L-2016-178, Submittal of Cycle 29 Refueling Outage Steam Generator Tube Inspection Report
| ML16298A391 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/18/2016 |
| From: | Summers T Florida Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-2016-178 | |
| Download: ML16298A391 (25) | |
Text
U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-00001 Re:
Turkey Point Unit 4 Docket No. 50-251 Steam Generator Tube Inspection Report OCT 1 8 2016 L-2016-178 10 CFR 50.36 The attached Turkey Point Unit 4 Cycle 29 Refueling Outage Steam Generator Tube Inspection Report is submitted in accordance with Turkey Point Technical Specification, 6.9.1.8 and within 180 days after the initial entry to MODE 4 following completion of the inspections performed in accordance with Technical Specification 6.8.4.j, Steam Generator (SG) Program.
Should there be any questions, please contact Mr. Mitch Guth, Licensing Manager, at (305) 246-6698.
Sincerely,
?--l ~...__---
Thomas Summers Site Vice President Turkey Point Nuclear Plant Attachments cc:
Regional Administrator, Region II, USNRC.
Senior Resident Inspector, USNRC, Turkey Point Plant Florida Power & Light Company 9760 SW 344 St Homestead, FL 33035
=
Background===
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 1of14 This report is provided in accordance with Turkey Point Unit 4 Technical Specification Section 6.9.1.8, "Steam Generator Tube Inspection Report" for the inspection conducted in April, 2016 during refueling outage twenty-nine (TP4-29). The TP4-29 outage designator is also commonly referred to as EOC-28 (End of the 28th Fuel Cycle).
The TP4-29 inspection was the first inspection (and also the first Refueling Outage) in the 4th Inspection Period. The 4th inspection period length is 72 Effective Full Power Months (EFPM) in accordance with Turkey Point Unit 4 Technical Specification Section 6.8.4.j.d.2.c.
Turkey Point Unit 4 contains three (3) Westinghouse Model 44F steam generators (SGs), which were installed in 1982/83 to replace the original Unit 4 SGs.
The hot leg operating temperature (T-Hot) of Turkey Point Unit 4 is currently -61 O degrees F.
Following the TP4-29 refueling outage, Turkey Point Unit 4 initially entered HOT SHUTDOWN (Mode
- 4) on April 23, 2016, which marked the beginning of Cycle 29 (CY-29). Pursuant to Turkey Point Unit 4 Technical Specification 6.9.1.8, this Steam Generator Tube Inspection Report is required to be submitted to the NRC within 180 days after initial entry into Mode 4.
Turkey Point Technical Specification Section 6.8.4.j.d.2.c contains the fourth inspection period requirements and requires that 100% of the tubes be inspected every 72 effective full power months (for this and all subsequent inspection periods). For the current inspection period of 72 EFPM, the completed and planned inspections for Turkey Point Unit 4 (for the current inspection period of 72 EFPM) are shown below:
TP4-29 in 2016 (SG Inspection completed.in April, 2016)
TP4-30 in 2017 (SG inspection skip, no inspections planned)
TP4-31 in 2019 (Planned SG Inspection)
TP4-32 in 2020 (SG inspection skip, no inspections planned)
Implementation of TSTF-510 (Reference 1) was approved by License Amendments 255 and 251 (Reference 2) on Nov. 6, 2012, and incorporated into the Turkey Point technical specifications to make changes to the sections pertaining to SG tube integrity, the SG program (inspection frequency),
and the SG tube inspection report.
The inspection at TP4-29 in 2016 was the first inspection of the fourth inspection period (72 EFPM ).
The completed inspection at TP4-29 satisfied the condition monitoring criteria of the Turkey Point Plant Technical Specifications. The previous inspection of the Unit 4 SG tubing was completed during the TP4-27 refueling outage in 2012. The cycle lengths for Cycle 27 and Cycle 28 were 1.36 EFPY and 1.39 EFPY, respectively. At the completion of Cycle 28 (CY-28), the Unit 4 replacement SGs have accumulated 25.80 Effective Full Power Years (EFPY) of operation. At the completion of Cycle 28, the Unit 4 SGs have operated for 1.14 EFPY in the fourth inspection period (72 EFPM).
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 2of14 The next planned refueling outage for Unit 4 is during TP4-30 in Fall, 2017, which will be a skip outage for SG primary side and secondary side inspections. The next scheduled SG inspections will be during TP4-31 in Spring, 2019. That inspection will be the second inspection in the 4th ISi period (72 EFPM).
