No abstract available

[en] The original version of this report tabulates critical masses of simple systems, which have been measured through the year 1963. This revision adds data through October 1975, and modifies some of the old critical specifications that have been reevaluated. The old format and symbolism are retained to simplify reproduction

[en] This is a glossary of terms generally encountered in the literature of nuclear criticality and criticality safety. Terms sometimes misused are emphasized. 7 refs

[en] A table of contents for LA-7170-MS is provided, and publications of criticality specifications that appeared in 1978 and 1979 are listed. The table was omitted from the original document. An abstract of the original report appeared in Energy Research Abstracts, Volume 3: 43410

[en] Comments by Roy Reider on chemical criticality control, the fundamentals of safety, policy and responsibility, on written procedures, profiting from accidents, safety training, early history of criticality safety, requirements for the possible, the value of enlightened challenge, public acceptance of a new risk, and on prophets of doom are presented

No abstract available

[en] This account describes critical and subcritical assemblies operated remotely at the Pajarito Canyon Site at the Los Alamos National Laboratory. Earliest assemblies, directed exclusively toward the nuclear weapons program, were for safety tests. Other weapon-related assemblies provided neutronic information to check detailed weapon calculations. Topsy, the first of these critical assemblies, was followed by Lady Godiva, Jezebel, Flattop, and ultimately Big Ten. As reactor programs came to Los Alamos, design studies and mockups were tested at Pajarito Site. For example, nearly all 16 Rover reactors intended for Nevada tests were preceded by zero-power mockups and proof tests at Pajarito Site. Expanded interest and capability led to fast-pulse assemblies, culminating in Godiva IV and Skua, and to the Kinglet and Sheba solution assemblies

[en] A brief historical account of the critical experiments at the Pajarito Canyon site at Los Alamos from the 1940s to the present is presented. Numerous photographs are included

[en] This document is to satisfy the requirement for technical specifications spelled out in ERDA Manual Chapter 0540, ''Safety of ERDA-Owned Reactors.'' Technical specifications are defined in Sec. 0540-048, and the requirement for them appears in Sec. 0540-015. The following technical specifications replace the document, ''Operating Limits for the Los Alamos Critical Assembly Facility,'' revised May 27, 1971

[en] The Los Alamos critical assembly layout is designed to facilitate personnel protection by means of remote operation and stringent procedural controls during nonoperating periods. Public protection is straightforward because of the small fission-product inventory, essentially ambient pressures, and moderate temperatures