Watts Bar 1
1Q/2012 Performance Indicators
Licensee's General Comments: none
| Unplanned Scrams per 7000 Critical Hrs | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Unplanned scrams | 1.0 | 0 | 1.0 | 0 | 1.0 | 0 | 0 | 0 |
| Critical hours | 2119.7 | 2208.0 | 2126.2 | 2159.0 | 1054.1 | 2208.0 | 2058.5 | 2183.0 |
| Indicator value | 0.9 | 0.8 | 1.6 | 1.6 | 1.9 | 1.9 | 0.9 | 0.9 |
Licensee Comments:
2Q/11: Automatic reactor trip May 29, 2011 due to turbine trip from Automatic Voltage Regulator.
| Unplanned Power Changes per 7000 Critical Hrs | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Unplanned power changes | 0 | 1.0 | 0 | 0 | 1.0 | 1.0 | 0 | 0 |
| Critical hours | 2119.7 | 2208.0 | 2126.2 | 2159.0 | 1054.1 | 2208.0 | 2058.5 | 2183.0 |
| Indicator value | 0 | 0.8 | 0.8 | 0.8 | 1.9 | 1.9 | 1.9 | 1.9 |
Licensee Comments:
2Q/11: Manual turbine trip May 23, 2011 to repair EHC weld failure. Reactor remained critical.
3Q/10: 8/15/10 Forced outage manual turbine trip - EHC leak on LP B west side reheat stop valve emergency dump line.
| Unplanned Scrams with Complications | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Scrams with complications | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Indicator value | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Licensee Comments: none
| Safety System Functional Failures (PWR) | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Safety System Functional Failures | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Indicator value | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Licensee Comments: none
| Mitigating Systems Performance Index, Emergency AC Power System | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| UAI (ΔCDF) | 3.25E-08 | 3.31E-08 | 3.12E-08 | 4.69E-07 | 5.10E-07 | 8.30E-07 | 9.19E-07 | 9.10E-07 |
| URI (ΔCDF) | -9.54E-08 | -9.54E-08 | -9.54E-08 | -2.58E-06 | -2.58E-06 | -2.58E-06 | -2.58E-06 | -3.06E-06 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -6.30E-08 | -6.20E-08 | -6.40E-08 | -2.10E-06 | -2.10E-06 | -1.70E-06 | -1.70E-06 | -2.10E-06 |
Licensee Comments:
4Q/11: Risk Cap Invoked.
3Q/11: Risk Cap Invoked.
2Q/11: Risk Cap Invoked.
1Q/11: Risk Cap Invoked. During the 4Q2010 Watts Bar issued a CAFTA PRA model. The revision changed the PRA values for the MSPI Core Damage Frequency and the unavailability and unreliability values. This change is effective 1Q2011. The details are available in the Watts Bar Basis Document.
| Mitigating Systems Performance Index, High Pressure Injection System | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| UAI (ΔCDF) | -1.41E-08 | -1.52E-08 | -1.54E-08 | -2.90E-08 | -5.79E-08 | -5.94E-08 | -5.92E-08 | -5.94E-08 |
| URI (ΔCDF) | -1.89E-07 | -1.89E-07 | -1.89E-07 | 4.34E-08 | -1.36E-08 | -1.37E-08 | -1.39E-08 | -1.40E-08 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -2.00E-07 | -2.00E-07 | -2.00E-07 | 1.40E-08 | -7.10E-08 | -7.30E-08 | -7.30E-08 | -7.30E-08 |
Licensee Comments:
1Q/11: During Fourth quarter of 2010 Watts Bar issued a CAFTA PRA model. The revision changed the PRA values for the MSPI Core Damage Frequency, and the unavailability and unreliability values. This change is effective first quarter 2011. The details are available in Watts Bar Basis Document.
4Q/10: Changed PRA Parameter(s). During PRA update for 1Q2011 data that was initially entered caused change in this quarter which was not intended. The data was corrected (returned to previous) and record was reapproved. No change in MSPI resulted for this quarter.
3Q/10: Changed PRA Parameter(s). During PRA update for 1Q2011 data that was initially entered caused change in this quarter which was not intended. The data was corrected (retunred to previous) and record was reapproved. No change in MSPI resulted for this quarter.
2Q/10: Changed PRA Parameter(s). During PRA update for 1QR2011 data that was initially entered caused change in this quarter which was not intended. The data was corrected (returned to previous) and record was reapproved. No change in MSPI for this quarter.
| Mitigating Systems Performance Index, Heat Removal System | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| UAI (ΔCDF) | 3.13E-07 | 3.14E-07 | 3.71E-07 | 7.39E-07 | 6.84E-07 | 5.29E-07 | 4.71E-07 | 4.68E-07 |
| URI (ΔCDF) | 2.55E-07 | 2.49E-07 | 2.49E-07 | 1.22E-07 | 1.22E-07 | -3.78E-07 | -3.78E-07 | -3.78E-07 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | 5.70E-07 | 5.60E-07 | 6.20E-07 | 8.60E-07 | 8.10E-07 | 1.50E-07 | 9.30E-08 | 9.00E-08 |
Licensee Comments:
2Q/11: Risk Cap Invoked.
