COMPARISONS WITH ANSI N432-1980 AND ISO-3999-2004 Vienna, Austria - 23 - 27 June 2014 VIENNA INTERNATIONAL CENTRE Presented By R. D. (Donny) Dicharry,

COMPARISONS WITH ANSI N432-1980 AND ISO-3999-2004

Vienna, Austria - 23 - 27 June 2014VIENNA INTERNATIONAL CENTRE

Presented By R. D. (Donny) Dicharry, President

HIGHLIGHTS OF DRAFT ANSI N43.9

Source Production & Equipment Company, Inc. (SPEC) St. Rose, Louisiana USA

INTERNATIONAL ATOMIC ENERGY AGENCY

RADIATION SAFETY IN INDUSTRIAL RADIOGRAPHYTECHNICAL MEETING ON

Specify quality assurance program requirements for entities that engage in the design, manufacture, testing or repair of industrial gamma radiography equipment and source changers

QUALITY ASSURANCE

Revise qualification requirements for associated equipment

REVISE QUALIFICATION REQUIREMENTS

Use clear, objective terms that will facilitate compliance.

CLEAR, OBJECTIVE TERMS

PRIMARY OBJECTIVES

The ISO 3999 was used as a reference document during the revision; initially ISO-3999-1-2000 and then ISO-3999-2004 later in the process. The subcommittee sought to harmonize with ISO-3999 as much as practical.

REFERENCE

APPROVAL

NUCLEAR REGULATORY COMMISSIONThe NRC has indicated their intention to incorporate this edition into regulation.

The Working Group consisted of equal representation from manufacturers, users and regulators.

ANSI N432-1980 ISO-3999-2004 ANSI N43.9DRAFT

COMPARISONS WITH ANSI N432-1980 AND ISO-3999-2004HIGHLIGHTS OF DRAFT ANSI N43.9


This International Standard specifies the performance, design and test requirements of apparatus for gammaradiography with portable, mobile and fixed exposure containers of the various categories defined in Clause 4.

The standard includes the qualification requirements for those who engage in the design, fabrication, assembly, testing, repair or modification of industrial gamma radiography equipment or source changers.

SCOPE




Gamma Radiography System. All components necessary to make radiographicexposures, including the exposure device, source assembly, control, and other components associated with positioning the source such as source guide tubes, exposure head, and collimators, if used.

DEFINITIONS

apparatus for industrial gamma radiographyapparatus including an exposure container, a source assembly, and as applicable, a remote control, a projection sheath, an exposure head, and accessories designed to enable radiation emitted by a sealed radioactive source to be used for industrial radiography purposes

Industrial Gamma Radiography System: All integral components necessary to perform industrial radiography, including the exposure device, source assembly, and as applicable, associated equipment.




DEFINITIONS

Output Activity: The exposure rate of the sealed source divided by the gamma constant (See table below).

OUTPUT ACTIVITY

Radionuclide Gamma Constant

Iridium-192 0.48 R/h/Ci @ 1 m 130 Sv/h/GBq @ 1 m

Cesium-137 0.32 R/h/Ci @ 1 m 86 Sv/h/GBq @ 1 m

Cobalt-60 1.30 R/h/Ci @ 1 m 351 Sv/h/GBq @ 1 m

Selenium-75 0.20 R/h/Ci @ 1 m 54 Sv/h/GBq @ 1 m

Ytterbium-175 0.125 R/h/Ci @ 1 m 34 Sv/h/GBq @ 1 m

The activity of the source shall be determined by measuring its output at 1 m and expressing its activity in curies (becquerels) derived from the following values:

OUTPUT ACTIVITY

Radionuclide Gamma Constant

Iridium-192 0.48 R/h-Ci @ 1 m 0.93 aA/kg-Bq @ 1 m

Cobalt-60 1.30 R/h-Ci @ 1 m 2.52 aA/kg-Bq @ 1 m

Cesium-137 0.32 R/h-Ci @ 1 m 0.62 aA/kg-Bq @ 1 m

Radium-226 0.20 R/h-Ci @ 1 m 1.60 aA/kg-Bq @ 1 m




DEVICE CLASS & CATEGORY

Category X:Apparatus for gamma radiography designed for special applications where the unique nature of the special application precludes full compliance with this International Standard, for example: self propelled intra-tubular gamma radiography apparatus (pipe-line crawler); gamma radiography apparatus for underwater use. The exposure container shall comply with this International Standard to the maximum extent possible.

