Under the terms of the agreement, ONR will be notified on Horizon’s schedule for procurement and make documents, activities, and premises relating to the procurement of Long Lead Items (LLIs) available for inspection.

Manufacturing of the Long Lead Items (LLIs) for the new nuclear reactor and associated technologies require a significant amount of time and are needed early in the construction phase.

The deed will provide ONR with an oversight of Horizon’s procurement activities for the LLIs including the reactor pressure vessels, in advance of Horizon applying for a full nuclear site license at Wylfa.

Additionally, the company and ONR will jointly work to ensure that all procurement activities for the LLIs are in compliance with the ONR’s standard license conditions.

Horizon licensing and permitting director Janet Wilson said: "This is a significant milestone for Horizon as it marks another step in our journey towards becoming a Nuclear Site Licensee and the construction and operation of Wylfa Newydd."

The Wylfa Newydd is scheduled to commence operations in the first half of the 2020s.

Launched in 2009, Horizon Nuclear Power aims to develop new nuclear power stations in the UK and is developing plans to construct at least 5,400MW of new nuclear power generation plant at Wylfa on the Isle of Anglesey and Oldbury-on-Severn in South Gloucestershire.