ML17252A272: Difference between revisions

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See also: [[see also::IR 05000249/2019077]]


=Text=
=Text=
{{#Wiki_filter:Commonwec9  
{{#Wiki_filter: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 Directorate of Regulatory Operation  
Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone  
-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 50-249/1977-7.
815/942-2920  
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  
BBS Ltr. # 333 April 20, Mr. James G. Keppler, Regional  
& Enforcement Director of Management  
Directorate  
& 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)
of Regulatory  
LICENSEE NAME *@El I I I LI DI RI s I 31 1 0*s 14 REPORT CATEGORY TYPE. 6 LICENSE NUMBER 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 12 14 19 I I o I 3 I 2 I .2 I 7 I 7 I 10141 2 1117171 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 lol 3 r 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 i nued)
Operation  
* 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
-Region I I I U. s: "Nuclear Regulatory  
* 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 flashing circuitry.
Commission  
The defective capaci_tor' was replaced, and the Unit-3 diesel 1* 0* 9 IT1&sect;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)
799 Roosevelt  
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  
Road Glen Ellyn, 111 inois 60137 REGULATORY  
., 80 7 8 9 10 PERSONNEL EXPOSURES . NUMBER TYPE.
DDCKEI RLE COPY Enclosed please find Reportable  
* DESCRIPTION II&sect;] J 0 I 0 I 0 I .. .__ __ NA __________
Occurrence  
_;. ___ _;.__;. ______ __, 7 8 9 . 11* . 12 13 80 PERS'ONNEL INJURIES . NUMBER 'DESCRIPTION l1E1 I 0 I 0 I 0 I ':--__ N_A ___________
50-249/1977-7.  
__ ""'=" 7 8 9* 11 12 80 *
This report is being submitted  
* OFFSITE .. CONSEQUENCES NA 7 8 9 LOSS OR DAMAGE . TO FACILITY TYPE [!El DESCRIPTION NA 7 8 9 10 PUBLICITY NA ADDITIONAL FACTORS *Elfil I NA . 7 8 9 80 80 80 7 B. 9 &O J. B. Martin Ext. 265  
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  
& 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  
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  
12 14 19 I I o I 3 I 2 I .2 I 7 I 7 I 10141 2 1117171 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 lol 3 r 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  
i nued) * COMPONENT  
CoMPONENT  
CODE . CODE COMPONENT  
CODE SUPPUER MANUFACTURER  
VDLATION [&sect;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 flashing circuitry.  
The defective  
capaci_tor'  
was replaced, and the Unit-3 diesel 1* 0* 9 IT1&sect;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&sect;] 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 DESCRIPTION  
NA 7 8 9 10 PUBLICITY  
NA ADDITIONAL  
FACTORS *Elfil I NA . 7 8 9 80 80 80  
7 B. 9 &O J. B. Martin Ext. 265  
....... -----------------------
....... -----------------------
PHONE:_.-...  
PHONE:_.-...
_ _.._ __ _...;_ GPO 881*087   
_ _.._ __ _...;_ GPO 881*087   
-. * EVENT DESCR1PTION (continued) -generator  
-.
was-;:::unsuccessful (R. 0. report no.  
* EVENT DESCR1PTION (continued) -generator was-;:::unsuccessful (R. 0. report no.
This event was of little safety significance, since the redundant  
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 minutes), and off-site power remained available this interval.
Unit-2/3 di ese 1 .generator  
ihe -Unit-2 diesel generator experienced a similar field flashing failure in April, 1975. (50-249/1977-7)
was demonstrated  
CAUSE DESCRIPTION (continued)
to be operab 1 e short 1 y thereafter (within minutes), and off-site power remained available  
As a long-term action, the diesel generator maintenance procedure will be revised to include a check of the generator field flashing capacitors.
this interval.  
The failed capacitot is an 8-microfarad, 150-volt electrolytic unit manufactured by Aerovox: ; *--l : *4: -* ...... : ., ' ... , -. -... ,'J.,J ::::1}}
ihe -Unit-2 diesel generator  
experienced  
a similar  
field flashing failure in April, 1975. (50-249/1977-7)  
CAUSE DESCRIPTION (continued)  
As a long-term  
action, the  
diesel generator  
maintenance  
procedure  
will be revised to include a check of the generator  
field flashing  
capacitors.  
The failed capacitot  
is an 8-microfarad, 150-volt electrolytic  
unit manufactured  
by Aerovox: ; *--l : *4: -* ...... : ., ' ... , -. -... ,'J.,J ::::1
}}

Revision as of 15:03, 17 August 2019

Transmittal of Reportable Occurrence Report No. 50-249/1977-7
ML17252A272
Person / Time
Site: Dresden  Constellation icon.png
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)
v • d • e


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 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 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

& 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 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 12 14 19 I I o I 3 I 2 I .2 I 7 I 7 I 10141 2 1117171 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 lol 3 r 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 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 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 DESCRIPTION NA 7 8 9 10 PUBLICITY NA ADDITIONAL FACTORS *Elfil I NA . 7 8 9 80 80 80 7 B. 9 &O J. B. Martin Ext. 265

....... -----------------------

PHONE:_.-...

_ _.._ __ _...;_ GPO 881*087

-.

  • EVENT DESCR1PTION (continued) -generator was-;:::unsuccessful (R. 0. report no.

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 minutes), and off-site power remained available this interval.

ihe -Unit-2 diesel generator experienced a similar field flashing failure in April, 1975. (50-249/1977-7)

CAUSE DESCRIPTION (continued)

As a long-term action, the diesel generator maintenance procedure will be revised to include a check of the generator field flashing capacitors.

The failed capacitot is an 8-microfarad, 150-volt electrolytic unit manufactured by Aerovox: ; *--l : *4: -* ...... : ., ' ... , -. -... ,'J.,J ::::1

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