IEC TR 63335 pdf – Nuclear power plants – Instrumentation and control systems, control rooms and electrical power systems – Specific features of small modular reactors and needs regarding standards
This document identifies a number of issues of particular importance to light water SmallModular Reactors (SMRs),which are not currently adequately addressed by existing lEC SC 45A standards，and that could be considered when revising existing publications or thatcould be the object of new work item proposals. Whethereach of these issues will indeed be addressed, and if so in which publication, will be the decision of each SC 45A working group.
Though there are a number of advanced Generation lV SMR projects underway, their specificneeds are not covered by this document.
This document is organized as follows:
Clause 5 presents the main features of SMRs that are not typically found in large reactorsor that are of particular importance for SMRs, and that could require specific or additional
requirements andrecommendations over thosealready provided in lEC SC 45Astandards.
Clause 6 suggests,for each working group，a number of issues that could be consideredin the revision of existing publications or as subjects for new work items.
Clause 7 suggests topics of importance to SMRs but that do not fit in the current scope ofexisting working groups.
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document. For dated references, only the editioncited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 61513，Nuclear power plants – lnstrumentation and control important to safety- Generalrequirements for systems
ISO/IEC 15026-2:2011，Systems and software engineering – Systems and software assurance- Part 2: Assurance case
ISO/IECIEEE 15288, Systems and software engineering – System life cycle processesIAEA SSR-2/1，Safety of Nuclear Power Plants: Design
WENRA Report，Safety of New NPP Designs
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISo and lECmaintain terminological databases for use in standardization at the followingaddresses:
. IEC Electropedia: available at http://www.electropedia.orgl
.Iso Online browsing platform: available at http://www.iso.org/obp
Small Modular ReactorSMR
small: reactor the electrical output of which is less than 300 Mw.
Modular: design and construction approach based in a large part on the assembly of fullyoperational modules built and pre-tested in dedicated factories
Cooperation in Reactor Design Evaluation and Licensing
Human Machine Interface
lnternational Atomic Energy Agency
lnternational Electrotechnical Commission
lInstitute of Electrical and Electronic Engineers
lnstrumentation and Control
Loss of Electrical Power
Loss Of Offsite Power
Main Control Room
Multinational Design Evaluation Programme
Nuclear Energy Agency
Nuclear Power Plant
Nuclear Regulatory Commission
Organisation for Economic Co-operation and Development
Radio Frequency Interference
Station Black Out
Small Modular reactors
Transmission System Operator
Visual Display Unit
Verification and Validation
western European Nuclear Regulators Association