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MERIT pre-installation review: Preliminary conclusions

This document outlines the preliminary conclusions of the safety review for the mercury system installation at TT2A during the PS2 run. Key issues discussed include the installation of LEXAN covers, current procedures for cryogenics and solenoid operation, outcomes from non-destructive tests on welds, and the need for a formal collaboration response. It emphasizes the importance of personnel radiation dose plans, the investigation of PU foam usage, and safety measures for cryostats and vacuum jackets. Comprehensive documentation of materials used is being reviewed.

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MERIT pre-installation review: Preliminary conclusions

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  1. MERIT pre-installation review:Preliminary conclusions Fabich

  2. Follow-up:Safety Review of mercury system http://edms.cern.ch/document/754444/ Draft answer: http://cern.ch/merit/doc/HgSafetyReviewAnswer.htm Hot issues: • Item 11: LEXAN cover on sump tank and as lid • Latest documentation on used materials and procedures is currently looked at.

  3. Follow-up:Cryogenics and solenoid review https://edms.cern.ch/file/710659/1/memorandum.pdf • Item 2: User’s notice. Yet now written procedures on installation and operation of the solenoid&cryogenics have been provided. • Cryogenics part by AT/ECR • Item 5: Results of non-destructive test (x-rays of welds) • Item 8: formal answer by collaboration is required.

  4. Pre-installation review • Installation in TT2A during PS2 run with beam possible. • Personnel radiation dose plan and access procedures need to be written. • The use of PU foam is currently investigated. • Safety valves of cryostat and vacuum jacket. • Maximum operating pressure of cryostat limited to 10 bar. Resolves a lot of issues. • A lot is dependent on the surface tests at build 180: leak test (warm and cold), condensation.

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