ML052690119
| ML052690119 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/28/2005 |
| From: | Donohew J NRC/NRR/DLPM/LPD4 |
| To: | Ray H Southern California Edison Co |
| Donohew J N, NRR/DLPM,415-1307 | |
| References | |
| TAC MC8395 | |
| Download: ML052690119 (7) | |
Text
September 28, 2005 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128
SUBJECT:
SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION (TAC NO. MC8395)
Dear Mr. Ray:
Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is being maintained. As required by the plant Technical Specifications, reporting requirements range from submitting a special report, within 15 days following completion of each inservice inspection of SG tubes, that identifies the number of tubes plugged and/or repaired; to submitting a special report, within 12 months following completion of the inspection, that provides complete results of the SG tube inservice inspection.
The special report containing the complete results shall include the following:
- 1. Number and extent of tubes inspected.
- 2. Location and percent of wall-thickness penetration for each indication of an imperfection.
- 3. Identification of tubes plugged and/or repaired.
A phone conference has been arranged with your staff to discuss results of the SG tube inspections to be conducted during the upcoming refueling outage for San Onofre Nuclear Generating Station, Unit 2. This phone call is currently not scheduled. It will occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed. Attached is a list of discussion points to facilitate this phone conference. The Nuclear Regulatory Commission (NRC) staff will document a brief summary of the conference call as well as any material that your staff has provided the NRC staff in support of the call.
Sincerely,
/RA/
Jack Donohew, Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-361
Enclosure:
List of Discussion Points cc w/encl: See next page
Mr. Harold B. Ray September 28, 2005 Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128
SUBJECT:
SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION (TAC NO. MC8395)
Dear Mr. Ray:
Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is being maintained. As required by the plant Technical Specifications, reporting requirements range from submitting a special report, within 15 days following completion of each inservice inspection of SG tubes, that identifies the number of tubes plugged and/or repaired; to submitting a special report, within 12 months following completion of the inspection, that provides complete results of the SG tube inservice inspection.
The special report containing the complete results shall include the following:
- 1. Number and extent of tubes inspected.
- 2. Location and percent of wall-thickness penetration for each indication of an imperfection.
- 3. Identification of tubes plugged and/or repaired.
A phone conference has been arranged with your staff to discuss results of the SG tube inspections to be conducted during the upcoming refueling outage for San Onofre Nuclear Generating Station, Unit 2. This phone call is currently not scheduled. It will occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed. Attached is a list of discussion points to facilitate this phone conference. The Nuclear Regulatory Commission (NRC) staff will document a brief summary of the conference call as well as any material that your staff has provided the NRC staff in support of the call.
Sincerely,
/RA/
Jack Donohew, Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation DISTRIBUTION Docket No. 50-361 PUBLIC LLund PDIV-2 r/f CLauron
Enclosure:
List of Discussion Points RidsNrrDlpmLpdiv (HBerkow) RidsOgcRp RidsNrrDlpmLpdiv2 RidsAcrsAcnwMailCenter cc w/encl: See next page RidsNrrLALFeizollahi RidsRgn4MailCenter (TPruett)
RidsNrrPMJDonohew DCollins ACCESSION NO: ML052690119 NRR-106 OFFICE PDIV-2/PM PDIV-2/LA PDIV-2/SC(A)
NAME JDonohew:sp LFeizollahi DCollins DATE 9/28/05 9/26/05 9/28/05 OFFICIAL RECORD COPY
STEAM GENERATOR TUBE INSPECTION DISCUSSION POINTS PREPARED BY THE OFFICE OF NUCLEAR REACTOR REGULATION SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 DOCKET NO. 50-361 The following discussion points have been prepared by the Nuclear Regulatory Commission (NRC) staff to facilitate the phone conference that has been arranged with Southern California Edison Company (the licensee) to discuss the results of the steam generator (SG) tube inspections to be conducted during the upcoming refueling outage for San Onofre Nuclear Generating Station, Unit 2. This phone call will occur toward the end of the planned SG tube inspection interval, but before the unit completes the inspections and repairs.
The NRC staff plans to document the conference call in a letter with a brief summary of what was discussed in the call that will include any material that is provided by the licensee in support of the call.
