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Assessment of RELAP5/MOD2, Cycle 36.02, using NEPTUN reflooding experimental data. International code assessment programme

Technical Report:

Abstract

Seven NEPTUN reflooding experiments with varying parameters flooding rate, single rod power, pressure and initial rod temperatures were simulated with the code RELAP5/MOD2, version 36.02, to assess the code, especially its reflood model. These calculations were performed with the specific objectives of evaluating the general prediction capability as well as specific problem areas of the RELAP5/Mod2 code in modelling boil-off and reflood behavior. First a study of the effect of the hydraulic and conduction nodalization to the results of the code was performed using a high and a low flooding rate experiment. After the choice of a proper nodalization, base calculations were done for all seven NEPTUN reflooding tests. The differences between code predictions and experiments are described and analysed. Implementing new correlations into the code and modifying or correcting existing correlations, for example for wall heat transfer or interphase friction, some of the weak points of the code during reflooding could be identified. These modifications were checked with all seven NEPTUN experiments. Additionally, two FLECHT-SEASET tests were simulated with the frozen version and also with the modifications mentioned above. (author) 60 figs., 4 tabs., 17 refs.
Authors:
Richner, M; Analytis, G T; Aksan, S N [1] 
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
PSI-104; NUREG/IA-00103.
Reference Number:
SCA: 420400; PA: AIX-23:011555; SN: 92000637955
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
42 ENGINEERING; REACTOR COOLING SYSTEMS; COMPUTERIZED SIMULATION; BOILING; CORRELATIONS; ERRORS; EXPERIMENTAL DATA; FRICTION; FUEL ELEMENT CLUSTERS; HEAT TRANSFER; HYDRAULICS; MESH GENERATION; MODIFICATIONS; NODAL EXPANSION METHOD; PRESSURE DEPENDENCE; R CODES; THEORETICAL DATA; THERMAL CONDUCTION; THERMODYNAMICS; 420400; HEAT TRANSFER AND FLUID FLOW
OSTI ID:
10111417
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92613719; TRN: CH9100668011555
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
98 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Richner, M, Analytis, G T, and Aksan, S N. Assessment of RELAP5/MOD2, Cycle 36.02, using NEPTUN reflooding experimental data. International code assessment programme. Switzerland: N. p., 1991. Web.
Richner, M, Analytis, G T, & Aksan, S N. Assessment of RELAP5/MOD2, Cycle 36.02, using NEPTUN reflooding experimental data. International code assessment programme. Switzerland.
Richner, M, Analytis, G T, and Aksan, S N. 1991. "Assessment of RELAP5/MOD2, Cycle 36.02, using NEPTUN reflooding experimental data. International code assessment programme." Switzerland.
@misc{etde_10111417,
title = {Assessment of RELAP5/MOD2, Cycle 36.02, using NEPTUN reflooding experimental data. International code assessment programme}
author = {Richner, M, Analytis, G T, and Aksan, S N}
abstractNote = {Seven NEPTUN reflooding experiments with varying parameters flooding rate, single rod power, pressure and initial rod temperatures were simulated with the code RELAP5/MOD2, version 36.02, to assess the code, especially its reflood model. These calculations were performed with the specific objectives of evaluating the general prediction capability as well as specific problem areas of the RELAP5/Mod2 code in modelling boil-off and reflood behavior. First a study of the effect of the hydraulic and conduction nodalization to the results of the code was performed using a high and a low flooding rate experiment. After the choice of a proper nodalization, base calculations were done for all seven NEPTUN reflooding tests. The differences between code predictions and experiments are described and analysed. Implementing new correlations into the code and modifying or correcting existing correlations, for example for wall heat transfer or interphase friction, some of the weak points of the code during reflooding could be identified. These modifications were checked with all seven NEPTUN experiments. Additionally, two FLECHT-SEASET tests were simulated with the frozen version and also with the modifications mentioned above. (author) 60 figs., 4 tabs., 17 refs.}
place = {Switzerland}
year = {1991}
month = {Oct}
}