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Title: Gap Analysis of Storage Conditions between NNSS and LANL for SAVY 4000 Use

Abstract

As part of the gap analysis for utilizing the SAVY 4000® at NNSS, the hydrogen gas generation rate and the effect of atmospheric pressure changes on the maximum normal operating pressure (MNOP) of the SAVY container must be evaluated because the nuclear material characteristics and atmospheric conditions will not be the same for NNSS and LANL. This paper documents this analysis and demonstrates that the LANL SAVY Safety Analysis Report (SAR) is bounding with respect to the Nevada facilities.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1278753
Report Number(s):
LA-UR-16-25540
TRN: US1601664
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; SAFETY ANALYSIS; NEVADA TEST SITE; STORAGE; ATMOSPHERIC PRESSURE; CONTAINERS; PRESSURE DEPENDENCE; PERFORMANCE; NUCLEAR MATERIALS MANAGEMENT; INTERSTITIAL HYDROGEN GENERATION

Citation Formats

Reeves, Kirk Patrick, Smith, Paul Herrick, Stone, Timothy Amos, Becker, Chandler Gus, Karns, Tristan, and Veirs, Douglas Kirk. Gap Analysis of Storage Conditions between NNSS and LANL for SAVY 4000 Use. United States: N. p., 2016. Web. doi:10.2172/1278753.
Reeves, Kirk Patrick, Smith, Paul Herrick, Stone, Timothy Amos, Becker, Chandler Gus, Karns, Tristan, & Veirs, Douglas Kirk. Gap Analysis of Storage Conditions between NNSS and LANL for SAVY 4000 Use. United States. doi:10.2172/1278753.
Reeves, Kirk Patrick, Smith, Paul Herrick, Stone, Timothy Amos, Becker, Chandler Gus, Karns, Tristan, and Veirs, Douglas Kirk. 2016. "Gap Analysis of Storage Conditions between NNSS and LANL for SAVY 4000 Use". United States. doi:10.2172/1278753. https://www.osti.gov/servlets/purl/1278753.
@article{osti_1278753,
title = {Gap Analysis of Storage Conditions between NNSS and LANL for SAVY 4000 Use},
author = {Reeves, Kirk Patrick and Smith, Paul Herrick and Stone, Timothy Amos and Becker, Chandler Gus and Karns, Tristan and Veirs, Douglas Kirk},
abstractNote = {As part of the gap analysis for utilizing the SAVY 4000® at NNSS, the hydrogen gas generation rate and the effect of atmospheric pressure changes on the maximum normal operating pressure (MNOP) of the SAVY container must be evaluated because the nuclear material characteristics and atmospheric conditions will not be the same for NNSS and LANL. This paper documents this analysis and demonstrates that the LANL SAVY Safety Analysis Report (SAR) is bounding with respect to the Nevada facilities.},
doi = {10.2172/1278753},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

Technical Report:

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  • SAVY-4000 containers were developed as a part of DOE M 441.1-1 to protect workers who handle stored nuclear material from exposure due to loss of containment.1 The SAVY-4000 is comprised of three parts: a lid, a container, and a cross-linked fluoropolymer O-ring. Degradation of the O-ring during use could limit the lifetime of the SAVY-4000. In order to quantify the chemical changes of the Oring over time, the molecular weight between crosslinks was determined as a function of aging conditions using a swelling technique. Because the O-ring is a cross-linked polymer, it will absorb solvent into its matrix without dissolving.more » The relative amount of solvent uptake can be related to the degree of crosslinking using an equation developed by Paul Flory and John Rehner Jr3. This method was used to analyze O-ring samples aged under thermal and ionizing-radiation conditions. It was found that at the harsher thermal gaining conditions in absence of ionizing-radiation the average molecular weight between crosslinks decreased, indicating a rise in crosslinks, which may be attributable to advanced aging with no ionizing radiation present. Inversely, in the presence of ionizing radiation it was found that material has a higher level of cross-linking with age. This information could be used to help predict the lifetime of the O-rings in SAVY-4000 containers under service conditions.« less
  • In accordance with the SAVY-4000 Surveillance Plan [1] and DOE M441.1-1 requirements, storage container surveillance continued through fiscal year 2017 at Los Alamos National Laboratory. Surveillance items for the year consisted of 8 SAVY-4000 storage containers, 8 Hagan containers, and 39 SAVY-4000 transfer containers. The SAVY-4000 surveillance items ranged in age from 1 year to 5.6 years and the Hagan containers ranged in age from 6.3 years to 17.6 years. The surveillance containers for this year were selected primarily to better understand the extent of corrosion of the stainless steel components of the containers. Accelerated aging studies indicate that themore » O-ring and filter components of the SAVY-4000 will last at least 40 years under LANL storage conditions. However, the observation of corrosion on the inside of SAVY-4000 and Hagan surveillance containers has shifted the emphasis to understanding both the nature and the extent of corrosion on the stainless steel body. The restriction on handling soluble residues greater than 500 grams continued this year, delaying the surveillance of some items that was scheduled in earlier surveillance plans.« less