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 1100 INTRODUCTION
G 1110 APPLICATION OF SUBSECTION G
G 1111 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.
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G 1113 JURISDICTIONAL BOUNDARIES
Internal equipment welded to the reactor vessel wall are considered to be part of the reactor vessel wall.
Mechanical connections between reactor internals and reactor vessel shall meet the requirements of the present subsection.
G 1120 ORGANIZATION OF SUBSECTION G
Subchapter G 1200 specifies the documents to be prepared.
Subchapter G 1300 specifies the procedure for identification of component parts and welded joints.
Chapter G 2000 specifies the rules for selection of materials for all core support structures and for some internal structures.
Chapter G 3000 specifies rules for design.
Chapter G 4000 specifies rules for fabrication and examination.
Chapter G 5000 specifies supplementary requirements for non-destructive examination given in SECTION III.
G 1200 REQUIRED DOCUMENTS
Chapter A 3000 defines these documents and describes their content.
Documents required under this subsection shall be kept at the disposal of Surveillance Agents. The co
ntract shall specify which documents are to be handed over to the relevant parties.
G 1210 DOCUMENTS RELATING TO REACTOR INTERNALS
The following documents shall be prepared for components failing within the scope of subsection G. Where production conditions so permit, an entire lot of components may be covered by the same documents.
G 1211 DOCUMENTS ATTACHED TO THE PURCHASE ORDER
FOR REACTOR INTERNALS
Equipment specification (purchase order technical addenda)  - A 3100.
G 1212 PRELIMINARY DESIGN AND MANUFACTURING DOCUMENTS
FOR REACTOR INTERNALS
Comprehensive layout and referencing drawing - A 3201.
Sizing report for core support structures (CS).
Technical equipment manufacturing programme for reactor internals - A 3301.
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RCC-M  -  Edition 2007 Subsection G G 1213 DOCUMENTS PREPARED AND UPDATED
DURING FABRICATION
Comprehensive layout and referencing drawing - A 3201.
Stress report for core support structure (CS).
Welding data package - A 3501.
The welding data package shall be established for core support structures (CS) and shall be updated to take into account modifications in welding procedures.
Non-conformance or deviation reports - A 3700.
Follow-up documents - A 3801.
G 1214 POST-MANUFACTURING DOCUMENTS
End-of-manufacturing report - A 3805.
Certificate of compliance - A 3804.
reactor pressure vessel
G 1220 DOCUMENTS FOR COMPONENT PARTS
OF REACTOR INTERNALS
G 1221 PROCUREMENT DOCUMENTS
Part and product manufacturing programme A 3301.
Purchase order (technical and contractual clauses) - A 3302 (which refers in turn to SECTION II, chapter M 110).
Procurement specification, SECTION II (chapter M 110) states the conditions under which a special procurement specification must be established.
Filler material procurement specification - A 3502 (which refers in turn to S 2120).
Filler material acceptance report - A 3503 (which refers in turn to S 2550).
Component part follow-up documents - A 3801. This quality plan is only drawn up for parts covered by a part procurement specification.
(Other parts shall be included in the quality plan for the component of which they are a part.)
G 1222 MANUFACTURING DOCUMENTS
Fabrication instructions - A 3401
Welding instructions - A 3502
Welding report - A 3503
Examination instructions - A 3601
Examination report - A 3602
Production weld data sheet - A 3503
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G 1223 INSPECTION DOCUMENTS
List of examination personnel (in preparation).
G 1224 NON-CONFORMANCE OR DEVIATION REPORTS
See A 3700.
G 1300 IDENTIFICATION
G 1310 PURPOSE OF EQUIPMENT IDENTIFICATION SYSTEM
The equipment identification system is a means of unequivocally associating a part or weld joint with a given set of documents.
G 1320 ADAPTATION OF IDENTIFICATION SYSTEM
TO PRODUCTION CONTROL METHODS
Identification procedures must, therefore, be adapted to the type of production control method applied to the part or weld:
- control of individual items, using one identification number per item,
- control by lot, using one identification number per lot.
When a part is taken directly from stock and has only a steel grade number, the identification procedures set forth in the RCC-M shall not apply to the Manufacturer.
G 1330 IDENTIFICATION METHODS
Methods used to identify the components may include:
- engraving,
- temporary marking (with ink, paint, etc.),
- labelling,
- routing slips.
Identification methods and shop organization procedures shall be defined with a view to ensuring compliance with the objective set under B 1310.
G 1340 TYPE OF IDENTIFICATION DATA
The RCC-M does not require information related to the origin of any part or weld (such as lot No., heat-treatment No., welding operator No., heat No., etc.) to be marked or written on that item itself, its label, or its routing slip.
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