Nuclear power plant accident simulations of gasket materials under simultaneous radiation plus thermal plus mechanical stress conditions Page: 4 of 46
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Unlimited Release Category UC-523
Printed July, 1997
NUCLEAR POWER PLANT ACCIDENT SIMULATIONS OF GASKET
MATERIALS UNDER SIMULTANEOUS RADIATION PLUS THERMAL PLUS
MECHANICAL STRESS CONDITIONS
Kenneth T. Gillen and G. Michael Malone
Materials Aging and Reliability: Bulk Properties Department
Sandia National Laboratories
P. O. Box 5800
Albuquerque, NM 89185-1407 USA
In order to probe the response of silicone door gasket materials to a postulated severe
accident in an Italian nuclear power plant, compression stress relaxation (CSR) and
compression set (CS) measurements were conducted under combined radiation
(approximately 6 kGy/h) and temperature (up to 230*C) conditions. By making some
reasonable initial assumptions, simplified constant temperature and dose rates were
derived that should do a reasonable job of simulating the complex environments for
worst-case severe events that combine overall aging plus accidents. Further
simplification coupled with thermal-only experiments allowed us to derive thermal-only
conditions that can be used to achieve CSR and CS responses similar to those expected
from the combined environments that are more difficult to simulate. Although the
thermal-only simulations should lead to sealing forces similar to those expected during a
severe accident, modulus and density results indicate that significant differences in
underlying chemistry are expected for the thermal-only and the combined environment
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Gillen, K.T. & Malone, G.M. Nuclear power plant accident simulations of gasket materials under simultaneous radiation plus thermal plus mechanical stress conditions, report, July 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc690316/m1/4/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.