ISO 7195 pdf download – Nuclear energy一Packaging of uranium hexafluoride (UF6) for transport

ISO 7195 pdf download - Nuclear energy一Packaging of uranium hexafluoride (UF6) for transport

ISO 7195 pdf download – Nuclear energy一Packaging of uranium hexafluoride (UF6) for transport.
62.1.1 General
The manufacturing process for cybnders shal conform to this International Standard and the pressure vessel code requirements as agreed with the cylinder purchaser’s competent authority and shall conform to the applicable drawings and specifications Approval shait be obtained from a qualfied inspector,
Couplings, after having cooled from being welded into the pressure envelope and before the valve or poe plugisinsected,mayhavea 1 in 11 1I2NGTor1 li2in 11 1/2NGTLap.asappropriate.used,ifnecessary,to lightly chase the lhrads. Thread forms shall conform to ANSIICOAV-1. Conformity to specification of the thread and coupling shal be confirmed in accordance with the agreed quality control plan
62.12 Weldlnglbrazlng
Surfaces to be welded or brazed shall be free from foreign mailer (oil, grease. rust, etc.). Intenor surfaces of the cylinder shall be mspected and cleaned before closure is effected.
UF6 cylinder welds and brazes shall be designed such that they conform to the requirements of the pressure vessel code or other code agreed with the competent authority and be formed in accordance with procedures given in the code(s) agreed with the competent authority. Welds detailed in Figures 1, 5 to 8 and 10 to 14 may be taken as typical. Al welds shall be full penetration welds unless otherwise specified. Circumferential cylinder seams should be welded without backing rings. Optionally. orcumferential cylinder seams may be welded with backing rings, as shown in Figure 1. Welders and brazers shell be qualified to each specific procedure used in cylinder fabrication, Each weld procedure shall be qualified with wnpact testing. This testing shall be as specified by the pressure vessel code utilized for the material being welded. Procedures and quabfications shall be documented as required by the specified codes.
62.1.3 InspectIon of weldsibrazes
Alt welds and brazes shall be visually inspected for proper fitting of the joints, full compliance with the previously qualified procedure arid absence of imperfections and defects in the finished joints as specified by the pressure vessel code requwements. As a minimum, each cylinder shaM be radiographed in accordance with code requirements and shall be spot radiographed at the 9unctlon of the longitudinal seam and the cicumferential head weld in accordance with code acceptance criteria. Stiffening ring butt welds shall be examined to ensure full weld penetration. The qualified inspector shall examine radiographs.
6.2.2 Cylinder capacity and tare
The manufacturer shall determine the cylinder capacity by completely filling it with water. The mass and temperature of water shall be recorded and shall be accurate to t 0,1 %. The water capacity, in kilograms (pounds) at 15.6 C (60 F), shall be determined and shaM be not less than the specified minimum for the cylinder design (see Table 3 or cylinder design parameters).
On completion of the manufacturing process, painting and evacuation of the cylinder, the tare weight, In kilograms (pounds) at the specified internal pressure. straIt be determined, The cylinder mass and internal pressure shall be recorded and shall be accurate to ± 0,1 %. The valve protector. it provided, shall not be inckided in the tare weight.
6.2.3 CleanIng Interior of the cylinders
After hydrostatic testing, the inside of the cylinder shaM be inspected and thoroughly cleaned of grease, oil, scale, slag, oxides, dirt, moisture and other foreign matter. The surfaces shall be dean, dry and free of contamination. The cleaning method shall be agreed with the purchaser. Valves
Valves That are procured, cleaned. lubricated and assembled in sealed packages using quality control practices conforming to Clause 4 may be instaled in ctlinders as received. Otherwise, prior to instalation into the cylinder, the valve shall be disassembled and cleaned to remove all traces of machining lubricants, metal chips, oxide film and other foreign substances wi accordance with
Prior to re-use, valves that have been removed from cylinders shall be refurb.shed In accordance with a qualify control plan conforming to the requirements of the competent authority and to the drawings and specification of this International Standard.
6.2.4 Testing
6,2.4.1 Hydrostatic testing of cylinders
Cylinders shall be hydrostatically tested No leakage shall be permitted. The test presse shall be twice the maxarium admissible working pressure. (gauge pressure). The MAWP shall be rounded up to two significant figures. Prior to inspection of the cylinder for leaks, the pressure shall be lowered to 1,5 times the MAWP or to a gauge pressure of 1,38 MPa (200 lbflln2 gauge), whichever is the higher. Defects shall be repaired In accordance with the appropriate manufacti.aing and welding standards within the quality control procedure and as permitted in the relevant code. After being repaired, the cylinder shall then be subjected to a retest in accordance with the original requirements. Packages for transport shall conform to IAEA TS-R-1 :1996 (as revIsed 2003). paragraph 630 (a).

Leave a Reply

Your email address will not be published. Required fields are marked *