[en] Water aide corrosion which resulted in frequent tube failures in Dragon primary heat exchangers during operation in 19-68, led to an extensive programme of redesign and manufacture of replacement heat exchangers for installation ir. the reactor early in 1970, As one result of the first investigations into these failures some heat exchangers were redesigned using Incoloy 800 tubes. The tube bundles in Dragon heat exchanger designs are clamped, to minimise vibration, to a supporting structure. In the original heat exchangers with mild steel tubes these clamps had been made from stainless steel and the satisfactory performance of this material combination was confirmed by subsequent examination of those heat exchangers removed from the Dragon Core. The change to Incoloy 800 tube material and limited changes to the bundle geometry led to new proposals for clamp design and different material combinations. It was considered that, in the very pure helium environment of the reactor fretting corrosion or galling of the higher alloy materials at the clamps (where relative motion, in some degree, could be expected) might be a significant problem and that the performance of proposed clamp designs and material combinations should be investigated experimentally. Since it was not considered possible to predict the precise conditions with regard to vibration frequency, amplitude of movement or contact loading occurring in the reactor it was decided that these tests should be of a comparative nature using the components of the original tube and tube clamp designs as a datum in a series of identical tests, Thia report describes the series of tests carried out and the results obtained.

[en] A Fitness For Duty training program was developed to satisfy the requirements of the NRC, 10 CFR 26, 10 CFR 707 and to meet requirements at the Westinghouse Savannah River Company. Interactive videodisc technology was selected as the training medium using the TenCore authoring language. Computer-based training was chosen because of the large number of trainees, the advantages of the reduced overall cost, and the increased trainee retention of course material compared to traditional instruction. The resulting training program utilizes extensive role playing exercises in which employees and supervisors are exposed to real life situations. Extensive interactions by the trainees are required in that they must answer questions concerning the behav ior of individuals, random and for-cause drug testing, and the employee assistance program. Feedback is given in each case. Emphasis is placed on recognition of deteriorating job performance

[en] This document reports the results of the final tests carried out on seal welding features on the Test Vessel at Huckingen. (author)

[en] This document specifies and reports the results of the second phase of the experimental work carried out on the Test Vessel at Mannesmann, West Germany during the period 5th December, 1960 to 9th February, 1961. (author)

[en] This document specifies and reports the results of tests carried out at Mannesmann, West Germany during the period 16th November, 1960 to 18th December 1960. The full programme of tests will take several months to complete and reports will be made at suitable intervals to give information of the results obtained. (author)

[en] This document gives details of test procedures and results obtained on leak tests carried out at the manufacturers' works under typical boiler-shop conditions and at the reactor site during the construction period. (author)

[en] During the reporting year the LASL CTR theory group has continued to increase its efforts in the field of magnetohydrodynamics (MHD) theory as applied to the equilibrium and stability of complex toroidal confinement systems such as Scyllac and high-beta tokamaks. The second field which has seen concentrated efforts is the area of Vlasov analysis and numerical computation. Much work was done to map out and analyze high-beta electromagnetic microinstabilities acting in theta and Z-pinch implosion sheaths, and to refine several formulations of the so-called hybrid plasma model in which the ions are treated kinetically through the Vlasov equations while the electrons are considered to form a charge neutralizing MHD or drift fluid. In a third area of work, the numerical Computer Applications program has made significant contributions to the experimental programs by modeling the dynamics of Z-pinches and theta pinches using various physical models for the plasma. Finally, considerable effort has been expended on scaling studies of the feedback, wall stabilization, and staging requirements of Scyllac-like confinement systems

[en] This section summarizes some of the main accomplishments of the LASL theory group over the past year as well as identifying the most important theoretical problems currently facing the LASL program. The spectrum of problems considered covers a wide range, from low-frequency MHD and transport phenomena to high-frequency microinstability theory. Much of the effort is applied to the theta-pinch program

[en] This paper reviews current experimental collaborative efforts in the fusion community and extrapolates to operational scenarios for the Tokamak Physics Experiment (TPX) and the International Thermonuclear Experimental Reactor (ITER). Current requirements, available technologies and tools, and problems, issues and concerns are discussed. This paper specifically focuses on the issues that apply to experimental operational collaborations. Special requirements for other types of collaborations, such as theoretical or design and construction efforts, will not be addressed. Our current collaborative efforts have been highly successful, even though the tools in use will be viewed as primitive by tomorrow's standards. An overview of the tools and technologies in today's collaborations can be found in the first section of this paper. The next generation of fusion devices will not be primarily institutionally based, but will be national (TPX) and international (ITER) in funding, management, operation and in ownership of scientific results. The TPX will present the initial challenge of real-time remotely distributed experimental data analysis for a steady state device. The ITER will present new challenges with the possibility of several remote control rooms all participating in the real-time operation of the experimental device. A view to the future of remote collaborations is provided in the second section of this paper

[en] The investigation of the migration of volatile metals through graphite has included experiments to determine the effect of helium flow through graphite pores. The first stage of these experiments was to determine the permeation of helium through preferred materials. The results of this first stage are reported. Anomalous behaviour in two materials was observed in that an unexpected temperature effect was observed in one and an unexpected pressure effect in another. (author)