Nuclear Submarines

Tobias Ellwood Excerpts

Thursday 6th March 2014 Commons Chamber

[Mr Hammond]

The hon. Gentleman can rest assured that within the circle of nuclear experts—it is quite a small circle—there has already been discussion on these issues in the past two years. There is no requirement to notify level zero events, but we did notify the Scottish Environment Protection Agency and, of course, the military nuclear regulator. It is important to note that SEPA’s primary focus is on emissions from the site—that is, what is in the discharge from the site—and there has been no measurable change in the radiation discharge. That is the important point for people living in those communities.[Official Report, 11 March 2014, Vol. 577, c. 3MC.]

[Mr Tobias Ellwood (Bournemouth East) (Con)]

If the defect seen on the Vulcan test reactor at Dounreay were to be identified in one of the Astute or Vanguard-class submarines, what would the consequences be, from a safety perspective, for the crew on board those vessels? How would the removal of one or more submarine affect operational maritime capabilities?

[Mr Hammond]

My hon. Friend asks a good question. I emphasise again that there are no safety implications from this type of event—a submarine could continue to operate safely. This is a tiny amount of radiation in a coolant that is itself circulating in a closed system inside the sealed reactor shield, so there is no risk to the submarine crew. If such an event occurred, it would be detected almost immediately because of the daily sampling and analysis of coolant water. We are already looking at the operational implications, in a reactor of this type, of a very minor breach. As I have already told the House, the test reactor at Dounreay was restarted in 2012 and has subsequently run without any further problems. It is not absolutely clear that the result of such a minor event occurring in an operational reactor would necessarily mean that the reactor would have to be withdrawn from service. Clearly, we would do so on a precautionary basis while we considered a longer term course of action, but it is not yet clear that that would have to be the long-term state of affairs.