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


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{{#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 Directo~
Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone  
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.
815/942-2920  
This report is being submitted to your office in accordance with the bresden Nuc 1ec;ir Power Station Techn i ca,1 Specif i cat..i ons,. Section 6. 6. B..
BBS Ltr. # 333 April 20, Mr. James G. Keppler, Regional  
BBS: skm
Directorate  
*Enclosure cc:   Director of Inspection & Enforcement Director of Management lnf~rmation & Program Control Fil e/NRC APR 2 5 1977
of Regulatory  
 
Operation  
LICENSEE EVENT REPORT CONTROL BLOCK:
-Region I I I U. s: "Nuclear Regulatory  
LICENSEE Lj_**
Commission  
1 L ., I . I 6
799 Roosevelt  
c&sE PRINT ALL,REQUIRED INFORMATION)
Road Glen Ellyn, 111 inois 60137 REGULATORY  
LICENSE              EVENT NAME                                       LICENSE NUMBER                    .        TYPE                TYPE
DDCKEI RLE COPY Enclosed please find Reportable  
  *@El I I             I LI DI RI           sI  31        1°1°1~1°1°1°1°1°1-1°1°1                          ~  41 1 p 11 11 I I o I 31 1     0*s                                   14         15                                        25      26.            .      3P    31    32 REPORT      REPORT CATEGORY           TYPE. SOURCE                 DOCKET NUMBER                     EVENT DATE                     REPORT DATE
Occurrence  
    @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 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                                                                   I lol 3 r I started,.but*the generator field failed to flash. The generator field flashed 7 8 9                                                                                                                                                      80 7 . 8 9 I
50-249/1977-7.  
80 lol41'1 during a secon.d start-up of the diesel. The diesel was started a third time,                                                                         I 7 . 8**9                                                                                                                                                   80 IPl51 J . and again the field did not flash. The Unit-3 diesel generator was then shut                                                                       I 7     0*s                                                                                                                                                 80 lolsl I ,         down and dee 1a red i noperab 1e.                         A subsequent attempt to start the Unit-2/3 diesel I
This report is being submitted  
1 *0       s                                                                       PRIME                                       ~foont i nued)
to your office in accordance  
* 80
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  
                .SYSTEM          CAUSE                                            COMPONENT       CoMPONENT
cc: Director of Inspection  
[§E] IE IE I*
& Enforcement  
7      8 9 10 CODE w
Director of Management  
                                . CODE 11 I El COMPONENT CODE NI GI 12 . : .* .*.
& Program Control Fil e/NRC APR 2 5 1977
II   NI El 17 SUPPUER
LICENSEE EVENT REPORT CONTROL BLOCK: Lj_** 1 L . , I . I c&sE PRINT ALL,REQUIRED  
                                                                                      ~
INFORMATION)  
43 I
LICENSEE NAME *@El I I I LI DI RI s I 31 1 0*s 14 REPORT CATEGORY TYPE. 6 LICENSE NUMBER
44 MANUFACTURER WI   019 17 I 47 VDLATION
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  
* l!U 48 CAUSE DESCRIPTION .                                                                                                     <
I I I LJ L':J I 01 51  
    ~          I     The failure was 'caused by an intermittent capacitor short in the generator field k
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  
7     8 9                                                     The defective capaci_tor' was replaced, and the Unit-3 diesel                               80
ffilfil. I During testing of the Unit-3 d)esel generator  
  ~ll                flashing circuitry.
following  
l IT1&sect;J0* 9I 1*
maintenance, the engine 7 8 9 lol 3 r I started,.but*the  
generator was satisfact_orily tested and returned to service.                                                                           eo I
generator  
7     8 9                                                                                                                                                 80 FACIUTY                                                                                                         {continued)
field failed to flash. The generator  
STATUS             'll. POWER                   OTHER STATUS                                     DISCOVERY DESCRIPTION Em8 7.;
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  
L:J              I 01 913 I                     NA
was then shut 7 0*s lolsl I , down and dee 1 a red i noperab 1 e. A subsequent  
                    .9                10                12    13                                                                                            80 FORM OF ACTIVITY        CONTENT AMOUNT OF ACTIVITY                                       LOCATION OF RELEASE rn w RELEASED        OF RELEASE 7      8          9 LlJ 10
attempt to start the Unit-2/3 diesel 1 *0 s .SYSTEM CAUSE PRIME  
:11I            . NA
i nued) * COMPONENT
                                                                                                .__------'---------.....JI                                     80 PERSONNEL EXPOSURES
CoMPONENT
      .             NUMBER           TYPE.
CODE . CODE COMPONENT  
* DESCRIPTION II&sect;] J 0 I 0 I 0I                  .~      . .____NA_ _ _ _ _ _ _ _ _ __;.____;.__;._ _ _ _ _ ___,
CODE SUPPUER MANUFACTURER
7       8 9             .     11* . 12       13                                                                                                           80 PERS'ONNEL INJURIES
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  
                  . NUMBER           'DESCRIPTION l1E1 I 0 I 0 I 0I ':--__N_A_ _ _ _ _ _ _ _ _ _ _.......:..---...~....-...__;..-__;..__;.._;._ _""'="
capacitor  
7     8 9*                   11   12                                                                                                                     80
short in the generator  
            ** OFFSITE .. CONSEQUENCES
field 7 8 9 flashing circuitry.
  ~.                  NA 7     8 9                                                                                                                                                 80 LOSS OR DAMAGE . TO FACILITY TYPE         DESCRIPTION
The defective  
[!El ~J                            NA 80 7     8 9               10 PUBLICITY NA ADDITIONAL FACTORS
capaci_tor'  
. 7
was replaced, and the Unit-3 diesel 1* 0* 9 IT1&sect;J I generator  
  *Elfil8 9I                NA 80
was satisfact_orily  
  ~.L-~~--------------------~--'-~--------~~
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)
7     B. 9                                                                                                                                               &O J. B. Martin                                                                 Ext. 265
DISCOVERY  
                              ~E:= .......- - - - - - - - - - - - - - - - - - - - - - - PHONE:_.-..._ _..__ __...;_
DESCRIPTION  
GPO 881*087
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  
EVENT DESCR1PTION (continued)
EXPOSURES . NUMBER TYPE. * DESCRIPTION  
  -generator was-;:::unsuccessful (R. 0. report no. 50~237/1977-11).
II&sect;] J 0 I 0 I 0 I .. .__ __ NA __________
This event was of little safety significance, since the redundant Unit-2/3 di ese 1 .generator was demonstrated to be operab 1e short 1y thereafter (within
_;. ___ _;.__;. ______ __, 7 8 9 . 11* . 12 13 80 PERS'ONNEL  
    ~5 minutes), and off-site power remained available durin~ this interval. ihe
INJURIES . NUMBER 'DESCRIPTION  
  - Unit-2 diesel generator experienced a similar gen~rator field flashing failure in April, 1975.
l1E1 I 0 I 0 I 0 I ':--__ N_A ___________
(50-249/1977-7)
__ ""'=" 7 8 9* 11 12 80 * * OFFSITE .. CONSEQUENCES NA 7 8 9 LOSS OR DAMAGE . TO FACILITY TYPE [!El DESCRIPTION
CAUSE DESCRIPTION (continued)
NA 7 8 9 10 PUBLICITY  
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:
NA ADDITIONAL  
                                                                                      ; ~-
FACTORS *Elfil I NA . 7 8 9 80 80 80
l :
7 B. 9 &O J. B. Martin Ext. 265  
                                                                                              *4:
....... -----------------------
                                                                                    -* ~'. ...... :
PHONE:_.-...  
                                                                                    ., , ~
_ _.._ __ _...;_ GPO 881*087
                                                                                    - ... ,'J.,J
-. * EVENT DESCR1PTION (continued) -generator  
::::1}}
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
}}

