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Research Papers

Influence of Sump on Containment Thermal Hydraulics: Synthesis of the TOSQAN Tests

[+] Author and Article Information
Emmanuel Porcheron

Mem. ASME
Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
PSN-RES, SCA, Gif-sur-Yvette 91192, France
e-mail: emmanuel.porcheron@irsn.fr

Pascal Lemaitre

Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
PSN-RES, SCA, Gif-sur-Yvette 91192, France
e-mail: pascal.lemaitre@irsn.fr

Amandine Nuboer

Institut de Radioprotection et de Sûreté Nucléaire (IRSN),
PSN-RES, SCA, Gif-sur-Yvette 91192, France
e-mail: amandine.nuboer@irsn.fr

1Corresponding author.

Manuscript received October 17, 2014; final manuscript received June 26, 2015; published online September 3, 2015. Assoc. Editor: Xu Cheng.

ASME J of Nuclear Rad Sci 1(4), 041008 (Sep 03, 2015) (7 pages) Paper No: NERS-14-1053; doi: 10.1115/1.4030961 History: Received October 17, 2014; Accepted June 29, 2015; Online September 16, 2015

During the course of a severe accident in a nuclear power plant, water can be collected in the sump containment through steam condensation on walls, cooling circuit leak, and by spray systems activation. Therefore, the sump can become a place of heat and mass exchanges through water evaporation and steam condensation, which influences the distribution of hydrogen released in containment during nuclear core degradation. The objective of this paper is to present the analysis of semi-analytical experiments on sump interaction between containment atmosphere for typical accidental thermal hydraulic conditions in a pressurized water reactor (PWR). Tests are conducted in the TOSQAN facility developed by the Institut de Radioprotection et de Sûreté Nucléaire in Saclay. The TOSQAN facility is particularly well adapted to characterize the distribution of gases in a containment vessel. A tests’ grid was defined to investigate the coupled effect of the sump evaporation with wall condensation, for air steam conditions, with noncondensable gases (He, SF6), and for steady and transient states (two depressurization tests).

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References

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Figures

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Fig. 1

Description of the TOSQAN facility

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Fig. 2

Instrumentation location in the main vessel volume

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Fig. 3

TOSQAN sump description and instrumentation location

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Fig. 4

Reference Test 201: Repeatability of the time evolution of vessel pressure and mean gas temperature. The thermal resistance is activated at t=0  s

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Fig. 5

Reference Test 201: Time evolution of vessel relative pressure, mean gas temperature, and steam-wall condensation mass flow rate. The thermal resistance placed inside the sump is activated at t=0  s.

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Fig. 6

Reference Test 201: Time evolution of local gas temperature measured at different levels (the temperature value at each level is the average of the temperature values measured by all thermocouples placed at different radial locations)

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Fig. 7

Reference Test 201: Gas temperature field in the TOSQAN vessel (T, °C). t=−12,000  s (before steam injection)

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Fig. 8

Reference Test 201: Gas temperature field in the TOSQAN vessel (T, °C). t=−5000  s (first steady state of wall condensation)

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Fig. 9

Reference Test 201: Gas temperature field in the TOSQAN vessel (T, °C). t=0  s (end of sump filling)

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Fig. 10

Reference Test 201: Gas temperature field in the TOSQAN vessel (T, °C). t=13,000  s (second quasi-steady-state of wall condensation)

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Fig. 11

Reference Test 201: Evolution of the water temperature in the sump. Temperature measured on the vertical rod (see Fig. 3)

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Fig. 12

Test 204 (SF6): Time evolution of vessel pressure, mean gas temperature, and steam-wall condensation mass flow rate

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Fig. 13

Test 204 (SF6): Time evolution of gas volume concentrations

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Fig. 14

Test 205 (He): Time evolution of vessel relative pressure, mean gas temperature, and steam-wall condensation mass flow rate

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Fig. 15

Test 205 (He): Time evolution of gas volume concentrations

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Fig. 16

Test 206: Time evolution of mean gas temperature and relative pressure

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Fig. 17

Test 207: Time evolution of mean gas temperature and relative pressure

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Fig. 18

Test 206: Time evolution of steam concentration measured at Z5 level, at the center part of the vessel

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Fig. 19

Test 207: Time evolution of steam concentration measured at Z5 level, at the center part of the vessel

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Fig. 20

Test 206: Visualization of sump water (viewing window level, see Fig. 3) at t=16,000  s

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Fig. 21

Test 207: Visualization of sump water (viewing window level, see Fig. 3) at t=13,000 s 

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