The RADTRAN and RISKIND transportation risk analysis computer codes are the primary tools used to estimate dose consequences and risks associated with the transport of radioactive material. Over the years, some of the mathematical models used within the two computer codes have been updated and the methodologies to calculate input parameters have been improved. In addition, both codes have been evaluated for ease of use and appropriateness of application and verified against other computer codes that perform similar calculations. However, neither code has been validated against experimental data. This report discusses the results of five sets of experimental measurements used to partially validate the specific mathematical models used to predict the dose to an individual due to a passing shipment of radioactive material within the RADTRAN and RISKIND computer codes. Based on the comparisons it was found that RISKIND most closely predicted the measured dose in the majority of the investigated scenarios and that 12 out of 14 cases demonstrate the expected inverse relationship between the measured dose and the distance of closest approach. Only half of the data demonstrated the expected inverse relationship between dose and speed of travel.

No abstract

No abstract

No abstract

A recent long term boric acid release event at a Midwest PWR power station necessitated re-assessment of the continued viability of the plant's Environmental Qualification (EQ) Program equipment located inside Containment. The event was found to be caused by a small crack in a Control Rod Drive Mechanism weld at the Reactor Vessel Closure Head. Although short term effects of boric acid exposure have been demonstrated as acceptable over the years through numerous EQ testing and test reports, the longer term effects (in this case perhaps as long as six to eight years) were considered unknown in terms of future accident mitigation capability. To address this issue, a Discovery Action Plan was developed to assess and restore the Containment's EQ Program health. This Discovery Action Plan included criteria for screen-out of equipment with no susceptibility to boric acid corrosion, a categorization methodology for remaining equipment based on potential for boric acid ingress and other types of susceptibility, and inspection procedural details. This paper reports on the comprehensive approach for the development of the Discovery Action Plan and the successful results of the associated inspection program.0-7803-8257