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Vacuum Servicing System Design Overview

The SVS provides vacuum services to vulnerable components with double containment. Services include roughing, backfilling, monitoring, and more for about 1500 clients. The redesigned system enhances modularity, leak detection, and tritium compatibility.

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Vacuum Servicing System Design Overview

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  1. Service Vacuum SystemDesign status Sept 2009 B. Boussier ITER IO

  2. SVS overview • SVS is designed to provide vacuum servicing to a large number of clients. Clients are mainly vulnerable components that require double containment with monitored interspaces. In addition, systems requiring vacuum to operate and temporary interspaces formed on a valve closure can also be services by the SVS in order to restrict the number of pumping system required. (Cryogenic isolation vacuum is not to be considered and pumped by a separate system, to avoid any chance of tritium contamination of the super-insulated lines). • Services includes: • Roughing • Backfilling • Purging/flushing • Pressure monitoring • High Vacuum pumping with dedicated local HV pumps if required. • About 1500 clients estimated so far • In addition, design should: • Be modular and flexible to the maximum extend • Allow leak detection/localization • Be tritium compatible

  3. Old SVS • The old SVS design was based on a set of ring manifolds on L1 and under the NB cell : • Roughing ring manifold (DN300) – provide roughing to clients • Leak Detection manifold (DN300) – provide connection to VPR for leak detection • Guard vacuum manifold (DN300) – provide High vacuum to clients • Tracer and purge gas lines. • No routing was designed to port cells or distribution boxes (also not designed). • Routing to out of date location of the pumping room. • Cross contamination of systems unavoidable (tritium). • Design required many additional cryocoolers, pipes and compressors and is oversized… Also: SVS Requirements evolved… Routing above NB cell should already have disappeared Cryocoolers

  4. Old SVS draft PFD Vacuum Pumping Room A Client RP Sorption Cryocoolers (x 6) SGVS S COVB SRS SLDS Leak Detection Condensation cryocoolers (x 6) C

  5. New SVS • Based on same routing for main ring manifolds on L1 and under the NB cell, but assignation and sized modified (DN150): • Non tritium roughing – to rough Cryostat type clients (see tritium only in case of incident) • Tritium roughing –to rough Torus type clients (likely to see tritium from simple, single leaks) • Exhaust manifold – to route out purge gas from tritiated clients • Tracer gas, vent gas and purge gas lines • Vertical distribution uses every other pipe shaft to service distribution boxes in port cells. • Cross contamination is reduced to a maximum extend (Cryogenic insulation vacuum is provided buy a separate system (CGVS)) • Leak detection is provided through roughing manifold and MSLD in pumping room. In addition, local leak detector can be connected on boxes. • High vacuum is provided by local HV pumps (few clients) • Type 1 Diagnostics and ECRH serviced by SVS.

  6. New SVS draft PFD (Not approved - for information only)

  7. Side by side Comparison Old SVS New SVS New SVS New ring manifolds Old ring manifolds Old SVS New SVS

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