ML020920191
| ML020920191 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 04/04/2002 |
| From: | Stephen Monarque NRC/NRR/DLPM/LPD2 |
| To: | Richard Laufer NRC/NRR/DLPM/LPD2 |
| Monarque S, NRR/DLPM, 415-1544 | |
| References | |
| IEB-02-001, TAC MB4588 | |
| Download: ML020920191 (3) | |
Text
April 4, 2002 MEMORANDUM TO: Richard J. Laufer, Acting Chief, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM:
Stephen R. Monarque, Project Manager, Section 1 /RA/
Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MARCH 25, 2002, CONFERENCE CALL REGARDING SOUTHERN NUCLEAR OPERATING COMPANYS RESPONSE TO NRC BULLETIN 2002-01, REACTOR PRESSURE VESSEL HEAD DEGRADATION AND REACTOR COOLANT PRESSURE BOUNDARY INTEGRITY, FOR VOGTLE ELECTRIC GENERATING PLANT, UNIT 1 (TAC NO. MB4588)
On March 25, 2002, the U.S. Nuclear Regulatory Commission (NRC) staff held a telephone conference call with the staff of Southern Nuclear Operating Company (the licensee) to discuss the results of the reactor vessel head inspections performed at Vogtle Electric Generating Plant, Unit 1, during the March 2002 refueling outage. The list of conference call participants is attached. This call was conducted as a result of the identification of recent reactor vessel head degradation as discussed in NRC Bulletin 2002-01, Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity.
During the call, the licensee indicated they had performed a 100 percent effective visual inspection of the reactor vessel head and penetrations. An effective visual inspection is one in which small amounts of boric acid deposits from vessel head penetration nozzle leaks can be detected and discriminated. This inspection was not compromised by the presence of insulation, existing deposits on the reactor vessel head, or other factors that could interfere with the detection of leakage. A remotely operated crawling device was used to conduct the inspection. As a result of the inspection, there was no evidence of corrosion or deposits; however, there was some minor debris (loose particulate material such as metal shavings).
The debris was decontaminated and the areas were re-inspected with no signs of corrosion.
With respect to the susceptibility of the vessel head penetration nozzles to cracking, Vogtle 1 is considered a low susceptibility plant based on an industry ranking scheme based on operating time and temperature as indicated in NRC Bulletin 2001-01, Circumferential Cracking of Reactor Pressure Vessel Head Penetration Nozzles.
Docket No. 50-424
Attachment:
As stated
April 4, 2002 MEMORANDUM TO: Richard J. Laufer, Acting Chief, Section 1 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM:
Stephen R. Monarque, Project Manager, Section 1 /RA/
Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF MARCH 25, 2002, CONFERENCE CALL REGARDING SOUTHERN NUCLEAR OPERATING COMPANYS RESPONSE TO NRC BULLETIN 2002-01, REACTOR PRESSURE VESSEL HEAD DEGRADATION AND REACTOR COOLANT PRESSURE BOUNDARY INTEGRITY, FOR VOGTLE ELECTRIC GENERATING PLANT, UNIT 1 (TAC NO. MB4588)
On March 25, 2002, the U.S. Nuclear Regulatory Commission (NRC) staff held a telephone conference call with the staff of Southern Nuclear Operating Company (the licensee) to discuss the results of the reactor vessel head inspections performed at Vogtle Electric Generating Plant, Unit 1, during the March 2002 refueling outage. The list of conference call participants is attached. This call was conducted as a result of the identification of recent reactor vessel head degradation as discussed in NRC Bulletin 2002-01, Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity.
During the call, the licensee indicated they had performed a 100 percent effective visual inspection of the reactor vessel head and penetrations. An effective visual inspection is one in which small amounts of boric acid deposits from vessel head penetration nozzle leaks can be detected and discriminated. This inspection was not compromised by the presence of insulation, existing deposits on the reactor vessel head, or other factors that could interfere with the detection of leakage. A remotely operated crawling device was used to conduct the inspection. As a result of the inspection, there was no evidence of corrosion or deposits; however, there was some minor debris (loose particulate material such as metal shavings).
The debris was decontaminated and the areas were re-inspected with no signs of corrosion.
With respect to the susceptibility of the vessel head penetration nozzles to cracking, Vogtle 1 is considered a low susceptibility plant based on an industry ranking scheme based on operating time and temperature as indicated in NRC Bulletin 2001-01, Circumferential Cracking of Reactor Pressure Vessel Head Penetration Nozzles.
Docket No. 50-424
Attachment:
As stated DISTRIBUTION:
PUBLIC RLaufer FRinaldi PDII-1 R/F KKarwoski CHawes SBloom AHiser WBateman ALee SMonarque Accession Number: ML020920191
- See previous concurrence OFFICE PDII-1/PM PDII-1/PM PDII-1/LA PM: EMCB SC(A): PDII-1 NAME FRinaldi SMonarque CHawes SBloom*
RLaufer DATE 4/3/02 4/3/02 4/3/02 4/2/02 4/3/02 OFFICIAL RECORD COPY
Attachment CONFERENCE CALL LIST OF PARTICIPANTS NRC REGION II Kenneth Karwoski, NRR Mark Lesser Steven Bloom, NRR John Zeiler Stephen Monarque, NRR Tom Morrissey SOUTHERN NUCLEAR OPERATING COMPANY Tom Greene Jim Bailey Skip Kitchens Jim Edwards