ML18110A886

LER 1977-335-19 for St. Lucie, Unit 1 RCS Cold Leg Temperature

ML18110A886
Person / Time
Site:	Saint Lucie
Issue date:	05/13/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
LER 1977-335-19
Download: ML18110A886 (5)

Text

NRC FOAM~9~-."'U.Oo NUCLEAR REGULATORY COMMISSION Ig VII)Q~...~..NRC DISTRIBUTION FoA P T 50 DOCKET MATERIAL DOCKET NUMBER 0-334 FILE NUMOF.A INCIDENT REPORT~', P.I-->-Mr.Norman C+Moseley FROM:.Florida Power&Light Company Miami,.Fla,.AD D~Schmidt.DATE OF DOCUMENT 5/13/77'ATE RECEIVED 6/13/77 AIRLETTER~ORIGINAL OCOPY DESCRIPTION ONOTOR IZED HGNCLASSIFIED g/,'I PROP INPUT FOAM ENCLOSURE NUMBER OF COPIES RECEIVED"/Mt 6"AaKNOWZ,ZDGFD

.:Licensee'Eyerit

'Report (RO'0-335/77<<19) on, 4/14/77;.cpntgrnj.ng.

RCS, Cold L'eg'emperature e 4 ,,DQNOT REMOVE',,)PLANT NAME: 't~Lucie'nit No.1,'RZL 6/14/77~.(2-P)~NOTE,.IF PERSONNEL EXPOSURE IS INVOLVED~SEND DIRECTLY TO KREGER/J, COLLINS BRANCH CHIEF: M 3 CXS FOR ACTION LIC ASSTo 8 I CYS FOR ACTION/I 0@AS NFORMATION ACRS CYS HelI185C SENTRY C~r RE EE INTERNAL D ISTRI 8UTION I&E (2 HIPC SCHROEDER/ZPPOLITO HOUSTON NOVAK/C11ECK GRIMES HANAUER TEDESCO/IIACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS LPDR: TIC: N EXTERNAL DISTRIBUTION CONTROL NUMBF R I 77 g/60028 NRC I'ORM IOII I2 1<4 P.O.BOX 013100, MIAMI, FL 33101 Qllhi FLORIDA POWER&LIGHT COMPANY ggUgq]NlCIS BL~~@Mr.Norman C.Moseley, Director, Region II Office of Inspection and Enforcement U.S.Nuclear Regulatory Commission 230 Peachtree Street, N.N., Suite 1217 Atlanta, Georgia 30303 May 13, 1977 PRN-LI-77-145 8 8/g Rc~ig<o co JUht ga)g77~i%i PSQf~II+SON gem1"~~paar~hy/

Dear Mr.Moseley:

REPORTABLE OCCURRENCE 335-77-19 ST.'LUCIE UNIT 1 DATE OF'OCCURRENCE:

', APRIL 14,'977 RCS COLD LEG TEMPERATURE The attached Licensee Event Report is being submitted in'ccordance with Technical Specification 6.9 to provide 30-day notification of the subject occurrence.

Very truly yours, A.D.chmidt 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)77i660028 PEOPLE...SERVING PEOPLE t~l E l u4 h CONTROL BLOCK: ICENSEE EVENT REPORT f PLEASE PAINT ALL REQUIRED INFORMATION) 7 89 UCENSEE NAME S L S l 14 15 UCENSE EVENT UCENSE NUMSER TYPE TYPE 0 0 0 0 0 0 0 0 0 4 1 1 1 1 L0UU3~I 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE~DOCKET NUMSEA EVENT DATE REPOAT OATS~01 CON'I~~b b 0 5 0-ol 3 3 5 0 4 1 4 7 7 0 5 0 6 7 7 7 8 57 58 59 60 61 68 69 74 75 80 I EVENT DESCRIPTION Q~2 Durin normal lant o eration ower from the SUPS was lost due to a blown inverter 89 7 89~04 manual mode.80 if of ub eco ro from theaI orna i mode o he ur i e 80 The SUPS was immediatel re-ener ized from a SOLA transformer and control 7 8 9 80 I009I'automatic control the com uter automaticall be an a transfer from se ucntial valve~eo 7 8 9 SYSTEM CAUSE CODE CODE COMPONENT CODE 77~HA~B I N 9 z R 0 0 7 8 9 10 11 12 17 43 CAUSE DESCRIPTION Qg The RCS tern erature chan es were caused FAME COMPONBIT SUPOUER CCMPONENT MANUFACTUFEA W l 2 0 N 44 47 48 s am flow chan e hi o urred w i uto-7 8 9 80 Qg ower restored.Turbine c'ontrol was then returned to automatic.

U on transferrin to 7 8 9 Qg maticall transferrin turbine valve control mode;80 This transfer was not as smooth as 7 8 9 , Q~0 re uired due to minor inaccuracies in the characteristi.c curves for se uential valve 80 OTHER STATUS NA 7 8 9 LOSS OR DAMAGE TO FACILITY TYPE OESCA,'PTKIN z 7 89 10 PUBLICITY 7 89 7 89 FACILITY STATUS%POWER~E~os o 7 8 9 10 12 13 FORM OF ACTIVITY CO@TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY[7<a]~z z NA 7 9 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE OESCAIPTION

~s~o o 0 z 7 8 9 11 12 13 PERSONNEL INJURIES KH Ltd teal 7 8 9=11 12 PROBABLE CONSEQUENCES Qg METHOD OF DISCOVERY 44 45 46 44 45 NA NA NA NA DISCOVERY DESCRIPTION NA LOCATION OF RELEASE NA 80 80 80 eo 60 eo ADDITIONAL FACTORS Q~g 7 89 io of Event Descri tion and Cause Descri tion.80 7 89 NAME:~.A.Scho man PHONE: 0 552-3802 0>0 IIIII 80 REPORTABLE OCCURRENCE 335-77-19 LICENSEE EVENT REPORT PAGE TWO EVENT DESCRIPTION (Continued) control to single valve control.This mode transfer resulted cha g hi h s d RCS old co leg temperature to exceed 542'F.RCS cold le temperature was immediately reduced to less than 542'F as Technical Specification 3.2.5.a.ss an as specified by This was the fourth occurrence during which T exceeded 542'ransfer of t bi e control ode Tw mo.o o occurred during turbine valve the SUPS (335-77-13).

and 335-77-8)and one occ r)n occurrence involved a similar loss of Corrective action had been taken due to the previously re orted New characteristic curves for o e prev ously reported occurrence.

control were obt'f es or sequential valve contro o aine rom the vendor and set into the tur i 1 ntrol and single valve However, the new curves did o e turbine control system.not produce the required results and currently being re-evaluated by the vendor.U an are available 1 h e, a etter as been promulgated to a y e ven or.Until the revised curves become emphasizing th t h o appropriate plant personnel will automaticall tra f n a w en restoring the ower for t r p urbine control, the computer transfer is made with th f db ca y trans er control to the sin le valve g ve mode, and that if the smoother (335-77-19).

e ee ack loops in servi p service, it will be significantly CAUSE DESCRIPTION (Continued) control and single valve control which have b system~w c ave been set into the turbine control