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 D Florida Power & Light Co
To:	Moseley N C NRC/IE, NRC/RGN-II
References
PRN-LI-77-33
Download: ML18144A703 (3)

Text

P.O.BOX 013100, MIAN'll, FL 33101@~I,'"!':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 U.S.Nuclear Regulatory Commission 230 Peachtree Street, N.W., Suite 1217 Atlanta, Georgia 30303

Dear Mr.Moseley:

<EP!(p~~4+I$g~TPg'g 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, D.Schmidt Vice President Power Resources MAS/cpc Attachment

'H8gnf.%;Fife%Xr!Wca~gq Peteg" e.qua cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)Director, Office of Management Information and Program Control (3)243<~~i PEOPLE...SERVING PEOPLE CONTROL BLOCK<: 1 ucENBEE NAME F LI S L S 1,A>7 89 14 j15 LICENSEE EVENT s UCENSE BER s 0-0 0 0 8 0 UCcNSE TYPE EVENT TYPE 0 0 ii l 1 I l~0033?5.26 30 31 32 REPORT)P'E PRINT ALL REOUIRED 1¹QRtsfIATION)

CATEGORY TYPE~Q 1 00N'T~L 7 8 57 SB 59 REPORT SOURCE L.0 60 61 EVENT OESCRIPTION Jog During a weekly test of the QCCKET NUMaER EVENT CATE REPORT OATS 5 0-0 3 3 5 0 1 1 5 7 7 0 2 1 5 7 7 68 69 74 75 60 I 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 QOQ re ortable occurrence at St.Lucie Uni t 1 during which RCS cold leg temperature 80, 7 8 9 SYSTEM CAUSE COOE CQOE CQMPQNENT CQQE[oczl~vA~F.i fl s T R 0 7 8 9 10 11 12 17'AUSE OESCRIPTION jODg The RCS temperature changes were BC PA'sIE COMPO NctfT SUPPLIER COh'PQFIENT MANU FACii'F ER W 1 2 0 turbine load rejections of about 50 Hwe.J caused by 7 8 9 80[oa9]The load re'actions occurred while transferring from sequential valve control to single 7 8 9~10 EG 1 d'versa.The transfers were not as smooth as the should have OTHER S~ATUS N/A AMOUNT QF ACTIVITY N/A 7 8 9 LOGS OR OAMAGE TO FACIUTY TYPE OESCR~ION QE QZ 7 89 10 PUBLICITY 7 89 FACAriY STATUS'.C PQWFR~e~oe ol 7 8 9, 10 12 13 FORM QF ACTIVlTY CQtlTENT RELEASEQ OF REI.EASE~z~z 7 8 9 10 11 PERSONNEL EXPOSURES tIUMBER TYPE OESCRIPTiCN

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

[T~-.)Loeooj 7 8 9 11 12 PROBABLE CONSEQUENCES Q~g METHOO OF OISCCVERY 44 45 46 45 N/A N/A N/A N/A N/A OISCOVERY OESCRIPT'CN N/A LOCATION QF RELEASE N/A 80 60 7 89 AOOITIONAL FACTORS~18 See a e 2 for continuation of Event Description and Cause Description.

89l119l89 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.