Context and challenges
During the 2013 outage on reactor 1 at Heysham Power Station, an anomalous result was detected during the Teletest NDT inspection of 1D1 boiler pod spine. The boiler spine is a key component in the support arrangements for the boiler and its mechanical integrity is of critical importance for reactor safety. Further inspections enabled to identified that the most likely source of this anomalous was a crack in weld 12.3. The boiler spines that were on the other 7 boilers have been inspected but no further anomalous results were detected.
The long-term solution that would allow reactor 1 to return to full power is to perform a modification in the area of weld 12.3 that would control the temperature of the weld material so as that crack creep will not occur. This modification has been achieved by inserting an insulating material in the region of the weld. In order to do this and to ensure that the insulating material remained in place, it was necessary to block off existing holes in the boiler spine.
This client, leader in nuclear, has appointed Assystem and other partners, to provide project management and design expertise, in order to confirm that all optioneering studies, detail design, manufacturing, testing and delivery correspond with the client’s requirement. Delivery of the design documentation, equipment and training was expected to be completed by the end of March 2015.
Assystem carried out optioneering studies and developed prototypes for the proposed solutions. This included the design, development, manufacturing (as well as supporting the implementation and commissioning) of plant modifications. This included: