Toby Tyas

Toby is a criticality assessor with 14 years’ experience in the nuclear industry. He has carried out criticality safety assessments for operational facilities, decommissioning projects, fissile material storage facilities and of packages intended for geological disposal. He has also produced analyses to support staged safety case reports. Toby is experienced in the use of handbook data and criticality calculations using MCNP (including the Whisper package to estimate E_PD) and also has MONK experience. He has written VBA and Python scripts for pre- and post-processing of calculations.

Toby has led several high-profile decommissioning criticality safety assessments at SL and AWE, including providing criticality advice to facilities and project teams. He has also been the criticality representative on HAZOPs and Human Factors reviews. Toby has also supported decommissioning work at UNS, UUK and LLWR. He is a SQEP QA checker and has contributed to peer reviews of criticality safety assessments and presented to Management Safety Committees. Toby has operational criticality assessment experience using the DBAA methodology at NNL and preliminary design phase experience, having supported Urenco’s Flexible Enrichment Module.

Toby has undertaken technical oversight and project management roles, acting as the technical point of contact on for NWS, projects for the Winfrith site, SL HAW Thermal Treatment and LLWR (HAW vaults and Silos). He has defined the technical approach required for work, managed resources and made regular project updates to client ICs.

Toby has considerable experience in criticality training. He runs Cerberus Nuclear’s Criticality College training programme for graduates and has provided training to NWS, UUK and Winfrith, including Cerberus Nuclear’s CARTA VR criticality training aid. Toby represents Cerberus Nuclear as a deputy member of the Working Party on Criticality and is a member of the Handbook Data and Criticality Training sub-groups.