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Title: Thermal testing of solid neutron shielding materials

Two legal-weight truck casks the GA-4 and GA-9, will carry four PWR and nine BWR spent fuel assemblies, respectively. Each cask has a solid neutron shielding material separating the steel body and the outer steel skin. In the thermal accident specified by NRC regulations in 10CFR Part 71, the cask is subjected to an 800[degree]C environment for 30 minutes. The neutron shield need not perform any shielding function during or after the thermal accident, but its behavior must not compromise the ability of the cask to contain the radioactive contents. In May-June 1989 the first series of full-scale thermal tests was performed on three shielding materials: Bisco Products NS-4-FR, and Reactor Experiments RX-201 and RX-207. The tests are described in Thermal Testing of Solid Neutron Shielding Materials, GA-AL 9897, R. H. Boonstra, General Atomics (1990), and demonstrated the acceptability of these materials in a thermal accident. Subsequent design changes to the cask rendered these materials unattractive in terms of weight or adequate service temperature margin. For the second test series, a material specification was developed for a polypropylene based neutron shield with a softening point of at least 280[degree]F. The neutron shield materials tested were boronated (0.8--4.5%) polymers (polypropylene, HDPE,more » NS-4). The Envirotech and Bisco materials are not polypropylene, but were tested as potential backup materials in the event that a satisfactory polypropylene could not be found.« less
Authors:
Publication Date:
OSTI Identifier:
7016274
Report Number(s):
GA-A-20770; EGG-M--92433; CONF-920905--40
ON: DE93001946; TRN: 92-038129
DOE Contract Number:
AC07-88ID12698
Resource Type:
Conference
Resource Relation:
Conference: 10. international symposium on the packaging and transportation of radioactive materials: PATRAM '92, Yokohama (Japan), 13-18 Sep 1992
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; SHIELDING MATERIALS; THERMAL TESTING; SPENT FUEL CASKS; BORON ADDITIONS; POLYETHYLENES; POLYPROPYLENE; TEMPERATURE RANGE 1000-4000 K; ALLOYS; BORON ALLOYS; CASKS; CONTAINERS; MATERIALS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; ORGANIC COMPOUNDS; ORGANIC POLYMERS; POLYMERS; POLYOLEFINS; TEMPERATURE RANGE; TESTING 420204* -- Engineering-- Shipping Containers; 360604 -- Materials-- Corrosion, Erosion, & Degradation