Time / Date: 9/24/2023 4:10:13
JSP ID: 1586
Scope of Work: Investigate the cause of the loss of Bank 303 'B' phase to Booster Bend, Booster QD & QF, by switching off the mainline power to the Booster Bend which currently has a Blown Fuse on Secondary Xfmr fault. Possible short in 'B' Phase of the Booster Bend input XFMR
Work Order:
Building: 6
Person in Charge: Erik Kawakami
Lead / Supervisor: Bashaw, Doug
Logged Email: nigel.mesta@lbl.gov
Division: ALS
QEW Level: QEW 2
Modes of Work: Mode 0 - Electrically Safe Work Condition, Mode 1 - LOTO & Zero Voltage Verification
Second Person Requirement: Standby Person
Second Person Identified: Nigel Mesta
List Other Participants:
Affected Persons Notified: Yes
Switching: Hazardous Switching
Panel / Equipment ID: 303A2A1A-Main Disconnect, 323A-CB23, 303A1A-CB4
System Information Review: Single Line Drawing, Panel Schedules, Arc Flash Labels
Control of Hazardous Energy: Complex LOTO (requires LP, CLP, FLP)
Equipment Condition: Properly installed, Properly maintained, All doors and covers closed and fully latched, Not energizing equipment for the first time, or after electrical repair

Sequence of Job Steps

List basic sequence of steps from start to finish.

1. Ensure power supply is off 2. Open the disconnect for the Booster Bend. 3. Check to see if the 'B' phase is returns for Booster QD & QF. 4. If so LOTO out the Booster Bend. 5. Perform ZVV on Booster Bend 6. Check to see if 'B' phase is shorted across the XFMR 7. If phase 'B' does not return to Booster QD & QF contact facilities to request assistance in determining the loss of 'B' phase of Bank 303.

Control of Work Area

Minimum Approach Boundary:
Barricade Tape / Attendant: Warning - Orange

Shock Risk Assessment

System Voltage: 277/480 V ac
Limited Approach Boundary: 42 inches
Restricted Approach Boundary: 12 inches
Will the hands enter the RAB: Yes
Voltage Glove Class:
Will any other part of the body enter the RAB: No

Arc Flash Risk Assessment

Incident Energy: 10 cal/cm2
Arc Flash Boundary: 67
Working Distance: 18 inches
Arc Flash PPE Level: 2
Incident Energy Reduction Measures:

Capacitor Hazards

Capacitor Bus Voltage:
Capacitor total stored energy (joules):
Discharge wait time (minutes):

Emergency Response Plan

Nearest Landline Location: x5457
Emergency Number to Call: x4969
Sufficient cell phone signal? Yes
Clear exit path? Yes
AED Location: Building 80
Fire Extinguisher Location: Building 6
Contact release method available and tested: Voltage gloves

Environmental Conditions

Does the environment present additional hazards that should be addressed?

None

Error Precursors

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

None identified.

PPE Inspections

Safety glasses (ANSI Z87),
Arc-rated clothing (flash suit,
daily wear) including face shield,
balaclava,
hood.,
Hearing protection,
Rubber insulating gloves and leather protectors,
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