DHS 157.73(5)(a)(a) An irradiator with an automatic product conveyor system shall have a radiation monitor with an audible alarm located to detect loose radioactive sources that are carried toward the product exit. If the monitor detects a source, an alarm shall sound and product conveyors shall stop automatically. The alarm shall be capable of alerting a person in the facility who is prepared to summon assistance. An underwater irradiator in which the product moves within an enclosed stationary tube is exempt from the requirements of this paragraph. DHS 157.73(5)(b)(b) An underwater irradiator that is not in a shielded radiation room shall have a radiation monitor over the pool to detect abnormal radiation levels. The monitor shall have an audible alarm and a visible indicator at entrances to the personnel access barrier around the pool. The audible alarm may have a manual shut-off. The alarm shall be capable of alerting a person who is prepared to respond promptly. DHS 157.73(6)(a)(a) The mechanism that moves the sources of a panoramic irradiator shall require a key to actuate. Actuation of the mechanism shall cause an audible signal to indicate that the sources are leaving the shielded position. Only one key may be in use at any time, and only operators or facility management may possess it. The key shall be attached to a portable radiation survey meter by a chain or cable. The lock for source control shall be designed so that the key may not be removed if the sources are in an unshielded position. The door to the radiation room shall require the same key. DHS 157.73(6)(b)(b) The console of a panoramic irradiator shall have a source position indicator that indicates when the sources are in the fully shielded position, in transit and exposed. DHS 157.73(6)(c)(c) The control console of a panoramic irradiator shall have a control that promptly returns the sources to the shielded position. DHS 157.73(6)(d)(d) The function of each control for a panoramic irradiator shall be clearly marked. DHS 157.73(7)(a)1.1. Constructed with a water-tight stainless steel liner or a liner metallurgically compatible with other components in the pool. DHS 157.73(7)(a)2.2. Constructed so that there is a low likelihood of substantial leakage and with a surface designed to facilitate decontamination. DHS 157.73(7)(b)(b) A licensee shall have a method to safely store the sources during repairs of the pool. DHS 157.73(7)(c)(c) An irradiator pool shall have no outlets more than 0.5 meter below the normal low water level that may allow water to drain out of the pool. Pipes that have intakes more than 0.5 meter below the normal low water level and that may act as siphons shall have siphon breakers to prevent the siphoning of pool water. DHS 157.73(7)(d)(d) A method shall be available to replenish water losses from the pool. DHS 157.73(7)(e)(e) A visible indicator shall be provided in a clearly observable location to indicate if the pool water level is below the normal low water level or above the normal high water level. DHS 157.73(7)(f)(f) An irradiator pool shall be equipped with a purification system designed to be capable of maintaining the water during normal operation at a conductivity of 20 microsiemens per centimeter or less and with a clarity so that the sources are clearly visible. DHS 157.73(7)(g)(g) A physical barrier, such as a railing or cover, shall be used around or over irradiator pools during normal operation to prevent personnel from accidentally falling into the pool. The barrier may be removed during maintenance, inspection and service operations. DHS 157.73(7)(h)(h) If long-handled tools or poles are used in an irradiator pool, the radiation dose rate to the operator at the handling areas of the tools may not exceed 0.02 millisievert (2 mrem) per hour. DHS 157.73(8)(8) Source rack protection. If the product to be irradiated moves on a product conveyor system, the source rack and the mechanism that moves the rack shall be protected by a carrier or guides to prevent products and product carriers from hitting or touching the rack or mechanism. DHS 157.73(9)(a)(a) If electrical power at a panoramic irradiator is lost for longer than 10 seconds, the sources shall automatically return to the shielded position. DHS 157.73(9)(b)(b) The lock on the door of the radiation room of a panoramic irradiator shall remain locked in the event of a power failure. DHS 157.73(9)(c)(c) During a power failure, the area of any irradiator where sources are located may be entered only when using an operable and calibrated radiation survey meter. DHS 157.73(10)(10) Design requirements. An irradiator shall meet all of the following design requirements: DHS 157.73(10)(a)(a) Shielding. For a panoramic irradiator, a licensee shall design shielding walls to meet generally accepted building code requirements for reinforced concrete and design the walls, wall penetrations, and entranceways to meet the radiation shielding requirements of sub. (3). If the irradiator will use more than 2 x 1017 becquerels (5 million Ci) of activity, a licensee shall evaluate the effects of heating of the shielding walls by the irradiator sources. DHS 157.73(10)(b)(b) Foundations. For a panoramic irradiator, a licensee shall design the foundation, with consideration given to soil characteristics, to ensure that the foundation is adequate to support the weight of the facility shield walls. DHS 157.73(10)(c)(c) Pool integrity. For a pool irradiator, a licensee shall design the pool to ensure all of the following: DHS 157.73(10)(c)2.2. That the pool is strong enough to bear the weight of the pool water and shipping casks.