ANSI HPS-N43.10-2001 pdf download Safe Design and Use of Panoramic, Wet Source Storage Gamma Irradiators (Category IV) and Dry Source Storage Gamma Irradiators (Category II)
Each intended use of the irradiator (i.e., irradiation of different products) should be evaluated to ensure that safety of the irradiator is not compromised. 3.4 Operator Attendance Attendance during operation shall, as a minimum, meet with the requirements of the pertinent regulatory and controlling authority.
4. Sealed Sources
4.1 General All sealed sources shall be authorized under the appropriate regulatory criteria for use in the irradiator as designated in the license. For general sealed source requirements, refer to American National Standard ANSI/HPS N43.6 [6], Sealed Radioactive Sources, Classification. In addition to the general requirements, the manufacturer and user shall consider the possible effects of thermal cycling where wet source storage is used.
4.2 Performance Requirements and Classification Sources used in Category II and Category IV irradiators shall have a minimum classification as stated in American National Standard ANSI/HPS N43.6-1997 and meet the bend test requirement specified in Part
4.2.1. To improve sealed source corrosion resistance, all outer encapsulation components shall meet the same material specification. Consideration of thermal fatigue of the source during irradiator operation shall be included in the selection of materials.
4.2.1 Bend Test Classification Requirement. Sealed sources used in Category IV and Category II irradiators with an L/D of 15 or more, where L = active length and D = minimum outer capsule outside diameter of the active length or the smallest cross-sectional dimension of non- circular sources, shall have a minimum bend test classification of 5 based on the bend test procedures shown in Part 4.3, “Sealed Source Bend Test.” Compliance with the test is determined by the ability of the sealed source to maintain its integrity, after the test is performed, as defined in American National Standard ANSI/HPS N43.6. A source shall have complied with the bend test if the source, due to its flexibility, passes through the test jig while under test (the center of the force cylinder passes through the centerline of the two support cylinders) and maintains its integrity.
4.3 Sealed Source Bend Test Bend test classifications are based on applied static force, using the following test parameters. All three cylinders shall not rotate and shall have longitudinal axes that are parallel to each other. The cylinders shall have smooth surfaces and shall be of sufficient length to accommodate the full contact surface of the capsule during the test procedure. All cylinders are to be of a solid nature. Cylinder hardness – ROCKWELL ‘C’ 50 – 55. In applying the static force, care should be taken not to apply this force suddenly as this will increase the effective force. The applicable static force shall be applied at the most vulnerable part of the sealed source. Figure 1 shows the bend test parameters.
ANSI HPS-N43.10-2001 pdf download
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