Nuclear reactor fuel assembly

Palivov skupina obsahuje svazek palivov²ch l nk (1) postaven²ch svisle v konstrukci z distan n ch m° (2) upevn n²ch na trubkov²ch kan lech (3), do kter²ch vstupuj absorp n ty e (37) upevn n na p° ce (38) s hlavic (39). Svazek palivov²ch l nk (1) je opat°en² naho°e i dole koncovkou (4) a hlavou (5) palivov skupiny obsahuj c spodn a horn desku (6, 8) s perifern mi otvory (7, 9), jimi jsou s radi ln mezerou prostr en vodic pouzdra (10). Ta vykazuj ve spodn sti kleÜtinov podava e, kter sv²mi prstencov²mi z pichy (14) obklopuj prstencov v nce (21) na trubkov²ch kan lech (3) a jsou sv²mi vnit°n mi stupni (20) nasazen na eln ch stran ch trubkov²ch kan l (3). Hlava (5) palivov skupiny obsahuje perifern pru iny (15), uspo° dan souose s vodic mi pouzdry (10) mezi horn deskou (8) a podp rn²mi kotou i (16), a st°edovou pru inu (28) ste n stla enou mezi spodn deskou (6) a horn deskou (8). Palivov skupina d le zahrnuje vodic spojnice (17), kter jsou upevn n ve spodn desce (6) a s radi ln v l proch zej d rou (18) v horn desce (8), uzamykac desku (22) spojenou pevn se spodn deskou (6) a s otvory obklopuj c mi kleÜtinov podava e v oblasti prstencov²ch z pich (14). V palivov skupin je s horn deskou (8) spojen² dut² v lcov² pl Ü (40) s pery (41). V ose palivov skupiny je na spodn desce (6) uspo° dan obj mka (29) opat°en vnit°n m osazen m (30), kter je um st n s axi ln mezerou (33) nad horn eln stranou (31) trubkov ho centr ln ho kan lu (32).\ In the present invention there is disclosed a nuclear reactor fuel assembly comprising a pack of fuel elements (1) standing vertically within a structure of spaced grates (2) attached to tubular conduits (3) receiving absorption rods (37) that are fastened on a cross piece (38) with a head (39). The pack of fuel elements (1) is provided at the top and at the bottom with a terminal (4) with a fuel assembly head (5) containing bottom and upper plates (5, 8) with peripheral holes (7, 9) through which pass guide bushes (10) with a radial clearance. These guide bushes (10) exhibit in their lower section jaw feeders encompassing by their ring-shaped recesses (14) annular rims (21) on the tubular conduits and that are inserted by their inner stages (20) on faces of these tubular conduits (3). The fuel assembly head (5) comprises peripheral springs (15) that are arranged co-axially with the guide bushes (10) between the upper plate (8) and supporting disks (16), and a central spring (28) being partially compressed between the bottom plate (6) a