[en] All normal and most emergency operation conditions are covered by procedures presented in this manual. These procedures are designed to be followed by the shift crew unless specifically countermanded by a senior staff member. Strict adherence to these procedures is expected

[en] For an improved high-flux reactor for purposes of neutron scattering, isotope production, and materials irradiation, ORNL is beginning an effort to produce the world's best research reactor. We expect to achieve a peak thermal flux in a D₂O reflector of 5 x 10¹⁵ n/cm² s. Through improved beam tube design and focusing monochromators, the number of neutrons incident on the sample could be increased by an order of magnitude over the best now available. The reactor would be fully equipped with two cold sources, a hot source, and about 30 advanced instruments. The six cold guides would have a potential scientific value four times greater than the comparable facilities at the Institut Laue-Langevin. Our initial efforts have been focused on a major upgrade of the High Flux Isotope Reactor (HFIR)

[en] Included are sections covering safety limits and limiting safety system settings, limiting conditions for operation, surveillance requirements, design features, and administrative controls. An appendix deals with accidents and anticipated transients

[en] Several irradiation facilities at two of Oak Ridge National Laboratory's nuclear reactors (HFIR, ORR) are described. The range of facilities available will accommodate specimen sample sizes from a few millimeters in diameter up to 600 mm square. Nuclear characteristics of these facilities range to a maximum of 1.2 x 10¹⁹ n/m²s fast neutron flux; 2.9 x 10¹⁹ n/m²s thermal neutron flux; and 1.8 x 10¹⁰ R/h gamma flux

[en] Physics analyses have been performed to characterize the performance of the cold neutron source to be installed in the High Flux Isotope Reactor l at the Oak Ridge National Laboratory in the near future. This paper provides a description of the physics models developed, and the resulting analyses that have been performed to support the design of the cold source. These analyses have provided important parametric performance information, such as cold neutron brightness down the beam tube and the various component heat loads, that have been used to develop the reference cold source concept. (author)

[en] A new experiment to search for neutron-antineutron transitions was recently proposed for High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). In this paper the physics motivation of a new search, the scheme and the discovery potential of the proposed HFIR-based experiment are discussed

[en] This volume covers: research facilities, cooling systems, containment (heating, ventilation, air conditioning), emergency equipment, waste systems, on-site utilities, records and data accumulation, auxiliary equipment, and technical specifications requirements and administrative operating policies

[en] A new experimental facility is being developed for materials irradiation and testing at the Oak Ridge National Laboratory (ORNL) High Flux Isotope Reactor (HFIR). Details of this facility have been presented before. A prototype of this facility, the Thermosyphon Test Loop (TSTL) has been built, and experimental data have been obtained and analyzed. Pretest calculations for this facility with the RELAP5-3D code have been presented previously as well as other calculations with the TRACE code. The results of both codes were very different. RELAP5-3D predicted much higher pressures and temperatures than TRACE. This paper compares calculated results with the TSTL experimental data. Comparison of calculations with the codes RELAP5-3D and TRACE with experimental data of the new TSTL facility has shown that TRACE results agree well with the data and that RELAP5-3D calculates very high pressures and temperatures. The TRACE code is well suited to model this facility and is being used for future calculations. (authors)

[en] A variety of materials irradiation facilities exist in the High Flux Isotope Reactor (HFIR) and are planned for the Advanced Neutron Source (ANS) reactor. In 1986 the HFIR Irradiation Facilities Improvement (HIFI) project began modifications to the HFIR which now permit the operation of two instrumented capsules in the target region and eight capsules of 46-mm OD in the RB region. Thus, it is now possible to perform instrumented irradiation experiments in the highest continuous flux of thermal neutrons available in the western world. The new RB facilities are now large enough to permit neutron spectral tailoring of experiments and the modified method of access to these facilities permit rotation of experiments thereby reducing fluence gradients in specimens. A summary of characteristics of irradiation facilities in HFIR is presented. The ANS is being designed to provide the highest thermal neutron flux for beam facilities in the world. Additional design goals include providing materials irradiation and transplutonium isotope production facilities as good, or better than, HFIR. The reference conceptual core design consists of two annular fuel elements positioned one above the other instead of concentrically as in the HFIR. A variety of materials irradiation facilities with unprecedented fluxes are being incorporated into the design of the ANS. These will include fast neutron irradiation facilities in the central hole of the upper fuel element, epithermal facilities surrounding the lower fuel element, and thermal facilities in the reflector tank. A summary of characteristics of irradiation facilities presently planned for the ANS is presented. 2 tabs

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