GOST R 54786-2011 PDF

Full title and description

GOST R 54786-2011 — Fastening parts for detachable connections of nuclear power plants. Specifications. National standard of the Russian Federation that establishes technical requirements, mechanical properties, testing and acceptance rules for bolts, studs, nuts and washers used in removable (detachable) connections of equipment and pipelines in power and nuclear installations.

Abstract

This standard specifies technical conditions for manufacture, testing, acceptance, marking, packing and storage of fasteners intended for detachable connections in nuclear power plants and related power installations. It covers material and strength categories, heat treatment, impact toughness and nondestructive inspection requirements, quality grouping, and rules for documentation and traceability to ensure safety and reliability in primary and secondary circuit applications operating up to specified temperatures and pressures.

General information

• Status: Effective (introduced for the first time).
• Publication date: Approved 13 December 2011; entered into force 1 January 2013 (published 2012/2013 editions).
• Publisher: Federal Agency for Technical Regulation and Metrology (Rosstandart); published by standard publishing houses (Standartinform / Standardinform).
• ICS / categories: OKS/ICS classification: OKS 23.040.60; 27.120.20 — (fasteners; nuclear power plant equipment / power and heat engineering). Often referenced under national classification for fasteners and nuclear equipment standards.
• Edition / version: GOST R 54786-2011 (first edition, technical regulation approved by Rosstandart Order No. 1013-st).
• Number of pages: Approximately 36 pages (standard text and tables).

Scope

The standard applies to bolts, studs, nuts and washers used for detachable connections of equipment in primary and secondary circuits (reactors, steam generators, pressure vessels, heat exchangers, pump housings, fittings) and pipelines at thermal and nuclear power plants (including water-cooled, water-graphite and some fast-reactor systems). It covers applications with operating temperatures and pressures within the ranges specified in the standard (typical design use up to around 350 °C) and addresses items classified by groups and safety classes relevant to nuclear installations.

Key topics and requirements

• Definition of product scope: bolts, studs, nuts and washers for detachable/flanged and other removable connections in power and nuclear installations.
• Material and grade requirements: permitted steel grades, heat treatment and microstructure controls appropriate for high-reliability applications.
• Mechanical property limits: tensile strength, yield, elongation and hardness criteria by strength category.
• Impact toughness requirements and sampling (including temperature and specimen types) for specified strength categories.
• Nondestructive testing and acceptance: visual, dimensional, and specified NDT methods where required (e.g., magnetic particle, penetrant, ultrasonic as applicable).
• Surface treatment, corrosion protection and coating requirements appropriate for service conditions.
• Quality grouping, inspection and certification rules; traceability and documentation required for nuclear safety classifications.
• Marking, packing, transportation and storage practices to preserve conformity and identification.
• Test methods and sampling plans for batch acceptance and periodic control.

Typical use and users

Primary users are fastener manufacturers and suppliers producing components for power and nuclear industry applications, designers and engineers of nuclear and thermal power plant equipment, quality assurance and regulatory compliance teams, procurement specialists specifying safety-class fasteners, and test laboratories performing mechanical and nondestructive tests for acceptance and certification.

Related standards

The standard is used alongside other national and industry norms for nuclear fasteners and testing, for example earlier GOST/GOST R documents on bolts, studs, nuts and washers for atomic power plants, general fastener specifications, nondestructive testing standards, and material standards and test methods (examples include GOST 23304‑78 and other GOSTs covering material, heat treatment, impact testing and NDT methods).

Keywords

fasteners; bolts; studs; nuts; washers; detachable connections; nuclear power plants; technical conditions; mechanical properties; impact toughness; acceptance tests; nondestructive testing; marking; traceability; quality groups; Rosstandart.

FAQ

Q: What is this standard?

A: GOST R 54786-2011 is a Russian national standard that establishes technical requirements and acceptance/testing rules for fastening parts (bolts, studs, nuts, washers) used in detachable connections of nuclear and power plant equipment.

Q: What does it cover?

A: It covers material and strength categories, mechanical and impact properties, heat treatment, nondestructive inspection and testing, acceptance criteria, marking, packing and storage, and documentation/traceability requirements for fasteners used in safety-relevant connections in power and nuclear installations.

Q: Who typically uses it?

A: Fastener manufacturers, plant designers and engineers, procurement and QA teams at thermal and nuclear power plants, testing laboratories, and regulatory bodies responsible for equipment conformity in power generation facilities.

Q: Is it current or superseded?

A: As issued it is the 2011 national publication introduced into force on 1 January 2013. Users should verify the current status before use (check for amendments, technical updates or replacement standards through official national standards publications or the relevant standards body).

Q: Is it part of a series?

A: It complements and in some cases replaces earlier GOST/GOST R documents dealing with flanged-connection fasteners and nuclear equipment (for example historical documents specifying bolts, studs, nuts and washers for atomic power plants). It is part of the broader body of standards governing fasteners, materials and testing used in nuclear and power engineering.

Q: What are the key keywords?

A: Fasteners, bolts, studs, nuts, washers, detachable connections, nuclear power plants, mechanical properties, impact toughness, acceptance tests, nondestructive testing, marking, traceability.