ML18127A660

LER 1978-019-00 for St. Lucie Unit 1, on 05/30/78 Concerning During Special Low Pier Feedwater Control System Test a 15% Feedwater Bypass Control Valve Inadvertently Opened Fully Causing Excessive Cooling of 1A Steam Generator

ML18127A660
Person / Time
Site:	Saint Lucie
Issue date:	06/28/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/RGN-II, NRC/IE
References
PRN-LI-78-173 LER 1978-019-00
Download: ML18127A660 (5)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEI'I < R IDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC: V. eR-C.t~'4 8P ORG: SCHMIDT A D DQCDATE: 06/28/78 NRC FL PIJR 5 LIGHT DATE RCVD: 07/07/78 DOCTYPE: LETTFR NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1

, FORWARDING LICENSEE FVENT REPT < RO 50-335/78-019) ON 05f30/78 CONCFRNING DURING SPFCIAL LOLA PIER FEEDWATER CONTROL SYSTEM TEST A 15/ FEEDWATER BYPASS l CONTROL VALVE INADVERTFNTLY OPENED FUI LY CAUSING EXCESSIVE COOLING OF iA STEAM GENERATOR.

PLANT NAME: ST LUCIE )I:1

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INCIDENT REPORTS

<DISTRIBUTION CODE A002)

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FLORIDA POWER 8I LIGHT COMPANY June 28, 1978, PRN-L I-78+? 3 rn Mr. James P. O'Reilly, Director, Region II CU4= f>l Office of Inspection and Enforcement C/l E"s ~

U. S. Nuclear Regulatory Commission ~V)

V 0 mal 230 Peachtree Street, N. 11., Suite 1217 MORI

~UJ Atlanta, Georgia 30303 n =I Pl CO n

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-19 ST.LUCIE UNIT 1 DATE OF OCCURRENCE: MAY 30 1978 TECHNICAL SPECIFICATION 3.1.1.5 RCS AVERAGE 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. I 4

Very truly yours,

. Schmidt Vice President Power Resources MAS/pa Attachment cc: Harold F. Reis, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 781880119 PEOPLE... SERVING PEOPLE

NRC FORM SEB U S NUCLEAR REOULATORY COMMISSION IT TTI LICENSEE EVcHT REPORT CONTROL Sl CCKI I I I I I QI lPLBASB PRINT OR TYP AI.L, REQUIRED INFORMATIONI I

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This was the first occurrence of this type at St. Lucie...

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~ssz 44 41 o A vendor ro osed modification of the 15% Feedwater Control System was tem-poraril installed on the A loop for feasibility testing (to.improve stabil it . of the automatic mode). Gain settings based on analytical'results roved to be unrealistic and caused the bypass valve to open. The settings were chan ed to allow corn letion of the test.

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2:0 IQ44 N/A NAMBOF PREPARER M. A. Scho man (305) 552-3802