As part of the Versatile Test Reactor (VTR) program, extensive validation work is being performed to demonstrate the fidelity of the Argonne Reactor Code (ARC) software package presently used for the core design studies. It is anticipated that this software will be also used for initial operations although additional software may be introduced at a later time to supplement or replace some components. The validation work was focused on accumulating reactor models that are consistent with the VTR and thus can be used to validate the accuracy of predictions made by the software used to design and operate the VTR.

The U.S. does not have any active experimental facilities that can neutronically mockup the VTR core design. However, in the past, the U.S. had extensive experimental facilities for fast reactor neutronics. In that regard, the ZPPR-15 experiments carried out at ANL during the 1980s work best because the fuel form is closest to the VTR design, there is a considerable amount of processed data available for use, and existing staff are already familiar with the experimental machine and measurements. Because of previous collaborative work, many of the ZPPR-15 loadings of interest have already been processed into MCNP and preliminary ARC models, and a full uncertainty quantification has already been completed for many of the ZPPR-15 measurements.

This manuscript covers the recent analysis work on the ZPPR-15 experiments and compares it with the experimental results. With respect to the ARC software components, this manuscript focuses on validation of the MC², DIF3D and GAMSOR using the ZPPR-15 experimental data.

作为多功能测试反应堆（VTR）计划的一部分，正在进行大量的验证工作，以证明当前用于核心设计研究的Argonne反应堆代码（ARC）软件包的保真度。可以预料该软件也将用于初始操作，尽管以后可能会引入其他软件来补充或替换某些组件。验证工作的重点是累积与VTR一致的反应堆模型，因此可以用来验证用于设计和操作VTR的软件所作预测的准确性。

美国没有任何能以电子方式模仿VTR核心设计的活跃实验设施。但是，过去，美国拥有用于快速反应堆中子学的广泛实验设施。在这方面，1980年代在ANL进行的ZPPR-15实验效果最好，因为燃料形式最接近VTR设计，有大量处理数据可供使用，并且现有人员已经熟悉该实验。机器和测量。由于先前的协作工作，许多感兴趣的ZPPR-15载荷已经被处理成MCNP和初步的ARC模型，并且对于许多ZPPR-15测量已经完成了完全不确定性量化。

该手稿涵盖了ZPPR-15实验的最新分析工作，并将其与实验结果进行了比较。关于ARC软件组件，该手稿着重于使用ZPPR-15实验数据对MC ²，DIF3D和GAMSOR进行验证。