The following was provided by the licensee:
This report is being made pursuant to 10CFR50.72(b)(3)(ii)(A). At 1830 on March 12, 2005, during the U-2 vessel pressure test, a leak was identified on the 2B21-F028D. The drain piping weld had pinhole leaks at the weld with a leak rate of 60 drops per minute. Due to welding or material defects in ASME Class 1 components, Technical Requirement Manual 3.4.a., condition A was entered. The component was isolated and corrective actions are in progress to repair the leakage. Repairs will be completed and tested prior to startup.
The valve 2B21-F028D is located in the Main Steam system downstream of the outboard main steam isolation valve. The leaking weld is the connecting weld of the valve body to the drain line. There was no prior history of repair on the valve or weld from the last outage. The licensee stated no indication was present to indicate the valve was leaking steam during normal operation.
The licensee notified the NRC Resident Inspector.
