F6000Word格式.docx

1、- reduction in heat exchange due to the effect of deposits.The degree of cleanliness is the required cleanliness of a given surface prior to testing and start-up of the facility. There are several degrees of cleanliness.Verification tests and different levels of criteria, as defined in F 6300, are a

2、ssociated with each degree of cleanliness.F 6120 APPLICABILITYThe requirements of this chapter are applicable to mechanical components subject to the RCC-M which convey or are in contact with one of the fluids listed in F 6220 （primary fluids, secondary fluids, component cooling fluids and effluent）

3、.For these components, the majority of the requirements given in this chapter are applicable to all surfaces in contact with process fluids.Only the requirements given in paragraphs F 6300, F 6400 and F 6640 are also applicable to the outer surfaces of these components.F 6130 TIME OF APPLICATIONAt t

4、he very latest, the required degree of cleanliness shall be achieved during the last phase of fabrication in which the verification of the applicable criteria is possible, and shall be maintained up to initial filling of the system with the process fluid. Cleaning shall be performed in the workshop

5、unless otherwise stipulated in the equipment specification. Further fabrication, conditioning, transportation, site installation, etc., processes shall also include dispositions to preserve and （or） restitute the required degree of cleanliness.Slight degradation in cleanliness between the time the c

6、omponent is cleaned and the time when the system to which the component pertains is filled, shall be acceptable provided that:- there is no adverse effect on the conservation of the component, i.e. there is no corrosion of the materials,- the required degree of cleanliness may be obtained by the nor

7、mal cleaning operation scheduled for a later phase.The respect of the requirements given in this chapter limits remedial cleaning operations.The Manufacturer shall specify at which phase in fabrication he considers that the requirements of this chapter should be applied. This phase shall be, at the

8、very latest, the phase at which the required degree of cleanliness is achieved. F 6140 STRUCTURE OF THIS CHAPTERF 6200 specifies the rules for assigning components to one of three cleanliness classes. The requirements of this chapter are based on this classification.F 6200 also specifies the require

9、d ambient conditions for cleaning and subsequent work operations （work areas）. The concept of work zones on the construction site, with specific zone designation and conditions applicable to the various construction phases are similarly explained in this paragraph. F 6300 specifies the tests to be p

10、erformed after cleaning and the associated criteria.F 6400 specifies rules for the prevention of contamination.F 6500 specifies requirements for main methods of cleaning.F 6600 specifies the requirements for the preservation of cleanliness and for the final cleaning operations during on-site constru

11、ction prior to startup.F 6150 REQUIRED DOCUMENTSOperations relating to cleaning, inspection, protection, preservation, packaging, storage and transportation covered by this chapter shall be performed in accordance with the requirements specified in properly identified documents （procedures, work she

12、et, instruction sheets, etc.） which must conform to the applicable paragraphs of this chapter.As the case may be, these documents relate specifically to a given component or are applicable to a workshop or construction site.They are drawn up by the Manufacturer responsible for the operation.F 6200 C

13、LASSIFICATIONF 6210 CLEANLINESS CLASSESThere are three cleanliness classes, A, B and C （in decreasing order of severity）, which are assigned in accordance with the types of system and process fluid contained inside the nuclear island.Cleanliness classification is applicable to the surfaces of compon

14、ents in contact with process fluids*.Class A is divided into subclasses according to the accessibility of surfaces:- Subclass A1 covers component surfaces which in the final stages of construction, are directly accessible for cleaning and examination. - Subclass A2 covers component surfaces which ar

15、e not assigned to subclass A1.- Subclass A2 is itself divided into further subdivisions. Subclass A21 cleanliness applies to the surfaces of components which are sensitive or of complex shape, which require special conditions for cleaning. Subclass A22 cleanliness applies to the surfaces of all othe

16、r subclass A2 components, with the exception of piping and fittings which are covered by subclass A23.F 6220 ASSIGNMENT OF COMPONENTSTO CLEANLINESS CLASSESThe equipment specification, in accordance with the requirements given below, shall specify to which cleanliness class or subclass a component or

