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Safety Issues and Material Classification in XFEL Cryomodule Discussions

This document outlines the preliminary safety discussions held by AfA and TÜV regarding the XFEL Cryomodule on July 2, 2004, and September 27, 2004. It highlights the classification of pressure vessels and the expected mechanical properties of niobium at cryogenic temperatures. The potential safety concerns of using niobium are addressed, proposing that titanium vessels and the cryostat serve as safety containers. The introduction of procedures for approval of CrNi welding and titanium vessel weldings are also discussed.

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Safety Issues and Material Classification in XFEL Cryomodule Discussions

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  1. Safety issues, AfA/TÜV • First meeting with AfA (Amt für Arbeitsschutz) • 2-July-04 • Druckbehälterklassifizierung der XFEL-Cryomodule • No problems expected • But: • Niobium is not a qualified material for cold temperature (mechanical properties) • This can be mitigated by arguing that the Ti-Vessel and the Cryostat are the safety containers • First meeting with TÜV-Nord • 27-Sep-04 • Introduction for the TÜV to propose a procedure for approval for • CrNi-welding 2K • Ti-Vessel weldings • …. Lutz Lilje DESY -MPY-

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