ML18113A318

LER 1976-037-00 for St. Lucie Unit 1, with Reactor Critical at 0.01 Percent Power, Control Element Assembly 50 Dropped

ML18113A318
Person / Time
Site:	Saint Lucie
Issue date:	08/10/1976
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
PRN-LI-76-205 LER 1976-037-00
Download: ML18113A318 (4)

Text

~4~O.BOX 013100, MIAMI, FLORIDA 33101 FLORIDA POWER 8L LIGHT COMPANY August 10, 1976 PRN-LI-76,-205 Mr.Norman C.Moseley, Director, Region II Office of Inspection and Enforcement U.S.Nuclear Regulatory Commission 230 Peachtree Street NN, Suite 818 Atlanta, Georgia 30303

Dear Mr.Moseley:

REPORTABLE OCCURRENCE 335-76-37 ST.LUCIE UNIT 1 DATE OF OCCURRENCE'ULY 10 1976 CEA 50 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/vh Attachment cc: Jack R.Newman, Esquire Director, Office of Inspection and Enforcement (30)Director, Office of Management Information and Program Control ('3)HELPING BUILD FLORIDA g

CONTROL BLOCK: UCEN~~NAME[oa]F L S L S 1 0 BS 14 15 REPORT REPORT , CATEGORY TYPE SOURCE~p1 ppN'T~L~L 7 8 57 58 59 60-LICENSEE EVENT REPORT (PL SE PRINT ALL REQUIRED INFORMATION)

LICENSE NUMBER UCENSE TYPE EVENT TYPE 0-0 0 0 0 0-0 0 4 1 1 1 1~03 25 26 30 31 32 OOCKET NUMBER EVENT OATE REPORT OATE 0 5 0-0 3 3 5 0 7 1 0 7 6 0 8 1 0 7 6 61 68 69 74 75 80 EVENT DESCRIPTION Qo 2 With the reactor critical at 0,01 percent power, Control Element Assembly (CEA)50 7 8 9 I dro ed.on ins ection a failed 15 volt ower su 1 was found in the control 7 8 9~o~CFA 50.The ower su 1 was re laced and the osition of CEA 50 was 7 8 9[oas]restored to within Technical Specification limits.This was the first occurrence 7 8 9 IOOI of, this t e at St.Lucie Unit 1.(335-.76-37), 80 80 80 80 7 8 9 SYSTEM CAUSE Qp7p~RB~F C 7 8 9 10 11 12 CAUSE DESCRIPTION too/The failure of a COMPONENT COOE PRME COMPONENT SUPPUER COMPONENT MANUFACTURER R D R V E N 17'3 C 4'90 N 44 47 48 15 volt power supply resulted in a loss of power to the CEA 50 80 7 8 9 Qg latchin mechanism.

The ower su 1 has been bench tested but the cause of its 80 80 7 89 FACIUTY Q~g~B~00 0 N/A 7 8 9 10 12 13 FORM OF ACTIVITY CONTENT RELEASEO OF RELEASE AMOUNT OF ACTIVITY+Z+Z N/A 7 8 9 10 11 PERSONNEL EXPOSURES'~p~o'"o""o~z" 7 89 11 12 13 PERSONNEL IN JURIES OESCRIPTION 7 8 9 11 12 METHOO OF 06COVERY OTHER STATUS OISCOVERY OESCRIPTION N/A a 44 45 46 80 LOCATION OF RELEASE N/A 44 45 80 N/A 80 N/A 80 7 8 9 80[iso]Ise the failure mechanism has not been re roducable.

PROBABLE CONSEQUENCES

[is~]7 8 9 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION Z 7 89 10 PUBLICITY 7 8 9 ADDITIONAL FACTORS~18 7 8 9 N/A N/A N/A N/A 80 80.80 80 7 89 M.A.Scho man IHoNE: 305 552-3779 80 Gpo eet.eeT t p h AA t t l..)'"J~+l