SPACE-R thermionic space nuclear power system: Design and technology demonstration. Task 1.5.6, Moderator containment laboratory experiment test plant (CDRL No. 5)

Technical Report · Fri Oct 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10103516· OSTI ID:10103516

The preferred moderator being considered for SPACE-R is yttrium hydride encased in beryllium tubes. The baseline beryllium performs a dual function as it acts as a moderator and provides containment for hydrogen. The permeation rate of hydrogen from the hydride through the beryllium shell at the operating temperature is an important factor for the functionality and reliability of the Be-YHx moderator. Hydrogen containment capability of beryllium is comparable to enamel which was used in SNAP and Topaz II reactors. However, limited experimental data base exists for the hydrogen permeation through fabricated beryllium enclosures at high temperature. Permeation of hydrogen in beryllium is strongly affected by surface conditions, thickness of surface oxide, surface and bulk traps, impurity content and microstructure. The objective of this experiment is to determine the permeation rate of hydrogen from yttrium hydride and zirconium hydride through beryllium in the temperature range of 773 K--973 K. In addition, Topaz II type zirconium hydride specimens with and without the proprietary oxide coating canned in stainless steel will be tested to measure the hydrogen permeation rate. The TSET SS-canned ZrHx samples currently at Phillips Laboratory will be used for the latter test with Phillips Laboratory participation at the SPI hydrogen leak test stand. A key technology demonstration of the effectiveness of transferred arc plasma spraying of a 1 mil Molybdenum coating on the Be cladding will be performed. The effectiveness of the Molybdenum coating in preventing any interaction of Be with Stainless Steel in NaK will be assessed and demonstrated.

• Research Organization: Space Power, Inc., San Jose, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-92SF19441
• OSTI ID: 10103516
• Report Number(s): DOE/SF/19441-T5; ON: DE94001890; BR: 400403105/40040360B
• Resource Relation: Other Information: PBD: Oct 1993
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BERYLLIUM
PERMEABILITY
HYDROGEN
CONTAINMENT
MODERATORS
SPACE POWER REACTORS
YTTRIUM HYDRIDES
ZIRCONIUM HYDRIDES
EXPERIMENT PLANNING
DEMONSTRATION PROGRAMS
SAMPLE PREPARATION
LABORATORY EQUIPMENT
TEST FACILITIES
NESDPS Office of Nuclear Energy Space and Defense Power Systems
210600
POWER REACTORS, MOBILE, PROPULSION, PACKAGE, AND TRANSPORTABLE