Industrial Radiography Equipment Need for a review of the effectiveness of the implementation of ISO 3999? IAEA Technical Meeting Vienna, June 2014 Richard van Sonsbeek

Radiography Equipment at Applus RTD Make and type varies between Business Units / Countries Maintenance is done in-house and by third parties  If maintenance is done in-house then the employees are trained and authorized by the manufacturer In the past RTD proposed and made several improvements of exposure devices based on the experience of use in the field which let to a reduction in the number of equipment malfunction | 2

Maintenance program items Equipment is subject to scheduled calibration / inspection routine (Quarterly) Radiographers inspect all equipment prior to use / daily and records are kept Any abnormal events are required to be forwarded to their RPO / Ops Managers, Typically equipment will be swapped out for maintenance or repair Electrical equipment is inspected and tagged “Fit for Use” as per schedule Monitoring equipment checked prior to mobilization to job Equipment history (inspections, repairs, problems, etc) is maintained via records | 3

Specifications Exposure Devices ISO Safety devices  Securing devices “It shall not be possible to lock the exposure container unless the source assembly is in the secured position”  Indications of secured position or not “The apparatus shall be designed such that it is possible to determine if the source holder is in the sercured position from a distance of at least 5 m.” 5.6 Source-assembly security “It shall be possible to connect or disconnect the source assembly from the end of the control cable without the use of any tool, …”

Safety / Securing Devices may fail /1 The bar is behind the key lock. When the guide tube is not connected, the key lock cannot be opened Over time, due to wear and tear, the “golden” part cannot be pushed away far enough by the guide tube.

Safety / Security Devices may fail /2 Selenium Gammamat Sometimes the lock only closes half way (1) Cause:  Source assembly can be pulled back too far (2 vs. 4)  Slider plate gets stuck behind source assembly (3) Possible Root Cause:  Manufacturing not according to design specification Too much tolerance allowed Materials used during manufacturing are of lesser quality than materials used during endurance test

Underlying (Root) Causes? Design of Exposure Devices shall ensure continued operation under normal conditions of use. This shall be demonstrated by satisfactory performance of the tests indicated in clause 5.8 of ISO Are exposure devices always manufactured according to design specifications, e.g. with respect to the quality of used materials and tolerances in the production of its constituting parts? Do the tests sufficiently account for the conditions under which the devices are used in the field? Are end users sufficiently involved in determining the design criteria to make use of their knowledge and experience?  What is their representation in the working group that drafts ISO 3999?

Consequences of failing safety devices Unsafe operations potentially leading to radiation incidents Source retrieval becomes more complicated, potentially leading to more severe consequences

What to do about this? Performance of Exposure Devices and their safety and securing devices under the conditions in which they are used in the field should be reviewed and evaluated  Preferably by an independent party  Perhaps via a study on behalf of the IAEA? Based upon this, the design criteria including relevant test (ISO 3999) and consequently the design for these devices, and their manufacturing could and should be improved

What to do further? Improving the dissemination of information  Obviously on lesson learned from accidents in which equipment malfunctioning was a cause  But also on other incidents and events that had the potential for becoming or contributing to and accident and in which equipment malfunctioning was a cause Setting up an international database and promote the industry to use it both by providing information and using it (per ISEMIR initiative)