Patent Number: 045432325
Section: description

DETAILED DESCRIPTION OF EMBODIMENTS The suspension arrangement for a roof reflector 1 and a thermal roof shield 2 is shown in FIG. 1. Carrier plate 3 is firstly secured to the roof 5 of the pressure vessel by means of the primary suspension bolts 4 and secondly equipped with secondary suspension bolts 6, 7 from which the roof reflector 1 and the thermal roof shield 2 are suspended. The primary suspension bolts 4 are screwed into the threaded sleeves 8 welded into the liner 9 of the pressure vessel roof 5. The secondary suspension bolts 6, 7 are equipped on both sides with a threading (not specifically shown but located generally at 10). These bolts are suspended in bores 11 of the carrier plate 3 and held by means of threaded nuts 12. The secondary suspension bolts 7 project in the bores 13 through the thermal roof shield 2, and are provided with threaded nuts 14. They thereby support the thermal roof shield. The roof reflector 1 is suspended so that the secondary suspension bolts 6 are guided from the carrier plate 3, through the bores 15 in the thermal roof shield and screwed together with the transverse bolt 16 arranged in the roof reflector 1. The layout and fastening of the suspension bolts may be seen in detail in FIG. 3. In order to define the depth of the screwing of the suspension bolt 6 in the transverse bolt 16, the suspension bolt has a shoulder 18 above onset of its threading. To provide a flat abutment of said shoulder against the transverse bolt 16, the latter transverse bolt is equipped with a spot facing 19. A castle nut 20 is screwed onto the other end of the suspension bolt 6 and secured by means of a cotter pin. A locking plate 22 serves as an additional safety element. For the conduction of the cooling gas, the suspension bolt 6 is a hollow construction whereby the cooling gas returns through an annular groove 23 in the transverse bolt 16 and a further hollow space 28 into the active zone or core of the reactor. A further embodiment of the invention is seen in FIG. 2. Here grooves 25 are arranged on the free ends of the lined tube passages 24 projecting through the liner 9. The divided rings 26 are inserted with the thermal roof shield being held between such rings 26. With lock ring 29 which is screwed to the thermal roof shield, the rings 26 are immobilized in their position. The suspension of the roof reflector 1 is again effected by means of the suspension bolts 6, which in this case, are secured in the bores 27 arranged in the thermal roof shield 2, directly at the circumference of the lined tube passage 2. The specification and drawings set forth preferred embodiments of the invention. It should be noted, however, that the invention is not limited to those specific embodiments and methods specifically disclosed, but extends instead to all embodiments, substitute and equivalent constructions falling within the scope of the invention as defined by the claims.