NP 031-01 PDF

Full title and description

NP 031-01 — "Нормы проектирования сейсмостойких атомных станций" (Design Standards for Seismic‑Resistant Nuclear Generating Stations). Federal norms and rules that establish requirements for ensuring the safety of land‑based nuclear power plants of all reactor types under seismic actions, including classification of seismic resistance categories, assignment of seismic action parameters, and requirements for the seismic resistance of structures, foundations, technological and electrical equipment, automation and communication systems.

Abstract

NP 031-01 sets mandatory design principles and technical requirements used in the siting and design of nuclear power plant (NPP) facilities in relation to seismic hazards. It defines how to determine seismic design parameters (deterministic and probabilistic approaches), assigns seismic‑resistance categories to plant elements, and specifies measures for structural and equipment seismic robustness, anchoring, and monitoring to maintain nuclear safety during and after seismic events. The document supersedes earlier PNAE guidance for seismic design of NPPs.

General information

• Status: Active / in force (federal norms and rules for use of atomic energy).
• Publication date: Introduced into force 1 January 2002 (approved by Gosatomnadzor by Resolution No. 9, 19 October 2001).
• Publisher: Approved by the Russian nuclear regulatory authority (Gosatomnadzor / Federal norms and rules in the field of atomic energy).
• ICS / categories: Nuclear energy engineering — Nuclear power plants. Safety (ICS 27.120.20).
• Edition / version: NP 031-01 (original entry into force 2002); text has recorded actualizations/updates in subsequent years (commercial/registry entries show updates/actualization notes through 2021).
• Number of pages: Commercial and registry copies vary by print/format — commonly listed at ~28 pages (electronic brief edition) to ~44–52 pages for print/annotated editions; page count depends on publisher/format and any later amendments.

Scope

Applies to the design of land‑based nuclear power plants with reactors of any type. The standard covers classification of seismic‑resistance categories for plant structures, systems and components; assignment and justification of seismic input parameters for design and safety analyses; design and detailing rules for building structures and foundations; requirements for seismic qualification and anchoring of technological, electrical and I&C equipment; and measures for automation, communication and post‑seismic operability. It is intended for application during site evaluation, conceptual and detailed design, and for works that affect seismic safety.

Key topics and requirements

• Definition and assignment of seismic‑resistance categories for SSCs (structures, systems, components).
• Determination of seismic input — deterministic and probabilistic approaches; design‑basis earthquake (DBE) specification and documentation.
• Seismic design principles for civil structures and foundations (detailing, ductility, load combinations under seismic actions).
• Seismic qualification, anchoring and mounting rules for technological, electrical and control equipment to preserve safety functions.
• Requirements for seismic instrumentation, monitoring and post‑seismic inspection/operability measures.
• Regulatory compliance and justification procedures used in licensing and safety assessment; alignment with IAEA guidance and predecessor national rules.

Typical use and users

Used by nuclear regulatory authorities, NPP designers and engineering organizations, structural and seismic engineers, equipment manufacturers and qualification laboratories, licensing and safety assessment teams, and plant operators when assessing or demonstrating seismic safety of new builds, major upgrades, or significant modifications to existing plants.

Related standards

Predecessor: PNAE G‑5‑006‑87 (earlier Soviet-era norms for seismic design of NPPs) — NP 031-01 was issued to replace and update that document. Related international standards and guidance include IAEA safety guides on seismic design and site evaluation and ISO/IEC/IEC series addressing seismic design of NPPs (e.g., ISO/ICS items for nuclear plant seismic design and the ISO 4917 series addressing design against seismic events). National and international nuclear‑safety standards on seismic qualification, electrical systems and I&C classification are typically applied in conjunction with NP 031-01.

Keywords

seismic design; nuclear power plants; seismic resistance; design‑basis earthquake; seismic qualification; Gosatomnadzor; PNAE G‑5‑006‑87; seismic instrumentation; structural design; safety standards.

FAQ

Q: What is this standard?

A: NP 031-01 is a Russian federal norms-and-rules document titled "Design Standards for Seismic‑Resistant Nuclear Generating Stations" that prescribes mandatory seismic‑design requirements for land‑based nuclear power plants.

Q: What does it cover?

A: It covers seismic classification of plant elements, methods to determine seismic design inputs (DBE), structural and foundation seismic design rules, seismic qualification/anchoring of equipment, seismic instrumentation and post‑seismic operability requirements, and the documentation and justification expected for licensing.

Q: Who typically uses it?

A: Nuclear regulators, NPP designers and engineering contractors, structural and seismic specialists, equipment suppliers, qualification/test organizations, and plant operators involved in design, licensing, procurement and safety assessments.

Q: Is it current or superseded?

A: NP 031-01 is listed in Russian registries as an active (in‑force) federal set of norms; it entered into force on 1 January 2002 (approved 19 October 2001) and registry entries show subsequent text actualizations/updates recorded (commercial/registry listings note updates through 2021). For licensing or design work always confirm you are using the regulator’s latest consolidated text and any amendments applicable at the time of the project.

Q: Is it part of a series?

A: NP 031-01 is a federal norms-and-rules document in the Russian nuclear regulatory framework and replaces earlier national PNAE guidance for seismic design of NPPs (PNAE G‑5‑006‑87). It is commonly used alongside other nuclear safety standards and international guidance (IAEA, ISO/IEC/IEC series) relevant to seismic design and equipment qualification.

Q: What are the key keywords?

A: Seismic design; nuclear power plant; seismic resistance; design‑basis earthquake; seismic qualification; structures and foundations; equipment anchorage; seismic instrumentation; Gosatomnadzor; PNAE.