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Coupled fuel performance calculations in VERA and demonstration on Watts Bar unit 1, cycle 1
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.anucene.2020.107554
S. Stimpson , K. Clarno , R. Pawlowski , R. Gardner , J. Powers , B. Collins , A. Toth , S. Novascone , S. Pitts , J. Hales , G. Pastore

Abstract As the core simulator capabilities in the Virtual Environment for Reactor Applications (VERA) have become more mature and stable, increased attention has been focused on coupling Bison to provide fuel performance simulations. This technique has been a very important driver for the pellet-clad interaction challenge problem being addressed by the Consortium for Advanced Simulation of Light Water Reactors (CASL). In this article, two coupling approaches are demonstrated on quarter core problems based on Watts Bar Nuclear Plant Unit 1, Cycle 1: (1) an inline approach in which a one-way coupling is used between neutronics/thermal hydraulics (through MPACT/CTF) and fuel performance (through Bison) but no fuel temperature information is passed back to MPACT/CTF, and (2) a two-way approach (coupled) in which the fuel temperature is passed from Bison to MPACT/CTF. In both approaches, power and temperature distributions from MPACT/CTF are used to inform the Bison simulations for each rod in the core. The demonstrations presented here are the first integrated fuel performance simulations in VERA, which opens many possibilities for future work, including applications to accident-tolerant fuel efforts and transient simulations, which are of critical importance to CASL. These demonstrations also highlight the potential to move away from the current Bison-informed fuel temperature lookup table approach, which is the default in MPACT/CTF simulations, if performance improvements are made in the near future.

中文翻译:

VERA 中的耦合燃料性能计算和 Watts Bar 单元 1,循环 1 的演示

摘要 随着反应堆应用虚拟环境 (VERA) 中的核心模拟器功能变得更加成熟和稳定,人们越来越关注耦合 Bison 以提供燃料性能模拟。对于轻水反应堆高级模拟联盟 (CASL) 正在解决的小球包覆相互作用挑战问题,该技术一直是一个非常重要的驱动因素。在本文中,基于 Watts Bar 核电站 1 号机组,周期 1 的四分之一核心问题演示了两种耦合方法:(1) 一种内联方法,其中在中子学/热力液压学之间使用单向耦合(通过 MPACT/CTF ) 和燃油性能(通过 Bison),但没有燃油温度信息传回 MPACT/CTF,(2) 双向方法(耦合),其中燃料温度从 Bison 传递到 MPACT/CTF。在这两种方法中,来自 MPACT/CTF 的功率和温度分布用于通知核心中每个棒的 Bison 模拟。这里展示的演示是 VERA 中的首次集成燃料性能模拟,它为未来的工作开辟了许多可能性,包括应用于容灾燃料工作和瞬态模拟,这对 CASL 至关重要。如果在不久的将来进行性能改进,这些演示还突出了摆脱当前的 Bison-informed 燃料温度查找表方法的潜力,这是 MPACT/CTF 模拟中的默认设置。MPACT/CTF 的功率和温度分布用于为核心中的每个棒提供 Bison 模拟。这里展示的演示是 VERA 中的首次集成燃料性能模拟,它为未来的工作开辟了许多可能性,包括应用于容灾燃料工作和瞬态模拟,这对 CASL 至关重要。如果在不久的将来进行性能改进,这些演示还突出了摆脱当前的 Bison-informed 燃料温度查找表方法的潜力,这是 MPACT/CTF 模拟中的默认设置。MPACT/CTF 的功率和温度分布用于为核心中的每个棒提供 Bison 模拟。这里展示的演示是 VERA 中的首次集成燃料性能模拟,它为未来的工作开辟了许多可能性,包括应用于容灾燃料工作和瞬态模拟,这对 CASL 至关重要。如果在不久的将来进行性能改进,这些演示还突出了摆脱当前的 Bison-informed 燃料温度查找表方法的潜力,这是 MPACT/CTF 模拟中的默认设置。包括应用于容灾燃料工作和瞬态模拟,这对 CASL 至关重要。如果在不久的将来进行性能改进,这些演示还突出了摆脱当前的 Bison-informed 燃料温度查找表方法的潜力,这是 MPACT/CTF 模拟中的默认设置。包括应用于容灾燃料工作和瞬态模拟,这对 CASL 至关重要。如果在不久的将来进行性能改进,这些演示还突出了摆脱当前的 Bison-informed 燃料温度查找表方法的潜力,这是 MPACT/CTF 模拟中的默认设置。
更新日期:2020-09-01
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