ML18127A653

LER 1978-010-00 for St. Lucie Unit 1, One Channel of Steam Generator Low Pressure Measurement for Main Steam Isolation Signal Failed Requiring Action in Accordance with Technical Specification 3. 3. 2. I. B

ML18127A653
Person / Time
Site:	Saint Lucie
Issue date:	07/14/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/RGN-II
References
PRN-LI-78-0190 LER 1978-010-00
Download: ML18127A653 (7)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM <RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: QREILLY J P ORG: SCHMIDT A D DQCDATE: 07/14/78 NRC FL PWR 8( LIGHT DATE RCVD: 07/3i/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR i ENCL i FORWARDING UPDATED LICENSEE REPT (RO 50-335/78/Oi0) ON 03/26/78 CONCERNING ONE CHANNEL OF STEAM GENERATOR LOW PRESSURE MEASUREMENT FOR THE MAIN STEAM ISOLATION SIGNAL FAILED'EQUIRING ACTION IN ACCORDANCE WITH TECH SPEC

3. 3. 2. i. B.

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

++~+++~~++++~++++ DISTRIBUTION QF THIS MATERIAL IS AS FOLLOWS 4+M>+++>>4>>+>4>>

INCIDENT REPORTS (DISTRIBUTION CODE A002)

FOR ACTION: BR F ORBN4 BC~~+W/4 ENCL INTERNAL: REG FILE +W/ENCL NRC PDR+4W/ENCL

/2 ENCL MIPC~~W/3 ENCL I h C SYSTEMS BR++W/ENCL EMERGENCY PLAN BR4+W/ENCL NOVAK/CHECK++W/ENCL EEB+>W/ENCL AD FOR ENG~<W/ENCL PLANT SYSTEMS BR44W/ENCL HANAUER+>W/ENCL AD FOR PLANT SYSTEMS>>W/ENCL AD FQR SYS 0 PROJ+4W/ENCL REACTOR SAFETY BR<<W/ENCL ENGINEFRING BR+wW/ENCL VQLLMER/BUNCH%+8/ENCL KREGER/J. CQLLINS4+W/ENCL POWER SYS BR+wW/ENCL K SEYFR IT/IE+~W/ENCL EXTERNAL: LPDR S FT PIERCE. FL~~W/ENCL TIC, LIZ CARTER++W/ENCL I

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FLORIDA POWER 5 LIGHT COMPANY July 14, 1978 PRN-LX-78-190 Mr. James P. O'Reilly, Director, Region XX Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 1217 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-10 CA ST. LUCXE UNXT 1 DATE OF OCCURRENCE: MARCH 26, 1978 STEAM GENERATOR PRESSURE-LOW UP DATE REPORT NO. 1 The attached Licensee Event Report is being submitted to update our initial report of April 25, 1978.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/cpc Attachment CC Harold F. Reis, Esquire Director, Office of Xnspection and Enforcement (30)

Director, Office of Management Xnformation and Program Control (3) 782140093 PEOPLE... SERVING PEOPLE

SEE ~ENT RE) OR l ~ APRILINITIAL 25 REPORT 1978

~) CONTROL BLOCK: l (PLEASE PR)NT ALL REQUIRED INFQRMATIQ)1)

UP DATE /31 UCENScC UCENSE EVENT NAhIE uCENSE NUMSER TYPE TYPE F L S L S l. 0 o 0 o o o o o OJ 1 1 1 1 09 14 15 25 26 30 31 32 Rcnorrr nEPOnr CATECOAY TYPE'OURCE OOCICET N1>hISEA EVENT OATS REPQAT CATE Q)1 CON'T LLJ lL I 0 5 0 0 3 3 5 0 3 2 6 7I 8 0 7 1 4 7 8 7 8 57 50 59 60 6'I 68 69 74 75 60 I

EVENT OESCRtPTION

~OI2 One channel of steam generator low.pressure measurement for the Hain Steam Isolation 89 60 Signal failed, requiring ACTIO'l in accordance with Specification 3.3.2.l.b The channel 7 89 ' 60

~0 4 was b assed, re aired and returned to ervice in 3 1/2 hours which is well within the 7 0 9 80 J5 48-hour limit for bypass oper~tion. (78-335-10).

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48 10 '11 12 CAUSE OESCRIPT(OI'I The power supply (Power Hate 15V, 300 ma DC) f. Iiled, apparently at the encl of its 7 8 9 00 0

LG 9 normal service life. It was replaced ancl th< channel calibratecl properly. Power supply

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[J1JO units for all other channels were checked and several were replaced.

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N/A J'/A 7 8 9 80 LOSS OR OAMAGE TO FACIUTY

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/Lvl0 L ~ 60 AGDITIO)~lAL FACTORS ep for continuation of Cause 'Descri >tion.

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t REPORTABLE OCCURRENCE 335-78-10 LICENSEE EVENT REPORT UPDATF. (/1 PAGE TWO CAUSE DESCRIPTION (Continued)

Although a failure of this type leads to. a conservative situation (channel trip), a design change request has been submitted to improve reliability and reduce maintenance on the power supplies. Completion of the design change will be reported in accordance with 10 CFR 50.59.