Abstract: An ultra-low silicon wire for welding having excellent porosity resistance and electrodeposition coating properties is provided. The ultra-low silicon wire for welding having excellent porosity resistance and electrodeposition coating properties includes: by wt %, 0.001 to 0.30% of C; 0.15% or less of Si; 0.50 to 3.00% of Mn; 0.030% or less of P; 0.030% or less of S; and a balance of Fe and inevitable impurities.

Abstract: A Disclosed is a long-lifespan in-core instrument having an extended lifespan due to an enhanced combustion lifespan of an emitter. A central tube and an outer sheath tube distanced from the outer circumferential surface of the central tube are provided. Self-powered neutron detectors are placed between the central tube and outer sheath tube. Each self-powered neutron detector includes an emitter of a material having a neutron reaction cross section that is comparatively smaller than that of rhodium. A background detector for compensating for the background noise signal; core exit thermocouples for detecting the core exit temperature; and filler wires filling in the space between the self-powered neutron detectors, background detector and core exit thermocouples are provided.