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EFCOG Electrical Safety Task Group ELECTRICAL SAFETY FOR RADIOLOGICAL CONTROL TECHNICIANS EFCOG Electrical Safety Task Group Module 7.

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Presentation on theme: "EFCOG Electrical Safety Task Group ELECTRICAL SAFETY FOR RADIOLOGICAL CONTROL TECHNICIANS EFCOG Electrical Safety Task Group Module 7."— Presentation transcript:

1 EFCOG Electrical Safety Task Group ELECTRICAL SAFETY FOR RADIOLOGICAL CONTROL TECHNICIANS EFCOG Electrical Safety Task Group Module 7

2 EFCOG Electrical Safety Task Group ELECTRICAL SAFETY FOR RCT’S Batteries Stored on shelves Unprotected with easy access

3 EFCOG Electrical Safety Task Group Exposed Electrical above bleed valves ELECTRICAL SAFETY FOR RCT’S

4 EFCOG Electrical Safety Task Group Shock or Arc Flash Hazard Exposed to operate Switch ELECTRICAL SAFETY FOR RCT’S

5 EFCOG Electrical Safety Task Group Idaho National Laboratory, Radioactive Waste Management Complex On May 10, 2006 an RCT reported feeling an electrical shock on his bare right forearm as he was removing the electrical cord plug of a Continuous Air Monitor (CAM) vacuum pump from around the side and back of an Uninterruptible Power Supply (UPS). He felt what he considered to be an electrical shock when his forearm came into contact with the outside case of the UPS as he removed the 110 volt plug from the receptacle located on the back of the UPS. ELECTRICAL SAFETY FOR RCT’S

6 EFCOG Electrical Safety Task Group RCT RECEIVES SHOCK WHILE STARTING A CAM VACUUM PUMP The RCT inadvertently brushed his right outer forearm against the exposed 110 volt electrical components. As a result, he received a mild electrical shock since he was grounded by the beta CAM metal rack. The RCT reported the incident to his manager and stated that he felt fine. The RCT was escorted to the First Aid stations for observation and was then escorted to the Hanford Environmental Health Foundation (HEHF) for further evaluation.

7 EFCOG Electrical Safety Task Group Unexpected Electrical Hazards RCT RECEIVES SHOCK WHILE STARTING A CAM VACUUM PUMP On 08/23/95, a Radiological Controls Technician (RCT) at T Plant received a mild shock when his hand brushed energized contacts inside an instrument cabinet. He was starting a vacuum pump for a continuous air monitor (CAM) and reached into the cabinet to verify pump operation. He was not injured.

8 EFCOG Electrical Safety Task Group Burned Wire on PCM-2 Personnel Contamination Monitor Causes Facility Evacuation On 12/29/05 after exiting the 105KE Basin and proceeding to the PCM-2, an operator observed that the displays on the monitor were not working and heavy smoke was coming out of the top of the unit. The facility was evacuated and the monitor was unplugged. When Hanford Fire Department (HFD) personnel arrived they found no fire or smoke coming from the monitor.

9 EFCOG Electrical Safety Task Group Burned Wire on PCM-2 Personnel Contamination Monitor Causes Facility Evacuation An Eberline Personnel Contamination Monitor (PCM-2) at the 105KE facility experienced a "loose wire" that caused an electrical short. The short caused wiring insulation to burn, which cause heavy smoke to emanate from the top of the instrument, leading to a facility evacuation.

10 EFCOG Electrical Safety Task Group Instrument Technicians found burned insulation on a six-foot section of wire associated with a photocell on the foot pad. The wire had loosened and sagged over time, eventually pulling free and shorting out. The smoke was preceded by an intermittent failure of the PCM-2 to count continuously when the worker switched from the front count to the back count. Burned Wire on PCM-2 Personnel Contamination Monitor Causes Facility Evacuation

11 EFCOG Electrical Safety Task Group Burned Wire on PCM-2 Personnel Contamination Monitor Causes Facility Evacuation Inspection of other units in the facility found loose/sagging wires on two of three similar monitors, which were subsequently repaired. Eberline, the manufacturer, is aware of this issue and has made available a harness kit for these instruments that will reroute and properly secure the wires away from the foot area of the PCM-2. Owners of PCM-2 Personnel Contamination Monitors should check their units for similar problems.

12 EFCOG Electrical Safety Task Group Unguarded Temporary Light Exposes energized parts. Unexpected Electrical Hazards

13 EFCOG Electrical Safety Task Group Working on or Near Exposed Energized Parts Unqualified Persons, Safe Approach Distance: –Unqualified persons are safe when they maintain a distance from the exposed energized conductors or circuit parts. –The safe approach distance is the Limited Approach Boundary.

