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Determination of neutron spectrum for nuclear reactor based on non-extensive statistical theory
Yonggang Zhangsun1, Zhiming Li1, Chunlei Su1
1National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an, 710024, China.
Abstract:
The determination of neutron spectrum for a nuclear reactor usually needs some a prior information, the detection technique and the unfolding algorithm. Based on the non-extensive statistics theory, the prior information of reactor neutron spectrum is derived, then a new method for the neutron spectrum measurement is established with the activation equation of multi-foil activation technology and the global optimization algorithm of 1stOpt optimization software. For 8 typical reactor neutron benchmark fields in IRDF-II library, the applicability of the prior information of the parameterized neutron spectrum is verified by curve fitting method, and the fitting spectrum is in good agreement with the benchmark spectrum in the thermal neutron, intermediate neutron and fast neutron energy regions. The neutron spectrum of Xi'An Pulse Reactor is measured with the above methd. The experimental spectrum is in good agreement with the calculated spectrum of MCNP program, and the maximum relative standard deviation of the activation rate between the experimental and calculated spectrum is less than 12.5%.
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