| Autor: |
Ton Nghiem Huynh, Duong Tran Quoc, Vinh Vinh Le, Minh Tuan Nguyen, Duc Tu Dau, Cuong Nguyen Kien, Nam Bui Phuong |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Nuclear Science and Technology. 8:1-9 |
| ISSN: |
1810-5408 |
| Popis: |
The leakage from the reactor pool back into the dry irradiation channels due to corrosion or mechanics based reason is a postulated event that could occur under operating conditions of the Dalat nuclear research reactor (DNRR), especially the channel 7-1 which has been installed more than 30 years. When it occurs, the air space in these channels will be occupied by the water, subsequently a water column will appear in fuel region. The appearance of water column considerably enhances medium of neutron moderation for its surrounding fuel assemblies. As a result, a positive reactivity is inserted in the core and this event is classified as an insertion of excess reactivity. This event needs to be addressed by analysis and assessment from safety point of view and the results of analysis are also important for updating the reactor operating procedures. This paper presents assumptions, computer models and the results of analysis for such event in the DNRR by using MCNP5 code (code for neutronics analysis) and EUREKA-2/RR code (code for transient analysis). The calculation results include value of reactivity insertion, change in power of reactor, as well as surface temperature of the hottest fuel assembly. This research contributes to updating the reactor operating procedure. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
