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 U.S. NUCLEAR REGULATORY COI MISSION DOCKET NUMBER I2-76)

L FILE NUMBER NRC DISTRIBUTION FDR PART 50 DOCKET MATERIAL INCIDENT REPORT

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FLORIDA POWER & LIGHT CP DATE OF DOCUMENT HIAHI,, FLA.... 3,-19-"t t MR N C MOSELEY DATE RECEIVED A D SCHMIDT 3-Q4 -7

/LETTER 0 NOTOR IZED PROP INPUT FORM OF COPIES RECEIVED t'UMBER

+ORIGINAL ~NC LASS IF I ED CI COP Y Signs DESCRIPTION ENCLOSURE

/

LTR TRANS THE FOLLOWING... 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

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ACRS SAFETY BRANCH CHIEF:

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HOLDING/ ENT TO LA i',o 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 EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR TIC NSIC NRC FORM 195 I2.76)

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P.O. BOX 013100 MIAMI,FLA. 33101 keZIilatop g os(et p]1 FLORIDA POWER 5 LIGHT COMPANY

,<<>> 'IS~ March 18, 1976

~V 4 /Ill PRN-LI-7 -54 ~

M~RP 6 l9 4.S. llllaSm SSGu4ggJQI CONNISSIOQ

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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

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

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,r LICENSEE EVENT REPORT CONTROL BLOCK: (P E PAINT ALL REQUIRED INFOAMATION3 6

UCENSEE UCENSE EVENT NAME UCENSE NUMBER TYPE TYPE F L S I S 1 0 0 0 0 0 0 0 0 4 1 1 1 1 ~0011

,7 89

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14 15 25 26 30 31 32 REPORT. REPORT

. CATEGORY OOCKET NUMBER ~ EVENT OATE REPORT OATE

[001]coNT 0 5 0 0 3 5 0 3 0 8 7 6 0. 3 1 8 7 6 7 8 57 58 59 60 61 68 69 74 " 75 80 EVENT DESCRIPTION Durin oreogerational core loadi an e ineering review by the FPL General Office 7 8 9 80

[00~] E ineeri 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 80

[oat) This is the first occurrence of this type. (335-76-3)..

7 8 9 '

pr'RME

~ 80 SYSTEM . CAUSE COMPONENT COMPONENT COOE COOE COMPONENT COOE SUPPUER MANUFACTURER VXKATKIN

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7

~IB 8 9 10

~B 11 12 I N S T R U 17 A

43 '4 C 5 6 0 47 N

48 CAUSE DESCRIPTION tOOI This occurrence vras caused b an ESFAS circuitr desi error. All ESFAS si als were 7 8 9 80 tODS]

7 8 9 f ovrer Circuit modifications are bei 80 made .to compel vrith FSAR Section 7.3.1.4 and vrill be completed before entering 7 89 FACIUTY METHOO OF 80 STATUS  % POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION Q~g 8 9

~B ~oo o NA c 'ngineering revievr of ESF circuitry 80.

7 10 12 13 44 45 46 FORM OF ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q>g z ~z NA NA 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~~~ ~oo o z NA 7 89 11 12 13 60 PERS'ONNEL INJURIES OESCRIPTION Q4] 0 0 0 NA 7 8 9 11 12 80 PROBABLE CONSEQUENCES Q~g NA

.7 89 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION z NA 7 89 10 80 PUBLICITY NA 7 89 ~ 80 ADDITIONAL FACTORS'~

g Cause Descrintion Cont.  : Technical S ecification mode 4.

7 89 80 7 89 80 M. A. S ChO man PHONE:

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