ML18113A287

LER 1976-048-00 for St. Lucie Unit 1, Due to Faulty Switch on Operator'S Console an Interrupt Signal Was Sent to Central Processing Unit Causing Digital Data Processor to Halt

ML18113A287
Person / Time
Site:	Saint Lucie
Issue date:	01/14/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-77-16 LER 1976-048-00
Download: ML18113A287 (8)

Text

195 U.S. NUCLEAR REGULATORV COM ION DOCKET NUMBER NRC FORM, I2. 76) 'c j ~

50-335 FILE NUMBER NRC DISTRIBUTION FQR PART 50 DOCKET MATERIAL INCIDENT REPORT TO: N.C. MOSELEY FROM: FLORDIA PWR 6 LIGHT CO ~ DATE OF DOCUMENT MIAMI, FL. 1/14/77 A. D. SCHMIDT DATE RECEIVED 1/25/77 ABORIGINAL OLETTER ONOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED 9 UN C LASS IF I E D OCOPV DESCRIPTION ENCLOSURE LTR. TRANS THE FOLLOWXNG....... LICENSEE EVENT REPORT FOR R.O./I 76/48> ON 12/14/76 CONCERNXNG AN INTERRUPT SIGNAL THAT WAS SENT TO THE CONTRAL PROCESSING UNIT CAUS-ING THE DXGITAL DATA PROCESSOR TO HALT....

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( 1 SXGNED CY. RECEIVED)

( 3 PAGES)

ACKNOWLEDGED PLANT NAME: ST. LUCIE N 1 Do

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OVg NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION BRANCH CHIEF:

W 3 CYS FOR ACTXON LIC ~ ASSTo:

W CYS ACRS 16CYS X NT INTERNAL 0 IST Rl BUTION NRC PDR I 6 E (2)

MXPC SCHROEDER/IPPOLITO HOUSTON NOVAE/CHECK GRIMES CASE BUTLER EEANAUER TEDESCO/MACCARY EXSENHUT BAER SHAO VOLLMER/BUNCH KREGER/J ~ COLLXNS EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR0 TXC:

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857 NRC FOflM 195 I2 lGI

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Regulatory F.l]o Gy< .O. BOX 013100, MIAMI, FL 33101 r~

Cy O'I 4'lt 0 t'IEO RC FLORIDA POWER & LIGHT COMPANY RR137i/p January 14, 1977 MdI SeetIoq Ooc4I Qeg PRN-LI-77-16 b.':.

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(/gyp Mr. Norman C. Moseley, Director, Region II Qt Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Q 230 Peachtree Street, N. W., Suite 1217 Atlanta, Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-76-48 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: DECEMBER 14, 1976 BACKUP CEA POSITION INDICATION The attached Licensee, Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30-day notification of theisubject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/cpc Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management, Information and Program Control (3)

PEOPLE... SERVING PEOPLE

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CENBEE EVENT REPORT CONTQOL 8LOCK: [PLEASE PRINT ALL RECIOIRED INFORMATIDN)

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UCENSEE UCENSE EVENT LNAMg cg UCENSE NUMBER TYPE TYPE

[OD1] F L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1

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,7 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT. OATE REPORT OATE

~01 OON'1 7 8 57 58

~L 59 '0 L 61 0 5 0 0 3 3 5 68 69 1 2 1 4 7 6 74 0

75 1 1 4 80 EVENT OESCRIPTION Qo2 Due to a fault switch on the o erator ' console a i 7 8 9 80

{OO~] sent to the Central Processin Unit (CPU) causin the Di ital Data 7 89 80

~0 4 Processor (DDP) to halt. This resulted in the loss of CEA ulse countin 7 8 9 80 Qp 5 position indication. All reed switch position indicator channels were 7 8 9 Qpg verified operable. The DDP was returned to service in one hour. Backu Sa 89, PANE 80 SYSTEM 'AUSE COMPONENT COMPONENT COOE COOE COMPONENT COOE SUPPUER MANUFACTURER VCLATION

~07 ~XX ~E X X X X X X A F 1 2 0 ~N 7 8 9 10 11 12 17 43 44 48 CAUSE OESCRIPTION

'[ppsj The switch for the number six pushbutton on the operator's console was 7 8 9 80 Jog defective, causing a false interru t si nal to be sent to the CPU.

7 8 9 80

[iiaj 7 89 80 FACIUTY METHOO OF STATUS POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTICN

@171 ~E ~03 2 N A N A

,7 8 9 10 12 13 44 45 46 80 FORM OF ACTIVITY COATENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Q~g z z N A N A

'7 8 9 10 44 45 11 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION

~10 ~OO 0 ~Z N A 7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER OESCRIPTION

~00 o N/A 7 89 11 12 80 PROBABLE CONSEQUENCES

[<is] N A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION 7

CE89LzJ 10 80 PUBLICITY N A 7 8 9 ~ 80 AOOITIONAL FACTORS t11I8 See page two for continuation of Event Description.

7 8 9 80 7 89 80 M. A. Schoppman PHONE.3 05/552-37 79 GPO 661 ~ 667

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J REPORTABLE OCCURRENCE 335-76-48 LICENSEE EVENT REPORT PAGE TWO Event Description (cont'inUed)

CEA position indication was lost on three 'previous occasions (Reportable Occurrences 335-76-19, 335-76-27, and 335-76-38),

however, the occurrence described in the present report was the first one caused by a faulty switch on, the operator's console.

(335-76-48)

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