As a follow-up of the ISP 21 activity (see below for details and nomenclature), a new experiment was performed in PIPER-ONE loop, where the capabilities of the facility were exploited. The new experiment was called PO-SB-7c and was similar to the experiment at the basis of ISP 21, but the cooling coils were active to remove the heat stored in the passive structures (part of it) and to make the experimental scenario closer to the scenario expected in the prototype BWR. The experiment was unique within the international community, i.e. considering all the ITF available in the world and the related test programmes. The report deals with the comparison between the measured quantities and the calculated quantities and shows the expected benefits in adopting the cooling coils. Additional information and nomenclature Following the ISP [see below for acronyms] proposal made by UNIPI to OECD/NEA/CSNI in 1985[proposal given below under quotation] and the first ISP 21 Workshop held in Marina di Grosseto, 1986, the second and final Workshop for the international activity was held in Calci (Pisa geographical region) in 1989. “The document deals with the proposal made by UNIPI to the OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Energy Agency / Committee on the Safety of Nuclear Installations) to perform an International Standard Problem (ISP), which was, later on, called ISP 21. This was at the time the first ISP proposed by Italian Institutions dealing with an Integral Test Facility (ITF). ISP 21 was a Small Break Loss of Coolant Accident (SBLOCA) scenario expected to occur in Boiling Water Reactors. One key feature of the proposed experiment was its Counterpart-Test feature which allowed the comparison with similar experiments performed in the FIST facility (available in US, San Jose, General Electric) and the ROSA-III facility (available in Japan at the JAERI research center of Tokai-Mura). The proposal was accepted and the ISP activity went on in the period 1985-1989. (Later) comparison between experimental scenarios in the three ITF PIPER-ONE, ROSA-III and FIST largely contribute to addressing the scaling issue which was controversial in nuclear thermal-hydraulics. PIPER-ONE was a Boiling Water Reactor (BWR) simulator installed at the Scalbatraio Laboratory managed by Dipartimento di Costruzioni Meccaniche e Nucleari (DCMN, now DICI) of University of Pisa.” Four reports are part of this collection. This report (4 of 4) discusses the application of the FFTBM (Fast Fourier Transform Based Method developed at UNIPI since a few years) to the comparison between PIPER-ONE experiment at the basis of ISP 21 and calculated data by each participant in the activity. In this way a hierarchy of quality of calculation was made. The activity (among the other things) allowed UNIPI understanding of the capabilities of international Institutions in predicting accident scenarios in NPP.
PIPER-ONE test PO-SB-7c: post-test analysis performed by RELAP5/MOD2 code
D'Auria F.
Primo
Methodology
;
1989-01-01
Abstract
As a follow-up of the ISP 21 activity (see below for details and nomenclature), a new experiment was performed in PIPER-ONE loop, where the capabilities of the facility were exploited. The new experiment was called PO-SB-7c and was similar to the experiment at the basis of ISP 21, but the cooling coils were active to remove the heat stored in the passive structures (part of it) and to make the experimental scenario closer to the scenario expected in the prototype BWR. The experiment was unique within the international community, i.e. considering all the ITF available in the world and the related test programmes. The report deals with the comparison between the measured quantities and the calculated quantities and shows the expected benefits in adopting the cooling coils. Additional information and nomenclature Following the ISP [see below for acronyms] proposal made by UNIPI to OECD/NEA/CSNI in 1985[proposal given below under quotation] and the first ISP 21 Workshop held in Marina di Grosseto, 1986, the second and final Workshop for the international activity was held in Calci (Pisa geographical region) in 1989. “The document deals with the proposal made by UNIPI to the OECD/NEA/CSNI (Organization for Economic Cooperation and Development / Nuclear Energy Agency / Committee on the Safety of Nuclear Installations) to perform an International Standard Problem (ISP), which was, later on, called ISP 21. This was at the time the first ISP proposed by Italian Institutions dealing with an Integral Test Facility (ITF). ISP 21 was a Small Break Loss of Coolant Accident (SBLOCA) scenario expected to occur in Boiling Water Reactors. One key feature of the proposed experiment was its Counterpart-Test feature which allowed the comparison with similar experiments performed in the FIST facility (available in US, San Jose, General Electric) and the ROSA-III facility (available in Japan at the JAERI research center of Tokai-Mura). The proposal was accepted and the ISP activity went on in the period 1985-1989. (Later) comparison between experimental scenarios in the three ITF PIPER-ONE, ROSA-III and FIST largely contribute to addressing the scaling issue which was controversial in nuclear thermal-hydraulics. PIPER-ONE was a Boiling Water Reactor (BWR) simulator installed at the Scalbatraio Laboratory managed by Dipartimento di Costruzioni Meccaniche e Nucleari (DCMN, now DICI) of University of Pisa.” Four reports are part of this collection. This report (4 of 4) discusses the application of the FFTBM (Fast Fourier Transform Based Method developed at UNIPI since a few years) to the comparison between PIPER-ONE experiment at the basis of ISP 21 and calculated data by each participant in the activity. In this way a hierarchy of quality of calculation was made. The activity (among the other things) allowed UNIPI understanding of the capabilities of international Institutions in predicting accident scenarios in NPP.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
