05000293/FIN-2017007-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Incorporate the Correct Design Limit for the Condensate Storage Tank Water Temperature |
| Description | The team identified a finding of very low safety significance (Green) involving a non- cited violation (NCV) of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion III, Design Control, in that Entergy did not translate the design basis limit for nil ductility transition (NDT) temperature into plant procedures. Specifically, Entergy specified in their procedures and tank heating setpoint calculation the low temperature limit for the two condensate storage tanks (CSTs) to be a non-conservative value, because it was based on the concern of CST freezing rather than the more limiting material service temperature of the downstream safety-related piping. In response, Entergy staff evaluated and confirmed current operability of the CST, and planned to evaluate and revise the affected procedures and tank heating setpoint calculation. This finding was more than minor because if left uncorrected, the performance deficiency would have the potential to lead to a more significant safety concern. Specifically, the minimum CST temperature value stated in procedures, based on an incorrect tank freezing assumption, could potentially result in not providing the full margin of protection against brittle fracture behavior in safety-related piping leading to the reactor vessel. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 2 of IMC 0609, Appendix A, The SDP for Findings At-Power, the team determined the issue screened as having very low safety significance (Green) because it did not represent an actual loss of safety function of the system or train, did not result in the loss of one or more trains of non- technical specification (TS) equipment, and did not screen as potentially risk significant due to seismic, flooding, or severe weather. This finding was not assigned a cross-cutting aspect because the issue did not reflect current licensee performance. |
| Site: | Pilgrim |
|---|---|
| Report | IR 05000293/2017007 Section 1R21 |
| Date counted | Sep 30, 2017 (2017Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21M |
| Inspectors (proximate) | S Pindale J Ayala N Floyd M Orr M Yeminy S Kobylarz M Gray |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
| ' | |
Finding - Pilgrim - IR 05000293/2017007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Pilgrim) @ 2017Q3
Self-Identified List (Pilgrim)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||