L-2006-217, Day Post Outage Steam Generator Report Technical Specification 4.4.5.5.c

Day Post Outage Steam Generator Report Technical Specification 4.4.5.5.c

ML062710350
Person / Time
Site:	Saint Lucie
Issue date:	09/20/2006
From:	Johnston G Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2006-217
Download: ML062710350 (5)

Text

0 Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 September 20, 2006 FPL L-2006-217 10 CFR 50.4 10 CFR 50.36 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: St. Lucie Unit 2 Docket No. 50-389 120-day Post Outage Steam Generator Report Technical Specification 4.4.5.5.c Pursuant to Technical Specification 4.4.5.5.c and 6.9.2, attached is the SL2-16 120-day post outage steam generator special report for indications found in the tubesheet region (including the expansion transition) of the St. Lucie Unit 2 steam generators.

Please contact Ken Frehafer at (772) 467-7748 if there are any questions about this submittal.

Very truly yours, GLJ/KWF Attachment an FPL Group company 1"0 1

PSL-ENG-SESJ-06-032, Rev. 0 Attachment 1, Page 1 of 4 Introduction In accordance with Plant Technical Specification (TS) Section 4.4.5.5.c., this special report provides information concerning indications found in the tubesheet region (including the expansion transition) of the St. Lucie Unit 2 steam generators (SG).

The complete results of the steam generator tube inservice inspection will be submitted to the commission in a separate special report within 12 months following completion of the inspection in accordance with TS 4.4.5.5.b. However, TS 4.4.5.5.c. requires indications found in the tubesheet region to be reported within 120 days after the RCS reenters MODE 4.

Discussion In-service examination and plugging of the St. Lucie Unit 2 steam generators was completed between April 28, 2006 and May 14, 2006 during the SL2-16 refueling outage. Inspection of the tubesheet region consisted of +PointM rotating probe examination as follows:

• 100% of active hot leg tubes +3"/-13" as referenced from the top of tubesheet

• All cold leg tubes in peripheral high flow regions for foreign object wear +3"/-2" as referenced from the top of tubesheet

• Full depth tubesheet inspection of all Hot & Cold Leg Tubes with No Tube Expansion Table 1 provides the information required by TS 4.4.5.5.c.1. A total of five indications were found in the tubesheet region during the SL2-16 inspection. All indications are axial in orientation with a maximum through-wall penetration of 39% or less and a length of 0.4 inches or less. One of the indications initiated from the inside diameter (ID) and the remainder initiated from the outside diameter (OD) surface.

Figures 1 and 2 provide the cumulative number of indications detected in the tubesheet region as a function of elevation within the tubesheet for SG 2A and 2B respectively as required by TS 4.4.5.5.c.2. The period of time in which degradation has been experienced in the tubesheet region at St. Lucie Unit 2 extends from SL2-8 through SL2-16. The total cumulative indications found in the tubesheet region during this period is 79 in SG 2A and 92 in SG 2B.

Pursuant to TS 4.4.5.5.c.3, the total projected end-of-cycle accident induced leakage from all sources for SG 2A is 0.029 gpm, and for SG 2B is 0.028 gpm. The projected leakage is from the tubesheet region and is based on the methodology approved by the NRC in license amendment 143 (April 11, 2006, TAC NO. MC5084). No additional leakage is projected from other sources. The total projected leakage is below the limit assumed in the UFSAR (216 gpd or 0.15 gpm) and, therefore, NRC notification prior to Unit restart was not required.

St. Lucie Unit 2 L-2006-217 Docket No. 50-389 Attachment SL2-16 120-day Post Outage Steam Generator Report Page 2 of 4 Technical Specification 4.4.5.5.c Table 1 St. Lucie Unit 2 Steam Generator Tubing Indications Found In The Tubesheet Region (Including the Expansion Transition) at SL2-16 Exam Inch Max Circular Axial Count Date Depth SG Row Line Elev ( Orientation %TW Degrees Inches Volts ID/OD? Ind 1 Apr-06 13" SGA 29 107 TSH -0.69 Axial 39 n/a 0.4 0.53 ID SAI 2 Apr-06 13" SGA 41 113 TSH 0.2 Axial 5 n/a 0.17 0.15 OD SAI 3 Apr-06 13" SGA 50 110 TSH 0.15 Axial 5 n/a 0.17 0.11 OD SAI 4 Apr-06 13" SGA 73 71 TSH 0.15 Axial 27 n/a 0.29 0.17 OD SAI 5 Apr-06 13" SGA 75 79 TSH 0.44 Axial 24 n/a 0.35 0.19 OD SAI Total IndicationS SGA: 5 SGB: None Note: (1) Indication search window ranged from the tube-end to 0.5 inches above the top-of-tubesheet.

Acronyms:

SAI Single Axial Indication TSH Tubesheet Hot Side ID Inside Diameter OD Outside Diameter

St. Lucie Unit 2 L-2006-217 Docket No. 50-389 Attachment SL2-16 120-day Post Outage Steam Generator Report Page 3 of 4 Technical Specification 4.4.5.5.c Figure 1 - SL2-8 through SL2-16 PSL2 SGA Distribution of TubeSheet Indications Number of Indications 0 2 4 6 8 10 12 14 16 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00

-0.05 4..

-0.10

-0.15 0c-0

-0.20

-0.25 0 -0.30

-j -0.35

-0.40

-0.45

-0.50

-5.00

-10.00

-15.00

-20.00

-21.50 (TTS - Top of Tubesheet)

St. Lucie Unit 2 L-2006-217 Docket No. 50-389 Attachment SL2-16 120-day Post Outage Steam Generator Report Page 4 of 4 Technical Specification 4.4.5.5.c Figure 2 - SL2-8 through SL2-16 PSL2 SGB Distribution of TubeSheet Indications Number of Indications 0 2 4 6 8 10 12 14 16 0.50 0.45 0.40 0.35 0.30 0.25 0.20 U) 0.15 0.10 0 0.05 0.00

-0.05

.62

-0.10

-0.15 4-

-0.20 0 -0.25

-0.30 4- -0.35

-0.40

-0.45

-0.50

-5.00

-10.00

-15.00

-20.00

-21.50 (TTS - Top of Tubesheet)