DHS 157.73(17)(a)3.3. Operability of the radiation monitor for radioactive contamination in pool water required by sub. (16) (b) using a radiation check source, if applicable. DHS 157.73(17)(a)7.7. Visual inspection of leak-tightness of systems through which pool water circulates. DHS 157.73(17)(a)8.8. Operability of the heat and smoke detectors and extinguisher system required by sub. (4), without turning extinguishers on. DHS 157.73(17)(a)12.12. Functioning and wear of the system, mechanisms and cables used to raise and lower sources. DHS 157.73(17)(a)13.13. Condition of the barrier to prevent products from hitting the sources or source mechanism as required by sub. (8). DHS 157.73(17)(b)(b) Malfunctions and defects found during inspection and maintenance checks shall be repaired within time frames specified in the license or license application. DHS 157.73(18)(a)(a) A pool water purification system shall maintain the conductivity of the pool water below 20 microsiemens per centimeter under normal circumstances. If pool water conductivity rises above 20 microsiemens per centimeter, a licensee shall take prompt actions to lower the pool water conductivity and shall take corrective actions to prevent future recurrences. DHS 157.73(18)(b)(b) A licensee shall measure the pool water conductivity frequently enough, but no less than weekly, to assure that the conductivity remains below 20 microsieverts per centimeter. Conductivity meters must be calibrated at least annually, at intervals not to exceed 13 months. DHS 157.73(19)(a)(a) Both an irradiator operator and at least one other person who is trained on how to respond and prepared to promptly render or summon assistance if the access control alarm sounds shall be present on site during any of the following times: DHS 157.73(19)(a)1.1. Whenever the irradiator is operated using an automatic product conveyor system. DHS 157.73(19)(a)2.2. Whenever the product is moved into or out of the radiation room when the irradiator is operated in a batch mode. DHS 157.73(19)(b)(b) A person who has received the training on how to respond to alarms described in sub. (12) (g) shall be on site at a panoramic irradiator at which product is exposed to radiation with no movement of the product. DHS 157.73(19)(c)(c) At an underwater irradiator, an irradiator operator shall be present at the facility whenever the product is moved into or out of the pool. Persons who move the product into or out of the pool of an underwater irradiator need not be qualified as irradiator operators, but shall have received the training described in sub. (12) (f) and (g). Static irradiations may be performed without a person present at the facility. DHS 157.73(20)(a)(a) Upon first entering the radiation room of a panoramic irradiator after an irradiation, the irradiator operator shall use a survey meter to determine that the source has returned to its fully shielded position. The operator shall check the functioning of the survey meter with a radiation check source prior to entry. DHS 157.73(20)(b)(b) Before exiting from and locking the door to the radiation room of a panoramic irradiator prior to a planned irradiation, the irradiator operator shall do all the following: DHS 157.73(20)(b)1.1. Visually inspect the entire radiation room to verify that no one else is in it. DHS 157.73(20)(b)2.2. Activate a control in the radiation room that permits the sources to be moved from the shielded position only if the door to the radiation room is locked within a preset time after setting the control.