GB15146.2-2008

Nuclear criticality safety for fissile materials outside reactors - Part 2: Basic technical practices and subcritical limits for handling, processing and operations with fissile materials

反应堆外易裂变材料的核临界安全第2部分：易裂变材料操作、加工、处理的基本技术规则与次临界限值

GB 15146.2-2008 é uma norma nacional chinesa obrigatória vigente: Nuclear criticality safety for fissile materials outside reactors - Part 2: Basic technical practices and subcritical limits for handling, processing and operations with fissile materials. Setor: Construção. Foco: Segurança de produtos. Entrada em vigor: 1 de ago. de 2009.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard applies to the handling, processing, and operations of fissile materials outside reactors. It establishes basic technical rules and subcritical limits for simple geometric shapes, specifically targeting nuclear fuel cycle facilities and related engineering operations. This standard is not applicable to the assembly of fissile materials under controlled conditions, such as critical experiments.

Requisitos técnicos

This standard is mandatory and specifies fundamental technical rules for maintaining nuclear criticality safety. It requires controlling one or more system parameters (such as mass, geometry, concentration, or moderation) within subcritical limits while maintaining adequate safety margins for process uncertainties. Engineers must apply the double contingency principle, ensuring that at least two independent, unlikely changes in process conditions must occur simultaneously to cause a criticality accident. The standard also details single-parameter limits for homogeneous aqueous solutions, metal units, and oxides of 233U, 235U, and 239Pu, as well as multi-parameter controls for low-enriched uranium and plutonium mixtures.

Métodos de ensaio

The standard emphasizes the validation of calculation methods used to evaluate criticality safety. It requires determining the bias and uncertainty of computational methods by comparing them against experimental critical data. Validation solely by comparing results from different calculation methods is explicitly not acceptable. The evaluation also requires verifying computer programs and ensuring that nuclear characteristic parameters, such as cross-section data, are consistent with experimental measurements.

Perguntas frequentes

What operations and materials are regulated under GB 15146.2-2008?

The standard applies to the handling, processing, and operations of fissile materials outside reactors. It is explicitly not applicable to the assembly of fissile materials under controlled conditions, such as critical experiments.

Are there any significant updates from the previous GB 15146.2-1994 version?

The 2008 version added 233U subcritical limits, changed the terminology from 'validation of calculation methods' to 'confirmation of calculation methods' (adding general requirements), and modified auxiliary verbs from 'must' to 'should' or 'may' to align with updated administrative practices.

How does GB 15146.2-2008 handle the validation of calculation methods when experimental data is unavailable?

The standard requires that calculation methods be validated against experimental critical data to determine bias and its uncertainty. Validation solely by comparing results from different calculation methods is explicitly not acceptable.

The summary above provides a high-level overview of GB 15146.2-2008. To ensure complete compliance for your nuclear facilities and operations entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 15146.2-2008 today to access all detailed parameter tables, calculation validation procedures, and subcritical limit data.

Indicações de aplicabilidade

Tipo: Segurança
CCS: F09
ICS: 27.120.30
Órgão competente: State Administration of Science, Technology and Industry for National Defense
Comitê técnico: State Administration of Science, Technology and Industry for National Defense

Relações

Substitui:GB 15146.2-1994