Mk1 Design Goals

UC Berkeley’s recent project to develop a new pre-conceptual design for a Mark 1 Pebble-Bed FHR (Mk1 PB-FHR) had four major goals:

–  Believable predictions for base-load and peaking power levels using an industry-standard design code (Thermoflex)

2 archival articles describing NACC now published in the ASME Journal of Engineering for Gas Turbines and Power [28], [29]

–  Self-consistent approach to heat air directly with primary coolant using a Coiled Tube Air Heater (CTAH)

  • Provide a sufficiently detailed design for FHR decay heat management systems to enable future studies of FHR safety

–  Provide basis for establishing experiment test matrix for integral effects testing in the UCB Compact Integral Effects Test (CIET) facility

–  Provide a reference system design to use future in FHR thermal hydraulics code validation and benchmarking exercises

–  Inner and outer graphite reflector

–  Pebble injection and defueling

–  Coolant flow distribution and pressure loss

–  Neutronics/depletion/control-rod worth calculations

–  “Black-box” level of design for many of these systems

–  Include beryllium and tritium management strategies

– Provide a reference for performing future FHR life cycle assessment (LCA) studies