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| issue date = 10/29/1976
| issue date = 10/29/1976
| title = LER 76-062-00 for Dresden, Units 2 and 3 Re Upon Completion of Routine Diesel Generator Surveillance Testing, Control Switch Was Placed in the Stop Position, Generator Output Subsequently Became Erratic, Generator Voltage Began Oscillating.
| title = LER 76-062-00 for Dresden, Units 2 and 3 Re Upon Completion of Routine Diesel Generator Surveillance Testing, Control Switch Was Placed in the Stop Position, Generator Output Subsequently Became Erratic, Generator Voltage Began Oscillating.
| author name = Stephenson B B
| author name = Stephenson B
| author affiliation = Commonwealth Edison Co
| author affiliation = Commonwealth Edison Co
| addressee name = Keppler J G
| addressee name = Keppler J
| addressee affiliation = NRC/RGN-III
| addressee affiliation = NRC/RGN-III
| docket = 05000237, 05000249
| docket = 05000237, 05000249
Line 15: Line 15:
| page count = 3
| page count = 3
}}
}}
=Text=
{{#Wiki_filter:..
Commonv.rah Edison Dresde.1 Nucle~ower Station
.....            R.R. # *,
Morris, Illinois 60450 Telepho;ie 815/942-2920 BBS Ltr. 1176-757                              October *29, 1976 Mr. James G.. Keppler, Regional Director Directorate of Reg'ulatory Operations - Region III U. S. Nuclear Regulatory Commission 799 :Roosevelt Road Glen Ellyn, Illinois 60137
==REFERENCES:==
Docket No. 50-237 Doc~et No. 50-249 Enclosed please find Reportable Occurrence report number 50-237/1976-62.
This report iS bein~ submitted to your off iCe in accordance with the Dresden Nuclear Po~er Station Technical Specifications, Section 6.6.B.
                                                                            . ; ,-:-, t1 -z2-
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                                                                            /J '.I J. /
                                                                                    ~ :.{~** t.i?t*
                                                                                                    /'
                                                                                                    -!)--
L-i('~ B. B. Stephenson fr    Station Superintendent Dresden Nuclear Power Station BBS:jo Enclosure cc:  Director of Inspection &.Enforcement Director of Management* information & Program Control
* File/NRC
-* ....... --* ';*-------*  ..                                                                                                                                            ... ~.... -*---**--*- .___.._.......__
LICENSEE EVENT                      REPDF9 CONrROL Bl:OCK: .....
                                                              . **itI __._I__.____..l.__..*l~_,I I                                                                                                  (PLf:.ASE PRINT ALL REQUIRED INFORMATION]
1                              6 LICENSEE                                                                                                    LICENSE                    EVENT NAME                                              ucrnsr  NUMBER                                            TYPE                    TYPE
                  @E]    IIILIDIRISl~I                              10101-10101019101-10101 l-4ltlilllfl 10131 7    8 9                                  14      15                                                          25      26                      30      31      32 REPORT    RE PC RT CATEGORY            TYPE. SOURCE                      DOCKl;T NU.MOER                                EVENT DATE                            REPORT DATE
                '@E]coNT        I I. I lbJ                    U::J        Io I s I o L- Io I2 I 3 17J 101q 13lo17ll. I I/                                                IOl;Ll~l?l&.1 7 ' B          57        58        59          60 . 61                                              68      69                            74      75                              80 EVENT DESCRIPTION
                @Ifil I UPON CoMP}..E.TtDN                            OF RoUT1N£                    UN1 T        ').._h    Dr ~S£k GEN£RA-fop___ SuRycr L.IJCINcf: I*
7    8 9 .                                                                                                                                                    .                    . 80 f
                @faLJTEST1NG:, TH£ CONTROL.. S0v1TcH                                                  WA~ 'P).._P,CC:::D IN                TH:G".STOP''              pos1T10N.                        .f 7    B 9                                                                                                                                                                                80 lo148 9I THC 6-ENERAToR 7                        .            .        .
OUT PU/ SVBSE. QUE:NTLY B~Cfim£                                        ERR.41/C.. THE G-EIVE"RATOR-80 I
