ML20234C408
| ML20234C408 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 09/23/1987 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 87-001, 87-1, SL-3247, NUDOCS 8709210277 | |
| Download: ML20234C408 (4) | |
Text
- z. s Georgis Power Company 3L 333 Piedmont Avenue
~ Atlanta, Georgia 30308 Telephone 404 526-6526 Mailing Address:
Post Office Box 4545 Atlanta. Georgia 30302 L'
Georgia Power L. T. Gucwa the sauthem electnc system M anager Nuclear Safety and Licensing i
SL-3247' I
0520m X7GJ17-V540 September 23, 1987-U. S. Nuclear Regulatory Commission ATTN: Document Control-Desk Washington, D.'C.
20555 PLANT V0GTLE - UNIT 1 NRC DOCKET 50-424 OPERATING LICENSE NPF-68 SPECIAL-REPORT 87-001 VALID DIESEL GENERATOR FAILURE j
MECHANICAL GOVERNOR MALFUNCTION Gentlemen:
In accordance with the requirements of the. Plant Vogtle.
Unit 1:
Technical Specifications section-4.8.1.1.3 and 6.8.7,~ Georgia ' Power Company is submitting the enclosed Special Report (SR) concerning a. valid diesel generator failure.
Sincerely, N
E
/.(w L. T.-Gucwa
'l LGB/lm h
Enclosure:
SR 50-424/1987-001 c:
(see next page)
')
8709210277 870923 P
PDR ADOCK 05000424'.
% s
..1 S
PDR r,
f 4w }
8),
-li
i i
(Jecn];ia Poaver Jr\\
1 U. S. Nuclear Regulatory Commission September 23, 1987
(
Page Two 1
c: Ggoraia Power Comoany 1
Mr. R. E. Conway Mr. J. P. O'Reilly Mr. G. Bockhold, Jr.
Mr. J. F. D'Amico Mr. C. W. Hayes G0-NORMS Southern Comoany Services Mr. R. A. Thomas Mr. J. A. Bailey 1
l Shaw. Pitimts. Potts & Trowbridge Mr. B. H. Churchill, Attorney-at-Law l
Irgutm3L_ san _iers. Lockerman & Ashmore Mr. A. H. Domby, Attorney-at-Law U. S. Nuclear Regulatory Commission l
Dr. J. N. Grace, Regional Administrator Ms. M. A. Miller, Licensing Project Manager, NRR (2 copies)
Mr. J. F. Rogge, Senior Resident Inspector-Operations, Vogtle l
l Georaians Aaainst Nuclear Energy Mr. D. Feig Ms. C. Stangler 1
l 0520m nwns
k Georgia Power n ENCLOSURE 1 SPECIAL REPORT 87-001 A.
REQUIREMENT FOR REPORT This report is required in accordance with the. Plant Vogtle -
Unit 1 Technical Specifications section 4.8.1.1.3.
This section I
of the Technical Specifications requires that - all diesel l
generator failcres, valid or nonvalid, shall be reported to the Commission in a Special Report pursuant to Specification-6.8.2.
within 30 days.
l B.
UNIT STATUS AT TIME OF EVENT 1
On August 24, 1987, Plant Vogtle - Unit - 1 was in mode 1 at approximately 100 percent of rated thermal power.
C.
DESCRIPTION OF EVENT The affected diesel generator was the Plant Vogtle - Unit 1 train A diesel generator (DG1A).
This was the first valid failure of DG1A in eleven valid start attempts since Plant Vogtle - Unit i received its operating license on January 16, 1987.
On August 24,
- 1987, DG1A was started for its monthly surveillance.
The engine tripped on overspeed shortly after the start was initiated.
The engine was secured and a preliminary investigation was performed by the system engineer which revealed no obvious problems.
Daiciency card 18702205 and Maintenance Work Order (MHO) 18709241 were initiated to investigate and correct the problem.
Several devices were checked during the investigation j
including:
verification of a signal at the mechanical governor from the electrical governor, governor drive coupling, and free I
movement of the fuel racks; all with acceptable results.
To verify proper operation of the mechanical governor, the engine was started with the Delavel service representative and system engineer observing the governor reaction.
The engine. tripped on 0520m El-1
/]/
9/23/87 SL-3247 J /
\\\\
g J
4 1
GeorgiaPower n
. ENCLOSURE 1 (Continued) 1 SPECIAL REPORT 87-001 1
I.
overspeed -due to a lack -of response' from the mechanical governor.
The mech'anical -governor-was ' replaced.under~ MHO l
18709241, and the engine was started for setup of the new governor. Once the governor had been fully ' vented-and adjusted, the engine was. stopped and: started with the governor at its final-settings to verify proper engine response on startup.
The engine was slightly overly responsive, and 4 a smallf adjustment was made before engine shutdown.
The engine was again started to veri fy acceptable response: on startup.
The ; engine. and-generator reached. 60 HZ and. 4160 volts within the required Technical. Specification criteria.
The-generator was 'then-I paralle!ad.to the' power grid to verify governor response while-d
~
loaded.
Load was slowly increased.to: 7000 KH and.-allowed to remain at that load for approximately 15' minutes.. The ' control room operator turned away from the panel for a period of time, I
and when he subsequently checked generator loading, he lfound it was approximately 8000 KH and increasing.
The operator.
l attempted to decrease load, but it was found necessary to~ trip.
3 l
the engine.because the governor did not properly respond..The i
system engineer had observed no problem with governor' operation during this loaded run.
However, he' felt the governor might still be too responsive to changes in the power grid.
.This condition would require more attention froin-the operator to maintain desired load level.
The electric needle valve onL the mechanical. governor was adjusted - to-reduce responsiveness 'of 'the.
governor to power grid changes.-
The surveillance was then repeated with no observed problems.
LC0 1-87-0703, which was initiated on the first overspeed.. was cleared after 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> and 44 minutes.
The current surveillance test interval remains at once per 31 1
days in accordance with Technical Specification Table 4.8-1
" Diesel Generator Test Schedule".
l l
0520m El-2 9/23/87 SL-3247 foons-