### Abstract

Boiling water reactors (BWRs) represent a large fraction of the world's installed nuclear power capacity. The core model of a BWR is very complex because it has many fuel assemblies and strong axial heterogeneities such as coolant voiding, partial control rod insertion, and non-uniform fuel assembly design. In order to operate a BWR safely, it is necessary to supervise the performance of the reactor core during the operation cycle. Therefore, the operation of the reactor core in a BWR is supervised using a 3-dimensional on-line simulator. In order to raise the calculation accuracy of this 3-dimensional simulator, the calculation power distribution is corrected using the neutron flux distribution obtained by the in-core instrumentation. In this paper, a model that uses a neural network was developed in order to raise the calculation accuracy of this 3-dimensional simulator further. In order to apply a neural network to the complicated reactor core of a BWR, the learning algorithm needs to be improved. Therefore, a technique using the Quasi-Newton method for renewal of the connection weights of the Back-Propagation (BP) method was developed. Using this algorithm, the convergent ability of neural network learning was improved in the strongly nonlinear problems. When this algorithm was applied to a BWR, the calculation accuracy of a 3-dimensional simulator was improved considerably.

Original language | English |
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Title of host publication | ISIE 2002 - Proceedings of the 2002 IEEE International Symposium on Industrial Electronics |

Publisher | Institute of Electrical and Electronics Engineers Inc. |

Pages | 294-298 |

Number of pages | 5 |

ISBN (Print) | 0780373693, 9780780373693 |

Publication status | Published - 2002 Jan 1 |

Event | 2002 IEEE International Symposium on Industrial Electronics, ISIE 2002 - L'Aquila, Italy Duration: 2002 Jul 8 → 2002 Jul 11 |

### Publication series

Name | IEEE International Symposium on Industrial Electronics |
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Volume | 1 |

### Other

Other | 2002 IEEE International Symposium on Industrial Electronics, ISIE 2002 |
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Country | Italy |

City | L'Aquila |

Period | 02/7/8 → 02/7/11 |

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Control and Systems Engineering

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## Cite this

*ISIE 2002 - Proceedings of the 2002 IEEE International Symposium on Industrial Electronics*(pp. 294-298). [1026081] (IEEE International Symposium on Industrial Electronics; Vol. 1). Institute of Electrical and Electronics Engineers Inc..