The document deals with the description of results obtained by the Relap5 code in the pretest-blind simulation of the reflood phase of a LOCA experiment performed in the Pressurized Water Reactor (PWR) experimental simulator Achilles installed at the Winfrith Research Center in United Kingdom. The Relap5 is the well-known computer code developed at Idaho National Laboratory in US: the code is in use at UNIPI since more than a decade. The Achilles loop is a Separate Effect Test Facility (SETF) simulating with full height (full pressure), full linear power a US type PWR. The concerned test was selected as International Standard Problem 25 (ISP 25) by OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Enrgy Agency / Committee on the Safety of Nucear Installations). The document describes the results of the pre-test calculation submitted (by UNIPI) to UKAEA (UK Atomic Energy Agency) before the execution of the test. This is called blind-pre-test analysis: the comparison of about 30 calculated time trends with measured data (once the experiment is performed: this is part of the ISP documentation issued as OECD report) allows an objective evaluation of the capabilities of the computer code and of the code user team in predicting the scenario of an accident. This is relevant for demonstrating the capabilities in evaluating safety margins of existing NPP, with main reference to PWR reflood (in this case).
D'Auria F., De Pasquale F., De Varti A., Fruttuoso G., "OECD CSNI ISP 25, Achilles test A1B105: pre-test analysis performed at Pisa University by Relap5/mod2 code and comparison with experimental data, OECD CSNI Workshop on ISP 25, Winfrith (UK), Nov. 27-29, 1989
D'Auria F.
Primo
Conceptualization
;
1989-01-01
Abstract
The document deals with the description of results obtained by the Relap5 code in the pretest-blind simulation of the reflood phase of a LOCA experiment performed in the Pressurized Water Reactor (PWR) experimental simulator Achilles installed at the Winfrith Research Center in United Kingdom. The Relap5 is the well-known computer code developed at Idaho National Laboratory in US: the code is in use at UNIPI since more than a decade. The Achilles loop is a Separate Effect Test Facility (SETF) simulating with full height (full pressure), full linear power a US type PWR. The concerned test was selected as International Standard Problem 25 (ISP 25) by OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Enrgy Agency / Committee on the Safety of Nucear Installations). The document describes the results of the pre-test calculation submitted (by UNIPI) to UKAEA (UK Atomic Energy Agency) before the execution of the test. This is called blind-pre-test analysis: the comparison of about 30 calculated time trends with measured data (once the experiment is performed: this is part of the ISP documentation issued as OECD report) allows an objective evaluation of the capabilities of the computer code and of the code user team in predicting the scenario of an accident. This is relevant for demonstrating the capabilities in evaluating safety margins of existing NPP, with main reference to PWR reflood (in this case).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
