Hi Adam, Frazier is right about the ISOCS systems and surveying of complex components. We have used the ISOCS system as part of MARSAME based protocols with manual surveying and removable contamination samples to release components at several PWR sites. It's the only way to really look into a component without having to make a science project out of cutting it open to get at all the surfaces.
For components like this we would first perform a historical assessment on it to determine the likely hood of contamination and classify it based on MARSAME to determine the level of sampling we would need. The release criteria for each surveying method can be matched with the site to ensure that there are no conflicts with the RP program. We would then manually survey a percentage of the accessible areas (this can vary greatly depending on how it was removed i.e. whole sections or cut up) plus smears. We would use the characteristics of the component to determine the most likely areas for contamination deposition to build a geometry such as impingement points or packing material for valves. We would then shoot the components with the ISOCS system encompassing 100% of the object and from multiple sides and angles if it is a very large component. We would compare those results with the manual surveys and site HP surveys to ensure that everything was clean before release. Sometimes if you can identify a localized contamination area that can be removed for rad waste and the remainder can be resurveyed and released. Nasser Nasser Rashidifard, MS, CHP Corporate Health Physicist Radiation Safety & Control Services Inc. 91 Portsmouth Ave, Stratham NH, 03885 [email protected]<mailto:[email protected]> Office: 603-778-2871 x240 Cell: 781-856-2180 From: Bronson, Frazier [mailto:[email protected]] Sent: Tuesday, February 6, 2018 19:22 To: Hall, Adam R <[email protected]>; '[email protected]' <[email protected]> Subject: [powernet] RE: condenser tube change out PWR Adam: The ISOCS InSitu gamma spec system has been frequently used for this kind of application - quantifying the gamma activity [or the upper bounds of non-activity] in heat exchangers, scaffolding bundles, pipe bundles, ... at D&D project, or Large Component replacement projects. Frazier Bronson CHP Mirion Technologies - Canberra From: Hall, Adam R [mailto:[email protected]] Sent: Tuesday, February 06, 2018 5:39 PM To: '[email protected]' Subject: [powernet] condenser tube change out PWR We are changing out our main turbine condenser tubes at Waterford 3 next January. Has any other PWR done this? Did you do any verification that they were not rad material? If so what did you do? We had small primary to secondary leaks a long time ago. Thanks, Adam Hall Radwaste Specialist Waterford 3 504-464-3200 [Image result for radwaste cartoon]<https://www.google.com/url?q=https://www.dreamstime.com/stock-illustration-cartoon-hazmat-waste-illustration-man-suit-barrel-radioactive-image47714317&sa=U&ved=0ahUKEwit5-uE_I7XAhWH7YMKHYmaCbcQwW4IFjAA&usg=AOvVaw37epVjwHWQ-VjfVfXn1WbA>
