We are refusing Q1 and Q2 of this request as we consider that it is manifestly unreasonable under regulation 12(4) (b) of the Environmental Information Regulations, because the resource required to answer the request is excessive.
We can tell you that a preliminary look at our records indicates a total of 97 safety inspections / interventions at Dungeness B from 1 April 2009. Most of these have been led by the Office for Nuclear Regulation (ONR) and at the start of this period by the Nuclear Installations Inspectorate (NII) and some have been by HSE's Hazardous Installations Directorate (HID)
We estimate that to answer Q1 & Q2 of your request would require us to review and consider these documents for release. This would involve around 50 hours of work by a Specialist Inspector in order that they could read and identify redactions on the documents and this would involve an unreasonable diversion of resources from the provision of the public services for which ONR is mandated.
However, ONR wishes to assist you as much as is practicable so we can tell you that...
The Executive Summaries of ONR Dungeness B Intervention Reports since August 2012.
In addition, ONR's quarterly Dungeness B Site Stakeholder Group (SSG) reports.
With regard to your other two questions:
ONR does not systematically record planned and unplanned (manual and automatic) reactor shut downs. Some information is, however, reported in ONR's SSG reports.
EDF Energy Nuclear Generation Ltd (NGL) provide information on plant status on their website.
Currently, each of the two reactors at Dungeness B shut down for a periodic shutdown (also known as a statutory outage) every 3 years. For this type of shutdown, the reactor cannot be started up again without the Consent of HSE/ ONR. Currently Reactor 21 is on such a periodic shutdown. The last two HSE/ ONR Project Assessment Reports relating to a Consent to restart after a periodic shutdown are at:
Exemption 12(4) (b) of the Environmental Information Regulations, because the resource required to answer the request is excessive.