05000388/FIN-2016001-05
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | 10 CFR Part 50 Appendix B, Criterion III Design Control, requires, in part, that measures be established for the selection and review for suitability of applicable equipment that is essential to the safety-related functions of systems. Susquehanna Unit 2 TS 3.3.5.1 requires operability of four reactor steam dome pressure low channels to provide the injection permissive for CS (Function 1d) and LPCI system (Function 2d). Contrary to this requirement, Susquehanna did not consider the effects of mechanical hysteresis on the function of reactor steam dome pressure switches when operated above their normal operating range. These reactor steam dome pressure switches remain in an overpressure condition during normal operations and as reported in LER 388/2015-001 resulted in pressure switches drifting out of TS allowable values for emergency core cooling system (ECCS) injection valve permissive interlocks for greater than the TS allowed outage time. This violation has been entered into Susquehannas CAP as CR-2015-06243. In consultation with regional Senior Reactor Analysts, the inspectors determined the finding was of very low safety significance (Green) because the ability to open low pressure ECCS injection valves manually remained available and engineering analysis for the as-found condition of the switches determined that the resultant delay in automatic response would have a negligible increase in peak central temperature during a design basis accident. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000388/2016001 Section 4OA7 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | D Schroeder J Grieves N Floyd P Meier T Daun |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
| INPO aspect | |
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Finding - Susquehanna - IR 05000388/2016001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2016Q1
Self-Identified List (Susquehanna)
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