ML18113A320

LER 1976-034-00 for St. Lucie Unit 1, in Order to Compensate for Errors Found in NSSS Vendor'S Strikin II Computer Code, Several Instrumentation and Control Setpoints Were Adjusted

ML18113A320
Person / Time
Site:	Saint Lucie
Issue date:	08/06/1976
From:	Schmidt A D Florida Power & Light Co
To:	Moseley N C NRC/IE, NRC/RGN-II
References
PRN-LI-76-199 LER 1976-034-00
Download: ML18113A320 (7)

Text

NRC Pv>1M 106 g.voI U.S.NUCLEAR REGULATORY C SION DOCKET NUMBER 50-335 NRC DISTRIBUTION FoR PART 60 DOCKET MATERIAL FILE NUMBER INCIDIWT RI"PORT TO: Mr.Norman C.Moseley FROM: Florida'Power

&Light Company Miami, Florida A.D S'chmidt DATE OF DOCUMENT 8/6/76 DATE RECEIVED 9/l/76 LFTTER jgoRIDINAL C3coPY DESCRIPTION QNOTORIZED g UN C LASS IF I E D PROP INPUT FORM~8~g~j~I ENCLOSURE NUMBER OF COPIES RECEIVED.One signed~I l~myv Ltr.trans the following:

PLANT mIE't.Lucie Nl (l-P)Licensee Event Report (RO 50-335-76-34) on 7/6/76 concerning corrective measures taken to compensate for errors found in the NSSS vendor's STRIKIN II computer code.ACKNOWLEDGED

('-').DONOV H,ZMOVZ NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J.COLLINS BRANCH CHIEF: W Cr8 1OR ACTION LIC..ASST.:

W CYS ACRS CYS HOLDING S Ziemann Di s TO LA FOR ACTION/INFORMATION 9 2 76 RJL INTERNAL D IST R I BUTION NRC PDR IREE 2 MIPC SCHROEDER IPPOLITO HOUSTON NOVAK CHECK GRIMES CASE~~TEDESCO MACCARY EISENHUT SHAO VOLIZER BUNCH GER J.COLLINS LPDR: Ft.Pierce Fla.TIC: EXTERNAL DISTRIBUTION CONTROL NUMBER~g pig%>11 Irrwa 0 I F~4 5 ffpJp li i)v g/(llig pl~E W1 cas P.O.SOX 0I3I00, MIAMI, FLORIDA 33IO'I~gagulaelIX@~'"'-~gilllg~=-"O'a FLORIDA POWER 5 LIGHT COMPANY August 6, 1976 PRN-LI-76-199 tt Mr.Norman C.Moseley, Director, Region XI Office of Inspection and Enforcement U.S.Nuclear Regulatory Commission 230 Peachtree Street, N.W., Suite 818 Atlanta, Georgia 30303

Dear Mr.Moseley:

~If,"P g,S,~+~~INI08 C~I~IIaII REPORTABLE OCCURRENCE 335-76-34 ST.LUCIE UNIT 1 DATE OF OCCURRENCE:

JULY 6, 1976 LOCAL POWER DENSITY ALARM SETPOINT The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30-day notification of the subject.occurrence.

Very truly yours, D.Schmidt Vice President Power Resources MAS/bfp Attachment cc: Jack R.Newman, Esquire Director, Office of Inspection and Enforcement (30)Director, Office of Management Information and Program Control (3)HELPING BUILD FLORIDA

CONTROL BLOCK: LICENSEE EVENT REPORT (PLEASE PRINT ALL RECIUIRED INFORMATION)

LK4ENSEE NAME[OD1]8 L S L S 1 0 7 89 14 15 LICENSE NUMBER 0-0 0 0 0 0-0 0 25 UCENSE TYPE EVENT TYPE 4 1 1 1 1~03 26 30 31 32 , CATEGORY TYPE SOURCE REPORT REPORT~DOCKET NUMBER EVENT OATE REPORT OATE QpgooN7~~L~L p 5 p p 3 3 5 0 7 0 6 7 6 0 8 0 6 7 6 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

[pp~]In order to compensate for errors found in the NSSS Vendor's STRIKIN II 7 8 9 80[QQ3]computer code (see LER 335-7 6-3 1), several instrumentation and control 7 8 9~80 top~]setpoints were adjusted.The adjustment factor for the core local 7 8 9 80[0D~]ower densit alarm was 1.24 however on Jul 6 a nonconservative 7 8 9 80 gg value of 1.1 was set into the instrumentation.

The error was found 80 7 8 9 PRME SYSTEM CAUSE COMPONENT COMPONENT COBE COBE COMPONENT COOE SUPPUER MANUFACTURER

~I~AANNUNCNF120 7 8 9 10 11 12 17" 43 44 47 CAUSE DESCRIPTION

~0 8 A nonconservative adjustment factor was set into N 48 the Incore Detector 80 A memorandum which lists the ro er 7 8 9[oO~]S stem because of ersonnel error.7 8 9 80 ,Q~O set oin a d r ss'm OTHER STATUS N/A AMOUNT OF ACTIVITY N/A PROBABLE CONSEQUENCES

[<is]7 8 9 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION HE LzJ 7 89 10 PUBLICITY 7 89 FACRJTY STATUS 5 POWER~B~08 0 7 8 9 10 12 13 FORM OF ACTIViTY COATENT RELEASEO OF RELEASE Q~g z z 7 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~z~00 8 7 8 9 11 12 13 PERSONNEL INJURIES EH.LoL~7 89 11 12 METHOO OF OISCOVERY C 44 45 46 44 45 N/A N A N/A DISCOVERY OESCRIPTION N/A LOCATION OF RELEASE N/A 80 80 80 80 80 80 80 7 89 ADDITIONAL FACTORS'ee a e two for continuation of Event Descri tion and Cause~80 7 8 9 Description.

~99 7 89 NAME: M.A.Schoppman 305/552-3779 PHONE'0 GPO Spl GOT REPORTABLE OCCURRENCE 335-76-34 LICENSEE EVENT REPORT Pa e Two Event Descri tion (Continued):

approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> later during a review of the setpoints, ,and the setpoint for the core local power density alarm was corrected.

Review of the Digital Data Processor printout for this 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period showed that there was no time during which operation was in noncompliance with the requirements of Technical Specification 3.2.1 for a revised linear heat rate limit of 12.7 kw/ft.This was the first occurrence of this type at St.Lucie Unit, l.(335-76-34)

Cause Description (Continued):

distributed for review by appropriate personnel.