Time / Date: 12/6/2023 15:29:42
JSP ID: 1935
Scope of Work: Testing and troubleshooting of dewar heater
Work Order:
Building: 58
Person in Charge: Ohmar Sowle
Lead / Supervisor: Other
Logged Email: oasowle@lbl.gov
Division: Other
QEW Level: QEW 1
Modes of Work: Mode 2 - Energized Diagnostics, Testing and Troubleshooting, Visual Inspection
Second Person Requirement: Not Required
Second Person Identified: None
List Other Participants: None
Affected Persons Notified: Yes
Switching: Non-Hazardous Switching
Panel / Equipment ID: Vendor owned helium dewar with heater
System Information Review: None - plug and cord
Control of Hazardous Energy: LOTO Not Required (Mode 2 or 3 only)
Equipment Condition:

Sequence of Job Steps

List basic sequence of steps from start to finish.

JSP, danger tape, measure voltage from dewar to switch and switch housing with switch in all positions, measure the current to heater in all positions, measure current with 3k resistance from dewar to switch

Control of Work Area

Minimum Approach Boundary: 42
Barricade Tape / Attendant: Danger - Red

Shock Risk Assessment

System Voltage: 120 Vac
Limited Approach Boundary: 42 inches
Restricted Approach Boundary: 3 inches
Will the hands enter the RAB: No
Voltage Glove Class: Not Required
Will any other part of the body enter the RAB: No

Arc Flash Risk Assessment

Incident Energy: Plug and cord 120v cal/cm2
Arc Flash Boundary: Na
Working Distance: No Arc Flash Hazard Present
Arc Flash PPE Level: Minimum PPE for Electrical Work
Incident Energy Reduction Measures: Not Required

Capacitor Hazards

Capacitor Bus Voltage: None
Capacitor total stored energy (joules): 0
Discharge wait time (minutes): 0

Emergency Response Plan

Nearest Landline Location: Offices at the endo of 58
Emergency Number to Call: 7911
Sufficient cell phone signal? Yes
Clear exit path? Yes
AED Location: Offices at end of 58
Fire Extinguisher Location: Wall by door
Contact release method available and tested: Pallet nearby

Environmental Conditions

Does the environment present additional hazards that should be addressed?

Wet location

Error Precursors

Task Demands:
Work Environment:
Individual Capabilities:
Human Nature:
Error Precursor Mitigations:

None

PPE Inspections

Safety glasses (ANSI Z87),
Arc-rated clothing (flash suit,
daily wear) including face shield,
balaclava,
hood.,
Non-melting footwear that fully covers the feet,
Removal of conductive articles,
Insulated tools,
Multimeter and other electrical test instruments

Notes / Other

Perform Job Breifing

PIC Conducts the Job Briefing. Cover all the contents of the Job Safety Plan.

A Job Briefing at a minimum must include:
  1. Detailed Scope of Work
  2. Shock and arc flash hazards for each task
  3. Controls to mitigate the hazards (procedures, precautions, energy source controls, PPE requirements)
  4. Work area controls (barricades, signs, attendants)
  5. Emergency Response Plan

Rev 2023.08.22.1
Form Content and Feedback Contact: Michael Rose -- mvr@lbl.gov