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research-article

Subchannel Analysis of Thermal-Hydraulics in A Fuel Assembly with Inner Duct Structure of A Sodium cooled Fast Reactor

[+] Author and Article Information
Norihiro Kikuchi

Japan Atomic Energy Agency, 4002 Narita-cho, Oarai, Ibaraki, 311-1393, Japan
kikuchi.norihiro@jaea.go.jp

Yasutomo Imai

NDD Corporation, 1-1-6 jonan, Mito, Ibaraki, 310-0803, Japan
y.imai@nddhq.co.jp

Ryuji Yoshikawa

Japan Atomic Energy Agency, 4002 Narita-cho, Oarai, Ibaraki, 311-1393, Japan
yoshikawa.ryuji@jaea.go.jp

Norihiro Doda

Japan Atomic Energy Agency, 4002 Narita-cho, Oarai, Ibaraki, 311-1393, Japan
doda.norihiro@jaea.go.jp

Masaaki Tanaka

Japan Atomic Energy Agency, 4002 Narita-cho, Oarai, Ibaraki, 311-1393, Japan
tanaka.masaaki@jaea.go.jp

Hiroyuki Ohshima

Japan Atomic Energy Agency, 4002 Narita-cho, Oarai, Ibaraki, 311-1393, Japan
ohshima.hiroyuki@jaea.go.jp

1Corresponding author.

ASME doi:10.1115/1.4042191 History: Received October 31, 2017; Revised November 27, 2018

Abstract

In the design study of an advanced loop-type sodium-cooled fast reactor in Japan, a specific fuel assembly (FA) named FAIDUS (Fuel Assembly with Inner DUct Structure) has been considered as one of the measures to enhance safety of the reactor during the core disruptive accident. Evaluations of thermal-hydraulics in FAIDUS under various operation conditions are required to confirm its design feasibility. In this study, thermal-hydraulics in FAIDUS is investigated with the in-house subchannel analysis code named ASFRE, which can be applied to a wire-wrapped fuel pin bundle using a distributed resistance model (DRM) and a turbulence mixing model. Before analysis of the FAIDUS, validations of the DRM and the turbulence mixing model were performed respectively in comparisons with the pressure drop coefficients through the simulated FAs obtained by water experiments and the temperature distribution in the simulated FAs obtained by sodium experiments. After confirmation of applicability of ASFRE to FAs through these validations, thermal-hydraulic analyses of FAIDUS and a typical FA without the inner duct were conducted for comparison. The numerical results indicated that significant asymmetric temperature distribution did not occur in FAIDUS compared to the distribution in the typical FA at a high flow rate condition. In addition, it was shown that the temperature distribution in FAIDUS was similar to that in the typical FA at a low flow rate condition, because the local flow acceleration and the flow redistribution caused by the buoyancy force was much effective in FAIDUS.

Copyright (c) 2018 by ASME
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