ABSTRACT This paper presents a VVER-1000 coolant transient benchmark calculated using Serpent 2 generated group constants in the reactor dynamics code HEXTRAN coupled with the system code SMABRE. Two different sets of group constants applying different leakage correction methods are generated. The purpose of the paper is to validate the Serpent 2-HEXTRAN–SMABRE code sequence in plant transient calculations for a commercial VVER-1000 reactor. Calculated radial power distributions, relative fission power, mass flow rate and coolant heat-up are compared to experimental data. These factors, axial power distributions, radial and axial peaking factors and axial offset are also compared to results calculated using HELIOS generated group constants provided in the benchmark. Results calculated with Serpent generated group constants agree with the experimental data mostly within measurement uncertainty. Deviations larger than measurement uncertainty are explained by the insufficiency of available data needed for the HEXTRAN–SMABRE simulation or the albedo calculations.

中文翻译：

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在 VVER-1000 冷却剂瞬变中验证 Serpent 2-HEXTRAN-SMABRE 代码序列

摘要 本文提出了一个 VVER-1000 冷却剂瞬态基准，使用反应堆动力学代码 HEXTRAN 中的 Serpent 2 生成群常数与系统代码 SMABRE 相结合计算。生成应用不同泄漏校正方法的两组不同组常数。本文的目的是在商用 VVER-1000 反应堆的电厂瞬态计算中验证 Serpent 2-HEXTRAN-SMABRE 代码序列。将计算出的径向功率分布、相对裂变功率、质量流量和冷却剂加热与实验数据进行比较。这些因素、轴向功率分布、径向和轴向峰值因素以及轴向偏移也与使用基准中提供的 HELIOS 生成的组常数计算的结果进行比较。使用 Serpent 生成的组常数计算的结果与实验数据一致，主要在测量不确定性范围内。大于测量不确定度的偏差是由于 HEXTRAN-SMABRE 模拟或反照率计算所需的可用数据不足所致。