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Pacific Northwest Laboratory Monthly Activities Report March 1966 On AEC Division of Reactor Development and Technology

Description: This report has the following sections: Summary of Activities; Civilian Power Reactors; Applied and Reactor Physics; Reactor Fuels and Materials; Engineering Development; Plutonium Recycle Program; Advanced Systems; and Nuclear Safety.
Date: April 1, 1966
Creator: Fawcett, S. L.
Partner: UNT Libraries Government Documents Department

Pacific Northwest Laboratory Monthly Activities Report for June 1966 AEC Division of Reactor Development and Technology Programs

Description: This report has the following sections: Summary; Civilian Power Reactors; Applied and Reactor Physics; Reactor Fuels and Materials; Engineering Development; Plutonium Recycle Program; Advanced Systems; and Nuclear Safety.
Date: June 1, 1966
Creator: Fawcett, SL
Partner: UNT Libraries Government Documents Department

Pacific Northwest Laboratory Monthly Activities Report APRIL 1966 on AEC Division of Reactor Development and Technology

Description: This report has the following sections: Summary of Activities; Civilian Power Reactors; Applied and Reactor Physics; Reactor Fuels and Materials; Engineering Development; Plutonium Recycle Program; Advanced Systems; and Nuclear Safety.
Date: May 1, 1966
Creator: Fawcett, S. L.
Partner: UNT Libraries Government Documents Department

NRX/EST Test Prediction Report (U)

Description: The objectives of this test are to demonstrate the ability of a NERVA-type engine system to bootstrap from a tank pressure of 45 PSIA to full power, to study the stability of the control systems, to obtain high power mapping data and to demonstrate the stability of the core at high power. System response measurements will be conducted at both low and high power points to study the control systems. The operation of the engine at 4000{sup o}R chamber temperature will be mapped from design pressure down to the pressure at which the tie rod temperature limit is reached.
Date: January 12, 1966
Partner: UNT Libraries Government Documents Department

Thermal analysis of a SNAP-8 type reactor system during atmospheric reentry. Thermo-physics technical note No. 76

Description: A thermal analysis was carried out to determine the temperature distribution in a SNAP-8 type reactor system during atmopsheric reentry. Of particular interest are the temperature distributions in the reactor upper head, the upper grid plate, and the vessel wall. The time and altitude were determined at which the upper head falls away from the reactor core due to having a portion of its wall melted through. The time and altitude of the melting of the upper grid plate and vessel wall were also determined. The effects of reentry attitude or equivalent angle of attack and initial temperature on the thermal behavior of the system were investigated. The computer programs used in various phases of the analysis were NEWTON (drag coefficient), RESTORE (reentry trajectory), and TAP (thermal model).
Date: July 12, 1966
Creator: Montgomery, L.D. & Mouradian, E.M.
Partner: UNT Libraries Government Documents Department

Thermo-Physics Technical Note No. 60: thermal analysis of SNAP 10A reactor core during atmospheric reentry and resulting core disintegration and fuel element separation

Description: A thermal analysis is carried out to determine the temperature distribution throughout a SNAP 10A reactor core, particularly in the vicinity of the grid plates, during atmospheric reentry. The transient temperatue distribution of the grid plate indicates when sufficient melting occurs so that fuel elements are free to be released and continue their descent individually.
Date: February 16, 1966
Creator: Mouradian, E.M.
Partner: UNT Libraries Government Documents Department

Abstract -- A description of low temperature hydriding of zircaloy at Hanford

Description: The two K Reactors at the Hanford Plant of the Atomic Energy Commission were retubed in 1963 with ribless Zircaloy process tubes. These tubes, 1.81 inch OD x 0.037 inch wall, were made by tube reducing methods from extruded blooms and were installed without final pickling or autoclaving. These tubes are used with once-through filtered water with a maximum coolant temperature of approximately 110 C. After approximately two years` service, it was discovered that these tubes were absorbing hydrogen in a totally unexpected and alarming manner. It was found that the downstream few feet of these tubes had a layer of massive hydride platelets, several mils thick, on the inner surface, and that the hydrogen content of the tube wall beneath this layer had increased from the as-fabricated level of 5--15 ppm to 50--75 ppm. The portion of the tubes so affected was downstream of the fuel charge. Physical testing has indicated loss of ductility but no significant changes in strength, Cold burst tests resulted in a ductile failure mode with no tendency toward brittle fracture. A program to determine the basic mechanism responsible for this phenomenon as well as practical means for its elimination will be the subject of a companion paper.
Date: March 31, 1966
Creator: Alexander, W. K.
Partner: UNT Libraries Government Documents Department

Status of special reactor process tube loadings, August 1, 1966

Description: This report gives the status of production test control tube loadings in reactor process tubes containing significant amounts of SS materials. The data are given in table form. For further description of column headings and the current discharge goal exposure plan refer to Document DUN-1048.
Date: August 8, 1966
Creator: Walton, R. P.
Partner: UNT Libraries Government Documents Department

Sample calculation -- GVR values for determining tritium separations costs

Description: This paper shows the calculations for the Gas Volume Ratio, defined as the Total Gas Volume/Target Volume. Using 20 tons of LiAlO{sub 2} as the target, 5028 cubic feet of tritium, protium, and helium are produced. The target volume equals 312.5 cubic feet of aluminate, so that the GVR = 5028/312.5 = 16.1.
Date: December 12, 1966
Creator: Bown, R. W.
Partner: UNT Libraries Government Documents Department