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Home > Nuclear Reactors > Operating Reactors > Oversight > Reactor Oversight Process

Sequoyah 2

2Q/2008 Performance Indicators

Licensee's General Comments: none



Link to Notes

Unplanned Scrams per 7000 Critical Hrs 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Unplanned scrams 0 0 2.0 0 0 0 0 0
Critical hours 2208.0 1538.6 2118.8 2184.0 2208.0 2209.0 2183.0 1464.5
                 
Indicator value 0.8 0.9 1.7 1.7 1.7 1.6 0 0


Licensee Comments: none



Link to Notes

Unplanned Power Changes per 7000 Critical Hrs 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Unplanned power changes 0 0 0 0 0 1.0 0 0
Critical hours 2208.0 1538.6 2118.8 2184.0 2208.0 2209.0 2183.0 1464.5
                 
Indicator value 0.8 0.9 0 0 0 0.8 0.8 0.9

Licensee Comments: none





Link to Notes

Unplanned Scrams with Complications 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Scrams with complications   0 0 0 0 0 0 0
                 
                 
Indicator value         0.0 0.0 0.0 0.0

Licensee Comments: none





Link to Notes

Safety System Functional Failures (PWR) 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Safety System Functional Failures 0 0 0 0 0 0 0 0
                 
Indicator value 0 0 0 0 0 0 0 0

Licensee Comments: none





Link to Notes

Mitigating Systems Performance Index, Emergency AC Power System 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
UAI (ΔCDF) -2.60E-07 -2.60E-07 -2.60E-07 -2.50E-07 -2.40E-07 -2.40E-07 -2.40E-07 -2.50E-07
URI (ΔCDF) -1.20E-06 1.30E-06 1.30E-06 1.00E-06 -8.40E-07 -9.20E-07 -8.30E-07 -3.30E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -1.46E-06 1.04E-06 1.04E-06 7.50E-07 -1.08E-06 -1.16E-06 -1.07E-06 -5.80E-07

Licensee Comments:

2Q/08: Risk Cap Invoked. Changed PRA Parameter(s). Revised all quarterly data within the 3 yr reporting window for the following corrections. Planned unavailable hours due to SSPS testing on U1 were removed from the U2 indicator and vice versa. Unavailable hours included while the applicable unit was not critical were subtracted. Also, baseline planned unavailability was updated for these same conditions. These changes made in accordance with Sequoyah PER 135288. BPK7/11/08

1Q/08: Risk Cap Invoked. Changed PRA Parameter(s). An error has been identified in baseline planned unavailability and critical hours. The baseline planned unavailability will increase once corrected adding further margin in the UAI derivation. This correction will be made prior to next quarter's reporting.

4Q/07: Risk Cap Invoked. Changed PRA Parameter(s). The following changes have been made during the reporting quarter. PRA parameters for FVURC, FVUAP, UAP updated to reflect numbers in the basis document. Failure records 1057, 1088, and 1006 have been changed as a result of a re-evaluation.

3Q/07: Risk Cap Invoked. Changed PRA Parameter(s).

2Q/07: Changed PRA Parameter(s).

1Q/07: Changed PRA Parameter(s).

4Q/06: Changed PRA Parameter(s).

3Q/06: Risk Cap Invoked. Changed PRA Parameter(s).

2Q/06: Risk Cap Invoked. Changed PRA Parameter(s).





Link to Notes

Mitigating Systems Performance Index, High Pressure Injection System 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
UAI (ΔCDF) 6.50E-08 9.80E-08 1.00E-07 1.00E-07 1.10E-07 1.10E-07 1.70E-07 1.70E-07
URI (ΔCDF) -1.70E-07 -1.70E-07 -1.70E-07 -1.70E-07 -1.70E-07 -1.70E-07 -1.70E-07 -1.70E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -1.05E-07 -7.20E-08 -7.00E-08 -7.00E-08 -6.00E-08 -6.00E-08 0.00E+00 0.00E+00

Licensee Comments: none





Link to Notes

Mitigating Systems Performance Index, Heat Removal System 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
UAI (ΔCDF) -2.20E-08 -2.20E-08 -2.20E-08 -2.30E-08 -2.30E-08 -2.30E-08 -2.30E-08 -2.20E-08
URI (ΔCDF) -9.90E-08 -9.60E-08 -9.60E-08 -9.60E-08 -9.60E-08 -9.60E-08 -9.50E-08 -8.20E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -1.21E-07 -1.18E-07 -1.18E-07 -1.19E-07 -1.19E-07 -1.19E-07 -1.18E-07 -1.04E-07

