Letter Sequence Other |
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Results
Other: 05000366/LER-1984-001, :on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys, 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, GO2-84-512, Discuss GE Recommendations Re Hatch Unit 2 Event Concerning Large Crack in Torus Vent Header Due to Brittle Fracture,Per GE 840214 Info Ltr 402.Only Recommendations 1 & 2 Apply,As Sys Not Yet Used to Inert Containment, ML18029A151, ML20080R767, ML20083L655, ML20083R739, ML20084L425, ML20084L444, ML20084R170, ML20091B787, ML20097E003, ML20097H269, ML20098A026, ML20098F071, ML20098F159, ML20098G674, ML20098G682, ML20198P818, 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
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
Project stage: Other
ML20080N5661984-02-10010 February 1984
Forwards Drywell Coating Evaluation, Technical Data Rept, Per SEP Topic VI-1, Organic Matls & Post-Accident Chemistry
Project stage: Request
ML20198P8181984-02-14014 February 1984
Svc Instruction Ltr 402, Wetwell/Drywell Inerting. Related Info Encl
Project stage: Other
05000366/LER-1984-001, :on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys1984-03-0404 March 1984
- on 840203,personnel Detected Fracture in 66- Inch Vent Header in Bay 5.Caused by Brittle Facture of Vent Header Matl.Vent Header Will Be Repaired & Addl Changes or Sys Mod Will Be Made to Improve Sys
Project stage: Other
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
Project stage: Meeting
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
Project stage: Other
ML20084L4441984-03-31031 March 1984
Analysis of Vent Header Cracking at Hatch 2
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
GO2-84-512, Discuss GE Recommendations Re Hatch Unit 2 Event Concerning Large Crack in Torus Vent Header Due to Brittle Fracture,Per GE 840214 Info Ltr 402.Only Recommendations 1 & 2 Apply,As Sys Not Yet Used to Inert Containment1984-09-14014 September 1984
Discuss GE Recommendations Re Hatch Unit 2 Event Concerning Large Crack in Torus Vent Header Due to Brittle Fracture,Per GE 840214 Info Ltr 402.Only Recommendations 1 & 2 Apply,As Sys Not Yet Used to Inert Containment
Project stage: 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 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
Project stage: Other
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
Project stage: Supplement
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
Project stage: Other
ML20097H2691984-09-17017 September 1984
Forwards Response to GE Significant Info Ltr 402 & IE Info Notice 84-17 Re Nitrogen Inerting Sys
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
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
Project stage: Other
ML18029A1511984-10-0505 October 1984
Forwards Responses to GE Svc Info Ltr 402 Re Wetwell/Drywell Inerting.Operating Instructions for Containment Inerting Sys & Primary Containment Sys Revised
Project stage: Other
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
Project stage: Meeting
1984-04-05
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Similar Documents at Hatch |
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Text
Georgia Power Company -
333 P<edmont Avenue Atlanta, Georgia 30308 Telephone 404 5266526 Ma$ng Address:
Post office Box 4545 Atlanta, Georgia 30302 Georgia Power L T. Gucwa Ine sout%vn electnc system Manager Nuclear Engineenng NED-84-234 and chief Nuclear Engineer May 7, 1984 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Comnission Washington, D. C.
20555 NRC DOCKET 50-366 OPERATING LICENSE NPF-5 EDWIN I. HA'ICH NUCLEAR PLANT UNIT 2 VENT HEADER CRACK _
Gentlenen:
As part of the evaluation of the vent header cracking incident at Plant Hatch Unit 2, a thermal stress analysis was performed by General Electric Cmpany. 'Ihe results of that analysis are doctmented in the attached report.
The analysis shows that:
(1) the observed cracking can be explained by the injection of cold nitrogen into the contaiment, (2) any cracking is expected to be through-wall, making it detectable by visual inspection or leak testing, and (3) the critical crack length for a IOCA (the smallest through-wall crack which would propagate under IOCA conditions) is largo enough that it would be detected by routine visual inspection.
Please contact this office if there are any questions.
Very truly yours, g 7~ e m L. T. Gucwa JH/mb Enclosure xc (w/ encl):
J. T. Beckhan, Jr.
H. C. Nix, Jr.
J. P. O'Reilly (NRC-Region II)
Senior Resident Inspector 8405140457 840507 PDR ADOCK 05000366 S
PDR
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