ML053190327
| ML053190327 | |
| Person / Time | |
|---|---|
| Site: | Kewaunee  |
| Issue date: | 11/08/2005 |
| From: | Satorius M Division Reactor Projects III |
| To: | |
| References | |
| EA-05-176 | |
| Download: ML053190327 (9) | |
Text
Regulatory Conference Regulatory Conference Kewaunee Turbine Building Flooding Issues Kewaunee Turbine Building Flooding Issues Nuclear Regulatory Commission Nuclear Regulatory Commission -- Region III Region III Lisle, Illinois Lisle, Illinois November 8, 2005 November 8, 2005
Introduction and Opening Remarks Introduction and Opening Remarks Mark Satorius Mark Satorius Director Director Division of Reactor Projects Division of Reactor Projects
Agenda Agenda 1.1.
Introduction and Opening Remarks Introduction and Opening Remarks 2.2.
Overview of Event and Inspection Finding Overview of Event and Inspection Finding a.a. Description of Flooding Issues Description of Flooding Issues b.b. Description of Performance Deficiency Description of Performance Deficiency c.c. Preliminary Safety Significance Determination Preliminary Safety Significance Determination and Apparent Violation and Apparent Violation 3.3.
Licensee Presentation Licensee Presentation 4.4.
NRC Caucus NRC Caucus 5.5.
Closing Remarks Closing Remarks
Description Description
Scenario: Large rupture of pipe or tank in turbine building Scenario: Large rupture of pipe or tank in turbine building
Flood water enters safeguards alley due to insufficient barrie Flood water enters safeguards alley due to insufficient barriers (doors, rs (doors, drains) and affects equipment vital to safe shutdown drains) and affects equipment vital to safe shutdown
Susceptible Class I Equipment: AFW, ESF busses, Susceptible Class I Equipment: AFW, ESF busses, EDGs EDGs, safe shutdown panel
, safe shutdown panel
Past precedent: May 2003 tank overflow resulted in turbine build Past precedent: May 2003 tank overflow resulted in turbine building sump ing sump overflow; water flowed into safeguards alley trench; extent of c overflow; water flowed into safeguards alley trench; extent of condition and ondition and corrective actions inadequate corrective actions inadequate
Extensive modifications made including: robust flood barriers, d Extensive modifications made including: robust flood barriers, drain line check rain line check valves, circulating water pump trips valves, circulating water pump trips
Performance Deficiency Performance Deficiency Failure to meet requirement Failure to meet requirement 10 CFR 50, Appendix B, Criterion III, Design Control 10 CFR 50, Appendix B, Criterion III, Design Control Requires, in part, adequate measures be established to assure th Requires, in part, adequate measures be established to assure that design at design basis for safety basis for safety--related related SSCs SSCs are correctly translated are correctly translated Requires, in part, measures to verify and check adequacy of desi Requires, in part, measures to verify and check adequacy of design gn Cause within licensees ability to foresee and correct Cause within licensees ability to foresee and correct 1972 letter to AEC stating, in part, that non 1972 letter to AEC stating, in part, that non--Class I pipe breaks could Class I pipe breaks could affect Class I equipment, however, plant design (redundancy, des affect Class I equipment, however, plant design (redundancy, design ign arrangement) would not be jeopardized in the event of a pipe bre arrangement) would not be jeopardized in the event of a pipe break ak Safeguards alley trench flood due to turbine building flooding i Safeguards alley trench flood due to turbine building flooding in May 2003 n May 2003
Safety Significance Determination Safety Significance Determination (Preliminary)
(Preliminary)
Phase III Analysis (IMC 0609, Appendix A)
Phase III Analysis (IMC 0609, Appendix A)
Multiple trains of equipment degraded Multiple trains of equipment degraded Licensees preliminary evaluation resulted in change in CDF Licensees preliminary evaluation resulted in change in CDF representative of Yellow safety significance representative of Yellow safety significance Several assumptions under NRC scrutiny Several assumptions under NRC scrutiny Preliminary Greater Preliminary Greater--than than--Green Finding and Green Finding and Apparent Violation of 10 CFR 50, App. B, Criterion Apparent Violation of 10 CFR 50, App. B, Criterion III, Design Control, issued October 6, 2005 III, Design Control, issued October 6, 2005
Licensee Presentation Licensee Presentation
NRC Caucus NRC Caucus
Closing Remarks Closing Remarks Mark Satorius Mark Satorius Director Director Division of Reactor Projects Division of Reactor Projects