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Comparison of Measured and Calculated Dose Rates for Ring Injection Dump Exchange at Spallation Neutron Source...

by Irina I Popova, Franz X Gallmeier, Christi L Elam, Ryan P Schultz
Publication Type
Conference Paper
Book Title
Publication Date
Page Numbers
1038 to 1043
Publisher Location
Illinois, United States of America
Conference Name
2023 ANS Winter Conference and Expo
Conference Location
Washington, District of Columbia, United States of America
Conference Sponsor
Conference Date

According to the accelerator operation plan, the beam-stop and the proton beam window (PBW) assemblies of the existing Ring Injection Dump RID are replaced with fresh assemblies, when they have reached their end-of-life. End of-life is determinate by the stainless-steel beam-stop window having accumulated 10 dpa radiation damage. The exchange process took place during facility maintenance period that started in March 2023. Each of the spent assembles were put into specially designed storage containers temporarily residing near the RID building.
The spent beam-stop is predicted to be the part of highest activation that has been removed in Spallation Neutron Source (SNS). The exchange processes require good work planning to minimize radiation exposure to personal. For each exchange step the residual dose rate distribution is calculated and the peak values are identified. This paper gives some examples of calculated vs measured doses during beam-stop assembly exchange.