Prairie Island 2
2Q/2012 Performance Indicators
Licensee's General Comments: none
| Unplanned Scrams per 7000 Critical Hrs | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Unplanned scrams | 0 | 0 | 0 | 1.0 | 0 | 0 | 1.0 | 0 |
| Critical hours | 2208.0 | 2209.0 | 2159.0 | 2163.4 | 2208.0 | 1849.9 | 1247.7 | 814.0 |
| Indicator value | 1.8 | 1.8 | 1.8 | 0.8 | 0.8 | 0.8 | 1.9 | 1.1 |
Licensee Comments: none
| Unplanned Power Changes per 7000 Critical Hrs | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Unplanned power changes | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Critical hours | 2208.0 | 2209.0 | 2159.0 | 2163.4 | 2208.0 | 1849.9 | 1247.7 | 814.0 |
| Indicator value | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Licensee Comments: none
| Unplanned Scrams with Complications | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/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) | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Safety System Functional Failures | 2 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
| Indicator value | 3 | 2 | 3 | 4 | 3 | 3 | 2 | 1 |
Licensee Comments:
3Q/11: LER # 50-306/2011-003-00. Report date 8/23/2011 - Unit 2 Offsite Power Sources Declared Inoperable as a Consequence of the Loss of the 2RY Transformer Bus Duct (L-PI-11-066).
2Q/11: LER 50306/2011-001-00 Unit 2 Shield Building Inoperable
1Q/11: LER 50-282/2010-004-00 - 1/28/2011 - Battery Charger Inoperability due to Potential Undervoltage Conditions
3Q/10: 7/16/2010 - LER 50-306/2010-003-00, Unit 2 Fuel Oil Transfer Pumps are Vulnerable To A Potential Common Mode Failure, 8/9/2010 - LER 50-282/2010-003-00, Postulated Flooding of Battery Rooms Due To Inadequate Battery Room Door Threshold Seals
| Mitigating Systems Performance Index, Emergency AC Power System | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| UAI (ΔCDF) | 1.25E-07 | 5.28E-08 | 9.44E-08 | 9.46E-08 | 1.17E-07 | 7.89E-07 | 4.00E-07 | 3.26E-07 |
| URI (ΔCDF) | -1.08E-07 | -1.08E-07 | -1.08E-07 | -1.08E-07 | 3.92E-07 | -1.50E-07 | -1.37E-07 | -1.24E-07 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | 1.80E-08 | -5.50E-08 | -1.30E-08 | -1.30E-08 | 5.10E-07 | 6.40E-07 | 2.60E-07 | 2.00E-07 |
Licensee Comments:
2Q/12: Risk Cap Invoked.
1Q/12: Risk Cap Invoked.
4Q/11: Risk Cap Invoked. Changed PRA Parameter(s).
3Q/11: Risk Cap Invoked.
| Mitigating Systems Performance Index, High Pressure Injection System | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| UAI (ΔCDF) | 6.24E-09 | 1.11E-08 | 1.00E-08 | 1.00E-08 | 9.53E-09 | 2.34E-08 | 2.56E-08 | 2.55E-08 |
| URI (ΔCDF) | -1.69E-08 | -1.69E-08 | -1.69E-08 | -1.69E-08 | -1.69E-08 | -3.13E-08 | -3.14E-08 | -3.17E-08 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -1.10E-08 | -5.90E-09 | -6.90E-09 | -6.90E-09 | -7.40E-09 | -7.90E-09 | -5.80E-09 | -6.20E-09 |
Licensee Comments:
4Q/11: Changed PRA Parameter(s).
| Mitigating Systems Performance Index, Heat Removal System | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| UAI (ΔCDF) | 7.87E-09 | 8.61E-09 | 1.41E-08 | 1.42E-08 | 1.29E-08 | 1.57E-08 | 2.01E-08 | 1.17E-09 |
| URI (ΔCDF) | -1.32E-07 | -1.32E-07 | -1.32E-07 | -1.34E-07 | -1.33E-07 | -1.81E-07 | -1.86E-07 | -1.88E-07 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -1.20E-07 | -1.20E-07 | -1.20E-07 | -1.20E-07 | -1.20E-07 | -1.70E-07 | -1.70E-07 | -1.90E-07 |
Licensee Comments:
4Q/11: Changed PRA Parameter(s).
| Mitigating Systems Performance Index, Residual Heat Removal System | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| UAI (ΔCDF) | 8.87E-09 | 8.87E-09 | 8.90E-09 | 8.93E-09 | 8.60E-09 | 1.49E-08 | -2.94E-08 | -2.94E-08 |
| URI (ΔCDF) | -1.31E-07 | -1.31E-07 | -1.31E-07 | -1.31E-07 | -1.12E-07 | -1.21E-07 | -1.38E-07 | 3.06E-07 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | -1.20E-07 | -1.20E-07 | -1.20E-07 | -1.20E-07 | -1.00E-07 | -1.10E-07 | -1.70E-07 | 2.80E-07 |
Licensee Comments:
4Q/11: Changed PRA Parameter(s).