Latest revision as of 12:17, 4 February 2020

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 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 1ec;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:

LICENSEE Lj_**

1 L ., I . I 6

c&sE PRINT ALL,REQUIRED INFORMATION)

LICENSE EVENT NAME LICENSE NUMBER . TYPE TYPE

  • @El I I I LI DI RI sI 31 1°1°1~1°1°1°1°1°1-1°1°1 ~ 41 1 p 11 11 I I o I 31 1 0*s 14 15 25 26. . 3P 31 32 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NUMBER EVENT DATE 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 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 I lol 3 r I started,.but*the generator field failed to flash. The generator field flashed 7 8 9 80 7 . 8 9 I

80 lol41'1 during a secon.d start-up of the diesel. The diesel was started a third time, I 7 . 8**9 80 IPl51 J . and again the field did not flash. The Unit-3 diesel generator was then shut I 7 0*s 80 lolsl I , down and dee 1a red i noperab 1e. A subsequent attempt to start the Unit-2/3 diesel I

1 *0 s PRIME ~foont i nued)

  • 80

.SYSTEM CAUSE COMPONENT CoMPONENT

[§E] IE IE I*

7 8 9 10 CODE w

. CODE 11 I El COMPONENT CODE NI GI 12 . : .* .*.

II NI El 17 SUPPUER

~

43 I

44 MANUFACTURER WI 019 17 I 47 VDLATION

  • l!U 48 CAUSE DESCRIPTION . <

~ I The failure was 'caused by an intermittent capacitor short in the generator field k

7 8 9 The defective capaci_tor' was replaced, and the Unit-3 diesel 80

~ll flashing circuitry.

l IT1§J0* 9I 1*

generator was satisfact_orily tested and returned to service. eo I

7 8 9 80 FACIUTY {continued)

STATUS 'll. POWER OTHER STATUS DISCOVERY DESCRIPTION Em8 7.;

L:J I 01 913 I NA

.9 10 12 13 80 FORM OF ACTIVITY CONTENT AMOUNT OF ACTIVITY LOCATION OF RELEASE rn w RELEASED OF RELEASE 7 8 9 LlJ 10

11I . NA

.__------'---------.....JI 80 PERSONNEL EXPOSURES

. NUMBER TYPE.

  • DESCRIPTION II§] J 0 I 0 I 0I .~ . .____NA_ _ _ _ _ _ _ _ _ __;.____;.__;._ _ _ _ _ ___,

7 8 9 . 11* . 12 13 80 PERS'ONNEL INJURIES

. NUMBER 'DESCRIPTION l1E1 I 0 I 0 I 0I ':--__N_A_ _ _ _ _ _ _ _ _ _ _.......:..---...~....-...__;..-__;..__;.._;._ _""'="

7 8 9* 11 12 80

    • OFFSITE .. CONSEQUENCES

~. NA 7 8 9 80 LOSS OR DAMAGE . TO FACILITY TYPE DESCRIPTION

[!El ~J NA 80 7 8 9 10 PUBLICITY NA ADDITIONAL FACTORS

. 7

  • Elfil8 9I NA 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 1e short 1y 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
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