ML021210716
| ML021210716 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/24/2002 |
| From: | Hernan R NRC/NRR/DLPM/LPD2 |
| To: | Scalice J Tennessee Valley Authority |
| Hernan R W, NRR/NRC/DLPM,301-415-2010 | |
| References | |
| Download: ML021210716 (6) | |
Text
April 24, 2002 Mr. J. A. Scalice Chief Nuclear Officer and Executive Vice President Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
SEQUOYAH NUCLEAR PLANT, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION
Dear Mr. Scalice:
Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is 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 should 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 members of your staff, tentatively scheduled for April 25, 2002, to discuss the ongoing results of the SG tube inspections to be conducted during the upcoming Sequoyah Unit 1 refueling outage. This phone call 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 staff plans to document a brief summary of the conference call as well as any material that you may have provided to the staff in support of the call.
Sincerely,
/RA/
Ronald W. Hernan, Senior Project Manager, Section 2 Project Directorate II Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-327
Enclosure:
List of Discussion Points cc w/encl: See next page April 24, 2002
ML021210716 OFFICE PDII-2/PM PDII-2/LA PDII-2/SC NAME RHernan BClayton TKoshy (A)
DATE 4/23/02 4/23/02 4/24/02
Enclosure STEAM GENERATOR (SG) TUBE INSPECTION DISCUSSION POINTS PREPARED BY THE OFFICE OF NUCLEAR REACTOR REGULATION SEQUOYAH NUCLEAR PLANT, UNIT 2 DOCKET NO. 50-328 The following discussion points have been prepared to facilitate the phone conference arranged with the Tennessee Valley Authority to discuss the results of the SG tube inspections to be conducted during the upcoming Sequoyah Nuclear Plant, Unit 2, refueling outage. This phone call is scheduled to occur towards the end of the planned SG tube inspection interval, but before the unit exits its refueling outage.
The staff plans to document a brief summary of the conference call as well as any material that you may have provided to the staff in support of the call.
Discuss whether any primary to secondary leakage existed in this unit prior to shutdown.
1.
Discuss whether any primary-to-secondary leakage existed in this unit prior to shutdown.
2.
Discuss the results of secondary side hydrostatic tests.
3.
For each steam generator, provide a general description of areas examined, including the expansion criteria utilized and type of probe used in each area.
4.
For analyzed eddy current results, describe bobbin indications (those not examined with rotating pancake coil (RPC)) and RPC/Plus Point/Cecco indications. Include the following information in the discussion: location, number, degradation mode, disposition, and voltages/depths/lengths of significant indications.
5.
Describe repair/plugging plans for the SG tubes that meet the repair/plugging criteria.
6.
Discuss the previous history of SG tube inspection results, including any "look backs" performed.
7.
Discuss, in general, the new inspection findings.
8.
Discuss your use or reliance on the X-probe, if applicable.
9.
Describe in situ pressure test plans and results, if applicable and available, including tube selection criteria.
10.
Describe tube pull plans and preliminary results, if applicable and available; include tube selection criteria.
2 11.
Discuss the assessment of tube integrity for the previous operating cycle.
12.
Discuss the assessment of tube integrity for next operating cycle.
13.
Provide the schedule for steam generator-related activities during the remainder of the current outage.
14.
Discuss what steps have been taken, or will be taken, in response to the lessons learned from the Indian Point Unit 2 tube failure. In addition, please be prepared to discuss the following:
a)
Discuss the actions that are taken in response to identifying a new degradation mechanism, and b)
Discuss the actions taken to ensure that data noise levels are acceptable, and c)
Address data quality issues and the need for criteria to address data quality.
Mr. J. A. Scalice SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority cc:
Mr. Karl W. Singer, Senior Vice President Nuclear Operations Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Jon R. Rupert, Vice President (Acting)
Engineering & Technical Services Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Richard T. Purcell Site Vice President Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 General Counsel Tennessee Valley Authority ET 11A 400 West Summit Hill Drive Knoxville, TN 37902 Mr. Robert J. Adney, General Manager Nuclear Assurance Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801 Mr. Mark J. Burzynski, Manager Nuclear Licensing Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Pedro Salas, Manager Licensing and Industry Affairs Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 Mr. D. L. Koehl, Plant Manager Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Soddy Daisy, TN 37379 Mr. Russell A. Gibbs Senior Resident Inspector Sequoyah Nuclear Plant U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, TN 37379 Mr. Lawrence E. Nanney, Director Division of Radiological Health Dept. of Environment & Conservation Third Floor, L and C Annex 401 Church Street Nashville, TN 37243-1532 County Executive Hamilton County Courthouse Chattanooga, TN 37402-2801 Ms. Ann P. Harris 341 Swing Loop Road Rockwood, Tennessee 37854