United States Nuclear Regulatory Commission - Protecting People and the Environment

Byron 1 – Quarterly Performance Indicators

2Q/2017 Performance Indicators

The solid trend line represents the current reporting period.

Licensee's General Comments: Byron Station 2Q2017 Unit 1

On this page:

Link to Notes

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 1800.0 2184.2 2183.0 2184.0 2208.0 2209.0 1509.1 2184.0
                 
Indicator value 0.9 0.9 0 0 0 0 0 0

To top of page

Licensee Comments: none


Link to Notes

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 1.0 0 0 0 1.0 0
Critical hours 1800.0 2184.2 2183.0 2184.0 2208.0 2209.0 1509.1 2184.0
                 
Indicator value 0.9 0 0.8 0.8 0.8 0.8 0.9 0.9

To top of page

Licensee Comments: none




Link to Notes

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

To top of page

Licensee Comments: none




Link to Notes

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 1 0 1 1 0 0 0
                 
Indicator value 0 1 1 2 3 2 2 1

To top of page

Licensee Comments:
3Q/16: LER 2016-001-00, May 2016 AF Diesel Intake Design Deficiency Due to High Energy Line Break (HELB) Concerns. LER 2016-002-00 was issued 7/21/16, for Inadequate protection from Tornado Missiles Due to Non-conforming Design Conditions. 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
2Q/16: LER 2015-006-00 was issued on 11/30/15 for Mode 3 entered with Turbine Trip safety Function disabled due to Safety Related Relay Leads lifted. May 2016 - LER 2016-001-00 IR2636112 ICES#322087
1Q/16: LER 2015-006-00 was issued on 11/30/15 for Mode 3 entered with Turbine Trip safety Function disabled due to Safety Related Relay Leads lifted.
4Q/15: LER 2015-006-00 was issued on 11/30/15 for Mode 3 entered with Turbine Trip safety Function disabled due to Safety Related Relay Leads lifted.




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) 6.20E-08 5.03E-08 1.15E-08 8.38E-09 7.31E-09 6.00E-10 2.38E-08 5.72E-08
URI (ΔCDF) -2.71E-07 -1.84E-07 -1.84E-07 -1.84E-07 -1.84E-07 -1.84E-07 -1.82E-07 -2.56E-07
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -2.10E-07 -1.30E-07 -1.70E-07 -1.80E-07 -1.80E-07 -1.80E-07 -1.60E-07 -2.00E-07

To top of page

Licensee Comments:
2Q/17: Changed PRA Parameter(s). Changed PRA Parameter(s).
3Q/16: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: Changed PRA Parameter(s).




Link to Notes

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) -1.41E-08 -1.25E-08 1.10E-09 4.03E-08 5.24E-08 4.18E-08 6.19E-08 3.29E-08
URI (ΔCDF) -9.21E-09 -6.37E-09 -6.37E-09 -6.37E-09 -6.37E-09 -6.37E-09 -6.37E-09 -6.49E-09
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -2.30E-08 -1.90E-08 -5.30E-09 3.40E-08 4.60E-08 3.50E-08 5.60E-08 2.60E-08

To top of page

Licensee Comments:
2Q/17: Changed PRA Parameter(s). Changed PRA Parameter(s).
3Q/16: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: Changed PRA Parameter(s).




Link to Notes

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) 2.24E-07 1.75E-07 2.18E-07 1.88E-07 1.85E-07 1.70E-07 1.72E-07 1.15E-07
URI (ΔCDF) 8.13E-08 9.22E-08 8.68E-08 8.69E-08 8.67E-08 8.84E-08 9.25E-08 3.96E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 3.10E-07 2.70E-07 3.00E-07 2.70E-07 2.70E-07 2.60E-07 2.60E-07 1.50E-07

To top of page

Licensee Comments:
2Q/17: Changed PRA Parameter(s). Changed PRA Parameter(s).
1Q/17: Risk Cap Invoked.
4Q/16: Risk Cap Invoked. 3Q16: U2 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MSPI-001 Rev 18 was approved in June 2016
3Q/16: Risk Cap Invoked. 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
2Q/16: Risk Cap Invoked.
1Q/16: Risk Cap Invoked.
4Q/15: Risk Cap Invoked. 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: Risk Cap Invoked. Changed PRA Parameter(s).




