05000387/FIN-2011003-03
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Finding | |
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| Title | Failure to Establish Design Control Measures Associated with lnstallation of a Gland Liner in the HPCI Steam Supply lnboard lsolation Valve |
| Description | A self-revealing, Green NCV of 10 CFR 50, Appendix B, Criterion lll, Design Control, occurred when a brass gland liner was installed in the gland for HV155F002, the High Pressure Coolant lnjection (HPCI)steam supply inboard isolation valve, without appropriately evaluating the material and design of the liner for its potential impact on the valve packing system. Inappropriate design and fabrication of the gland liner resulted in numerous steam leaks since its installation and ultimately led to a significant steam leak that resulted in the inoperability of the Primary Containment lsolation Valve (PCIV), necessitating isolation of HPCI and a plant shutdown to conduct repairs. PPL entered this issue into their CAP as CR1361274. The finding is more than minor because it is associated with the design control attribute of the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, inappropriate design of the gland liner resulted in numerous steam leaks since its installation and ultimately led to a significant steam leak that resulted in the inoperability of the PCIV and isolation of steam to the HPCI system for approximately five days. The finding was determined to be of very low safety significance in accordance with IMC 0609, Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations (lMC 0609,4) using Significant Determination Process (SDP) Phases 1,2 and 3. The Phase 3 evaluation, assuming that HPCI was inoperable for five days, indicated a change in core damage frequency (CDF) in the low E-7 per year range. This issue was determined to not have a cross-cutting aspect as this issue was not reflective of current performance. This was based on the age of the design modification, which was installed in 1996 and reevaluated in 1998. |
| Site: | Susquehanna  |
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| Report | IR 05000387/2011003 Section 4OA2 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Kaufman J Furia A Rosebrook P Finney J Brand P Krohn E Torres J Greives |
| INPO aspect | |
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Finding - Susquehanna - IR 05000387/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2011Q2
Self-Identified List (Susquehanna)
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