Development and verification of PWR-core nuclear design code system NECP-Bamboo: Part III: Bamboo-Transient

Li, Yunzhao; He, Tao; Liang, Boning; Wu, Hongchun; Bai, Jiahe; Yang, Jiangcun

doi:10.1016/j.nucengdes.2019.110462

Cited by 9 publications

(1 citation statement)

References 7 publications

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“…[15] 0  is the initial point source of IFP, and the IFP of 0 0 0 0 ( , , ) rE   can be estimated by calculating the initial source points at 0  . The IFP was calculated using Equation (21).…”

Section: Adjoint Neutron Fluxmentioning

confidence: 99%

First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

et al. 2021

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Reactivity measurement is an essential part of a zero-power physics test, which is critical to reactor design and development. The rod drop experimental technique is used to measure the control rod worth in a zero-power physics test. The conventional rod drop experimental technique is limited by the spatial effect and the difference between the calculated static reactivity and measured dynamic reactivity; thus, the method must be improved. In this study, a modified rod drop experimental technique that constrains the detector neutron flux shape function based on three-dimensional space-time dynamics to reduce the reactivity perturbation and a new method for calculating the detector neutron flux shape function are proposed. Correction factors were determined using Monte Carlo N-Particle transport code and transient analysis code for a pressurized water reactor at the Ulsan National Institute of Science and Technology and Xi'an Jiaotong University, and a large reactivity of over 2000 pcm was measured using the modified technique. This research evaluated the modified technique accuracy, studied the influence of the correction factors on the modification, and investigated the effect of constraining the shape function on the reactivity perturbation reduction caused by the difference between the calculated neutron flux and true value, using the new method to calculate the shape function of the detector neutron flux and avoiding the neutron detector response function (weighting factor) calculation.

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Section: Adjoint Neutron Fluxmentioning

confidence: 99%

First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

et al. 2021

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Three-Dimensional Pin-by-Pin Transient Analysis for PWR-Core

Qin

2023

Springer Proceedings in Physics

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To ensure the safety of PWR-core operation, three-dimensional whole-core transient analysis needs to be carried out for the sake of the pin-power distribution. For this purpose, this paper presents “Bamboo-Transient 2.0”, a three-dimensional pin-by-pin transient analysis program. The program adopts a fully-implicit backward method with finite difference for time variable discretization, a method of exponential function expansion nodal (EFEN) SP3 for the neutron transport calculation, and a multi-channel model for the thermal feedback calculation. In addition, Picard iteration is used to couple the neutronics with thermal-feedback, which is intended to guarantee the convergence of coupling iteration at each time step. Moreover, the program can perform parallel computing based on Message Passing Interface (MPI) for the whole-core pin-by-pin transient analysis. This developed program has been applied to two commercial PWRs, viz. AP1000 and CNP1000. Numerical results of this application demonstrate that Bamboo-Transient 2.0 can yield much more refined results than the traditional legacy coarse-mesh neutron-diffusion programs based on assembly homogenization. Its pin-wise distributions of state parameters are reliable and thus can satisfactorily meet the requirements and purpose of safety analysis.

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A three-dimensional PWR-core pin-by-pin analysis code NECP-Bamboo2.0

Yang

Wang

et al. 2020

Annals of Nuclear Energy

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Development and verification of PWR-core nuclear design code system NECP-Bamboo: Part III: Bamboo-Transient

Cited by 9 publications

References 7 publications

First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

First application of large reactivity measurement through rod drop based on three-dimensional space–time dynamics

Three-Dimensional Pin-by-Pin Transient Analysis for PWR-Core

A three-dimensional PWR-core pin-by-pin analysis code NECP-Bamboo2.0

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