05000454/FIN-2010007-02
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Finding | |
|---|---|
| Title | Non-Inert Atmosphere May Challenge Fuel Integrity |
| Description | The inspectors identified a URI associated with the licensees adherence to Holtec CoC 1014, Amendment 3, Appendix B, Section 3.4.10, during vacuum drying operations. Specifically, Appendix B 3.4.10 states that users shall establish procedural and/or mechanical barriers to ensure that during loading operations and unloading operations, either the fuel cladding is covered by water, or the MPC is filled with an inert gas. SFST ISG-22 discusses that cladding and fuel damage may occur if: a) the fuel has pinhole leaks or hairline cracks; and b) air is introduced into a dry fuel canister while fuel is at an elevated temperature. The Holtec CoC defines intact fuel as fuel assemblies without known or suspected cladding defects greater than pinhole leaks or hairline cracks and which can be handled by normal means. The Holtec FSAR indicates that during vacuum drying operations, fuel cladding temperatures are designed to be less than 1058oF, but could be as high as 1040oF. The inspectors observed that while under vacuum, a hose rupture would allow air to flow back into the MPC. The licensee used commercial grade equipment hosing and valves, to complete the vacuum drying process. The licensee had no compensatory measures in place to promptly isolate and/or backfill the canister. The licensee documented this concern in its corrective action program under IR1116408, NRC Potential URIs from ISFSI Reactive Inspection. Currently, the licensee has stated that they have selected fuel with no known pinhole leaks or hairline cracks. This determination was made from a review of fuel sipping and chemistry records. The licensee has added additional contingency procedures to appropriately recognize a hose failure and backfill the canister with an inert gas. This will remain an unresolved issue pending further review of whether a postulated vacuum hose break would result in fuel damage. (URI 05000454/2010007-02; 05000455/2010007-02; 07200068/2010002-02, Non-Inert Atmosphere May Challenge Fuel Integrity.) |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2010007 Section 4OA5 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Mcgee J Robbins M Holmberg M Learn B Metrow C Thompson E Duncan J Cassidyc Lipae Love J Nicholson J Robbins J Solis M Learn |
| INPO aspect | |
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Finding - Byron - IR 05000454/2010007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2010Q3
Self-Identified List (Byron)
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