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)

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 -. * : .

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-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

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.. .. ": _ OFFSJTE CONSEQUENCES

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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* ..