ML17252A293
| ML17252A293 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/21/1977 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| BBS Ltr. #77-542 50-249/1977-16 | |
| Download: ML17252A293 (3) | |
Text
Common9ilth Edison 0./~J Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS 1Ltr. //77-542 June zi] 1977 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
'..fi'IlL~
~
Enclosed,please find Reportable Occurrence report number 50-249/1977-16.
This report is being submitted to your office in accordance with the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B.
BBS:sm.
I Enc+osure cc:. Director of Insp~ction & Enforcement
_ B. B. Stephenson Station Superintendent Dresden Nuclear Power Station Director of Management Information & Program Control File/NRC 0
7,1* 940440 JUN 2 3 1977
CATEGORY f oJ HcoNTj: J I
- .. REPORT CA TE I o I 6 j 2 1 Gl7 I 1 !
- 7. *a 57 58 75,
. 80 EVENT ;oeSCRIPTION.
. * *.* Jo 12!.I,__...,.P-.:u_r_i_n... g_n....
o,.,.r,.,.m-:a_1__,o~p_e"'."'r""'."a_t_i_o_n.,;,',_* _t_h,...e_AP RM--._f_l.;..**o,.,.w~b~i-a_s;;..* _o".""f_f_-_n.;,..o_r..,;.*~_a_1_:.**_._a~* l.;..a.,;,r_,in;:...*... a~* n...
- n":"u""'n.;..c;;..i.;..* a;,..;>J:_e_d;...*...,;.*_.,.,.c_h.:.._ a_n~.n.;..e.;..l,...*_A_* __
- I*
7 8 9 10'31 r (RB~ 7) indicated 75% flow*: and channel-;. B (RBM**8) _;Jndic.ci,tei'd 69% f l()W exceeding' t:he 01
.fo14j:s misinafch crite~ia*~
Channel.A was "rem9v'e4 frorri ope~atiort and cI:i.ii:nnel B remained.
80
'* 7*..*. 9,9.
lolpl I operable.
60 Since chaimei *A took. a 12 scram:; the action taken was ~onservative and the I
- .I 7
B 9 ja*lsf '* eyent was of little. safety ~ignificanc~:. Thi's *occurrence:: has hap.pened iri.f~equen~1y 7
8 9
. PRME..
80 I
60
.. SYSTEM,-
. CAUSE
.-COMPONENT..
COMPONENT
. COOE
. COOE
.. COMPONENT' CODE<.'.
..SUPPUER
.. MANUFACT\\J!S Vl)t.ATl)N
[fil?] I*:+ :I '"l!J'., rl NjS IT!Rru.i-,
12::J.'..IGlcila loJ
- lliJ*..
- - 7,B 9 10 >
11
.*.12
- 17:
.. 43/~"-..:.. 44,**
- 47
- 48"'*
CAUSE DESCRIPTION
.:: i..
. : -' \\.. ;
- ~I.I Chahne1 A flow ecinyerter 'efigriai':,-w~s re~d;~~~ high,: be~au~e of a :_f'au:l~y*:.p_r~portioriai (contini,ied) *.
- 7 8 9 (ojsj*I ahipi~£ie.r_ (GE catai6g nilmb.er 50-?~~o?'ic:J\\A~l) an*µ; wa~: bypassed inµned_ia.tgiy. *The 80 I
80 proportional amplifier was r.epia'.C:ed.and the replacement was demonstrated to Operate I
7 8' 9
[@],.
FAClUTY METHOO: OF.
( continue<W *.
STATUS POWER OTHER STATUS,
..
- OISCOVERY.
, OISCOVE.~Y OESC:RIPTl.ON.*
lEJ Lo I 1I1 I NA t :. lLJ "I NA 9
10 '
- 12 13
.~ 44 *.. 4.5 4*'=5~. =-~---_...;...,;_,.,.*.;..
..,.-=-..,;_...---. ____
8-.l*O' FORM OF *
.. ACTIVITY.
- CONTENT
\\
- RELEASEO OF RELEASE '.
AMOUNT OF ACTIVITY LD.CATIO.N.,OF *RELEASE
... _ rn*. ur
- w. '-*-* ~NA
______ _... I..
1 NA
~*
1
- 7
- 8 9 '..
10 11 44 ~
4'=5'""*,....,. ~------:.--..;..*--.. -.-.. -------~----.;,...-8...JO PERs'o:NNEL EXPOSURES
~-;,:;i.
- >-::+ ' '
NUMBER'..
TYPE
. *oeSCRIPTION
,,* _....... r~
'.':,**~;.:-
\\'t-~:c.. **
. ~
];01 olol ~ *'~ -*~*~~*-**_***--*~._~-_ ____;**-* ~~~__;_~~__;_~~*. ____ -_. -~~~t.
1 e s 11
)2.. 13
- so PERS*o.NNEL.' *INJURIES NUMBER
. OESCRIPTION,.
-[lli].J 0 J 0., 0 I
~----N_A __
__;__.;,.._.,..;.,......-...;,.;...__:...;;,._;_,..;_~----_.;,.._.:...,;_;_ _ _J,
- 1 es 11 12
,7 8 9 BC.
OFFSITE *CONSEQUENCES
- [ill). *.. NA
. I 7.' 8 *9::-. --=--'"'."'.""-=---'---------------........-;.-..-...-.,.,.-.,'""... --... :~*--*.,.....,_;.._;.....;.,...,,.,,_,...;..;...........,.,..__._,,_~--.......:........:........._.....;,..;..;_,..,;___;.~....,8,.JO LOSS OR OAMAGE JO. FACILITY.*
TYPE
- ~J.LJ
- .. 1, as
. :OESCRIPTION *
. 10 NA
(.
80 PUBUCiTY
- ~.~,.NA
.1. 9!'9--.-...----:-~....,...---..,_.;...;......;.. __________
~-----~.....;........:...,..,.._;,...;.._.;._.;.._.;._.;._.,._.... __ _:. __________...--:'-:60 :
AOOrriONAL FACTORS
': ~.. '...
- ~
NA 7 '8 9
- ~-
. *~,.
f 80
- : *... *7f 1*'***'*:*9.' B*.r._*.9::-.. _:~:-'."""."~-:":"7'.~~"".'""::°"-:--~,.,..-~-:-:---:-~+":"'."'*
".,.." __.,..__,..,.,..-_..;._....--,..-* __;.,, -* -~~-----------'..,...;... ~E***.J
- .>~:*;::t:.7.":*":-..-
"/~,.
... _... *,*~(:*,"*.. ' * '
"*~. ;'..:.. ",*..
. **.. *.:NAME:: -*.. Larry* W.
- Ste~en~
PHONE!..... ~--E~x_t_._2_6.... 6 __
.,t;JlA ~Ml
".. '*i
........,~~...;:1.-r--='
' I EVENT DESCRIPTION (continued) before at mind.mum flow but cleared itself.
This condition has not occurred previously at other than minimlim flow.
(50-249/1977-16)
CAUSE DESCRIPTION (continued)
I correctly.
Channel A was then put back in operation.
The output of the faulty
!'roportional Amplifier.had drifted 5% higher than normal.
All internal components were f.ound to,_be functioning properly.
The Proportional Amplifier was recal-ibrated and te*sted satisfactorily.
APRM flows at this. time are checked daily per DOS* 500-4. *Any significant setpoint variations will be identified in a timely manner.
No further corrective action is deemed necessary.