CSNI1018: IVO-THERMAL MIXING, study mixing of emergency cooling water with primary water during LOCA accident

OECD Nuclear Energy Agency / L'Agence pour l'énergie nucléaire

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CSNI1018 IVO-THERMAL-MIXING. (Abstract last modified 15-DEC-1999)

IVO-THERMAL MIXING, study mixing of emergency cooling water with primary water during LOCA accident

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OF EXPERIMENT - IVO-THERMAL-MIXING.

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-THERMAL-MIXING CSNI1018/01 Arrived

Machines used: Package-ID Orig.Computer Test Computer CSNI1018/01 Many Computers

3. DESCRIPTION OF TEST FACILITY - The test facility was originally designed to model the Finnish Loviisa plant but it was redesigned and modified for this test programme. The facility can be operated at atmospheric pressure with loop and high pressure injection flows from different cold legs in the area of interest to the pressurized thermal shock.
The test facility was initially constructed as a 1 to 2.56 scale model of the Loviisa VVER-440 reactor. The facility contains a half of the circumference of the reactor downcomer made of acrylic plastic. The downcomer is semiannular in shape.

4. DESCRIPTION OF TESTS -
In 1985 model tests were performed at the Hydraulic Laboratory of Imatran Voima Oy in Finland to study mixing of emergency cooling water with primary water in the USNRC-IVO downcomer during a postulated loss-of-coolant accident. The test matrix consists of 20 tests. The varied parameters were flow rates and the number and configuration of cold legs with high-pressure injection and loop flows. Four tests were done with decreasing loop flow temperature to simulate primary flows during steam line breaks.
Transparent materials were used to allow flow visualization during the tests. The choice of transparent materials limits the upper temperature to 75 deg.C. The fuel buoyancy effect was induced by salt addition and the high-pressure injection temperature was used as a tracer.

6. PHENOMENA TESTED - Study mixing of emergency cooling water with primary water in a semiannular downcomer during a postulated loss-of-coolant accident, with interacting flows from cold legs.

7. SPECIAL FEATURES OF EXPERIMENTS -

8. COUNTERPART EXPERIMENTS -

9. STATUS
CSNI1018/01: 15-DEC-1999 Arrived at NEADB

10. REFERENCES -
CSNI1018/01:
- Harri Tuomisto and Pertti Mustonen:
Thermal mixing tests in a semiannular downcomer with interacting flows from
cold legs, IVO Report RLB 340
- Additional fluid and thermal mixing tests in the USNRC-IVO downcomer
IVO Report RLB 341

11. TEST DESIGNATION - Thermal-mixing.

12. PROGRAMMING LANGUAGE -CSNI1018/01:

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

16. MATERIAL AVAILABLE -CSNI1018/01:
FORTUM presentation (Powerpoint)
60 and 80 temperature channels in degree Celsius (ASCII and Excel format)
Documentation in electronic format

17. CATEGORIES -

- Y. Integral Experiments Data, Databases, Benchmarks

Keywords: DATA, DOWNCOMER, LOSS-OF-COOLANT ACCIDENT, THERMAL MIXING

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