| 摘要 |
<p>EP--36821 A The nuclear fuel assemblies are immersed in the cooling water in the reactor core, and they include vertical guide tubes made of Zircalloy (RTM) and fixed between an upper- and a lower- plate made of stainless steel or Inconel (RTM). In the lower part of the guide tubes is a braking device which retards the downward travel of a control rod when the latter are dropped to stop the reactor. - The braking device consists of a Zircalloy sleeve spot welded inside the guide tube; and the bore dia. of the sleeve permits the fall of a control rod with some clearance. The guide tube also contains holes via which the pressurised water can escape from the tube, while also providing hydraulic shock absorption when the control rod reaches its lowest position. - Used in simple braking of control rods dropped into a reactor to produce an emergency stop. EPAB- EP--36821 B The nuclear fuel assemblies are immersed in the cooling water in the reactor core, and they include vertical guide tubes made of Zircaloy (RTM) and fixed between an upper- and a lower- plate made of stainless steel or Inconel (RTM). In the lower part of the guide tubes is a braking device which retards the downward travel of a control rod when the latter are dropped to stop the reactor. - The braking device consists of a Zircaloy sleeve spot welded inside the guide tube; and the bore dia. of the sleeve permits the fall of a control rod with some clearance. The guide tube also contains holes via which the pressurised water can escape from the tube, while also providing hydraulic shock absorption when the control rod reaches its lowest position. - Used in simple braking of control rods dropped into a reactor to produce an emergency stop. (20pp Dwg. No 2) - EP--36821 B The nuclear fuel assemblies are immersed in the cooling water in the reactor core, and they include vertical guide tubes made of Zircalloy (RTM) and fixed between an upper- and a lower- plate made of stainless steel or Inconel (RTM). In the lower part of the guide tubes is a braking device which retards the downward travel of a control rod when the latter are dropped to stop the reactor. - The braking device consists of a Zircalloy sleeve spot welded inside the guide tube; and the bore dia. of the sleeve permits the fall of a control rod with some clearance. The guide tube also contains holes via which the pressurised water can escape from the tube, while also providing hydraulic shock absorption when the control rod reaches its lowest position. - Used in simple braking of control rods dropped into a reactor to produce an emergency stop. (Dwg.2) USAB- US4535523 A Guide tubes of a fuel assembly are disassembled by cutting out the upper part of the assembly beneath expansions in orifice which fix the tubes in the assembly. The upper part of the assembly is removed, the defective fuel rod replaced, and a new upper part introduced. - Short tubes on the upper part are secured to the guide tubes by expansion shaping.</p> |
