The transfer of material from one Calder Hall site analytical laboratory to another was 3 grams over what was specified in the Operating Rule, which as always is based on very conservative data. It was at all times safely contained within the transfer process system.

During a routine Health Physics survey, localised contamination was identified in the discharge bay on Calder Hall’s Reactor 1. The area was safely evacuated in line with well established procedures and appropriate barriers erected. Analysis of the contamination has shown that while the level is below the Ionising Radiation Regulations reporting
threshold it is greater than the 10% notification level. Initial indications show no personal contamination
as a result of the contamination.

Within a redundant maintenance transfer bay a pipe is being monitored following the discovery of a small pin hole. Any resulting liquor is being collected via a designated contained route. The situation is being addressed and tracked through recognised operational processes.

All the incidents are being thoroughly investigated and managed in a professional manner. All have been classified as Below Scale on the International Nuclear Event Scale.