ML16189A255

From kanterella
Jump to navigation Jump to search
Annual Assessment Meeting/Open House (Hand Out)
ML16189A255
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 07/07/2016
From:
Division of Nuclear Materials Safety III
To:
References
Download: ML16189A255 (1)
v • d • e


Text

Dresden Nuclear Power Station Units 2 and 3 Annual Assessment Meeting Open House June 30, 2016 2015 Reactor Oversight Process Nuclear Regulatory Commission - Region III

Our Mission To license and regulate the nations civilian use of byproduct, source, and special nuclear materials to ensure adequate protection of public health and safety, promote the common defense and security, and protect the environment.

2

What We Regulate Reactors Materials Waste

What We Dont Regulate Military Radon X-Rays

Some Nuclear Facts

  • 100 nuclear power plants supply about 20 percent of the electricity in the U.S.
  • Nuclear materials are used in medicine for diagnosis and cancer treatment.
  • Nuclear materials are widely used in industry, such as in density gauges, flow measurement devices, radiography devices, and irradiators.

5

NRC Performance Goals Safety - Ensure adequate protection of public health and safety and the environment Security - Ensure adequate protection in the secure use and management of radioactive materials 6

How We Regulate Regulatory Framework NRCs Safety Mission Strategic Performance Areas Cornerstones Cross-Cutting Areas Human Performance--Safety Conscious Work Environment--Problem Identification &

Resolution

Reactor Oversight Process Strategic Performance Areas Safety Cornerstones Baseline Inspection Performance Indicator Results Results Significance Significance Threshold Threshold Action Matrix Regulatory Response 9

Significance Threshold Performance Indicators Green White Yellow Red Increasing Safety Significance Inspection Findings Green White Yellow Red Increasing Safety Significance

Action Matrix Columns Licensee Regulatory Degraded Multiple/Repetitive Unacceptable Response Response Degraded Performance Increasing

  • Safety Significance
  • Inspection
  • Management Involvement
  • Regulatory Action

National Summary of Plant Performance Status as of 02/22/2016 Licensee Response 90 Regulatory Response 7 Degraded Cornerstone 0 Multiple/Repetitive Deg. Cornerstone 3 Unacceptable 0 IMC 0350 Oversight 0 Total 100 12

National Summary

  • Performance Indicator Results for 2015*

- Green 6686

- White 12

- Yellow 0

- Red 0

  • PIs are counted per plant per quarter
  • Total Inspection Findings in 2015#

- Green 782

- White 8

- Yellow 0

- Red 0

  1. Finding data current as of 2/22/2016 13

NRC Annual Assessment Summary Dresden Nuclear Power Station 2015 Exelon operated the station safely and in a manner that preserved the public health and safety and protected the environment.

Dresden Unit 2 was in the Regulatory Response Column of the NRCs Action Matrix at the start of 2015 in first quarter of 2015 due to a White performance indicator for greater than 3 scrams per 7000 operating hours and remained there until August 7, 2015.

for the last three quarters of 2015 due to a White finding on the inoperability of a Unit 2 Electromatic Relief Valve and remained there until the end of the first quarter of 2016 Dresden Unit 3 was in the Regulatory Response Column for the fours quarter of 2015 due to a White finding on the inoperability of a Unit 3 Electromatic Relief Valve and remained there until December 2, 2015 No Substantive Cross-Cutting Issues were identified 14 14

NRC Inspection Activities Dresden Nuclear Power Station 2015 5307 total hours expended by NRC on Reactor Oversight Process activities 2360 inspector hours of direct inspection activity 733 inspector hours reviewing and observing plant operating status 1291 inspector hours of preparation for and documentation of inspection activities 923 hours0.0107 days <br />0.256 hours <br />0.00153 weeks <br />3.512015e-4 months <br /> for other Reactor Oversight Process elements (e.g., assessments and communications) 15

NRC Inspection Activities Dresden Nuclear Power Station 2015 2 resident inspectors on site - residents produced four quarterly inspection reports and walked through the plant daily 26 other inspectors participated in various inspections 4 major inspections Two Supplemental Inspections for Regulatory Response Column entry Initial Reactor Operator License Examinations Modifications/10 CFR 50.59 Inspection 16

