Light Water Reactor Sustainability Program: Evaluation of Localized Cable Test Methods for Nuclear Power Plant Cable Aging Management Programs

Glass, Samuel W.¹  Fifield, Leonard S.¹  Hartman, Trenton S.¹ 

[1] Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

关键词: NUCLEAR POWER PLANTS;    WATER MODERATED REACTORS;    ELECTRIC CABLES;    WATER COOLED REACTORS;    INFRARED THERMOGRAPHY;    NONDESTRUCTIVE TESTING;    CAPACITANCE;    FIELD TESTS;    ULTRASONIC TESTING;    ELONGA;   

DOI  :  10.2172/1258730
RP-ID  :  PNNL--25432
RP-ID  :  M3LW--16OR0404022
PID  :  OSTI ID: 1258730
Others  :  Other: 830403000
Others  :  TRN: US1601519

美国|英语

来源: SciTech Connect

【 摘 要 】

This Pacific Northwest National Laboratory (PNNL) milestone report describes progress to date on the investigation of nondestructive test (NDE) methods focusing particularly on local measurements that provide key indicators of cable aging and damage. The work includes a review of relevant literature as well as hands-on experimental verification of inspection capabilities. As NPPs consider applying for second, or subsequent, license renewal (SLR) to extend their operating period from 60 years to 80 years, it important to understand how the materials installed in plant systems and components will age during that time and develop aging management programs (AMPs) to assure continued safe operation under normal and design basis events (DBE). Normal component and system tests typically confirm the cables can perform their normal operational function. The focus of the cable test program is directed toward the more demanding challenge of assuring the cable function under accident or DBE. Most utilities already have a program associated with their first life extension from 40 to 60 years. Regrettably, there is neither a clear guideline nor a single NDE that can assure cable function and integrity for all cables. Thankfully, however, practical implementation of a broad range of tests allows utilities to develop a practical program that assures cable function to a high degree. The industry has adopted 50% elongation at break (EAB) relative to the un-aged cable condition as the acceptability standard. All tests are benchmarked against the cable EAB test. EAB is a destructive test so the test programs must apply an array of other NDE tests to assure or infer the overall set of cable???s system integrity. These cable NDE programs vary in rigor and methodology. As the industry gains experience with the efficacy of these programs, it is expected that implementation practice will converge to a more common approach. This report addresses the range of local NDE cable tests that are or could be practically implemented in a field test situation. These tests include: visual, infrared thermography, interdigital capacitance, indenter, relaxation time indenter, dynamic mechanical analyzer, infrared/near-infrared spectrometry, ultrasound, and distributed fiber optic temperature measurement.