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1、DESIGN AND CONSTRUCTION RULES FOR MECHANICAL COMPONENTS OF PWR NUCLEAR ISLANDS R RC CC C- -M M S S SEE ECC CT T TIIIO O ON N N III : : : S S SUU UB B BSS SE E ECC CT T TIIIO O ON N N H H H S SU UP PP PO OR RT TS S RCC-M - Edition 2000 Subsection H n 92-2000 H 1000 / 1 H 1000 GENERAL H 1100 INTRODUCT
2、ION Subsection H covers supports for components which are intended to conform to the rules of the RCC-M in accordance with the requirements of chapter A 4000. Subchapter H 1200 defines the scope of this subsection. Subchapter H 1300 gives rules for classification of supports. Subchapter H 1400 defin
3、es the different types of supports and attachments, and classifies support members into primary (or load-bearing) and secondary (or stabilizing) members. Subchapter H 1500 specifies documents required for supports and support members. Subchapter H 1600 specifies identification procedures for parts a
4、nd welded joints. Chapter H 2000 contains rules for selection of materials for support members. Chapter H 3000 contains design rules for supports. Chapter H 4000 contains rules for fabrication and examination. Chapter H 5000 defines tests and qualification procedures to which standard supports or st
5、andard support members may be subjected. Whenever annex ZS is explicitly required by the contract, it supplements the requirements of this subsection whenever necessary. H 1200 SCOPE H 1210 GENERAL The rules of this subsection apply to supports for components which are intended to conform to the rul
6、es of the RCC-M. As used in this subsection, the term “support“ shall encompass structural elements which are intended to carry these loads to the fabric or to a structural steel member of the building structure, in the extent that these structural elements were designed to fulfil this function. RCC
7、-M - Edition 2000 Subsection H H 1000 / 2 n 92-2000 The rules of this subsection do not apply to: a) structural steel members* referred to above, forming part of the building structure, and intervening elements in the support load path, as defined in H 1220, such as motors, valve operators, access s
8、tructures, etc., b) support members, the sole function of which is to carry dynamic loads caused by loss of pressure retaining integrity. However, the technical provisions of this subsection may be used in full or in part for such members, particularly for those members which are not designed to abs
9、orb energy by nonelastic deformation, c) deterioration which may occur in service as a result of corrosion, erosion, radiation effects or instability of the materials. However, where such deterioration is to be expected under normal operating conditions (e.g. deterioration of synthetic materials as
10、a result of radiation effects), the minimum duration of support integrity shall be stipulated in the equipment specification. The rules of this subsection apply both to elements which carry the weight from above with the supporting member being in tension, and to elements which carry the weight from
11、 below the supporting member being in compression. They apply to all devices used to provide structural stability, to spring loaded sway braces and to vibration dampeners. For these components the rules defined in this subsection are not applicable to the mechanical or hydraulic systems which perfor
12、m the dampening or dynamic restraint functions. Only the connection of these systems to the component and to the building structure are covered by the requirements of this subsection. * Design of structural steel members shall be such as to permit adjustments during erection at least equal to civil
13、works tolerances. H 1220 JURISDICTIONAL BOUNDARIES OF SUBSECTION H H 1221 JURISDICTIONAL BOUNDARY BETWEEN SUPPORTED COMPONENT AND SUPPORT H 1221.1 Connection between pressure retaining component and integral support a) Integral supports encompass: - integral attachments cast or forged integral with
14、the pressure retaining component, - supports or attachments welded to the pressure retaining component, - supports welded to integral attachments cast or forged integral with the pressure retaining component. b) In this case, the jurisdictional boundaries of subsection H are as follows: - the pressu
15、re retaining component, depending on its class, is subject to the requirements of subsection B, C or D, RCC-M - Edition 2000 Subsection H n 92-2000 H 1000 / 3 - integral attachments cast or forged integral with the pressure retaining component shall be subject to the subsection applicable to the pre
16、ssure retaining component (figure H 1221 sketch (1), - supports or supporting attachments welded to the pressure retaining component shall be subject to the requirements of subsection H. The jurisdictional boundary of subsection H shall, in this case, be the weld joining the integral support to the
17、pressure retaining component. Such welds shall be subject to the requirements of the subsection applicable to the pressure retaining component, in accordance with A 4252 (figure H 1221 sketches (2) and (3). H 4400 may specify additional requirements for an area adjacent to the weld, the width of whi
