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Title: TYPICAL VALIDATION PROCESSES OF THE 9975 PLUTONIUM PACKAGE FOR GAP PROGRAM SHIPMENTS

Authors:
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
1374416
Report Number(s):
SRNL-STI-2017-00418
DOE Contract Number:
DE-AC09-08SR22470
Resource Type:
Conference
Resource Relation:
Conference: INMM 58TH ANNUAL MEETING
Country of Publication:
United States
Language:
English

Citation Formats

Leduc, D. TYPICAL VALIDATION PROCESSES OF THE 9975 PLUTONIUM PACKAGE FOR GAP PROGRAM SHIPMENTS. United States: N. p., 2017. Web.
Leduc, D. TYPICAL VALIDATION PROCESSES OF THE 9975 PLUTONIUM PACKAGE FOR GAP PROGRAM SHIPMENTS. United States.
Leduc, D. Wed . "TYPICAL VALIDATION PROCESSES OF THE 9975 PLUTONIUM PACKAGE FOR GAP PROGRAM SHIPMENTS". United States. doi:. https://www.osti.gov/servlets/purl/1374416.
@article{osti_1374416,
title = {TYPICAL VALIDATION PROCESSES OF THE 9975 PLUTONIUM PACKAGE FOR GAP PROGRAM SHIPMENTS},
author = {Leduc, D.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 28 00:00:00 EDT 2017},
month = {Wed Jun 28 00:00:00 EDT 2017}
}

Conference:
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  • Following a drop test at the Westinghouse Savannah River Company (WSRC), radiographs of a 9975 drum package showed that separations, normal to the axial direction, had formed in the Celotex(R). Because the Celotex(R) acts as a thermal insulator, concerns arose as to the effect gaps in the material would have on the packaging components during and after a hypothetical fire transient. The effect of Celotex(R) gaps on the content temperature was estimated using a thermal model developed with the MSC/THERMAL(R) heat transfer software. The model included the effects of internal heat conduction and thermal radiation. Convection and thermal radiation boundarymore » conditions were applied to the model. The thermal analysis supported the expectation that small separations in the fiberboard insulation will not degrade the thermal performance of the 9975 package in a Hypothetical Accident Conditions (HAC) fire.« less
  • Currently, thousands of model 9975 transportation packages are in use by the US Department of Energy (DOE); the design of which has been certified by DOE for shipment of Type B radioactive and fissile materials in accordance with Part 71, Title 10 Code of Federal Regulations (CFR), or 10 CFR 71, Packaging and Transportation of Radioactive Material. These transportation packages are also approved for the storage of DOE-STD-3013 containers at the Savannah River Site (SRS). As such, the 9975 has been continuously exposed to the service environment for a period of time greater than the approved transportation service life. Inmore » order to ensure the material integrity as specified in the safety basis, an extensive surveillance program is in place in K-Area Complex (KAC) to monitor the structural and thermal properties of the fiberboard of the 9975 shipping packages. The surveillance approach uses a combination of Non-Destructive Examination (NDE) field surveillance and Destructive Examination (DE) lab testing to validate the 9975 performance assumptions. The fiberboard in the 9975 is credited with thermal insulation, criticality control and resistance to crushing. During surveillance monitoring in KAC, an increased axial gap of the fiberboard was discovered on selected items packaged at Rocky Flats Environmental Technology Site (RFETS). Many of these packages were later found to contain excess moisture. Savannah River National Laboratory (SRNL) testing has resulted in a better understanding of the relationship between the fiberboard moisture level and compaction of the fiberboard under storage conditions and during transport. In laboratory testing, the higher moisture content has been shown to correspond to higher total compaction of fiberboard material and compaction rate. The fiberboard height is reduced by compression of the layers. This change is observed directly in the axial gap between the flange and the air shield. The axial gap measurement is made during the pre-use inspection or during the annual recertification process and is a screening measurement for changes in the fiberboard.« less
  • Thermal analyses of three plutonium storage configurations (two plutonium metal and one plutonium oxide) consisting of the 3013 container within the 9975 package have been performed. All analyses are steady-state with 19 watts of Pu as contents. The analyzed conditions include allowance for storing the 9975 in a lattice configuration with stacking in a maximum ambient temperature 130 degrees F (54.4 degrees C) (assuming total loss of ventilation) and an ambient of 200 degrees F (93.3 degrees C) during accident (fire) conditions.
  • Results from the 9975 shipping package Storage and Surveillance Program at the Savannah River Site (SRS) are summarized for justification to extend the life of the 9975 packages currently stored in the K-Area Complex (KAC). This justification is established with the stipulation that surveillance activities will continue throughout the extended time to ensure the continued integrity of the 9975 materials of construction and to further understand the currently identified degradation mechanisms. The 10 year storage life justification was developed prior to storage. A subsequent report was later used to validate the qualification of the 9975 shipping packages for 10 yearsmore » in storage. However the qualification for the storage period was provided by the monitoring requirements of the 9975 Storage and Surveillance Program. This report summarizes efforts to determine a new safe storage limit for the 9975 shipping package based on the surveillance data collected since 2005 when the 9975 Storage and Surveillance Program began. The Program has demonstrated that the 9975 package has a robust design that can perform under a variety of conditions. The primary emphasis of the on-going 9975 Storage and Surveillance Program is an aging study of the 9975 Viton{reg_sign} containment vessel O-rings and the Celotex{reg_sign} fiberboard thermal insulation at bounding conditions of radiation, elevated temperatures and/or elevated humidity.« less