[en] Methods for tracer gas test have been conceived and are proposed for use in conjunction with other techniques used during off-power pressurization tests. During pressurization tests is appears possible to quantify leaks through containment boundaries which make up one of the walls in adjacent rooms but quantification of leaks to open areas will require further development. Several gases may be used as tracers during pressurization tests but the preferred tracer gas is sulphur hexafluoride (SF₆) at an in-vault concentration of 100 μL/L if open area sampling is to be carried out of 10 μL/L if only closed room sampling is to be performed. Large values of the ratio (tracer gas concentration in containment/lower detection limit) are necessary for identification of leak sites in open areas having significant ventilation flow. It is recommended that in-station trials be carried out to test the validity of this technique. In addition, a tracer gas technique for use during on-power operation is also proposed but leak site identification and quantification during on-power tests is only possible for containment boundaries which make up the wall(s) of adjacent rooms. The use of SF₆ is required for tests conducted during on-power operation. The recommended in-vault concentration is 10 μL/L. Recommendations are made for future work, including leak tests during on-power operation

[en] Results of an experimental study on a flowing bed process for continuous hydrogen isotope separation are presented. Separation performance was low with a 25% by weight palladium on alumina adsorbent, resulting in a high tritium inventory. In addition, significant breakdown of the solid adsorbent occurred as it recirculated through the process equipment and the product streams were contaminated by the adsorbent carrier gas. Due to these problems, this flowing bed process is predicted to be uneconomic for a full scale plant

[en] The mass attenuation coefficient (μ/ρ), effective atomic number (Z_Pleff) and effective electron density (N_eff) of carbon steel and stainless steels were computed by using the WinXcom program. The μ/ρ values are higher in the photo-electric absorption and pair production region and approximately constant in the Compton scattering region. The variation in μ/ρ values is explained by partial interaction processes. The effective atomic numbers of the steels were also calculated by the Auto-Z_eff program. The Z_Pleff values of the steels were compared with experimental results for available energies and were found to be in good agreement. SS304L shows equal values of effective atomic number by both the methods in the region of interest. The electron densities of the selected steels are observed to be equal and approximately constant in the Compton scattering region. (authors)

[en] Effect of etching intervals on etchpit diameter of fission fragment tracks of ²⁵²Cf has been studied using different etching solutions. The effect is remarkable when 48 percent HF is used as an etchant and decreases as the concentration of etchant is reduced. 1.25 percent HF and etching solution consisting of HF (48 percent), H₂SO₄ (96 percent) and H₂O in the ratio 6:1:18 with suitable amount of zinc added show no such effect. (author)

[en] Results are presented on an experimental study of a flowing bed process for continuous hydrogen isotope separation. Separation performance was low with a 25% by weight palladium on alumina adsorbent, resulting in both a high adsorbent cost and tritium inventory. In addition, significant breakdown of the solid adsorbent occurred as it recirculated through the process equipment and the product streams were contaminated by the adsorbent carrier gas. Due to these problems, this flowing bed process is predicted to be uneconomic for a full scale plant

[en] The analysis for Kopal's system of Roche coordinates associated with the Roche model of a star distorted by the tidal forces of a companion star, has been extended further to obtain the metric coefficients of the Roche coordinates when terms up to second order of smallness in tidal effects are considered. (author)

[en] Molecular sieve driers have been included in the design of tritium handling systems for fusion reactors. In these systems there is a need to maintain extremely low exit dew points from the driers as well as a capability to rapidly reduce tritium concentrations following an accident. The required capacity of the driers is very high. The conventional method of regenerating these sieves after a water adsorption cycle is with hot air. However, because water is rapidly heated by microwave energy, this technology may be suitable for decreasing the bed regeneration time and hence may allow reduced capital and operating costs associated with a smaller bed. The present study was conducted to obtain preliminary information on the technical feasibility of regenerating molecular sieves with microwave energy. The study concentrated on Type 4A molecular sieve with a few tests on Type 13X sieve and also a silica gel adsorbent

No abstract available

[en] A brief literature survey of the existing conventional units and the nucleonic belt weigher is made. The design of a 250 ton per hour coal weighing unit working in conjunction with a 24 inch wide belt, running at 350 feet per minute has been attempted and a unit has been built to the above specifications. Caseium-137 line source has been used as an isotope and a 10 litre volume argon filled ionisation chamber has been used as a detector. A line source has been preferred to a point source. The unit is under trial and the accuracy of the same is being evaluated by changing the variables like particle size profile of the material deposited on the belt and sudden changes in loading. Initial trials indicate that an accuracy of +- 1 p.c. can be achieved. (auth.)

[en] Investigations were carried out to examine the individual and combined influence of a morphactin (chlorflurenol) (10-100 ppm) and gamma-irradiation(40-60 KR) on growth and yield attributes in okra (Abelmoschus esculentus (L.) Moench) Cv-Pusa Sawani. Morphactin caused inhibition of vegetative growth and weakened apical dominance. Gamma-irradiation of seeds reduced the growth and stimulated the branching. The combinations of gamma radiation and morphactin were found to inhibit the growth more vigorously. Morphactin application promoted fruit-set and yield at all the used concentrations. Gamma-irradiation enhanced the fruit-set and yield at 40 and 50 KR and reduced drastically at 60 KR. Combination of gamma radiation (40 KR) with morphactin (10-50 ppm) increased the yield while other combinations reduced this factor in okra. (author)