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~

Ig VII) Q

~ ..

' ~

U.Oo NUCLEAR REGULATORY COMMISSION DOCKET NUMBER 0- 334 FILE NUMOF.A

~ ', P.

. NRC DISTRIBUTION FoA P T 50 DOCKET MATERIAL FROM:

.Florida Power & Light Company INCIDENT REPORT DATE OF DOCUMENT I Miami, . Fla,.

5/13/77'ATE

-->- Mr. Norman C+ Moseley RECEIVED AD D~ Schmidt . 6/13/77 AIRLETTER ~ ONOTOR IZED PROP INPUT FOAM NUMBER OF COPIES RECEIVED ORIGINAL OCOPY DESCRIPTION HGNCLASSIFIED ENCLOSURE

"/Mt 6

g/,

'I

.:Licensee'Eyerit 'Report (RO'0-335/77<<19) on, "AaKNOWZ,ZDGFD 4/14/77; .cpntgrnj.ng. RCS, Cold L'eg 'emperature e 4

,,DQNOT REMOVE ',,)

'tPLANT NAME:

~ Lucie'nit No. 1,'

~

.(2-P) ~

RZL 6/14/77 NOTE,. IF PERSONNEL EXPOSURE IS INVOLVED

~

SEND DIRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION BRANCH CHIEF:

M 3 CXS FOR ACTION LIC 8 I ASSTo CYS 0 @AS ACRS CYS HelI185C SENTRY C~r INTERNAL D ISTRI 8UTION RE EE I&E (2 HIPC SCHROEDER/ZPPOLITO HOUSTON NOVAK/C11ECK GRIMES HANAUER TEDESCO/IIACCARY EISENHUT BAER SHAO VOLLMER/BUNCH KREGER/J COLLINS EXTERNAL DISTRIBUTION CONTROL NUMBF R LPDR: I TIC:

N 77 g / 60028 NRC I'ORM IOII I2 1<4

P. O. BOX 013100, MIAMI, FL 33101 Qllhi FLORIDA POWER & LIGHT COMPANY May 13, 1977 PRN-LI-77-145 NlCIS BL~ ~@

ggUgq] 8 8

/g Rc~ig<o co JUht ga )g77 Mr. Norman C. Moseley, Director, Region II ~i%i PSQf~ II gem1+SON "~~paar ~

Office of Inspection and Enforcement hy /

U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. N., Suite 1217 Atlanta, Georgia 30303

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 with Technical Specification 6.9 to provide 30-day in'ccordance 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 ICENSEE EVENT REPORT CONTROL BLOCK:

fPLEASE PAINT ALL REQUIRED INFORMATION)

UCENSEE UCENSE EVENT NAME UCENSE NUMSER TYPE TYPE 89 S L S l14 0 0 0 0 0 0 0 0 0 4 1 1 1 1 L0UU3~I

~

7 15 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 80 7 89 if of ub eco ro from theaI orna i mode o he ur ie 80

~04 manual mode. The SUPS was immediatel re-ener ized from a SOLA transformer and control 7 8 9 80 Qg ower restored. Turbine c'ontrol was then returned to automatic. U on transferrin to 7 8 9 80 I009I 'automatic control the com uter automaticall be an a transfer from se ucntial valve~

7 8 9 FAME eo SYSTEM CAUSE COMPONBIT CCMPONENT CODE CODE COMPONENT CODE SUPOUER MANUFACTUFEA 77 7

~HA 8 9 10

~B 11 12 I N 9 z R 0 17 0

43 44 W l 2 0 47 N

48 CAUSE DESCRIPTION Qg8 7 9 The RCS tern erature chan es were caused s am flow chan e hi o urred w i uto-80 Qg maticall transferrin turbine valve control mode; This transfer was not as smooth as 7 8 9 80

, Q~ 0 re uired due to minor inaccuracies in the characteristi.c curves for se uential valve 7 89 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 7 8 9

~E ~os o NA 44 NA 10 12 13 45 46 80 FORM OF ACTIVITY CO@TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

[7<a] ~z z NA NA 7 9 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCAIPTION

~s ~o o 0 z NA 7 8 9 11 12 13 PERSONNEL INJURIES KH Ltd teal NA 7 8 9 =

11 12 eo PROBABLE CONSEQUENCES Qg 7 8 9 60 LOSS OR DAMAGE TO FACILITY TYPE OESCA,'PTKIN z NA 7 89 10 eo PUBLICITY NA 7 89 ADDITIONAL FACTORS Q~g io of Event Descri tion and Cause Descri tion.

7 89 80 7 89 80 NAME: ~. A. Scho man PHONE: 0 552-3802 0>0 IIIII

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 coold leg temperature to exceed 542'F. RCS cold le temperature was immediately reduced to less ss thanan 542'F as specified by Technical Specification 3.2.5.a.

This was the fourth occurrence during which T exceeded of t bi e control moode . Two o occurred during turbine valve 542'ransfer and 335-77-8)) and one occ r n occurrence involved a similar loss of the SUPS (335-77-13).

Corrective action had been taken due too thee prev previously re orted occurrence.

ously reported New es for characteristic ' curves i 1 valve contro or sequential ntrol and single valve control were oobt aine from the vendor and set intoo thee turbine tur control system.

However, the new curves did not produce the required results an and are currently being re-evaluated byy thee ven or. Until vendor. U the revised curves become availablee, a 1 etter h as been promulgated too appropriate a plant personnel n th a t wh en restoring the p ower for t urbine emphasizing r control, the computer will automaticall tra fer control to the sin g le valve ca y trans ve mode, and that if the transfer is made with th e fee db ack loops service, it will be significantly p in servi smoother (335-77-19).

CAUSE DESCRIPTION (Continued) control and single valve control which w c haveave been b set into the turbine control system~