ML19208C716
| ML19208C716 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/12/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 7909270270 | |
| Download: ML19208C716 (1) | |
Text
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UNITED STATES E '*3.,3(/,(',,n.
NUCLEAR REGULATORY COMMISSION r# ',,h5h N.. ["2 h?
REGION V 1990 N. CALIFORNI A BOULEVARD t, k.
.J, ' oU SUITE 202, WALNUT CREE K PLAZA 4...*
WALNUT CHEEK, CALIFORNIA 94596 September 12, 1979 Docket Nos. 50-528 50-529 50-530 Arizona Public Service Company P. O. Box 21666 Phoenix, Arizona 83036 Attention: Mr. E. E. Van Brunt, Jr.
Vice President, Construction Projects Gentlemen:
Enclosed is IE Bulletin 79-23 which requires action by you with regard to your power reactor facility (ies) with an operating license or a construction permit.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely,
{$ff&zCSw R. H. Engelken Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six !!onths cc w/ enclosures:
F. W. Hartley, APS 1049 181
'7909230g 0 O
Accession ilo. 7908220104 SSINS No.:
6820 UNITED STATES NUCLEAR REGULATORY COMMISSIO:t 0FFICE OF IflSPECTION AND Ef4FORCEMErlT WASHI!iGTON, D.C.
20555 September 12, 1979 IE Bulletin No. 79-23 POTENTIAL FAILURE OF EMERGEilCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Descriotion of Circumstances:
Florida Power and Light Company recently reported a problem encountered during a 24-hour full load test of the emergency diesel generators (EDG) at their Turkey Point facility.
Approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> into the test, the A-EDG tripped due to a differ.. N - %iay lockout on B and C phases; the B-EDG was manually stopped, thus i: tert %'49 the test at that point in time.
Subsequent investigation and testing by the licensee revealed a design error on both the A and B EDGs which resulted in overheating of the Exciter Power Transformers (EPTs) at sustained high load operation.
The following nameplate data applies to the equipment installed at Turkey Point:
Emergency Diesel Generator General flotors (Electro-Motive Division)
Model EliD-999-20 Engine-turbocharged, 2 cycle, EMD design 20-645E4 Generator-EMD-design Model A-20 Exciter Power Transforrer_
GE-ningle phase Model-9T24Y1004 Serial-MD Cyc1cs-60 KVA 15 Insulation-4160 V The manufacturer's findings and recommendations regarding the above problem are described below:
"A potential problem can exist if the the primary windings of the excitatio.
DUPLICATE DOCUMENT to as the control power transformer (i bL an the neutrals, or a connection are equally undesirable conditions.
Entire document previously ditions exist, high circulating curre; entered into system under:
nts may exceed transformer ratin.
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