Licensee Comments: none





Link to Notes

Mitigating Systems Performance Index, Residual Heat Removal System 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
UAI (ΔCDF) -2.80E-08 -2.80E-08 -2.80E-08 -2.80E-08 -4.70E-08 -4.70E-08 -4.50E-08 8.00E-08
URI (ΔCDF) 5.50E-07 9.50E-08 9.50E-08 9.50E-08 -3.60E-07 -3.60E-07 -3.60E-07 -3.60E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 5.22E-07 6.70E-08 6.70E-08 6.70E-08 -4.07E-07 -4.07E-07 -4.05E-07 -2.80E-07

Licensee Comments: none





Link to Notes

Mitigating Systems Performance Index, Cooling Water Systems 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
UAI (ΔCDF) -2.40E-06 -2.80E-06 -2.70E-06 -2.70E-06 -2.70E-06 -2.70E-06 -2.70E-06 -2.70E-06
URI (ΔCDF) -2.00E-07 -2.00E-07 -2.00E-07 -2.00E-07 -2.00E-07 -2.00E-07 5.90E-07 5.90E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -2.60E-06 -3.00E-06 -2.90E-06 -2.90E-06 -2.90E-06 -2.90E-06 -2.11E-06 -2.11E-06

Licensee Comments:

2Q/08: Changed PRA Parameter(s).





Link to Notes

Reactor Coolant System Activity 7/06 8/06 9/06 10/06 11/06 12/06 1/07 2/07 3/07 4/07 5/07 6/07
Maximum activity 0.000553 0.000686 0.000713 0.000611 0.000917 N/A 0.000354 0.000396 0.000413 0.000401 0.000465 0.000379
Technical specification limit 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
                         
Indicator value 0.2 0.2 0.2 0.2 0.3 N/A 0.1 0.1 0.1 0.1 0.1 0.1
Reactor Coolant System Activity 7/07 8/07 9/07 10/07 11/07 12/07 1/08 2/08 3/08 4/08 5/08 6/08
Maximum activity 0.000382 0.000387 0.000392 0.000414 0.000403 0.000426 0.000418 0.000436 0.000601 0.000598 0.000462 0.000316
Technical specification limit 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
                         
Indicator value 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.1 0.1

Licensee Comments: none





Link to Notes

Reactor Coolant System Leakage 7/06 8/06 9/06 10/06 11/06 12/06 1/07 2/07 3/07 4/07 5/07 6/07
Maximum leakage 0.020 0.020 0.020 0.030 0.030 0.020 0.030 0.020 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 0.2 0.2 0.3 0.3 0.2 0.3 0.2 0.2 0.2 0.3 0.3
Reactor Coolant System Leakage 7/07 8/07 9/07 10/07 11/07 12/07 1/08 2/08 3/08 4/08 5/08 6/08
Maximum leakage 0.020 0.030 0.030 0.020 0.020 0.030 0.020 0.030 0.020 0.030 0.050 0.050
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 0.3 0.2 0.2 0.3 0.2 0.3 0.2 0.3 0.5 0.5

Licensee Comments: none





Link to Notes

Drill/Exercise Performance 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Successful opportunities 38.0 44.0 0 24.0 10.0 30.0 4.0 11.0
Total opportunities 38.0 48.0 0 26.0 10.0 32.0 4.0 12.0
                 
Indicator value 96.1% 94.4% 94.0% 93.8% 93.5% 95.0% 94.9% 94.7%

Licensee Comments: none





Link to Notes

ERO Drill Participation 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Participating Key personnel 82.0 81.0 75.0 82.0 93.0 88.0 83.0 73.0
Total Key personnel 82.0 81.0 76.0 82.0 93.0 88.0 83.0 75.0
                 
Indicator value 100.0% 100.0% 98.7% 100.0% 100.0% 100.0% 100.0% 97.3%

Licensee Comments: none





Link to Notes

Alert & Notification System 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
Successful siren-tests 854 855 750 854 779 964 754 753
Total sirens-tests 861 864 756 864 864 972 756 756
                 
Indicator value 99.4% 99.2% 99.2% 99.0% 96.7% 96.8% 97.0% 97.1%

Licensee Comments: none





Link to Notes

Occupational Exposure Control Effectiveness 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
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





Link to Notes

RETS/ODCM Radiological Effluent 3Q/06 4Q/06 1Q/07 2Q/07 3Q/07 4Q/07 1Q/08 2Q/08
RETS/ODCM occurrences 0 0 0 0 0 0 0 0
                 
Indicator value 0 0 0 0 0 0 0 0

Licensee Comments: none





Physical Protection information not publicly available.


 
 
 
 

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Last Modified: August 4, 2008