05000483/FIN-2008008-03
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Finding | |
|---|---|
| Title | Auxiliary Feedwater Turbine Digital Control Panel FC219 |
| Description | The team identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion V, \"Instructions, Procedures, and Drawing for the failure to follow Procedure APA-ZZ-00500, Appendix 1, Revision 6, Operability Determination. The evaluation did not include the additional heat loading on equipment in the turbine driven auxiliary feedwater pump room, caused from an active steam leak from the turbine governor end case joint. The licensee had failed to include the additional steam leak heat load in either of the room temperature calculations M-GF-415 or BO -05, which were used in the operability determination. The heat input into the room, due to the steam leak, may have adversely affected the operation of the turbine digital speed control unit. The licensee has entered this finding into their corrective action program as Callaway Action Request 200808777. The failure to either correct the active steam leak or to account for the leak in their design calculations, is a performance deficiency. Per Inspection Manual Chapter 0612, Appendix E, Section 3, Non-significant Dimensional, Time, Calculation, or Drawing Discrepancies, Example J, this finding is more than minor because the licensee had not resolved the deficiency, resulting in a condition in which there was a reasonable doubt regarding the reliability of the turbine digital speed control unit. Using Inspection Manual Chapter 0609, \"Significance Determination Process,\" Phase 1 screening worksheets, the team determined that the finding was of very low safety significance. Since there was no actual loss of safety function and the new analysis demonstrated that the maximum room temperature, including the additional heat load, would not exceed the design limit of digital turbine speed controls unit, the issue was a design deficiency confirmed not to result in loss of operability per NRC Manual Chapter Part 9900, Technical Guidance, Operability Determination Process for Operability and Functional Assessment. The finding had crosscutting aspects in the area of human performance (decision making) because the licensee used non-conservative assumptions in decision making and failed to either repair the active steam leak, or to account for it in their design calculations. This activity was indicative of current performance as the steam leak still existed and had not been included in the design calculations until October 2008. [H.1 (b)] (Section 1R21.b.3) |
| Site: | Callaway  |
|---|---|
| Report | IR 05000483/2008008 Section 1R21 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | G George P Gage W Sifre |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Callaway - IR 05000483/2008008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2008Q3
Self-Identified List (Callaway)
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