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Title: Radioisotopic Thermoelectric Generator (RTG) Surveillance

Abstract

This lecture discusses stockpile stewardship efforts and the role surveillance plays in the process. Performance of the RTGs is described, and the question of the absence of anticipated He is addressed.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1329647
Report Number(s):
LA-UR-16-27508
TRN: US1700392
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPE AND RADIATION SOURCES; THERMOELECTRIC GENERATORS; LECTURES; PERFORMANCE; RADIOISOTOPE HEAT SOURCES; INTERSTITIAL HELIUM GENERATION; PLUTONIUM 238

Citation Formats

Mulford, Roberta Nancy. Radioisotopic Thermoelectric Generator (RTG) Surveillance. United States: N. p., 2016. Web. doi:10.2172/1329647.
Mulford, Roberta Nancy. Radioisotopic Thermoelectric Generator (RTG) Surveillance. United States. doi:10.2172/1329647.
Mulford, Roberta Nancy. 2016. "Radioisotopic Thermoelectric Generator (RTG) Surveillance". United States. doi:10.2172/1329647. https://www.osti.gov/servlets/purl/1329647.
@article{osti_1329647,
title = {Radioisotopic Thermoelectric Generator (RTG) Surveillance},
author = {Mulford, Roberta Nancy},
abstractNote = {This lecture discusses stockpile stewardship efforts and the role surveillance plays in the process. Performance of the RTGs is described, and the question of the absence of anticipated He is addressed.},
doi = {10.2172/1329647},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Technical Report:

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  • As part of the RTG fabrication sequence, Si/Ge and Si/Ge-glass substrates are coated with Corning 1720 and 7059 glass by a screen-printing process. A slurry of glass, pine oil, and terpinol is printed, followed by a burnout of the organic matter in oxygen at 500 deg C. It has been determined from overall fabrication considerations that there should be sufficient glass present to yield a fused-glass thickness of 1.2 to 1.4 mils. Glass content of the slurry, screen size, squeegee pressure, and breakaway distance are the important parameters affecting the amount of glass printed. Less variability in glass thickness ismore » experienced when the screen contacts the substrate during printing. This occurs at higher squeegee pressures. The desired glass thickness is achieved by adjusting the glass content of the slurry to the screen mesh size, i.e., less glass is needed for an 80-mesh screen than for a 105mesh screen. Not all of the slurry is retained on the substrate during printing; the fraction adhering to the screen is a function of the breakaway distance. Moderate slurry viscosity and temperature changes during screen printing have only minor effects on the thickness of the glass deposited. Routine printing of 1720 and 7059 glass slurries with 65- and 70-% glass have consistently yielded glass thicknesses between 1.2 and 1.4 mils. (auth)« less
  • The Heat Source/Radioisotopic Thermoelectric Generator shipping container is a Type B packaging design currently under development by Los Alamos National Laboratory. Type B packaging for transporting radioactive material is required to maintain containment and shielding after being exposed to the normal and hypothetical accident environments defined in Title 10 Code of Federal Regulations Part 71. A combination of testing and analysis is used to verify the adequacy of this package design. This report documents the test program portion of the design verification, using several prototype packages. Four types of testing were performed: 30-foot hypothetical accident condition drop tests in threemore » orientations, 40-inch hypothetical accident condition puncture tests in five orientations, a 21 psi external overpressure test, and a normal conditions of transport test consisting of a water spray and a 4 foot drop test. 18 refs., 104 figs., 13 tabs.« less
  • The Heat Source/Radioisotopic Thermoelectric Generator shipping counter is a Type B packaging currently under development by Los Alamos National Laboratory. Type B packaging for transporting radioactive material is required to maintain containment and shielding after being exposed to normal and hypothetical accident environments defined in Title 10 of the Code of Federal Regulations Part 71. A combination of testing and analysis is used to verify the adequacy of this packaging design. This report documents the testing portion of the design verification. Six tests were conducted on a prototype package: a water spray test, a 4-foot normal conditions drop test, amore » 30-foot drop test, a 40-inch puncture test, a 30-minute thermal test, and an 8-hour immersion test.« less