ML20083H319
| ML20083H319 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 12/14/1982 |
| From: | Foster D GEORGIA POWER CO., SOUTHERN COMPANY SERVICES, INC. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-83-099-000 GN-204, PT21-83-099-000, PT21-83-99, NUDOCS 8401130152 | |
| Download: ML20083H319 (2) | |
Text
..
. Georgo Power Company Post Off;ce Box 4545 '
~3~
/
/
. rj Atlanta. Georg:a 30302 bp?
\\
\\
Telepnore 404 526-6526
,c
O P f &
. Southern Correany services. nc.
G' eorgiaP' owe"r~ ~ ' ' "n
^U Post Of face Box 2625 Birmingnam. Alabama 35202 -
Southern Comp' anyServices L reieonone 20s 870 60u
.bl 5 0 A Q,* f g D. O. Foster Vice President and General Manager Vogtic Project December 14, 1982 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II - Suite 3100 101 Marietta Street File:
X78G03-M33 Atlanta, Georgia 30303 Log:
GN-204
Reference:
Vogt
'lectric Generating Plant - Units 1 & 2 50- 24 50-425; Transamerica DeLaval Diesel Generato Governor Drive Coupling Attention: Mr. James P. 0'Reilly
-Gentlemen:
Georgia Power Company has reviewed the concern associated with the governor drive coupling of the Transamerica DeLaval Diesel Generators furnished for the Vogtle Electric Generating Plant - Units 1 & 2.
It has been concluded that a reportable _ deficiency does exist.
Enclosed is our evaluation and corrective action for this item.
A Part 10CFR21 is not being reported since DeLaval informed the Commission of this problem in their June 23, 1982 letter.
This response contains no proprietary information and may be placed in the
.NRC Public Document Room upon receipt.
Your truly,
/
W D. O. Foster DOF/CWH/skr xc:
U. S. Nuclear. Regulatory Commission Attn: Victor J. Stello, Jr., Director Office of Inspection and Enforcement Washington, D.C.
20555 R. J. Kelly D. L. McCrary
.M. Malcom R. E. Conway R. A. Thomas C. R. Miles, Jr.
G. F. Head J. A. Bailey M. Manry J. T. Beckham, Jr.
O. Batum P. D. Rice J. H. Boykin H. H. Gregory, III R. W. Staffa D. E. Dutton E. D. Groover J. L. Vota R. H. Pinson L. T. Gucwa W. F. Sanders 8401130152 821214
{DRADOCK05000 ggg my ly" hh
r
. v,o 6 i bo Evaluation for a Substantial Safety Hazard Evaluation for a Significant Deficiency Trar.samerica Delavai Diesel Generator Governor Drive Coupling Initial Report:
On October 28, 1982, C. W. Hayes of Georgia Power Company reported a potential deficiency to the NRC concerning the materials used
'for the Delaval diesel generator drive coupling.
Background:
The diesel generator governor drive coupling is an integralThe component in the Delaval diesel generators supplied for Plant Vogtle.
drive coupling must function in the high temperature, oil environment of the Coupling integrity must be maintained for the diesel engine's gear case.
generators to achieve sufficienc frequency stability. The defect is related to the material used for the coupling's drive element.
The material, an isoprene, is. designed for atmospheric use and is not suitable for use in the high temperature, oil atmosphere in the engine's gear case. The isoprene, a rubber, deteriorates rapidly and ultimately fails.
Analysis of Safety Implications: The standby diesel generators provide an emergency source of power to safety-ralated equipment to ensure continued operation following an accident occurring coincident with a loss of offsit.e power.
Because the design, materials, and service conditions of each diesel genera-tor are similar, it is reasonable to postulate a common mode failure of the governor drive coupling or both engines. While the coupling is designed
" fail safe" and mechanically locks when the flexible element fails, frequency instability could be induced with the result of the tripping of the engines.
This leads-to a loss of power to both trains of the Emergency Core Cooling System (ECCS) and most of the Engineered Safety Features (ESF) equipment.
Conclusi'on: This item' represents a deficiency which, if left uncorrected, could have affected adversely the safety of operation of the nuciaar power plant and also represents a deficiency concerning the performance of the diesels since, with this deficiency, the diesel generators may not have been able to perfom their safety function.
It has been concluded that.the use of inappropriate material for the diesel generator drive coupling represents a substantial safety hazard since the potential loss of both trains of emergency power is unacceptable.
Corrective Action: The flexible element of the governor drive coupling The will be-replaced with replacement parts available from the manufacturer.
manufacturer also has furnished a procedure for replacing the governor drive coupling, flexible element, and coupling adapter. Georgia Power Company has ordered the replacement parts. Mr. R. H. Robinson of Georgia Powar Company is responsible for the installation of the replacement parts.
It is expected that these replacement parts will be installed by March 30, 1983.