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Radiation Shielding Swinging Neutron Doors

RPP’s swing radiation shielding doors (neutron doors) are constructed with ¼" thick A-36 steel face plates. A-36 steel flat bars are used for the stiles and the reinforcement inside the door (See details.) Flat bar thicknesses for the stiles and reinforcement are dictated by the core of the door. The core of the door will consist of the shielding requirements (typically lead and borated polyethylene) as determined by a licensed physicist. We can also design the door with extra space inside for future upgrades which may require more shielding. The door finish is completed in the factory with a paint grade primer. RPP offers safety features for radiation shielding doors (neutron doors) such as motion sensors, pressure sensitive tape, and battery backup.

Our RPP designed frames for neutron swing door systems are constructed with ¼" thick A-36 steel. Five gussets at ¼" thick and five pieces of bent flat bar steel at ½" thick are welded to the jambs (see detail-link). This reinforcement ensures longevity for the radiation shielding door (neutron door) and prevents misalignment between each of the hinges. The gussets have a dowel system to allow the concrete to set securely to the frame when poured. This RPP designed framing system is the most durable available.

RPP’s automatic openers for radiation shielding doors (neutron doors) are the most reliable and well-built in the industry. Our vendor’s vast experience of what works and what does not is based upon years of field experience. The 1502 series electric operators are specifically designed to eliminate the problems that other manufacturers have had with their designs. The units are built with the very best industrial components on the market today. Specific issues like output shaft failure, limit switch sensitivity, torque output, torque output control, operator mechanical drive protection, and door inertia control are all diminished or eliminated by design. The electric operators require a 120 VAC power source that we convert to 90 VDC. The advantage of DC is that we can better control the operation of the door operator. RPP will make final adjustments to the door but all conduit work and electrical work will be completed by others. See more details on swing door operators.

RPP’s radiation shielding doors (neutron doors) and door frames are customizable to meet both your new construction requirements and you retro fit requirements.

For frames set in concrete, the frames will be shipped to the jobsite with detailed specifications to be installed by an independent contractor. Retro-fit frames will be installed by RPP.

Radiation Shielding Swinging Door Operator Details

1. The DC drive has several features that allow us the ability to fine tune the drive characteristics, it has separated adjustments for acceleration, deceleration, travel speed, and creep speed. All of which are field adjustable after the radiation shielding door (neutron door) and operator are installed.
2. The electric operators are power open and power closed. Conventional electric operators are power open and hydraulically controlled spring power closed. Radiation shielding applications are to demanding for conventional style electric operators.
3. The operators are equipped with 4 sets of limit switches. Full open, full close, creep open & creep close. This allows for a creep speed feature. Meaning; when the radiation shielding door (neutron door) nears the full open and closed positions the creep limits are set to be activated. The operator is dropped into creep speed and the door is decelerated and the door moves slowly into the full open and closed positions. The advantage of this is less wear and tear on the electric operator, door and door hardware and better and more precise positioning of the door.
4. The operators all have an electric clutch incorporated into the drive train. This allows for torque output control as well as the ability for free egress in the case of a power failure. The electric clutch is provided with an adjustable torque control. The amount of torque output can be varied to suit each specific application by simply adjusting the controller. It is not classified as a safety device but limiting the amount of torque output makes the mechanism safer. In the case a power failure or deactivation of the electric clutch, disengages the electric operator from the door allowing for the door to be opened manually. A further advantage to the electric clutch in equipment protection. If the travel of the door is impeded the clutch will slip preventing the operator drive train from damage.
5. 5 models designed for specific radiation shielding door (neutron door) sizes and weights, 1, 2, 2.5, 3 & 4 all come with an oversized output shaft. Sizes 2.5, 3 & 4, the right angle gearboxes on these models are a hollow shaft type allowing for the output shaft to be replaced without disassembling the gearbox.
6. The units come with an industrial rotary limit switch assembly that is rotated directly by the rotation of the output drive shaft. The gear ratio of the assembly is as low as possible making the assembly as sensitive as possible. The limits are easily adjusted and designed to be fine adjusted with a simple flat blade screw driver.
7. The electrical controls and motor and drive train are also protected electrically with internal fusing, thermal overloads and run timers. The run timers prevent the electric operators from continuously running due to improper limit switch setting, door travel obstruction or limit switch failure.
8. The electric operators are designed and built for continuous duty, meaning we do not limit the number of cycles per minute. The electric motor, controls and drive train are sized to run continuously. All gearboxes are filled with synthetic oil. The gearbox lubricants will never need to be replaced.
9. The drive components are manufactured by the industry leaders, Boston Gear, Warner & Baldor. Please refer to their specific catalog cuts for more information.
10. The electric controls are assembled in a NEMA 12 electrical enclosure with industrial wiring terminals provided to land all the field wiring. The enclosures come with a built in disconnect switch and have been bench tested with each specific electric operator, set of actuating controls and safety devices prior to shipment.
11. Any number of safety devices can typically be included into the electrical logic.

Radiation Protection Products
P.O. Box 862
Wayzata, MN 05391
Tollfree: (800) 328-3361
Fax: (952) 476-8445
E-mail: bcohen@rppinc.com
Web site: http://www.radiationproducts.com