CSNI0062 BETHSY/9.1B.

BETHSY/9.1B, Cold Leg Break Test

NAME OF EXPERIMENT, COMPUTER, DESCRIPTION OF TEST FACILITY, DESCRIPTION OF TEST, PHENOMENA TESTED, STATUS, REFERENCES, TEST DESIGNATION, LANGUAGE, ESTABLISHMENT, MATERIAL, CATEGORIES

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1. NAME OF EXPERIMENT: BETHSY/9.1B.

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2. COMPUTERS

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Program name	Package id	Status	Status date
BETHSY/9.1B	CSNI0062/01	Report	01-MAR-1990

Machines used:

No specified machine

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3. DESCRIPTION OF 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.

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4. DESCRIPTION OF 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.

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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).

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9. STATUS

Package ID	Status date	Status
CSNI0062/01	01-MAR-1990	Report Only

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10. REFERENCES

CSNI0062/01, included references:

- OECD/NEA/CSNI International Standard Problem No.27
BETHSY 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, Updating (April 1990) of report SETh/LES/87-27
- P. Bazin:
BETHSY: Data Base, Note SETh/LES/87-28 (Mars 1988)

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11. TEST DESIGNATION: 9.1B

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12. PROGRAMMING LANGUAGE(S) USED

No specified programming language

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15. ESTABLISHMENT

Programme sponsored by:
the Commissariat a l'Energie Atomique
Electricite de France
Framatome

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16. MATERIAL AVAILABLE

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17. CATEGORIES