The examination performed during TP4-29 met the requirements of the following:
Technical Specification 6.8.4.j "Steam Generator (SG) Program" Steam Generator Management Program: Pressurized Water Reactor Steam Generator Examination Guidelines: Revision 7. EPRI, Palo Alto, CA. 2007 TR-1013706.
EPRI Report 1019038, Steam Generator Management Program (SGMP): Steam Generator Integrity Assessment Guidelines, Revision 3, November, 2009 The TP4-29 inspection scope and plan were based on the Degradation Assessment that was prepared prior to the inspection.
Steam Generator Tube Inspection Report Note: The previous SG Tube Inspection Report from TP4-27 is available under NRC Adams Accession # ML13277A358 (Reference 4). Subsequent NRC RAl's (and Nextera Responses) for the TP4-27 report are available under NRC Adams Accession# ML14069A083 (Reference 5).
Following is the Steam Generator Tube Inspection Report for TP4-29:
Each applicable reporting requirement of TS 6.9.1.8 is addressed below in items "a" through "j" for the TP4-29 inspection in 2016.
- a. The scope of inspections performed on each steam generator (All three SGs were examined during TP4-29).
The inspection program for the Unit 4 Steam Generators consisted of:
Bobbin Probe
- 100% full length in rows 3 and higher. Row 1 & 2 examinations limited to the hot leg (HL) and cold leg (CL) straight sections.
+Point' Probe
- 50% of the hot leg (HL) tubesheet to the extent of TSH +3.00" to TSH-18.11 ".
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 3of14 Note 1: TSH-18.11" is the approved H* depth, however, data was recorded from TSH +3.00" down through the HL tube end for ease of data acquisition.
Note 2: This inspection scope included at least 50% of the bulges (BLG) and over-expansions (OXP) in the HL tubesheet down to the H* depth.
- All HL and CL Periphery Expansion Transitions: +3"/-2" from top of tubesheet. "Periphery" Tubes are defined as the two outer-most peripheral tubes exposed to the annulus, and all open row 1 and 2 tubes in columns 1-92.
- 50% of Rows 1 and 2 tight radius u-bends
- 50% of hot leg freespan dings/dents > 5 volts between TSH and 06H + 1.00
- 50% of dings/dents in U-bends 0::2 volts
- 50% of dings/dents at HL tube support structures 0::2 volts
- 100% of potential high residual stress (2-sigma signature tubes), at the hot leg tubesheet to the extent of TSH +3.00 to TEH.
- 25% of potential high residual stress (2-sigma signature tubes), at TSP & FOB intersections (all HL, and top TSP on CL side).
- All tubes adjacent to previously reported foreign objects using the rotating +Point' probe.
- Diagnostic rotating probe examinations (Special Interest, SI) as required based on the results of the bobbin coil.
- Selected wear indications were profiled with line-by-line sizing to provide additional information for Condition Monitoring (CM) and Operational Assessment (OA) purposes.
Plug Visual Inspection
- Visual inspection in each SG of all installed tube plugs.
Prior to starting the eddy current examination at TP4-29, all of the previously installed hot-leg and cold-leg plugs in all three steam generators were confirmed to be present in their correct locations and were confirmed to be free from degradation and visible signs of leakage based on the visual examination.
Primary Side Inspections to address Westinghouse NSAL 12-01
- Visual inspection in each SG of the channel heads in response to NSAL 12-1 "Steam Generator Channel Head Degradation" January 5, 2012 (Reference 6).
The channel head bowls of the 4A, 48, and 4C steam generators were visually scanned to address the Westinghouse NSAL 12-01 letter; no anomalies were observed in any of the three SG channel heads.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Secondary Side Cleaning and Inspections The following secondary side work was performed in all three steam generators:
- Upper Bundle Flush
- Sludge Lance
- Foreign Object Search and Retrieval (FOSAR)
L-2016-178 Page 4of14 The UBF and sludge lancing processes resulted in the removal of the following amounts of sludge:
- 50.5 lbs of sludge from SG 4A
- 43.0 lbs of sludge from SG 4B
- 31.5 lbs of sludge from SG 4C.
Post sludge lancing FOSAR was performed in all three steam generators.
One (1) newly-identified foreign object was reported during FOSAR in SG 4C, and that object was retrieved.
There was no degradation associated with the retrieved foreign object. In addition to the FOSAR, primary side eddy current inspections using the rotating +Point' coil were performed on all periphery tubes at the top-of-tubesheet locations (in the hot leg and cold leg of all three SGs).
Several historical foreign objects (including sludge scale or hardened sludge fragments) are tracked at each inspection. All foreign objects remaining in the SGs are being tracked, and foreign object evaluations have been completed for those remaining foreign objects.
