ML18110A679

LER 1976-003-00 for St. Lucie Unit 1, a Design Error in Engineered Safety Features Actuation System

ML18110A679
Person / Time
Site:	Saint Lucie
Issue date:	03/18/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/RGN-II
References
PRN-LI-76-54 LER 1976-003-00
Download: ML18110A679 (6)

Text

NRC FORM 195 I2-76)L U.S.NUCLEAR REGULATORY COI MISSION DOCKET NUMBER;ro: MR N C MOSELEY FLORIDA POWER&LIGHT CP HIAHI,, FLA....A D SCHMIDT/LETTER+ORIGINAL CI COP Y 0 NOTOR IZED~NC LASS IF I ED PROP INPUT FORM NRC DISTRIBUTION FDR PART 50 DOCKET MATERIAL FILE NUMBER INCIDENT REPORT DATE OF DOCUMENT 3,-19-"t t DATE RECEIVED 3-Q4-7 t'UMBER OF COPIES RECEIVED Signs DESCRIPTION LTR TRANS THE FOLLOWING...

ENCLOSURE/LICENSEE EVENT REPORT 50-335/76-3 ON 3-8-76 RE ESFAS'IRCUITRY DESIGN ERROR THAT CAUSED LOSS OF POWER CAUSING SIGNALS TO GO TO THE BYPASS MODE....PLANT NAME: NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS SAFETY BRANCH CHIEF:~*LIC.ASST:~W/CYS ACRS CYS HOLDING/i',o ENT TO LA FOR ACTION/INFORMATION ENVIRO INTERNAL D IST RI BUTION NRC PDR 6 E 2 SCHROEDER/IPPOLITO NOVAK CHECK MES S lF E TEDE CO MACCA BAER SHAD VOLLMER BUNG KRE ER J OL NS LPDR TIC NSIC EXTERNAL DISTRIBUTION CONTROL NUMBER NRC FORM 195 I2.76) t l~q~x(P/g P.O.BOX 013100 MIAMI, FLA.33101 keZIilatop g os(et p]1 ,<<>>'IS~~V 4/Ill M~RP 6 l9 4.S.llllaSm SSGu4ggJQI

~/CONNISSIOQ Mell Seel leSS Mr.Norman C;.os~/+rector, Region II Office of Inspec~hid

~~and Enforcement U.S.Nuclear FRegulatory Commission 230 Peachtree Street, N.W., Suite 818 Atlanta, Georgia 30303 FLORIDA POWER 5 LIGHT COMPANY March 18, 1976 PRN-LI-7-54~

Dear Mr.Moseley:

REPORTABLE OCCURRENCE 335-76-3 ST.LUCIE UNIT 1 DATE OF OCCURRENCE:

MARCH 8, 1976 DESIGN ERROR IN ENGINEERED SAFETY FEATURES ACTUATION SYSTEM The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.6.l.a to provide prompt notification of the subject occurrence.

Very truly yours, A.D.Schmidt.Vice President Power Resources'AS/cpc Attachment u'I cc: Jack R.Newman, Esquire Director, Office of Inspection and Enforcement (40)Director, Office of Management Information and ,Program Control (3')HELPING BUILD FLORIDA p O.

UCENSEE NAME F L S I ,7 89.CATEGORY[001]coNT~7 8 57 58 S 1 0 14 15 REPORT.REPORT 59 60 ,r CONTROL BLOCK: LICENSEE EVENT REPORT t (P E PAINT ALL REQUIRED INFOAMATION3 6 UCENSE EVENT UCENSE NUMBER TYPE TYPE 0-0 0 0 0-0 0 4 1 1 1 1~0011 25 26 30 31 32 OOCKET NUMBER~EVENT OATE REPORT OATE 0 5 0-0 3 5 0 3 0 8 7 6 0.3 1 8 7 6 61 68 69 74" 75 80 EVENT DESCRIPTION Durin oreogerational core loadi an e ineering review by the FPL General Office 7 8 9[00~]E ineeri 80 Staff indicated that upon loss of TIovrer all ESFAS signals would go to the 7 8 9 80 toD4]b ass mode vrhereas onl the CSAS and RAS signals should do so.FSAR Section 7.3.1.4 7 8 9 80[OD~]re uires that si als other than CSAS and RAS go to the trip mode upon loss of povrer.7 8 9[oat)This is the first occurrence of this type.(335-76-3)..

80 7 8 9 SYSTEM.CAUSE COOE COOE COMPONENT COOE[QD>]~IB~B I N S T R 7 8 9 10 11 12 CAUSE DESCRIPTION tOOI This occurrence vras caused b 7 8 9 tODS]pr'RME~'80 COMPONENT COMPONENT SUPPUER MANUFACTURER VXKATKIN U A C 5 6 0 N 17 43'4 47 48 an ESFAS circuitr desi error.All ESFAS si als were 80 f ovrer Circuit modifications are bei 7 8 9 made.to compel vrith FSAR Section 7.3.1.4 and vrill be completed before entering 80 OTHER STATUS NA NA NA 7 89 FACIUTY STATUS%POWER Q~g~B~oo o 7 8 9 10 12 13 FORM OF ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY Q>g z~z NA 7 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~~~~oo o z 7 89 11 12 13 PERS'ONNEL INJURIES OESCRIPTION Q4]0 0 0 7 8 9 11 12 PROBABLE CONSEQUENCES Q~g NA 44 45 80 60 80 METHOO OF 80 OISCOVERY OISCOVERY OESCRIPTION c'ngineering revievr of ESF circuitry 44 45 46 80.LOCATION OF RELEASE NA.7 89 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION z 7 89 10 PUBLICITY 7 89 NA NA 80 80~80 ADDITIONAL FACTORS'~g Cause Descrintion Cont.: Technical S ecification mode 4.7 89 80 7 89 M.A.S ChO man 80 PHONE: CFO 4~)~SOT f%Ql J'gg