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This paper presents the initial criticality startup of Unit H, a pressurized water reactor (PWR), using activated secondary neutron sources. The methodology for implementing these sources is detailed, and an analysis of the reactor’s initial criticality characteristics is provided. Key findings include: a low inverse count rate of 0.08 in the source range channel, demonstrating a conservative and safe approach to determining the pre-critical point; the minimal impact of external neutron source intensity on the critical boron concentration at criticality; and the overall viability of using activated secondary neutron sources as a replacement for primary neutron sources in PWR initial criticality startups. The operational strategy employed for Unit H offers a valuable reference for the design and commissioning of future PWRs.

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Initial Criticality Characteristic Analysis of PWR Using Activated Secondary Neutron Source

  • 会议论文

  • 发表日期：

    2025年

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  • Xiong-wei Cheng,
  • Wen-qing Yang,
  • Chu-hao Huang

摘要

This paper presents the initial criticality startup of Unit H, a pressurized water reactor (PWR), using activated secondary neutron sources. The methodology for implementing these sources is detailed, and an analysis of the reactor’s initial criticality characteristics is provided. Key findings include: a low inverse count rate of 0.08 in the source range channel, demonstrating a conservative and safe approach to determining the pre-critical point; the minimal impact of external neutron source intensity on the critical boron concentration at criticality; and the overall viability of using activated secondary neutron sources as a replacement for primary neutron sources in PWR initial criticality startups. The operational strategy employed for Unit H offers a valuable reference for the design and commissioning of future PWRs.