The integrity of the steam generators until the next scheduled inspection is not affected by the foreign object that remain in the SGs.
Foreign objects removed from the steam generators during FOSAR examinations are entered into the plant's Corrective Action Program (CAP) for tracking.
Upper Steam Drum Inspections were also performed in two SGs (SG 4A and 4C). The upper internal components inspected included primary separators, secondary separator perforated plates, drain pipes, feedring J-Nozzles and general areas. Ultrasonic thickness measurements were also taken at a sample of locations on the SG 4A feedring T-Box and J-Tubes, and on the SG 4C feedring T-Box. No abnormalities were noted during the upper steam drum inspection in SG 4A or4C.
An in-bundle tube support visual inspection was also performed in SG 4A, at the top three support structures (04H, 05H, and 06H Broached Tube Support Plates). The inspection included views of the open tube lane and broached tube support openings in both hot and cold legs. The inspection revealed no abnormal conditions or fouling of the areas observed.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report
- b.
Degradation mechanisms found L-2016-178 Page 5of14 The TP4-29 examination results for Turkey Point Unit 4 identified mechanical wear at the following locations:
Anti-vibration bars Broached tube support plates Hot Leg Baffle Plates (FDBs)
One location (related to foreign object) above 01 H Broached Tube Support Plate In addition to the wear degradation discussed above, there was one (1) previously reported axial indication reported in SG 4B near the HL tube-end (which is below the H* depth of TTS-18.11 "). On November 5th, 2012, the NRC approved License Amendments (Ref. 3) regarding permanent alternate repair criteria for service-induced degradation detected in the tubesheet region.
Reference 3 states:
"Tubes with service-induced flaws located greater than 18.11 inches below the top of the tubesheet do riot require plugging". Therefore, the tube with the indication below the H* region remained in service.
Since the axial indication was below the H* depth, it was reported as "AOB", which is an acronym for "Axial Indication Outside (H*) Boundary".
Note: During TP4-27 in 2012, there were eleven (11) axial indications reported as "AOB" below the H* depth, near the HL tube ends. The reason only one (1) "AOB" indication was re-reported during TP4-29 is because the locations of the other ten (10) previously reported "AOB" indications were not planned for inspection during TP4-29.
There were no indications of corrosion-related tube degradation detected above the H* depth during the TP4-29 inspection.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 6of14
- c.
Nondestructive examination techniques utilized for each degradation mechanism Table 1 Turkey Point Unit 4 Examination Techniques for TP4-29 Industry Type of Demonstrated Extended Was the Technique Used Technique Qualification Degradation Applicability Applicability for Sizing during TP4-29?
(ETSS)
Tube Supports 1
Bobbin 96004.1 Wear (TSPs), Anti-None Yes. Used to size AVB Wear Revision 13 Vibration Bars for service.
(AVBs)
Tube Supports 2
Bobbin 96004.2 Wear (TSPs), Anti-None No Revision 13 Vibration Bars (AVBs)
. 96005.2 Freespan in the Detection of 3
Bobbin Revision 9 Pitting Presence of Pitting in Sludge No Copper Pile 4
Bobbin 24013.1 Axial ODSCC Freespan Dings None No Revision 2
.:=_5.00 Volts 1-28411 Drilled TSP 5
Bobbin Axial ODSCC With or w/o Dents None No Revision 3
< 2 volts 1-28412 Freespan 6
Bobbin Revision 3 Axial ODSCC with or w/o Dents s None No 2 volts Freespan, Sludge 1-28413
- Pile, 7
Bobbin Revision 3 Axial ODSCC Broached TSP with None No orw/o Dents < 2 volts Foreign Object Detection of Foreign Object 8
Bobbin 27091.2 Foreign Object Wear Wear No Revision 2 Wear (with Foreign (with Foreign Object not present)
Object present) 9
+Point' 96511.1/.2 Axial/Ci re Low Row U-bend None No Revision 16 PWSCC Detection of Circ PWSCC at Dent, 111524 Expansion Dings, Non-10
+Point' Revision O CircPWSCC Transition Dented Support No Structures, Sludge Pile, Tubesheet Detection of Axial PWSCC at Non-11
+Point' 20511.1 Axial PWSCC Expansion Dented Support No Revision 8 Transition Structures, Sludge Pile, Tubesheet
Technique 12
+Point' 13
+Point' 14
+Point'
\\
15
+Point' 16
+Point' 17
+Point'
)
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Table 1 L-2016-178 Page 7of14 Turkey Point Unit 4 Examination Techniques for TP4-29 continued Industry Type of Demonstrated Extended Technique Used for-Qualification Degradation Applicability Applicability Sizing during TP4-29?
