ML083430607

Request for Additional Information Regarding the 2007 Steam Generator Tube Inspections

ML083430607
Person / Time
Site:	Turkey Point
Issue date:	12/11/2008
From:	Mozafari B Plant Licensing Branch II
To:	Stall J Florida Power & Light Co
Paige, Jason, NRR,301-415-5888
References
TAC MD9234
Download: ML083430607 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 11 , 2008 Mr. J. A. Stall Senior Vice President Nuclear and Chief Nuclear Officer Florida Power and Light Company P.O. Box 14000 Juno Beach, FL 33408-0420

SUBJECT:

TURKEY POINT NUCLEAR PLANT, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE 2007 STEAM GENERATOR TUBE INSPECTION (TAC NO. MD9234)

Dear Mr. Stall:

By letter dated April 3, 2008 (Agencywide Documents Access and Management System Accession No. ML081050248), Florida Power and Light submitted information pertaining to the 2007 steam generator tube inspection performed at Turkey Point Unit 3.

The Nuclear Regulatory Commission staff has reviewed the Turkey Point Unit 3 information and has determined that additional information is required to complete the review.

If you have any questions, please contact me at (301) 415-2020.

Sincerely,

/5~cj:VAI01{~LI f Brenda Mozafari, Senior projec~Janager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-250

Enclosure:

Request for Additional Information cc w/encl: Distribution via ListServ

REQUEST FOR ADDITIONAL INFORMATION 2007 STEAM GENERATOR TUBE INSPECTIONS TURKEY POINT NUCLEAR PLANT UNIT 3 DOCKET NUMBER 50-250

1. For each refueling outage since installation of the steam generators (SGs), please provide the cumulative effective full power months that the SGs have operated.

2. In several instances there are references to inspections performed during "TP3-21."

Is TP3-21, your end of cycle (EOC) 20 inspections, which were performed in 2004?

If TP3-21 refers to EOC 21 (2006), please clarify these statements since the NRC staff was not aware that any SG tube inspections were performed during that outage.

3. Please confirm that there are only eight tubes that are not expanded for the full length of the tubesheet on the hot-leg side of the SGs and one tube that is not expanded for the full length of the tubesheet on the cold-leg side of the SGs.

4. Please discuss the results of your tube plug exams. For example, was any degradation noticed and were all tube plugs verified to be present?

5. In the report, "tube R20 C67 in SG 3C ... was plugged for the outside diameter volumetric indication ... this indication is considered to most likely be a result of manufacturing or installation and not service induced." Please discuss how this conclusion was determined. Please also discuss if this indication was present in prior inspections. It was indicated that the volumetric indication within the hot-leg tubesheet met the initial screening and that subsequent profiling was done. Please clarify what was meant by this indication "met the initial screening." Is the statement implying that since the indication met the initial screening it required profiling? If so, describe the screening criteria.

6. Please describe the scope and results of any secondary side inspections. If any degradation was detected, discuss the extent of the degradation and the basis for not inspecting the other SGs. Also, discuss the results of the foreign object search and retrieval and secondary side upper bundle flush. Include in this discussion the extent to which the quatrefoil-shaped holes are blocked.

Enclosure

- 2

7. There is a statement on page 2 of 15 that volumetric wear due to foreign objects is also not active because the foreign objects are no longer present based on secondary side visual examinations. However, on page 10 of 15, it was indicated that one location (Row 7, Column 45 in SG 38) had evidence of a possible loose part that could not be examined visually because of restricted access. Please confirm that this was the only location with a possible loose part indication that was not visually examined. If not, please describe the other locations and the basis for leaving the nearby tubes in service.

In addition, please confirm that no other loose parts (based on visual examination) were left in the SGs. If loose parts were left in the steam generator, please confirm that an analysis was performed to evaluate the acceptability of leaving these parts in the SGs and provide the results of the analysis.

8. Previously in EOC 19, you indicated that:

None of the tubes in Units 3 or 4 exhibit the characteristic "Seabrook Offset" signature that would indicate they were improperly processed. A small number of tubes were identified for monitoring in future inspections as they had relatively low voltage offsets.

In addition, you indicated that new industry information was recently published with additional recommendations regarding Seabrook screening methods and that you were in the process of updating the screening results to ensure it conforms to the latest industry guidance. The results of this update were to be factored into future inspections. Please discuss the extent towhich you have observed an eddy current offset in either the low row (stress relieved) tubes or the high row tubes. Please discuss the extent to which these tubes were inspected with a rotating probe at the expansion transition or at dents/dings. In addition, please discuss the results of the monitoring of the tubes with the "relatively low voltage offsets" as identified in EOC 19 (if these results were not superseded by the more recent screening methods).

December 11 , 2008 Mr. J. A. Stall Senior Vice President Nuclear and Chief Nuclear Officer Florida Power and Light Company P.O. Box 14000 Juno Beach, FL 33408-0420

SUBJECT:

TURKEY POINT NUCLEAR PLANT, UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE 2007 STEAM GENERATOR TUBE INSPECTION (TAC NO. MD9234)

Dear Mr. Stall:

By letter dated April 3, 2008 (Agencywide Documents Access and Management System Accession No. ML081050248), Florida Power and Light submitted information pertaining to the 2007 steam generator tube inspection performed at Turkey Point Unit 3.

The Nuclear Regulatory Commission staff has reviewed the Turkey Point Unit 3 information and has determined that additional information is required to complete the review.

If you have any questions, please contact me at (301) 415-2020.

Sincerely, IRA BMoroney fori Brenda Mozafari, Senior Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-250

Enclosure:

Request for Additional Information cc wtencl: Distribution via ListServ Distribution:

PUBLIC LPL2-2 RtF RidsNrrLABClayton Resource RidsAcrsAcnwMailCtr Resource RidsRgn2MailCenter Resource Ridsl\J rrDorlLpl2-2 Resource RidsOgcRp Resource J. Paige, NRR RidsNrrDci Resource E. Wong, NRR RidsNrrDciCsgb Resource KKarwoski, NRR RidsNrrPMBMozafari Resource Accession Number' ML083430607 OFFICE LPL2-2/PE LPL2-2/PM LPL2-2/LA CSGB/BC LPL2-2/BC NAME JPai 9 )J-F BMoroney for BMozafari BClayton AHiser memo dated BMoroney for TBovce DATE 12/10/08 12/11/08 12/10/08 09/25/08 12/11/08 OFFICIAL RECORD COPY