18、ch depends on the examination requirements for the weld. Alternatively, supports or attachments welded to the pressure retaining component may also be treated as parts belonging to the pressure retaining component, - integral supports welded to an integral attachment cast or forged integral with the
19、 pressure retaining component shall be subject to the requirements of subsection H. The jurisdictional boundary of subsection H shall, in this case, be the weld joining the integral attachment to the support. Such welds shall be subject to the requirements of subsection H (figure H 1221 sketch (4),
20、where they are situated outside an area of width 2t on either side of the pressure retaining component. Otherwise, they shall conform to the rules applicable to the pressure retaining component, unless it can be demonstrated that the connecting zone has no determining effect on the mechanical behavi
21、our of the shell under pressure. * t is equal to the minimum allowable wall thickness at the point of attachment. H 1221.2 Connection between pressure retaining component and non-integral support a) Non-integral supports encompass: - supports which are bolted, pinned or clamped to the pressure retai
22、ning component or which are mechanically attached to an integral attachment cast or forged integral with the pressure retaining component, - supports on which components may bear directly. Examples of non-integral supports are sliding joints, cradles, saddles or clamps. b) In this case, the jurisdic
23、tional boundary of subsection H shall be the contact surface between the pressure retaining component or integral attachment and the non-integral support. The mechanical attachment shall be subject to the requirements of subsection H (figure H 1221 sketches (5) and (6). RCC-M - Edition 2000 Subsecti
24、on H H 1000 / 4 n 92-2000 H 1222 JURISDICTIONAL BOUNDARY BETWEEN COMPONENT OR SUPPORT AND BUILDING STRUCTURE H 1222.1 Connection between support and building structure a) Supports may be attached to the building structure: - by welding, - by mechanical means, - or they may bear directly on the build
25、ing structure, - they may also be an integral part of the building structure or be cast or forged integral with an element of the building structure. b) In accordance with H 1210.a), the building structure is outside the scope of this subsection. The jurisdictional boundary of subsection H shall be
26、the surface of the building structure. Where the support is welded to the building structure, the weld shall be subject to the requirements of subsection H (figure H 1222 sketch (1). Where the support is attached to the building structure by mechanical means, the mechanical attachment shall be subje
27、ct to the requirements of subsection H (figure H 1222 sketch (2). Anchoring devices (anchor rods and expansion shields) are outside the scope of this subsection. H 1222.2 Connection between pressure retaining component and building structure The boundary for application of rules for pressure retaini
28、ng components shall be the surface of the building structure. This boundary definition also applies to components encased in the building structure. The rules of subsection H apply to connections between the component and the building structure (figure 1222 sketch (3). The above provisions also appl
29、y where integral attachments cast or forged integral with the pressure retaining component bear directly on the building structure (figure H 1222 sketch (4). H 1222.3 Intervening elements Intervening elements not subject to RCC-M rules and referred to in H 1210.a) as intervening elements in the supp
30、ort load path between the pressure retaining component and the building structure, without being specially designed to fulfil this function, may be located between the component and the support, between two support members or between the support and the building structure. Jurisdictional boundaries
31、shall be those given in H 1222.1 for supports connected to intervening elements and in H 1222.2 for pressure retaining components connected to intervening elements. In applying these provisions, intervening elements shall be considered as part of the building structure. Connections between interveni
32、ng elements and the building structure are outside the scope of subsection H. RCC-M - Edition 2000 Subsection H n 92-2000 H 1000 / 5 H 1300 CLASSIFICATION OF SUPPORTS H 1310 SUPPORT CLASSES Supports are classified into two classes: S 1 and S 2. Support classes are a function of the class assigned to
33、 the supported component in accordance with A 4200. - A support for a class 1 component is classified S 1. - A support for a class 2 or 3 component is classified S 2. Where the support is common to components of different classes, it shall be classified under the most stringent class. H 1320 CHANGES
