05000237/FIN-2010002-07
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | The Code of Federal Regulations, Title 10, Part 50, Appendix B, Criterion III, Design Control, states, in part, Measures shall be established to assure that ... the design basis, as defined in 50.2 and as specified in the license application, for those structures, systems, and components to which this appendix applies are correctly translated into specifications, drawings, procedures, and instructions. These measures shall include provisions to assure that appropriate quality standards are specified and included in design documents and that deviations from such standards are controlled. Electrical Standard IEEE-279-1968, Proposed IEEE Criteria for Nuclear Power Plant Protection Systems, required, in part, that the reactor protection system (RPS) was designed, such that, the system was not susceptible to a single point vulnerability. On October 30,2009, the licensee identified that the RPS pressure switches PS 2-0504-A, B, C, and D all shared a common sensing line with a single isolation valve, which created a single point vulnerability for the turbine stop valve closure (RPS function 8) and turbine control valve fast closure - trip oil pressure low (RPS function 9) reactor scram functions. This condition had existed since original construction. The inspectors reviewed the licensees corrective actions. The inspectors had no issues with the licensees corrective actions and determined that they were completed for Unit 2 and had an acceptable time table for completion of Unit 3. This incident was identified in the licensees corrective action program as Issue Reports 986676 and 996586, and documented in LER 237/2009-007-00, Reactor Protection System Nonconformance to a Design Standard. This violation was determined to be of very low safety significance because the safety function of the reactor protection system was supported by existing procedure guidance in the event the sensing line failed or was inadvertently isolated; therefore, this condition resulted in RPS functions 8 and 9 being operable, but nonconforming |
| Site: | Dresden  |
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| Report | IR 05000237/2010002 Section 4OA7 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Phillips D Melendez-Colon E Coffman J Draper M Ring R Krsek R Russell W Slawinski |
| INPO aspect | |
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Finding - Dresden - IR 05000237/2010002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2010Q1
Self-Identified List (Dresden)
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