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PPOOLEX experiments with two parallel blowdown pipes

Abstract

This report summarizes the results of the experiments with two transparent blowdown pipes carried out with the scaled down PPOOLEX test facility designed and constructed at Lappeenranta University of Technology. Steam was blown into the dry well compartment and from there through either one or two vertical transparent blowdown pipes to the condensation pool. Five experiments with one pipe and six with two parallel pipes were carried out. The main purpose of the experiments was to study loads caused by chugging (rapid condensation) while steam is discharged into the condensation pool filled with sub-cooled water. The PPOOLEX test facility is a closed stainless steel vessel divided into two compartments, dry well and wet well. In the experiments the initial temperature of the condensation pool water varied from 12 deg. C to 55 deg. C, the steam flow rate from 40 g/s to 1 300 g/s and the temperature of incoming steam from 120 deg. C to 185 deg. C. In the experiments with only one transparent blowdown pipe chugging phenomenon didn't occur as intensified as in the preceding experiments carried out with a DN200 stainless steel pipe. With the steel blowdown pipe even 10 times higher pressure pulses were registered  More>>
Authors:
Laine, J; Puustinen, M; Raesaenen, A [1] 
  1. Lappeenranta Univ. of Technology, Nuclear Safety Research Unit (Finland)
Publication Date:
Jan 15, 2011
Product Type:
Technical Report
Report Number:
NKS-234
Resource Relation:
Other Information: NKS-R-POOL; 13 refs., 46 ills., 22 tabs.
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; REACTOR SAFETY EXPERIMENTS; BLOWDOWN; COOLING PONDS; VAPOR CONDENSATION; PRESSURE DEPENDENCE; PIPES; DYNAMIC LOADS
OSTI ID:
1008039
Research Organizations:
Nordisk Kernesikkerhedsforskning, Roskilde (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ISBN 978-87-7893-306-5; TRN: DK1102012
Availability:
Also available at http://www.risoe.dtu.dk/rispubl/NKS/NKS-234.pdf; OSTI as DE01008039
Submitting Site:
DKN
Size:
52 p. pages
Announcement Date:
Mar 14, 2011

Citation Formats

Laine, J, Puustinen, M, and Raesaenen, A. PPOOLEX experiments with two parallel blowdown pipes. Denmark: N. p., 2011. Web.
Laine, J, Puustinen, M, & Raesaenen, A. PPOOLEX experiments with two parallel blowdown pipes. Denmark.
Laine, J, Puustinen, M, and Raesaenen, A. 2011. "PPOOLEX experiments with two parallel blowdown pipes." Denmark.
@misc{etde_1008039,
title = {PPOOLEX experiments with two parallel blowdown pipes}
author = {Laine, J, Puustinen, M, and Raesaenen, A}
abstractNote = {This report summarizes the results of the experiments with two transparent blowdown pipes carried out with the scaled down PPOOLEX test facility designed and constructed at Lappeenranta University of Technology. Steam was blown into the dry well compartment and from there through either one or two vertical transparent blowdown pipes to the condensation pool. Five experiments with one pipe and six with two parallel pipes were carried out. The main purpose of the experiments was to study loads caused by chugging (rapid condensation) while steam is discharged into the condensation pool filled with sub-cooled water. The PPOOLEX test facility is a closed stainless steel vessel divided into two compartments, dry well and wet well. In the experiments the initial temperature of the condensation pool water varied from 12 deg. C to 55 deg. C, the steam flow rate from 40 g/s to 1 300 g/s and the temperature of incoming steam from 120 deg. C to 185 deg. C. In the experiments with only one transparent blowdown pipe chugging phenomenon didn't occur as intensified as in the preceding experiments carried out with a DN200 stainless steel pipe. With the steel blowdown pipe even 10 times higher pressure pulses were registered inside the pipe. Meanwhile, loads registered in the pool didn't indicate significant differences between the steel and polycarbonate pipe experiments. In the experiments with two transparent blowdown pipes, the steamwater interface moved almost synchronously up and down inside both pipes. Chugging was stronger than in the one pipe experiments and even two times higher loads were measured inside the pipes. The loads at the blowdown pipe outlet were approximately the same as in the one pipe cases. Other registered loads around the pool were about 50-100 % higher than with one pipe. The experiments with two parallel blowdown pipes gave contradictory results compared to the earlier studies dealing with chugging loads in case of multiple pipes. Contributing factors to this may be the smaller dry well volume per blowdown pipe ratio and the lack of dry well internal structures in the PPOOLEX facility. Furthermore, the pipe material seemed to have an effect on the condensation process inside the pipe. Polycarbonate has two orders of magnitude smaller thermal conductivity than steel. (Author)}
place = {Denmark}
year = {2011}
month = {Jan}
}