How Nuclear Plants Control Contamination Through Protective Clothing Programs

Protective clothing is one of the most visible elements of a nuclear facility's radiation protection program. Workers entering contaminated or potentially contaminated areas may wear coveralls, hoods, gloves, shoe covers, protective footwear, respiratory equipment, and other personal protective equipment depending on the work being performed.

But the clothing itself is only part of the system.

An effective nuclear protective clothing program combines hazard assessment, properly selected garments, controlled dress-out practices, contamination boundaries, careful work practices, controlled removal of PPE, personnel monitoring, garment collection, laundering or disposal, inspection, and inventory management.

When these elements work together, protective clothing provides an important barrier between radioactive contamination and the worker while helping prevent contamination from spreading beyond controlled areas.

Understanding that complete system is critical for radiation protection personnel, outage planners, safety managers, operations teams, and procurement professionals responsible for nuclear worker protection.

Contamination and Radiation Exposure Are Not the Same Thing

Before examining protective clothing programs, it is important to understand the difference between radioactive contamination and radiation exposure.

Radioactive contamination occurs when radioactive material is deposited on a person, object, surface, or within an area.

Radiation exposure refers to exposure to the ionizing radiation emitted by radioactive material or another radiation source.

Anti-contamination clothing primarily provides a barrier intended to help keep radioactive material from contacting a worker's skin or personal clothing. Conventional protective clothing should not be confused with shielding against penetrating ionizing radiation.

This distinction is discussed in greater detail in our Radiation Protection PPE: Myths, Facts, and Best Practices guide.

The NRC also provides access to a radiological PPE selection and use procedure that addresses the selection, inspection, donning, and removal of anti-contamination clothing.

What Is a Nuclear Protective Clothing Program?

A protective clothing program is much more than a stockroom filled with coveralls.

A complete program considers the entire lifecycle of protective equipment:

• Identifying the radiological and industrial hazards
• Selecting appropriate protective clothing
• Providing the correct garment sizes
• Inspecting PPE before use
• Properly donning the protective ensemble
• Controlling work within contaminated areas
• Removing PPE without transferring contamination
• Monitoring workers as they leave controlled areas
• Collecting used garments
• Laundering, processing, or disposing of garments
• Inspecting reusable garments before returning them to service
• Maintaining enough inventory to support routine work and outages

The Electric Power Research Institute has historically recognized this broader program-management need. The EPRI Guide to Managing Nuclear Utility Protective Clothing Programs, available through the U.S. Department of Energy's Office of Scientific and Technical Information, was developed to address both the operational and economic considerations involved in managing protective clothing for radiation workers.

Step 1: Identify the Contamination Hazard

PPE selection should begin with the conditions associated with the work rather than with a predetermined garment.

Radiation protection personnel may consider factors such as:

• Known or potential surface contamination
• Potential for airborne radioactive material
• Type of work being performed
• Work location
• Expected contact with contaminated equipment or surfaces
• Other industrial hazards
• Heat burden
• Duration of the work

The protective clothing ensemble can then be selected according to the facility's approved radiation protection program and radiological work controls.

Step 2: Build the Protective Clothing Ensemble

A typical anti-contamination clothing ensemble can contain several components.

Depending on the work, those components may include:

• Protective coveralls
• Hoods
• Glove liners
• Outer gloves
• Shoe covers
• Rubber protective footwear
• Safety glasses
• Hard hats
• Respiratory protection where required

ShopUniTech's Protective Clothing collection includes disposable and reusable garments, gloves, shoe covers, scrubs, and other protective equipment used in nuclear, industrial, and controlled environments.

The specific combination should always match the approved requirements for the job. More clothing does not automatically mean better protection, particularly when unnecessary layers create additional heat burden or interfere with worker mobility.

Step 3: Inspect Protective Clothing Before Use

Protective clothing needs to be in acceptable condition before it can perform its intended function.

Depending on the type of garment, workers or designated personnel may need to check for:

• Tears
• Holes
• Damaged seams
• Broken closures
• Worn elastic
• Fabric degradation
• Other conditions that could compromise protection

Reusable clothing programs make inspection especially important because garments may undergo repeated work and laundering cycles.

Damaged or unacceptable garments should be handled according to applicable site and garment-management procedures rather than simply returned to circulation.

Step 4: Use Controlled Dress-Out Procedures

How a worker puts on protective clothing can be just as important as which clothing is selected.

A nuclear dress-out process is designed to create an appropriate protective barrier while maintaining compatibility among the different PPE components.

The specific sequence varies according to the facility, job, and protective ensemble. Workers should follow the applicable radiological work requirements rather than relying on a generic sequence.

A dress-out process may address:

• Shoe covers
• Glove liners
• Coveralls
• Dosimetry
• Protective footwear
• Outer gloves
• Hoods
• Hard hats

The objective is to make sure the protective system is complete before entry into the controlled work area.

Step 5: Establish Contamination Boundaries

Protective clothing becomes more effective when it is combined with clearly established contamination controls.

