摘要:

AbstractPlenum gas temperature and internal gas pressure buildup were measured during irradiation in four vibrationally compacted UO2-2 wt% PuO2fuel rods. Two each of the four instrumented fuel rods operated to peak burnups of 9900 and 6000 MWd/ MTM, respectively.Experimental results indicate that sorbed gases and moisture released from the fuel react rapidly with the Zircaloy cladding and do not contribute to the internal pressure. The predominant modes of fission gas release from high and lower power fuel rods is different.The rates of pressure buildup in the high and low burnup fuel rods, which correspond to about 34 and 12% fission gas release, respectively, were consistent with fuel temperature-dependent fission gas release fractions predicted from postirradiation gas collection data obtained from similar fuel rods.Measured plenum gas temperatures during irradiation varied directly with coolant outlet temperature.

ISSN:0550-3043    

DOI:10.13182/NT70-A28812

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor

摘要:

AbstractThe power costs of three hypothetical reactor sites are analyzed to compare the site costs of conventionally fueled fast and thermal reactors with thorium-blanketed breeders and233U fueled light-water reactors (LWR’s). Since the most critical parameter is time, three case variations are considered. The site start-up is considered coincident with the commercial introduction of the fast reactor; and alternatively, where site start-up occurs jive and ten years after the commercial introduction of the breeder. The cost comparisons also consider the effect of U3O8price increases. The value of233U produced by thorium-blanketed breeders exceeds that of the Pu produced by238U blanketed breeders. Since the power costs of the LWR's are lower than the breeders until the price of U3O8increases, early development of the breeders may be contingent upon implementation of the crossed-progeny fueling.

ISSN:0550-3043    

DOI:10.13182/NT70-A28813

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor

摘要:

AbstractThis paper describes the effect of temperature on the mass transfer of niobium alloys in lithium as determined in thermal convection loop tests to 1300°C. All loops were operated for 3000 h in an ultrahigh vacuum environment; A consistent finding in these tests was the preferential movement of zirconium and nitrogen between heated and cooled regions, which in 1200°C tests accounted for most of the observed weight changes. At 1300°C, transport of niobium was also reflected in the weight changes, and crystalline deposits of Nb(C,N) were found on hot-leg specimens. Examination of Nb-1% Zr specimens using an electron microprobe indicated the hot-leg surfaces to be depleted of zirconium to depths of 0.002 and 0.007 in. in 1200 and 1300°C tests, respectively. The results of calculations of the diffusivity of zirconium in niobium based on these data agree well with values predicted from extrapolation of higher temperature data.

ISSN:0550-3043    

DOI:10.13182/NT70-A28814

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor

摘要:

AbstractThe fatigue crack propagation behavior of Zircaloy-2 subjected to various environmental conditions was examined within the framework of linear elastic fracture mechanics. It was found that the fatigue crack growth rate increased with increasing levels of cold work, increasing temperature, and exposure to a water environment.

ISSN:0550-3043    

DOI:10.13182/NT70-A28815

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor

摘要:

AbstractA system has been designed to evaluate MPC level concentrations of131I in reactor environments. The system provides reliable determinations of total131I concentrations even under such unfavorable sampling conditions as high relative humidity or very low concentrations. Furthermore, the fraction of methyl iodide present can also be determined from the activity distribution on the several parts of the system.Field experiments were conducted at Consolidated Edison's Indian Point No. 1 reactor. The results of these tests are presented and discussed.

ISSN:0550-3043    

DOI:10.13182/NT70-A28816

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor

摘要:

AbstractRegional enclaves of industry and associations of neighboring universities have devised formalized programs for providing internship experiences for graduate students and residencies for post-doctoral fellows. As an example of the former, seven years' activity of the Summer Engineering Practice School at Argonne National Laboratory is reviewed. Subsequent performance of former students has shown clear evidence of maturation resulting from early contact with working scientists. By-products have been significant industrial contributions by the students, and useful exchanges between industrial and academic scientists associated with the students.

ISSN:0550-3043    

DOI:10.13182/NT70-A28817

出版商:Taylor&Francis    

年代:1970

数据来源: Taylor