ASME N509:2002 pdf free download

ASME N509:2002 pdf free download.NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS.
ASME N509 covers requirements For the design, construction, and qualification and acceptance testing of the air-deaning units and components which make up Engineered Safety Feature (ESFI and other high efficiency air and gas treatment systems used in nuclear power plants.
1.1 LimItations
The Standard does not cover swng of a coniplete nuclear air treatment system, redundancy or single-lailure requirements It applies only to systems which employ particulate filtration, ambient-temperature adsorption. or both, as the principal functional mcchanism. It does not apply to condenser off-gas systems. Also, it does not apply to other applications that employ primarily gas storage or holdup, cryogenic adsorption or fractionation, or solvent absorption as the principal method of gas treatment, Nor does the Standard cover requirements for containnwnt isolation valves, recoinbiners, comfort heating, air-conditioning, or ventibtion to achieve ordinary cooling or industrial hygiene nbectives. Field acceptance testing of nuclear air-treatment systems is covered in ASME AG-I. Section TA (the primary reference was to ASME N510-1989).
12 Purpose
The Standard identifies and establishes requirements for filters, adsorbers. moisture separators, air heaters, filter housings, dampers, valves, fans, ducts, and other components of nuclear air-treatment systems for a specific application in a nuclear power plant. The Standard also establishes requirements For operability, maintainahilIt and testability of systems necessary for the maim tenance of system reliability for the design conditions. Qualification and acceptance testing pruvisions arc specified to verily the adequacy of the air-cleaning unit and component design, to verify that components have been properly fabricated and installed, and that the system will pcrfomt in accordance with specifkation requirements.
2 APPUCABLE DOCUMENTS
The following documents supplement this Standard and are a part of it to the extent indicated in the text. The issue of the referenced document noted below shall be in effect. If no date is listed, then the issue of the referenced document in effect at the time of the Purchase Order shall apply.
After filters and adsorbers are unpacked and opened to the atmosphere, extreme care is required to ensure that degradation does not occur either from espesure before loading or by system operation during testing, Construction, repair, or plant modificatiost Prelilters and (EPAs are particularly vuLnerable to degradation due to cottstn.iction dusi If additional welding is required on the filter housing after HEPA filters or adsorbent is installed, the HEPA filters arid adsorbent must be removed before starting this work. l-IEI’A Filters are very susceptible to pinholes from welding sparks. Carbon adsorbent is aged or poisoned by trace concentrations of vapors such as solvents, paint off-gassing, engine exhaust arid welding fumes, or by moisture condensation.
8 QUALITY ASSURANCE
The design organilahnn. manufacturers of components, and constructorS (including subcontractors) shall each establish and comply with a comprehensive quality assurance program and plan which meets the requirements of ASME NQA-l.
9 ACCEPTANCE TESTING
Acceptance testing shall be in accordance with ASME AG-I, Section TA and operational testing shall be In accordance with ASME N510. It is recommended that prefilters be installed before fan is first turned on to protect filters and fans from construction debris, and the system Ian(s) should be operated for at least 25 hr before installation of HEPA filters and adsoi’bers to clean up the worst of construction dirt (artificial resistance may have to be added during this operation to prevent overloading of the Ian motor). I’rcfilters may have to be replaced after this evolution. For personnel protection. personnel should not enter housing until Ian has operated for a sufficient period of time to remove air entrain- able debris, After installing the HEI’A filters and adsorbers, the system heaters should be operated, where provided, to reduce, if necesaarv, the relative humidity of the air prior to making tests on the adsorbers.
All dampers. valves, and controls shall be exereised through their lull operating range and shown to be in good operating condition before the start of testing. After completion of acceptance testing, the system shall be sealed and the fan controls locked out to protect the components during the remainder of construction operations at the site.