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Mirza NM, Rafique M, Mirza SM, et al. Simulation of corrosion product activity for nonlinearly rising corrosion on inner surfaces of primary coolant pipes of a typical PWR under flow rate transients. Appl Radiat Isot. 2005;62(5):681-92doi: 10.1016/j.apradiso.2004.12.005.
Mirza, N. M., Rafique, M., Mirza, S. M., & Hyder, M. J. (2005). Simulation of corrosion product activity for nonlinearly rising corrosion on inner surfaces of primary coolant pipes of a typical PWR under flow rate transients. Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine, 62(5), 681-92. https://doi.org/10.1016/j.apradiso.2004.12.005
Mirza, Nasir M, et al. "Simulation of corrosion product activity for nonlinearly rising corrosion on inner surfaces of primary coolant pipes of a typical PWR under flow rate transients." Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine vol. 62,5 (2005): 681-92. doi: https://doi.org/10.1016/j.apradiso.2004.12.005
Mirza NM, Rafique M, Mirza SM, Hyder MJ. Simulation of corrosion product activity for nonlinearly rising corrosion on inner surfaces of primary coolant pipes of a typical PWR under flow rate transients. Appl Radiat Isot. 2005 May;62(5):681-92. doi: 10.1016/j.apradiso.2004.12.005. Epub 2005 Jan 26. PMID: 15763473.
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Appl Radiat Isot. 2005 May;62(5):681-92. doi: 10.1016/j.apradiso.2004.12.005. Epub 2005 Jan 26.

Simulation of corrosion product activity for nonlinearly rising corrosion on inner surfaces of primary coolant pipes of a typical PWR under flow rate transients.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

Nasir M Mirza, Muhammad Rafique, Sikander M Mirza, M Javed Hyder

Affiliations

  1. Department of Physics & Applied Mathematics, Pakistan Institute of Engineering & Applied Sciences, Nilore, Islamabad 45650, Pakistan. [email protected]

PMID: 15763473 DOI: 10.1016/j.apradiso.2004.12.005

Abstract

For nonlinear accelerating corrosion, calculation of activated corrosion products on inner surfaces of primary coolant pipes have been done in a typical pressurized water reactor (PWR) under flow rate perturbations. Computer program CPAIR-P (Corrosion Product Activity In Reactors) (Deeba et al., 1999) has been modified to accommodate for time-dependent corrosion rates. Results, for (24)Na, (56)Mn, (59)Fe, (58)Co, (60)Co and (99)Mo, show that the specific activity in primary loop approaches equilibrium value under normal operating conditions fairly rapidly. Predominant corrosion product activity during operation is due to (56)Mn, and cobalt isotopes dominate the activity after shutdown of reactor. Flow rate perturbations and different types of rising corrosion rates were introduced in the system and effects on saturation activity were studied. For a linear decrease in flow rate and a constant corrosion rate, the total coolant activity and activity on pipe scale approaches higher saturation values when compared to normal condition values. With a nonlinearly accelerating corrosion, the behavior of specific activity changes considerably. The flow rate perturbations on specific activity for pipe scale results in a new saturation value which depends on both the changes in flow rate (Delta w) and equilibrium corrosion rate (C(s)) values. However, the time taken to reach the saturation activity depends on the slope of corrosion rate. For a slow pump coastdown, the activity does not show an initial drop when flow rate starts decreasing. It monotonically rises and follows the slope of corrosion rate. The peak value and decay of activity after scram are strong functions of flow rate and removal efficiencies.

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