| Date |
Description |
| 07/16/2015 |
NRC Regulatory Issue Summary 2015-10 "Applicability of ASME Code Case N-770-1 as Conditioned in 10 CFR 50.55a, "Codes and Standards," to Branch Connection Butt Welds" |
| 09/19/2008 |
St. Lucie Retired PZR Safety "A" Nozzle DMW Destructive Examination Report |
| 06/27/2008 |
DMBW status of activities |
| 06/06/2008 |
Pressurizer Nozzle Alloy 82/182 Weld Flaws Identified in a Retired Pressurizer in February 2008, LIC-504 Assessment, Integrated Risk-Informed Decision Making Process for Emergent Issues |
| 02/21/2008 |
Temporary Instruction 2151/172: Reactor Coolant System DMBW |
| 11/01/2007 |
MRP-139 Interim Guidance on Bare Metal Visual Exam Requirements |
| 09/07/2007 |
Safety Assessment on the Advanced FEA Related to Growth of Postulated PWSCC Flaws in Pressurizer Nozzle DMBW |
| 08/13/2007 |
Advanced FEA Evaluation of Growth of Postulated Circumfrential PWSCC Flaws in Pressurizer Nozzle DMBW |
| 12/18/2006 |
Letter from Christine King, EPRI, to Tanya Mensah, NRC, regarding PWR Fleet Survey MRP-139 Implementation Plans for Pressurizers - Revision 1 |
| 11/09/2006 |
Letter from King, C., to Mensah, T., concerning PWR fleet survey – MPR-139 implementations plan for pressurizers. |
| 08/23/2006 |
Letter from Grobe, J., to Riley, J., concerning reporting of MPR-139 inspection findings. |
| 03/29/2006 |
Letter from John A. Grobe, NRC, to Alex Marion, NEI, regarding teleconference between NRC Staff and NEI representatives concerning spring 2006 dissimilar metal butt welds inspection results. |
| 03/02/2006 |
Letter from Grobe, J., to Marion, A., request for cooperation in ASME Code process to revise code requirements for inspection of dissimilar metal butt welds. |
| 02/17/2006 |
Letter from Kenneth Balkey, ASME, to James Dyer on ASME actions to address Alloy 82/182/600 materials |
| 12/20/2005 |
Letter from James Dyer, NRC, to Gary Park, ASME, on PWSCC in RCS Nickel-Based Alloy Butt Welds |
| 10/12/2005 |
Letter from Michael E. Mayfield, NRC, to Alex Marion, NEI, regarding questions & comments to MRP-139, "Primary System Piping Butt Weld Inspection and Evaluation Guidelines". |
| 07/27/2005 |
Letter from Alex Marion, NEI, regarding the Materials Reliability Program inspection plan for piping butt welds. |
| 07/14/2005 |
Materials Reliability Program: Primary System Butt Weld Inspection and Evaluation Guideline (MPR-139). |
| 11/30/2004 |
Materials Reliablility Program: Crack Growth Rates for Evaluation PWSCC of Alloy 82, 182 and 132 Welds (MRP-115NP) |
| 10/19/2004 |
Materials Reliability Program: Probabilistic Risk Assessment of Alloy 82/182 Piping Butt Welds (MRP 116NP) |
| 07/31/2004 |
Materials Reliability Program: Alloy 82/182 Pipe Butt Weld Safety Assessment for US PWR Plant Designs (MRP-113NP) |
| 06/12/2003 |
MRP A600 ITG Butt Weld Working Group slides from public meeting to discuss industry management of various materials degradation issues |
| 04/22/2003 |
Letter from Brian W. Sheron, NRC to Alex Marion, NEI, regarding Pressurized Water Reactor (PWR) Materials Reliability Project Interim Alloy 600 Safety Assessment for U.S. PWR Plants (MRP-44), Part 1: Alloy 82/182 Pipe Butt Welds |
| 07/18/2002 |
Materials Reliablility Program: Crack Growth Rates for Evaluation PWSCC of Thick-Wall Alloy 600 (MRP-55) |
| 06/14/2001 |
Letter from Dr. Brian Sheron, NRC, to Mr. Alex Marion, NEI, regarding Staff Findings Regarding "PWR Materials Reliability Project Interim Alloy 600 Safety Assessment for U.S. PWR Plants (MRP-44), Part 1: Alloy 82/182 Pipe Butt Welds" |
| 05/04/2001 |
Letter from Peter Wen, NRC, to Dr. Theodore Marston, EPRI, regarding "Request for Withholding Information from Public Disclosure, EPRI Letter of April 24, 2001." |
| 04/27/2001 |
Letter from Mr. Alex Marion, NEI, to Dr. Brian Sheron, NRC, regarding "PWR Reactor Piping and Head Penetrations," providing EPRI Report TP1001491 NP, Part 1, "PWR Materials Reliability Project Interim Alloy 600 Safety Assessment for U.S. PWR Plants (MRP-44), Part 1: Alloy 82/182 Pipe Butt Welds," April 2001 |
| 03/15/2001 |
NRC Special Inspection Team Report |
| 02/20/2001 |
Safety Evaluation Report - WCAP-15615, "Integrity Evaluation for Future Operation: Virgil C. Summer Nuclear Plant Reactor Vessel Nozzle to Pipe Weld Regions" (TAC NO. MB0251) |
| 02/09/2001 |
NRC Special Team Meeting with Summer Plant Officials to Discuss Hot Leg Weld Crack Findings |
| 01/02/2001 |
NRC Staff to Meet with Summer Plant Officials to Discuss Pipe Repair Prior to Plant Restart |
| 12/29/2000 |
WCAP-15615, Revision 0, "Integrity Evaluation for Future Operation Virgil C. Summer Nuclear Plant: Reactor Vessel Nozzle to Pipe Weld Regions;" (Non-Proprietary Class 3) |
| 12/26/2000 |
Letter from SCE&G submitting copies of WCAP-15615, "Integrity Evaluation for Future Operation Virgil C. Summer Nuclear Plant: Reactor Vessel Nozzle to Pipe Weld Regions" |
| 12/14/2000 |
Nuclear Energy Institute (NEI) letter to NRC: Reactor Coolant Pipe Cracking Experience |
| 11/16/2000 |
NRC Information Notice (2000-17), Supplement 1 - Crack in Weld Area of Reactor Coolant System Hot Leg Piping at V. C. Summer |
| 11/03/2000 |
NRC's expectations and information needs - V. C. Summer crack in the weld area of the reactor coolant system |
| 10/23/2000 |
NRC's request for information - V. C. Summer crack in the weld area of the reactor coolant system |
| 10/18/2000 |
NRC Information Notice (2000-17) - Crack in Weld Area of Reactor Coolant System Hot Leg Piping at V.C. Summer |
| 10/13/2000 |
Licensee Event Notification (#37423) - Initial discovery of boron on the floor and identification of a 4"long hairline crack |