Use of the Natural Circulation Flow Map for Natural Circulation Systems Evaluation

Cherubini, M.; Giannotti, W.; Araneo, Diego Christian; D'Auria, Francesco Saverio

doi:10.1155/2008/479673

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…The Natural circulation mechanism could be used for the residual heat removal and safety systems or depend on reactor design, at the naturally driven systems at the normal and other operational conditions. The primary flow NC pattern is categorized to Single Phase NC (SPNC), Two-Phase NC (TPNC), Siphon Condensation NC (SCNC), Reflux Condensation NC (RCNC), and finally, the dry-out occurs [1,7]. The NC flow regimes are illustrated in Fig.…”

Section: Natural Circulation Phenomena Natural Circulation Flow Regimesmentioning

confidence: 99%

Investigation of the Natural Circulation FlowMap in NuScale Small Modular Reactor

Hosseini

Akbari

Shirani

et al. 2021

IJRRS

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Natural Circulation (NC) is an important mechanism in several industrial systems, and knowledge of its behavior is of interest to nuclear reactor design, operation and safety. The main safety issue in present nuclear reactors is to ensure the sufficient removal of decay heat during accidents. Recently, Small Modular Reactors (SMRs) have increasingly received a lot of positive attention and even several types of these reactors are in different stages of design and construction. Some of these SMRs, such as NuScale, are designed to operate in full NC mode as the main mechanism of the primary coolant drive force for heat removal from the reactor core during normal operation. The present study deals with the Natural Circulation Flow Map (NCFM) investigation in the NuScale reactor as one of the SMRs that operate in full NC mode. At first, NuScale reactor elements are modeled with RELAP5 thermal-hydraulic code. Then, after the verification of the steady-state modeling, the operational point of the NuScale reactor is indicated in NCFM that is based on the database of different PWR simulators (gathered from the experimental test facilities). The evaluation of Natural Circulation Performance (NCP) of this reactor has proved the good design of NCP during normal operation in comparing typical PWRs operations in high power cases.

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Section: Natural Circulation Phenomena Natural Circulation Flow Regimesmentioning

confidence: 99%

Investigation of the Natural Circulation FlowMap in NuScale Small Modular Reactor

Hosseini

Akbari

Shirani

et al. 2021

IJRRS

View full text Add to dashboard Cite

show abstract

“…One of the most representative examples is the variety of experiments on natural circulation (NC) behavior performed in all major ITFs aimed at commissioning the facility and characterizing the phenomenon. The results of these tests have served to build an NC flow map (core inlet flow rate/core power Vs primary system inventory/volume) and an envelope to predict NC situations in a typical PWR [5]. Most counterpart tests have been focused on the study of experiments that meet these characteristics.…”

Section: Introductionmentioning

confidence: 99%