Lockout/Tagout, PPE Selection, and First Aid/CPR

Why This Lesson Matters

Nuclear power plants are among the safest industrial workplaces in the country, and that record is no accident. It is the direct result of disciplined safety systems that every technician must internalize before touching any plant equipment. Three of the most critical are Lockout/Tagout (LOTO), Personal Protective Equipment (PPE), and First Aid/CPR. Mastery of these skills is required before you can legally work in a controlled area and is tested in both the NRC Non-Licensed Operator preparation and the NUCP Uniform Curriculum.

Lockout/Tagout (LOTO)

Lockout/Tagout is the federally mandated procedure for controlling hazardous energy during servicing and maintenance of equipment. The governing standard is OSHA 29 CFR 1910.147, The Control of Hazardous Energy. Hazardous energy includes electrical, pneumatic, hydraulic, mechanical, thermal, chemical, and gravitational stored energy—all of which exist in a nuclear plant.

When a worker performs LOTO incorrectly or skips it entirely, unexpected energy release can cause electrocution, crush injuries, or chemical burns. In the nuclear environment, improperly isolated systems can also result in radiological exposure or loss of coolant events.

The Six-Step LOTO Sequence

Step 1 – Notify affected employees. Inform all workers in the area that equipment is being shut down and why. Communication prevents anyone from inadvertently restarting the system.

Step 2 – Identify all energy sources. Review the written LOTO procedure or equipment diagram. On a nuclear plant pump, for example, you may have 480-volt electrical supply, instrument air (pneumatic), hydraulic actuators, and stored thermal energy in process fluid—each requires its own isolation point.

Step 3 – Shut down the equipment. Use the normal stopping procedure. Do not isolate energy while the machine is running if it can be shut down first.

Step 4 – Isolate all energy sources. Open every breaker, valve, or disconnect identified in Step 2. This is the physical act of removing energy from the system.

Step 5 – Apply lockout/tagout devices. Each authorized employee places their personal lock on each energy-isolating device. A tag is attached listing the employee's name, date, and reason. In a multi-energy situation, hasp devices allow multiple locks on a single isolating point. Tags alone are used only when a lock physically cannot be applied.

Step 6 – Verify zero energy (try-out). This step is non-negotiable. Attempt to start the equipment using its normal controls. Test electrical circuits with an approved meter. Bleed pneumatic and hydraulic lines and confirm pressure is zero. Only after verified zero energy is it safe to begin work.

Restoration follows the reverse order: remove tools, reinstall guards, remove LOTO devices (only by the person who applied them), notify affected employees, and restore energy.

> Critical rule: Skipping or shortcutting the verification step is an automatic program failure in this course—and in a real plant, it can be fatal.

PPE Selection in the Nuclear Environment

PPE is selected based on the specific hazard, not habit. OSHA and plant technical specifications define minimum requirements; nuclear plants often exceed them.

Electrical work requires voltage-rated insulating gloves (tested to the voltage class of the circuit), arc-flash rated face shield and clothing (arc rating matched to the incident energy calculation for that panel), safety glasses underneath the face shield, and a hard hat rated for electrical use (Class E).

Chemical contact risk (acids, bases, or hazardous process chemicals) requires chemical-resistant gloves matched to the specific chemical using a compatibility chart, chemical splash goggles (not just safety glasses), and potentially a face shield and chemical-resistant apron or coveralls. The Safety Data Sheet (SDS) for the chemical specifies the required protection.

Radiologically Controlled Areas (RCAs) use a layered approach. Entry requirements are posted at the RCA boundary and depend on dose rate and contamination levels. Typical requirements include anti-contamination clothing ("anti-C" coveralls and booties), a second pair of gloves, respiratory protection if airborne contamination is possible, and a dosimeter (electronic personal dosimeter and/or a thermoluminescent dosimeter). Hard hats and safety glasses are also required if work involves overhead hazards or flying debris.

Always read the posted radiological work permit (RWP) and the job hazard analysis (JHA) before entering any controlled area. When in doubt, ask your radiation protection (RP) technician—that is their job.

First Aid and CPR in an Industrial Setting

In a large plant, emergency medical services may take several minutes to arrive. Every technician must be capable of providing immediate care. The American Heart Association (AHA) and American Red Cross (ARC) Heartsaver programs teach exactly the skills needed.

Adult CPR sequence (hands-only emphasis): Check scene safety → check responsiveness → call for help / activate EMS → check for pulse and breathing (no more than 10 seconds) → begin chest compressions at a rate of 100–120 per minute, depth of at least 2 inches → deliver rescue breaths if trained and equipped → use AED as soon as available.

Two-rescuer CPR allows one rescuer to perform compressions while the second manages the airway and AED. Rescuers switch roles approximately every two minutes to prevent fatigue from degrading compression quality.

AED use: Power on → apply pads as illustrated → clear and analyze → deliver shock if advised → immediately resume CPR.

Hemorrhage control: Apply direct pressure with a clean dressing. For severe limb bleeding, a tourniquet applied 2–3 inches above the wound and tightened until bleeding stops is appropriate. Note the time applied and do not remove in the field.

First aid certification through AHA or ARC Heartsaver is a prerequisite for most nuclear plant site access badge programs and is required to complete this course.