(ETSS)
Detection of Axial PWSCC at Non-96703.1 Axial PWSCC Dent/Ding Dented Support No Revision 17 Structures, Tubesheet, Sludqe Pile Detection of Axial ODSCC at 22401.1 Dented Support Tubesheet, Revision 4 Axial ODSCC Structures Expansion No
> 2.0 volts Transition, Freespan, Dents,
- Dings, Detection and Sizing of Wear at Yes 96910.1 Flow Baffle Plate, Used to size Broached TSP Revision 10 Wear Broached TSP Foreign Object Wear and Flow Baffle Plate Wear w/ Foreign Object still Wear for Service.
present 21998.1 Volumetric Freespan None No Revision 4 Detection of Circ ODSCC at TSP, 21410.1 CircODSCC Expansion Freespan, Sludge No Revision 6 Transition Pile, Tubesheet, Dents, Dings, U-bend Freespan Yes Volumetric 27904.1, was used to size a Degradation Morphology foreign object wear near the 27901.1 Rev. 1 Foreign Object Dependent with upper edge of a Broached 27902.1 Rev. 2 TSP (Row 17, Col 71 in 27903. 1 Rev. 1 Wear Shape Loose Part SG4B). (The tube was 27904. 1 Rev. 2 Wear Morphology
- Present, plugged).
27905. 1 Rev. 2 Dependent Possible Loose 27906. 1 Rev. 1 (with Foreign Parts 27905.1, was used to size 27907.1 Rev. 2 Object not present) and TSP wear wear above the upper edge of above and below the a broached TSP edge. (Row support edges 5, Col 86 in SG4B).
(freespan)
Technique 18
+Point' 19
+Point' 20
+Point' 21
+Point' 22
+Point' 23
+Point' 24
+PoinF" Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Table 1 Turkey Point Unit 4 Examination Techniques for TP4-29 continued Industry Type of Demonstrated Extended Qualification Degradation Applicability Applicability (ETSS) 1-28424 Sludge Pile, Drilled Revision 3 Axial ODSCC TSP with or w/o None dents <2.0 volts 1-28425
- Freespan, Revision 3 Axial ODSCC Broached TSP w/o None Dents <2.0 volts Sizing - Sludge Pile 1-28431 and Drilled Revision 2 Axial ODSCC TSP with or w/o None Dentsg volts Sizing - Freespan, 1-28432 Axial ODSCC Broached None Revision 2 TSP with or w/o Dents <2 volts Support Structures, Detection of Axial 21409.1 Axial ODSCC Freespan Region, ODSCC at Revision 7 Sludge Pile and Expansion Tubesheet Crevice Transitions 10411.1/2 Detection of Axial Axial ODSCC U-bend Rows 3-5 ODSCC in all Revision 0 ubends L-2016-178 Page 8of14 Technique Used for Sizing during TP4-29?
No No No No No No 10908.4 Wear Anti-Vibration Bars None Yes, used to profile selected Revision 1 (AVBs)
AVB wear indications
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 9of14
- d.
Location, orientation (if linear) and measured sizes (if available) of service induced indications Attachments 2, 3, and 4 contain the indication listings for SG 4A, 48 and 4C respectively.
Note: For AVB wear, the listings provide the depth as measured by the. bobbin probe.
For all other wear locations, the listings provide the depth as measured by the +Point' probe.
- e.
Number of tubes plugged during the inspection outage for each degradation mechanism Table 2 Turkey Point Unit 4 Tube Plugging TP4-29 Reason for Pluaaina SG4A SG4B SG4C Total
- 1) Wear attributed to foreign object above 01 H Broached tube support 0
1 0
1 plate
- 2) Preventatively plugged for wear at 0
1 0
1 an anti-vibration bar (AVB) location Total 0
2 0
2 Note: Item 1 in the Table 2 above was reported in SG BI R17 C71 and required plugging per Plant Technical Specifications. Item 2 in Table 2 above was reported in SG BI R35 C54 and was plugged preventatively (plugging was not required per Plant Technical Specifications).
- f.
The number and percentage of tubes plugged to date, and the effective plugging percentage in each steam generator No tube repair methods (i.e. sleeving) are approved for Turkey Point Unit 4 that would have an effect on the effective plugging percentages. Therefore, the applicable effective plugging percentage is synonymous with the % Plugged in Table 3 below:
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Table 3 Turkey Point Unit 4 Steam Generator Cumulative Tube Pluaaina Summary TP4-29 SG
- Pluaaed
% Pluaaed 4A 33 1.03%
48 23 0.72%
4C 11 0.34%
L-2016-178 Page 10of14
- g.
