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in creator/contributor: "Dahl, R. E."  
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Preliminary Evaluation of Chlorine for Use as a Gas Cooled Reactor Safeguard

Description: An evaluation of chlorine in a high-temperature gascooled graphite- moderated reactor as a safeguard to control u runawav oxidation reaction was made. Experiments were performed which demonstrated the ability of a small amount of chlorine in an air stream to reduce the oxidation rate of graphite. Chlorine appeared to inhibit graphite oxidation by blocking active sites on the surface. On the basis of this mechanism, a rate law was derived which was consistent with observed behavior. (C.J.G.)
Date: March 1, 1960
Creator: Dahl, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Preliminary Evaluation of Chlorine for Use as a Gas Cooled Reactor Safeguard*

Description: A coolant line rupture during operation of a high temperature gas cooled graphite moderated reactor would present a serious hazard. The reactor would immediately depressurize and a great deal of air would be introduced into the coolant stream. As the air passed over the graphite moderator a runaway oxidation reaction would probably ensue unless an adequate safety system were available. This investigation was designed to evaluate chlorine as a reactor safeguard to be used to control a runaway re… more
Date: March 8, 1960
Creator: Dahl, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hanford Studies for EGCR Combustion Characteristics. Summary Report

Description: The temperature, geometry, and flow conditions which exist in the EGCR were duplicated in a mock-up designated as the EGCR Burning Rig to establish the combustion conditions in the reactor. The conditions under which the EGCR Burning Rig will ignite were established and an analytical model was developed which predicts these conditions. Because the Burning Rig cannot exactly dupIicate the reactor situation the final prediction of the safety of the EGCR must rest on computer calculations employin… more
Date: October 10, 1961
Creator: de Halas, D. R.; Dahl, R. E. & Jackson, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oxidation of Graphite Under High Temperature Reactor Conditions

Description: A kinetic study was conducted to provide information on oxidation of reactor graphites in the temperature range of 450 to 675 deg C and on the effects of reactor environment on oxidation rates. Among the parameters studied were chemical reactivity of the graphite, prior oxidation, a high intensity gamma flux during oxidation, variation of the surface-to-volume ratio of the graphite specimens, neutron bombardment prior to oxidation exposure, and gas flow rates. Rate equations showed apparent act… more
Date: July 1961
Creator: Dahl, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Experimental Evaluation of the Combustion Hazard to the Experimental Gas- Cooled Reactor-Preliminary Burning Rig Experiments

Description: >An assembly was constructed which simulated the moderator coolant annulus in the Experimental Gas-Cooled Reactor. This assembly was preheated to various temperatures and air was passed through the coolant annulus. Under certain conditions it was demonstrated that self-sustained combustion of the graphite could occur. Rates of temperature rise were generally less than 1 deg C/ min until the graphite temperature exceeded 700 deg C and then rise rates became very high. In these cxperimcnts, the a… more
Date: November 1961
Creator: Dahl, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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