The Thermal Hydraulics Laboratory in the Nuclear Engineering Department at the University of California, Berkeley constructed the Advanced Reactor Control and Operations (ARCO) facility in January 2018 to serve as an advanced reactor control room and operator support system test bed. ARCO is the control room for the Compact Integral Effects Test (CIET) facility that replicates primary-side flow paths and thermal hydraulic behavior of a Fluoride-salt-cooled High-temperature Reactor (FHR) using simulant fluids and scaling principles. ARCO and CIET together affords experimental operating scenarios for control strategy and user interface iterative design and evaluation for FHRs and, more generally, for advanced small modular nuclear reactor designs. Operating scenarios of primary importance for new reactor designs include rapid load-following, startup and shutdown, and multi-module operation. In addition, ARCO supports research and development of specific and new capabilities for nuclear plant control rooms. Specifically, these capabilities consist of new digital communication tools for operators, sophisticated and intuitive means of on-line data analysis, model-based fault detection for online health monitoring and prognostics, and control room cybersecurity strategies. In short, ARCO is a prototypical control system enhanced with operator support capabilities for advanced small modular nuclear reactors. This paper describes the design basis for ARCO and the forthcoming operator support systems operating alongside the CIET facility.