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research-article

Neutronic Study of Burnable Poison Materials and Their Alternative configurations in FCM loaded PWR Fuel Assembly

[+] Author and Article Information
Muhammad/Q Awan

School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China
awan-necp@stu.xjtu.edu.cn

Liangzhi Cao

School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China
caolz@mail.xjtu.edu.cn

Hongchun Wu

School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China
hongchun@mail.xjtu.edu.cn

Chuanqi Zhao

Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing, 100142, China
zhaochuanqi@chinansc.cn

1Corresponding author.

ASME doi:10.1115/1.4039971 History: Received October 19, 2017; Revised April 07, 2018

Abstract

Use of FCM fuel in LWRs is an attractive option for existing and future generations of these reactors to make them accident tolerant in nature. Present work focuses on the neutronic study of the use of burnable material in various configurations to control the excess reactivity and keeping the MTC feedback negative for entire cycle length. Erbia and gadolinia, two conventional materials are used in three different configuration including QUADRISO, BISO and Matrix Mix forms. Results obtained from the implicit random treatment of the double heterogeneity of TRISO, QUADRISO and BISO particles show that the erbia is the best material to be used in QUADRISO and Matrix Mix configurations with lowest reactivity swing for the life cycle and residual poison well below 0.5 %. Gadolinia is usable in FCM environment only in the BISO form where enhanced self-shielding controls the depletion performance of the material. The gadolinia has almost zero residual poison at EOC; however, it has relatively large reactivity swing, which will need more micromanagement of the control rods during the plant operations. At BOC, erbia loaded assemblies have shown an increase in negative value of MTC compared with reference due to presence of resonance peak in erbium near 1 eV. The finally recommended material-configuration combinations have shown the excess reactivity containment in desired manner with good depletion performance and negative feedback of the MTC for life cycle.

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