PROCESSING OF 5.4-YR DECAYED Zr-U ALLOY FUEL IN THE VOLATILITY PILOT PLANT (RUNS R-5 AND R-6)
Technical Report
·
OSTI ID:4717189
Disso1ution oi two 5.4-yr decayed Zr--U alloy fuel eleraerts with 75-150 g/min of anhydrous HF was performed in two runs at 495 to 650 deg C in NaF- LiF- ZrF/sub 4/ salt. Separation of uranium from fission products was accomplished by fluorination at 500 to 520 deg C with elemental fluorine at a dual flow rate of 8 and 13 slm for 120 to 150 min. Puriiication of the UF/sub 6/ from trace fission products was accompllshed by an absorption-desorption cycle on NaF at 100 and 400 deg C, respectively. Product UF/sub 6/ was collected in a cold trap. Breakthrough of Ru/sup 106/ to the UF/sub 6/ product occurred in run R-5, and again in R-6 along with Sb/sup 125/. The breake purge gas flow and nonoptimum absorber bed operation. Ru/sup 106/ and Sb/sup 125/ d.f.'s were 5 x 10/sup 4/ and 10/sup 3/ to 10/sup 5/, respectively, after breakthrough. Other specific decontamination factors were 10/sup 9/ for Cs/sup 137/, Sr/sup 90/, and TRE BETA ; 10/sup 4/ to 10/sup 5/ for Zr--Nb/sup 95/, and 10/sup 5 / to 10/sup 7/ for Gr BETA - gamma . Tc/sup 99/, MoF/sub 6/, and Np/sup 237/ continued to contaminate the product. Proposed methods for product improvement are outlined. Fuel element dissolution rates were 2.5 to 2.9 kg/ hr. Fluorine utilization efficiency was low (2 to 3%) in both runs. Uranium losses to the waste salt were 0.36 and 0.08%. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-17-010742
- OSTI ID:
- 4717189
- Report Number(s):
- ORNL-TM-447
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ADSORPTION
ANTIMONY 125
CESIUM 137
CHEMISTRY
DECONTAMINATION
FLUORINATION
GAS FLOW
HYDROFLUORIC ACID
IMPURITIES
LITHIUM FLUORIDES
MOLYBDENUM FLUORIDES
NEPTUNIUM 237
NIOBIUM 95
REPROCESSING
RUTHENIUM 106
SEPARATION PROCESSES
SODIUM FLUORIDES
STRONTIUM 90
TECHNETIUM 99
TEMPERATURE
URANIUM ALLOYS
URANIUM HEXAFLUORIDE
ZIRCONIUM 95
ZIRCONIUM ALLOYS
ZIRCONIUM FLUORIDES
ANTIMONY 125
CESIUM 137
CHEMISTRY
DECONTAMINATION
FLUORINATION
GAS FLOW
HYDROFLUORIC ACID
IMPURITIES
LITHIUM FLUORIDES
MOLYBDENUM FLUORIDES
NEPTUNIUM 237
NIOBIUM 95
REPROCESSING
RUTHENIUM 106
SEPARATION PROCESSES
SODIUM FLUORIDES
STRONTIUM 90
TECHNETIUM 99
TEMPERATURE
URANIUM ALLOYS
URANIUM HEXAFLUORIDE
ZIRCONIUM 95
ZIRCONIUM ALLOYS
ZIRCONIUM FLUORIDES