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FAULT - US NRC

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Last Updated: 24 January 2022

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Nuclear Regulatory Authority Experimental Program to Characterize and Understand High Energy Arcing Fault (HEAF) Phenomena: Basic Arc Test Experimental Data

During the Great East Earthquake in Japan, a High Energy Arcing Fault occurred in a high-voltage switchgear in Unit 1 of the Tohoku Electric Power Company's Onagawa Nuclear Power Plant of the Tohoku Electric Power Company on March 11, 2011. The HEAF's Event Sequence and Investigation Department, Secretariat of the Nuclear Regulation Authority, Onagawa NPP, conducted HEAF experiments by simulating the SWGR HEAF's operating and operational conditions in addition to simulating the HEAF's effects using a "Rocket Fuel Arc Simulator" simulated the HEAF's simulations. To investigate the HEAF event sequence and learn the causes, the Technical Standard and Research Department, HEAF's Simulator's Simulator conducted HEAF's, Secretariat, simulating the National Regulation Authority carried out of the HEAF's Simulating the HEAF's Simulating the HEAF's simulating the HEAF's Simulating the HEAF's Simulator" HEAF's Simulator's Simulator To learn HEAF characteristics, a series of tests of 480 V Motor Control Center and Distribution Panel cabinets were also conducted. Damage similar to the earthquake's was found in the SWGR tests, but less severe. basic arc electrical characteristics and thermal effects using one arc event with arc energies ranging from 0. 6 MJ to 137. 3 MJ was the aim of the experiments conducted in 2016 and described in this article. Except in cases where cable samples were extremely close to the arc, no cable samples ignited. Fire Hazard Analyses' recommendations will be used by international teams to reach consensus conclusions on HEAF conduct, analyze the likelihood for HEAF harm, analyze operating experience, and other HEAF test findings.

Source link: https://www.nrc.gov/reading-rm/doc-collections/nuregs/agreement/ia0470/v2/index.html

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions