1.1 本规范定义了用于贮存核轻水堆乏燃料组件或拆卸部件的池环境机架中使用的硼基中子吸收材料系统的标准，以保持贮存机架系统中的亚临界状态。 1.2 硼基中子吸收材料系统通常由金属硼或含硼化合物（例如碳化硼、硼）组成 4. C） 由铝、钢或其他材料基体支撑。 1.3 在硼基吸收体中，中子吸收主要通过天然硼中18.3±0.2的硼-10同位素发生 % 按重量计（取决于硼的地质成因）。 也可以使用富含硼-10的硼。 1.4 本文所述的材料系统应具有功能性（即始终能够保持硼-10的面密度，从而根据核乏燃料池运行环境中使用寿命的设计规范保持亚临界）。 1.5 遵守本规范并不免除用户遵守所有适用国际、国家和地方法规的义务。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification defines criteria for boron-based neutron absorbing material systems used in racks in a pool environment for storage of nuclear light water reactor (LWR) spent-fuel assemblies or disassembled components to maintain sub-criticality in the storage rack system. 1.2 Boron-based neutron absorbing material systems normally consist of metallic boron or a chemical compound containing boron (for example, boron carbide, B 4 C) supported by a matrix of aluminum, steel, or other materials. 1.3 In a boron-based absorber, neutron absorption occurs primarily by the boron-10 isotope that is present in natural boron to the extent of 18.3 ± 0.2 % by weight (depending upon the geological origin of the boron). Boron enriched in boron-10 could also be used. 1.4 The materials systems described herein shall be functional (that is, always be capable to maintain a boron-10 areal density such that subcriticality is maintained depending on the design specification for the service life in the operating environment of a nuclear spent fuel pool). 1.5 Observance of this specification does not relieve the user of the obligation to conform to all applicable international, national, and local regulations. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.