Contractor Injury – Electrical Arc Flash Washington Site What Happened? On 3/15 contractor installed a 15 HP starter into a live 480V MCC Wore hard hat and safety glasses and used a regular screwdriver w/o an insulated shaft Received 1st and 2nd degree burns to face and both hands Fortunately, did not receive electrical shock or eye damage Contractor expects to recover fully with only minor scarring of hands 11/17/2018

Contractor Injury – Electrical Arc Flash Washington Site Background Experienced Journeyman with 20+ yrs. exp., Very familiar with site ~ 10 yrs. experience Trained on required PPE for Hazard Risk Category 3 electrical tasks Insertion of motor starter into live MCC a common practice at many sites 11/17/2018

Contractor Injury – Electrical Arc Flash Washington Site Preliminary Investigation Results Root/Contributing Causes Contractor Personal Performance - failed to utilize proper PPE and proper tool (V-rated gloves, V-rated screwdriver, FR coveralls, flash suit hood, etc.) Site Procedures did not not adequately address guidelines for working on electrically energized equipment 11/17/2018

Contractor Injury – Electrical Arc Flash Washington Site Preliminary Investigation Results Corrective Actions to be finalized after receiving final safety report from electrical contractor. Recommendations Sites should critically review procedures for working on energized electrical equipment to ensure necessary guidance, approvals,and oversight exist. (See NFPA 70E, Article 130 and draft procedure from Wyandotte, WYN032.043) 11/17/2018

MCC#2 – Contains total of 66 motor starters. Shutdown of entire MCC affects 4 of 7 reactor systems and other critical tank farm equipment 11/17/2018

3 phase, 480V starter for 15 HP agitator motor . Starter was removed to drill holes for future mounting of control relay 11/17/2018

Exposed 480 V buss bar with starter removed 11/17/2018

Incident occurred while tightening this hold-down screw from the front Rear view of starter. Incident occurred while tightening this hold-down screw from the front 11/17/2018

Uninsulated screw driver contacted electrically energized wire 11/17/2018

Signs of melting at screwdriver tip Signs of melting at screwdriver tip. Temperature likely exceeded 2500 °F from the front 11/17/2018

Soot residue on helmet and safety glasses 11/17/2018

PPE requirements poster located in MCC. Approx. 4 feet from starter 11/17/2018

Located in MCC. Approx. 10 feet from starter Duffle bags containing required PPE: V-rated gloves, FR coveralls, flash suit hood, etc. Located in MCC. Approx. 10 feet from starter 11/17/2018