Office for Nuclear Regulation

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Heysham 2 - Tanks, Vessels and Buried Systems Intervention

Executive summary

Purpose of Intervention

The purpose of this intervention was to conduct an inspection to establish the adequacy of arrangements implemented under the site corrosion management programme. The work was carried out as part of the Office for Nuclear Regulation (ONR) planned intervention task sheet TS027 - 'Management of Corrosion - Concealed and Buried Systems' and task sheet TS023 - 'Management of Storage Tanks and Vessels'.

I carried out this inspection accompanied by the ONR Heysham 2 site inspector and an additional Structural Integrity Inspector. The inspection took place on 18th & 19th September 2017 and involved discussions with a number of EDF Energy Nuclear Generation Limited's (NGL) employees responsible for the operation and safety of the plant. A targeted plant walk down of the systems selected for sampling was also undertaken.

Interventions Carried Out by ONR

The primary aim of the inspection was to review the adequacy of the licensee's arrangements for managing plant material condition of buried pipework and storage tanks that are important for safety, against the requirements of LC 28.

Additionally, the inspection reviewed the current status for managing corrosion at Heysham 2 against the requirements of licence condition (LC) 28 (examination, maintenance, inspection and testing).

Key Findings, Inspector's Opinions and Reasons for Judgements Made

With respect to the primary aim of the inspection on management of buried pipework and storage tanks important for safety, I am broadly satisfied that the licensee has adequate arrangements in place for managing examination, inspection maintenance and testing. My inspection has identified a number of areas for improvement, however I am satisfied that the licensee is already taking the necessary steps to address my concerns through the implementation of revised processes and procedures to improve their understanding of plant material condition as part of the fleetwide corrosion management programme.

With respect to the additional aim of the inspection, I judge that Heysham 2 has demonstrated adequate progress has been made with respect to the inspection and remediation of corrosion defects.

Conclusion of Intervention

In terms of the overall intervention, I judge that the arrangements demonstrated by the licensee for the management of buried pipework, tanks, vessels and general corrosion at Heysham 2 against the requirements of LC28 currently conform to a GREEN rating with no formal action necessary.


I propose the following recommendations as a result of this intervention:

Recommendation 1: ONR should gather further information and monitor the progress of the licensee's arrangements for maintaining long term integrity of the AETP discharge pipework, to include the development and implementation of the pipework replacement and modification programme. This will be captured as a Level 4 issue and communicated to the relevant ONR Nuclear Liabilities Inspector for consideration at the next LC34 inspection at HYB site, expected to be August 2018.