Unit:
Κατεύθυνση Ιατρική Φυσική-ΑκτινοφυσικήLibrary of the School of Health Sciences
Supervisors info:
Ίων-Ευάγγελος Σταματελάτος , Διευθυντής Ερευνών, Ε.ΚΕ.Φ.Ε. «ΔΗΜΟΚΡΙΤΟΣ»
Ευάγγελος Παντελής, Αναπληρωτής Καθηγητής, Ιατρική Σχολή, ΕΚΠΑ
Θεοδώρα Βασιλοπούλου, Ερευνήτρια Γ, Ε.ΚΕ.Φ.Ε. «ΔΗΜΟΚΡΙΤΟΣ»
Original Title:
Ακτινοπροστασία προσωπικού σε σταθμούς ηλεκτροπαραγωγής πυρηνικής σύντηξης
Translated title:
Radiation protection of personnel in nuclear fusion power plants
Summary:
The DEMO fusion plant aims to demonstrate the necessary technologies for producing electricity from fusion on a large scale. Therefore, schedule maintenance activities are of outmost importance for safe, consistent and reliable DEMO operation. Scope of this work is a preliminary estimation of the collective dose received by workers during scheduled maintenance activities in DEMO. After shut-down for maintenance, the radiological risks for workers originate from external exposure to gamma radiation due to material activation and internal exposure, mainly due to tritium used as fuel. Operational Radiation Exposure (ORE) estimates were performed in order to get an index of the collective dose during different scheduled maintenance scenarios. The calculated collective dose values were compared against Collective Dose target value of 700 p•mSv/y taken from other nuclear facilities. Manual performance of scheduled maintenance activities in the tokamak building resulted in Collective Dose values significantly higher than the set target. However, the results showed that collective dose strongly depends on the external dose received by personnel in specific DEMO rooms such as the Rupture Disk Port Cell (11-L2-PC) room and the Lithium Lead Expansion Tank Room (11-B4-LL). Excluding these rooms the Collective Dose Index will be reduced. Moreover, it is expected thew the Colective Dose to the personel will be further reduced since all maintenance activities, at the equatorial port level, are planned to be performed using fully automated remote handling procedures for optimization of radiation protection,. This work contributes data in support to the effort to optimize occupational radiation protection at DEMO.
Main subject category:
Health Sciences
Keywords:
Tokamak, Fusion, Radiological risks, Operational radiation exposure, Collective dose
