ML041000562

Steam Generator Tube Inservice Inspection for 10th Refueling Outage (1RF10)

ML041000562
Person / Time
Site:	Comanche Peak
Issue date:	04/09/2004
From:	Thadani M NRC/NRR/DLPM/LPD4
To:	Blevins M TXU Electric
Thadani M, NRR/DLPM, 415-1476
References
TAC MC2564
Download: ML041000562 (5)

Text

April 9, 2004 Mr. M. R. Blevins Senior Vice President

& Principal Nuclear Officer TXU Energy ATTN: Regulatory Affairs P. O. Box 1002 Glen Rose, TX 76043

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES), UNIT 1 - STEAM GENERATOR (SG) TUBE INSERVICE INSPECTION FOR 10th REFUELING OUTAGE (1RF10) (TAC NO. MC2564)

Dear Mr. Blevins:

Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is maintained. The plant Technical Specifications 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 of SG tube inservice inspection 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 telephone conference has been arranged with Messrs F. Madden and D. Buschbaum of your staff to discuss the results of the SG tube inspections to be conducted during the ongoing CPSES Unit 1 refueling outage 1RF10. This telephone conference will occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed.

Enclosed is a list of discussion points to facilitate this telephone conference.

The staff plans to document a brief summary of the telephone conference as well as any material that the licensee may have provided to the staff in support of the call.

Sincerely,

/RA/

Mohan C. Thadani, Senior Project Manager, Section 1 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-445

Enclosure:

List of Discussion Points cc w/encl: See next page

April 9, 2004 Mr. M. R. Blevins Senior Vice President

& Principal Nuclear Officer TXU Energy ATTN: Regulatory Affairs P. O. Box 1002 Glen Rose, TX 76043

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES), UNIT 1 - STEAM GENERATOR (SG) TUBE INSERVICE INSPECTION FOR 10th REFUELING OUTAGE (1RF10) (TAC NO. MC2564)

Dear Mr. Blevins:

Inservice inspections of steam generator (SG) tubes play a vital role in assuring that adequate structural integrity of the tubes is maintained. The plant Technical Specifications 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 of SG tube inservice inspection 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 telephone conference has been arranged with Messrs F. Madden and D. Buschbaum of your staff to discuss the results of the SG tube inspections to be conducted during the ongoing CPSES Unit 1 refueling outage 1RF10. This telephone conference will occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed.

Enclosed is a list of discussion points to facilitate this telephone conference.

The staff plans to document a brief summary of the telephone conference as well as any material that the licensee may have provided to the staff in support of the call.

Sincerely,

/RA/

Mohan C. Thadani, Senior Project Manager, Section 1 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-445

Enclosure:

List of Discussion Points cc w/encl: See next page DISTRIBUTION:

PUBLIC RidsNrrDlpmLpdiv (HBerkow) RidsNrrDlpmLpdiv1 (RGramm) RidsNrrLADJohnson PDIV-1 R/F RidsNrrPMMThadani RidsRgn4MailCenter (AHowell) RidsOgcRp WJohnson RidsAcrsAcnwMailCenter RidsNrrLADBaxley GMakar Accession No.:ML041000562 OFFICE PDIV-1/PM PDIV-1/LA PDIV-1/SC NAME MThadani DBaxley MThadani for RGramm DATE 4/9/04 4/9/04 4/9/04 OFFICIAL RECORD COPY

STEAM GENERATOR (SG) TUBE INSPECTION DISCUSSION POINTS PREPARED BY THE OFFICE OF NUCLEAR REACTOR REGULATION TXU GENERATION COMPANY LP COMANCHE PEAK STEAM ELECTRIC STATION (CPSES), UNIT 1 DOCKET NO. 50-445 The following discussion points have been prepared to facilitate the telephone conference arranged with the licensee to discuss the results of the SG tube inspections to be conducted during the ongoing CPSES, Unit 1 refueling outage (1RF10). This telephone conference is scheduled to occur toward the end of the planned SG tube inspection interval, but before the unit exits its refueling outage.

The NRC staff plans to document a brief summary of the telephone conference as well as any material that the licensee may have provided to the staff in support of the call.

1. Discuss whether any primary to secondary leakage existed in this unit prior to shutdown.

2. Discuss the results of secondary side pressure tests.

3. For each SG, provide a description of areas examined, including the expansion criteria utilized and type of probe used in each area. Also, the licensee should be prepared to discuss its inspection of the tubes within the tubesheet, particularly the portion of the tube below the expansion/transition region.

4. Discuss any exceptions taken to the industry guidelines.

5. Provide a summary of the number of indications identified to-date of each degradation mode and SG tube location (e.g., tube support plate, top-of-tubesheet, etc.). Also provide information, such as voltages, and estimated depths and lengths of the most significant indications.

6. Describe repair/plugging plans for the SG tubes that meet the repair/plugging criteria.

7. Discuss the previous history of SG tube inspection results, including any "look backs" performed. Specifically for significant indications or indications where look backs are used in support of dispositioning (e.g., manufacturing burnish marks).

8. Discuss, in general, new inspection findings (e.g., degradation mode or location of degradation new to this unit).

9. Discuss the use of or reliance on inspection probes (eddy current or ultrasonic) other than bobbin and typical rotating probes, if applicable.

ENCLOSURE

10. Describe in-situ pressure test plans and results, if applicable and available, including tube selection criteria.

11. Describe tube pull plans and preliminary results, if applicable and available; including tube selection criteria.

12. Discuss the assessment of tube integrity for the previous operating cycle (i.e., condition monitoring).

13. Provide the schedule for SG-related activities during the remainder of the current outage.

14. Discuss the following regarding loose parts:

• what inspections are performed to detect loose parts,

• describe if any loose parts were detected, their location within the SG,

• if the loose parts were removed from the SG,

• indications of tube damage associated with the loose parts, and

• the source or nature of the loose parts if known

15. Discuss any changes to data analysis guidelines that will be implemented during the outage.

16. Describe any actions (e.g. training) that have been implemented to ensure the quality of the data analysis and resolution will be as high as that ultimately reached during the last outage (1RF9).

17. Describe any plans for inserting Judas (cobra) tubes into the data stream.

Comanche Peak Steam Electric Station cc:

Mr. Brian Almon Senior Resident Inspector Public Utility Commission U.S. Nuclear Regulatory Commission William B. Travis Building P. O. Box 2159 P. O. Box 13326 Glen Rose, TX 76403-2159 1701 North Congress Avenue Austin, TX 78701-3326 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Ms. Susan M. Jablonski 611 Ryan Plaza Drive, Suite 400 Office of Permitting, Remediation Arlington, TX 76011 and Registration Texas Commission on Environmental Mr. Roger D. Walker Quality Regulatory Affairs Manager MC-122 TXU Generation Company LP P. O. Box 13087 P. O. Box 1002 Austin, TX 78711-3087 Glen Rose, TX 76043 Terry Parks, Chief Inspector George L. Edgar, Esq. Texas Department of Licensing Morgan Lewis and Regulation 1111 Pennsylvania Avenue, NW Boiler Program Washington, DC 20004 P. O. Box 12157 Austin, TX 78711 County Judge P. O. Box 851 Glen Rose, TX 76043 Environmental and Natural Resources Policy Director Office of the Governor P. O. Box 12428 Austin, TX 78711-3189 Mr. Richard A. Ratliff, Chief Bureau of Radiation Control Texas Department of Health 1100 West 49th Street Austin, TX 78756-3189 March 2003