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B163 upgrade - Final design review of CDS
Description
Participants:
Ch. Barth, R. Gueydon A. Lees, O. Pirotte, G. Riddone, A. Vande Craen
Minutes of the meeting held on 21 Nov 2018
The main subject was the final design of the CDS of the B163.
A. Lees mentioned the new requirements from MSC to operate F2 inner cryostat with GHe, requiring changes to the design of the CDS and valve selection. For the moment this functionality is not approved yet as the implications on the other systems are under evaluation. A. Vande Craen reminded that the cryostat has not been designed for this extra requirement. No modifications on the the cryostat are foreseen.
The operation modes have been recalled. For each operation mode, the PDF has been presented. The additional need is taken into consideration (see operation mode "cold GHe"). The mixing chamber already exists, but an additional valve is needed together with a separate collector to allow GHe flow through all filling lines. In addition, another valve has to be modified to incorporate GHe operation in F1 internal cryostat.
O. Pirotte made the remark that with this configuration the CDS will be flexible for future operation of F1 and F2.
The main components (valve box satellite boxes for F1 and F2, warm pumping unit, very low pressure heater, junction box and 15 kW heater) and related functions have been listed.
The SV set pressure for new equipment is limited by the 6000 l LHe dewar. The SV set pressure for F1 and the STC are low and the valves are small:
- The safety systems may need to be updated [ACTION TE-MSC, Ch. Barth]
- The SV set pressures used shall be consistent with the CDS
An ad-hoc meeting on F1 safety has to be organised [ACTION G. Riddone to contact A. Devred]
The integration in the pits is completed. Most of the components are below floor, allowing for an easy access.
The current control systems will have to be upgraded (including both consolidation and replacement of existing components). All software will be upgraded to the lastest version.
As a conclusion, the sizing of valves and piping is complete. The PID for CDS, Fresca 1 and Fresca 2 are available for review. The technical specification was completed early Oct 2018. The offers will be provided on Nov 26 for a delivery in Sept 2019. The new requirement is not integrated yet. TE-CRG will ask for it and we will wait for the company feedback before any decision.
The next ITs will be for the warm infrastructure and WPU.
The planning has been presented and it is the same as the one presented at the PRM.
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