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Title: Early thermal testing of type B radioactive material packages in USA to environments beyond regulatory package thermal test standards

Abstract

Three separate fire test programmes exposing casks beyond the regulatory thermal test requirements were performed by Sandia National Laboratories during the late 1970s and mid 1980s. The results of these test programmes can be used to assist in addressing the adequacy of the regulatory thermal test of fully engulfing exposure at 800°C for 30 min and how that test might relate to real accident thermal environments. The test programmes were undertaken on obsolete and new casks on behalf of the US Department of Energy (DOE), the US Department of Transportation (DOT) and the Japanese Power Reactor and Nuclear Fuel Development Corporation (PNC), currently known as the Japan Atomic Energy Agency. Two of the tests involved exposure of casks in damaged transport vehicles to fully engulfing fires for 72–125 min, and the other test involved four exposures of a cask to torch environments for 30 min. Much of the original documentation regarding these tests and their results is no longer readily available. The documents relating to these tests have been surveyed; this paper presents summaries from this survey of the tests and their results. Specifically, for the pool fire exposures, the temperatures measured in the flames of both exceeded the flamemore » temperature required by the Transport Regulations; yet an obsolete 67 t cask endured 90 min of exposure before evidence of failure was detected, and a new cask endured the 72 min exposure while retaining its containment integrity. For the exposure of a modified obsolete cask to four different torch environments, the integrity of the cask was retained and the relative temperature increases within the cask were well within acceptable limits and well below the values that could be expected if the cask was exposed to the regulatory thermal test. In this paper, a review of these three thermal test programmes, establishes that the two older cask designs and one new cask design have the ability to survive environments that were different from (the torch environments) or more severe than the environment specified by the existing thermal test requirement in the Transport Regulations. Finally, these results can be extrapolated to apply to modern casks that generally have more robust designs as well as better quality assurance applied during the manufacturing process.« less

Authors:
 [1];  [2];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Consultant, Waynesboro, PA (United States)
  3. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1426981
Report Number(s):
SAND2007-0746J
Journal ID: ISSN 1746-5095; 524149
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Packaging, Transport, Storage and Security of Radioactive Material
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Journal ID: ISSN 1746-5095
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; fire (thermal) testing; regulations; safety margins; testing

Citation Formats

Yoshimura, H. R., Pope, R. B., and Kubo, M.. Early thermal testing of type B radioactive material packages in USA to environments beyond regulatory package thermal test standards. United States: N. p., 2007. Web. doi:10.1179/174651007X220177.
Yoshimura, H. R., Pope, R. B., & Kubo, M.. Early thermal testing of type B radioactive material packages in USA to environments beyond regulatory package thermal test standards. United States. doi:10.1179/174651007X220177.
Yoshimura, H. R., Pope, R. B., and Kubo, M.. Fri . "Early thermal testing of type B radioactive material packages in USA to environments beyond regulatory package thermal test standards". United States. doi:10.1179/174651007X220177. https://www.osti.gov/servlets/purl/1426981.
@article{osti_1426981,
title = {Early thermal testing of type B radioactive material packages in USA to environments beyond regulatory package thermal test standards},
author = {Yoshimura, H. R. and Pope, R. B. and Kubo, M.},
abstractNote = {Three separate fire test programmes exposing casks beyond the regulatory thermal test requirements were performed by Sandia National Laboratories during the late 1970s and mid 1980s. The results of these test programmes can be used to assist in addressing the adequacy of the regulatory thermal test of fully engulfing exposure at 800°C for 30 min and how that test might relate to real accident thermal environments. The test programmes were undertaken on obsolete and new casks on behalf of the US Department of Energy (DOE), the US Department of Transportation (DOT) and the Japanese Power Reactor and Nuclear Fuel Development Corporation (PNC), currently known as the Japan Atomic Energy Agency. Two of the tests involved exposure of casks in damaged transport vehicles to fully engulfing fires for 72–125 min, and the other test involved four exposures of a cask to torch environments for 30 min. Much of the original documentation regarding these tests and their results is no longer readily available. The documents relating to these tests have been surveyed; this paper presents summaries from this survey of the tests and their results. Specifically, for the pool fire exposures, the temperatures measured in the flames of both exceeded the flame temperature required by the Transport Regulations; yet an obsolete 67 t cask endured 90 min of exposure before evidence of failure was detected, and a new cask endured the 72 min exposure while retaining its containment integrity. For the exposure of a modified obsolete cask to four different torch environments, the integrity of the cask was retained and the relative temperature increases within the cask were well within acceptable limits and well below the values that could be expected if the cask was exposed to the regulatory thermal test. In this paper, a review of these three thermal test programmes, establishes that the two older cask designs and one new cask design have the ability to survive environments that were different from (the torch environments) or more severe than the environment specified by the existing thermal test requirement in the Transport Regulations. Finally, these results can be extrapolated to apply to modern casks that generally have more robust designs as well as better quality assurance applied during the manufacturing process.},
doi = {10.1179/174651007X220177},
journal = {Packaging, Transport, Storage and Security of Radioactive Material},
number = 2,
volume = 18,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}

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