TAC:54150
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Other: BECO-84-150, Responds to IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. Util Endorses GE Svc Info Ltr 402 Recommendations.Equipment Damage Has Not Occurred & Inerting Sys Operation Suitable, FVY-84-110, Forwards Response to NRC Request Re Actions Taken in Response to GE Significant Info Ltr 420 Concerning Hatch-2 Vent Header Crack, ML20080R767, ML20083L655, ML20083R739, ML20084L425, ML20084L444, ML20084R170, ML20091B787, ML20097E003, ML20097H269, ML20098A026, ML20098F071, ML20098F159, ML20098G674, ML20098G682, NLS8400242, Submits List of Actions Taken on Recommendations from GE 840214 Svc Info Ltr 402, Wetwell/Drywell Inerting. Evaluation of Inerting Sys Design Determined That Failure of Cold Temp Shutdown Switch Cause of Problem, SNRC-1082, Submits Status of Evaluation Re IE Info Notice 84-17, Problems W/Liquid Nitrogen Cooling Components Below Nil Ductility Temp & GE Svc Info Ltr SIL-402, Wetwell/Drywell Inerting | |
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MONTHYEARML20080R7671984-02-10010 February 1984
[table view]Responds to IE Bulletin 84-01 Re Insp for Cracks in Mark I Containment Torus Vent Header.No Apparent Cracking or Relevant Indications Found on Unit 1.No Addl Cracking Found Beyond Original Cracking on Unit 2 ML20080N5661984-02-10010 February 1984 Forwards Drywell Coating Evaluation, Technical Data Rept, Per SEP Topic VI-1, Organic Matls & Post-Accident Chemistry ML20087H1481984-03-13013 March 1984 Forwards GE Repts on Metallographic Exam of Metal Samples Taken from Cracked Vent Header,Per NRC 840206 Meeting W/ Util,Bwr Regulatory Response Group & Ge.Vent Header Cracking Brittle Fracture Caused by Injection of Cold Nitrogen ML20083L6551984-03-30030 March 1984 Submits Info on IE Bulletin 84-01, Entitled Cracks in BWR Mark I Containment Vent Headers. Primary Containment Drywell to Torus Bypass Tests Performed.Status of GE SIL 402 Recommended Actions Listed ML20084L4441984-03-31031 March 1984 Analysis of Vent Header Cracking at Hatch 2 ML20084R1701984-04-0505 April 1984 Comments on Status of Recommendations of GE Svc Info Ltr 402 Re Wetwell/Drywell Inerting.Evaluation of Nitrogen Inerting Sys Design Performed & Redundant Low Temp Shutoff Valve Added ML20083R7391984-04-18018 April 1984 Forwards Response to GE SIL 402 Generated Due to Large Crack in Torus Vent Header at Another Operating Plant Attributed to Brittle Fracture Identified During Insp of Cold Nitrogen Into Torus During Inerting ML20084L4251984-05-0707 May 1984 Forwards Analysis of Vent Header Cracking at Hatch 2. Analysis Shows That Observed Cracking Can Be Explained by Injection of Cold Nitrogen Into Containment & Any Cracking Expected to Be through-wall,detectable by Visual Insp ML20091B7871984-05-23023 May 1984 Provides Status of GE Svc Info Ltr 402 Re Vent Header Cracking Incident.Recommended Ultrasonic Testing Not Planned Due to Lack of Baseline Test Data.Cracking from Injection of Cold Nitrogen Detectable by Surface Exam NLS8400242, Submits List of Actions Taken on Recommendations from GE 840214 Svc Info Ltr 402, Wetwell/Drywell Inerting. Evaluation of Inerting Sys Design Determined That Failure of Cold Temp Shutdown Switch Cause of Problem1984-09-12012 September 1984 Submits List of Actions Taken on Recommendations from GE 840214 Svc Info Ltr 402, Wetwell/Drywell Inerting. Evaluation of Inerting Sys Design Determined That Failure of Cold Temp Shutdown Switch Cause of Problem FVY-84-110, Forwards Response to NRC Request Re Actions Taken in Response to GE Significant Info Ltr 420 Concerning Hatch-2 Vent Header Crack1984-09-14014 September 1984 Forwards Response to NRC Request Re Actions Taken in Response to GE Significant Info Ltr 420 Concerning Hatch-2 Vent Header Crack BECO-84-150, Responds to IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. Util Endorses GE Svc Info Ltr 402 Recommendations.Equipment Damage Has Not Occurred & Inerting Sys Operation Suitable1984-09-14014 September 1984 Responds to IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. Util Endorses GE Svc Info Ltr 402 Recommendations.Equipment Damage Has Not Occurred & Inerting Sys Operation Suitable ML20097E0031984-09-14014 September 1984 Forwards Response to IE Bulletin 84-01 Re Potential for Cracking in BWR Vent Headers Using Nitrogen Inerting Sys. Nitrogen Inerting Sys Not Used at Facility.Recommendations Identified in GE Svc Info Ltr 402 Addressed ML20098G5571984-09-14014 September 1984 Submits Supplemental Info in Response to IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. Program Initiated to Address Concerns of GE SIL 402 & Implementation Schedule ML20098A0261984-09-17017 September 1984 Forwards Responses to Recommendations Contained in IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers & GE Svc Info Ltr 402, Wetwell/Drywell Inerting. No Anomalies Indicated in Drywell/Wetwell Pressures ML20097H2691984-09-17017 September 1984 Forwards Response to GE Significant Info Ltr 402 & IE Info Notice 84-17 Re Nitrogen Inerting Sys SNRC-1082, Submits Status of Evaluation Re IE Info Notice 84-17, Problems W/Liquid Nitrogen Cooling Components Below Nil Ductility Temp & GE Svc Info Ltr SIL-402, Wetwell/Drywell Inerting1984-09-18018 September 1984 Submits Status of Evaluation Re IE Info Notice 84-17, Problems W/Liquid Nitrogen Cooling Components Below Nil Ductility Temp & GE Svc Info Ltr SIL-402, Wetwell/Drywell Inerting ML20098F1591984-09-26026 September 1984 Submits Mods Identified for Completion Prior to Liquid Nitrogen Inerting of Containment.Low Temp Switch Will Be Replaced & Relocated to Improve Response Time & Eliminate Adverse Impact of Cold Outdoor Ambient Temps ML20098F0711984-09-27027 September 1984 Responds to GE Svc Info Ltr 402 Re Wetwell/Drywell Temp. Design & Operation of Nitrogen Sys Provides Adequate Assurance That Impingement of Liquid or Extremely Cold Nitrogen Against Vital Plant Components Will Not Occur ML20098G6741984-10-0101 October 1984 Responds to IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. No Evidence of Outside or Inside Vent Header & Nitrogen Penetration Cracking Found.Addl Insps & Evaluations Will Be Performed ML20098G6821984-10-0101 October 1984 Responds to Verbal Questions Concerning Recommendations of GE Svc Info Ltr 402 Re IE Bulletin 84-01, Cracks in BWR Mark I Containment Vent Headers. Steps Taken to Evaluate & Implement Containment Inerting Recommendations ML20138A2251985-11-29029 November 1985 Summarizes 851108 Mgt Meeting at Region II Ofc Re Util Response to Recommendations of Svc Info Ltr 402 in Handling Unit 1 Nitrogen Inerting & Purge Line Crack Discovered on 841215.Summary of Topics & List of Attendees Encl 1984-05-23 | |
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