The Divertor Tokamak Test facility (DTT) will operate with D-D plasmas producing pulses lasting about 60 s and producing a neutron yield up to 1.5 × 1017 n/s. Due to the high neutron yield, a significant activation of the structures and residual radioactivity after shut-down will be present. Consequently, DTT will need a robust radiation protection system to prevent undue worker and population exposure. The objectives of this system must be met during normal operation, maintenance, decommissioning and in emergency situations, thus several safety features must be routinely guarantee, among which the radiation monitoring system is probably the most crucial. This paper presents the general requirements of this monitoring system, giving some details about the preferred characteristics for the involved devices and monitors. The monitoring system shall be composed by portable instruments, passive ambient dosimeters and a limited number of fixed active measuring stations, suitable to detect and record the appropriate dosimetric quantities both for neutrons and photons. The active measuring stations and the passive dosimeters will constitute two monitoring networks designed in such a way to cover the area of interest to radiological survey around DTT.

Ionizing radiation monitoring requirements at the Divertor Tokamak Test facility

Sandri S.;Angelone M.;Contessa G. M.;Guardati M.;Villari R.
2020

Abstract

The Divertor Tokamak Test facility (DTT) will operate with D-D plasmas producing pulses lasting about 60 s and producing a neutron yield up to 1.5 × 1017 n/s. Due to the high neutron yield, a significant activation of the structures and residual radioactivity after shut-down will be present. Consequently, DTT will need a robust radiation protection system to prevent undue worker and population exposure. The objectives of this system must be met during normal operation, maintenance, decommissioning and in emergency situations, thus several safety features must be routinely guarantee, among which the radiation monitoring system is probably the most crucial. This paper presents the general requirements of this monitoring system, giving some details about the preferred characteristics for the involved devices and monitors. The monitoring system shall be composed by portable instruments, passive ambient dosimeters and a limited number of fixed active measuring stations, suitable to detect and record the appropriate dosimetric quantities both for neutrons and photons. The active measuring stations and the passive dosimeters will constitute two monitoring networks designed in such a way to cover the area of interest to radiological survey around DTT.
Divertor Tokamak Test facility
Radiation measurements
Radiation monitoring
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/56503
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