NP 105-18 PDF

Full title and description

NP 105-18 — Federal norms and rules in the field of the use of atomic energy: "Rules for the control of metal of equipment and pipelines of nuclear power installations during manufacture and assembly". The document establishes requirements for performance, types, volumes, methods and quality-assessment criteria for inspection and control of base metal, weld metal and deposited (surfacing) metal used in equipment and piping for nuclear power installations.

Abstract

NP 105-18 specifies mandatory controls and acceptance criteria to ensure the integrity and quality of metallic components and welded joints in nuclear power plant equipment and pipelines during design, manufacture and on-site assembly. It covers planning of control, nondestructive examination (visual, dimensional, penetrant, magnetic, radiographic and ultrasonic), sampling and frequency, evaluation norms, documentation and traceability, and requirements for repairs and rework. The rules are intended to reduce the risk of material-related failures in nuclear installations by standardizing inspection practice and acceptance limits.

General information

• Status: Effective / current (in force).
• Publication date: Entered into force 1 January 2019 (approved by Rostechnadzor Order No. 553, 14 November 2018; registered with the Ministry of Justice 20 December 2018, No. 53090).
• Publisher: Approved and issued by the Federal Service for Environmental, Technological and Atomic Supervision (Rostechnadzor); disseminated through official and commercial standards publishers and collections.
• ICS / categories: Nuclear engineering / atomic energy safety; metallurgy and welding; nondestructive testing; quality assurance and inspection of pressure equipment.
• Edition / version: Original issue (designated НП-105-18 / NP-105-18) — implemented 2019; later amendments have been issued (see Scope / FAQ).
• Number of pages: Varies by publication/format — commonly distributed editions list about 70 pages (official compact edition) while full printed/annotated editions and library copies show higher page counts (reports of ~116–127 pages depending on publisher and annexes).

Scope

These Rules apply to design, engineering, manufacture and erection (installation) of equipment and pipelines of nuclear power installations and set out mandatory requirements for control of the condition and quality of base metal, welded joints and deposited surfaces. The Scope covers types of control (visual, dimensional, various nondestructive testing methods), volumes and frequencies of inspection, criteria for acceptance and rejection, documentation and traceability requirements, qualification and responsibilities of personnel performing control, and requirements for corrective actions and repair of detected defects. The document is applicable to organizations involved in fabrication, welding, surface deposition, NDT, assembly and commissioning of metallic equipment and piping for nuclear facilities.

Key topics and requirements

• Definitions and classification of components, materials and safety categories for inspection planning.
• Mandatory control methods: visual and dimensional inspection, liquid penetrant, magnetic particle, radiographic, ultrasonic testing and other accepted NDT techniques; specific indications on method selection by component type and safety category.
• Volume and frequency of inspections by component category, including sampling rules and acceptance thresholds for defects and discontinuities.
• Acceptance criteria and quality-assessment norms for base metal, welds and deposited surfaces (tables and annexes provide numeric limits and classification of discontinuities).
• Requirements for qualification, certification and recordkeeping for personnel performing control and NDT.
• Documentation, traceability and marking requirements for materials, welds and inspection results; mandatory reporting and retention practices.
• Procedures for repair, re-inspection and disposition of nonconforming items; responsibilities of manufacturer, assembler and supervising authority.

Typical use and users

Primary users include nuclear plant designers and engineers, fabricators and manufacturers of nuclear equipment and piping, welding and surfacing specialists, nondestructive testing (NDT) technicians and laboratories, quality assurance/quality control departments in the nuclear supply chain, plant constructors and erection contractors, and regulatory/supervisory bodies overseeing nuclear safety and compliance. The document is used to develop inspection plans, acceptance criteria, NDT procedures, and supplier quality programs for nuclear projects.

Related standards

NP 105-18 is part of a set of federal rules and norms addressing welding, fabrication and inspection for nuclear installations. Closely related documents include NP 104-18 (welding and overlay welding of equipment and piping of nuclear power units) and other NP-series rules and GOST/PNAE legacy norms that relate to testing, welding qualifications and pressure equipment. NP 105-18 replaced or updated requirements previously covered in older PNAE/GOST documents addressing metal control for nuclear equipment.

Keywords

NP-105-18; НП-105-18; metal control; nondestructive testing; NDT; weld inspection; nuclear power plant; equipment and pipelines; fabrication; assembly; Rostechnadzor; acceptance criteria; traceability; repair procedures.

FAQ

Q: What is this standard?

A: NP 105-18 is a federal normative document (НП-105-18) that establishes mandatory rules for control of metal of equipment and pipelines of nuclear power installations during manufacture and assembly, issued under the authority of the Russian Federal Service for Environmental, Technological and Atomic Supervision (Rostechnadzor).

Q: What does it cover?

A: It covers the scope, methods, volumes and acceptance criteria for inspection and testing of base metal, welded joints and deposited (surfacing) metal used in nuclear equipment and piping, including required NDT methods, documentation and personnel qualifications, and procedures for repair and re-inspection.

Q: Who typically uses it?

A: Engineers, fabricators, welding specialists, NDT personnel and laboratories, QA/QC teams, plant erection contractors and regulatory/supervisory organizations involved in the manufacture, assembly and inspection of nuclear power plant metal components.

Q: Is it current or superseded?

A: NP 105-18 was introduced into force on 1 January 2019 (approved by Rostechnadzor Order No. 553 of 14 November 2018) and is listed as an active rule. Amendments have been made since initial publication (registrations and amendment orders are recorded in official lists); consult the approving authority or the consolidated text to confirm the latest amendments and effective dates for any changes.

Q: Is it part of a series?

A: Yes — NP 105-18 is part of the NP-series (federal norms and rules for atomic energy use) that address construction, fabrication, welding, testing and operational safety of nuclear installations; it is intended to work in conjunction with related NP and GOST/PNAE documents that define welding, testing and pressure-equipment requirements.

Q: What are the key keywords?

A: Metal control; weld inspection; nondestructive testing (NDT); radiographic testing; ultrasonic testing; visual inspection; liquid penetrant; magnetic particle; acceptance criteria; traceability; nuclear power plant equipment; fabrication; assembly.