Decay heat removal for LMFR under accidents

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Nuclear reactors of “Proryv” project are positioned as the basis for large scale nuclear energetics with inherent safety, which in particular means “eliminating accident at NPP that require evacuation let alone resettlement of population”, which includes cases of multiple malfunctions. The decay heat removal from the reactor core and prevention of the fuel pins overheating is one of first key questions of safety justification problem. On the base of parametric study using engineering thermal-hydraulics code it is shown how to advance efficiency of decay heat removal through modification of reactor upper plenum design.

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作者简介

V. Rachkov

JSC “PRORYV”

编辑信件的主要联系方式.
Email: rvi@pnproryv.ru
俄罗斯联邦, Moscow

Yu. Khomyakov

JSC “PRORYV”

Email: rvi@pnproryv.ru
俄罗斯联邦, Moscow

Yu. Shvetsov

JSC “PRORYV”

Email: rvi@pnproryv.ru
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Sodium circulation diagram in the reactor in cooldown mode according to the DRACS scheme: 1 – active zone; 2 – intermediate heat exchanger; 3 – 1st circuit circulation pump; 4 – control and protection system column; 5 – emergency heat exchanger.

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3. Fig. 2. Vertical (a) and horizontal (b) sections of the reactor calculation region.

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4. Fig. 3. Dynamics of the main circulation pump pressure and flow rate in the 1st circuit (a) and the maximum temperature of the fuel element cladding (b) during the transition to the cooldown mode.

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5. Fig. 4. Location of the ATO drain chamber.

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6. Fig. 5. Dynamics of the maximum fuel element cladding temperature (a) and flow rate in the 1st circuit (b) for different values ​​of the dividing partition height.

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7. Fig. 6. Dependence of the relative sodium consumption through the PTO (a) and the total “overturning” consumption through the fuel assembly (b) on the height of the dividing partition.

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8. Fig. 7. Lifting GIWS28up and lowering GIWS28d flows through the MPP at the level of the upper end of the “active zone”.

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9. Fig. 8. Dependence of the maximum fuel element cladding temperature on the height of the dividing partition.

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10. Fig. 9. Dynamics of the maximum fuel cladding temperature for different ESR design options.

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