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The role of fission gas in the analysis of hypothetical core disruptive accidents

Abstract

This paper summarizes recent work at Karlsruhe with the goal of understanding the effects of fission gas in hypothetical core disruptive accidents. The fission gas behavior model is discussed. The computer programs LANGZEIT and KURZZEIT describe the long-term and the transient gas behavior, respectively. Recent improvements in the modeling and a comparison of results with experimental data are reported. A somewhat detailed study of the role of fission gas in transient overpower (TOP) accidents was carried out. If pessimistic assumptions, like pin failure near the axial midplane are made, these accidents end in core disassembly. The codes HOPE and KADIS were used to analyze the initiating and the disassembly phase in these studies. Improvements of the codes are discussed. They include an automatic data transfer from HOPE to KADIS, and a new equation of state in KADIS, with an improved model for fission gas behavior. The analysis of a 15 cents/sec reactivity ramp accident is presented. Different pin failure criteria are used. In the cases selected, the codes predict an energetic disassembly. For the much discussed loss-of-flow driven TOP, detailed models are presently not available at Karlsruhe. Therefore, only a few comments and the results of a few scoping calculations  More>>
Authors:
Fischer, E A [1] 
  1. Gesellschaft fuer Kernforschung mbH, INR Kernforschungszentrum, Karlsruhe (Germany)
Publication Date:
Jul 01, 1977
Product Type:
Conference
Report Number:
IWGFR-19
Reference Number:
EDB-01:022307
Resource Relation:
Conference: IAEA-IWGFR specialists' meeting on role of fission products in whole core accidents, Harwell (United Kingdom), 28 Jun - 1 Jul 1977; Other Information: 17 refs, 6 figs, 4 tabs; Pages 77 and 79 are missing; PBD: 1977; Related Information: In: Specialists' meeting on role of fission products in whole core accidents, 88 pages.
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; CALCULATION METHODS; COMPUTER CODES; EXPERIMENTAL DATA; FISSION PRODUCTS; FUEL ELEMENT FAILURE; LOSS OF FLOW; REACTOR CORE DISRUPTION; TRANSIENT OVERPOWER ACCIDENTS
OSTI ID:
20139407
Research Organizations:
International Atomic Energy Agency, International Working Group on Fast Reactors, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA0100294008080
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 30-40
Announcement Date:

Citation Formats

Fischer, E A. The role of fission gas in the analysis of hypothetical core disruptive accidents. IAEA: N. p., 1977. Web.
Fischer, E A. The role of fission gas in the analysis of hypothetical core disruptive accidents. IAEA.
Fischer, E A. 1977. "The role of fission gas in the analysis of hypothetical core disruptive accidents." IAEA.
@misc{etde_20139407,
title = {The role of fission gas in the analysis of hypothetical core disruptive accidents}
author = {Fischer, E A}
abstractNote = {This paper summarizes recent work at Karlsruhe with the goal of understanding the effects of fission gas in hypothetical core disruptive accidents. The fission gas behavior model is discussed. The computer programs LANGZEIT and KURZZEIT describe the long-term and the transient gas behavior, respectively. Recent improvements in the modeling and a comparison of results with experimental data are reported. A somewhat detailed study of the role of fission gas in transient overpower (TOP) accidents was carried out. If pessimistic assumptions, like pin failure near the axial midplane are made, these accidents end in core disassembly. The codes HOPE and KADIS were used to analyze the initiating and the disassembly phase in these studies. Improvements of the codes are discussed. They include an automatic data transfer from HOPE to KADIS, and a new equation of state in KADIS, with an improved model for fission gas behavior. The analysis of a 15 cents/sec reactivity ramp accident is presented. Different pin failure criteria are used. In the cases selected, the codes predict an energetic disassembly. For the much discussed loss-of-flow driven TOP, detailed models are presently not available at Karlsruhe. Therefore, only a few comments and the results of a few scoping calculations will be presented.}
place = {IAEA}
year = {1977}
month = {Jul}
}