SNAP-8 refractory boiler development. Topical report 3 - Evaluation of SNAP-8, SN-1 boiler

Performance tests of SNAP-8 boile

Analysis of Scheduling Policies for a M/G/I Queue with Rework

This thesis analyzes a multi-class M/G/1 priority queueing system in which distinct job types require one service cycle and, with non-zero probability, require a second service cycle. The main objective is to find a new heuristic scheduling policy that minimizes the long-run expected holding and preemption costs. Arrival rates, service rates, and the probability of undertaking second service are all class specific. A mean value analysis (MVA) approach was employed to derive the long- run mean time in queue for each job type under each policy, thereby providing the appropriate cost equations. Numerical experiments suggest that the preemptive resume scheduling policy yields the lowest cost most frequently

Evaluation of cermet materials suitable for lithium lubricated thrust bearings for high temperature operation

Cerment materials (HfC - 10 wt% W; HfC - 10 wt% TaC - 10 wt%W; HfC - 2 wt% CbC - 8 wt% Mo;Hfn - 10 wt% W; Hfn - 10 wt% TaN - 10 wt% W; and ZrC - 17 wt% W) were evaluated for possible use as lithium-lubricated bearings in the control system of a nuclear reactor. Tests of compatibility with lithium were made in T-111 (Ta-8W-2Hf) capsules at temperatures up to 1090 C. The tendencies of HfC-TaC-W, HfC-CbC-Mo, and HfN-W to bond to themselves and to the refractory alloys T-111 and TZM when enclosed in lithium-filled capsules under a pressure of 2000 psi at 980 and 1200 C for 1933 hours were evaluated. Thermal expansion characteristics were determined for the same three materials from room temperature to 1200 C. On the basis of these tests, HfC-10 TaC-10W and HfN-10W were selected as the best and second best candidates, respectively, of the materials tested for the bearing application

Compatibility of columbium base alloys with lithium fluoride

Thermal cycling tests of lithium fluoride compatibility with columbium base alloy

A Method For the Determination of Chloric Acid

In the methods for the determination of chloric acid by reduction, metallic zinc in some form and ferrous sulphate have been the reducing agents most used, though sulphur dioxide and formaldehyde have also been employed. The conditions under which the two former reducing agents have been used have been much varied. Thus Thorpe and Eccles used the zinc-copper couple, and determined with a solution of silver the chloride formed from the chlorate. Bothamley and Thompson showed that the results by this method were too low unless sulphuric acid was added near the end of the reduction to dissolve any basic salts of zinc. By the same method Becker found the results too low and preferred to use zinc dust and a little copper sulphate. Fleissner § used zinc dust and boiled the neutral solution one hour, but Becker attained complete reduction only by using a large excess of zinc dust with sufficient sulphuric acid to dissolve it completely without the aid of heat

Use of Copper to Increase the Yield of Ethyl Bromide

It has been discovered that the addition of copper punchings to small quantities of the reaction mixture of 95 per cent ethyl alcohol, sulfuric acid, water, and sodium bromide increases the yield of ethyl bromide from 57 per cent obtained without the copper to 80 per cent. The copper reacts with the sulfuric acid producing sulfur dioxide which reduces any bromine formed back to bromide ion and thus prevents a loss of bromine and, of course, increases the yield. The presence of copper as a reducing agent prevents formation of free bromine

An Improved Method of Determining Solubility

In the continuation of work on acid sodium and acid potassium phthalates as standards in acidimetry and alkalimetry, it seemed desirable to study among other properties, the solubility of these salts

Some Features of Iowa Ground Waters, II

About two years ago the writer read before this body a paper, under the above title, giving a general statement of his work on the quality of Iowa well waters. The accumulating experience of the past two years seems to justify at this time a statement of some additional facts that seem important and which may be of interest to the Iowa Academy of Science

A Method for the Determination of Hydriodic and Hydrobromic Acids

About a year ago I presented to the Iowa Academy of Sciences a paper on a method of determining chloric acid by the reduction of the acid with metallic iron in the presence of dilute sulphuric acid, and the titration of the hydrochloric acid formed, by the method of Volhard. The same paper, somewhat extended, appeared in another periodical. In this communication it was suggested that the method might probably be used equally well for the determination of bromic and iodic acids, and two determinations of bromic acid were included in the paper

Logarithmic Factors for Use in Water Analysis

Every chemist who does work in the analysis of water frequently has occasion to calculate over data given in terms of compounds and grains per gallon, to ions per liter or parts per million. Frequently he must carry out the reverse processes and convert his ions per liter into grains of compounds per gallon in order to make his results more comprehensible to the non-technical mind. Such operations are likely to be vexatious and time-consuming