.S.NUCLEAR REGULATORY COMMISSION TO: N.C.Moseley FRDM: Flordia Power 8 Light Co.Miami, Flordia A.D., Schmidt NRC DISTRIBUTION~DR P T 50 DOCKET MATERIAL DOCKET NUMBER 50-335 F II.E NUM GE R INCIDENT REPORT DATE OF DOCUMENT 4-5-76 DATE RECEIVED 4-15-76 OLETTER D ORIGINAL SCOPY 0 NOTOR IZ E D t5UNC LASS IF I E 0 PROP INPUT FORM NUMBER OF COPIES RECEIVED'30 DES C RIP T ION Ltr.trans the followiIIIg.......

PLANT NAm: St.Luc1e<'NCLOSURE Reportable OccIJrreoee 8 76-2 Licensed Event Report on'-5-~7 Concerning the Spent Fuel Crane interlock setpoint drifting...,...

(30 Cys.Received-No Original)ACKNOWLZDGmD DO NOT REMOVE NOT/: IF.PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J.COLLINS SAFETY BRANCH CHIEF.: W 3 CYS FOR ACTION LIC~ASST: W/CYS ACRS CYS ENT TO LA FOR ACTION/INFORMATION ENVIRO SAB 4-19-76 INTERNAL D I ST R I BUT l OiV NRC PDR&E 2 SCHROEDER/IPPOLITO NOVAK CHECK IIES IWEN E TEDE CO HACCA BAE SHAO OLLMER BUN H KRE E OL N TIC NSIC Ft Pi rce F EXTERNAL DISTRIBUTION CONTROL NUMBER 3822 NRC FORM I05 I2.75I

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~"),~)Vii".k-)."'q V v-Q IJ$', ll N~5[3p V/[(~%'f>'>$~f PL I%P~>L..li'f f,'".)"f)I'i P.O.SOX 1100 PhfAMI, FLORIOA QQI01~.r fLORIDA POWER R LIGHT GOIIPAHY)OPVfaaOry April 5, 1976 PRN-LI-76-69 Mr.Norman C.Moseley, Director, Office of Inspection and Enfor U.S.Nuclear Regulatory Comm 230 Peachtree Street, N.W., S Atlanta, Georgia 30303

Dear Mr.Moseley:

Oy o~cxo~e 8 gg)87.6>REPORTABLE OCCURR 35-7 ST.LUCIE UN DATE OF OCCURRENCE:

tlARC , 1976 SPENT FUEL CRANE OVERLOAD INTERLOCK-SETPOINT DRIFT The attached Licensee Event Report is being submitted in accordance with Technical'pecification 6.9 to provide 30-day notification of the subject'occurrence.

~Very truly yours, D.chmxdt Vice President Power Resources MAS/ms Attachment CC Jack R.Newman, Esquire Director, Office of Inspection and Enforcement (30)Director, Office of Management Information and Program Control (3)HELPING BUILD FLQRIDA p>.'.Is 1 e l I h , 1f I'k 0" gN"~"*<<)Ci z~P'"~>3s" W CONTROL BLOCK: 1-IJCENSEE NAME fODg F L S L S 1 0 0 7 89 14 15 REPORT REPORT CATEGORY TYPE SOURCE I001Icomv~~L~L 0 5 7 8 57 58 59 60 61 EVENT DESCRIPTION Qp 2 During initial core loading, fP SE PRINT ALL REaUIREO INFORMATION3 6 UCKNSE EVENT LCENSE NUMSER TYPE TYPE 0 0 0 0'-0 0 4-1 I 1 1~0 3 25 ZB 30 31 32 DOCKET NUMBER~EVENT DATE REPORT DAT\0-0 3 3 5 0 3 0 5 7 6 0 4 0 5 7 6 68 69 74 75 BO the spent fuel crane overload interlock setpoint was 7 8 9 I'ound to have drif ted above 2000 pounds.This is contrary to the surveil lance re-7 89 60[gg~]quirements of Technical Specification 4.9.7.The immediate corrective action was to 7 8 9~0 5 sto core loadin.This was the first occurrence of this t De.(335-76-2).

7 8 9 Jog MANUFACTURER D l 7 0 47 7 8.9 PRME SYSTEM CAUSE COMPONENT CODE CODE COMPONENT CODE VXXATCN ICOPI~FD~B I N s T R 0~N N 7 8 9 10 11 12 17 43 44 48 CAUSE OESCRIPTION gg The cause of the occurrence was malfunction of the crane interlock.

80 The interlock was 7 8 9 60 ICOSI malfunctioning such that it would oca csioanllypr v,ee t na fuel assembly from being 7 8 9[110]lifted.Conversely, when (continued on Page 2).60 e OTHER STATUS NA 7 8 9 LOSS OR OAMAGE TO FACILITY TYPE OESCRlPTION

~z 7 89 10 PUBLICITY 7 89 7 89 FACfLflY STATUS%POWER gg~B~00 o 7 8 9 10 12 13 FORM OF ACTlVITY COATKNT RELEASEO OF RELEASE AMOUNT OF ACTlvlTY s a~z~z NA 7 8 9 10 PERSONNEL EXPOSURES NUMBER TYPE OESCRVSTlON

~s~oo o z 7 89 11 12 13 PERSONNEL IN JURIES NUMSER DESCRIPTION Q~4j~00 o 7 89 11 12 PRQQ$$3LE CONSEQUENCES

~~15 METHOD OF OlSCOVERY 44 45 46 44 45 LOCATION OF RELEASE NA NA NA NA NA NA OSSCOVERY DESCRIPTION Routine Tech.Spec.surveillance 80 80 80 60 AOOmONAL FACTORS~ca See Page Two for continuation of Cause Description.

7 89 80 7 89 M.A.Schoppman s 305/552-3779 Cl'0 III~4~T

~'REPORTABLE OCCURRENCE 33 6-2 LICENSEE EVENT REPOM PAGE TWO Cause'escri tion continued) tested, the interlock would occasionally permit loads in excess of 2000 pounds to be lifted.This indicated an intermittent condition.

The im-mediate action was to propose that the requirement for the interlock be temporarily suspended to allow fuel loading to continue.The proposal included administratively limiting the permissible crane load to 2000 pounds by limiting the objects which could be lifted to a fuel element assembly or a control element assembly, neither of which weighs in ex-cess of 2000 pounds.The temporary suspension, effective until midnight, March 19, was granted on March 5, 1976 by letter from the.NRC Division of Project Management..

Followup action will be to evaluate the adequacy of the design of the current interlock.

If replacement of the interlock is necessary, it will be done before the first scheduled refueling outage.