ML19208C616
| ML19208C616 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 09/12/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 7909270144 | |
| Download: ML19208C616 (2) | |
Text
~~
'o UNITED STATES 8
gg NUCLEAR REGULATORY COMMISSION r
REGION 11 "o,
101 MARIETTA ST., N.W., SulTE 3100
....[
ATLANTA, GEORGIA 30303 g
t In Reply Refer To:
SEP 121979 RII:JP0 50-321 50-366_
,7 50~424 N Q50_425-Georgia Power Company Attn:
J.11. Miller, Jr.
Execitive Vice President 270 Peachtree Street Atlanta, Georgia 30303 Gentlemen:
Enclosed is IE Bulletin 79-23 which requires action by you with regard to your power reactor facility (tes) 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, k
James P. O'Reilly Regional Director
Enclosures:
1.
List of IE Bulletins Issued in the Last Six }ionths e
1050 123 r o co27 0,yy
SEP 121979 Georgia Power Company.
cc w/ encl:
M. Manry, Plant Manager Post Office Box 442 Baxley, Georgia 31513 C. E. Belflower Site QA Supervisor Post Office Box 442 Baxley, Georgia 31513 K. M. Gillespie Construction Project Manager Post Office Box 282 Waynesboro, Gecrgia 30830 E. D. Groover QA Site Supervisor Post Office Box 282 Waynesboro, Georgia 30830 4
1050 12:4
Accession No. 7908220104 SSINS No.:
6820 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 September 12, 1979 IE Bulletin No. 79-23 POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Description 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 differential-relay lockout on B and C phases; the B-EDG was manually stopped, thus interrupting 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 Motors (Electro-Motive Division)
Model EMD-999-20 Engine-turbocharged, 2 cycle, EMD design 20-645E4 Generator-EMD-design Model A-20 Exciter Pc
- Transformer GE-single phase Model-9T24Y1004 Serial-MD Cycles-60 KVA 15 Insulation-4160 V The manufacturer's findings and recommen.
DUPLICATE DOCUMENT are described below:
i Entire document previously "A potential problem can exist if the ne entered into system under:
i the primary windings of the excitation p 7,9,
[3? [dw -
to as the control power transformer (CPT ANO i
g No. of pages:
E 1050 125 i
,