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Insertable B Layer Cooling System Safety issues

Insertable B Layer Cooling System Safety issues. Bart Verlaat Jan Godlewski. Radiation hazard from CO2 cooling system.

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Insertable B Layer Cooling System Safety issues

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  1. Insertable B Layer Cooling System Safety issues Bart Verlaat Jan Godlewski J.Godlewski PH-DT-PO

  2. Radiation hazard from CO2 cooling system J.Godlewski PH-DT-PO CMS is planning to install CO2 cooling system in the underground area with configuration very similar to the IbL one. The difference is in cooling capacity and CO2 quantities.

  3. Radiation hazard from CO2 cooling system (cont.) Estimation of the radiation hazards from the CO2 pixel cooling system I.Kurochkin, H.Vincke DGS-RP-AS, CERN J.Godlewski PH-DT-PO CMS cooling system has 4 times more CO2 in the circuit. Estimation of radiation hazard has been made for CMS See next slides for the conclusions

  4. Summary I • During operation time the maximal effective dose equivalent rate does not exceed values of 3 nSv/h at 10 cm from CP . • In emergency case (100 g CO2 in 1.2 m3 of air per hour) effective dose equivalent rate due to inhalation exposure pathway can reach 34 nSv/h. • Comparison with LE and LA limits shown that radiation risks from the Cooling plant is much less the legislative values, the sum of all contributing radionuclide ratios are 0.04 and 0.001 for LE and LA limits, respectively. • At once after shutdown the maximal effective dose equivalent rate reaches a values of 30 nSv/h at 10 cm from the storage tank surface. J.Godlewski PH-DT-PO

  5. Summary II • The value of maximal effective dose equivalent rate for first 24 hours decreases more than 10 times. Be-7 defines effective dose rate. • In emergency case, effective dose equivalent rate due to inhalation exposure pathway can reach 15 nSv/h. • Comparison with LE and LA limits shown that radiation risks from the storage tank cooling is much less the legislative values, the sum of all contributing radionuclide ratios are 0.02 and 0.01 for LE and LA limits, respectively. • Specific airborne activity which can be released in USC55 area does not exceed a value of 0.05 CA • Zone close CP and storage tank can be classified as Non-designated area (<2.5 μSv/h).. J.Godlewski PH-DT-PO

  6. Pressure and ODH J.Godlewski PH-DT-PO • CO2 cooling systems have high working pressure and have to be tested to the pressures exceeding 100 bar. • All the components have to be certified for this pressures. • Staves and inlet outlet pipes to PP1 • Transfer lines • Distribution box in sector 5 • Cooling units • All volumes which could be closed while operating and/or maintaining the system will be equipped with safety valves. • On the platform where cooling station will be placed both CO2 and ODH sensors will be installed and connected with cooling system control and DSS

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