ML18144A703

LER 1977-001-00 for St. Lucie Unit 1, RCS Cold Leg Temperature Exceeded 542F During Weekly Test of Turbine Control Valves

ML18144A703
Person / Time
Site:	Saint Lucie
Issue date:	02/15/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-77-33
Download: ML18144A703 (3)

Text

P. O. BOX 013100, MIAN'll, FL 33101

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FLORIDA POWER<Bi LIGHT COI.IPAi4Y February 15, 1977 PRN-LI-77-33 Mr. Norman C. Moseley, Director, Region II Office of Inspection and Enforcement <EP!(p~

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

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Dear Mr. Moseley:

tug REPORTABLE OCCURRENCE 335-77-1 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: JANUARY 15, 1977 RCS COLD LEG TEMPERATURE 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, 'H8gnf .

%;% Xr!Fife Wca~gq Peteg D. Schmidt Vice President Power Resources " e. qua MAS/cpc Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 243<

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i PEOPLE... SERVING PEOPLE

LICENSEE EVENT REPORT CONTROL BLOCK<: )P 'E PRINT ALL REOUIRED 1¹QRtsfIATION) 1 ucENBEE s UCcNSE EVENT NAME UCENSE BER TYPE TYPE F LI S L S 1,A> 0 0 0 0 8 s

0 0 0 ii l 1 I l ~0033

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7 89 14 j15 ?5 .26 30 31 32 REPORT CATEGORY TYPE SOURCE QCCKET NUMaER EVENT CATE REPORT OATS

~Q 1 00N'T L L . 0 5 0 0 3 3 5 0 1 1 5 7 7 0 2 1 5 7 7 7 8 57 SB 59 60 61 68 69 74 75 60 EVENT OESCRIPTION I

Jog During a weekly test of the turbine control valves, RCS cold leg temperature exceeded 7 8 9 BO

{003[ 542F twice. The maximum temperature reached was 543F. The RCS was above 542F for less 80 n t'wo minutes. Immediate corrective action was to reduce RCS cold le temperature 7 8 9 80 QOg in compliance with the acti'on statement of Specification 3.2.5.a. This was the first 7 89 80, QOQ re ortable occurrence at St. Lucie Uni t 1 during which RCS cold leg temperature 7 8 9 PA'sIE BC SYSTEM CAUSE COMPO NctfT COh'PQFIENT COOE CQOE CQMPQNENT CQQE SUPPLIER MANUFACii 'F ER

[oczl ~vA ~F .i fl s T R 0 W 1 2 0 7 8 9 10 11 12 17

'AUSE OESCRIPTION jODg The RCS temperature changes were caused by turbine load rejections of about 50 Hwe. J 7 8 9 80

[oa9] The load re'actions occurred while transferring from sequential valve control to single 7 8 9 EG

~10 1 d 'versa. The transfers were not as smooth as the should have 7 89 80 FACAriY METHOO OF STATUS PQWFR OTHER S ~ ATUS OISCCVERY OISCOVERY OESCRIPT'CN 9,

'.C 7 8

~e ~oe 10 ol 12 13 N/A 44 45 46 N/A FORM QF ACTIVlTY CQtlTENT RELEASEQ OF REI.EASE AMOUNT QF ACTIVITY LOCATION QF RELEASE

~z ~z N/A N/A 7 8 9 10 11 45 60 PERSONNEL EXPOSURES tIUMBER TYPE OESCRIPTiCN

~sa ~ol o o z N/A 7 8 9 11 12 13 PERS'ONi4EL INJURIES NUMBER CESCRIPTIQN

[T~-.)

7 8 9 Loeooj N/A 11 12 PROBABLE CONSEQUENCES Q~g N/A 7 8 9 LOGS OR OAMAGE TO FACIUTY TYPE OESCR~ION QE QZ N/A 7 89 10 PUBLICITY N/A 7 89 AOOITIONAL FACTORS

~18 See a e 2 for continuation of Event Description and Cause Description.

89 l119l 89 NAME. H. A. Scho man 305/552 3779 CFO 443 s 44'

REPORTABLE OCCURBEHCE 335-77-t L1CENSEE EVEHTB 4EPORT PAGE TWO Event Oescri tion (continued) exceeded 542F. (335-'77-1). ~ ~

Cause Descri tion (continued) been because of minor inaccuracies in the characteristic curves for sequential valve control and single valve control which had been set into the turbine control system. This was also the first time such a transfer was used "at high turbine. loads Permanent corrective action will be to revise the valve characteristic curves set into the turbine control system,'ased on data taken by vendor representatives on January 9-11, 1977.