IR 05000249/2019077
| ML17252A293 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/21/1977 |
| From: | Stephenson B B Commonwealth Edison Co |
| To: | Keppler J G NRC/RGN-III |
| References | |
| BBS Ltr. #77-542 50-249/1977-16 | |
| Download: ML17252A293 (3) | |
Text
Common9ilth Edison --
Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS 1 Ltr. //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 Enclosed ,please find Reportable Occurrence report number 50-249/1977-1 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
& 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 ....
_t_h,...e_AP
__
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... n ... * n":"u""'n.;..c;;..i.;..*
a;,..;>J:_e_d;...* . ..,;.*_.,.,.c_h.:.._
__ * I* 7 8 9 . 10'31 r 7) indicated 75% flow*: and channel-;.
B (RBM**8) _;Jndic.ci,tei'd 69% f l()W exceeding'
t:he 0 1 .fo14j:s misinafch Channe was "rem9v'e4 frorri and cI:i.ii:nnel B remaine '* 7* ..*. 9,9. lolpl I operabl : .... *** . 60 Since chaimei *A took. a 12 scram:; the action taken was and the .* I *.I 7 B 9 ja*lsf '* eyent was of little. safety Thi's *occurrence::
has hap.pened 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: ..
.. 44,** *' .** * *47 *: 48"'* CAUSE DESCRIPTION . . * . .:: i.. ** .. -. . . . ' ' . . . . . . . : -' \ . . ; :
Chahne1 A flow ecinyerter high,:
of a
- ' (contini,ied)
- . * 7 8 9 (ojsj*I (GE catai6g nilmb.er an*µ;
bypassed inµned_ia.tgi *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 . ,
OESC:RIPTl.ON
.* lEJ Lo I 1I1 I NA t :. lLJ "I NA 9 10 ' . * 12 13 44 * .. .. ,.-=-..,;_...---.
____ 8-.l*O' FORM OF * " . . ACTIVITY . * CONTENT \ ** RELEASEO OF RELEASE ' . AMOUNT OF ACTIVITY LD.CATI .,OF *RELEASE ... _ rn* . ur w. '-*-* ______ _... I . . 1 NA , 1 * * 7 * 8 9 '.. 10 11 . -* 44 4'=5'""* ,....,.
.. -.-..
PERs'o:NNEL EXPOSURES
-> .. ' ,:;i. . ' :*:>-::+ ' ' .:: : : '* :-.*<* ... ... *,: * . * NUMBER'..
TYPE . *oeSCRIPTION
,,* _ .......
'.-"'.' ..
.. ** .. -. ];01 olol
_ ____;**-* . ____ - e s 11 )2 .. 13 * so .;* PERS*o.NNEL.'
- INJURIES . *-. -* ... , . ' NUMBER . OESCRIPTION
,. -* . . . . * -[lli] .J 0 J 0., 0 I
__ ....___;___;_
_____ ...;.,....;...
_
_ _J, * 1 es 11 12 ,7 8 9 .-..... .*, BC . . . OFFSITE *CONSEQUENCES
-[ill). * .. NA . I . . * 7.' 8 *9::-. --=--'"'."'.""-=---'---------------........-;.-..-...-.,.,.-.
,'"" ... --...
.,.....,_;.._;.....;.,...,,.,,_,...;..;.
......
LOSS OR OAMAGE JO . FACILITY.*
...... . ' TYPE
- .. 1, as . :OESCRIPTION
- . 10 NA .. (. ! .;:*-. 80 *****.* .. PUBUCiTY **:.*
.1 .
__________
__ _:. __________
...--:'-:60
- AOOrriONAL FACTORS .. *,.* ': .. '.. . ... . . . NA 7 '8 9 : . . f 80 * : *... *7f 1*'***'*:*9.'
B*.r._*.9::-
.. . *-* ".,.." __.,..__,..,.,..-_..;._....--,..-*
__;.,, -*
.... ' . . . .. _ ...
.. ' * '
- '..
- .. ",* .. . ** .. *.:NAME::
-* .. Larry* W. *
- .. PHONE! .....
.... 6 __ . ,t;JlA
'.* ". . '*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 . ! correctl Channel A was then put back in operatio The output of the faulty !'roportional Amplifier .had drifted 5% higher than normal. All internal components were f.ound to ,_be functioning properl The Proportional Amplifier was ibrated and te*sted satisfactoril 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.