Category X: Equipment for industrial gamma radiography designed for special applications where the unique nature of the special application precludes full compliance with ANSI/HPS N43.9, for example, self-propelled industrial gamma radiography equipment (pipe-line crawlers). The industrial gamma radiography equipment shall comply with this standard to the maximum extent possible.




GENERAL DESIGN REQUIREMENTS

Exposure devices shall be designed with due regard for the conditions which may be encountered during use.

(Corrosion, water, mud, sand, or other foreign matter.)

Apparatus for industrial gamma radiography shall be designed for the conditions likely to be encountered in use.

NOTE If feasible, a test for continued operation under environmental conditions of moisture, mud, sand and otherforeign materials, will be developed and will be issued as an addendum.

Radiography equipment shall be designed for the conditions likely to be encountered in use when the equipment is used and maintained in accordance with the manufacturer’s instructions. The design of the equipment shall minimize the effect of the environmental conditions of moisture, sand, mud, and other foreign matter that the equipment is likely to encounter during use.





Wherever depleted uranium is used for shielding…. the source tunnel through the depleted uranium shall…. limit abrasion, corrosion and consequential deformation.

Inspection and maintenanceFor Category II exposure devices that contain a depleted uranium shield the instructions shall include an inspection of the exposure device source path for wear-through to the shield in accordance with Appendix A.





Limitation of abrasion shall be demonstrated by satisfactory performance of a test consisting of the examination of the simulated source assembly, to demonstrate that there is no abrasion of the source tunnel which could lead to contamination by depleted uranium.

Use a swab to wipe the interior surface of the exposure device source path (S-Tube) Test the first swab for DU contamination. If the wipe test indicates DU contamination an inspection (e.g., visual inspection, eddy current, etc.) of the interior of the exposure device source path shall be performed. If the inspection indicates that the exposure device source path (S-Tube) is worn through to the DU shield the exposure device shall be removed from service.




TESTS

Vibration-resistance test The purpose of the test is to determine the natural frequencies which are characteristic of the exposure container and to study the change in these natural frequencies in order to determine if the exposure containeris able to withstand vibrations experienced during transportation.




ACCOMPANYING DOCUMENTS

Certificates of the manufacturerWith each apparatus, the manufacturer shall provide a certificate of conformity to show compliance with this International Standard




ACCOMPANYING DOCUMENTS

Inspection, maintenance and repair procedures

Inspection and maintenance procedures




QUALITY ASSURANCE PROGRAM

A quality-assurance programme, such as that specified in ISO 9000, ISO 9001 or ISO 9004 or the IAEA regulations STI-PUB 998 for the design, manufacture, testing, transport, inspection and documentation of all apparatus for industrial gamma radiography, shall be established.

Those who engage in the design, fabrication, assembly, testing, repair or modification of radiography equipment or source changers shall operate under the control of a quality assurance (QA) program. The QA program shall include the requirements of 10 CFR Part 71 Subpart H, ISO 9001 or similar elements. Compliance with the QA program shall be certified by an independent entity.



“There is no safety in engineering. Safety if not in things, but in the way we deal with them; safety is either in the operator it is nowhere.”Dr. G.J.S.Wilde Professor Emeritus of Psychology Queen's University Kingston, Ontario, Canada [email protected]

Target Risk <riskhomeostasis.org>

mailto:[email protected]





WORKS CITED:

American National Standard N432; Radiological Safety for the Design and Construction of Apparatus for Gamma Radiography. New York: American National Standards Institute, Approve August 15, Issued January 1981.

International Standard ISO 3999:2004(E); Radiation protection – Apparatus for industrial gamma radiography – Specifications for performance, design and test. Geneva, Switzerland. Second edition 2004-12-15.

Questions?

COMPARISONS WITH ANSI N432-1980 AND ISO-3999-2004 Vienna, Austria - 23 - 27 June 2014 VIENNA INTERNATIONAL CENTRE Presented By R. D. (Donny) Dicharry,

Documents

ansi n432

source assembly

sealed source

draft comparisons

sealed radioactive source

exposure device

exposure head

source guide tubes