The library is distributed in card image format (80 characters per record). All numbers are in FID0 format (see, for example, ANISN manual^ '). MACKLIB UTILIZATION MACKLIB can be used with any neutron and gamma-ray flux spectra to calculate the spatial distribution of neutron, gamma, and total heating, rates of atomic displacements, tritium breeding ratio, gas production, and other reactions of interest. Since the response functions in MACKLIB are flux-and density-independent, the library can be utilized for calculating the nuclear responses in one-, two-, and three-dimensional geometries for any spatial distribution of mixtures of materials. One way to calculate the nuclear responses is to employ a simple computer program to carry out the summation over energy groups of the product of the flux and the appropriate response function from MACKLIB. Another convenient way is to mix the "MACK-Activity-Tables" explicitly with the "regular transport" multigroup cross sections via the mixing tables in the transport code employed to predict the flux solution (e.g., via the 10$, 11$, and 12* arrays in ANI or the equivalent in D0T* '). The number density for each activity table should be the appropriate number for the material multiplied by a small (e.g. Positions 23 through 31 include the contribution to the neutron kerma fac-(2) tor from individual reaction types. K ' Such individual contributions are not available for materials whose neutron kerma factors were generated using the (2) direct gamma-production path v ' of MACK-IV.
7. Running Time The problem run time depends mainly on (a) number of resolved resonances; (b) size of the pointwise energy mesh; (c) method selected for calculating kerma factor; and (d) number of neutron and gamma energy groups. Typical CPU time is 1-3 min for nonresonance nuclides and 5-10 min for resonance nuclides on IBM-370/195 with 1000 energy points, '1 neutron groups, an*: 36 gamma energy groups. 8-Programming Languages The code is written in FORTRAi IV. 9. Operating System Normal operating systems for ne FORTRAN programs. 10. Machine Requirements The central memory storage requirements vary but are typically within 400 to 800 K bytes. The input/output and temporary files vary from 4 to 13 depending on the problem.
The emphasis of the present planning process is to examine potential problems, state of technical readiness, and to prioritise materials-related requirements which must be satisfied for the successful development of fusion reactors* It is important to realize that the assessments and plans describe problem areas, and the approach to solutions as seen today are significantly different from those which were outlined in 1978, and that these will have to be updated periodically. Furthermore, they should be regarded as outlining the major avenues to be explored, rather than as a detailed road map. Although a task structure will be outlined in the Program Plane, the detailed approach to the solution of specific problems will be proposed by individual investigators. Including memberships on sub-task groups, a total of over SO individuals will be involved in various stages of the operation of the PMI and HHFMCD Technical Assessments and Program Plans• The wide representation of national laboratories, universities, and industry was encouraged to remove institu tional bias to the Greatest extent possible. In conclusion, I would like to take this opportunity to thank all of the members of the Task Croup and the technical community who contributed to this effort and who continue to be the most important element in the success of the reactor technology area
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