34、 IN CLASSIFICATION For each support, the Manufacturer shall assign the applicable class defined in H 1310. However, if the Manufacturer wishes, for example, to standardize production, he may assign a more severe class to certain supports (or support members). He shall inform the Contractor of this a
35、ction and shall apply in full the requirements of the most stringent class to the support or member concerned. H 1330 APPLICATION OF THIS SUBSECTION ACCORDING TO CLASS For the purposes of materials acceptance, fabrication, examination, or storage, the Manufacturer may apply to any support (or suppor
36、t member) the rules corresponding to a more severe class than that initially assigned. However, such supports (or support members) shall not be reclassified unless all the rules corresponding to the more stringent class are fully applied. H 1400 TYPES OF SUPPORTS AND ATTACHMENTS H 1410 TYPES OF SUPP
37、ORTS H 1411 GENERAL a) In this subsection, all component supports are categorized into three separate types which are defined in paragraphs H 1412, H 1413 and H 1414. b) In applying the requirements of H 4100, members of supports are classified into two groups according to their function and the str
38、esses to which they are subjected: - group 1 members are “primary“ (or load bearing) members the function of which is to carry the specified loads associated with the various loading conditions, RCC-M Addendum June 2002 Subsection H H 1000 / 6 n 96-2002 - group 2 members are “secondary“ members typi
39、cally used as bracing to maintain group 1 member system geometry; such members are not designed to sustain any significant stress under operating conditions, or are only required to perform their function during installation. Accordingly, only members which are subjected to stresses less than 50% of
40、 the allowable limits permitted in H 3000 or annex Z VI, or members which are not considered in substantiating the mechanical behaviour of supports, may be considered as group 2 members. However, standard support members, as defined in H 1414, may be considered as group 2 members irrespective of fun
41、ction, provided that the level of stress in the member is less than 50% of the allowable limits permitted in H 3000 or annex Z VI. H 1412 PLATE OR SHELL TYPE SUPPORTS Plate or shell type supports are supports such as vessel skirts and saddles which are fabricated from plate and shell elements and ar
42、e normally subjected to a biaxial stress field. H 1413 LINEAR TYPE SUPPORTS A linear type support is defined as acting under essentially a single component of direct stress. Examples: tension and compression struts, beams and columns subjected to bending, trusses, frames, rings, arches and cables. S
43、uch elements may also be subjected to shear stresses. H 1414 STANDARD SUPPORTS OR STANDARD SUPPORT MEMBERS a) Definition A standard support is a support assembly consisting of one or more member usually normalized or listed in a catalogue of items and generally mass produced. Standard supports and s
44、tandard support members may be approved: - either in accordance with the requirements of H 5000, - or in accordance with the requirements of H 2000 to H 4000. Typical standard support members are shown in figure H 1414. Standard supports are usually of the linear type but may also be of the plate or
45、 shell type. RCC-M - Edition 2000 Subsection H n 92-2000 H 1000 / 7 b) Types of standard supports The types of standard supports considered are those listed in (a) to (e) below: (a) : rigid supports: anchors, guides, restraints, rolling or sliding supports, and rod type hangers, (b) : constant and v
46、ariable type support spring hangers, (c) : snubbers, (d) : sway braces and vibration dampeners, (e) : integral and non-integral structural attachments, such as ears, shoes, lugs, rings, clamps, straps, and clevises. H 1420 TYPES OF ATTACHMENTS Connections between components and supports may be obtai
47、ned by welding or by use of integral attachments cast or forged integral with the pressure retaining component or mechanical means. The jurisdictional boundaries of subsection H are given in H 1221. H 1500 REQUIRED DOCUMENTS Required documents and their contents are given in chapter A 3000. Document
48、s required under this subsection are those which are kept available for Surveillance Agents; documents to be submitted shall be as stipulated in the contract. H 1510 DOCUMENTS RELATING TO COMPONENT SUPPORTS The documents listed in the following paragraphs shall be prepared for all supports subject t
49、o the requirements of this subsection. They may be prepared per lot of supports where this is compatible with fabrication conditions, e.g. in the case of standard supports acceptance tested in accordance with H 5000. H 1511 DOCUMENTS ATTACHED TO THE PURCHASE ORDER - Equipment specification (technical purchase order addenda) A 3100. It should be noted that, in view of the function of certain supports subject to the requirements of this subsection, the equipment specification for the support may in some cases be included in the specification for the
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