ML18113A252

LER 1977-009-00 for St. Lucie Unit 1, Digital Data Processing System Computer Went Off the Line Because of Memory Disk Content Error, Resulting in Loss of CEA Pulse Counting Position Indication

ML18113A252
Person / Time
Site:	Saint Lucie
Issue date:	03/17/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-77-69 LER 1977-009-00
Download: ML18113A252 (8)

Text

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\ MIAMI, FLORDIA 3/17/77 A.D. SCHMIDT DATE RECEIVED 4/6/77 LETTER QNOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED ABORIGINAL Q'UNCLASSIF IED C3COPV

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DESCRIPTION ENCLOSU BE LTR. TRANS THE FOLLOWING....... LICENSEE EVENT REPORT FOR. RO.// 77-9, ON2/15/

77 CONCERNING THE DIGITAL DATA PROCESSING SYS TEM COMPUTER. GOING OFF THE LINE BECAUSE OF MEMORY DISK CONTENT ERROR.....

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~ vR LS Mr. Norman C. Moseley, Director, Region kQ Office of Inspection and Enforcement U. S. Nuclear Regulatory .Commission 230 Peachtree Street,:N. N., Suite 1217 Atlanta, Georgia 30303"'9 gegulaeog gIIo Pv.

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-77-9 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: FEBRUARY 15, 1977 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/cpc Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 77>f$ 'vASA PEOPLE... SERVING PEOPLE

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LICENSEE EVENT REPORT CONTROL 8LOCK: [PLEASE PAINT ALL REQUIRED INFORMATION)

UCENSEE UCENSE EVENT NAME UCENSE NUMBER TYPE TYPE

[001j F L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~03

.7 89

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14 15 25 26 30 31 32 REPORT AEPOAT CATEGORY TYPE SOURCE ~

OOCKET NUMBEA EVENT: OATS REPOAT OATE

[oa~]corn ~L ~L 0 5 0 0 0 2 1 5 7 7 0 1 7 7 8 57 58 59 60 68 69 74 75 80 EVENT DESCRIPTION

~02 7 8 9 ff i 80

[003] disk content error. This resulted in the loss of CEA ulse counti osition indication 7 89 80 tOD4] All reed switch osition indication channels were verified o erable and all CEA's'ere 7 8 9 80

@0m 7 8 9 wi drawn. Also lost was the incore flux monitorin s stem. This re uired use'f 80 Q~ 6 the excore monitori s stem .and re uired a reduction in ower to ensure the Axial Sha e 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COMPONENT COBE COOE COMPONENT COOE SUPPLER MANUFACTURER VGIATION IH he&

7 8 9 10 11 12 X X 17 A

43 44 F 1 2 0 47 N

48 CAUSE DESCRIPTION A new ro ram that was bein tested caused the DDPS to halt because of failure of the 7 8 9 80 7 8 9 m f r s r r 80

, Q~ 0 word missi from the disk ro ram stora e. This error was corrected and the DDPS was 7 89 80 METHOD OF OTHER STATUS OISCOVERY OISCOVEAY OESCRIPTION NA 7 8 9 10 12 13 44 45 46 FORM OF ACTIVITY COATENT RELEASEO OF AELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE EH L~J L~l NA NA 7 8 8 10 11 44 45

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PERSONNEL EXPOSURES EG3 LZJ 7 89 11 12 13 PERSONNEL INJURIES NUMBER OESCRIPTION

~~4 ~00 0 7 89 11 12 80 PROBABLE CONSEQUENCES

'arl NA

'7 89 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION

~16 Z NA

'7 8 9 10 80 PUSUCITY NA 7 89 .80 ADDITIONAL FACTORS for continuation of Event Descri tion and Cause Descri tion.

7 89 80 7 89 60 NAME: M. A. Scho man PHONE: 0 2- 77 GF0 Sdt

1 REPORTABLE OCCURRENCE 335-77-9 LICENSEE EVENT REPORT PAGE TV(0 EVENT DESCRIPTION (Continued)

Indexes (ASI.'s ) were in accordance with specification 4.2.1.3. This was the first occurrence of loss of %he DDPS when reactor power was high enough for compliance with this specification to 'be a concern. The DDPS was returned to service within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. This was the fifth time the DDPS has been lost (Reportable Occurrences 335-76-19, 335-76-27, 335-76-38, and 335-76-$ 8) due to various causes.

(>>5-77-9)

CAUSE DESCRIPTION (Continued) returned to operation within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. A previous incorrect computer-to-disk transfer caused the word to be missing from the disk. The computer memory contents were correct, but the disk content error had not been found since this was the first time that the program storage area of the dis'k had 'been accessed.

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