The results of condition monitoring, including the results of tube pulls and in-situ testing All tubes satisfied the structural integrity and accident-induced leakage performance' criteria based on the condition monitoring (CM) evaluation performed at the TP4-29 inspection. No tubes required in-situ pressure testing for either tube burst or leakage. Therefore, all tubes met the structural and leakage integrity requirements of the Turkey Point Technical Specifications.
No tube pulls were required.
Discussion on AV8 Wear Tube wear at AV8s has been the dominant mode of degradation for the Unit 4 steam generators. During TP4-29, the Technical Specification wear repair limit of ;::40% TW depth was applied, however, no AV8 wear ;::40% TW was reported at AV8 locations during TP4-29. One tube (R35 C54 in SIG 48) was preventatively plugged because the detected AV8 wear indications reported during TP4-29 exhibited a large depth change since the last inspection at TP4-27.
During TP4-29, newly detected indications at AV8 3 and AV8 4 were measured as 24% and 31%TW, respectively. Those two locations had no detectable degradation reported during the TP4-27 inspection.
A total of 80 wear indications at AV8 locations were detected and evaluated: 23 in S/G 4A, 30 in S/G 48, and 27 in S/G 4C. Eighteen AV8 wear indications were newly detected at this inspection: 7 in SG 4A, 10 in S/G 48, and 1 in S/G 4C. The others were wear indications detected in prior inspections, and were allowed to remain in service based on repair-on-sizing strategy acceptance and monitored for growth.
All detected AV8 wear indication sizes fell below the condition monitoring limits for both the burst and leakage requirements. Therefore, the AV8 wear indications met the CM requirements in NEI 97-06 for burst and leak integrity.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Discussion on Broached TSP Wear L-2016-178 Page 11of14 There were 11 indications detected at broached TSP locations: 2 in SIG 4A, 8 in S/G 4B, and 1 in S/G 4C. Two of the TSP indications were newly detected for the TP4-29 inspection. All detected wear indications fell well below the condition monitoring limits. Therefore, the TSP wear indications met the acceptance criteria of NEI 97-06 structural performance criterion for burst and leak integrity.
Discussion on Baffle Plate Wear There were 8 indications detected at hot leg baffle plate locations: 2 in S/G 4A, 5 in S/G 4B and 1 in S/G 4C. There were no newly detected indications for the EOC 28 inspection. All detected baffle plate wear.indications fell well below the condition monitoring limits. Therefore, the baffle plate wear indications met the acceptance criteria of NEI 97-06 structural performance criterion for burst and leak integrity.
Discussion on Foreign Object Wear Indication The wear indication at the 01 H tube support structure in SG 4B (in R 17 C71) was detected with the bobbin probe and confirmed with the +Point' rotating probe. The wear indication was attributed to a foreign object because of:
The indication's proximity to a tube that was plugged in TP4-27 in 2012 for foreign object wear The indication's morphology is consistent with foreign object wear.
During the TP4-27 inspection in 2012, a possible loose part (PLP) signal was reported (in SGB, R17 C74) coincident with wear at the upper edge of 01 H. It was not possible to visually confirm the presence of a foreign object because that area was inaccessible for inspection by the Foreign Object Search and Retrieval (FOSAR) operations.
The morphology of the 2012 indication was consistent with foreign object wear. The tube at R 17 C7 4 was plugged and stabilized in 2012.
The foreign object wear indication reported during TP4-29 in 2016 occurred on the top edge of the 01 H broached tube support plate in R17 C71, just a few tubes away from the foreign object wear reported in R17 C74 in 2012. Eddy current did not detect the presence of a possible loose part (PLP) in R17 C71 during the 2016 inspection.
In addition, the location was tested during TP4-27 in 2012 with the bobbin coil, and no PLPs or degradation were reported for the tube at the R17 C71 location.
FOSAR inspectors were not able to visually confirm the presence or absence of a foreign object -
at the R17 C71 location during the 2016 inspection, due to its location in the tube bundle. The tubes surrounding R17 C71 were inspected with the +Point' coil, and no evidence of a foreign object was detected.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 12of14 The bobbin technique detected the foreign object wear in R17 C71, and the appropriate
+Point' technique (ETSS 27904.1) for the specific wear shape was used to size the indication.
