The following was received via fax:
Preferred Metal Technologies (PMT) was notified by Steris Isomedix Services that the applied radiation dose reported on their Component Irradiation Certificates did not account for all the uncertainties involved (i.e. density of unrelated products in carriers, off-carrier location within the irradiator and Cobalt-60 source decay). This potential defect was originally identified as part of NRC Inspection Report No. 99901445/2014-201.
After a thorough review of all purchase orders issued to Steris Isomedix Services and PMT Projects that the irradiation test results were utilized on, PMT has determined that there are two projects where the applied radiation dose may have failed to meet the minimum required radiation dose to ensure that the safety related equipment would continue to operate satisfactorily during and after an accident. The details of those two projects are as follows:
N1839 - Tennessee Valley Authority, Browns Ferry - 6 (Six) Electric Spring Return Actuators - Purchase Order #473351.
N1893 - Commission Federal de Electricidad, Laguna Verde - 32 (Thirty Two) Damper Assemblies - Purchase Order #700419016.
Tim Stewart, Vice President Nuclear
Preferred Metal Technologies, Inc.
140 East Tower Drive
Burr Ridge, Illinois 60527
Preferred Metal Technologies Report Number: 14-01.
- * * UPDATE FROM TIM STEWART TO DONALD NORWOOD AT 1636 EDT ON 7/30/2014 * * *
The following information was received via facsimile:
In summary, additional radiation exposure testing was performed, post-radiation operability was verified, and it was confirmed that all affected equipment would continue to operate satisfactorily during a design basis event. No equipment upgrades or replacement is required as the supplied equipment was verified to meet the applicable technical requirements.
Notified R2DO (O'Donohue), R3DO (Lipa), and the Part 21 Group.