Proposal for modifications to US Department of Transportation specification 21PF-1 fire and shock resistant phenolic foam-insulated metal overpack. [Room temperature to 1475/sup 0/F]
Slightly enriched product uranium hexafluoride (UF/sub 6/) shipped from enriching plants for the world's nuclear power plants must be protected in order to conform to domestic and international transport regulations. The principal overpack currently in use is the US Department of Transportation (DOT) Specification 21PF-1 which protects Model 30 UF/sub 6/ cylinders (Title 49, Code of Federal Regulations, Part 178.121, Specification 21PF-1; Fire and Shock Resistant, Phenolic-Foam Insulated, Metal Overpack). Operational problems developed from both design and lack of maintenance have resulted in the entry of water into the insulation. To minimize this water entry, design modifications are necessary. Proposed modifications for existing overpacks are to be made only after any water absorbed within the insulation is reduced to an acceptable level. New 21PF-1 overpacks will be fabricated under an enhanced design. In both cases, proposed quality assurance/control requirements in the fabrication, modification, use and maintenance of the overpacks are applicable to fabricators, modifiers, owners and users. The phenolic foam is the thermal barrier, which maintains the UF/sub 6/ below its triple point in the event of exposure to elevated temperatures. Evaluation of the thermal qualities of the overpack required extensive analytical modeling correlated with experimental measurement. An experimental program was devised to measure the thermal conductivity and heat capacity of the phenolic foam from room temperature to approximately 1475/sup 0/F (1073/sup 0/K).
- Research Organization:
- Oak Ridge Gaseous Diffusion Plant, TN (USA)
- DOE Contract Number:
- AC05-84OT21400
- OSTI ID:
- 5460426
- Report Number(s):
- K/SS-471; ON: DE88005786; TRN: 88-009639
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FOAMS
SPECIFIC HEAT
THERMAL CONDUCTIVITY
PACKAGING
MODIFICATIONS
THERMAL INSULATION
URANIUM HEXAFLUORIDE
TRANSPORT
US DOT
REGULATIONS
DENSITY
FABRICATION
MECHANICAL PROPERTIES
PHENOLS
QUALITY ASSURANCE
RECOMMENDATIONS
SPECIFICATIONS
TEMPERATURE DEPENDENCE
ACTINIDE COMPOUNDS
AROMATICS
COLLOIDS
DISPERSIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROXY COMPOUNDS
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
URANIUM COMPOUNDS
URANIUM FLUORIDES
US ORGANIZATIONS
050900* - Nuclear Fuels- Transport
Handling
& Storage
050500 - Nuclear Fuels- Uranium Enrichment