ITER Neutral Beam Sealing Bolts (NBSB)

This document is the Manufacturing Technical Specification for the ITER NEUTRAL BEAM SEALING BOLTS (NBSB) to be used on NB Flange Sealing System:- NBV Sealing Bolts - NB FEC Sealing Bolts The ITER Organization (hereinafter called “IO”) requires the manufacture of bolts to be incorporated into NB Flange Systems on the ITER Machine. These bolts ensure the compression of double Metallic seals (HELICOFLEX ) and shall meet all the RCCM-MR criteria defined in RB 3282 as Preloaded bolted assemblies maintaining leak tightness. The material of the bolts shall be in accordance with standard EN 10269:2013 plus requirements of product procurement specification RM 3300 of RCC-MR 2007. The ITER NEUTRAL BEAM SEALING BOLTS are currently foreseen to be manufactured in INCONEL 718 (NiCr19Fe19Nb5Mo3 [No. 2.4668]). They have been analysed according to RCC-MR §RB 3282 and document [30] which specify that Inconel 718 shall be procured through a specification based on the standard EN 10269:2013 plus requirements of product procurement specification RM 4123 of RCC-MR 2007 for hot rolled or forged bars for mechanical application of alloy No. 2.4668.