Abstract
Reactor stability is an important topic in BWR plant design and operation. The objective of the present study is to establish a method for estimating the reactor stability in an operating BWR by measuring process noise signals, such as neutron flux or core flow rate. In the present study, several methods, based on autoregressive modeling, are presented and their reliability is quantitatively evaluated, using both simulated and real plant noise data. On the basis of these examinations, an on-line stability monitoring system was developed. Through field tests on the system over a year in an operating BWR, the validity of the system has been confirmed. Also, valuable data about reactor stability has been obtained.
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