ML24326A223
| ML24326A223 | |
| Person / Time | |
|---|---|
| Site: | 07109196 |
| Issue date: | 12/26/2024 |
| From: | Storage and Transportation Licensing Branch |
| To: | |
| Shared Package | |
| ML24326A222 | List: |
| References | |
| Download: ML24326A223 (1) | |
Text
10 CFR 71.95 REPORT EVALUATION FORM Docket No.: 71-9196 Package Model No.: UX-30 Report Submitted By: Westinghouse Report Date: 04/15/2024 Report ADAMS Accession No.: ML24117A073 Review the incoming report to determine if additional Commission or staff action is warranted. The review should consider whether the report identifies a generic defect or problem with the package design and the safety significance of the issue.
Note that a high safety significance represents a potential for significant radiation exposure, medium safety significance represents a potential for some moderate radiation exposure, and low safety significance represents little or no potential for radiation exposure.
- 1. The report identifies:
__ Significant reduction in the effectiveness of a package during use;
__ Defect with a safety significance; Shipment in which conditions of the approval were not observed.
- 2. What is the safety significance? ___ High
__ Medium Low
- 3. Summary of the report:
On February 16, 2024, during a receipt inspection of Six UX-30 overpack (packages), transported from Westinghouses Columbia Fuel Fabrication Facility to the Urenco USAs facility, a Urenco employee found one of the 2-inch ball lock pins disengaged and dangling by its lanyard from one of the UX-30 model overpack. This condition was found during a receipt inspection at the Urenco USA facility in Eunice, New Mexico. The ball lock pin was engaged and deemed satisfactory during the Westinghouse pre-shipment inspection, as stated in the inspection report.
The UX-30 overpack is a right circular cylinder constructed of two stainless steel shells with the volume between the shells filled with 6-inch-thick foam. The package "halves" are secured with ten indexed, cross-looking "ball lock" pins. In addition to the ball lock pins, during transport, each package was also secured in place on a transport cradle equipped with metal straps around it.
There are three main purposes of the UX-30 overpack: 1) to provide overall thermal protection for postulated accident conditions; 2) to provide impact protection for the valve; and 3) to provide minimum spacing for criticality control. The overpack thus provides overall impact protection for the cylinder as a containment boundary, although the impact protection is not credited during the cylinder drop test.
The malfunction of one of the ten ball lock pins at no time compromised the main objectives of the overpack, as demonstrated by the safe and secure delivery of the UF cylinder contained within the package at its destination with no release of radioactive material as verified by the receipt inspection.
The corrective actions proposed by Westinghouse will aid in minimizing a similar event from occurring. These corrective actions could be subjected for review during the next NRC inspection of the UX-30 overpack.
10 CFR 71.95 REPORT EVALUATION FORM Docket No.: 71-9196 Package Model No.: UX-30 Report Submitted By: Westinghouse Report Date: 04/15/2024 Report ADAMS Accession No.: ML24117A073 Potential cause:
The licensee indicates that Westinghouse procedure for shipment of the heeled cylinders was completed and documented as required by the UX-30 package license and safety analysis report (SAR) chapter 7, operating procedures.
The licensee notes that the abnormal condition for this shipment predictably occurred either during installation of the pin at the Westinghouse facility or during the overpack shipment from Hopkins, South Carolina to Eunice, New Mexico. Further, the licensee postulates that failure of the ball lock pin is often associated with mechanical failure of the spring mechanism that engages the ball lock, wear or corrosion of the ball lock, or the accumulation of debris within the ball lock spring mechanism.
- 4. Corrective actions taken by the licensee:
Licensee captured the event in its Corrective Action Program (CAP Issue Report 2024-2239).
Licensee conducted a meeting / training session with the Westinghouse Container Services operators and Nuclear Fuel Transport Specialists where discussion of operational requirements of the UX-30 overpack and the potential failure points regarding the inspection and securement of ball lock pins prior to shipment were covered.
Licensee comments to reviewing and revising the UX-30 UF cylinder overpack inspection and maintenance form (CF-85-006) and procedure (TR-306) as applicable to strengthen the inspection protocol and include revision for use on inbound and outbound UF shipments.
- 5. Staff comments:
There is no package failure and no safety consequence. No leakage of contents due to the non-conformance and no reduction in the performance of any packaging.
- 6. Staff conclusion:
The report does NOT identify generic design or license/certificate issues that warrant additional Commission or staff action. This report is considered closed.
There is a need to take additional action. Provide a summary of the bases and recommended actions:
ML24326A222 (pkg), ML24326A223 (form)
OFFICE NMSS/DFM NMSS/DFM NMSS/DFM NAME HYilma WWheatley YDiaz-Sanabria DATE 11/25/2024 11/25/2024 12/20/2024