05000249/LER-1981-040, Forwards LER 81-040/01T-0

Forwards LER 81-040/01T-0

ML20027C802
Person / Time
Site:	Dresden
Issue date:	12/15/1981
From:	Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027C803	List: 05000249/LER-1981-040, Forwards LER 81-040/01T-0 05000249/LER-1981-040-01, /01T-0:on 811201,when Rx Pressure Decreased to 32 Psig,Rod N-9 Notched from Position 02 to 04 & Then to Position 06.Cause Unknown.Work Request Issued to Check Single Notch Control Switch During Next Refueling Outage
References
DJS-81-990, NUDOCS 8210270251
Download: ML20027C802 (1)

LER-1981-040, Forwards LER 81-040/01T-0

Event date:
Report date:
2491981040R00 - NRC Website

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1 James G. Keppler, Regional Dire.ctor Directorats of Regulatory Opera. ions - Region III J

U.S. Nuclear Regt.latory Cc:rnissien 799 Roosevelt Road L

Glen Ellyn, IL 60137 Reportable Occurrence Repert #81-40/0lT-0, Jocket #050-249 is being j

subuitted to ycur of fice in accordance witn Dresden Nuclear Pcwer Station Tee.hnical Specification 6.6.3.1.(d), reactivity anomalies, involving j

disagreenent with the predicted value of reactivity balance under steady state conditions during power operation, greater than or equal to 1%*k/k; a calculated reactivity balance indicating a shutdevn margin less P

conservative than specified in the techniccl specifications; short-term reactivity increases that correspond to a reactor period of less than 5

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seconds or, if sub-critical, an unplanned reactivity insertion of taore than 0.5%2.k/k or occurrence of any unplanned criticality.

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