05000461/FIN-2012004-04
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Finding | |
|---|---|
| Title | Evaluation of High Pressure Core Spray Test Return Line Pipe Support Failure |
| Description | The inspectors reviewed operability evaluation AR 1380555, HPCS Test Return Line Hanger Damaged, related to the licensees reevaluation of HPCS test return line (1HP18C-12) without HPCS test return line pipe support 1HP06003G, which had failed and pieces were found by operators at the bottom of the suppression pool. The inspectors also reviewed the licensing basis analysis for containment penetration 1PC0033 (also termed 1MC0033). This penetration is a restraint for HPCS test return line (1HP18C-12) and was evaluated for the removal of pipe support 1HP06003G as well. As described in UFSAR Section 3.8.1.5.3, the licensing basis Code of record for containment penetration 1MC0033 is ASME Section III, 1974 Edition, Subsection NE. The ASME Design Specification for piping penetration assemblies (including containment penetrations) is DS-ME-09-CP, Piping Penetration Assemblies Design Specification, Revision 15. ASME Design Specification DS-ME-09-CP does not define a jurisdictional boundary for the piping portion that is considered part of the containment penetration. The jurisdictional boundary of the piping that is part of the containment penetration is defined by ASME Section III, Subsection NE, which states in Section NE-1131, Part C: All piping attached to containment vessel nozzles or to penetration assemblies out to and including the valve or valves required to isolate the system and provide a pressure boundary for the containment function. Such piping shall be designed for the intended service function and the containment function considered either independently or in combination as required by the Design Specification (NA-3250). The inspectors reviewed an original construction calculation (CQD-4536-IPC0033, Penetration Stress Analysis Report for Primary Containment Penetration 1PC0033, Revision 1) that was referenced by the licensee in the operability evaluation. The calculation shows a current overstress condition (i.e., applied stress > allowable stress) for the Level D faulted load condition. The applied stresses due to the level D faulted load condition are due to pipe rupture/jet impingement plus the normal operating system pressure. The design calculation for the containment penetration was identified as nuclear safety-related (Q). UFSAR Section 3.8.1.1.3 describes the safety function of the containment penetration and UFSAR Table 3.8-5 shows the location and size of the containment penetration. In response to the inspectors questions regarding the current overstress condition for the containment penetration the licensee initiated AR 01418577. The licensee also initiated AR 01417729 to address the inspectors question regarding conformance of design requirements with the ASME Code and design specification. Near the end of the inspection period, the licensee provided the inspectors additional information relevant to the containment penetration calculation determination of applied stresses due to Level D load conditions that will require additional review. Therefore, this issue is considered to be an unresolved item (URI 05000461/2012004-4, Evaluation of High Pressure Core Spray Test Return Line Pipe Support Failure) pending additional evaluation by the licensee and completion of inspector review to determine whether a nonconformance exists. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2012004 Section 1R15 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | B Kemker D Lords D Passehl J Beavers J Bozga J Draper M Ring R Ruiz S Mischkea Dahburr Orlikowski B Kemker S Mischke D Lords J Bozga A Shaikh V Myers |
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Finding - Clinton - IR 05000461/2012004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2012Q3
Self-Identified List (Clinton)
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