CSNI1026 ERSEC.

1. NAME OF EXPERIMENT:  ERSEC - Reflooding of heated tube.

3. DESCRIPTION OF TEST FACILITY

ERSEC loop in Grenoble, France
- uniformly heated and internally cooled single tube installed in the ERSEC
- tube placed in a vacuum chamber with reflecting shield to reduce external heat losses
- constant operating conditions (flooding rate, subcooling of water and power generation)
- intial conditions: Pressure 0.3 MPa; Flooding rate 52 kg/m2 s; inlet water subcooling 23 K; Power 6.2 KW

4. DESCRIPTION OF TEST

Investigation of the thermal-hydraulics of the reflood phase of a loss of coolant accident.
  
Scaling Information:
- analytical experiment, two-phase thermal-hydraulic oriented exercise
- 0.3 MPa total pressure, assumed as constant
  
Parameters offered for Comparison:
- wall temperatures of tube at 4 distinct elevations versus time
- quench time at different elevations
- water entrainment at tube exit versus time
- steam temperature at tube exit versus time
  
Findings:
- experiment characterized by strong non-equilibrium effects(e.g. subcooled boiling and void formation)
- thermal equilibrium codes could not predict the measurements in all respects
- RELAP4-MOD 6 empiricism derived from bundle experiments not applicable for this internally cooled monotube experiment
- ISP 7 results not representative for capabilities to predict nuclear plant system behaviour

6. PHENOMENA TESTED

Investigation into the reflooding phase of a Loss of Coolant Accident.

- R. Deruaz, N. Tellier:
Comparison Report on OECD Standard Problem No. 7
Analyses of a Reflooding Experiment
CSNI Report No. 55 (June 1979)

11. TEST DESIGNATION:  Reflood of heated tube.

15. ESTABLISHMENT

Commissariat a l' Energie Atomique
IPSN Departement de Surete Nucleaire
Grenoble, France

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