1Q/11: Risk Cap Invoked. PRA recalculated their models and made AFW much more risk significant. Hours lost after remodeling on MDAFW Trains A and C and TDAFW Train C caused the drop close to White.
| Mitigating Systems Performance Index, Residual Heat Removal System | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| UAI (ΔCDF) | 1.95E-08 | 2.83E-08 | 3.71E-08 | 2.27E-08 | 2.84E-08 | 3.91E-08 | 4.06E-08 | 4.17E-08 |
| URI (ΔCDF) | -2.54E-07 | -2.54E-07 | -2.54E-07 | -4.08E-08 | -4.12E-08 | -4.16E-08 | -4.20E-08 | -4.24E-08 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -2.30E-07 | -2.30E-07 | -2.20E-07 | -1.80E-08 | -1.30E-08 | -2.50E-09 | -1.40E-09 | -7.80E-10 |
Licensee Comments:
1Q/11: During Fourth quarter of 2010 Watts Bar issued a CAFTA PRA model. The revision changed the PRA values for the MSPI Core Damage Frequency, and the unavailability and unreliability values. This change is effective first quarter 2011. The details are available in Watts Bar Basis Document.
| Mitigating Systems Performance Index, Cooling Water Systems | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| UAI (ΔCDF) | 4.92E-08 | 4.80E-08 | 7.28E-08 | 4.97E-08 | 5.47E-08 | 5.02E-08 | 4.08E-08 | 3.87E-08 |
| URI (ΔCDF) | 1.23E-08 | 1.23E-08 | 2.49E-08 | 1.29E-08 | -4.16E-08 | -4.85E-08 | -4.85E-08 | -4.85E-08 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | 6.20E-08 | 6.00E-08 | 9.80E-08 | 6.30E-08 | 1.30E-08 | 1.70E-09 | -7.70E-09 | -9.80E-09 |
Licensee Comments:
1Q/11: During Fourth quarter of 2010 Watts Bar issued a CAFTA PRA model. The revision changed the PRA values for the MSPI Core Damage Frequency, and the unavailability and unreliability values. This change is effective first quarter 2011. The details are available in Watts Bar Basis Document.
| Reactor Coolant System Activity | 4/10 | 5/10 | 6/10 | 7/10 | 8/10 | 9/10 | 10/10 | 11/10 | 12/10 | 1/11 | 2/11 | 3/11 |
| Maximum activity | 0.001016 | 0.001053 | 0.001160 | 0.001062 | 0.001066 | 0.001108 | 0.001161 | 0.001191 | 0.001186 | 0.001240 | 0.001306 | 0.001271 |
| Technical specification limit | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Indicator value | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 |
| Reactor Coolant System Activity | 4/11 | 5/11 | 6/11 | 7/11 | 8/11 | 9/11 | 10/11 | 11/11 | 12/11 | 1/12 | 2/12 | 3/12 |
| Maximum activity | 0.001073 | N/A | 0.000326 | 0.000338 | 0.000329 | 0.000336 | 0.000358 | 0.000360 | 0.000388 | 0.000401 | 0.000405 | 0.000417 |
| Technical specification limit | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Indicator value | 0.4 | N/A | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 |
Licensee Comments: none
| Reactor Coolant System Leakage | 4/10 | 5/10 | 6/10 | 7/10 | 8/10 | 9/10 | 10/10 | 11/10 | 12/10 | 1/11 | 2/11 | 3/11 |
| Maximum leakage | 0.020 | 0.030 | 0.020 | 0.010 | 0.010 | 0.010 | 0.010 | 0.030 | 0.020 | 0.020 | 0.030 | 0.030 |
| Technical specification limit | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 |
| Indicator value | 0.2 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.2 | 0.2 | 0.3 | 0.3 |
| Reactor Coolant System Leakage | 4/11 | 5/11 | 6/11 | 7/11 | 8/11 | 9/11 | 10/11 | 11/11 | 12/11 | 1/12 | 2/12 | 3/12 |
| Maximum leakage | 0 | 0.020 | 0.050 | 0.010 | 0.010 | 0.020 | 0.020 | 0.020 | 0.010 | 0.010 | 0.010 | 0.020 |
| Technical specification limit | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 |
| Indicator value | 0 | 0.2 | 0.5 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 |
Licensee Comments: none
| Drill/Exercise Performance | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Successful opportunities | 29.0 | 62.0 | 64.0 | 32.0 | 49.0 | 60.0 | 64.0 | 35.0 |
| Total opportunities | 34.0 | 62.0 | 65.0 | 32.0 | 50.0 | 60.0 | 67.0 | 35.0 |
| Indicator value | 96.7% | 97.0% | 97.2% | 97.5% | 97.3% | 97.4% | 97.0% | 97.5% |
Licensee Comments: none
| ERO Drill Participation | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Participating Key personnel | 72.0 | 79.0 | 78.0 | 78.0 | 74.0 | 74.0 | 70.0 | 69.0 |
| Total Key personnel | 72.0 | 79.0 | 78.0 | 78.0 | 74.0 | 74.0 | 70.0 | 69.0 |
| Indicator value | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
Licensee Comments: none
| Alert & Notification System | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| Successful siren-tests | 888 | 690 | 887 | 692 | 887 | 788 | 790 | 788 |
| Total sirens-tests | 891 | 693 | 891 | 693 | 891 | 792 | 792 | 792 |
| Indicator value | 99.6% | 99.6% | 99.6% | 99.7% | 99.6% | 99.6% | 99.7% | 99.6% |
Licensee Comments: none
| Occupational Exposure Control Effectiveness | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| High radiation area occurrences | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Very high radiation area occurrences | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Unintended exposure occurrences | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Indicator value | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Licensee Comments: none
| RETS/ODCM Radiological Effluent | 2Q/10 | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 |
| RETS/ODCM occurrences | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Indicator value | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Licensee Comments: none
Security information not publicly available.
Action Matrix Summary |
Inspection Findings Summary |
PI Summary |
Reactor Oversight Process
Last Modified: April 25, 2012