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Title: Analysis of simultaneous thermal/gamma radiation aging of cross-linked polyethylene (XLPE) insulation—interim status report

Abstract

Cross-linked polyethylene (XLPE) is the most common cable insulation found in nuclear containment, and is therefore a priority material for investigation of long term aging effect from elevated temperature combined with gamma radiation exposure. Prior work has identified the possibility of anomalous aging behavior in XLPE such as the inverse temperature effect in which radiation exposure is more damaging at lower temperatures than at higher temperatures. We explored simultaneous aging of XLPE insulation from modern Firewall® III nuclear cables at 60, 90, and 115 °C, at gamma dose rates from 116 to 540 Gy/h, for exposure periods up to 25 d. XLPE samples exposed in this way were characterized using the percent gel and uptake factor method. For the conditions and material examine, degradation behavior was seen to track proportionally with increasing temperature, rather than to exhibit greater degradation at lower temperatures. Ongoing work including similar aging at 25 °C and characterization of the XLPE samples using other methods will further elucidate these initial results

Authors:
 [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1400348
Report Number(s):
PNNL-26554
830403000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; cable aging inspection; inverse temperature effect; XLPE

Citation Formats

Fifield, Leonard S., and Correa, Miguel. Analysis of simultaneous thermal/gamma radiation aging of cross-linked polyethylene (XLPE) insulation—interim status report. United States: N. p., 2017. Web. doi:10.2172/1400348.
Fifield, Leonard S., & Correa, Miguel. Analysis of simultaneous thermal/gamma radiation aging of cross-linked polyethylene (XLPE) insulation—interim status report. United States. doi:10.2172/1400348.
Fifield, Leonard S., and Correa, Miguel. Fri . "Analysis of simultaneous thermal/gamma radiation aging of cross-linked polyethylene (XLPE) insulation—interim status report". United States. doi:10.2172/1400348. https://www.osti.gov/servlets/purl/1400348.
@article{osti_1400348,
title = {Analysis of simultaneous thermal/gamma radiation aging of cross-linked polyethylene (XLPE) insulation—interim status report},
author = {Fifield, Leonard S. and Correa, Miguel},
abstractNote = {Cross-linked polyethylene (XLPE) is the most common cable insulation found in nuclear containment, and is therefore a priority material for investigation of long term aging effect from elevated temperature combined with gamma radiation exposure. Prior work has identified the possibility of anomalous aging behavior in XLPE such as the inverse temperature effect in which radiation exposure is more damaging at lower temperatures than at higher temperatures. We explored simultaneous aging of XLPE insulation from modern Firewall® III nuclear cables at 60, 90, and 115 °C, at gamma dose rates from 116 to 540 Gy/h, for exposure periods up to 25 d. XLPE samples exposed in this way were characterized using the percent gel and uptake factor method. For the conditions and material examine, degradation behavior was seen to track proportionally with increasing temperature, rather than to exhibit greater degradation at lower temperatures. Ongoing work including similar aging at 25 °C and characterization of the XLPE samples using other methods will further elucidate these initial results},
doi = {10.2172/1400348},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jun 16 00:00:00 EDT 2017},
month = {Fri Jun 16 00:00:00 EDT 2017}
}

Technical Report:

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