05000321/FIN-2009005-07
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | Unit 1 Technical Specification 3.4.4, RCS Operational Leakage, requires no RCS pressure boundary leakage while operating in Modes 1, 2 and 3. Contrary to this, on May 2, 2008, the licensee reported that RCS pressure boundary leakage existed while the unit was in Mode 1. The leakage was discovered to be from a pin-hole located in a one-inch stainless steel original instrument pipe for the A main steam line flow instrument. The cause of the leak was found to be intergranular stress corrosion cracking (IGSCC). The stress on this pipe was attributed to poor weld fit up of the pipe and poor weld quality that both existed since original construction. Also, it was discovered that a pipe restraint was not installed as required by the plants piping drawing. This issue was documented in CR 2008103067. The affected piping was replaced prior to restart of the unit. The violation was determined to be of very low safety significance in that the unidentified leakage into the drywell, assuming worst case degradation of the pin hole leak, was approximately 0.05 gallons per minute (gpm) of the TS allowable limit of 5 gpm for unidentified leakage. In addition the violation did not affect the ability of other mitigating systems to perform their safety function |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2009005 Section 4OA7 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events, Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Caballero D Jones E Morris G Macdonald J Eargle P Niebaum S Shaeffer |
| INPO aspect | |
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Finding - Hatch - IR 05000321/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2009Q4
Self-Identified List (Hatch)
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