[2K07-09] Nuclear Plant Design 1

[2K08] Technical Demonstration for NuScale “VOYGR^TM”

(6) Engineering and manufacturing technology study on reactor components

*Daisuke Koike¹, Ryoji Osafune¹, Yasutomi Morimoto², Paul Boyadjian³ (1. IHI, 2. JGC, 3. NuScale Power, LLC)

Keywords:SMR, NuScale, VOYGR, Engineering and manufacturing technology

NuScale VOYGR^TM SMR power plant is an innovative design that utilizes proven light water reactor technology as well as reducing the size and simplifying the design. Martensitic stainless steel and nitrogen-strengthened austenitic stainless steel are utilized for containment vessel, which in one of key component for NuScale Power Module, due to their unique characteristics. However, there is no experience in applying these materials to large vessels, and there are technical challenges in manufacturing and welding large vessels. Therefore, welding mock-up tests were conducted with various welding processes to investigate weldability and mechanical properties. This paper presents the results of the weld mock-up tests and the welding processes being considered for application to martensitic stainless steel welding and nitrogen-strengthened austenitic stainless steel welding.