The House of Lords has urged the new government to "end indecision" over the future of nuclear power in the UK.
The Science and Technology Committee has today published a report setting out recommendations for the Government after the general election.
It says successive Governments have failed to make the most of the civil nuclear industry, causing the UK to lag behind other nations.
The Committee has also raised concerns about Brexit, and the possibility of the UK leaving the European Atomic Energy Community (Euratom), an international programme for developing the European nuclear industry.
It is urging the Government to set up a working group of industry and government representatives, to develop a plan to preserve the benefits of Euratom.
The Committee's warning comes as further doubt is thrown on the multi-billion-pound Moorside nuclear development in Cumbria.
Troubled Japanese giant Toshiba is set to become the sole owner of NuGen, the company behind Moorside, despite its financial difficulties.
Toshiba warned it could collapse due to losses of almost £4 billion in the nine months ending in December 2016.