United States Nuclear Regulatory Commission - Protecting People and the Environment

Sequoyah 2 – Quarterly Performance Indicators

2Q/2017 Performance Indicators

The solid trend line represents the current reporting period.

Licensee's General Comments: none

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Unplanned Scrams per 7000 Critical Hrs 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Unplanned scrams 0 0 0 0 0 0 0 0
Critical hours 2208.0 1498.6 2183.0 2150.3 2208.0 2209.0 2159.0 1331.7
                 
Indicator value 0.8 0.9 0 0 0 0 0 0

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Unplanned Power Changes per 7000 Critical Hrs 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Unplanned power changes 0 0 0 1.0 0 0 0 0
Critical hours 2208.0 1498.6 2183.0 2150.3 2208.0 2209.0 2159.0 1331.7
                 
Indicator value 0.8 0.9 0 0.9 0.9 0.8 0.8 0

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Unplanned Scrams with Complications 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
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

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Licensee Comments: none




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Safety System Functional Failures (PWR) 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Safety System Functional Failures 0 0 1 0 0 2 0 1
                 
Indicator value 0 0 1 1 1 3 2 3

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Licensee Comments:
2Q/17: LER 328/2017-001, Breached Door Renders Both Trains of the Auxiliary Building Gas Treatment System Inoperable
4Q/16: LER 328/2016-007 Unanalyzed Condition Due to Emergency Gas Treatment System not Meeting Single Failure Criteria. LER 328/2016-008 Closed Fire Damper Renders Both Trains of the Control Room Emergency Ventilation System Inoperable
1Q/16: Licensee Event Report 328/2015-002 - Unanalyzed Condition due to Inoperable Containment Recirculation Drains.




Link to Notes

Mitigating Systems Performance Index, Emergency AC Power System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
UAI (ΔCDF) 3.69E-08 2.95E-08 1.46E-08 1.56E-09 -5.45E-09 -5.68E-09 1.21E-08 1.03E-08
URI (ΔCDF) -5.36E-08 -5.49E-08 -1.46E-07 -1.49E-07 -1.46E-07 -1.54E-07 -1.54E-07 -1.56E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -1.70E-08 -2.50E-08 -1.30E-07 -1.50E-07 -1.50E-07 -1.60E-07 -1.40E-07 -1.50E-07

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Licensee Comments: none




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Mitigating Systems Performance Index, High Pressure Injection System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
UAI (ΔCDF) 3.39E-08 3.14E-08 2.78E-08 2.34E-08 1.78E-08 1.95E-08 1.75E-08 1.71E-08
URI (ΔCDF) -2.25E-09 -2.25E-09 -2.25E-09 -2.25E-09 -2.25E-09 -2.25E-09 -2.25E-09 -2.25E-09
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 3.20E-08 2.90E-08 2.60E-08 2.10E-08 1.60E-08 1.70E-08 1.50E-08 1.50E-08

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Licensee Comments: none




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Mitigating Systems Performance Index, Heat Removal System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
UAI (ΔCDF) 1.59E-08 -2.59E-09 -3.07E-09 -1.69E-08 -1.86E-08 -2.09E-08 -2.31E-08 -2.03E-08
URI (ΔCDF) -1.64E-07 2.67E-08 3.14E-08 2.80E-08 2.80E-08 2.80E-08 2.80E-08 2.47E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -1.50E-07 2.40E-08 2.80E-08 1.10E-08 9.30E-09 7.10E-09 4.80E-09 4.40E-09

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Licensee Comments: none




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Mitigating Systems Performance Index, Residual Heat Removal System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
UAI (ΔCDF) 1.32E-08 1.04E-08 8.21E-09 9.88E-09 1.03E-08 1.02E-08 8.61E-09 9.81E-09
URI (ΔCDF) 5.52E-08 5.52E-08 5.52E-08 5.52E-08 5.52E-08 5.52E-08 -2.57E-08 -2.57E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 6.80E-08 6.60E-08 6.30E-08 6.50E-08 6.50E-08 6.50E-08 -1.70E-08 -1.60E-08

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Licensee Comments: none




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Mitigating Systems Performance Index, Cooling Water Systems 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
UAI (ΔCDF) 4.10E-08 3.82E-08 1.73E-08 1.57E-08 2.33E-08 2.57E-08 3.67E-08 3.91E-08
URI (ΔCDF) -1.30E-08 -1.30E-08 -1.30E-08 -1.30E-08 -1.30E-08 -1.30E-08 -1.32E-08 -1.34E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 2.80E-08 2.50E-08 4.30E-09 2.70E-09 1.00E-08 1.30E-08 2.30E-08 2.60E-08

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Licensee Comments: none




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Reactor Coolant System Activity 7/15 8/15 9/15 10/15 11/15 12/15 1/16 2/16 3/16 4/16 5/16 6/16
Maximum activity 0.000094 0.000101 0.000090 0.000138 0.000068 0.000055 0.000050 0.000095 0.000050 0.000053 0.000055 0.000067
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 0 0 0 0 0 0 0 0 0 0 0
Reactor Coolant System Activity 7/16 8/16 9/16 10/16 11/16 12/16 1/17 2/17 3/17 4/17 5/17 6/17
Maximum activity 0.000129 0.000066 0.000071 0.000077 0.000078 0.000076 0.000071 0.000074 0.000078 0.000086 N/A 0.000055
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 0 0 0 0 0 0 0 0 0 N/A 0

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Reactor Coolant System Leakage 7/15 8/15 9/15 10/15 11/15 12/15 1/16 2/16 3/16 4/16 5/16 6/16
Maximum leakage 0.030 0.020 0.020 0.020 0.020 0.040 0.020 0.020 0.010 0.020 0.020 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 0.3 0.2 0.2 0.2 0.2 0.4 0.2 0.2 0.1 0.2 0.2 0.2
Reactor Coolant System Leakage 7/16 8/16 9/16 10/16 11/16 12/16 1/17 2/17 3/17 4/17 5/17 6/17
Maximum leakage 0.010 0.020 0.020 0.020 0.040 0.030 0.020 0.020 0.030 0.040 0 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 0.1 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.3 0.4 0 0.3

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Licensee Comments: none




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Drill/Exercise Performance 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Successful opportunities 58.0 63.0 84.0 74.0 107.0 20.0 28.0 12.0
Total opportunities 58.0 64.0 84.0 75.0 108.0 21.0 28.0 12.0
                 
Indicator value 99.4% 99.2% 99.5% 99.4% 99.3% 99.2% 99.1% 99.1%

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Licensee Comments: none




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ERO Drill Participation 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Participating Key personnel 95.0 99.0 96.0 97.0 99.0 97.0 82.0 84.0
Total Key personnel 96.0 99.0 96.0 97.0 99.0 97.0 82.0 84.0
                 
Indicator value 99.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

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Licensee Comments: none




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Alert & Notification System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Successful siren-tests 1012 791 1017 780 903 904 1016 904
Total sirens-tests 1017 791 1017 791 904 904 1017 904
                 
Indicator value 99.8% 99.9% 99.9% 99.6% 99.7% 99.7% 99.6% 99.9%

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Occupational Exposure Control Effectiveness 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
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

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RETS/ODCM Radiological Effluent 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
RETS/ODCM occurrences 0 0 0 0 0 0 0 0
                 
Indicator value 0 0 0 0 0 0 0 0

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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.





 
 
 
 

Current data as of: July 26, 2017

Page Last Reviewed/Updated Wednesday, June 07, 2017