Safety Case Production and Technical Support

A new fault had been defined for inclusion within the Safety Case, and associated Fault Schedules, for a fleet of nuclear power stations. To support the modification of the site Safety Case, a safety submission was required for each station to demonstrate that the radiological risk potentially arising from the initiating fault is tolerable and As Low As Reasonably Practicable (ALARP). This involved the identification of adequate protection to minimise the fault consequence and to demonstrate that this protection can perform its duty under fault conditions and for the duration required.

To achieve this, vital expertise came from human factors specialists, chemists, transient analysts, and mechanical and electrical engineers. The safety submission was required to implement adequate controls and maintenance regimes for any plant with a claimed safety measure. Supporting procedures and training were also required where the protection is dependent on operator action. Following the approval from appropriate governance stakeholders (internal and external to the client), the submission ultimately updated the suite of living safety documentation for each site.