Abstract:
Austenitic steel for nuclear reactor components is largely resistant to radiation-induced stress cracking corrosion if the silicon, phosphorus and sulphur content is reduced by comparison with commercial grades of steel and its grain structure has finely dispersed and distributed carbide deposits, especially niobium carbide. The finely dispersed distribution can be obtained if larger niobium deposits are first disagregated by annealing at 1100 to 1150 DEG C and the carbide is deposited by subsequent annealing at temperatures of about 750 DEG C.
Abstract:
The invention relates to a cladding tube (1) which is practically homogenous as far as chemical composition and particle structure is concerned and is made of zircalloy components, exhibiting an elongation at rupture of at least 20 % with a ductility parameter gamma = (a)
Abstract:
A tube for forming a nuclear fuel assembly guide tube or sheath. The tube is made of an alloy containing 1.0-1.7 wt % of tin, 0.55-0.8 wt % of iron, 0.20-0.60 wt % total of chromium and/or vanadium, and 0.10-0.18 wt % of oxygen, carbon and silicon being present in amounts of 100-180 ppm and 50-120 ppm respectively, while the only other components of the alloy are zirconium and the unavoidable impurities.
Abstract:
Austenitic steel for nuclear reactor components is largely resistant to radiation-induced stress cracking corrosion if the silicon, phosphorus and sulphur content is reduced by comparison with commercial grades of steel and its grain structure has a mean grain diameter of under some 20 mu m. This grain structure is obtained if annealing processes above some 950 DEG C are avoided. Finely dispersed carbide deposits in the grains also provide increased resistance to radiation-induced stress cracking corrosion if the annealing temperatures are increased to about 1075 DEG C.
Abstract:
The invention relates to a device for the catalytic conversion of hydrogen. The device is used for eliminating hydrogen which has been produced as a result of an incident. Said hydrogen is eliminated effectively and without producing a backfire. The aim of the invention is to improve the effect of the recombiner and to prevent the containment atmosphere from heating up. To this end, a recombiner (8) with a plurality of catalytically effective catalyst elements (8a) is arranged in the containment containing the gas mixture, a cooling device (10) is placed downstream from the recombiner (8) and a further cooling device (4) is placed upstream of the recombiner (8).
Abstract:
The present invention relates to a method of manufacturing tubes of zirconium based alloys for usage in nuclear reactors. According to the invention one can achieve good resistance towards general corrosion, improved transversal creep strength and reduced irradiation induced growth by subjecting a beta -quenched tube a vacuum anneal in the alpha -phase range at a temperature and a time sufficient to obtain an annealing parameter value A in the range 3.4 x 10 to 3.4 x 10 .
Abstract:
The present invention relates to a nuclear fuel element for a pressurized-water reactor, PWR. The fuel element comprises cladding tubes or cladding tubes and guide tubes, whose composition and manufacture are so adapted that the cladding or the cladding and the guide tubes during reactor operation show a good resistance to general corrosion and a low hydrogen contents. This can be achieved by allowing the cladding or the cladding and the guide tubes, when being manufactured, to undergo heat treatments which are of such a nature that the cumulative annealing parameter SIGMA A = SIGMA ti exp (-Q/RTi) is at most 1.25 x 10 , at Q/R = 31726 K.
Abstract translation:本发明涉及一种用于加压水反应堆的核燃料元件,PWR。 燃料元件包括包层管或包覆管和导管,其组成和制造适于在反应器操作期间使包层或包层和导管显示出良好的抗一般腐蚀性和低氢含量。 这可以通过允许包层或包层和导管在制造时进行热处理来实现,这些热处理的性质使得累积退火参数SIGMA A = SIGMA ti exp(-Q / RTi)至多为 1.25×10 14,在Q / R = 31726K。