- 1. Discuss any trends in the amount of primary-to-secondary leakage observed during the recently completed cycle.
- 2. Discuss whether any secondary side pressure tests were performed during the outage and the associated results.
- 3. Discuss any exceptions taken to the industry guidelines.
- 4. For each steam generator, provide a description of the inspections performed including the areas examined and the probes used (e.g., dents/dings, sleeves, expansion-transition, U-bends with a rotating probe), the scope of the inspection (e.g., 100 percent of dents/dings greater than 5 volts and a 20 percent sample between 2 and 5 volts), and the expansion criteria. Also, discuss the extent of the rotating probe inspections performed in the portion of the tube below the expansion transition region (reference NRC Generic Letter 2004-01, "Requirements for Steam Generator Tube Inspections").
- 5. For each area examined (e.g., tube supports, dents/dings, sleeves, etc.), provide a summary of the number of indications identified to-date of each degradation mode (e.g.,
number of circumferential primary water stress corrosion cracking indications at the expansion transition). For the most significant indications in each area, provide an estimate of the severity of the indication (e.g., provide the voltage, depth, and length of the indication). In particular, address whether tube integrity (structural and accident induced leakage integrity) was maintained during the previous operating cycle. In addition, discuss whether any location exhibited a degradation mode that had not previously been observed at this location at this unit (e.g., observed circumferential primary water stress corrosion cracking at the expansion transition for the first time at this unit).
- 6. Describe repair/plugging plans.
- 7. Describe in-situ pressure test and tube pull plans and results (as applicable and if available).
- 8. Provide the schedule for steam generator-related activities during the remainder of the current outage.
- 9. Discuss the following regarding loose parts:
- What inspections are performed to detect loose parts?
- A description of any loose parts detected and their location within the SG
- If the loose parts were removed from the SG
- Indications of tube damage associated with the loose parts
- The source or nature of the loose parts, if known
San Onofre Nuclear Generating Station Units 2 and 3 cc:
Mr. Daniel P. Breig, Plant Manager Mr. Ed Bailey, Chief Nuclear Generation Radiologic Health Branch Southern California Edison Company State Department of Health Services San Onofre Nuclear Generating Station Post Office Box 997414 (MS7610)
P. O. Box 128 Sacramento, CA 95899-7414 San Clemente, CA 92674-0128 Resident Inspector/San Onofre NPS Mr. Douglas K. Porter c/o U.S. Nuclear Regulatory Commission Southern California Edison Company Post Office Box 4329 2244 Walnut Grove Avenue San Clemente, CA 92674 Rosemead, CA 91770 Mayor Mr. David Spath, Chief City of San Clemente Division of Drinking Water and 100 Avenida Presidio Environmental Management San Clemente, CA 92672 P. O. Box 942732 Sacramento, CA 94234-7320 Mr. James T. Reilly Southern California Edison Company Chairman, Board of Supervisors San Onofre Nuclear Generating Station County of San Diego P.O. Box 128 1600 Pacific Highway, Room 335 San Clemente, CA 92674-0128 San Diego, CA 92101 Mr. James D. Boyd, Commissioner Eileen M. Teichert, Esq. California Energy Commission Supervising Deputy City Attorney 1516 Ninth Street (MS 31)
City of Riverside Sacramento, CA 95814 3900 Main Street Riverside, CA 92522 Mr. Ray Waldo, Vice President Southern California Edison Company Mr. Gary L. Nolff San Onofre Nuclear Generating Station Power Projects/Contracts Manager P.O. Box 128 Riverside Public Utilities San Clemente, CA 92764-0128 2911 Adams Street Riverside, CA 92504 Mr. Brian Katz Vice President, Nuclear Oversight and Regional Administrator, Region IV Regulatory Affairs.
U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station 611 Ryan Plaza Drive, Suite 400 P.O. Box 128 Arlington, TX 76011-8064 San Clemente, CA 92764-0128 Mr. Michael Olson Mr. Steve Hsu San Diego Gas & Electric Company Department of Health Services P.O. Box 1831 Radiologic Health Branch San Diego, CA 92112-4150 MS 7610, P.O. Box 997414 Sacramento, CA 95899 August 2005