14 EFCOG Electrical Safety Task Group LAB 50 to 300 V Exposed Movable Parts 10 feet LAB 50 to 300 V Exposed Fixed Parts 3.5 feet

15 NFPA 70E Standard for Electrical Safety Requirements for Employee Workplaces Table Approach Boundaries to Live Parts for Shock Protection. (All dimensions are distance from live part to employee.) (1)(2)(3)(4)(5) Limited Approach Boundary 1 Restricted Approach Boundary 1 Nominal System Voltage Range, Phase to Phase Exposed Movable Conductor Exposed Fixed Circuit Part Includes Inadvertent Movement Adder Prohibited Approach Boundary 1 0 to 50 Not specified 51 to ft 0 in. 3 ft 6 in. Avoid contact 301 to ft 0 in. 3 ft 6 in. 1 ft 0 in. 0 ft 1 in. 751 to 15 kV 10 ft 0 in. 5 ft 0 in. 2 ft 2 in0 ft 7 in kV to 36 kV 10 ft 0 in. 6 ft 0 in. 2 ft 7 in. 0 ft 10 in 36.1 kV to 46 kV 10 ft 0 in. 8 ft 0 in. 2 ft 9 in. 1 ft 5 in kV to 72.5 kV 10 ft 0 in. 8 ft 0 in. 3 ft 3 in. 2 ft 1 in kV to 121 kV 10 ft 0 in. 8 ft 0 in. 3 ft 2 in. 2 ft 8 in. 138 kV to 145 kV 11 ft 0 in. 10 ft 0 in. 3 ft 7 in. 3 ft 1 in. 161 kV to 169 kV 11 ft 0 in. 11 ft 8 in4 ft 0 in. 3 ft 6 in.

16 EFCOG Electrical Safety Task Group NFPA 70E Standard for Electrical Safety Requirements for Employee Workplaces Table Approach Boundaries to Live Parts for Shock Protection. (All dimensions are distance from live part to employee.) (1)(2)(3)(4)(5) Limited Approach Boundary 1 Restricted Approach Boundary 1 Nominal System Voltage Range, Phase to Phase Exposed Movable Conductor Exposed Fixed Circuit Part Includes Inadvertent Movement Adder Prohibited Approach Boundary kV to 242 kV 13 ft 0 in 5 ft 3 in. 4 ft 9 in. 345 kV to 362 kV 15 ft 4 in. 8 ft 6 in. 8 ft 0 in. 500 kV to 550 kV 19 ft 0 in. 11 ft 3 in. 10 ft 9 in. 765 kV to 800 kV 23 ft 9 in 14 ft 11 in. 14 ft 5 in

17 EFCOG Electrical Safety Task Group Working on or Near Exposed Energized Parts The Flash Protection Boundary is 4 ft. for systems 600 volts and below unless calculated otherwise under engineering supervision.

18 EFCOG Electrical Safety Task Group

19 Temperature And Heat Data Curable burn temperature (1/10sec) 145 °F Cell death temperature (1/10 sec) 205 °F Temperature at arc terminals 35,000 °F Temperature of suns surface 9,000 °F Temperature of burning clothing 1,400 °F Clothing ignition temperature 700 to 1,400 °F Temperature of metal droplets 1,800 °F

20 EFCOG Electrical Safety Task Group Working on or Near Exposed Energized Parts Unqualified Persons, Safe Approach Distance: Unqualified persons must not cross the Flash Protection Boundary unless they are wearing the appropriate PPE and under the supervision of a qualified person.

21 EFCOG Electrical Safety Task Group

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23 CPP1982RollinBreaker CPP 1982 Roll in Breaker

24 EFCOG Electrical Safety Task Group CPP1982RollinBreaker CPP 1982 Roll in Breaker

25 EFCOG Electrical Safety Task Group CPP1982RollinBreaker CPP 1982 Roll in Breaker

26 EFCOG Electrical Safety Task Group Consequences of an Arc-Flash Incident

27 EFCOG Electrical Safety Task Group Consequences of an Arc-Flash Incident Review the list of items shown in slide. In this case the worker wasn’t shocked he was caught in an Arc Flash.

28 EFCOG Electrical Safety Task Group Brookhaven 4/2006 Arc-Flash Incident

29 EFCOG Electrical Safety Task Group Brookhaven 4/2006 Arc-Flash Incident

30 EFCOG Electrical Safety Task Group Brookhaven 4/2006 Arc-Flash Incident

31 EFCOG Electrical Safety Task Group Brookhaven 4/2006 Arc-Flash Incident

32 EFCOG Electrical Safety Task Group Arc Flash Protection Boundary VoltageBoundary up to 750V3 feet 750V to 2kV4 feet 2kV to 15kV16 feet 15kV to 36kV19 feet over 36kVMust be Calculated

33 EFCOG Electrical Safety Task Group Common Electrical Exposures for RCTs

34 EFCOG Electrical Safety Task Group

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36 Hole in Mylar

37 EFCOG Electrical Safety Task Group Thin wires (hard to see)

38 EFCOG Electrical Safety Task Group

39 2100 Volts DC

40 EFCOG Electrical Safety Task Group Possible exposure Eberline CAM

41 EFCOG Electrical Safety Task Group Possible exposure Canberra CAM Possible exposure

42 EFCOG Electrical Safety Task Group Electricity is a part of our daily lives, harness its power but recognize the hazards.


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