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[Program Service | Recent programs]

CSNI1027 IVO/LOOP-SEAL. (Abstract last modified 01-JAN-1988)


IVO-Loop Seal Facility (Air/Water), Two-phase behaviour of a PWR cold leg loop seal during LOCA accidents

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OF EXPERIMENT - IVO/LOOP-SEAL AIR/WATER.


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
IVO/LOOP-SEAL        CSNI1027/01 Report

Machines used:
Package-ID     Orig.Computer                       Test Computer
CSNI1027/01    Many Computers                      

3. DESCRIPTION OF TEST FACILITY ¿ The experimental facility is a full-scale model of one entire cold leg. The steam flow is modelled with atmospheric air flow delivered by the high-capacity fan (3 m3/s with a head of 30 kPa). The maximum available superficial air velocity is 9 m/s in the cold leg with a diameter of 850 mm. The opening simulates a break in the long horizontal section between the RCP and the reactor pressure vessel (RPV). The RCP mock-up has been designed to give a similar flow behaviour: the overflow edge and the single-phase pressure drop are equal to those of the real RCP. The break location can be varied to simulate a botton, side or top break. The speed-controlled air fan has a buffer tank (10 m3) and throttling for the control of oscillations. Make-up water can be injected into the loop seal section with a maximum flow rate of 30 kg/s.
The measuring system records the pressures p1 and p2, and the air and make-up water flow rates. The differential pressure measurements in the horizontal section of the loop seal give average void fractions (or level values of the stratified flow).


4. DESCRIPTION OF TESTS ¿ Three separate air/water test series were performed to determine the onset of slugging in the horizontal pipe, the residual water mass and the total two-phase drop in the loop seal. The results of flow regime transition experiments have been compared with smaller-scale experiments and with theoretical predictions to evaluate scaling criteria. The strong hysteresis of transitions found between the stratified and slug flow regimes depends on the loope seal geometry and U-tube oscillations.


6. PHENOMENA TESTED ¿ Study two-phase of a PWR cold leg loop seal during loss-of-cooland accidents.


9. STATUS
CSNI1027/01: 01-JAN-1988 Report Only


10. REFERENCES  - 
CSNI1027/01:
- Harri Tuomisto and Pirjo Kajanto
Two-Phase Flow in a Full-Scale Loop Seal Facility
Nuclear Engineering and Design 107 (1988) 295-305


11. TEST DESIGNATION ¿ Loop seal air/water.


12. PROGRAMMING LANGUAGE -CSNI1027/01: 


15. ESTABLISHMENT - 
Imatran Voima Oy
Power Plant Division
Helsinki, Finland


16. MATERIAL AVAILABLE -CSNI1027/01:
Documentation in electronic format


17. CATEGORIES  - 

- Y. Integral Experiments Data, Databases, Benchmarks


Keywords: AIR, LOOP, LOSS-OF-COOLANT ACCIDENT, PWR REACTORS, WATER

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