Outram Park Part II: Agentic Verification, Validation and Documentation as a Human Review Gate for Nuclear Data and Neutronics Software
NJOY21 is part of a modernisation effort for NJOY2016, but mostly consists of C++ wrappers. Agentic coding represents a unique opporunity for NJOY modernisation in Rust, but agents require human expert supervision, which may be in short supply. Moreover, expert human review is the bottleneck in agentic software development as human resources are limited in this context. This work describes a methodology for how a human manager of AI agents can reasonably translate and refactor scientific software with limited domain expertise using principles borrowed from nuclear quality assurance documents. Moreover, it presents a methodology for when to allocate limited human resources for reviewing the agentically generated code. This methodology centres on agentic V&V and documentation, and it is demonstrated via construction of Monte Carlo web demos for the Rust fork of NJOY an Outram Monte Carlo (OutramMC), Rust ports of NJOY2016 and OpenMC, in Outram Park. In this work, an integrated pipeline for the Rust port of NJOY and OutramMC was demonstrated in web demos, and code to code verification and validation was performed with ICSBEP benchmarks for Godiva, HST009 and LCT008. ACE files produced with Outram Park's NJOY port were identical for more than 30 ACE files. These web demos also served as part of agentic documentation, which prepared the codebase for human review.