05000263/FIN-2010008-01
Finding | |
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| Title | Potential concern with the one-time inspection program related to butt welds |
| Description | In the March 25, 2006, license renewal annual update (ML060800360), the licensee provided details of changes made to the original license renewal application. With respect to Class 1 Small-Bore piping, the licensee committed to the following:
Upon further review subsequent to submitting the LRA to identify inspection locations, it was determined that all piping in this inspection group is of actual diameter 2 inches and less. In accordance with the plant piping specification, only socket weld connections are used in such applications and no butt welds. Therefore, inspections of this piping for the One-Time Inspection Program will consist of VT-2 examinations during pressure testing for system leaks upon return to service from outages and destructive examinations of any socket welds removed from service prior to the period of extended operation. In a letter dated May 14, 2010 (ML101370259), the licensee notified the NRC of the existence of a limited number of small-bore stainless-steel butt weld connections (less than 4 inches in diameter) which are contrary to the requirements of plant piping specifications. As a result, the licensee changed the one-time inspection commitment again and committed to perform augmented ISI volumetric examinations of ASME Class I stainless steel small-bore piping butt welds with a 2-inch nominal pipe size through less than 4-inch nominal pipe size in accordance with the ISI aging management program. The inspectors questioned whether the identification of stainless-steel butt welds constituted a newly identified component or whether the commitment change was appropriate. This is considered an unresolved item (URI 05000263/2010008-01) pending further discussions with the NRC program office. |
| Site: | Monticello  |
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| Report | IR 05000263/2010008 Section 4OA5 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71003 |
| Inspectors (proximate) | N Shah A Dahbur K Riemer M Phalen S Thomas D Jones P Voss C Tilton P Cardona-Moralesa Stonel Haeg S Sheldon T Bilik |
| INPO aspect | |
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Finding - Monticello - IR 05000263/2010008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2009Q2
Self-Identified List (Monticello)
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