CSNI0062 BETHSY/9.1B.
BETHSY/9.1B, Cold Leg Break Test
NAME OR DESIGNATION, COMPUTER, TEST FACILITY, TEST, PHENOMENA TESTED, STATUS, REFERENCES, TEST DESIGNATION, LANGUAGE, ESTABLISHMENT, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| BETHSY/9.1B | CSNI0062/01 | Report | 01-MAR-1990 |
Machines used:
No item found
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3. TEST FACILITY
The BETHSY integral test facility located in the Nuclear Research Center in Grenoble (France) is a scaled down model of a 3 loop 900 eMW FRAMATOME PWR; the overall scaling factor applied to every volume, mass flowrate and power level is close to 1/100, while elevations are 1/1 in order to preserve the gravitational heads.
The BETHSY integral test facility located in the Nuclear Research Center in Grenoble (France) is a scaled down model of a 3 loop 900 eMW FRAMATOME PWR; the overall scaling factor applied to every volume, mass flowrate and power level is close to 1/100, while elevations are 1/1 in order to preserve the gravitational heads.
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4. TEST
The BETHSY test 9.1b (performed in December 1989) involves 2" cold leg break, combined with the High Pressure Injection System (HPIS) failure. In that case, the state oriented approach requires operators to start an Ultimate Procedure, which consists in fully opening the Steam Generator (SG) atmospheric dumps as soon as they are informed of the unavailability of the HPIS. The presently studied scenario assumes a delayed application of this procedure, which is started only when the core outlet temperature rises significantly higher than the saturation temperature.
The BETHSY test 9.1b (performed in December 1989) involves 2" cold leg break, combined with the High Pressure Injection System (HPIS) failure. In that case, the state oriented approach requires operators to start an Ultimate Procedure, which consists in fully opening the Steam Generator (SG) atmospheric dumps as soon as they are informed of the unavailability of the HPIS. The presently studied scenario assumes a delayed application of this procedure, which is started only when the core outlet temperature rises significantly higher than the saturation temperature.
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6. PHENOMENA TESTED
The BETHSY program aims to contribute to validating CATHARE safety code and to check the relevance of the physical bases of the Emergency Operating Procedures (EOP).
Test 9.1b addresses, besides typical problems relevant to Small Break Loss Of Coolant Accidents (SBLOCA) such as critical 2-phase flow, loop seal clearing, heat-transfer during boil-off or accumulator injection, specific aspects related to the fast depressurization (primary to secondary and structural heat transfer), uncovered core behavior when intense condensation takes place in the SG, and primary side refilling by the Low Pressure Injection System (LPIS).
The BETHSY program aims to contribute to validating CATHARE safety code and to check the relevance of the physical bases of the Emergency Operating Procedures (EOP).
Test 9.1b addresses, besides typical problems relevant to Small Break Loss Of Coolant Accidents (SBLOCA) such as critical 2-phase flow, loop seal clearing, heat-transfer during boil-off or accumulator injection, specific aspects related to the fast depressurization (primary to secondary and structural heat transfer), uncovered core behavior when intense condensation takes place in the SG, and primary side refilling by the Low Pressure Injection System (LPIS).
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CSNI0062/01, included references:
- OECD/NEA/CSNI International Standard Problem No.27BETHSY Experiment 9.1B 2" Cold Leg Break without HPSI and with
Delayed Ultimate Procedure
Comparison Report Volume 1 and 2 (NEA/CSNI/R(R92)20) November 1992
- BETHSY General Description
Note SETh/LES/90-97 (Avril 1990)
- Ph. Gully and R. Deruaz
BETHSY Measurement System
Note SETh/LES/87-27 (Oct. 87)
- BETHSY Measurement System
Up-dating (April 1990) of report SETh/LES/87-27
- P. Bazin:
BETHSY: Data Base
Note SETh/LES/87-28 (Mars 1988)
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Keywords: data, loss-of-coolant accident, transients.