Facilities may use controlled boundaries, step-off areas, postings, physical barriers, designated entry and exit points, and monitoring locations to help prevent radioactive material from moving into clean areas.

Personnel and equipment movement through those boundaries should follow the site's approved radiological controls.

The NRC-hosted Use of Protective Clothing in Contaminated Areas procedure illustrates this systematic approach by addressing protective clothing selection, work in contaminated areas, clothing removal, and personnel surveys when workers exit.

Step 6: Control Worker Practices Inside the Area

Protective clothing creates a barrier, but worker behavior remains important.

During radiological work, employees should follow the applicable site procedures and work controls intended to prevent unnecessary contamination.

Depending on the job, that may include practices involving:

• Handling contaminated tools and equipment
• Avoiding unnecessary contact with contaminated surfaces
• Maintaining established contamination boundaries
• Changing gloves when required
• Managing potentially contaminated materials
• Following radiological work permit requirements

Protective clothing does not eliminate the need for disciplined contamination-control practices.

Step 7: Pay Particular Attention to Hands and Feet

Hands and footwear deserve special consideration because both frequently contact the work environment.

Workers use their hands to handle tools, equipment, valves, components, materials, scaffolding, and work surfaces. Footwear continuously contacts floors and walking surfaces.

That creates potential pathways for contamination transfer.

Depending on site requirements and hazards, glove systems may include liners, disposable gloves, reusable rubber gloves, or industrial protective gloves.

Foot protection may include disposable shoe covers, reusable protective footwear, or multiple layers depending on the work.

ShopUniTech offers a range of protective shoe covers and contamination-control footwear, including disposable nonskid options and reusable footwear for industrial and nuclear applications.

Step 8: Remove Protective Clothing Carefully

Doffing is one of the most important parts of contamination control.

The outside of a glove, coverall, hood, shoe cover, or other PPE component may have contacted radioactive contamination during the work.

Removing that equipment carelessly can potentially transfer contamination to:

• The worker's skin
• Personal clothing
• Clean surfaces
• Other equipment
• Areas outside the contamination boundary

Controlled PPE removal procedures are intended to minimize that potential transfer.

Methods can include carefully removing gloves without contacting the contaminated outer surface, controlled removal of hoods and garments, removal of protective footwear at designated boundaries, and stepping from controlled areas into cleaner areas according to site procedure.

Workers should always follow their facility's approved sequence because dress-out and undress requirements vary with the job and contamination conditions.

Step 9: Monitor Personnel After Removing PPE

Protective clothing does not eliminate the need for radiological monitoring.

Personnel monitoring provides an important verification step after work has been completed and protective equipment has been removed.

Depending on the facility and work activity, personnel may be required to use whole-body contamination monitors, portal monitors, hand-and-foot monitors, frisking equipment, or other approved monitoring methods.

If contamination is identified, facility procedures determine the appropriate response, which can include additional surveys, decontamination, evaluation, and documentation.

The objective is to identify contamination before a worker leaves the controlled environment and potentially spreads radioactive material into unrestricted areas.

Step 10: Control Used Protective Clothing

Once PPE has been removed, contaminated or potentially contaminated garments still need to be controlled.

Reusable protective garments may be placed into designated laundry containers or bags for radiological processing.

Disposable PPE may need to be managed through the facility's applicable radioactive-material or waste procedures.

Keeping those streams properly controlled prevents used PPE from becoming a pathway for contamination spread.

Disposable vs. Reusable Protective Clothing

Nuclear facilities can use reusable garments, disposable garments, or a hybrid system depending on operational needs.

Each approach has advantages and trade-offs.

Disposable Protective Clothing

Potential considerations include:

• No laundering requirement
• Convenient replacement
• Storage requirements
• Continuous replenishment
• Waste generation
• Garment comfort
• Total lifecycle cost

Reusable Protective Clothing

Potential considerations include:

• Repeated use
• Laundering requirements
• Inspection and repair
• Garment tracking
• Inventory management
• Worker comfort
• Potential reduction in disposable waste

UniTech's nuclear protective clothing programs include reusable clothing, garment leasing, hybrid programs, onsite clothing management, and radiological laundering. More information is available through UniTech's Nuclear Protective Clothing programs.

The Role of Radiological Laundry

A reusable protective clothing program depends on controlled processing after garments leave the work site.

Radiological laundry is not simply conventional commercial laundering.

A controlled program can involve:

• Receiving potentially contaminated garments
• Radiological surveys
• Sorting garments
• Segregating garment types
• Controlled washing processes
• Contamination monitoring
• Garment inspection
• Returning acceptable garments to service

These controls help make reusable clothing part of an ongoing contamination-control system rather than a one-time PPE purchase.

Segregation Helps Control Cross-Contamination

Segregation is an important principle in radiological garment processing.

Potentially contaminated garments should not simply be mixed together without consideration for garment type, contamination conditions, and processing requirements.

Controlled laundry programs may segregate clothing based on factors such as:

• Garment material
• Protective clothing type
• Rubber versus fabric items
• Flame-resistant garments
• Contamination or radiation levels
• Customer or facility requirements

Proper segregation can reduce cross-contamination while allowing different garment types to receive the processing appropriate for their construction and condition.

