The cause for this disastrous oversight is the flawed Department of Defense Mobility CapabilityStudy (MCS) that was preliminarily briefed to members of Congress in December 2005.
The NIA's Capability of the UK Nuclear New Build Supply Chain study said that with investment, British firms are capable of supplying 90% of the components for new nuclear plants, but the largest metal forgings and some specialist reactor parts would need to be imported.
What keeps national security experts who study this up at night, is the fact that an EMP blast has the capability to wreak havoc on critical infrastructure such as telecommunications, computer systems, and even the power grid.