Letter Sequence Request |
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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
[Table View] |
Text
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GPU Nuclear Corporation
..j-Ma nn ei 100 interpace earkway EE %Ew a
Parsippany, New Jersey 07054 201 263 6500 TELEX 136-482 Wnter's Direct Dial Number:
February 10, 1984 Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch #5 U.S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Crutchfield:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 SEP Topic No. VI-1 Organic Materials and Postaccident Chemistry During the integrated assessment of the subject SEP topic, the NRC staff requested GPUN representatives to inspect the drywell and torus interiors to determine their condition and coating materials. The safety objective of this topic is to ensure that protective coatings inside the drywell and torus do not consist of material that would decompose in radiation environments and potentially foul pump seals, bearings, or cooling passages; create a hazardous environment; or cause material failures.
Inspection of the drywell and torus interiors were conducted during the current Cycle 10 refueling outage. The attached report entitled "Drywell Coating Evaluation" provides detailed description of the drywell inspection and the results. As indicated in the report, the drywell coating was inspected by performing visual, adhesion and coating thickness measurements.
It was concluded that the drywell coating is in satisfactory condition and does not require repairs at this time. GPUN plans to reinspect the drywell interior walls during the next refueling outage.
Torus interior is being ccated with epoxy (Mobil 78 Series) during the current refueling outage.
Behavior of the coating material under the design basis accident (DBA) condition and application of the material were evaluated.
It was concluded that the material and coating procedure meet the intent of 8402220286 840210 PDR ADOCK 05000219 e
P PDR t
h GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
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. the requirements set forth by American National Standards Institute (ANSI) standard No. N101.2.
Very truly yours, ge _ s.
0 gw u,
P.
B.'
riedler Vice President and Director Oyster Creek 1r cc: Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pa.
19406 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, N. J. 08731 1