OTT 1.3.3.99.0141-2012 PDF

Full title and description

OTT 1.3.3.99.0141-2012 — "Valves of pipeline technological systems of nuclear power plants, not affecting safety. General technical requirements" (Russian: ОТТ 1.3.3.99.0141-2012 — Арматура трубопроводная технологических систем атомных станций, не влияющая на безопасность. Общие технические требования).

Abstract

This departmental technical specification sets general technical requirements for the design, materials, manufacture, assembly, testing, installation, operation and maintenance of pipeline valves used in nuclear power plant technological systems that are classified as not affecting nuclear safety (4th safety class). It addresses mechanical construction, sealing, welding and fabrication quality, protection against unauthorized access, safety requirements for valve actuators/drives, and metrological and testing provisions for valves intended for liquid, gaseous and steam media.

General information

• Status: Introduced (first issued) in 2013; commercial registries report both "introduced" and later "cancelled/withdrawn" entries — see notes below.
• Publication date: Designation year 2012 (identifier includes 2012); approved by Rosenergoatom in February 2013 and introduced (effective) on 01 October 2013 in several databases.
• Publisher: Rosenergoatom Concern (departmental issuer for nuclear industry technical norms).
• ICS / categories: Nuclear power engineering / nuclear power plants (ISO classifier: 27.120 / 27.120.20).
• Edition / version: Original designation 2012; introduced (first edition) 2013.
• Number of pages: Commercial sources list differing page counts (examples: 33 pages in some catalogs, 82 pages in others); page count varies by publication/translated edition.

Scope

The specification applies to pipeline valves and valve drives for technological systems of nuclear power plants that are classified as not affecting safety (4th safety class per NP-001-97 / OPB-88/97). It covers valves with nominal diameters typically from 10 mm up to 3200 mm, intended for operation on liquid, gaseous and steam media at temperatures from −50 °C to +550 °C and at pressures up to 25 MPa, with metallic pressure-containing parts, unless otherwise specified by the customer. The document defines requirements for design features, materials, fabrication, welding, sealing, testing and protective measures.

Key topics and requirements

• Classification of valves by safety class and intended service (4th-class valves not affecting nuclear safety).
• Design and construction requirements for valve bodies, stems, seats and sealing elements.
• Material selection rules, accepted semi-finished sealing products and fasteners.
• Welding, surfacing (overlay) and fabrication methods plus associated acceptance criteria.
• Inspection and non-destructive testing requirements during manufacture and after repairs.
• Leakage/permissible leakage rates, testing procedures and acceptance tests for pressure and tightness.
• Requirements for valve actuators/drives, local safety features and protection from unauthorized access.
• Operational, maintenance and repair requirements including marking, documentation and metrological assurance.
• Reference to relevant national GOSTs, safety rules and measurement standards used for conformity and testing.

Typical use and users

Primary users are designers, manufacturers and suppliers of pipeline valves for nuclear power plants, plant engineering departments, procurement and quality assurance teams, commissioning and maintenance personnel at nuclear power facilities, and regulatory departments that manage industry technical documentation. The standard is used when specifying non-safety-class valves for technological circuits, preparing technical contracts, and establishing factory and acceptance testing programs.

Related standards

The document references and aligns with multiple national standards and rules, for example: GOST R 53672 (pipeline valves — general safety requirements), GOST 14254 (degrees of protection — IP code), GOST 15150 (climatic versions and categories), GOST 2.610 (design documentation rules), NP-001-97 / PNAE G-01-011-97 (general safety regulations for nuclear plants), and other sectoral technical regulations and measurement standards used for testing and metrology. It is also listed alongside other Rosenergoatom departmental technical documents for nuclear plant equipment.

Keywords

valves; pipeline valves; nuclear power plants; technological systems; non-safety-class valves; materials; welding; testing; leakage; valve drives; Rosenergoatom; ОТТ; NP-001-97.

FAQ

Q: What is this standard?

A: It is a Rosenergoatom departmental technical specification (ОТТ) that defines general technical requirements for pipeline valves used in nuclear power plant technological systems when those valves are classified as not affecting nuclear safety (4th safety class).

Q: What does it cover?

A: It covers design, materials, fabrication, welding, sealing, inspection and testing, actuator/drive requirements, protection from unauthorized access, operational and maintenance provisions, and metrological/testing arrangements for valves intended for specified temperature and pressure ranges.

Q: Who typically uses it?

A: Valve designers, manufacturers and suppliers for nuclear plants; plant engineering, commissioning and maintenance teams; procurement and QA departments; and regulatory/standards specialists in the nuclear sector.

Q: Is it current or superseded?

A: Commercial registries show mixed status entries: the specification was introduced (effective) in 2013 after approval in early 2013, but some registries note it was later cancelled/withdrawn (cancellation entry cited for 15 August 2017). Users should check the current authoritative Rosenergoatom or national regulatory catalog to confirm present legal/applicability status before relying on it for procurement or compliance.

Q: Is it part of a series?

A: Yes — it is one of a number of Rosenergoatom ОТТ (departmental technical) documents covering equipment, structures and systems for nuclear power plants; related ОТТs address other classes of valves, supports, piping and equipment. It also complements national GOST standards for pipeline valves and nuclear-industry regulations.

Q: What are the key keywords?

A: Valves, pipeline fittings, nuclear power plant, technological systems, safety class 4, materials, welding, testing, leakage, actuator, Rosenergoatom, ОТТ 1.3.3.99.0141-2012.