PROCESSES OF ERROR DETECTION IN THE PATTERN OF CORE LOADING, COMMUTATION OF NITC AND MISALIGNMENT IN CONTROL ROD POSITION IN VVER-TOI REACTOR USING THE THEORY OF PATTERN RECOGNITION
24th Symposium of AER on VVER Reactor Physics and Reactor Safety (2014, Sochi, Russia)
Core surveillance and monitoring
Abstract
PROCESSES OF ERROR DETECTION IN THE PATTERN OF CORE LOADING, COMMUTATION OF NITC AND MISALIGNMENT IN CONTROL ROD POSITION IN VVER-TOI REACTOR USING THE THEORY OF PATTERN RECOGNITION
Pinegin A.A., Ryzhov A.A.
NRC “Kurchatov Institute” Moscow, Russia
ABSTRACT
The presence of the extensive ICIS allows to detect violations in the reactor operation caused by improper loading of the core, misalignment in position of CR CPS working group, errors in commutation of KNI. Anomalies in the power distribution caused by the above reasons have some specific features. It allows to develop the problem-oriented procedure to identify these anomalies. These procedures can not be based on the recovered from ICIS data power distribution, because in considered cases procedures of power recovery are incorrect. As input information these procedures use indications of DCD.
The proposed algorithms are based on the estimation of linear functionals’ values using indications of DCD. Some parameters of the functionals (pattern of the functional) are determined by simulation of physical processes in the core. Another part of the functional parameters is determined by the methods of pattern recognition by minimizing losses due to errors in the recognition of the situation (Bayesian decision rule).
When determining the error in loading of the core Bayesian decision rules are calculated for each cell of the core within the measurement uncertainties, possible technological and computational errors.
When identifying a position of CR CPS as feature spaces it consider asymmetry in the power distribution in separate high-altitude layers of FA groups containing KNI and located near the considered CR CPS.
The report includes examples of numeric procedures that developed for detecting errors in loading the core and identifying positions of CR CPS.