ML17252A272
| ML17252A272 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 04/20/1977 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| 50-249/1977-7 | |
| Download: ML17252A272 (3) | |
Text
Commonwec9 Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. # 333 April 20, Mr. James G. Keppler, Regional Directo~
Directorate of Regulatory Operation - Region I I I U. s: "Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, 111 inois 60137 REGULATORY DDCKEI RLE COPY Enclosed please find Reportable Occurrence rep~rt nu~ber 50-249/1977-7.
This report is being submitted to your office in accordance with the bresden Nuc 1 ec;ir Power Station Techn i ca,1 Specif i cat..i ons,. Section 6. 6. B..
BBS: skm
- Enclosure cc:
Director of Inspection & Enforcement Director of Management lnf~rmation & Program Control Fil e/NRC APR 2 5 1977
LICENSEE EVENT REPORT CONTROL BLOCK: Lj_**
1 L., I. I c&sE PRINT ALL,REQUIRED INFORMATION)
LICENSEE NAME
- @El I I I LI DI RI s I 31 1
0*s 14 REPORT CATEGORY TYPE.
6 LICENSE NUMBER 1°1°1~1°1°1°1°1°1-1°1°1 15 25 REPORT SOURCE DOCKET NUMBER LICENSE TYPE
~ 41 1 p 11 11 I
- 26.
3P EVENT DATE EVENT TYPE I o I 31 31 32 REPORT DATE
@E]coN'.T I I I LJ L':J I 01 51 01~10 12 14 19 I I o I 3 I 2 I.2 I 7 I 7 I 10141 21117171 7. 8
- 57.
58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION ffilfil. I During testing of the Unit-3 d)esel generator following maintenance, the engine 7
8 9 lol3r I started,.but*the generator field failed to flash.
The generator field flashed 7. 8 9 lol41'1 during a secon.d start-up of the diesel.
The diesel was started a third time, 7. 8**9 IPl51 J. and again the field did not flash.
The Unit-3 diesel generator was then shut 7
0*s lolsl I, down and dee 1 a red i noperab 1 e.
A subsequent attempt to start the Unit-2/3 diesel 1 *0 s
.SYSTEM CAUSE PRIME
~foont i nued)
- COMPONENT CoMPONENT CODE
. CODE COMPONENT CODE SUPPUER MANUFACTURER VDLATION
[§E] IE IE I* w I El NI GI II NI El
~
I WI 019 17 I
- l!U 7
8 9 10 11 12. :.*.*.
17 43 44 47 48 CAUSE DESCRIPTION.
~ I The failure was 'caused by an intermittent capacitor short in the generator field 7
8 9
~ll flashing circuitry.
The defective capaci_tor' was replaced, and the Unit-3 diesel 1*
0* 9 IT1§J I generator was satisfact_orily tested and returned to service.
7 8 9 FACIUTY STATUS Em L:J 7.; 8
.9 FORM OF ACTIVITY
'll. POWER I 01 913 10 CONTENT I
12 13 OTHER STATUS NA
{continued)
DISCOVERY DESCRIPTION I
80 I
80 I
80 I
80 I
80 k
80 l
eo I
80 80 rn RELEASED OF RELEASE AMOUNT OF ACTIVITY w
LlJ : I
. NA 11 LOCATION OF RELEASE
.__------'---------.....JI.,
80 7
8 9
10 PERSONNEL EXPOSURES NUMBER TYPE.
- DESCRIPTION II§] J 0 I 0 I 0 I.~
NA __________ _;. ___ _;.__;. ______
7 8 9 11*. 12 13 80 PERS'ONNEL INJURIES
. NUMBER
'DESCRIPTION l1E1 I 0 I 0 I 0 I ':--__
N_A ___________
.......:..---...~....-...__;..-__;..__;.._;. __
""'="
7 8 9*
11 12 80
- OFFSITE.. CONSEQUENCES
~.
NA 7
8 9 LOSS OR DAMAGE. TO FACILITY TYPE
[!El ~J DESCRIPTION NA 7
8 9 10 PUBLICITY NA ADDITIONAL FACTORS
- Elfil I NA
. 7 8 9 80 80 80
~.L-~~--------------------~--'-~--------~~
7 B. 9
&O J. B. Martin Ext. 265
~E:=....... ----------------------- PHONE:_.-... _ _.._ __
GPO 881*087
EVENT DESCR1PTION (continued)
-generator was-;:::unsuccessful (R. 0. report no.
50~237/1977-11).
This event was of little safety significance, since the redundant Unit-2/3 di ese 1.generator was demonstrated to be operab 1 e short 1 y thereafter (within
~5 minutes), and off-site power remained available durin~ this interval.
ihe
- Unit-2 diesel generator experienced a similar gen~rator field flashing failure in April, 1975.
(50-249/1977-7)
CAUSE DESCRIPTION (continued)
As a long-term corr~ctive action, the annu~l diesel generator maintenance procedure will be revised to include a check of the generator field flashing circ~it capacitors.
The failed capacitot is an 8-microfarad, 150-volt electrolytic unit manufactured by Aerovox:
- ~- *--
l : *4:
-* ~'....... :
, ~
-...,'J.,J
- 1