South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-63 - Radioactive Materials (Title A) › Part XI - LICENSING AND RADIATION SAFETY REQUIREMENTS FOR IRRADIATORS › Section 61-63.XI.RHA 11.16 - Design Requirements

Current through Register Vol. 48, No. 6, June 28, 2024
Irradiators whose construction begins after July 1, 1996, must
				  meet the design requirements of this section.
11.16.1 Shielding. For panoramic irradiators, the
				licensee shall design shielding walls to meet generally accepted building code
				requirements for reinforced concrete and design the walls, wall penetrations, and
				entryways to meet the radiation shielding requirements of
				RHA
				11.9. If the irradiator will use more than 5 million curies
				(2 x 1017 becquerels) of activity, the licensee shall evaluate the effects of
				heating of the shielding walls by the irradiator sources.
11.16.2 Foundations. For panoramic irradiators,
				the licensee shall design the foundation, with consideration given to soil
				characteristics, to ensure it is adequate to support the weight of the facility
				shield walls.
11.16.3 Pool integrity.
				For pool irradiators, the licensee shall design the pool to assure that it is leak
				resistant, that it is strong enough to bear the weight of the pool water and
				shipping casks, that a dropped cask would not fall on sealed sources, that all
				outlets or pipes meet the requirements of paragraph 11.13.2 and that metal
				components are metallurgically compatible with other components in the
				pool.
11.16.4 Water handling system. For
				pool irradiators, the licensee shall verify that the design of the water
				purification system is adequate to meet the requirements of paragraph 11.13.5. The
				system must be designed so that water leaking from the system does not drain to
				unrestricted areas without being monitored.
11.16.5 Radiation monitors. For all irradiators,
				the licensee shall evaluate the location and sensitivity of the monitor to detect
				sources carried by the product conveyor system as required by paragraph 11.11.1. The
				licensee shall verify that the product conveyor is designed to stop before a source
				on the product conveyor would cause a radiation overexposure to any person. For pool
				irradiators, if the licensee uses radiation monitors to detect contamination under
				paragraph 11.22.2, the licensee shall verify that the design of radiation monitoring
				systems to detect pool contamination includes sensitive detectors located close to
				where contamination is likely to concentrate.
11.16.6 Source rack. For pool irradiators, the
				licensee shall verify that there are no crevices on the source or between the source
				and source holder that would promote corrosion on a critical area of the source. For
				panoramic irradiators, the licensee shall determine that source rack drops due to
				loss of power will not damage the source rack and that source rack drops due to
				failure of cables (or alternate means of support) will not cause loss of integrity
				of sealed sources. For panoramic irradiators, the licensee shall review the design
				of the mechanism that moves the sources to assure that the likelihood of a stuck
				source is low and that, if the rack sticks, a means exists to free it with minimal
				risk to personnel.
11.16.7 Access
				control. For panoramic irradiators, the licensee shall verify from the design and
				logic diagram that the access control system will meet the requirements of
				RHA
				11.8.
11.16.8
				Fire protection. For panoramic irradiators, the licensee shall verify that the
				number, location, and spacing of the smoke and heat detectors are appropriate to
				detect fires and that the detectors are protected from mechanical and radiation
				damage. The licensee shall verify that the design of the fire extinguishing system
				provides the necessary discharge patterns, densities, and flow characteristics for
				complete coverage of the radiation room and that the system is protected from
				mechanical and radiation damage.
11.16.9
				Source return. For panoramic irradiators, the licensee shall verify that the source
				rack will automatically return to the fully shielded position if offsite power is
				lost for more than 10 seconds.
11.16.10
				Seismic. For panoramic irradiators to be built in seismic areas, the licensee shall
				design the reinforced concrete radiation shields to retain their integrity in the
				event of an earthquake by designing to the seismic requirements of an appropriate
				source such as American Concrete Institute Standard ACI 318-89, "Building Code
				Requirements for Reinforced Concrete," Chapter 21, "Special Provisions for Seismic
				Design," or local building codes, if current.
11.16.11 Wiring. For panoramic irradiators, the
				licensee shall verify that electrical wiring and electrical equipment in the
				radiation room are selected to minimize failures due to prolonged exposure to
				radiation.