American Nuclear Society
Home

Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 67 / Number 1 / Pages 8-18

A Method for Rapid Detection of Unexpected Reactivity Insertion into a Nuclear Reactor

Hideki Kokame, Yoshikazu Nishikawa

Nuclear Science and Engineering / Volume 67 / Number 1 / Pages 8-18

July 1978

Format:

Price:$30.00
Member Price:$27.00
Member Savings:$3.00

The problem of rapid detection of an unexpected reactivity insertion into a nuclear reactor is studied assuming a stochastic point reactor model and noisy measurements of neutron density. The fundamental assumption is that the time dependence of the reactivity is given as in a ramp function with unknown coefficients. Thereupon, the present method applies a likelihood ratio test to the innovation sequence obtained by using a discrete Kalman filter, which is designed for the steady-state condition of reactor operation. By numerical experiment, the mean delay time for detection has been obtained under the condition that the mean time between false alarms takes on a prescribed constant. A comparative study with some typical existing methods shows that the proposed method is remarkably effective except for extremely large or small inputs of reactivity.

 
 
 
Questions or comments about the site? Contact the ANS Webmaster.
advertisement