Her comments were made after she spoke in a debate in Parliament this week on the UK's membership of Euratom - the European Atomic Energy Community, responsible for nuclear safety and security in Europe since 1957 – which Britain is set to leave at the same time as the UK leaves the EU.
Brexit Secretary David Davis subsequently confirmed that ministers will press forward with plans to leave Euratom but he also insisted there is a "strong mutual interest" for close co-operation once the UK has left the bloc.
Mrs Harrison said:
“The Government’s position paper released yesterday demonstrates the absolute commitment to maintain a close and effective relationship with the Euratom Community."
“As I made clear during this week’s debate, safeguarding has to continue under international law. It is imperative that new co-operation agreements are in place. Safeguarding is critical for the nuclear industry, and particularly for Sellafield, a community that is home to thousands of nuclear workers and the Centre of Nuclear Excellence (CoNE)."
Figures published by the Nuclear Industry Association last month showed that the majority of Cumbrian nuclear employees - 14,707 - are based in Trudy Harrison's constituency.
She added: "I welcome the Government’s commitment to ensuring a smooth transition to a UK nuclear safeguards regime with no interruption in safeguards arrangements and to provide certainty and clarity to industry."
“As vice chair of the Nuclear All Party Parliamentary Group, I hope to facilitate the creation of a cross party working group which will allow further scrutiny of the Government’s progress throughout the negotiations.”