基于中子平衡研究增殖燃料实现CANDLE模式的最优配置

doi:10.11889/j.0253-3219.2016.hjs.39.060601

Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (6): 60601-060601.doi: 10.11889/j.0253-3219.2016.hjs.39.060601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles Next Articles

Using the neutron balance method to access the feed fuel requirements for CANDLE

YANG Kun^1,2, CHEN Jingen¹, CAI Xiangzhou¹

1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-03-09 Revised:2016-03-21 Online:2016-06-10 Published:2016-06-12
Supported by:
Supported by Strategic Priority Program of Chinese Academy of Sciences (No.XDA02010000)

Abstract

Abstract:

Background: CANDLE (Constant Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy produced) is a burnup strategy for Breed-and-Burn (B&B) reactors in which the effective neutron multiplication factor at an equilibrium state is equal to unity. The radius and fuel volume fraction of such a core play a very important role in the B&B mode of operation. However, using the Monte Carlo method to model a full CANDLE core for optimization costs too much computational effort and time. Purpose: This study aims to assess the validity of neutron balance analysis with a simplified 1D model for determination of the maximum burnup (BU) attainable in a CANDLE mode, and then apply this 1D methodology to optimize the configurations of feed fuel and core radii for a sodium-cooled core to sustain the CANDLE mode. Methods: When the maximum achievable BU of feed fuel equals the maximum burnup of the CANDLE feed fuel at equilibrium state, the k_eff value of the core is equal to unity. The neutron balance method with the 1D approach for various core radii and fuel volume fractions of feed fuel can provide a quick way to scope the optimized configuration. Results: Neutron balance analysis with the 1D approach can provide a reasonable estimation of the maximum attainable BU of feed fuel in a CANDLE reactor, despite a small inaccuracy due to the spectrum difference between the 1D and the full core models. A small size of core and a low fuel volume fraction of feed fuel display a small value of the maximum attainable BU, which implies that it is disadvantageous to sustain a CANDLE mode. However, a too big size of core or high fuel volume fraction of feed fuel may lead to k_eff>1 at equilibrium state. With the above considerations and optimization, we present a suitable core geometry and its fuel fraction to ensure the stable B&B mode of operation at equilibrium state (k_eff=1). Conclusion: The neutron balance calculation with 1D approach can save much computational time, and the optimized configurations of feed fuel to sustain a CANDLE mode are proposed based on this methodology.

Key words: CANDLE reactor, Neutron balance method, Optimized configuration, Monte Carlo method

CLC Number:

TL329⁺.2

YANG Kun, CHEN Jingen, CAI Xiangzhou. Using the neutron balance method to access the feed fuel requirements for CANDLE[J].Nuclear Techniques, 2016, 39(6): 60601-060601.

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Using the neutron balance method to access the feed fuel requirements for CANDLE

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