Technical Brief

Thermal-Hydraulic Model and Program Development for Helium-Cooled Accelerator-Driven System

[+] Author and Article Information
Tianji Peng

Institute of Modern Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: pengtianji@163.com

Zhiwei Zhou

Institute of Nuclear and New Energy Technology,
Tsinghua University,
Beijing 100084, China

1Corresponding author.

Manuscript received April 14, 2016; final manuscript received October 18, 2016; published online March 1, 2017. Assoc. Editor: Yanping Huang.

ASME J of Nuclear Rad Sci 3(2), 024502 (Mar 01, 2017) (6 pages) Paper No: NERS-16-1037; doi: 10.1115/1.4035333 History: Received April 14, 2016; Revised October 18, 2016

The accelerator-driven subcritical reactor system (ADS) is a kind of nuclear reactor which can burn minor actinide waste products produced from conventional reactors with inherent safety features. In this paper, the thermal-hydraulic model and a corresponding program for a 10 MW helium-cooled experimental ADS are presented. Through the analysis of the heat transfer mechanism in ADS, the thermal-hydraulic model of ADS was built, in which the solid domain is simulated with three-dimensional heat conduction model and the fluid domain is simulated with the one-dimensional quasi-static model. In order to analyze the transient characteristics of ADS with cooling system, a RELAP5–TRCAP coupling model for the cooling system was established, in which the decay heat of the target and core is considered. The results of steady condition and transients demonstrate the effectiveness of the transient model.

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Fig. 1

Configuration of reactor core. 1—Fuel zone, 2—side replaceable reflector, 3—top replaceable reflector, 4—bottom replaceable reflector, 5—hot plenum and core support, 6—side permanent reflector, 7—side shielding block, 8—riser channel, 9—reactor pressure vessel, 10—cavity cooling panels, 11—air, 12—concrete, 13—He inlet, 14—He outlet, 15—lower plenum, 16—upper plenum, 17—target tube, 18—proton beam, 19—target, and 20—header.

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Fig. 2

Geometry of target

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Fig. 3

Power density distribution of target (W cm−3)

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Fig. 4

Power distribution of core

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Fig. 5

Decay heat of target and core

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Fig. 6

Heat transfer mechanisms of ADS

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Fig. 7

Target grids (partial): (a) solid, (b) fluid, and (c) connection between target grids

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Fig. 8

Reactor nodes of solid domain: (a) top view and (b) side view

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Fig. 9

The flow of calculation procedure

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Fig. 10

Temperature comparison of target solid: (a) temperature on line 1 (x = 114 mm and z = 70 mm) and (b) temperature on line 2 (x = 114 mm and y = 114 mm)

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Fig. 11

RELAP5–TRCAP coupling model

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Fig. 12

Equivalent component of target/core

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Fig. 13

RELAP5–TRCAP coupling calculation method

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Fig. 14

Blocks temperature distribution (center section) (K)

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Fig. 15

Target temperature distribution of solid (K)

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Fig. 16

Temperature response of the target (K) (x = 114 mm and z = 70 mm)

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Fig. 17

Temperature response of target and core




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