Protective Clothing Programs and Radioactive Waste Reduction

Garment strategy can also influence waste generation.

A disposable protective garment that becomes contaminated may ultimately enter the facility's waste stream. A reusable garment that can be successfully processed, monitored, inspected, and returned to service may avoid becoming waste after a single use.

That does not mean reusable clothing is automatically appropriate for every job.

The decision should consider contamination conditions, required protection, garment performance, laundering capability, worker comfort, operational requirements, and total program cost.

The more useful procurement question is often not simply, "What does this coverall cost?" but, "What is the total lifecycle cost and operational impact of this protective clothing program?"

Heat Stress Must Be Part of the Program

Anti-contamination clothing can create secondary safety considerations, especially thermal burden.

Workers may simultaneously wear:

• Full-body coveralls
• Protective hoods
• Multiple glove layers
• Protective footwear
• Respiratory equipment

Physical activity combined with protective clothing can reduce the body's ability to dissipate heat effectively.

Garment selection should therefore consider protection and worker comfort together.

For a more detailed discussion, see our guide to Heat Stress Management in Protective Clothing.

Protective Clothing Programs During Refueling Outages

Refueling outages put protective clothing programs under particularly heavy demand.

Large numbers of supplemental workers may perform maintenance, inspection, repair, modification, decontamination, and other activities over a compressed period.

This can dramatically increase demand for:

• Coveralls
• Hoods
• Gloves
• Shoe covers
• Protective footwear
• Laundry processing
• Garment distribution
• Replacement inventory

Inventory planning becomes a contamination-control issue as well as a procurement issue. If properly sized approved garments are not available when needed, work can be delayed or PPE programs can become more difficult to manage.

For additional outage planning considerations, read our PPE Requirements for Nuclear Refueling Outages: A Complete Guide.

Why Garment Fit Matters

Protective garments must fit workers properly.

Oversized garments can create excess material that interferes with movement. Undersized garments may restrict mobility or place additional strain on seams and closures.

Proper sizing also affects worker comfort, which becomes increasingly important during long work periods and jobs involving several layers of PPE.

A successful clothing program therefore needs the correct inventory mix, not merely a large total number of garments.

Training Connects the Entire Program

Even a well-designed protective clothing system depends on the worker understanding how it functions.

Training should support the requirements of the facility's radiation protection program and may address:

• Why protective clothing is required
• What hazards the clothing addresses
• What protective clothing does not protect against
• How PPE should be inspected
• Correct dress-out procedures
• Work practices within contaminated areas
• Glove-change requirements
• Controlled undress procedures
• Personnel monitoring requirements
• What to do if contamination is detected

Understanding the reason for each step helps transform contamination control from a checklist into a system workers can consistently apply.

A Nuclear Protective Clothing Program Checklist

Radiation protection, safety, outage, and procurement teams can use the following questions when reviewing a protective clothing program:

• Are contamination hazards evaluated before PPE is selected?
• Are protective clothing requirements appropriate for each work activity?
• Are approved garment types clearly defined?
• Are sufficient quantities and sizes available?
• Are garments inspected before use?
• Are dress-out procedures clearly established?
• Are entry and exit boundaries controlled?
• Are workers trained in contamination-control practices?
• Are gloves and footwear appropriate for the hazards?
• Are PPE components compatible with one another?
• Are controlled doffing procedures established?
• Is personnel contamination monitoring performed as required?
• Are used garments properly collected?
• Are reusable garments processed through a controlled radiological laundry program?
• Are processed garments inspected before returning to service?
• Is sufficient contingency inventory available for outages and unexpected demand?
• Are heat-stress considerations included in PPE planning?
• Are garment usage, replacement, laundering, and waste costs evaluated as a complete program?

Conclusion: Protective Clothing Works as Part of a System

Nuclear contamination control does not depend on a single coverall, glove, hood, or shoe cover.

It depends on a coordinated protective clothing program.

The process begins with identifying the contamination hazard and selecting appropriate PPE. It continues through inspection, controlled dress-out, disciplined work practices, careful doffing, personnel monitoring, garment collection, radiological processing, inspection, and inventory management.

Each step helps maintain separation between contaminated and clean environments.

When nuclear facilities treat protective clothing as a complete lifecycle program rather than simply a PPE purchase, they can strengthen contamination control while also addressing worker comfort, operational efficiency, garment availability, waste generation, and total program cost.

That is what turns protective clothing from individual pieces of equipment into an effective contamination-control system.

Additional Nuclear Contamination-Control Resources

• NRC-Hosted Selection and Use of Personnel Protective Equipment Procedure
• NRC-Hosted Use of Protective Clothing in Contaminated Areas Procedure
• EPRI Guide to Managing Nuclear Utility Protective Clothing Programs
• UniTech Nuclear Protective Clothing Programs

This article provides general educational information and is not a substitute for a facility's radiation protection program, radiological work permits, approved procedures, hazard assessments, license conditions, manufacturer instructions, or applicable regulatory requirements.