A2-4 overview of remote maintenance scenarios for the ITER machine

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:196842

Haange, R ^[1]

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1. ITER Joint Central Team, Ibaraki-ken (Japan)

Components inside the ITER cryostat will become activated due to neutron irradiation such that after only a short operational period with DT fuel, maintenance will have to be done by remote means. Further remote handling operations will be required outside the cryostat, e.g. hot cells, and limited remote maintenance could be required in plant rooms adjacent to the cryostat. This paper deals, however, exclusively with maintenance operations inside the cryostat boundary. The main components inside and outside the vacuum vessel have been given a remote handling classification according to their scheduled or unscheduled maintenance requirement and their replacement has been studied. Maintenance operations inside the vacuum vessel and cryostat will in many cases be carried out under harsh environmental conditions concerning gamma flux, temperature, access and visibility and require to be verified under as close as possible simulated conditions and well rehearsed before the start of the active operations phase. The following maintenance scenarios will be reviewed, some of which require the venting of the vessel or the venting of the cryostat or both: (1) Replacement of blanket modules (2) Replacement of divertor modules (3) Replacement of vacuum pumping systems inside cryostat (4) Replacement of TF coils (require removal & re-installation of CS assembly as well as vacuum vessel sector) (5) Maintenance of PF coils, some of which are trapped underneath the vacuum vessel and support structure.

• OSTI ID: 196842
• Report Number(s): CONF-940664--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BREEDING BLANKETS
DIVERTORS
ITER TOKAMAK
MAGNET COILS
PULSED D-T REACTORS
REACTOR MAINTENANCE
REMOTE HANDLING
VACUUM PUMPS