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Wylfa Nuclear Power Station 2013 Graphite Core safety case

Date released
21 December 2020
Request number
202010051
Release of information under
Freedom of Information Act 2000

Information requested

Wylfa Nuclear Power Station 2013 graphite core safety case and any supporting documentation concerning gas flow diversion through cracked bricks and the risk of fuel melt.

Similar safety case documentation for Oldbury Nuclear Power Station leading up to end of generation.

Information released

I confirm that under Section 1 of the FOIA we do hold information pertinent to your request.

We try to be as open as possible when answering requests but your request is very broad and covers a wide-range of information. Following a sampling exercise, we established that gathering together the documentation requested in relation to Wylfa and Oldbury Nuclear Power Stations is unfortunately likely to involve a cost in excess of the £600 limit set by the government for dealing with FOI requests.This is due to the type of information requested, and how historic information is stored at ONR. Further information on this can be found in Section 12 of the FOIA. (Requests where the cost of compliance exceeds the appropriate limit). 

To help you refine your request so it can be dealt with under the appropriate limit, we have identified information that can be provided (subject to any necessary redactions). This includes the following documents:

Oldbury

  1. A Revised Safety Case for the Integrity of the Graphite Cores to the Planned End of Generation: Update of the Safety Case for Reactor 2 Following the Re-classification of the Orientation of Some Graphite Sample Strength Data and Discovery of Cracks in Top Reflector Bricks of Reactor 1
  2. A Revised Safety Case for the Integrity of the Graphite Cores to the Planned End of Generation: A Review of the Case for Both Reactors Including a Probabilistic Structural Integrity Analysis
  3. Oldbury Reactor 1 Graphite Core Integrity: Application of a Statistical Approach for the Assessment of the Benefits of Post-trip Visual Inspections
  4. A Revised Safety Case for the Integrity of the Graphite Cores to the Planned End of Generation: Proposal to operate Reactor 2 to a Mean Core Irradiation of 34GWd/t
  5. A Revised Safety Case for the Integrity of the Graphite Cores to the Planned End of Generation: Proposal to Operate Reactor 1 to a Mean Core Irradiation of 32.8GWd/t

Wylfa

  1. Annual Review of the Safety Case for the Integrity of the Graphite Cores: 2008
  2. Safety Case for the Integrity of the Graphite Cores: A Probabilistic Assessment: 2010

Exemptions applied

N/A

PIT (Public Interest Test) if applicable

N/A