ML17252A269
| ML17252A269 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/02/1976 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| BBS Ltr. #76-845 50-249/1976-32 | |
| Download: ML17252A269 (3) | |
Text
e Commonweal9dison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #76-845 Mr. James G. Keppler, Regional Director
\\
December 2, 1976 Directorate of Regulatory Operations - Region III U. S. Nuclear Regulatory Co'mmission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Enclosed please find Reportable Occurr~nce report number This* report is being submitted to. your office in accordanc1 with* the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B.
BBS :jo
- Enclosure cc:
Director of Inspection & Enforcement eph son Station Superiritendent Dre~den Nuc!'ear Power Station l;lirector of Management Information & P*rogram Control File/NRC DEC 7 1976
CONTROL BLOCK: I 1
LICE~SEE EVENT REPORT -
I ! I *. I *. I I.. *
(PLEASE PRINT ALL REQUIREOINFORMATION)
LICENSEE NAME
@E] 1Ilt..IDIRISl31.
7 8 9
- 14.
6 LICENSE NUMBER 10101~10101016101-10101 15 25 LICENSE TYPE 1~111111111 26 30 CATEGORY REPORT TYPE.
REPORT SOURCE OOCKET NUMBER.
EVENT OATE EVENT TYPE 10131 31 32 REPORT DATE
@E1 cowr I I I lbJ L&J
!015101_.:._IOl;1..141ql I! It IOIS-171'1 1tI~1011171<01.
7 8
57 58 59 60 61 68
.68 74 75 80 EVENT DESCRIPTION IQI?J I WHILE TH£ UN!T-3 DIES.e.:L GEN£.RATOR WA$ BEING-OPERATED TO.PERFORM I 7
8 9 80 lo131 I 4 KV BRE:AKER SWITCH 1NCr, IT WAS FOUND TH11I THE £NGIN£" SPEED (t..oADJ I 7
8 8 80
@El lcouLP 13.£ j)ECR.£ASED BVT Nor 1Nc.Re:1tS£.D ERbpf TH£.c.D!IJTR.01-Room. FUJ...L I 7
8 9.
,~,
80
~
I.ENG-INC: SP££D. CONTROL WAS P.V!tlL././BJ..,f: AT THE J....QCAL CONTROL STfJTtotJ.. Auro-1 7
8 8 80/
[£ffil fYJ!f//C ST.
OF TH£
- oT 'AFFECTi.D
- 7.
8 9 PR:ME (5£G ATTAlt1CJ) S~£ET 80 SYSTEM CAUSE COMPONENT COMPONENT CODE COOE COMPONENT. COOE.
SUPPLIER
- MANUFACTURER VIOLATION
@0 IELE I l_fil 1£ IN I G 11 INIEI ll!.J llV I :l I~ IO I lM 7
8 9 10 11 12
- 17.
43 :
44 47 I 48 CAUSE DESCRIPTION lolsl I TUE FAILURE WAS Cl\\(;)$£D"--*ey"1k\\*:7nsG:8.i§iN1C:AL tr1AiFVN~T10/.i oF*'_*:.if.1£~':*RAtSE *I.
7 8 8 80
8 8 80 IT@ l]}.IE GOvERNoR.. sE:TT1N(;... ro A No~1-0Ao f::RiQ.itep.ic;v~ or!/~ -~~-fub. Hz
- FDJ..-Low1N& I T' 8 8
($6£ R7rl'C~D ~ltSCT) 80.
.. i=Ac1i:1ry
.. ~ETHOO OF
.. -.STATUS
% POWER OTHER STATUS DISCOVERY.
DISCOVERY DESCRIPTION EEJ lliJ IO I oj o I
- vA
@.j 7. 8
. 9 10
. 12.. 13.
44 45 46 AIA J
~----,--~----,-------*
80 FORM OF ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY rn. ~
- lZJ L.-1 _
____,.._.,_/0_~_-"--__.
7 8
. 8.
10 11 I,
- LOCATION OF.RELEASE
~-~~---"M~n~~~-*
~~~_.I 80 44 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION
~
.101C>I01 lZJ.___ __
M_'.4-_* ----------------~
7 9_9.
- 11-
- 12.
13-80 PERSONNEL INJURIES NUMBER.
DESCRIPTION EEi IO Io 10 I
"'----~M.;..;..lfl.::-.-____________________
7 8 9.
11 12 80
- OFFSITE CONSEQUENCES 12nl..
J\\I...
7 8 8.
80 LOSS OR DAMAGE TO FACILITY TYPE
!))]. lZJ DESCRIPTION I.
di/
7 8 9.
10 80 PUBLICITY
. -*Bil I -- N/I.
7 8 8 80 ADDITIONAL FACTORS
~
/I/If 7
8 8 80
~
7 8 9 80 NAME: TER.R.ANC£ £ ~
/_ANG-PHONE: £xr. 433 GPO 881 * ~67
_ EVENT DESCRIPTION (Continued) by this failure.
The lJnfr 2/3 diesel generator was immediately verified to be operable, as were the. Uni_t...:J. LPCI, core.spray, and *ccsw systems. (50-249/1976-32)
~
- CAUSE DESCRIPTION (Con.tinued).,
the shutdown o,~~-~he* diesel.
"The~'§_witch was apparently actuated when the diesel was last shut\\gowq:,: and,.remained open after. the subsequent start-.up of the diesel.
The failure of'the switch to close after start-up precluded remote speed control of the diesel in the manual mon~~
Th~-.;.--rais~ overtravel limit sJ.~Tuh. incorporates.a microswitch ~ith an attached r_,,,._...r.,-_.,_:~-~.P"'o-
._,~~
actw~~g~&r~1! The 11m1t switch was found out of adJustment, apparently due to.
vibration;allowing the limit switch to remain open after start:....up of the diesel.
The switch arm was *actuated manuall.Y to ensure free movement of the contacts, and the actuating arm *was reset slightly.. -
.To prevent recu!rence, a modificatic>n request has been subm_itted t:o remove the, raise overtravel limit switches from the Unit-2, Unit-3 and Unit 2/3 diesel governors.
Since no-load frequency.for the diesel generators can be regulated.from the control room, the removal of these switches will have no-adverse effect on diesel generat:or
- frequency control. ;. A similar failure occurred on the Unit-:-3 diesel generator in 1972.. The diesel governor _is a model uc..:.8 unit manufactured by the Woodward
.Go'vernor Company.