05000387/FIN-2016001-04
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Finding | |
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Title | Licensee-Identified Violation |
Description | 10 CFR Part 50 Appendix B, Criterion XVI Corrective Action, requires, in part, that measures be established to assure conditions adverse to quality are promptly identified and corrected. Susquehanna Unit 1 TS 3.3.8.2 requires operability of two RPS electrical power monitoring assemblies for each inservice RPS alternative power supply. Contrary to this, a defective electrical power monitoring assembly was installed into the RPS alternative power supply in December 2014. Susquehanna identified that in September 2000, an electrical power monitoring assembly had failed to perform an UF trip. An evaluation of the failure was conducted and Susquehanna incorrectly concluded in 2001 that the electrical power monitoring assembly did not contribute to the failure and returned the electrical power monitoring assembly back to a spare parts status. In December 2014 the subject electrical power monitoring assembly was installed into the alternative RPS power supply and in September 2015 again failed to perform an UF trip. As reported in LER 387/2015-008 this resulted in an inoperable electrical power monitoring assembly in the inservice alternative RPS power supply for greater than the allowed outage time. This violation has been entered into Susquehannas CAP as CR-2015-25881. The inspectors evaluated this finding using IMC 0609.04, Initial Characterization of Findings, and IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power. Because it was associated with the RPS, the inspectors screened the violation against the questions in IMC 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions, Part C, Reactivity Control Systems. The inspectors determined the finding was of very low safety significance (Green) because the second RPS electrical power monitoring assembly remained operable which would have generated an UF trip for the RPS alternative power supply if required, did not involve unintentional reactivity addition, and did not involve a mismanagement of reactivity by operators. |
Site: | Susquehanna |
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Report | IR 05000387/2016001 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 XVI Technical Specification |
INPO aspect | |
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Finding - Susquehanna - IR 05000387/2016001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2016Q1
Self-Identified List (Susquehanna)
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