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-Region III U. S. Nuclear Regulatory Commission 799 :Roosevelt Road Glen Ellyn, Illinois 60137 | ., | ||
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:== | ==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 | ||
LICENSEE NAME @E] | lol51 !VOLTAGE .BE.Gr-,f'J 7 .* 8 g* . | ||
I I/ | osc1 L/..:..AT/NG-, AND THE AC AND De CURRENT f'l'lCTE Rs 80 I | ||
7 ' B 57 58 59 60 . 61 68 69 74 75 80 EVENT DESCRIPTION | [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 , | ||
@Ifil I UPON CoMP}..E.TtDN OF RoUT1N£ UN1 T ').._h Dr GEN£RA-fop___ | COOE CODE COMPONENT CCJOE SUPPUEn MANUFACTURER VIOLATION 7 | ||
SuRycr L.IJCINcf: | @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 | ||
I* 7 8 9 . . . 80 f @faLJTEST1NG:, TH£ CONTROL.. | : 7. 8 9 . . . . . 80 lolsl !"i?f:CTIFIER. IN 1H£ GENER.ATOR. 1-1£&.D CIRCUIT, THE SHORT WflS. APPM~.ENT/.._y* | ||
S0v1TcH 'P).._P,CC:::D IN TH:G".STOP'' | * 1 7 0* g . . so | ||
pos1T10N. . f 7 B 9 80 | *'<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 :, | ||
THE G-EIVE"RATOR-I | * 1 | ||
TH£ DIESEi-G-ENE.RAToR. | *,* 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 | ||
WAS 1wir1£DfAT£J,,Y I 7 8 9 PR:ME (St:E' .'\ITAOISD Si-IEE.T) . 80 SYSTEM CAUSE COMPONENT COMPONENT , COOE CODE COMPONENT CCJOE SUPPUEn MANUFACTURER VIOLATION | ~J l-Gl*9 10 . | ||
@01£1£1 l[J 1£1.NIGlllNIEI lAJ | I~ 12I 13 NA 44 U3J 45 J\11-l 4-6-----------:------'80 I | ||
Mf!J...FUNcn oN RESUt..IED | FORM OF . | ||
[Rom A SHORTED SEJ....ENIVM | ACTIVITY | ||
: 7. 8 9 . . . . . 80 lolsl !"i?f:CTIFIER. | |||
IN 1H£ GENER.ATOR. | |||
1-1£&.D CIRCUIT, THE SHORT WflS. | |||
* 1 7 0* g . . so | |||
:, | |||
* 1 *,* 7* 8 9 FACILITY . . . . ... ... **. *... . . (S£it STATUS % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EID l-Gl*9 I NA U3J J\11-l | |||
* CONTENT RELEASED | * CONTENT RELEASED | ||
* OF RELEASE AMOUNT OF ACTIVITY E.EI lZJ l.Zl IL--_ ___;._Ni..,;,_1- | * 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 | |||
* EEllOIOIDI 7 . B 9 11 12 80 OFFSITE CONSEQUENCES }v/1 , .. 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE . DESCRIPTION | ~ jdlOIOI lKJ NA 7 9,9 11 12 . 13 80 | ||
., . | |||
PERSONNEL -INJURIES NUMBER DESCRIPTION | |||
,)J EVENT DESCRIPTION (Continued) to be operable, as were the Unit-2 LPCI, core spray, and CCSW systems.. | * EEllOIOIDI ,___-~N_A~*~~~~~~~~~~~~~~~~~~~.,.--~ | ||
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, CA.USE DESPCRIPTION (Continued) | 7 . B 9 11 12 80 OFFSITE CONSEQUENCES | ||
The rectifier failure evidently resulted in damage to, a* | ~ }v/1 , .. | ||
unit. in the circuit. Both were replaced, and the Unit 2/3'' tliesei genera'tor successfully tested and returned to service. Modification requests. | 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE . DESCRIPTION 7~J a glZ.J 1~0_,_;..;_ NA_______ -'-------~-------------"-'-----'----------;:'::'.00 PUBLICITY 7 | ||
have been initiated. | Em B 9 | ||
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 a §atisfactdry long-terin corrective action. | /\/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. | |||
* The rectifiers are model 300U80 selenium components manufactured by International Rectifier.}} | * The rectifiers are model 300U80 selenium components manufactured by International Rectifier.}} |
Revision as of 20:07, 29 October 2019
ML17252B482 | |
Person / Time | |
---|---|
Site: | Dresden |
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) | |
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.
- The rectifiers are model 300U80 selenium components manufactured by International Rectifier.