Viscount Hanworth (Lab)

My Lords, Amendment 10 is a minor amendment and the noble Viscount, Lord Trenchard, has asked me to speak on it in his absence. I believe his amendment evinces frustration at the tendency of those who are averse to nuclear energy to exclude it from their definition of “clean energy”. He has therefore proposed that the Bill should state that clean energy means renewable energy, nuclear energy and energy produced from sources other than fossil fuels. In assessing the hazards of nuclear energy, one must separate the issues of nuclear cleanliness, by which I mean the absence of nuclear pollution, from issues of nuclear safety. The latter range from concerns about the accidental spillage of radioactive materials to the risks of rare occurrences such as the accidents of Three Mile Island, Chernobyl and Fukushima. A degree of laxity characterised the early nuclear industry, but the industry has since developed a stringent attitude towards cleanliness. The radioactive emissions of our nuclear power stations are negligible. They are a fraction of the emissions from the granite rocks of Aberdeen, and the human exposure is far less than that of a high-flying airline passenger on a scheduled flight. The industry’s attitude to cleanliness extends far beyond the question of radioactive contamination; I have seen the senior management of a nuclear power station become apoplectic at the discovery of a cigarette butt embedded in a gravel pathway. The major accidents that I mentioned were occasioned by the meltdown of nuclear power stations embodying pressurised water reactors. They have led to a heightened emphasis on the safety of such power stations. That is evident in the design of the Hinkley C power station, where the consequences of the worst imaginable malfunctions would not extend beyond the power station itself. The same is true of the current designs of small modular reactors, which are also pressurised water reactors. The SMRs employ a nuclear technology that is set to be replaced by fourth-generation technologies endowed with passive safety. A molten-salt reactor provides an example: in the unlikely event of a rupture of the containment vessel, the molten salt and the nuclear reagents would escape into wider containment, after which the nuclear reaction would cease and the salt would crystallise at 300 degrees Centigrade. Such reactors are fit to be employed close to industrial processes that require abundant heat and electricity. An unfortunate fact, to which I must testify, is that we are failing to support the development of such reactors. We are leaving it to others to develop the technologies that are vital for achieving our net zero ambitions.