Subcriticality Measurement of Pressurized Water Reactors during Criticality Approach using a Digital Reactivity Meter

Naing, Win; Tsuji, Masashi; Shimazu, Yoichiro

doi:10.1080/18811248.2005.9726374

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…2,3,4,5 It was necessary to correct all results of the experiments 6 for the temperature of 20.5°C, to be possible make the comparison with the theoretical results. The theoretical analysis was performed by the reactor physics code MCNP-5, using the nuclear data library ENDF/B-VII.0.…”

Section: Methodsmentioning

confidence: 99%

Control rod calibration and reactivity effects at the IPEN/MB-01 reactor

Pinto¹,

Gonnelli²,

Santos³

2014

AIP Conference Proceedings

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Feasibility study on nuclear core design for soluble boron free small modular reactor AIP Conference Proceedings 1659, 030010 (2015) Abstract.Researches that aim to improve the performance of neutron transport codes and quality of nuclear cross section databases are very important to increase the accuracy of simulations and the quality of the analysis and prediction of phenomena in the nuclear field. In this context, relevant experimental data such as reactivity worth measurements are needed. Control rods may be made of several neutron absorbing materials that are used to adjust the reactivity of the core. For the reactor operation, these experimental data are also extremely important: with them it is possible to estimate the reactivity worth by the movement of the control rod, understand the reactor response at each rod position and to operate the reactor safely. This work presents a temperature correction approach for the control rod calibration problem. It is shown the control rod calibration data of the IPEN/MB-01 reactor, the integral and differential reactivity curves and a theoretical analysis, performed by the MCNP-5 reactor physics code, developed and maintained by Los Alamos National Laboratory, using the ENDF/B-VII.0 nuclear data library.

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Section: Methodsmentioning

confidence: 99%

Control rod calibration and reactivity effects at the IPEN/MB-01 reactor

Pinto¹,

Gonnelli²,

Santos³

2014

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…2,3,4,5 It was necessary to correct all results of the experiments for the temperature of 20.5°C, to be possible make the comparison with the theoretical results. The theoretical analysis was performed by the reactor physics code MCNP-5, using the nuclear data library ENDF/B-VII.0.…”

Section: Methodsmentioning

confidence: 99%

Reactivity worth measurements at the IPEN/MB-01 nuclear reactor

Pinto¹,

Santos²

2013

AIP Conference Proceedings

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Researches that aim to improve the performance of neutron transport codes and quality of nuclear cross section databases are very important to increase the accuracy of simulations and the quality of the analysis and prediction of phenomena in the nuclear field. In this context, relevant experimental data such as reactivity worth measurements are needed. The objective of this work was to perform a series of experiments of reactivity worth measurements, using a digital reactivity meter developed at IPEN. The experiments employed small metallic and ceramic samples inserted in the central region of the core of the experimental IPEN/MB-01 reactor. The theoretical analysis was performed by the MCNP-5 reactor physics code, developed and maintained by Los Alamos National Laboratory, and the ENDF/B-VII.0 nuclear data library.

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“…In the foregoing study, 1) we have simulated criticality approach calculation by a digital reactivity meter using the initial reference subcriticality in which contains various errors. The estimated subcriticalities were found that they have good accuracy with the true value when the initial subcriticality was exact.…”

Section: Initial Reference Subcriticality and Error Contributionmentioning

confidence: 99%

“…It has been shown that a digital reactivity meter could monitor subcriticality continuously during criticality approach in a PWR. 1) However there still exist some technical issues to be investigated. One of them is that of sampling interval of the neutron signal to be used for the reactivity calculation by a digital reactivity meter.…”

Section: Introductionmentioning

confidence: 99%

Some Technical Issues on Continuous Subcriticality Monitoring by a Digital Reactivity Meter during Criticality Approach

Shimazu

Naing

2005

Journal of Nuclear Science and Technology

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It has been proposed that a digital reactivity meter can be used for not only subcriticality measurement but also continuous subcriticality monitoring during criticality approach. In this study, a mock up numerical simulation was carried out to investigate some technical issues that still exist. These are sampling interval, time lag of estimated subcriticality due to filtering effect as well as due to the error contribution to the initial reference subcriticality and the way to avoid time lag of estimated subcriticality from safety point of view. It was found that there is influence of sampling interval on the reactivity fluctuation. Filter can cause time lag of estimated subcriticality when a large filter time constant is used. In subcriticality monitoring, the error contribution to the initial reference subcriticality obtained by some design calculation should be investigated to detect accurately an unexpected criticality as earlier as possible. It was known that the negative error contribution to the initial reference subcriticality should be used from safety point of view. We have analytically obtained the relation between the error of the initial reference subcriticality, ramp rate of reactivity addition, warning subcriticality and the margin of the time interval for the counter action.

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Subcriticality Measurement of Pressurized Water Reactors during Criticality Approach using a Digital Reactivity Meter

Cited by 13 publications

References 11 publications

Control rod calibration and reactivity effects at the IPEN/MB-01 reactor

Control rod calibration and reactivity effects at the IPEN/MB-01 reactor

Reactivity worth measurements at the IPEN/MB-01 nuclear reactor

Some Technical Issues on Continuous Subcriticality Monitoring by a Digital Reactivity Meter during Criticality Approach

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