lol51 !VOLTAGE .BE.Gr-,f'J 7 .* 8 g*                            .
osc1 L/..:..AT/NG-, AND THE AC AND De                                              CURRENT              f'l'lCTE Rs 80 I
[Q]B] I WC.NT OF"F.;.SCAL£. TH£ uN1T-~ DIESEi- G-ENE.RAToR. WAS                                                                            1wir1£DfAT£J,,Y vc=~1F1E_D                        I 7    8 9                                                                            PR:ME                                                  (St:E' .'\ITAOISD Si-IEE.T)            . 80 SYSTEM          CAUSE                                                  COMPONENT                COMPONENT ,
COOE            CODE                COMPONENT CCJOE                    SUPPUEn                MANUFACTURER                VIOLATION 7
                @01£1£1 l[J 8 9    10              11          12 1£1.NIGlllNIEI 17 lAJ 43              44 IWI01lll71 47 w 48 CAUSE DESCRIPTION lolel .f-:n-4£      1>1£$EJ_ Gi=.NERATOR..                        Mf!J...FUNcn oN RESUt..IED [Rom                                    A    SHORTED SEJ....ENIVM
: 7. 8 9          .                                      .                .                                  .                                                                      . 80 lolsl !"i?f:CTIFIER.                  IN 1H£ GENER.ATOR.                          1-1£&.D CIRCUIT, THE SHORT WflS.                                        APPM~.ENT/.._y*
* 1 7 0* g                                                                                                                                .              .                                  so
*'<1;:~'.'.'il!@l'.:'~rc:110~E'.i{:1.:ttv:,>A~/~RAV0Ae'(~Bt1+&#xa3;nUP'D'F:'pT:RT' :at:fwttAl:fHt:"pb~*,cs:8r-:&#xa5;//e***'Rtic:-hF-i'tE:R                                                                :,
* 1
          *,* 7* 8 9        FACILITY                            .              .            .        . ... ~ET:l~D ~;*        . . . **.    *...  .    .      (S&#xa3;it    f.JTAUlGi5"<;1~&#xa3;'t:_'/)80 STATUS                  % POWER                      OTHER STATUS              DISCOVERY                              DISCOVERY DESCRIPTION EID 7 B          9
                              ~J                l-Gl*9 10 .
I~ 12I    13 NA            44 U3J 45 J\11-l 4-6-----------:------'80 I
FORM OF .
ACTIVITY
* CONTENT RELEASED
* OF RELEASE                AMOUNT OF ACTIVITY                                                            LOCATION OF RELEASE E.EI        lZJ                l.Zl IL--_              ___;._Ni..,;,_1-1_ ____.
44 Nil 7    8      9                    10      11 PERSONNEL EXPOSURES NUMBER.            . TYPE        DESCRiPTION
                ~      jdlOIOI lKJ                                            NA 7    9,9                11      12 . 13                                                                                                                                          80 PERSONNEL -INJURIES NUMBER              DESCRIPTION
* EEllOIOIDI                      ,___-~N_A~*~~~~~~~~~~~~~~~~~~~.,.--~
7 . B 9                  11  12                                                                                                                                                      80 OFFSITE CONSEQUENCES
                ~                    }v/1 ,              ..
7    8 9                                                                                                                                                                              80 LOSS OR DAMAGE TO FACILITY TYPE . DESCRIPTION 7~J  a glZ.J    1~0_,_;..;_  NA_______                          -'-------~-------------"-'-----'----------;:'::'.00 PUBLICITY 7
Em  B 9
                                      /\/11 80 ADDITIONAL FACTORS E@                  M 7    B 9                                                                                                                                                                              80
,)J EVENT DESCRIPTION (Continued) to be operable, as were the Unit-2 LPCI, core spray, and CCSW systems.. Since*
the Vnit-3 diesel generator was out of service at the time, all fuel movements were suspended on Unit-3, which was in a refueling_outage, The diesel generator was manually shut down, This is not a repetitive occurrence, (50~237/1976-62}
CA.USE DESPCRIPTION (Continued)
The rectifier failure evidently resulted in damage to, a* s~milar unit. in the circuit. Both were replaced, and the Unit 2/3'' tliesei genera'tor ~a~ successfully tested and returned to service.
Modification requests. have been initiated. t.o replace the rect_ifiers on all three diesel generators with physically large'!- unfrs that have higher voltage ratings. Installation of these higher capacity units will provid~ a &sect;atisfactdry long-terin corrective action.
* The rectifiers are model 300U80 selenium components manufactured by International Rectifier.}}