Significance Threshold Performance Indicators Green Baseline Inspection White Requires additional NRC oversight Yellow Requires more NRC oversight Red Requires most NRC oversight Inspection Findings Green Very low safety issue White Low to moderate safety issue Yellow Substantial safety issue Red High safety issue 17

Dresden PIs and Findings January 1 through December 31, 2015 Green Performance Indicators with One White in first quarter of 2015 11 Green/Severity Level IV Inspection Findings 1 White Inspection Finding associated with the Mitigating Systems Cornerstone 18

Safety Significant Findings Dresden Nuclear Power Station NRC Identified one Unit 3 White finding in Fourth Quarter of 2014 which carried over to 2015 NRC Identified one Unit 2 White finding in Second Quarter of 2015 Both Findings Involved one of four Electromatic Relief Valves on each Units Main Steam Lines Valves are designed to rapidly reduce reactor vessel pressure if needed Licensee failed to ensure continued operability of valve with increased steam flows after implementing an approved power uprate

NRC Inspection Findings Some Examples of Green Findings Dresden Nuclear Power Station Failure to prevent foreign material (teflon tape) from degrading a relay in the starting circuit of a emergency diesel generator resulting in diesel generator inoperability Failure to perform Ultimate Heat Sink surveys in accordance with the Quality Assurance Program Failure to ensure procedure revisions did not result in conditions that could cause the Isolation Condenser to be outside of its design conditions 20

NRC Inspection Plans for 2016 Dresden Nuclear Power Station NRC Plans Baseline Inspections for 2016. This includes the following major team inspections:

Component Design Basis Inspection (completed)

Biennial Problem Identification and Resolution Inspection (completed)

Initial Reactor Operator License Examinations 21

Dresden Fukushima Recommendations Status Mitigating Strategies (MS) & Spent Fuel Pool Instrumentation (SFPI) Order

  • MS Order requires strategies to cope with a long term loss of safety systems
  • SFPI Order requires plants to be able to tell if water is at or above certain levels
  • Site Audit was performed in August 2015
  • Site Safety Evaluation scheduled to be issued after the NRC receives the site compliance letter
  • Regional inspection of MS inspection (TI 191, Rev 1) will be performed after Safety Evaluation issued 22

Hardened Vent Order

- Requires that the hardened vents be capable of operating under severe accident conditions

- Licensee Combined Phase 1/Phase 2 Plan submitted in December 2015

- Site Audit Reports will be developed after Sites come into compliance with each Phase of the Order

- Completion expected in 2017 to 2018

- Site inspection will follow 23

Dresden Fukushima Flooding Response Status

  • Flooding Hazard Reevaluations

- Reevaluate Hazards using present-Day information

- Licensee Flooding Evaluation was submitted in 2013 with followup answers to questions in 2014

- Staff assessment issued March 31, 2015 and found Licensees actions sufficient for identified flooding scenarios

- Inspectors completed TI-190 which verified a licensees actions were appropriate to mitigate the evaluated flood levels 24

Dresden Fukushima Seismic Response Status

  • Seismic Walkdowns

- Verify that the site can meet its current requirements for hazard protection

- Walkdowns are complete; Staff assessments issued

  • Seismic Hazard Reevaluations

- Reevaluate Hazards using present-Day information

- Initial Seismic Reevaluations submitted March 31, 2014

- NRC assessment of the initial licensee submittal was issued on April 27, 2015

- NRC assessment in letter dated October 27, 2015, stated licensee full assessment expected in June 2019

  • Sites will evaluate the impacts of the updated Seismic hazards as part of their mitigating strategies assessment.

25

Actions in Response to the Japan Nuclear Accident

  • Mailbox for comments on staff actions:

JLD_Public.Resource@nrc.gov

  • Office of Public Affairs Point of

Contact:

OPA.resource@nrc.gov or 301-415-8200 26

NRC Social Media Channels

Reference Sources

  • Reactor Oversight Process

- http://www.nrc.gov/NRR/OVERSIGHT/ASSESS/index.html

  • Public Electronic Reading Room

- http://www.nrc.gov/reading-rm.html

  • Public Document Room 800-397-4209 (Toll Free) 28
Retrieved from "https://kanterella.com/w/index.php?title=ML16189A255&oldid=2230432"