Numerical Consideration for Multiscale Statistical Process Control Method Applied to Nuclear Material Accountancy

Abstract

The multiscale statistical process control (MSSPC) method is applied to clarify the elements of material unaccounted for (MUF) in large scale reprocessing plants using numerical calculations. Continuous wavelet functions are used to decompose the process data, which simulate batch operation superimposed by various types of disturbance, and the disturbance components included in the data are divided into time and frequency spaces. The diagnosis of MSSPC is applied to distinguish abnormal events from the process data and shows how to detect abrupt and protracted diversions using principle component analysis. Quantitative performance of MSSPC for the time series data is shown with average run lengths given by Monte-Carlo simulation to compare to the non-detection probability . Recent discussion about bias corrections in material balances is introduced and another approach is presented to evaluate MUF without assuming the measurement error model.

Study on Loss Detection Algorithms Using Tank Monitoring Data

“…Although the wavelet method is almost the same as in Ref. 14), the basic procedure of the wavelet decomposition is described. The Morlet wavelet basis function É 0 ðÞ consists of a plane wave modulated by a Gaussian as shown below, where !…”

Study on Loss Detection Algorithms Using Tank Monitoring Data

“…14), the basic procedure of the wavelet decomposition is described. The Morlet wavelet basis function É 0 ðÞ consists of a plane wave modulated by a Gaussian as shown below, where !…”

Application of Data Reconciliation and Gross Error Detection to Nuclear Material Accounting for Spent Fuel Reprocessing

“…More recently, the fault detection technique by the multiscale principal component analysis has been applied to the detection of the diversion of SNM and the systematic errors due to the measurement's biases. 4) The latter application is a natural extension of the fault detection studied extensively in chemical process engineering. [5][6][7] Application of other techniques related to chemical process engineering, therefore, can contribute to the improvement of the nuclear safeguards systems for largescale fuel reprocessing plants.…”