Caple AUF900 Instrukcja Użytkownika Pobierz pdf (Strona 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

1 2 ... 234 235 236 237 238 239 240 241 242 243 244 ... 303 304

Komentarze do niniejszej Instrukcji

Brak uwag

Caple AUF900 Instrukcja Użytkownika Strona 239

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Nie Caple AUF900