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• W3199609329 abstract "This Pacific Northwest National Laboratory (PNNL) milestone report assesses the capability of frequency domain reflectometry (FDR) to determine electrical cable submergence using PNNL’s Accelerated and Real-Time Environmental Nodal Assessment (ARENA) cable/motor test bed. This work includes a review of relevant literature as well as experimental tests. Nuclear power facilities have experienced various electrical cable failures related to water exposure. The current industry response involves actions to de-water cable vaults, manholes, and other cable locations. These efforts require considerable expenditure of resources, which makes it desirable for the industry to have information on cable condition and history regarding their submergence and water exposure (Mantey 2012). Two tests that are gaining favor within the nuclear industry are time-domain reflectometry (TDR) and FDR. These are low-voltage nondestructive tests that can be applied at a cable end. Testing from the cable end is important because local inspection along the cable length is very difficult due to cables being routed within trays, conduits, underground, and through walls. Both TDR and FDR techniques have been shown to locate cable insulation damage due to thermal, radiation, and mechanical damage. FDR measurements are also more sensitive than TDR to temperature changes, low-bend radius bends, and cable contact with various materials, including conductive materials like steel and water. This work evaluates the feasibility to extend FDR testing to characterizing whether an electrical cable is submerged or not and where it may be submerged using PNNL’s ARENA cable/motor test bed. Shielded and unshielded cables were evaluated using FDR conductor-to-conductor for unshielded and conductor-to-shield for shielded cables. Observations and conclusions are as follows: • FDR shows the presence/absence of water with non-shielded cable; • No peaks were observed indicating presence/absence of water with shielded cable; • FDRs were equivalent with and without a motor being connected; • Water detection was frequency dependent – 100MHz was clearer than 1.3GHz; • ARENA test bed enabled quick evaluation." @default.
• W3199609329 created "2021-09-27" @default.
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• W3199609329 date "2021-09-16" @default.
• W3199609329 modified "2023-09-23" @default.
• W3199609329 title "Nondestructive Evaluation (NDE) of Cable Moisture Exposure using Frequency Domain Reflectometry (FDR)" @default.
• W3199609329 doi "https://doi.org/10.2172/1820614" @default.
• W3199609329 hasPublicationYear "2021" @default.
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