05000387/FIN-2014005-04
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | EPA Breaker Under Frequency Setpoint Drift |
| Description | The inspectors identified a Green NCV of 10 CFR 50, Appendix B, Criterion III, Design Control, for PPL not establishing design control measures that provide for verifying or checking the adequacy of design and translating the design basis requirements into allowable values and trip set points. Specifically, PPL did not establish measures to assure the under frequency trip set point on the electrical protection assemblies (EPA) for the reactor protection system (RPS) were correctly translated into design specifications. PPL took immediate corrective actions to perform calibration of all EPA under frequency setpoints and document the condition under CR 2014-28492 and 2014-37665. The PD was determined to be greater than minor because it was associated with the Design Control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the capability of the system that respond to initiating events to prevent undesirable consequences (i.e., core damage). The item is similar to example 3.j in NRC IMC 0612, Appendix E, Examples of Minor Issues. This example states, in part, that it is not minor if the engineering calculation error results in a condition where there is now reasonable doubt on the operability of a system or component. The inspectors evaluated the finding in accordance with NRC IMC 0609, Attachment 4, "Initial Characterization of Findings," Table 2, Cornerstones Affected by Degraded Condition or Programmatic Weakness, and determined it affected the Reactivity Control Systems Degraded subsection of the Mitigating Systems cornerstone. Per IMC 0609, Appendix A, SDP for Findings at Power, Exhibit 2, Mitigating Systems Screening Questions, sub-paragraph C, the inspectors and a Region 1 SRA determined that a detailed risk evaluation was needed to assess the safety significance of this finding. Based upon the detailed risk evaluation, this finding was determined to be Green. The finding was determined to have a cross-cutting aspect in the area of Problem Identification and Resolution, Evaluation, in that PPL did not thoroughly evaluate issues to ensure resolutions address causes commensurate with their safety significance. Specifically, PPL did not thoroughly investigate and evaluate the causes of EPA under frequency set point drift outside the technical specification (TS) allowable values after three EPAs under frequency trip set points drifted below the TS allowable value in 2013 [P.2]. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2014005 Section 4OA3 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | D Lawyer F Arner F Bower H Gray J Brand J Furia J Grieves J Heinly J Nicholson M Patel O Masnyk-Bailey S Pindale T Daun C Graves |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
| ' | |
Finding - Susquehanna - IR 05000387/2014005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Susquehanna) @ 2014Q4
Self-Identified List (Susquehanna)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||