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Relap5/Mod3.1 analysis of main steam header rupture in VVER- 440/213 NPP

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Abstract

The presentation is focused on two main topics. First the applied modelling of PGV-4 steam generator for RELAP5 code are described. The results of steady-state calculation under reference conditions are compared against measured data. The problem of longitudinal subdivision of SG tubes is analysed and evaluated. Secondly, a best-estimate analysis of main steam header (MSH) rupture accident in WWER-440/213 NPP is presented. The low reliability of initiation of ESFAS signal `MSH Rupture` leads in this accident to big loss of secondary coolant, full depressurization of main steam system, extremely fast cool-down of both secondary and primary system, opening of PRZ SV-bypass valve with later liquid outflow, potential reaching of secondary criticality by failure of HPIS. 7 refs.
Authors:
Kral, P [1] 
  1. Nuclear Research Inst. Rez (Switzerland)
Publication Date:
Dec 31, 1995
Product Type:
Conference
Report Number:
LTKK-TJ-43; CONF-9410509-
Reference Number:
SCA: 210200; PA: AIX-29:032374; EDB-98:066371; SN: 98001970781
Resource Relation:
Conference: 3. international seminar on horizontal steam generators, Lappeenranta (Finland), 18-20 Oct 1994; Other Information: DN: 7 refs.; PBD: 1995; Related Information: Is Part Of Third international seminar on horizontal steam generators; PB: 430 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; COMPUTERIZED SIMULATION; FEEDWATER; LOSS OF COOLANT; R CODES; RUPTURES; SAFETY; STEAM GENERATORS; WWER TYPE REACTORS
OSTI ID:
614752
Research Organizations:
Lappeenranta Univ. of Technology (Finland).
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE98626444; ISBN 951-763-942-2; TRN: FI9800090032374
Availability:
INIS; OSTI as DE98626444
Submitting Site:
FIN
Size:
pp. 326-361
Announcement Date:
Jun 26, 1998

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Citation Formats

Kral, P. Relap5/Mod3.1 analysis of main steam header rupture in VVER- 440/213 NPP. Finland: N. p., 1995. Web.
Kral, P. Relap5/Mod3.1 analysis of main steam header rupture in VVER- 440/213 NPP. Finland.
Kral, P. 1995. "Relap5/Mod3.1 analysis of main steam header rupture in VVER- 440/213 NPP." Finland.
@misc{etde_614752,
title = {Relap5/Mod3.1 analysis of main steam header rupture in VVER- 440/213 NPP}
 author = {Kral, P}
 abstractNote = {The presentation is focused on two main topics. First the applied modelling of PGV-4 steam generator for RELAP5 code are described. The results of steady-state calculation under reference conditions are compared against measured data. The problem of longitudinal subdivision of SG tubes is analysed and evaluated. Secondly, a best-estimate analysis of main steam header (MSH) rupture accident in WWER-440/213 NPP is presented. The low reliability of initiation of ESFAS signal `MSH Rupture` leads in this accident to big loss of secondary coolant, full depressurization of main steam system, extremely fast cool-down of both secondary and primary system, opening of PRZ SV-bypass valve with later liquid outflow, potential reaching of secondary criticality by failure of HPIS. 7 refs.}
 place = {Finland}
 year = {1995}
 month = {Dec}
 }