The depth of the wear scar from the suspected foreign object was sized at 77%TW by +Point' with a length of 0.35 inch.
Comparison of the measured voltage and length sizes with the exemption criteria show the voltage-based screening criteria are met for both leakage and structural requirements for Tube R17 C71.
The tube located at row 17 column 71 was stabilized and plugged during the TP4-29 inspection.
- h.
The primary to secondary leakage rate observed in each SG (if it is not practical to assign the leakage to an individual SG, the entire primary to secondary leakage should be conservatively assumed to be from one SG) during the cycle preceding the inspection which is the subject of the report No primary to secondary leakage was observed during Cycles 27 and 28.
- i.
The calculated accident induced leakage rate from the portion of the tubes below 18.11 inches from the top of the tubesheet for the most limiting accident in the most limiting SG. In addition, if the calculated accident induced leakage rate *from the most limiting accident is less than 1.82 times the maximum operational primary to secondary leakage rate, the report should describe how it was determined The accident induced leakage rate from the portion of the tubes below 18.11 inches from the top of the tubesheet is calculated from any observed normal operating leakage that cannot be attributed to a source other than the tubesheet expansion region. The technical basis for this calculation is contained in the H* Alternate Repair Criteria (ARC) for the Turkey Point plant. For the operating period preceding the TP4-29 inspection, no operational primary-to-secondary leakage has been observed.
For Turkey Point Unit 4, the maximum operational primary-to-secondary leakage rate from the portion of the tubes below 18.11 inches from the top of the tubesheet is determined by multiplying any normal operating leakage by a factor of 1.82 to determine the accident induced leakage rate. This multiplying factor for leakage is based on H* Alternate Repair Criteria (ARC) methodology. Since no operational primary-to-secondary leakage has been observed, the calculated accident induced leakage rate from the portion of the tubes below 18.11 inches from the top of the tubesheet is zero.
- j.
The results of monitoring for tube axial displacement (slippage). If slippage is discovered, the implications of the discovery and corrective action shall be provided.
Monitoring of tube slippage was completed during the TP4-29 inspections.
No tube slippage was reported.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report ADDITIONAL INFORMATION The following information is included to assist the staffs review of this report.
Abbreviations and Acronyms AOB ARC AVB CL CM EPRI FOB HL ISi ISPT OA PWSCC TSP TSH TTS
%TW WAR Axial Indication Outside of Pressure Boundary Alternate Repair Criteria Anti-Vibration Bar Cold Leg Condition Monitoring Electric Power Research Institute Flow Distribution Baffle Hot Leg In-service Inspection In Situ Pressure Testing Operational Assessment Primary Water Stress Corrosion Cracking Tube Support Plate Tube Sheet Hot (Hot Leg Top of Tubesheet)
Top of Tubesheet (Percent) Through Wall Depth Mechanical Wear Outage Designators TP4-27 = EOC-26 TP4-29 = EOC-28 TP4-30 = EOC-29 TP4-31 = EOC-30 TP4-32 = EOC-31 L-2016-178 Page 13of14
References:
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report L-2016-178 Page 14 of14
- 1.
NRC Document TSTF-510, Rev 2, "Revision to Steam Generator Program Inspection Frequencies and Tube Sample Selection".
- 2.
NRC License Amendment 255 and 251, Letter dated November 6, 2012 "Turkey Point Nuclear Generating Station Unit Nos. 3 and 4 - Issuance of Amendments Regarding Adoption of TSTF 510, Revision to Steam Generator Program Inspection Frequencies and Tube Sample Selection (TAC NOS. ME9106 and ME9107)." (ADAMS Accession No. ML12297A240).
- 3.
NRC License Amendment 254 and 250, Letter dated November 5, 2012 "Turkey Point Nuclear Generating Station Unit Nos. 3 and 4 - Issuance of Amendments Regarding Permanent Alternate Repair Criteria for Steam Generator Tubes (TAC NOS. ME8515 and ME8516)." (ADAMS Accession No. ML12292A342).
- 4.
Turkey Point Unit 4 Docket No. 50-251 Steam Generator Tube Inspection Report (for TP4-27 Inspection in 2012).
(ADAMS Accession No. ML13277A358).
- 5.
Turkey Point Unit 4 Docket No. 50-251 Response to Request for Additional Information Regarding Steam Generator Tube Inspection Report (for TP4-27 Inspection in 2012).
(ADAMS Accession No. ML14069A083).
- 6.
Westinghouse Nuclear Safety Advisory Letter (NSAL) 12-01, Steam Generator Channel Head Degradation, 01/05/2012.
