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Light-Weight Radioisotope Heater Unit Safety Analysis Report (LWRHU-SAR). Volume I. A. Introduction and executive summary. B. Reference Design Document (RDD)

Description: The orbiter and probe portions of the NASA Galileo spacecraft contain components which require auxiliary heat during the mission. To meet these needs, the Department of Energy's (DOE's) Office of Special Nuclear Projects (OSNP) has sponsored the design, fabrication, and testing of a one-watt encapsulated plutonium dioxide-fueled thermal heater named the Light-Weight Radioisotope Heater Unit (LWRHU). This report addresses the radiological risks which might be encountered by people both at the la… more
Date: October 1, 1985
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Forming of metal components for radioisotope heat sources

Description: Flight-quality iridium components can be fabricated from iridium alloys by modifying standard production processes. A large quantity of metrological and NDE data support the quality of these devices, which, in turn, justify their use in containing plutonium fuel for space system applications.
Date: January 1, 1984
Creator: Johnson, E. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cryogenic explosion environment modeling and testing of space shuttle and light-weight radioisotope heater unit interactions

Description: In order to assess the risk to the world's populace in the event of a Space Shuttle accident when radioisotope-containing heat sources are on board, testing of that system must be performed to determine release point, environments required, and the size distribution of the released fuel. To evaluate the performance of the Light-Weight Radioisotope Heater Unit (LWRHU) (101 of these 1-W items are placed on the Galileo spacecraft which will be launched from the Space Shuttle), some high-velocity i… more
Date: October 1, 1985
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inhibiting the CO/CO/sub 2/ reaction between carbon and plutonia at elevated temperatures

Description: One of the problems associated with the sometimes protracted, ground storage of space PuO/sub 2/ RTG devices is the ingrowth of carbon dioxide and carbon monoxide in the gas phase due to the cyclical reaction established between the fuel (/sup 238/PuO/sub 2/) and the carbon impact body. This ingrowth proceeds according to the two equations: xCO + PuO/sub 2/ = xCO/sub 2/ + PuO/sub 2/-x (1) and xCO/sub 2/ + xC = 2xCO, etc. (2). This reaction stops after launch because the two solid-phase reactant… more
Date: January 1, 1981
Creator: Johnson, E. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Light-Weight Radioisotope Heater Unit final safety analysis report (LWRHU-FSAR): Volume 1: A. Introduction and executive summary: B. Reference Design Document (RDD)

Description: The orbiter and probe portions of the National Aeronautics and Space Administration (NASA) Galileo spacecraft contain components which require auxiliary heat during the mission. To meet these needs, the Department of Energy's (DOE's) Office of Special Applications (OSA) has sponsored the design, fabrication, and testing of a one-watt encapsulated plutonium dioxide-fueled thermal heater named the Light-Weight Radioisotope Heater Unit (LWRHU). This report, prepared by Monsanto Research Corporatio… more
Date: October 1, 1988
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Light-Weight Radioisotope Heater Unit Safety Analysis Report (LWRHU-SAR). Volume II. Accident model document

Description: Purposes of this volume (AMD), are to: Identify all malfunctions, both singular and multiple, which can occur during the complete mission profile that could lead to release outside the clad of the radioisotopic material contained therein; provide estimates of occurrence probabilities associated with these various accidents; evaluate the response of the LWRHU (or its components) to the resultant accident environments; and associate the potential event history with test data or analysis to determ… more
Date: October 1, 1985
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Safety analysis for the Galileo Light-Weight Radioisotope Heater Unit

Description: The Light-Weight Radioisotope Heater Unit (LWRHU) will be used on the NASA Galileo Mission to provide thermal energy to the various systems on the orbiter and probe that are adversely affected by the low temperature a spacecraft encounters during a long interplanetary mission. Using these plutonia-fueled sources in 1-W increments permits employment of a single design and provides the spacecraft user the option of how many to use and where to position them to satisfy the proper thermal environme… more
Date: January 1, 1990
Creator: Johnson, E. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

/sup 238/Pu surface contamination of MHW impact shell assembly

Description: /sup 238/PuO/sub 2/ contamination of the grit blasted surface of the primary impact shell assembly (PISA) of the multi-hundred watt isotopic heat source was measured. The study determined the amount and distribution of the /sup 238/PuO/sub 2/ and characterization of its behavior during aging at 1350/sup 0/C. The results concluded that normal decontamination effectively removes the superficial /sup 238/PuO/sub 2/ but does not extract the /sup 238/PuO/sub 2/ which is deep within the grit blasted … more
Date: November 22, 1976
Creator: Schaeffer, D. R.; Johnson, E. W.; Sheehan, W. E.; Fleming, D. L. & Egleston, E. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Behavior of oxygen partial pressure over slightly substoichiometric plutonia at 1410/sup 0/K

Description: Monsanto Research Corporation is charged with processing encapsulated plutonium dioxide heat sources into radioisotopic thermoelectric generators (RTGs) to support deep-space missions. One of the problems associated with the sometimes protracted ground storage of these devices is the ingrowth of carbon dioxide and carbon monoxide in the gas phase due to the cyclical reaction established between the fuel (/sup 238/PuO/sub 2/) and the carbon impact body. This ingrowth proceeds according to the tw… more
Date: August 31, 1982
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of hydrogen embrittlement in Cr-Mo pressure vessel steels. Topical report No. 1

Description: Commercial 2-1/4 Cr-1 Mo low strength steel specimens have been tested to measure their susceptibility to hydrogen embrittlement in an environment of H/sub 2/S at 50 psig. It was found that two factors, viz. (i) the plane stress zones on the crack front in compact tension specimens and (ii) incubation time effects, seriously confounded measurements on these steels when tested by conventional rising load experiments. Because of the incubation time effect, K/sub or/ (the stress intensity at which… more
Date: August 24, 1980
Creator: Shaw, B. J. & Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Light-Weight Radioisotope Heater Unit final safety analysis report (LWRHU-FSAR): Volume 2: Accident Model Document (AMD)

Description: The purpose of this volume of the LWRHU SAR, the Accident Model Document (AMD), are to: Identify all malfunctions, both singular and multiple, which can occur during the complete mission profile that could lead to release outside the clad of the radioisotopic material contained therein; Provide estimates of occurrence probabilities associated with these various accidents; Evaluate the response of the LWRHU (or its components) to the resultant accident environments; and Associate the potential e… more
Date: October 1, 1988
Creator: Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of hydrogen embrittlement in Cr-Mo pressure vessel steels. Topical report No. 1

Description: Commercial 2 1/4 Cr-1 Mo low strength steel specimens have been tested to measure their susceptibility to hydrogen embrittlement in an environment of H/sub 2/S at 50 psig. It was found that two factors, viz. (1) the plane stress zones on the crack front in compact tension specimens, and (2) incubation time effects, seriously confounded measurements on these steels when tested by conventional rising load experiments. Because of the incubation time effect, K/sub or/ (the stress intensity at which… more
Date: August 24, 1980
Creator: Shaw, B. J. & Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aeorsol Characterization from a Simulated HCDA

Description: Environmental conditions simulating the HCDA on a reduced scale provided the following information: Aerosols resulting from the condensation of gaseous constituents without sodium generally comprise small, spherical particles (diameter 0.01 to 0.25 um) and branched chain-like structures. Aerosols resulting from the condensation of gaseous constituents with sodium generally comprise spherical, small (diameter 0.01 to 0.50 um) particles, with some branched chain-like structures and some agglomera… more
Date: June 1, 1981
Creator: Zanotelli, W. A.; Miller, G. D. & Johnson, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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