Latest revision as of 11:46, 4 February 2020

LER 76-062-00 for Dresden, Units 2 and 3 Re Upon Completion of Routine Diesel Generator Surveillance Testing, Control Switch Was Placed in the Stop Position, Generator Output Subsequently Became Erratic, Generator Voltage Began Oscillating.
ML17252B482
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 10/29/1976
From: Stephenson B
Commonwealth Edison Co
To: James Keppler
NRC/RGN-III
References
BBS LTR 76-757 LER 76-062-00
Download: ML17252B482 (3)
v • d • e


Text

..

Commonv.rah Edison Dresde.1 Nucle~ower Station

..... R.R. # *,

Morris, Illinois 60450 Telepho;ie 815/942-2920 BBS Ltr. 1176-757 October *29, 1976 Mr. James G.. Keppler, Regional Director Directorate of Reg'ulatory Operations - Region III U. S. Nuclear Regulatory Commission 799 :Roosevelt Road Glen Ellyn, Illinois 60137

REFERENCES:

Docket No. 50-237 Doc~et No. 50-249 Enclosed please find Reportable Occurrence report number 50-237/1976-62.

This report iS bein~ submitted to your off iCe in accordance with the Dresden Nuclear Po~er Station Technical Specifications, Section 6.6.B.

. ; ,-:-, t1 -z2-

. (A.*-v*-l~_,?.._,-..._;c::r}/1

/J '.I J. /

~ :.{~** t.i?t*

/'

-!)--

L-i('~ B. B. Stephenson fr Station Superintendent Dresden Nuclear Power Station BBS:jo Enclosure cc: Director of Inspection &.Enforcement Director of Management* information & Program Control

  • File/NRC

-* ....... --* ';*-------* .. ... ~.... -*---**--*- .___.._.......__

LICENSEE EVENT REPDF9 CONrROL Bl:OCK: .....

. **itI __._I__.____..l.__..*l~_,I I (PLf:.ASE PRINT ALL REQUIRED INFORMATION]

1 6 LICENSEE LICENSE EVENT NAME ucrnsr NUMBER TYPE TYPE

@E] IIILIDIRISl~I 10101-10101019101-10101 l-4ltlilllfl 10131 7 8 9 14 15 25 26 30 31 32 REPORT RE PC RT CATEGORY TYPE. SOURCE DOCKl;T NU.MOER EVENT DATE REPORT DATE

'@E]coNT I I. I lbJ U::J Io I s I o L- Io I2 I 3 17J 101q 13lo17ll. I I/ IOl;Ll~l?l&.1 7 ' B 57 58 59 60 . 61 68 69 74 75 80 EVENT DESCRIPTION

@Ifil I UPON CoMP}..E.TtDN OF RoUT1N£ UN1 T ').._h Dr ~S£k GEN£RA-fop___ SuRycr L.IJCINcf: I*

7 8 9 . . . 80 f

@faLJTEST1NG:, TH£ CONTROL.. S0v1TcH WA~ 'P).._P,CC:::D IN TH:G".STOP pos1T10N. .f 7 B 9 80 lo148 9I THC 6-ENERAToR 7 . . .

