Numerical simulation of hydrodynamic response of Mark I suppression pools. Key phase report. [VENT 3 code; SURGE code]
EPRI is currently sponsoring several programs to quantify the loads in a Mark I containment system during postulated loss of coolant accident. This program will develop and verify by comparison with experimental data, numerical models to simulate pool swell. Currently, this program has produced two numerical models (codes) that together calculate the kinematics and the dynamics of the pool swell from the initial drywell pressurization to shortly after ringheader impact. Two codes were developed because two flow regimes were identified with the aid of laboratory observations: the distinctly three-dimensional flow field during and shortly after the vent-clearing process and the essentially two-dimensional flow in the intermediate and late stages of bubble growth. The VENT 3 code covers the period from the initial drywell pressurization to the time when water in the downcomer is completely expelled. In this code, the transient, three-dimensional nature of the flow is fully taken into account. In addition to supplying detailed dynamical information concerning the vent-clearing process, the VENT 3 code provides initial conditions, such as the time of vent clearing and the corresponding flow rate, to the transient, two-dimensional SURGE Code. The SURGE Code traces the evolution of the bubbles and hydrodynamics in the wetwell after vent clearing. The SURGE Code version described in this report (MOD 1) treats the air as an incompressible whereas a later report will describe MOD 2 SURGE Code, incorporating compressibility.
- Research Organization:
- JAYCOR, Del Mar, CA (USA)
- OSTI ID:
- 7123231
- Report Number(s):
- EPRI-NP-345; TRN: 77-007244
- Country of Publication:
- United States
- Language:
- English
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PRESSURE SUPPRESSION
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