Category Archives: WORKSHOP ON NUCLEAR REACTION DATA AND. NUCLEAR REACTORS:. PHYSICS, DESIGN AND SAFETY

Segment 2: LEVELS

This segment contains 110 files (one for each element) with all known level schemes available from ENSDF in 1998. These files are arranged and pre­processed into an easy-to-read format for nuclear reaction codes. During preprocessing all missing spins were inferred uniquely for each level from spin distributions extracted from the existing data. Electromagnetic and y-ray decay probabilities were estimated. Missing […]

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Endpoint energies (Qp-values)

Accurate measurements of Qp aid considerably the determination of the energies of individual P- emissions, and in the derivation of the mean beta energies (and gamma energies) of short-lived fission products. Rapid mass-separation techniques are used to alter the isobaric composition of the ion beams after their emission from fission targets, and high-purity Ge detectors measure the P-у coincidence and […]

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HIGH TEMPERATURE APPLICATIONS: FUEL SYNTHESIS

As shown in Table II, liquid metal and gas-cooled reactors can generate very high temperatures, which could be used to create new synthetic fuels for energy. This will be an innovative application of nuclear energy and can considerably expand its use. This is because the transportation sector is responsible for about a quarter of the total energy use and almost […]

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IRRADIATED FUEL INVENTORY

Several computer programs are commonly used to compute the changing inventory of nuclides during reactor operation and at any time after shutdown (for example, ORIGEN (Bell, 1973), FISP (Clarke, 1972; Tobias, 1978) and FISPIN (Burstall and Thornton, 1977; Burstall, 1979). Fission-product yields for each fissioning nuclide are used in conjunction with the effective group-averaged fission cross sections, decay constants and […]

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Software to Display Nuclear Data

Some of the software described below is available on CD-ROM or floppy disk, as well as through the Internet: 2.1.1 US Nuclear Data Network • CD-ROM version 1.0 of the 8th Edition of the Table of Isotopes (TOI), with Adobe Acrobat viewer to display the hypertext data — released in March 1996 by Richard B. Firestone (LBL), CD-ROM Editor: S. […]

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Construction of physical channels

The wave functions considered so far have a definite total spin S and a definite total orbital angular momentum L, since only reduced matrix ele­ments in spin-space and orbital space were calculated, see eq. (3.21). If one wants to describe scattering, the various clusters have to be combined to two fragments with angular momentum ji and j2. This leads to […]

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Isomeric fission yields

The independent fission yields of isomeric states are important in the definition of inventories for decay-heat calculations. However, these data are sparse for all fission processes apart from the thermal fission of 235U. Modelling calculations are normally used to derive values, based on the partition of the independent fission yields of nuclides among their isomeric states using the spin distributions […]

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Heavy Water Advanced Reactors

Heavy water reactors (HWRs) at the beginning of 2001 represented about 8% by number and 4.7% by capacity of all operating power reactors. With many years of operating experience Canada has developed the 700 MWe CANDU-6, which has been built in several countries outside Canada. India has also built a series of 220 MWe HWRs. Work on evolutionary HWRs is […]

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