Reactivity Estimation Based on an Extended State Observer of Neutron Kinetics

Reactivity is a key physical parameter that directly reflects the balance between neutron generation and consumption in every nuclear fission reactor. In this paper, by regarding the reactivity as an extended state-variable of point kinetics, a novel extended state-observer (ESO) is proposed. Theoretic analysis shows that this newly-built ESO provides globally asymptotically bounded estimation for the reactor neutron flux, concentrations of delayed neutron precursors and reactivity. Numerical simulation results illustrate the influence of the observer parameter to its performance, and show that this ESO can provide better reactivity estimation than the classical inverse point kinetics (IPK) method. The ESO has a simple form, and has only one parameter to be tuned online, which can induce an easy engineering implementation.

[1]  Kwang Y. Lee,et al.  LQG/LTR robust control of nuclear reactors with improved temperature performance , 1992 .

[2]  Wang Dazhong,et al.  Chinese nuclear heating test reactor and demonstration plant , 1992 .

[3]  N. Jahan,et al.  On Line Measurement of Reactivity Worth of TRIGA Mark-II Research Reactor Control Rods , 2011 .

[4]  János Végh,et al.  Implementation of new reactivity measurement system and new reactor noise analysis equipment in a VVER-440 nuclear power plant , 2009 .

[5]  W. Rooijen,et al.  Qualitative performance comparison of reactivity estimation between the extended Kalman filter technique and the inverse point kinetic method , 2014 .

[6]  Attila Rácz,et al.  On the estimation of a small reactivity change in critical reactors by Kalman filtering technique , 1992 .

[7]  Akhilanand Pati Tiwari,et al.  Estimation of sub-criticality using extended Kalman filtering technique , 2013 .

[8]  Jingqing Han,et al.  From PID to Active Disturbance Rejection Control , 2009, IEEE Trans. Ind. Electron..

[9]  A. Profio.  Experimental Reactor Physics , 1976 .

[10]  Reactivity calculation with reduction of the nuclear power fluctuations , 2009 .

[11]  T. Teichmann,et al.  Control of Nuclear Reactors and Power Plants , 1956 .

[12]  S. A. Ansari,et al.  Development of on-line reactivity meter for nuclear reactors , 1991 .

[13]  Y. Shimazu.  A simple procedure to estimate reactivity with good noise filtering characteristics , 2014 .

[14]  Qudrat Khan,et al.  Robust Parameter Estimation of Nonlinear Systems Using Sliding-Mode Differentiator Observer , 2011, IEEE Transactions on Industrial Electronics.

[15]  Jesús A. Rodríguez-Sarasty,et al.  Reactivity calculation using the Euler–Maclaurin formula , 2013 .

[16]  V. I. Utkin,et al.  Estimation of xenon concentration and reactivity in nuclear reactors using liding mode observers , 2001, Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228).

[17]  Hossein Khalafi,et al.  Design & construction of a digital real time reactivity meter for Tehran research reactor , 2011 .

[18]  A. I. Bhatti,et al.  Estimation of Reactivity and Average Fuel Temperature of a Pressurized Water Reactor Using Sliding Mode Differentiator Observer , 2013, IEEE Transactions on Nuclear Science.

[19]  Xue Wenchao,et al.  ACTIVE DISTURBANCE REJECTION CONTROL:METHODOLOGY AND THEORETICAL ANALYSIS , 2011 .

[20]  F. Silva,et al.  Calculation of reactivity using a finite impulse response filter , 2008 .

[21]  N. Vosoughi,et al.  On-line reactivity calculation using Lagrange method , 2013 .

[22]  J. J. Cruz,et al.  Reactivity estimation during a reactivity-initiated accident using the extended Kalman filter , 2015 .

[23]  Wang Dazhong,et al.  Technical design features and safety analysis of the 200 MWt Nuclear Heating Reactor , 1993 .