17、 component part shall be assigned.Class A cleanliness shall apply to all components whose process fluid is the primary fluid or fluid injected into the primary fluid *.Class B cleanliness shall apply to all components whose process fluid is:- water or steam for the secondary side of the nuclear boil

18、er （except for recirculation） （1）,- water from the component cooling systems,- letdown of primary fluid （without re-injection） and liquid （stainless steel surfaces） or non-aerated gaseous effluents.Class C cleanliness shall apply to all components whose process fluid is liquid effluent （surfaces oth

19、er than stainless steel） or aerated gaseous effluent.* See definition given in Annex F I._（1） The external surface of steam generator tubes in assigned to subclass A22 until fabrication of the steam generator has been completed.F 6230 WORK AREAS REQUIREDThroughout this chapter a work area shall be t

20、aken to mean the surrounding environment in the immediate vicinity of a component or component part （for example, internal or external surfaces）.Paragraph F 6240 defines three levels of work area. They are designated I, II and III according to decreasing order of severity of requirements.Level I wor

21、k areas are required for surfaces in contact with the process fluids for subclassA21 components.Level II work areas are required for surfaces in contact with the process fluids for components covered by subclasses A1, A22 and A23.Level III work areas are required for surfaces in contact with process

22、 fluids for components covered by cleanliness classes B and C.However, for the outer part of steam generators tube bundles, level II work areas are required. The concept of work areas shall only be applicable subsequent to initial component （or component part） cleaning operations and to later operat

23、ions which may adversely affect component cleanliness. Work areas may be permanent or temporary and shall be applicable to fabrication shops and construction sites.The surrounding environment in the immediate vicinity of a component which is designated as a work area may, as the case may be, consist

24、 of an entire building or workshop, a delimited area inside a shop or on a construction site, or the wall of a component with respect to internal surfaces when adequate means of blanking off this wall are provided.F 6240 CHARACTERIZATION OF WORK AREASF 6241 LEVEL I WORK AREAThe following conditions

25、are required for level I work areas.a） EnclosureA closed or pressurized enclosure shall be permanently or temporarily installed around components.Enclosures shall provide adequate protection against external contamination and an adequate degree of cleanliness.b） Special clothingPersonnel shall wear

26、white overalls with no outside buttons （zip fasteners shall be used where possible）. Pockets shall be capable of being fastened 100% closed. Personnel shall wear a head covering, lint-free white gloves and clean shoes or overshoes.Visitors may be admitted to the work area provided that they wear whi

27、te overalls or smocks and overshoes （and white gloves where there is manual contact with components）.c） Air filteringThe make-up air for pressurized enclosures shall be clean, dry and filtered. The air shall be blown through a filter with a nominal mesh size less than 20 - 30 m.d） Access for personn

28、el and visitorsPersonnel shall have access to the work area through an air-lock or adjacent room equipped with changing facilities. Personnel shall change clothing on entering or leaving the work area.e） Smoking, eating or urinating shall not be allowed.f） Floors, walls and ceilingsFloors shall be c

29、overed with a smooth coating （permanent and removable）. If the enclosure is permanent all walls and ceilings shall not produce dust.g） Creation of dustMachining and all activities leading to the creation of dust inside the enclosure shall be limited to the strict minimum. Where such activity is unav

30、oidable, a system shall be installed to collect and evacuate dust.h） Cleaning of floorsFloors shall be kept clean at all times: when a specific activity produces unwanted material, such material shall be removed immediately.i） Mechanical protectionAdequate mechanical protection shall be provided to

31、protect components against heavy falling bodies. Such protection is mandatory on the plant for reactor internals.F 6242 LEVEL II WORK AREAThe following conditions are required for level II work areas.a） Special clothingPersonnel shall wear clean clothes and clean shoes or overshoes.b） PollutionEvery precaution shall be taken to limit the risk of pollution by the personnel （food - drinks - cigarettes, etc.）