ML20035B713
| ML20035B713 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/24/1993 |
| From: | Woodward J SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9304050027 | |
| Download: ML20035B713 (5) | |
Text
Sou* tem Nuclear Operaung Company Post Offce Box 1295 Birmingham, Alabama 35201 TekT "ane 205 8085086 k
L Southern Nudear. Operating Company
.i. D. woocard kceP' the soutnem electac s, stem t
10 CFR 50.36 March 24, 1993 Docket Nos. 50-348 50-364 U. S. Nuclear Regulatory Commission A1TN: Document Control Desk Washington, DC 20555 Joseph M. Farley Nuclear Plant Annual Diesel Generator Reliability Data Report Gentlemen:
Provided as Attachment 1 is the Annual Diesel Generator Reliability Data Report which is submitted in accordance with Technical Specification 6.9.1.12. This report provides the number of tests (valid or invalid) and the number of failures for each diesel generator at Farley Nuclear Plant for 1992. Attachment 2 provides the information identified in Regulatory Position C.3.b of Regulatory Guide 1.108, Revision 1,1977, for the failure.
Please advise if you want additional information or have any questions.
Respectfully submitted, b
M Woodard DRC:cht-DG-AR.DRC NEL-93-0112 0049 Attachments cc: Mr. S. D. Ebneter i
Mr. G. F. Wunder Mr. G. F. Maxwell 00
}
9304050027 930324 l' )
{
j i
PDR ADOCK 0500 8
R d
ATTACHMENT 1 ANNUAL DIESEL GENERATOR RELIABILITY DATA REPORT FOR 1992 f
i i
i h
l l
i i
l ANNUAL DIESEL GENERATOR RELIABILITY DATA REPORT FOR 1992 i
Diesel Generator 1-2A IB 2B 1C 2C TOTAL Valid Successful 40 36 38 36 33 183 i
Tests i
Invalid Tests 19 18 7
15 23.
82 f
Valid Failures 0
0 0
0 1
1 Invalid Failures 0
0 0
0 0
0 This diesel generator (DG) reliability data report for 1992 is submitted in accordance with
)
Technical Specification 6.9.1.12. The table above shows the number of tests (valid or invalid) and the number of failures for each of the five DGs at Farley Nuclear Plant.
{
I I
i t
+
l i
t ATTACHMENT 2 INFORMATION IDENTIFIED IN REGULATORY POSITION C3.B OF l
REGULATORY GUIDE 1.108, REVISION 1,1977 i
a F
1
-3 t
i s
t l
a
l 2C DG FAILURE ON 08-20-92 i
The 2C diesel generator was removed from service for various maintenance tasks. During the l
maintenance outage, the diesel generator was started at 0755 on 08/20/92 and failed to reach rated voltage in the time required by Technical Specifications. This was due to the inability to control voltage from the Emergency Power Board (EPB).
Investigation revealed that the voltage adjust switch contacts on the EPB were operating intermittently, and also the automatic voltage control relay had an open coil. The intermittently operating contacts and the relay coil were replaced. The diesel was re-tested with satisfactory results. An FNP maintenance history search was performed, which~ indicated that this was a singular failure.
The 2C diesel generator was returned to service at 1830 on 08/21/92. This failure was the l
first failure in the last 100 valid tests. The surveillance test interval remained at once per 14 j
days, which is in conformance with the schedule of Regulatory Position C.2.d in Regulatory i
Guide 1.108, Revision 1, August 1977.
l l
i
[
[
i i
?
i f
I i
~