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report SG 4A Indication Listinas Listing Description Additional Tubes Plugged Listing During TP4-29 (No Tubes Plugged)
Bobbin WEAR (WAR) atAVB locations 20-100%TWD Bobbin WEAR (WAR) atAVB locations 1-19% TWO
+Point' WEAR (WAR) 1-100% (Broached Support Plates)
+Point' WEAR (WAR) 1-100% (H/L Baffle Plates)
Page No.
2 2
2 3
3 L-2016-178 Page 1of3 SG4A
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4A Additional Tubes Plugged Listing during TP4-29 L-2016-178 Page 2 of3 SG4A No additional tubes required plugging as a result of the inspections in Steam Generator(SG)4A.
Turkey Point Unit 4 (TP4-29)
SG4A Bobbin Wear (WAR) atAVB's 20-100%TWD ROW COL
%TW LOCATION 29 25 25 AV4 -0.11 37 65 27 AV2 +0.00 32 AV4 +0.00 Total Tubes
- 2 Total Indications: 3 Turkey Point Unit 4 (TP4-29)
SG4A Bobbin Wear (WAR) at AVB's 1-19% TWO ROW COL
%TW LOCATION 26 20 6
AVl +0.30 30 16 6
AV2 +0.00 30 30 10 AV3 -0.02 30 80 9
AV2 +0.18 31 77 12 AVl +0.27 31 80 10 AVl +0.27 32 74 12 AVl +0.05 10 AV2 +0.23 10 AV3 +0.20 32 76 10 AV4 -0.14 33 72 19 AVl +0.23 13 AV3 -0.25 33 74 9
AVl +o.11 35 67 11 AV4 -0.16 37 20 12 AVl +0.28 13 AV2 +0.28 37 65 17 AV3 +0.00 37 71 18 AV2 +o.48 12 AV3 +0.34 42 63 9
AV3 +O. 62 Total Tubes
- 15 Total Indications: 20
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4A
+Point' Wear (WAR) At Broached Supports 1-100%TWD ROW COL IND %TW LOCATION 4
58 WAR 8
02H +0.55 10 62 WAR 9
04H +0.48 Total Tubes
- 2 Total Indications: 2 Turkey Point Unit 4 (TP4-29)
SG4A
+Point' Wear (WAR) At H/L Baffle Plates 1-100%TWD ROW COL IND %TW LOCATION 13 4
WAR 11 39 28 WAR 5
Total Tubes
- 2 Total Indications: 2 BAH -0.25 BAH +0.05 L-2016-178 Page 3of3 SG4A
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report SG 48 Indication Listings Listing Description Additional Tubes Plugged During TP4-29 Bobbin WEAR (WAR) at AVB locations 20-100% TWO Bobbin WEAR (WAR) at AVB locations 1-19% TWO
+Point' WEAR (WAR) 1-100% (Broached Support Plates)
+Point' WEAR (WAR) 1-100% (H/L Baffle Plates)
+Point' WEAR (WAR) 1-100% (Wear due to Foreiqn Object)
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2 2
3 3
4 4
L-2016-178 Page 1of4 SG4B
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4B Additional Tubes Plugged During TP4-29 Two tubes (shown below) were plugged in SG 48 during TP4-29.
ROW COL Degradation Type 17 71 Foreign Object Wear 35 54 AVB Wear L-2016-178 Page 2of4 SG4B Note:
Row 17 Col 71 in SG48 required plugging because %TW depth of degradation exceeded Tech Spec Plugging criteria. Row 35 Col 54 was preventatively plugged due to AVB wear growth rate.
