ML17252A226

Dresden Unit 3, Letter Submitting Reportable Occurrence Number 050-249/1976-17 In Accordance With Technical Specifications, Section 6.6.B

ML17252A226
Person / Time
Site:	Dresden
Issue date:	09/30/1976
From:	Stephenson B B Commonwealth Edison Co
To:	Keppler J G NRC/RGN-III
References
BBS Ltr. #76-750
Download: ML17252A226 (3)

See also: IR 05000249/2019076

Text

. ' .. : . .. ,fommori'4th Edison . . :;;.cOresden Nuclear .Power Station. N*R.R.0#1 . ' .* Morris, Illinois 60450 Telephone 815/942-2920 *.*.* BBS Ltr. '#76-702 September 30, 1976* 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 50-249/1976-17. *This report is being'submitted to your office in. accordance with the Dresden .Nuclear Power Station Technical Section 6.6.B. BBS:jo ens on Superintendent. Dres"den Nuclear Power Station * cc:. Director of Inspection & .Enforcement Director of Management Information & Prog_ram Control . File/NRC . .*.; . REGULATORY.DOCKET FILE COPV '

.-_ . t ---_ LICENSEE EVENT REPORT -. * : . ' 1.,. I I I J. . . . 'LEASE PRINT ALL REQUIRED INFORMATION) 'I>* _ , UcENSEE . < --LICENSE EVENT -NAME ' __ '_LICENSE NUMBER* TYPE -TYPE--@E] IIILl.Pl'RISl3 I IJ/*11It11111 101 f I --7 -8 9 -: -,;; *14 15 --.,, -'25 ---26_ --.. 30 .31 -32 REPORT REPORT CATEGORY TYPE -SOURCE DOCKET NUMBER -:@E]coN'T I I I tCJ lbJ -EVENT DATE -REPORT DATE Io I c:t I / I '6 17 I C I _ I 0 I q 131 o 17 I lz.J 69 _--74 75::-;---80 . 1 -_0 57 58 59<< .. --60 61 68 ___ EVENT DESCRIPTiON 10'21.I AT 1'1l.5 -110URS ON t:tjt'lj7b11)E-IN£RTrNG-OF" THE:"DR'IWEU-WAS-BEGUN IN I 7 8 9 -----------80 10'31 I AA/TtCIPffflOJV OF THE SCH£DULE:D IJNIT SHUTDOWN FOR 1<EFU£).JNG-. AC -I 7 -_ *-0 "9 -* . -* --_ 00 -lo141 TO SEC-T10N 3.7. A. 5. 'B OF" Tl-4£ T£CHNIGAL. .S-PEC1F1c.11.rro/IJS ])Ry-I 7 8 9 -_ _ -_ _, BO ____ . lol51 !WELL '])£*JN£"R::rtNG-fVIAY CfJ'i>1M£NG£ J.,4 HOURS PRIOR. TO A SHUTl>OWN. I *_ -7 8 *9 ---------80 I Tf-lc. 'D1<.'IW£LL 0'1.VGEN. C:O.iVC.£NTRATION E)(CEEDED .I./ Ofo AT APPROX.I MATELV f 7 -8 9 > -* * --PRIME mt!Vni:f) .SHe::r)SD -SYSTEM CAUSE COMPONENT COMPONENT --. CODE . CODE COMPONENT CODE . SUFPUEtl -MANUFACTUF\ER --VIOlATXlN -[§0 ISIAI LE.J IZ.IZlZIZIZIZI -l£j IZt91'1.dqJ _ lYJ -. -7 8 9 *10 ---11 12 -17 -43 44 47 : -48 -_ -DESCRiP,Tl0N _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ 1w ORDER io sltirsFy fYJ1N1muWJ, SY.sritM J...iYAD 'R.£QUtR£r1rc-N{S. I.-1 8 9 ----------__ --'-.*. -. -------. -y --80 --. lol9Ll'w1ts *wor-*** SHUT' TJOWJJ WITHIN HOUR'-To J)RYWEl .. L J: -. 7 . 8 9 --------.* --80 --.. .. .. ... J -.> .. . .-,Q .. 9. *: -. . -. -<METH*O--D-OF-----(Sef; A-rtAC.!t£D*SHcutf) BO_* -. --*-**** -.. -* -.-. FACILITY ----" *. -.. -._ STATUS "' POWER OTHER STATUS 'DISCOVER';: --DISCOVERY DESCRIPT:ON [ill] (QJ Io 17 I 3 I I Nit I lAJ -1.._ __ _._M ......... fl...__. __ -_ 1 e s 10 12 13 44 45* 46 -FORM-OF ACTIVITY --cmlTENT --_ _ 11:l:l -OF _ _AMOUNT ,, .. , 1 ___ 1 -NALOCATION OF RELEASE 1 1 --a * --** 10 1-1 --44 --*** .......... __ __,_.;.,,.--___ ---'00 * 80 .' . *-:* . . PERSONNEL.E)(POSURES * -* --NUMBER -TYPE 0El3CRIP.TION . (!21 :j'OlD.10 I .. .'l6J I NA -..... -I . .. . _ 1 _ e s 11 12 13 80 -. PERS.ONNEL INJURIES NUMBER DESCRIPTION ff8 IOI OIOll _-___ M_'A __ __ ____, _________ __,I 1 e s 11 12 00 *_,...... .. .. ": _ OFFSJTE CONSEQUENCES Elfil -Al 11 -. 7 -89 80 -LOSS 'O_R DAMAGE TO FACILITY * TYPE * DESCRIPTION Efil *IZ.J -. NI/ 1 0* s -10 -80 .PUBLiciTY . ,-_ -./-(ill] NA 7 8 9 80 ADDITIONAL FACTORS

.. . .. . * .. ' EVENT DESCRIPT!ON (Continued) 2030 At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on 9-19-76, the unit load drop was halted at the direction of the Chicago load dispatcher because of a system emergency. . .* Dr)'Weil. inerting *was begun at 0415 hours0.0048 days <br />0.115 hours <br />6.861772e-4 weeks <br />1.579075e-4 months <br />; *by 0600 ,-the dr-iwell oxygen con-* * centrad.on had d:ropped below 4%. A similar event occurred on Unit-2 in .J:une, 1975. (50-249/1976-17) CAUSE DESCRIPTION (Continued) the unit.had been actually shut down, since the drywell oxygen concentration exceeded 4% less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. As stated above, an acceptable drywell oxygen concentration was achieved by 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on 9-19-76. No further action was considered appropriate. *-* .* ** *:< b* ..