2024年5月22日发(作者：出丹寒)
DESIGN AND CONSTRUCTION RULES
FOR MECHANICAL COMPONENTS OF PWR
NUCLEAR ISLANDS
RCC-M
SECTION I :
SUBSECTION G
REACTOR INTERNALS
RCC-M - Edition 2007 Subsection G
G 1000
GENERAL
G 1110
G 1111
G 1100 INTRODUCTION
APPLICATION OF SUBSECTION G
DEFINITION OF REACTOR VESSEL INTERNALS
Reactor vessel internals comprise all mechanical structure items located inside the reactor vessel.
The following items are not covered by Subsection G:
- the core: fuel, fertile and dummy fuel assemblies,
- reactivity control items: control rods and drive shafts,
- related core components: closures, poison and source rod assemblies
- in-core instrumentation: non-mechanical parts.
G 1112 CLASSIFICATION OF COMPONENTS
In accordance with A 4310, component parts of reactor internals shall be classified into two
categories: core support structures (CS) and internal structures (IS).
a) Core support structures (CS) are those structures or parts of structures which provide support
and restraint of the fuel assemblies making up the core within the reactor pressure vessel.
Structures designed to support or restrain the core only after the postulated failure of core
support structures are classified as internal structures (IS).
b) All other reactor internal structures shall be classified as internal structures (IS).
c) For the purposes of chapters G 4000 and G 5000 only, welds joining internal structures (IS) to
core support structures (CS) shall be considered to be core support structures (CS).
d) Temporary fasteners which come in contact or are connected to the reactor internals but which
are removed before commissioning are not covered by the present subsection. Temporary
fasteners include, for example, tie plate alignment lugs, braces, supports and hoods for pre-
service instrumentation.
© n° 113-2007 G 1000 / 1
2024年5月22日发(作者：出丹寒)
DESIGN AND CONSTRUCTION RULES
FOR MECHANICAL COMPONENTS OF PWR
NUCLEAR ISLANDS
RCC-M
SECTION I :
SUBSECTION G
REACTOR INTERNALS
RCC-M - Edition 2007 Subsection G
G 1000
GENERAL
G 1110
G 1111
G 1100 INTRODUCTION
APPLICATION OF SUBSECTION G
DEFINITION OF REACTOR VESSEL INTERNALS
Reactor vessel internals comprise all mechanical structure items located inside the reactor vessel.
The following items are not covered by Subsection G:
- the core: fuel, fertile and dummy fuel assemblies,
- reactivity control items: control rods and drive shafts,
- related core components: closures, poison and source rod assemblies
- in-core instrumentation: non-mechanical parts.
G 1112 CLASSIFICATION OF COMPONENTS
In accordance with A 4310, component parts of reactor internals shall be classified into two
categories: core support structures (CS) and internal structures (IS).
a) Core support structures (CS) are those structures or parts of structures which provide support
and restraint of the fuel assemblies making up the core within the reactor pressure vessel.
Structures designed to support or restrain the core only after the postulated failure of core
support structures are classified as internal structures (IS).
b) All other reactor internal structures shall be classified as internal structures (IS).
c) For the purposes of chapters G 4000 and G 5000 only, welds joining internal structures (IS) to
core support structures (CS) shall be considered to be core support structures (CS).
d) Temporary fasteners which come in contact or are connected to the reactor internals but which
are removed before commissioning are not covered by the present subsection. Temporary
fasteners include, for example, tie plate alignment lugs, braces, supports and hoods for pre-
service instrumentation.
© n° 113-2007 G 1000 / 1