Light-Weight Radioisotope Heater Unit (LWRHU) sequential impact tests Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Light-Weight Radioisotope Heater Unit (LWRHU) sequential impact tests


  • Author: Reimus, M.A.H.
    Creator Type: Personal
  • Author: Rinehart, G.H.
    Creator Type: Personal


  • Sponsor: United States. Office of the Assistant Secretary for Nuclear Energy.
    Contributor Type: Organization
    Contributor Info: USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)


  • Name: Los Alamos National Laboratory
    Place of Publication: New Mexico
    Additional Info: Los Alamos National Lab., NM (United States)


  • Creation: 1997-08-01


  • English


  • Content Description: The light-weight radioisotope heater unit (LWRHU) is a {sup 238}PuO{sub 2}-fueled heat source designed to provide one thermal watt in each of various locations on a spacecraft. Los Alamos National Laboratory designed, fabricated, and safety tested the LWRHU. The heat source consists of a hot-pressed {sup 238}PuO{sub 2} fuel pellet, a Pt-30Rh vented capsule, a pyrolytic graphite insulator, and a fineweave-pierced fabric graphite aeroshell assembly. A series of sequential impacts tests using simulant-fueled LWRHU capsules was recently conducted to determine a failure threshold. Sequential impacting, in both end-on and side-on orientations, resulted in increased damage with each subsequent impact. Although the tests were conducted until the aeroshells were sufficiently distorted to be out of dimensional specification, the simulant-fueled capsules used in these tests were not severely deformed. Sequential impacting of the LWRHU appears to result in slightly greater damage than a single impact at the final impact velocity of 50 m/s. Postimpact examination revealed that the sequentially impacted capsules were slightly more deformed and were outside of dimensional specifications.
  • Physical Description: 36 p.


  • Keyword: Nesdps Office Of Nuclear Energy Space And Defense Power Systems
  • Keyword: Destructive Testing
  • Keyword: Damage
  • Keyword: Radioisotope Heat Sources
  • Keyword: Impact Tests
  • STI Subject Categories: 07 Isotope And Radiation Source Technology
  • Keyword: Plutonium Oxides
  • Keyword: Safety Analysis Nesdps Office Of Nuclear Energy Space And Defense Power Systems


  • Other Information: PBD: Aug 1997


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report


  • Text


  • Other: DE97009285
  • Report No.: LA--13339-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/565659
  • Office of Scientific & Technical Information Report Number: 565659
  • Archival Resource Key: ark:/67531/metadc690571


  • Display Note: INIS; OSTI as DE97009285