ENS 56643
ENS Event | |
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22:00 Jul 27, 2023 | |
Title | Fuel Element Inspection Failure |
Event Description | The following information was provided by the licensee via email:
This notification is being made per the requirements of technical specification 6.7.2 During the facility's routine 2023 fuel inspection on July 27th, 2023, it was discovered that a stainless steel clad standard TRIGA 20/20 element did not pass its visual inspection. The visual inspection of the element, made via an underwater camera with approximately 2 times optical magnification, showed inward pitting and unusual discoloration in the cladding of the fueled section of the element. The elongation and transverse bend of the element were measured and were within tolerance per the facility's technical specifications. The cause of this pitting is unknown at this time. The element has been permanently retired from service and placed in an in-tank fuel storage rack. No unusual radiation readings were observed leading up to the inspection or during the inspection. Therefore, it is very likely that the integrity of the cladding has not been compromised and no fission products have escaped as a result of the pitting. Though not required by the facility's technical specifications, [McClellan Nuclear Research Center] (MNRC) staff is proceeding with the inspection of all adjacent fuel elements and all other standard elements that have not been inspected within the last year. This inspection corresponds to approximately 85% of all in-core elements. The expected completion date of this inspection is August 2nd. Detailed results of this inspection will be provided in an incident report to the NRC no later than August 10, 2023. |
Where | |
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Univ Of California Davis Mcclellan (Cald) Sacramento, California (NRC Region 0) | |
License number: | R-130 |
Reporting | |
Non | |
Time - Person (Reporting Time:+17.35 h0.723 days <br />0.103 weeks <br />0.0238 months <br />) | |
Opened: | Wesley Frey 15:21 Jul 28, 2023 |
NRC Officer: | Bethany Cecere |
Last Updated: | Jul 28, 2023 |
56643 - NRC Website
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University of California-Davis with Non | |
WEEKMONTHYEARENS 566432023-07-27T22:00:00027 July 2023 22:00:00
[Table view]Non Fuel Element Inspection Failure ENS 563312023-01-31T08:00:00031 January 2023 08:00:00 Non Limiting Condition of Operation Not Met 2023-07-27T22:00:00 | |