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TVA is investigating an incident that occurred Friday, March 16, at Sequoyah Nuclear Plant in which two contract electricians were burned by an ARC flash. According to Malinda Hunter with TVA, an ...

While performing work near a non safety related 6.9kV electrical bus, an arc occurred injuring the two employees. Both personnel were transported to an offsite medical facility for treatment. Neither were contaminated. "The cause of the arc flash is not understood at this time, an accident investigation has been initiated by TVA.

“The cause of the arc flash is not understood at this time; an accident investigation has been initiated by TVA,” the NRC said in its report on the incident. […] An arc flash is the light and heat produced as part of an arc fault — essentially an electrical discharge. Unlike a shock, a person does not have to touch an electrical conductor.

An arc flash happens when electric current flows through an air gap between conductors. TVA has suspended similar work activities across the fleet until they have a full understanding of the cause. The incident occurred away from the reactor and power generating side of the plant, and there are no public or nuclear safety concerns.

Arc Flash is the result of a rapid release of energy due to an arcing fault between a phase bus bar and another phase bus bar, neutral or a ground. ... The cause of the short normally burns away during the initial flash and the arc fault is then sustained by the establishment of a highly-conductive plasma. ... The transition from arc fault to ...

This story was updated March 19, 2018, at 11:59 p.m. with more information. Two contract workers were burned from an arc flash while working near the cooling towers of a Tennessee Valley Authority ...

An arc flash is the sudden release of energy caused by an electric arc. Not only can it result in equipment loss and downtime, it is also one of the leading causes of workplace injury and death. Any company with an electrical system—from large utilities or local hospitals—needs to be aware of potential arc flash hazards and how to address them.

Cause of arc flash and fire at power plant determined. December 6, 2016. KEYWORDS Arc flash / occupational injuries / power plant incident. Reprints ... TVA determines cause of arc flash at Tenn. nuke plant Arc flash caused power issues at Bradley International Airport in Connecticut.

A Field Service Technician- Electrical, working in a switch room, received severe burns when an 11,000 volt arc flash explosion occurred inside a main circuit breaker cubical. Accident Report Results. The investigation was not able to determine the cause of the arc flash. There was no evidence of: Mechanical failure; Electrical supply ...

UPDATE: TVA completes investigation of March "arc flash" that injured 2 workers Two Day and Zimmermann electricians were burned by an arc flash, or electrical explosion, near the cooling towers.

Determine if the potential for a hazardous electrical arc flash exists in equipment that employees work on or near while the equipment is exposed and energized. Identify opportunities to reduce or eliminate as many of the potential arc flash hazards identified in the study as possible.

How do you determine the severity of the arc flash hazard? The severity is defined by the incident energy level. If there is a sticker on the equipment from an arc flash analysis, then the sticker will tell you the incident energy or the minimum level of PPE required.

Additionally, we offer NFPA 70E Arc Flash Safety Training. An Arc Flash is a rapid release of energy during an arcing fault between two electrical conductors. The fault is typically initiated by a dead short between the conductors, the cause of which generally burns away during the initial flash.

Power Systems Engineering . Relay, Protection and Control Schemes ... Arc Flash hazards can cause problems that result in property damage, injury and even loss of life. ... Determines incident energy level at a specific working distance from equipment as per IEEE 1584 Guide for Performing Arc Flash Hazard Calculations.

NORTH CAROLINA - One of the states served by the Tennessee Valley Authority accused the federal utility of being "a public nuisance" for spewing too much pollution in the air. North Carolina Attorney General Roy Cooper sued TVA for what he said are excessive amounts of smog, soot and chemical contaminants emitted from the utility's 11 coal-fired power plants.

An arc flash that burned two contract workers at the Sequoyah Nuclear Plant near Soddy-Daisy, Tennessee was not was not due to any equipment or plant-related issues, according to an investigation by the Tennessee Valley Authority (TVA). Instead, the TVA has concluded that the March 16 incident was caused by improper access and work in an electrical cabinet.