OUT PU/ SVBSE. QUE:NTLY B~Cfim£ ERR.41/C.. THE G-EIVE"RATOR-80 I

lol51 !VOLTAGE .BE.Gr-,f'J 7 .* 8 g* .

osc1 L/..:..AT/NG-, AND THE AC AND De CURRENT f'l'lCTE Rs 80 I

[Q]B] I WC.NT OF"F.;.SCAL£. TH£ uN1T-~ DIESEi- G-ENE.RAToR. WAS 1wir1£DfAT£J,,Y vc=~1F1E_D I 7 8 9 PR:ME (St:E' .'\ITAOISD Si-IEE.T) . 80 SYSTEM CAUSE COMPONENT COMPONENT ,

COOE CODE COMPONENT CCJOE SUPPUEn MANUFACTURER VIOLATION 7

@01£1£1 l[J 8 9 10 11 12 1£1.NIGlllNIEI 17 lAJ 43 44 IWI01lll71 47 w 48 CAUSE DESCRIPTION lolel .f-:n-4£ 1>1£$EJ_ Gi=.NERATOR.. Mf!J...FUNcn oN RESUt..IED [Rom A SHORTED SEJ....ENIVM

7. 8 9 . . . . . 80 lolsl !"i?f:CTIFIER. IN 1H£ GENER.ATOR. 1-1£&.D CIRCUIT, THE SHORT WflS. APPM~.ENT/.._y*
  • 1 7 0* g . . so
  • '<1;:~'.'.'il!@l'.:'~rc:110~E'.i{:1.:ttv:,>A~/~RAV0Ae'(~Bt1+£nUP'D'F:'pT:RT' :at:fwttAl:fHt:"pb~*,cs:8r-:¥//e***'Rtic:-hF-i'tE:R  :,
  • 1
  • ,* 7* 8 9 FACILITY . . . . ... ~ET:l~D ~;* . . . **. *... . . (S£it f.JTAUlGi5"<;1~£'t:_'/)80 STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EID 7 B 9

~J l-Gl*9 10 .

I~ 12I 13 NA 44 U3J 45 J\11-l 4-6-----------:------'80 I

FORM OF .

ACTIVITY

  • CONTENT RELEASED
  • OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE E.EI lZJ l.Zl IL--_ ___;._Ni..,;,_1-1_ ____.

44 Nil 7 8 9 10 11 PERSONNEL EXPOSURES NUMBER. . TYPE DESCRiPTION

~ jdlOIOI lKJ NA 7 9,9 11 12 . 13 80 PERSONNEL -INJURIES NUMBER DESCRIPTION

  • EEllOIOIDI ,___-~N_A~*~~~~~~~~~~~~~~~~~~~.,.--~

7 . B 9 11 12 80 OFFSITE CONSEQUENCES

~ }v/1 , ..

7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE . DESCRIPTION 7~J a glZ.J 1~0_,_;..;_ NA_______ -'-------~-------------"-'-----'----------;:'::'.00 PUBLICITY 7

Em B 9

/\/11 80 ADDITIONAL FACTORS E@ M 7 B 9 80

,)J EVENT DESCRIPTION (Continued) to be operable, as were the Unit-2 LPCI, core spray, and CCSW systems.. Since*

the Vnit-3 diesel generator was out of service at the time, all fuel movements were suspended on Unit-3, which was in a refueling_outage, The diesel generator was manually shut down, This is not a repetitive occurrence, (50~237/1976-62}

CA.USE DESPCRIPTION (Continued)

The rectifier failure evidently resulted in damage to, a* s~milar unit. in the circuit. Both were replaced, and the Unit 2/3 tliesei genera'tor ~a~ successfully tested and returned to service.

Modification requests. have been initiated. t.o replace the rect_ifiers on all three diesel generators with physically large'!- unfrs that have higher voltage ratings. Installation of these higher capacity units will provid~ a §atisfactdry long-terin corrective action.

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