Ann: Appendix 4C - quarterly, page-2

Why do they need this:
”As part of the performance testing program, alternative designs for the hot equipment, including the reactor andheat exchanger, are being developed concurrently. This equipment will be installed and tested followingcompletion of the initial phase of the performance testing program that utilises the currently installed firstgeneration hot reactor and heat exchanger. The alternative designs will also provide risk mitigation in the form ofredundancy to ensure the outcomes of the performance testing program are achieved. The material for thealternative heat exchanger design was delivered in December 2023 and fabrication of the exchanger hascommenced. Alongside this, Hatch has reached the final stages of detailed design for the next generation reactortechnology and procurement activities are already underway.”