Above-Extreme Extraction Mode in the Purex Process: 1. Calculation of the Pu and U Distribution in the Head Extractor

Radiochemistry - Tập 43 - Trang 562-568 - 2001
Yu. S. Fedorov1, B. Ya. Zilberman1, E. A. Puzikov1, E. N. Mishin1
1Khlopin Radium Institute, Research and Production Association, St. Petersburg, Russia

Tóm tắt

Accumulation of Pu(IV) in head extractors of the mixer-settler type as applied to two different flowsheets of NPP spent fuel reprocessing was simulated under dynamic and steady-state conditions using a mathematical model of extraction. Comparison of the calculations showed that the maximal accumulation of Pu in the head extractor is independent of the calculation procedure and is determined by the features of the extractor flowsheet. However, dangerous accumulation of Pu according to calculations for steady-state conditions (extreme mode of extraction) occurs at smaller deviations of the flow rates from the nominal values, as compared to calculations for the dynamic conditions (above-extreme extraction mode). Accumulation of Pu to high concentrations under steady-state conditions requires a longer time to attain the equilibrium, whereas under dynamic conditions Pu is accumulated considerably faster.

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Thông tin
Thông tin xuất bản

Radiochemistry

Tập 43

562-568

Thông tin tác giả