Caple AUF900 Manual de usuario descargar pdf (Pagina 239)

237

ENSI Erfahrungs- und Forschungsbericht 2011

Author und Co-author(s) T. Lind, D. Suckow, A. Dehbi, S. Güntay, S. Danner,

S. Deshpande

Institution Paul Scherrer Institut

Address 5232 Villigen PSI, Switzerland

Tel., E-mail, Internet address +41 (0)56 310 21 11, terttaliisa.l[email protected], www.psi.ch

Duration of project September 1, 2008 to August 31, 2011

ABSTRACT

A steam generator tube rupture (SGTR) in a

pressurized water reactor (PWR) has a poten-

tial of causing release of radioactivity into the

environment due to the possibility of the ra-

dionuclides by-passing the containment. The

release may take place as droplets of primary

coolant containing dissolved iodine during de-

sign basis accident phase, or as aerosols (par-

ticles and gas phase compounds) containing

fission products if the accident develops into a

severe accident.

For severe accidents, generally, no credit is

taken for the retention of aerosols inside the

steam generator, and consequently, the re-

lease fraction of the activity associated with

SGTR may be overestimated. In addition, un-

der design basis accident conditions in the dry

steam generator secondary side with no recir-

culation, no data exist for droplet retention.

Therefore, no retention of radioactivity in the

steam generator secondary side may be ac-

counted for under these conditions.

Based on the need for aerosol and droplet re-

tention data during a Steam Generator Tube

Rupture (SGTR) accident, Paul Scherrer Insti-

tut (PSI) established an international cost share

project called Aerosol Trapping In a Steam

Generator (ARTIST), with a continuation proj-

ect ARTIST II. In ARTIST II, experimental and

analytical work were carried out to comple-

ment the work carried out in ARTIST. The main

topics of ARTIST II were:

❚ determination of aerosol retention in the

break vicinity where most of the retention

takes place

❚ determination of the aerosol retention in

the flooded steam generator secondary side,

and improvement of the existing models for

pool scrubbing to be applicable to flooded

bundle conditions

❚ determination of the droplet retention in the

steam generator dryer and the effect of the

droplet size on retention.

In addition, several topics were investigated

as PhD work: i) determination of particle ag-

glomerate break-up upon impaction, ii) parti-

cle transport in turbulence, both analytical and

experimental approaches, and iii) determina-

tion of flow hydrodynamics in tube bundles.

In this report, we present the main conclusions

from the ARTIST II project.

ARTIST II

Aerosol Trapping in the Steam Generator

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