Two important build milestones have been achieved on the fifth Astute class submarine - one of which was the first approval to proceed with the build of reactor components within the NAS.
The second was a payment milestone, to complete fabrication of the pressure hull frames that strengthen unit 5.1 from the reactor compartment.
Project Manager, Mark Walker, said: "The frames for the pressure hull units are flowing through the facility nicely, with a steady supply of material for the fabrication process."
Work is progressing on the two reactor containment bulkheads.
Source: BAE Systems Submarine Solutions "Signature" newsletter, September 2010