ML18113A281

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

ML18113A281
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 LER 1977-001-00
Download: ML18113A281 (7)

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Miami., Fla Co DATE OF DO/UPQN$

A D Schmidt DATE RECEIVED 3 4 77

@LETTER C3NOTORIZED PROP INPUT FORM NUMBER OF COPIES RECEIVED QFOR I G INAI J8fU/4 C LASS I F I E D QCOPY one signed DESCRIPTION ENCLOSURE Ltr trans the following: Licensee Event Report (ROID 77-1) on 1-15.-77

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concerning exceeding of tech specs'imits re RCS cold leg temperature.....'......

2p A.CKNOWLEDGED.

St Lucie f/1 PLANT NAME:

,gP @QT H,EMOVK NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DXRECTLY TO KREGER/J, COLLINS FOR ACTION/INFORMATION 3-10-77 8}1 BRANCH CHEEP: em Pln

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=KREGER/J COLLINS EXTERNAL OISTRIBUTION CONTROL NUMBER LPDR!

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DOCere USggq FLORIDA POWER & LIGHT COMPANY

<'N7@ February 15, 1977

++@It IO 5o4OI Oc i1 PRN-LI-77-33 Mr. Norman C. Moseley, Director, Region Office of Inspection and Enforcement II ~cpppy &

U. S. Nuclear Regulatory Commission .u, 230 Peachtree Street, N. W., Suite 1217 Atlanta, Georgia 30303 /~>y~>>

Dear Mr. Moseley:

lj 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 cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

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

PEOPLE... SERVING PEOPLE

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LICENSEE EVENT REPORT CONTROL BLOCK: BE PRwT aLL REauIRED INFoRMaTIam) ucENsEE ucENsE EVENT NAME LICENSE NUMBER TYPE TYPE 0 L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~03 89

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7 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE ~

OQCKET NUMBER EVENT OATE REPORT OATE

~0> coNT L L 0 5 0 0 3 3 5 0 1 1 5 7 7 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION Jog Durin a weekly test of the turbine control valves, RCS cold leg temperature exceeded 7 8 9 80

~03 542F twice. The maximum temperature reached was 543F. The RCS was above 542F for less 7 8 9 80 two minutes. Immediate corrective action was to reduce RCS cold le temperature 89 80 Jog in compliance with the action statement of Specification 3.2.5.a. This was the first 7 8 9 80

) QOg re ortable occurrence at St. Lucie Unit 1 durin which RCS cold leg temperature 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT CORAPONENT CQOE COOE COMPONENT CODE SUPPLER MANUFACTURER

[007J ~HA F 1 N S T R 0 0 W 1 2 0 7 8 9 10 11 12 17 47 48 CAUSE DESCRIPTION Jag The RCS temperature changes were caused by turbine load rejections of about 50 Mwe.

7 8 9 80 QOg The load re'ections occurred 'while transferring from sequential valve control to single 7 8 9 80

~10 89 d 'versa. The transfers were not as smooth as the should have 7 80 FACiuTY METHOO OF STATUS 55 POWER OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION Jig 7 8 9

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12 13 N/A 44 45 46 N/A FORM OF 80 ACTIVITY COATENT RELEASEO OF RELEASE AMOUNT QF ACTIVITY LOCATiON QF RELEASE G~H LzJ LzJ N/A N/A 7 8 9 10 11 44 45 60 PERSONNEL EXPOSURES NUMBER TYPE OESCRPTiON Pg ~oo 7 8 9 o ~z 12 N/A 11 13 80 PERSONNEL INJURIES DESCRIPTION

~4 0 0 0 N/A 7 8 9 11 12 80 PRPlI~LE CDNSEGIUENCES Q~g N/A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE OFSCRlPTIQN

~16 ~Z N/A 7 89 10 80 PUBLICITY N/A 7 89 .80 ADDITIONAL FACTORS Q~g See a e 2 for continuation of Event Description and Cause Description.

7 89 80 7 89 80 M. A. Scho man PHON .305/552-3779 OPO IIIII~ 6 gT

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REPORTABLE OCCURRENCE 335-77-1 LICENSEE, EVENT REPORT PAGE TWO Event Descri 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 load. Permanent corrective action will be to revise the valve characteristic curves set into the turbine cont'rol system, based on data taken by vendor representatives on January 9-11, 1977.