05000440/FIN-2010003-06
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Finding | |
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| Title | Failure to Perform a Hydrostatic Test in Accordance with ASME Code |
| Description | The inspectors identified an unresolved item (URI) concerning licensee actions to test two 24 diameter Dresser style couplings installed to repair a leaking coupling in the ESW B piping. On March 5, 2009, the inspectors observed repair/replacement activities on the licensees buried ESW system. A Dresser style coupling used to join sections of the system piping had failed and was leaking around the seals. The failure appeared to be due, at least in part, to cold spring of the piping since the ends of the piping joined by the coupling were offset and separated. The offset and separation of the piping prevented simple replacement of the old coupling with a new one. The licensee elected to remove and replace the offset section of the piping, and replace the one coupling with two couplings to join the approximately 6 long section of piping that had been removed. Through a records review of the related work package, the inspectors identified that the licensee had specified an incorrect hydrostatic test hold time of 3 minutes to the vendor for the testing of the two pipe couplings. The required ASME Section III hydrostatic test pressure for the Dresser style couplings (piping components) used to join the 6 section of pipe to the rest of the piping in the repair of the 24 ESW piping system should have been a minimum total time of 10 minutes. A 10 minute hold time was also indicated in the vendors hydrostatic testing procedure for ASME Section III components. The actual hold times performed by the vendor ranged from 4 to 6 minutes as indicated on the shipping documents. The licensee (procurement engineering) stated that they had treated the component/coupling as ASME III material rather than as an ASME III component. After further evaluation of the inspectors concerns the licensee further stated that not only is the coupling not a component by Code definition, but that the Dresser Style 38 middle rings (the pressure retaining portion of the coupling) were the only parts of the couplings requiring any testing and that there was no minimum test time specified in the Code. The licensee also felt that the hold time specified was more conservative than the 5 second hydrostatic test of seam welded pipe which they stated is all that is required by the Code for a seam weld repair. The 180 second minimum hydrostatic testing hold time requirement specified in the purchase order for the couplings was based on requirements found in ANSI B16.5 Steel Pipe Flanges and Flanged Fittings, and Standard Practice (SP) 61, Pressure Testing of Steel Valves. The basis for the use of these documents, through discussion with the licensee, appeared to stem from an earlier Engineering Report, ANSI/ASME Code Reconciliation for Replacement Material, Parts and Components, which compared and evaluated pressure-temperature ratings in B16.5 and ASME Section III. The report, which had been performed for an alternative application, dealt with, among other things, flanged fittings and valves, but not couplings. The licensee stated that Subsection ND does not directly address hydrostatic testing of the item so they elected to use these documents as guidance to establish the testing requirements. Specifically they stated that they used the hydrotest requirement for valves indicated in SP 61 in the procurement package for the hydrostatic test duration. However, the inspectors noted that Section III hydrostatic test requirements for valves also specifies a minimum hold time of 10 minutes, and the ASME Code requirements supersede those of the Manufacturers Standardization Society. At the conclusion of the inspection period the inspectors and the licensee were continuing discussions regarding the appropriate test requirements. Pending the results of additional discussions and additional information, this issue will remain open as a URI. (URI 05000440/2010003-06; Failure to Perform a Hydrostatic Test in Accordance with ASME Code). |
| Site: | Perry  |
|---|---|
| Report | IR 05000440/2010003 Section 4OA2 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Winter F Ramirez M Marshfield T Bilik W Slawinski M Phalen R Baker J Bozga N Feliz T Hartman V Myersj Cameronl Jones M Marshfield M Phalen P Smagacz R Edwards R Leidy T Hartman V Myers W Slawinski |
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Finding - Perry - IR 05000440/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2010Q2
Self-Identified List (Perry)
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