ML18127A648

LER 1978-026-00 for St. Lucie Unit 1, on 07/30/78 Concerning During PWR Operation Digital Data Processing System Malfunctioned Resulting in Loss of CEA Backup Position Indication & Incore Flux Detector System Used to Monitor Flux D

ML18127A648
Person / Time
Site:	Saint Lucie
Issue date:	08/28/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/RGN-II, NRC/IE
References
PRN-LI-78-236 LER 1978-026-00
Download: ML18127A648 (5)

Text

REGULATORY INFORMATION DISTRIBUTION YSTEM < RIDS)

DISTRIBUTION FGR INCOMING MATERIAL 50-335 REC: QREILLY J P GRG: SCI.IMIDT A D DOCDATE: 08/28/78 NRC FL PWR 5 LIGHT DATE RCVD: 09/05/76 1

DGCTYr E: LETTER . 'NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR i ENCL i FORWARDING LICENSEE EVENT REPT <RO 50-335/78-026) QN 07/30/78 CONCERNING DURING PWR OPERATION THE DIGITAL DATA PROCESSING SYSTEM MANLFUNCTIONED RESULTING IN LOSS GF CEA BACKUP POSITION INDICATION AND Tl<E INCQRE FLUX QB~ SYSTEM V~ED TO MONITOR Fl UX D

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PLANT NAME: ST LUCIE Ni REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL:

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FOR ACTION: 4 BC<H>W/4 ENCL INTERNAL: REG NRC PDR>4W/ENCL E-3~~W/2 ENCL MIPC++W/3 ENCL C SYSTFMS BR4F+W/ENCL EMERGENCY PLAN BR<+lJ/ENCL NOVAK/CHECK~'tW/ENCL EEB!H!W/ENCL AD FOR ENG+~W/ENCL PLANT SYSTEMS BR+<W/ENCL HANAUER~~W/ENCL AD FOR PLANT SYSTEMS+wW/ENCL AD FGR SYS 5 PROJ4H~W/ENCL REACTOR SAFETY BR<<lJ/ENCL ENGINEERING BR4H, W/ENCL , VOLLMER/BUNCIH+4W/ENCL KREGER/ J. COLLI NS4~4 W/ENCL POWER SYS BR++W/ENCL K SEYFRIT/IE>+W/ENCL k EXTERNAL: LPDR'S FT PIERCE. FL~H~W/ENCL NS IC~H~W/ENCL ACRS CAT 84~4 W/16 ENCL DISTRIBUTION: LTR 44 ENCL 44 CONTROL NBR: 782480i-2  !

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FLORIDA POWER 5 UGHT COMPANY August 28, 1978 PRN-LI-78-236 Mr. James P. O'Reilly, Directory, Region

-Office of Inspection and Enforcement II U'.S. Nuclear Regulatory Commission 230 Peachtree Street, N.N., Suite 1217 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-26 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: JULY 30, 1978 TECHNICAL SPECIFICATION 3.1-3.3 DIGITAL DATA PROCESSING SYSTEM 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/sn Attachment cc: Harold F. Reis, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 78248013Z PEDI'LE .. SAVING PEOPLE

NRC PORIII 284 U.*NUCLcEAR RECULATOAY C~LI64ISSIQN LT TTI LICENSEE EVEIVT REPORT

'Q /PLEASE PRliiT CA YPc Al.'ECUfREO ItIFQANIATICNI

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0 During power operation, the Digital Data Processing System (DDPS) mal-functioned. This resulted in loss of CEA backu sition indication and the incore flux detector system used to monitor flux distxibution. ACTI:OV i itiated and newer was,

~os reduced 'Ihe DDPS was r aired and laced back into service within one hour

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This is the third occurrence involving loss of the DDPS due to the cause ~

Ola described below. See 335-78-2 and 335-78-9 1 3

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"'ic CQVPONSNT 41 CAUSE CESCAIPTIOPI AtIO CQRREC IVE AC IQPIS +22 4 The cause of the DDPS malfunction was a momentary memory failur.

The DDPS was repaired and placed back into service within one hour. Suc aenanta failures are not uncormnn in small computer systems.

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