An interim evaluation of the thermal stability of Cu/sub 0. 67/Y/sub 0. 25/Kr/sub 0. 08/ sputter deposits

Conference · Fri Jul 01 04:00:00 EDT 1988

OSTI ID:6880220

McClanahan, E D; Bradley, E R

Pacific Northwest Laboratory (PNL) has developed and demonstrated a pilot process for trapping and storing /sup 85/Kr recovered and purified from the dissolver off-gas stream of a nuclear fuel reprocessing plant. Ions produced in a low-pressure krypton discharge are implanted in a growing sputtered film of Cu/sub 0.67/Y/sub 0.25/Kr/sub 0.08/ deposited on the inner wall of a krypton trapping storage device (KTSD). A main objective of this work is to measure the release of /sup 85/Kr implanted in a copper-yttrium alloy. The overall release characteristics of the deposits are quite favorable for long-term storage. Both the radioactive and nonradioactive test specimens stored at temperatures not exceeding 350/degree/C have shown that the release rates measured to date are <0.1% yr/sup -1/. The release rates for the radioactive specimens were obtained for storage periods of 1.6, 1.1 and 0.4 yr for 150, 250 and 350/degree/C storage temperatures, respectively. The nonradioactive specimen has been held at temperatures ranging between 180 and 450/degree/C, but mainly at 350/degree/C, for a total storage time of 2.1 yr. Following the /approximately/10-yr monitoring period, the remaining Cu-Y-/sup 85/Kr waste form should be evaluated to better predict overall stability for the full storage period (50 to 100 yr). 5 refs., 6 figs., 2 tabs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6880220
• Report Number(s): PNL-SA-16084; CONF-880815-1; ON: DE89000400
• Country of Publication: United States
• Language: English

Related Subjects

050800 -- Nuclear Fuels-- Spent Fuels Reprocessing
052002* -- Nuclear Fuels-- Waste Disposal &amp; Storage
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALLOYS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALORIMETRY
CASKS
CHEMICAL ANALYSIS
CONTAINERS
COPPER ALLOYS
DEPOSITION
DESIGN
ELEMENTS
EVEN-ODD NUCLEI
FILMS
FLUIDS
FUEL REPROCESSING PLANTS
GASES
GRAVIMETRIC ANALYSIS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ION IMPLANTATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KRYPTON
KRYPTON 85
KRYPTON ISOTOPES
MANAGEMENT
MONITORING
NONMETALS
NUCLEAR FACILITIES
NUCLEI
QUANTITATIVE CHEMICAL ANALYSIS
RADIOACTIVE WASTE STORAGE
RADIOISOTOPES
RARE GASES
SPENT FUEL CASKS
STORAGE
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
WASTE MANAGEMENT
WASTE STORAGE
YEARS LIVING RADIOISOTOPES
YTTRIUM ALLOYS