Nuclear Submarines

Lord Arbuthnot of Edrom Excerpts

Thursday 6th March 2014 Commons Chamber

[Mr Hammond]

I am grateful to the hon. Gentleman, and by and large we agree on the importance of these matters, but I am afraid I must start by saying that I am not particularly minded to take lectures on transparency from someone who was a member of the previous Government. The decisions we have made throughout this process from January 2012 have been carefully balanced. I have, of course, considered throughout whether it would be appropriate, sensible or helpful to make a public statement, and I remind him that the advice we have received throughout from the regulators and experts is that no safety issues are arising, and that this incident scores as a level zero event on the International Atomic Energy Agency’s scale—an event that requires no action and presents no risk.

We have kept the independent military nuclear safety regulator and the Scottish Environment Protection Agency informed of matters, as is proper, and I have no doubt that there will be people who say that the Scottish Government should have been informed. We will see when we hear from the representative of the Scottish National party in a moment whether it will approach this matter from a responsible and sensible point of view. Key Ministers within the Government were, of course, aware of these issues throughout.

The hon. Member for Gedling (Vernon Coaker) asked why we decided to restart the reactor. Once it was clear that there was no safety risk and that a safety case for restarting it had been built and approved by the regulators, we continued with the operation of the test reactor to fulfil its intended purpose: to have delivered the same amount of core burn, and some more, as the most aged operational reactor will have achieved by the end of its service life.

The hon. Gentleman asked about the reactors being built for the Astute submarines, which are also core H reactors. I confirm that after this issue arose, all reactors in-build were re-examined with the best equipment available, to look for signs of anything that might give any further clue as to what has happened with the core H reactor at Dounreay.

The hon. Gentleman also asked about the decision not to have a test reactor for the successor series—the PWR3 reactor. There are several technical reasons for this. The reactor is being built to an entirely different design specification. Because of the way in which technology has evolved, the engineering tolerances will be much less challenging in the PWR3 reactor and we have access to far more advanced computer modelling techniques, which can provide an adequate substitute for prototyping. However, in view of the concerns that have been expressed about this decision, I have asked the chief scientific adviser to review again the evidence on which the decision not to operate a test reactor was based, and to report back to me on the appropriateness of that decision. I will inform the House in due course of the result of that review.

The hon. Gentleman asked whether CASD is affected. It will not be, and that is the point of taking this decision today. Refuelling Vanguard during an existing planned deep-maintenance period means that the operational rotation of the Vanguard-class submarines will not be affected. That is the reason we have taken that decision. It is not a safety-related decision; it is a submarine availability-related decision.

On the question of cost and as I have said already, we expect the total cost of the measures I have announced today to be about £270 million, all of which will come from contingency provision within the submarine programme that is currently unused. We do not expect it to have any impact on the wider defence programme. The contingency within the submarine programme is more than adequate—this amount is substantially less than 10% of the total contingency in the programme.

The hon. Gentleman asked whether I intended to make further statements. Clearly, I will of course notify the House if anything of significance happens; if we make a decision to decommission the reactor at Dounreay early; or if there are any further significant developments in respect of the reactor while it is running. I stress that we have reacted properly throughout, in consultation with the regulatory authorities, and we have dealt with this matter in the same way that any minor incident in a reactor, whether military or civil, would routinely be dealt with.

[Mr James Arbuthnot (North East Hampshire) (Con)]

My right hon. Friend said that the consequences of this announcement for the Astute fleet would be the subject of further review. We all understand that the levels of radioactivity that he has announced are low, but what monitoring will be done of the cooling system in our operational Astutes to reassure the crews and all those involved that they are not in any way at risk?

[Mr Hammond]

We carry out daily sampling and analysis of the coolant water in all our nuclear submarines.