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http://dx.doi.org/10.3795/KSME-A.2011.35.4.417

Mechanical Performance Evaluation of a Top End Piece for Dual Cooled Fuels  

Kim, Jae-Yong (Korea Atomic Energy Research Institute)
Yoon, Kyung-Ho (Korea Atomic Energy Research Institute)
Kim, Hyung-Kyu (Korea Atomic Energy Research Institute)
Choi, Woo-Seok (Korea Atomic Energy Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.4, 2011 , pp. 417-424 More about this Journal
Abstract
A fuel assembly consists of five major components, i.e., a top end piece (TEP), a bottom end piece (BEP), spacer grids (SGs), guide tubes (GTs) and an instrumentation tube (IT); in addition, it also includes fuel rods (FRs). The TEP/BEP should satisfy stress intensity limits according to the conditions A and B of ASME, Section III, Division 1-Subsection NB. In a dual-cooled fuel assembly, the array and position of fuel rods are different from those in a conventional PWR fuel assembly; these changes are necessary for achieving power uprating. The flow plates of the TEP and BEP have to be modified accordingly. The pattern and shape of the flow holes were newly designed. To verify the strength compatibility, the Tresca stress limit according to the ASME code was investigated in the case of an axial load of 22.241 kN. In this paper, the stress linearization procedure for strength evaluation of a newly designed TEP is presented.
Keywords
Dual Cooled Annular Fuel; Top End Piece; Stress Linearization;
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