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WP6 coordination meeting #3
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Europe/Zurich
892/1-B09 (CERN)
WP6 coordination meeting #3
- B911 shaft shielding
o Prompt dose rates were evaluated for the shaft in b911 without any concrete shielding
o Preliminary results show low enough dose rates without shielding opening up removing (parts) of the shielding for routing of utilities
o Final confirmation expected soon with higher statistics
o Question about R2E constraints in shaft. Action/Oriol to contact Luigi (WP6)
- Preliminary radioactive waste zoning
o Dose rate surveys after short cool-down times were performed in TCC8/ECN3 allowing to classify the areas into 3 different zones:
§ A priori radioactive: TCC8 down to blue wall; in-beam equipment up to the decay tubes; in-beam equipment close to the ECN3 dump
§ Potentially radioactive: downstream NA62 detectors (e.g. straw stations)
§ A-priori non-radioactive: decay region (except from in-beam material)
o Activation risks of liquid crypton calorimeter and its mechanical structure to be further investigated. Action/Fred to see if potentially samples could be taken
- TCC8 dismantling simulations
o New FLUKA simulations for residual dose rates taking shift of LS3 start into account for different cool-down times: Jan 2027 (6 months cool-down) and Sep 2027 (1 year and 2 months cool-down)
o Residual dose rates with and without equipment were investigated
o Ongoing studies: Residual dose rates of standalone objects as well as of concrete blocks
- RP waste:
o For RWM it would be ideal to couple the dismantling and the packaging such that the waste items are directly placed in their respective disposal containers onsite. This option entails a grater planning effort but it reduces in the end the workload and exposure as the waste doesn’t need to be placed into a transport container, transported to the RWTCS, further dismantled/sorted (if necessary) and packaged into its disposal container. The alternative option is to decouple the dismantling from the packaging (easier planning). That is, we just plan the dismantling and the transport to the RWTCS. The additional dismantling/sorting and packaging are addressed separately
o Input needed Action/Jean-Louis/STI:
§ The preliminary classification results are based on mass values that are often calculated as the product of the FLUKA volume and the material density. Actual mass values are needed
§ The masses and dimensions of the equipment groups are needed to identify the adequate transport and disposal containers to be used and, eventually, the separation strategy for those which need to be dismantled
- Access & Safety Systems
o Access system during TCC8 dismantling is being investigated (Action/Boris)
o Budget from NA-CONS to be used for replacement of fire detection system
o Overall NA-CONS budget for access and safety systems is being investigated (Action/Boris)
o Action/Claudia: organize meeting with BE-DSO and EN-AA for access system elements (pre-LS3 and BDF operation)
For FIRIA, Safety and Occupational Safety check below minutes
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