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Science and Technology of Nuclear Installations
Volume 2014 (2014), Article ID 301052, 8 pages
Research Article

Subchannel Analysis of Wire Wrapped SCWR Assembly

Xi’an Jiaotong University, Xi’an, Shannxi 710049, China

Received 10 October 2013; Accepted 13 January 2014; Published 23 February 2014

Academic Editor: Liangzhi Cao

Copyright © 2014 Jianqiang Shan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Application of wire wrap spacers in SCWR can reduce pressure drop and obtain better mixing capability. As a consequence, the required coolant pumping power is decreased and the coolant temperature profile inside the fuel bundle is flattened which will obviously decrease the peak cladding temperature. The distributed resistance model for wire wrap was developed and implemented in ATHAS subchannel analysis code. The HPLWR wire wrapped assembly was analyzed. The results show that: (1) the assembly with wire wrap can obtain a more uniform coolant temperature profile than the grid spaced assembly, which will result in a lower peak cladding temperature; (2) the pressure drop in a wire wrapped assembly is less than that in a grid spaced assembly, which can reduce the operating power of pump effectively; (3) the wire wrap pitch has significant effect on the flow in the assembly. Smaller will result in stronger cross flow a more uniform coolant temperature profile, and also a higher pressure drop.