ML17252A226

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 Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #76-750
Download: ML17252A226 (3)

Text

. .,fommori'4th Edison .

.:;;.cOresden Nuclear .Power Station.

N*R.R. #1 0 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 Specifications~ Section 6.6.B.

ens on Superintendent.

Dres"den Nuclear Power Station BBS:jo

• .;.~Enclosure.

cc:. Director of Inspection &.Enforcement Director of Management Information & Prog_ram Control .

File/NRC

. ' .. ~ : .

.REGULATORY.DOCKET FILE COPV

t

-- -_ LICENSEE EVENT REPORT -

.*  :  :~)"'... CONTRO~'.:BLOC1<'\

. ' 1.,. I I I J. . .. 'LEASE PRINT ALL REQUIRED INFORMATION)

'I>* _ , UcENSEE . < -- LICENSE EVENT

- NAME ' __ '_LICENSE NUMBER* TYPE - TYPE- -

@E] IIILl.Pl'RISl3 I 15 10101~10101010101-10101 IJ/*11It11111 101 f I

-- 7 -8 9 -  : - ,;; *14 - - .,, - '25 -- - 26_ -- .. 30 .31 - 32 REPORT REPORT CATEGORY TYPE - SOURCE DOCKET NUMBER - EVENT DATE - REPORT DATE I I I tCJ IOl5l017IOl~l~f,I Io Ic:t I / I'6 17 I C74I _I75::-;-- 0 Iq 131 o -17 I lz.J 59<< . - lbJ

- :@E]coN'T 1 -_0 57 58 60 61 68 69 _-- 80 .

___ EVENT DESCRIPTiON 10'21.I AT 1'1l.5 -110URS ON t:tjt'lj7b 1 1)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 7 8 9 lc.o~DtNG- TO SEC-T10N 3.7. A. 5. 'B OF" Tl-4£ T£CHNIGAL. .S-PEC1F1c.11.rro/IJS ])Ry-

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____ . 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 (Sfi~ mt!Vni:f) .SHe::r)SD -

SYSTEM CAUSE COMPONENT COMPONENT

- . CODE . CODE COMPONENT CODE . SUFPUEtl - MANUFACTUF\ER - VIOlATXlN

- *~. [§0 ISIAI

-. - 7 8 9 *10 -- -

LE.J 11 IZ.IZlZIZIZIZI 12 - 17 -

-l£j 43 44 IZt91'1.dqJ _ lYJ 47 : - 48

-_ - ~ALISE DESCRiP,Tl0N _ _ _ _ _ _ __ _ __ _ _ _ _ _ _

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1 8 9 - - - -- - - - - -__ -- '-.*. - . - - - - - -. - y - - 80 -

. lol9Ll'w1ts *wor-*** SHUT' TJOWJJ WITHIN 14./-£:0..if,~ HOUR'- P.f1<10D-suBs-~Qui:NT To J)RYWEl..L J: -

. 7 . 8 9 - - -- - - - - .* - - 80 -

-.. /.[!:@*l*UE~.aNERTl.N.G-~ . SPtf"E'TY,.l.~Pl-ICA.TlotJS. ~,,WE;R£,.-}';J.04:::,ffiORE:E;$f.G:N;f:E:JGAN'T~::.m.:HAN.~~-JF:,... J-

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• - . . - . - <METH*O--D-OF- - - -- (Sef; A-rtAC.!t£D*SHcutf) BO_*

-" *. - .. - ._ STATUS "' POWER OTHER STATUS 'DISCOVER';: - - DISCOVERY DESCRIPT:ON

[ill] (QJ Io 17 I 3 I I Nit I lAJ -1.._ _ __._M. . .fl...__. . . __ -_ -~..----.....-11 1 e s

-FORM- OF 10 12 13 44 45* 46 80

.' . *-:* . . ACTIVITY -- cmlTENT - -

__ :l:l -Rilz.sr~-: OF izf-~Er* _ _AMOUNT °JJ~CTIVITY ,, . ,

1 __ 1 -NALOCATION OF RELEASE 1-1-----~._,...,.,,,;::,...._:- - 4 4 -- *** 4~5_..,......---.--...........,..-....,....,.... . . . . ____,_.;.,,.--___---'001

• 11 1 -- a * ,~ --** 10 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 es 11 12 . . ": 00

_OFFSJTE CONSEQUENCES Elfil -Al11 - 80 -

. 7 - 89 LOSS 'O_R DAMAGE TO FACILITY

• TYPE

• DESCRIPTION Efil *IZ.J -.10 -

1 0* s -

NI/

80

- ./-

.PUBLiciTY (ill] NA 7 8 9 80 ADDITIONAL FACTORS

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. * .. '  :~

EVENT DESCRIPT!ON (Continued) 2030 hour0.0235 days <br />0.564 hours <br />0.00336 weeks <br />7.72415e-4 months <br />s~ 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% for.~ 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.

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