Turkey Point Unit 4 (TP4-29)
SG4B Bobbin Wear (WAR) at AVB's 20-100% TWO ROW COL
%TW LOCATION 27 72 22 AVl -0.11 34 46 23 AV2 -0.23 35 54 24 AV3 -0.25 26 AV3 +0.27 31 AV4 +0.27 38 58 20 AV4 -0.09 Total Tubes
- 4 Total Indications: 6
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4B Bobbin Wear (WAR) at AVB's 1-19% TWO ROW COL
%TW LOCATION
========
13 42 14 AVl -0.12 21 6
12 AV3 +0.20 23 50 12 AV3 +0.00 23 85 11 AV3 -0.11 26 64 14 AV2 +0.00 14 AV3 +0.00 26 68 10 AV3 +0.00 26 71 10 AV2 +0.20 26 83 8
AV2 +0.27 27 72 18 AV2 +0.21 27 82 13 AV4 +0.18 30 65 13 AV2 +0.14 9
AV3 +0.18 30 73 9
AV2 +0.00 13 AV3 +0.00 16 AV4 +0.00 31 13 12 AV2 +0.16 13 AV4 +0.18 33 16 13 AV4 +0.00 33 62 13 AV2 -0.23 33 78 10 AV2 +0.30 11 AVl +0.30 34 46 11 AV2 +0.70 38 58 15 AV3 +0.21 Total Tubes
- 18 Total Indications: 24 Turkey Point Unit 4 (TP4-29)
SG48
+Point' Wear (WAR) At Broached Support Plates 1-100% TWO ROW COL IND %TW LOCATION
==============
5 12 WAR 10 04H +0.40 5
86 WAR 7
OlH +0.67 9
80 WAR 4
02H +0.42 28 80 WAR 7
05H -0.50 31 60 WAR 16 02H -0.22 35 49 WAR 8
02H -0.30 40 25 WAR 6
Ole +0.32 44 38 WAR 10 Total Tubes
- 8 Total Indications: 8 04C +0.52 L-2016-178 Page 3 of 4 SG48
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4B
+Point' Wear (WAR) At H/L Baffle Plates 1-100%TWD ROW COL IND %TW LOCATION 19 86 WAR 11 BAH
-0.20 WAR 11 BAH
-0.15 35 70 WAR 9
BAH
-0.30 40 26 WAR 5
BAH
-0.20 WAR 6
BAH
+0.00 Total Tubes
- 3 Total Indications: 5 Turkey Point Unit 4 (TP4-29)
SG4B
+Point' Wear (WAR) Due to Foreign Objects 1-100%TWD ROW COL IND %TW 17 71 WAR 77 Total Tubes
- 1 Total Indications: 1 LOCATION OlH +0.68 L-2016-178 Page 4of4 SG4B
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report SG 4C Indication Listings Listing Description Additional Tubes Plugged Listing for TP4-29 (No tubes plugged)
Bobbin WEAR (WAR) atAVB locations 20-100%TWD Bobbin WEAR (WAR) atAVB locations 1-19% TWO
+Point' WEAR (WAR) 1-100% (Broached Support Plates)
+Point' WEAR (WAR) 1-100% (H/L Baffle Plates)
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2 2
2 3
3 L-2016-178 Page 1of3 SG4C
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4C Additional Tubes Plugged Listing for TP4-29 L-2016-178 Page 2 of3 SG4C No additional tubes required plugging as a result of the inspections in Steam Generator(SG)4C.
Turkey Point Unit 4 (TP4-29)
SG4C Bobbin WAR at AVB's 20-100%TWD ROW COL
%TW LOCATION 32 70 23 AVl +0.37 35 31 28 AV2 +0.30 Total Tubes
- 2 Total Indications: 2 Turkey Point Unit 4 (TP4-29)
SG4C Bobbin WAR at AVB's 1-19% TWO ROW COL
%TW LOCATION
========
12 4
9 AV4 +0.33 13 4
16 AV4 +0.37 22 7
13 AV2 +0.16 22 82 11 AVl +0.30 22 83 12 AV4 +0.00 24 12 16 AV4 -0.18 26 82 15 AVl +0.30 27 80 10 AV3 +0.25 27 81 9
AVl +0.27 9
AV4 +0.20 30 15 14 AVl +0.21 30 75 14 AV2 +0.59 31 80 8
AV3 +0.18 32 16 19 AV2 +o.21 32 70 19 AV3 +0.21 33 76 8
AVl +0.27 34 17 7
AVl +0.11 34 53 14 AV2 +0.21 9
AVl -0.21 34 75 15 AV4 -0.02 36 74 8
AV3 +0.14 37 71 8
AVl +0.37 37 73 8
AV3 -0.27 39 69 7
AV2 +0.16 40 68 6
AV2 +0.21 Total Tubes
- 23 Total Indications: 25
Turkey Point Unit 4 (TP4-29)
Steam Generator Tube Inspection Report Turkey Point Unit 4 (TP4-29)
SG4C
+Point' Wear (WAR) At Broached Supports 1-100%TWD ROW COL IND %TW LOCATION 35 75 WAR 10 06H
+0.36 Total Tubes
- 1 Total Indications: 1 Turkey Point Unit 4 (TP4-29)
SG4C
+Point' Wear (WAR) At H/L Baffle Plates 1-100%TWD ROW COL IND %TW LOCATION 28 82 WAR 7
BAH +0.45 Total Tubes
- 1 Total Indications: 1 L-2016-178 Page 3of3 SG4C