Link to Notes

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) 4.18E-08 -2.39E-08 -2.39E-08 -2.39E-08 2.87E-08 2.87E-08 -2.30E-08 -1.42E-08
URI (ΔCDF) -1.08E-07 -7.64E-08 -7.64E-08 -7.64E-08 -7.64E-08 -7.64E-08 -7.64E-08 -4.91E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value -6.60E-08 -1.00E-07 -1.00E-07 -1.00E-07 -4.80E-08 -4.80E-08 -9.90E-08 -6.30E-08

To top of page

Licensee Comments:
2Q/17: Changed PRA Parameter(s). Changed PRA Parameter(s).
4Q/16: U1-U2 Train A crosstie considered unavailable starting 10/28/11 when standing order 11-057 and 1/2BFRH.1 procedure revisions were issued to remove procedural guidance on use of crosstie modification pending NRC approval. Reference IR 1257908
3Q/16: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: Changed PRA Parameter(s).




Link to Notes

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) 1.85E-07 4.78E-08 3.74E-08 2.63E-08 1.99E-08 3.02E-08 1.49E-08 2.99E-08
URI (ΔCDF) -9.41E-08 -5.50E-08 -5.50E-08 -5.50E-08 -5.50E-08 -5.50E-08 -5.50E-08 -9.36E-08
PLE NO NO NO NO NO NO NO NO
                 
Indicator value 9.10E-08 -7.20E-09 -1.80E-08 -2.90E-08 -3.50E-08 -2.50E-08 -4.00E-08 -6.40E-08

To top of page

Licensee Comments:
2Q/17: Changed PRA Parameter(s). Changed PRA Parameter(s).
3Q/16: Changed PRA Parameter(s). 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016.
4Q/15: Changed PRA Parameter(s).




Link to Notes

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 0.000500 0.000389 0.000383 0.000154 0.000156 0.000168 0.000173 0.000267 0.000191 0.000204 0.000214 0.000220
Technical specification limit 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
                         
Indicator value 0.1 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 0.000234 0.000250 0.000249 0.000256 0.000280 0.000294 0.000294 0.000315 N/A 0.000117 0.000118 0.000130
Technical specification limit 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
                         
Indicator value 0 0 0 0 0 0 0 0 N/A 0 0 0

To top of page

Licensee Comments:
3/17: No steady state data was measured this period due to refueling outage B1R21
9/16: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016. PI




Link to Notes

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 0.040 0.040 0.040 0.090 0.100 0.110 0.130 0.140 0.130 0.110 0.100 0.080
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 0.4 0.4 0.4 0.9 1.0 1.1 1.3 1.4 1.3 1.1 1.0 0.8
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 0.070 0.060 0.050 0.070 0.140 0.270 0.320 0.390 0.080 0.050 0.060 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 0.7 0.6 0.5 0.7 1.4 2.7 3.2 3.9 0.8 0.5 0.6 0.5

To top of page

Licensee Comments:
9/16: 4Q15: Unit 1 CDF and MSPI result were updated using the application specific model BB011b4, which takes credit for the Generation III Westinghouse RCP Shutdown Seals. The corresponding BY-MPSI-001 Rev 17 was approved in January 2016. PI




Link to Notes

Drill/Exercise Performance 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Successful opportunities 27.0 32.0 106.0 44.0 29.0 34.0 28.0 55.0
Total opportunities 27.0 32.0 109.0 44.0 32.0 34.0 28.0 56.0
                 
Indicator value 98.3% 98.3% 98.3% 98.4% 97.9% 98.0% 97.7% 98.1%

To top of page

Licensee Comments: none




Link to Notes

ERO Drill Participation 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Participating Key personnel 72.0 75.0 76.0 78.0 77.0 77.0 78.0 66.0
Total Key personnel 72.0 75.0 76.0 78.0 77.0 77.0 78.0 66.0
                 
Indicator value 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0%

To top of page

Licensee Comments: none




Link to Notes

Alert & Notification System 3Q/15 4Q/15 1Q/16 2Q/16 3Q/16 4Q/16 1Q/17 2Q/17
Successful siren-tests 3962 3903 3897 3902 3900 3780 3964 3904
Total sirens-tests 3965 3904 3904 3904 3904 3782 3965 3904
                 
Indicator value 99.9% 99.9% 99.9% 99.9% 99.9% 99.9% 99.9% 100.0%

To top of page

Licensee Comments: none




Link to Notes

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

To top of page

Licensee Comments: none




Link to Notes

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

To top of page

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