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Each row (down) of subplots corresponds to five-fold greater resolution in time. 46 Fig. 24. Conventional statistical measures of tri-axial acceleration. The subplots are as follows: (top row) minimum (An), absolute average deviation (a), sample standard deviation (σ), and maximum (Ax); (second row from top) skewness (-) and kurtosis (- -); (third row from top) number of time steps per cycle; (bottom row) first zero (in time steps) in the autocorrelation function. 47 Fig. 25. Tri-axial accelerometer power vs time.

Linear measures for the air-gap seeded-fault. Top plot shows various linear measures of instantaneous power, P: minimum (Pn) as the bottom curve, maximum (Px) as the top curve, average plus one standard deviation (P + σP) as the middle top curve, and average minus one standard deviation (P - σP) as the middle bottom curve. Second plot down shows skewness (solid) and kurtosis (- -) in the instantaneous power. Third plot down shows the number of time steps per cycle in the instantaneous power. Bottom plot shows the lag in time steps, corresponding to the first zero in the autocorrelation function.

Tallett, who confirmed receipt of this information in an October 9, 2002 e-mail. On March 28, 2002, Lee Hively was contacted by Richard Wood (in ORNL’s Nuclear Science and Technology Division), who is a collaborator on a different NERI project. Wood requested a short (two paragraph) summary of our work for the Nuclear Regulatory Commissioners, which we provided that same day. 3 ISSUES/CONCERNS Lee Hively’s PII-400MHz PC failed late in the afternoon of Friday, July 12, 2002, and was diagnosed on Monday, July 15, 2000 with a harddrive crash.

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Ann Rpt - Forewarn of Failure - Critical Equip at Next-Gen Nuclear Powerplants


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