ML110690165
| ML110690165 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/14/2011 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Flores R Luminant Generation Co |
| Singal, Balwant, 415-3016, NRR/DORL/LPL4 | |
| References | |
| TAC ME5826 | |
| Download: ML110690165 (4) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 March 14, 2011 Mr. Rafael Flores Senior Vice President and Chief Nuclear Officer Attention: Regulatory Affairs Luminant Generation Company LLC P.O. Box 1002 Glen Rose, TX 76043
SUBJECT:
COMANCHE PEAK NUCLEAR POWER PLANT, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION (TAC NO. ME5826)
Dear Mr. Flores:
Inservice inspections (lSI) of steam generator (SG) tubes playa vital role in assuring SG integrity. Mr. Tim Hope of Luminant Generation Company LLC (Luminant, the licensee) was requested on March 7, 2011, to participate in a telephone conference call with the U.S. Nuclear Regulatory Commission (NRC) staff to discuss the ongoing results of the SG tube inspections to be conducted during the upcoming Comanche Peak Nuclear Power Plant, Unit 2 refueling outage 2RF12. Mr. Jack Hicks of Luminant confirmed on March 7, 2011, that the licensee is willing to support this call. Please note that the call 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 call.
The NRC 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.
Should you have any questions you can contact me at 301-415-3016 or via e-mail at balwant.singal@nrc.gov.
Sincerely, b-> \\w b..S\\ ~,,,,-'~
Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-446
Enclosure:
As stated cc w/encl: Distribution via Listserv
STEAM GENERATOR TUBE INSPECTION DISCUSSION POINTS SPRING 2011 REFUELING OUTAGE 2RF12 LUMINANT GENERATION COMPANY LLC COMANCHE PEAK NUCLEAR POWER PLANT, UNIT 2 DOCKET NO. 50-446 The following discussion points have been prepared to facilitate a telephone conference call to be arranged with Luminant Generation Company LLC (the licensee) licensee to discuss the results of the steam generator (SG) tube inspections to be conducted during the upcoming spring 2011 Comanche Peak Nuclear Power Plant, Unit 2 refueling outage (2RF12). This call is scheduled to occur after the majority of the tubes have been inspected, but before the SG inspection activities have been completed.
The NRC staff plans to document a brief summary of the conference call as well as any material that is provided in support of the call.
- 1.
Please discuss any trends in the amount of primary-to-secondary leakage observed during the recently completed cycle.
- 2.
Please discuss whether any secondary-side pressure tests were performed during the outage and the assoctated results.
- 3.
Please discuss any exceptions taken to the industry guidelines.
- 4.
For each SG, please 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.
- 5.
For each area examined (e.g., tube supports, dent/dings, sleeves, etc.), please 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 (PWSCC) 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, please address whether tube integrity (structural and accident-induced leakage integrity) was maintained during the previous operating cycle. In addition, please discuss whether any location exhibited a degradation mode that had not previously been observed at this location at this unit (e.g., observed circumferential PWSCC at the expansion transition for the first time at this unit).
- 6.
Please describe repair/plugging plans.
Enclosure
- 2
- 7.
Please describe in-situ pressure test and tube-pull plans and results (as applicable and if available).
- 8.
Please 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 (including the source or nature of the loose parts, if known);
if the loose parts were removed from the SG; and indications of tube damage associated with the loose parts.
- 9.
Please discuss the results of any secondary-side inspection and maintenance activities (e.g., in-bundle visual inspections, feeding inspections, sludge lancing, assessing deposit loading, etc).
- 10.
Please discuss any unexpected or unusual results.
- 11.
Please provide the schedule for SG-related activities during the remainder of the current outage.
March 14, 2011 Mr. Rafael Flores Senior Vice President and Chief Nuclear Officer Attention: Regulatory Affairs Luminant Generation Company LLC P.O. Box 1002 Glen Rose, TX 76043
SUBJECT:
COMANCHE PEAK NUCLEAR POWER PLANT, UNIT 2 - UPCOMING STEAM GENERATOR TUBE INSERVICE INSPECTION (TAC NO. ME5826)
Dear Mr. Flores:
Inservice inspections (lSI) of steam generator (SG) tubes playa vital role in assuring SG integrity. Mr. Tim Hope of Luminant Generation Company LLC (Luminant, the licensee) was requested on March 7, 2011, to participate in a telephone conference call with the U.S. Nuclear Regulatory Commission (NRC) staff to discuss the ongoing results of the SG tube inspections to be conducted during the upcoming Comanche Peak Nuclear Power Plant, Unit 2 refueling outage 2RF12. Mr. Jack Hicks of Luminant confirmed on March 7, 2011, that the licensee is willing to support this call. Please note that the call 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 call.
The NRC 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.
Should you have any questions you can contact me at 301-415-3016 or via e-mail at balwant.singal@nrc.gov.
Sincerely, IRA!
Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-446
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPLIV Reading RidsAcrsAcnw_MailCTR Resource RidsNrrDciCsgb Resource RidsNrrDorlLpl4 Resource RidsNrrPMComanchePeak Resource RidsNrrLAJBurkhardt Resource RidsOgcRp Resource RidsRgn4MailCenter Resource CHunt, NRR/DCI/CSGB ADAMS Accession No. ML110690165
- E-mail dated March 3, 2011 E
NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NRR/LPL4/PM BSingal JBurkhardt RTaylor*
MMarkley BSingal 3/14/11 3/11/11 3/3111 3/14/11 3/14/11 OFFICIAL AGENCY