A predictive model for polyethylene cable insulation degradation in combined thermal and radiation environments

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F18%3AN0000004" target="_blank" >RIV/46356088:_____/18:N0000004 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002" target="_blank" >http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002" target="_blank" >10.1016/j.polymdegradstab.2018.11.002</a>

Result language
angličtina
Original language name
A predictive model for polyethylene cable insulation degradation in combined thermal and radiation environments
Original language description
Reliable prediction of material service lifetime is important for ensuring safe operation in safety-critical systems such as nuclear facilities. Materials in these environments degrade due to several simultaneous effects, most important stressors are heat and radiation. In this work, samples of medium density polyethylene cable insulation were subjected to thermal (110 degrees C) and gamma-radiation stress (500 Gy h(-1)); a combined thermal and radiation test (85 degrees C and 4.5 Gy h(-1)) was also performed. Stability of cable insulation was studied by differential scanning calorimetry and isoconversional kinetic analysis employing a non-Arrhenian temperature function was carried out. From the dependence of residual stability on the degradation dose a predictive model for the cable service life was developed based on the thermal and radiation stress tests; the model validity was verified using the combined stress test results. The model assumes a first-order exponential decay of the residual stability with degradation dose. It allows to predict the degree of insulation damage in wide range of environmental conditions as both temperature and radiation dose effects are considered and radiation dose rate effect is also taken into account.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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