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Assessment of ex-core neutron detectors in prototype Gen-IV sodium-cooled fast reactor (PGSFR)
- Source :
- Annals of Nuclear Energy. 126:110-121
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- This paper presents the assessment of the ex-core detectors in the Prototype Gen-IV Sodium-cooled Fast Reactor (PGSFR) in response to the movement of single primary control assembly, to evaluate the detectors’ locations and to determine a proper number of detectors. The detectors are located below the containment vessel and distributed in different ranges from the center and different azimuthal angles. Another position considered is in the radial direction of the core, at the sodium coolant gap between the outermost assembly and core shroud. To calculate the detection rate, the contribution of each fuel region to the detector and the core power distribution are required. Initially, the aforementioned contribution is generated by performing a continuous-energy forward fixed-source Monte Carlo calculation using MCNPX. The reactor kinetics code FREK simulates the power change due to an inadvertent withdrawal of a primary control assembly up to 10% from its critical position followed by full insertion of secondary control assemblies. The response from each detector location was evaluated, and consequently, the detectors located below the containment vessel, which can “see” all the fuel assemblies, responded better to the core power increase with a minor error of less than ∼0.6%. In addition, the impact of locating the detector below the containment vessel at different locations from the center or at different azimuthal angles was insignificant but several detectors should be distributed at even azimuthal angles for effective core monitoring and redundancy purposes.
- Subjects :
- Materials science
020209 energy
Nuclear engineering
Detector
Monte Carlo method
02 engineering and technology
equipment and supplies
01 natural sciences
010305 fluids & plasmas
Coolant
Azimuth
Sodium-cooled fast reactor
Nuclear Energy and Engineering
0103 physical sciences
0202 electrical engineering, electronic engineering, information engineering
Redundancy (engineering)
Neutron detection
Core shroud
Subjects
Details
- ISSN :
- 03064549
- Volume :
- 126
- Database :
- OpenAIRE
- Journal :
- Annals of Nuclear Energy
- Accession number :
- edsair.doi...........fddb929866f94dcc2cd0e815a0181341