| Mitigating Systems Performance Index, Cooling Water Systems | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| UAI (ΔCDF) | 1.42E-06 | 9.98E-07 | 9.78E-07 | 1.03E-06 | 9.39E-07 | 3.45E-07 | 3.51E-07 | 2.86E-07 |
| URI (ΔCDF) | -4.54E-07 | -4.50E-07 | -4.47E-07 | -4.47E-07 | -4.41E-07 | -2.59E-07 | -2.61E-07 | -3.29E-07 |
| PLE | NO | NO | NO | NO | NO | NO | NO | NO |
| Indicator value | 9.60E-07 | 5.50E-07 | 5.30E-07 | 5.80E-07 | 5.00E-07 | 8.60E-08 | 9.00E-08 | -4.20E-08 |
Licensee Comments:
4Q/11: Changed PRA Parameter(s).
| Reactor Coolant System Activity | 7/10 | 8/10 | 9/10 | 10/10 | 11/10 | 12/10 | 1/11 | 2/11 | 3/11 | 4/11 | 5/11 | 6/11 |
| Maximum activity | 0.000119 | 0.000108 | 0.000150 | 0.000140 | 0.000147 | 0.000161 | 0.000152 | 0.000160 | 0.000162 | 0.000169 | 0.000173 | 0.000177 |
| Technical specification limit | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Indicator value | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Reactor Coolant System Activity | 7/11 | 8/11 | 9/11 | 10/11 | 11/11 | 12/11 | 1/12 | 2/12 | 3/12 | 4/12 | 5/12 | 6/12 |
| Maximum activity | 0.000211 | 0.000181 | 0.000182 | 0.000195 | 0.000201 | 0.000200 | 0.000213 | 0.000212 | N/A | N/A | N/A | 0.000106 |
| Technical specification limit | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Indicator value | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | N/A | N/A | N/A | 0 |
Licensee Comments: none
| Reactor Coolant System Leakage | 7/10 | 8/10 | 9/10 | 10/10 | 11/10 | 12/10 | 1/11 | 2/11 | 3/11 | 4/11 | 5/11 | 6/11 |
| Maximum leakage | 0.101 | 0.076 | 0.100 | 0.273 | 0.391 | 0.268 | 0.242 | 0.164 | 0.150 | 0.267 | 0.204 | 0.169 |
| 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 | 1.0 | 0.8 | 1.0 | 2.7 | 3.9 | 2.7 | 2.4 | 1.6 | 1.5 | 2.7 | 2.0 | 1.7 |
| Reactor Coolant System Leakage | 7/11 | 8/11 | 9/11 | 10/11 | 11/11 | 12/11 | 1/12 | 2/12 | 3/12 | 4/12 | 5/12 | 6/12 |
| Maximum leakage | 0.125 | 0.339 | 0.355 | 0.109 | 0.133 | 0.102 | 0.144 | 0.156 | 0 | 0 | 0.208 | 0.169 |
| 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 | 1.3 | 3.4 | 3.6 | 1.1 | 1.3 | 1.0 | 1.4 | 1.6 | 0 | 0 | 2.1 | 1.7 |
Licensee Comments: none
| Drill/Exercise Performance | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Successful opportunities | 60.0 | 22.0 | 40.0 | 6.0 | 29.0 | 27.0 | 26.0 | 14.0 |
| Total opportunities | 60.0 | 23.0 | 40.0 | 6.0 | 32.0 | 27.0 | 28.0 | 14.0 |
| Indicator value | 97.3% | 97.6% | 97.1% | 97.1% | 96.2% | 96.3% | 96.8% | 97.4% |
Licensee Comments:
1Q/12: Revised February and March 2012 Drill and Exercise Performance based on previously unaccounted for opportunities. No change to performance indicator color.Revised February and March 2012 Drill and Exercise Performance based on previously unaccounted for opportunities. No change to performance indicator color.
4Q/10: Error was discovered in 4th quarter 2010 data. DEP credit was taken for unanticipated notification.
| ERO Drill Participation | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Participating Key personnel | 150.0 | 153.0 | 141.0 | 141.0 | 143.0 | 145.0 | 156.0 | 155.0 |
| Total Key personnel | 151.0 | 154.0 | 142.0 | 141.0 | 143.0 | 145.0 | 156.0 | 155.0 |
| Indicator value | 99.3% | 99.4% | 99.3% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
Licensee Comments: none
| Alert & Notification System | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/12 |
| Successful siren-tests | 1516 | 1517 | 1519 | 1512 | 1463 | 1514 | 1520 | 1516 |
| Total sirens-tests | 1521 | 1521 | 1521 | 1521 | 1521 | 1521 | 1521 | 1521 |
| Indicator value | 99.6% | 99.6% | 99.7% | 99.7% | 98.8% | 98.8% | 98.8% | 98.8% |
Licensee Comments: none
| Occupational Exposure Control Effectiveness | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/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 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Licensee Comments: none
| RETS/ODCM Radiological Effluent | 3Q/10 | 4Q/10 | 1Q/11 | 2Q/11 | 3Q/11 | 4Q/11 | 1Q/12 | 2Q/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
Although the Security Cornerstone is included in the Reactor Oversight Process assessment program, the Commission has decided that specific information related to findings and performance indicators pertaining to the Security Cornerstone will not be publicly available to ensure that security information is not provided to a possible adversary. Other than the fact that a finding or performance indicator is Green or Greater-Than-Green, security related information will not be displayed on the public web page.
Action Matrix Summary |
Inspection Findings Summary |
PI Summary |
Reactor Oversight Process
Last Modified: July 24, 2012