On-line extraction of the variance caused by burn-up in in-core three-dimensional power distribution
| Autor: | Liu Wenfeng, Wang Yaqi, Luo Zhengpei, Li Fu |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Nuclear and High Energy Physics
Engineering Offset (computer science) business.industry Mechanical Engineering Pressurized water reactor Nuclear reactor law.invention Calibration coefficient Nuclear magnetic resonance Nuclear Energy and Engineering law Control theory Harmonics General Materials Science Safety Risk Reliability and Quality business Waste Management and Disposal Three dimensional model Burnup |
| Zdroj: | Nuclear Engineering and Design. 205:305-311 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/s0029-5493(00)00394-0 |
| Popis: | In most of PWRs, the ex-core ion-chambers are the sole real-time sensors to respond to in-core power and its axial offset. However, the calibration coefficient of the ion-chambers depends on the (3D) power distribution and varies with the burn-up. People expect to know the variance in distribution caused by burn-up directly from the signals of ion-chambers. This expectation is not realized as yet, because an ion-chamber almost only responds to its nearest fuel assemblies. The authors then developed a two-step method for burn-up characteristic extraction: the harmonics synthesis method and harmonics’ burn-up grouping. Using the extracted burn-up characteristics, the relationship between the readings of the ex-core ion-chambers and the in-core 3D power distribution is set up. Through the simulation on the heating reactor, the method of burn-up characteristic extraction is verified under engineering conditions. It is possible to on-line extract the variance caused by burn-up in 3D power distribution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect