PNP 2018-057, 45-Year Containment Tendon Surveillance Summary Report
| ML18331A338 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 11/27/2018 |
| From: | Hardy J Entergy Nuclear Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| PNP 2018-057 | |
| Download: ML18331A338 (12) | |
Text
- -Enlergy PNP 2018-057 November 27,2018 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Entergy Nuclear Operations, Inc.
Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, MI 49043 Tel 269 764 2000 Jeffery A. Hardy Regulatory Assurance Manager Tech Spec 5.6.7
SUBJECT:
45-Year Containment Tendon Surveillance Summary Report Palisades Nuclear Plant Docket 50-255 License No. DPR-20
Dear Sir or Madam:
Entergy Nuclear Operations, Inc. has recently completed the subject surveillance for the Palisades Nuclear Plant (PNP). The inservice inspection summary report for the 5-year tendon surveillance is attached. The summary report is prepared in accordance with ASME Section XI, 2004 Edition, no Addenda, and 10 CFR 50.55a(b)(2)(viii).
The summary report is being submitted in accordance with PNP Technical Specification Administrative Controls section 5.6.7, which requires submittal of a report within 90 days after completion of the tests. Surveillance testing activities were completed on August 31,2018.
The 45-year Tendon Surveillance Summary Report is provided in Attachment 1.
Should you have any questions concerning this report, please contact Mr. Jeffery Hardy, Regulatory Assurance Manager, at (269) 764-2011.
Sincerely, 9A~a JAH/bed
Attachment:
45-Year Containment Tendon Surveillance Summary Report CC Administrator, Region III, USNRC Project Manager, Palisades, USNRC Resident Inspector, Palisades, USNRC
ENCLOSURE 1 PALISADES NUCLEAR PLANT ASME SECTION XI, IWL 4S-YEAR TENDON SURVEILLANCE
SUMMARY
REPORT 2018 CONTAINMENT STRUCTURAL INTEGRITY SURVEILLANCE PROGRAM, INSERVICE INSPECTION
SUMMARY
Submitted in accordance with American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Plant Components," Article IWA-6000, "Reports and Records," 2004 Edition, No Addenda
- 1.
Date:
- 2.
Company Headquarters:
- 3.
Plant:
- 4.
Unit No:
- 5.
Commercial Service Date:
- 6.
Major Component Inspected:
July 25,2018 through August 31,2018 Entergy Nuclear Operations, Inc.
1340 Echelon Parkway Jackson, Mississippi 39213 Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, Michigan 49043 One December 31, 1971 Component Manufacturer Equipment Number Post-tensioning System Bechtel
- 7.
Completion Date of Examination:
- 8.
Authorized Inspection Agency:
N-54A August 31,2018 Hartford Steam Boiler of Connecticut Hartford, Connecticut Page 1 of 11
1.0 PURPOSE Entergy Nuclear Operations, Inc (ENO) has completed inspection/examination activities and is providing this summary report of examinations, inspections and corrective actions related to the 45-year containment tendon surveillance. The surveillance program is required by Palisades Nuclear Plant (PNP) Technical Specification (TS) 5.5.5, "Containment Structural Integrity Surveillance Program."
All activities were performed in accordance with ASME Section XI, Subsection IWL, "Requirements for Class CC Concrete Components of Light-Water Cooled Plants," 2004 Edition, No Addenda, as modified by 10 CFR 50.55a(b)(2)(viii).
This report is submitted in accordance with TS 5.6.7, "Containment Structural Integrity Surveillance Report," within 90 days after completion of the inspection.
The 45-year tendon surveillance inspection/examination activities were completed August 31,2018.
2.0 EXAMINATION AND INSPECTION SCOPE The examination and inspection scope for the 45-year tendon surveillance is summarized in the following table:
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2.1 EXAMINATION CATEGORY L-B, UNBONDED POST-TENSIONING SYSTEM Cat. L-8 Item L2.10 ASME Section XI Table 2500-1 Examination Item Parts Examined Examination Examination Acceptance Comments/results Category Number Requirement Standard Oome Tendons 02-03 (Common)
L-B L2.10 01-28 Tendon IWL-2522 IWL-3220 Satisfactory 02-51 03-54 Vertical Tendons V-334 (Common)
L-B L2.10 V-24 Tendon IWL-2522 IWL-3220 Satisfactory V-94 V-238 V-276 Horizontal Tendons L-B L2.10 H-420F (Common)
H-23AE Tendon IWL-2522 IWL-3220 Satisfactory H-53BO H-71BO H-63BF Cat. L-8 Item L2.20 Tendons L-B L2.20 03-54 Wire or Strand IWL-2523 IWL-3220 Satisfactory H-53BO V-24 Page 3 of 11
2.1 EXAMINATION CATEGORY L-B, UN BONDED POST-TENSIONING SYSTEM (Continued)
Cat. L-8 Item L2.30 Examination Item Parts Examined Examination Examination Acceptance Comments Category Number Requirement Standard Dome Tendons 02-03 Anchorage Hardware and Detailed IWL-3220 Satisfactory L-B L2.30 01-28 Visual 02-51 Surrounding Concrete (VT-1) 03-54 Vertical Tendons V-334 Detailed L-B L2.30 V-24 Anchorage Hardware and Visual IWL-3220 Satisfactory V-94 Surrounding Concrete (VT-1)
V-238 V-276 Horizontal Tendons H-42DF Detailed L-B L2.30 H-23AE Anchorage Hardware and Visual IWL-3220 Satisfactory H-53BD Surrounding Concrete (VT-1 )
H-71BD H-63BF Page 4 of 11
2.1 EXAMINATION CATEGORY L-B, UNBONDED POST-TENSIONING SYSTEM (Continued)
Cat. L-8 Item L2.40 Examination Item Parts Examined Examination Examination Acceptance Comments Category Number Requirement Standard 02-03 Satisfactory - 2.35% Duct Volume Grease Replaced 01-28 Satisfactory - 6.23% Duct Volume Grease Replaced L-B L2.40 02-51 Corrosion Protection IWL-2525 IWL-3220 Satisfactory - 2.91 % Duct Medium Volume Grease Replaced 03-54 Satisfactory - 5.79% Duct Volume Grease Replaced 02-40 Satisfactory - 9.30% Duct Volume Grease Replaced V-334 Satisfactory - 0.56% Duct Volume Grease Replaced 68.76% Duct Volume V-24 Grease Replaced. CR-PLP-2018-04302. Refer to Section 3.3 for conclusion.
V-94 Satisfactory - 0.60% Duct Volume Grease Replaced V-238 Corrosion Protection IWL-2525 IWL-3220 Satisfactory - 9.01 % Duct L-B L2.40 Medium Volume Grease Replaced 18.08% Duct Volume V-276 Grease Replaced. CR-PLP-2018-04305. Refer to Section 3.3 for conclusion.
47.64% Duct Volume V-20 Grease Replaced. CR-PLP-2018-04301. Refer to Section 3.3 for conclusion.
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Cat. L-B Item L2.40 (Continued)
Examination Item Examination Acceptance Category Number Parts Examined Examination Comments Requirement Standard 10.15% Duct Volume V-176 Grease Replaced. CR-PLP-2018-04303. Refer to Section 3.3 for conclusion.
V-282 L-B L2.40 Corrosion Protection IWL-2525 IWL-3220 Satisfactory - 6.55% Duct Medium Volume Grease Replaced 16.24% Duct Volume V-306 Grease Replaced. CR-PLP-2018-04306. Refer to Section 3.3 for conclusion.
H-42DF Satisfactory - 4.86% Duct Volume Grease Replaced H-23AE Satisfactory - 5.91 % Duct Volume Grease Replaced H-53BD Satisfactory - 5.54% Duct Volume Grease Replaced L-B L2.40 H-71BD Corrosion Protection IWL-2525 IWL-3220 Satisfactory - 4.18% Duct Medium Volume Grease Replaced H-63BF Satisfactory - 4.86% Duct Volume Grease Replaced H-46AC Satisfactory - 2.43% Duct Volume Grease Replaced H-71AC Satisfactory - 2.43% Duct Volume Grease Replaced Page 6 of 11
2.1 EXAMINATION CATEGORY L-B, UN BONDED POST-TENSIONING SYSTEM (Continued)
Cat. L-8 Item L2.S0 Examination Item Parts Examined Examination Examination Acceptance Comments Category Number Requirement Standard 01-28 Satisfactory 6 Oz Water Shop End, 14 Oz 02-03 Water Field End. CR-PLP-2018-04295. Refer to Section 3.1 for conclusion.
L-B L2.50 02-51 Free Water IWL-2525 IWL-3220 Satisfactory 22 Oz Water Shop End. CR-03-54 PLP-2018-04298. Refer to Section 3.1 for conclusion.
02-40 (Field End)
Satisfactory 32 Oz Water Field End. CR-V-24 PLP-2018-04302. Refer to Section 3.1 V-94 Satisfactory V-238 Satisfactory V-276 Satisfactory V-334 Satisfactory L-B L2.50 Free Water IWL-2525 IWL-3220 6 Oz Water Field End. CR-V-20 (Field End)
PLP-2018-04301. Refer to Section 3.1 for conclusion.
1.5 Oz Water Field End. CR-V-176 (Field End)
PLP-2018-04303. Refer to Section 3.1 for conclusion.
V-282 (Field End)
Satisfactory V-306 (Field End)
Satisfactory H-46AC (Shop End)
Satisfactory H-71AC (Shop End)
Satisfactory H-23AE Satisfactory L-B L2.50 H-53BO H-71BO Free Water IWL-2525 IWL-3220 Satisfactory Satisfactory H-63BF Satisfactory H-420F Satisfactory Page 7 of 11
3.0 EXAMINATION AND INSPECTION RESULTS AND CORRECTIVE ACTIONS 3.1 The following items did not meet the acceptance criteria of ASME Section XIIWL-3221.3(e), which states, "There is no evidence of free water."
Free water was discovered in the following tendons and documented in the condition reports listed in the table below. The water sample lab pH test results are also listed below:
Tendon Water CR Sample pH Comments 02-03 6 Oz. Shop End CR-PLP-2018-Shop = 8.93 Lift off Test per IWL-(SE) 04295 Field = 8.30 2522 performed.
14 Oz. Field End (NE) 03-54 22 Oz. Shop End CR-PLP-2018-8.39 Lift off Test per IWL-(East) 04298 2522 and strand examined per IWL 2523.
V-24 32 Oz. Field End CR-PLP-2018-8.93 Lift off Test per IWL-(Bottom) 04302 2522 and strand examined per IWL-2523.
V-20 6 Oz Field End CR-PLP-2018-8.97 Replacement of end (Bottom) 04301 cap gasket was completed.
V-176 1.5 Oz. Field End CR-PLP-2018-7.86 Replacement of end (Bottom) 04303 cap gasket was completed.
The cause of water infiltration has been attributed to degraded grease can gaskets, condensation, migration through concrete cold joints, and/or tendon sheathing. The cold joint and tendon grease sheathing are generally not water tight, and can allow water infiltration when sufficient void space exists. There is no applicability to other plants on site.
The anchorage hardware, bearing plate, and nearby concrete were visually inspected at all of the locations listed above. No adverse issues were found.
The corrosion medium was noted as remaining, coating the metal hardware at all locations. Any grease loss from cap removal was replaced and a new end cap gasket was installed. The grease forms a protective coating for tendons and associated components. This function has not been compromised by the presence of water.
In addition, tendons 02-03, 03-54, and V-24 were successfully tested for force and elongation per IWL-2522. Tendons 03-54 and V-24 were de-tensioned and a single strand was removed and examined per IWL-2523. No corrosion was noted on the removed tendon strands.
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As required by 10 CFR 50.55a(b)(2)(viii)(E), ENO has considered the possibility that this condition may exist in inaccessible areas. Based on the results of inspections and tests, it is concluded that the water in tendons 02-03 and 03-54 may be due to their location and the existence of cold joints near the tendon end anchorage. In the case of tendons V-20, V-24, and V-176, it was concluded that the water intrusion may be due to the degraded end cap gaskets on the top end of the containment building.
Even if this condition exists in inaccessible areas, it is expected that tendons would meet performance requirements in a similar manner to that documented for accessible areas. This is based on visual examinations where no absence of grease on the tendons was noted. As stated above in this section, the grease forms a protective coating for tendons and associated components and this function has not been compromised by the presence of water.
As a result, no repair/replacement activities were warranted. Hence, no additional examinations are required.
3.2 The following items did not meet the acceptance criteria of ASME Section XI IWL-3221.4, which states, "Corrosion protection medium is acceptable when the reserve alkalinity, water content, and soluble ion concentrations of all samples are with the limits specified in Table IWL-2525-1." The acceptance criteria for water content in the corrosion medium provided in Table IWL-2525-1 is 10%
maximum. As documented in condition report CR-PLP-2018-04976, during the analysis of the grease for tendon V-24, the corrosion protection medium water content was 16%.
As required by 10 CFR 50.55a(b)(2)(viii)(E), ENO has considered the possibility that this condition may exist in the inaccessible areas. However, based on the results of inspections/examination and tests, it was concluded that the corrosion protection medium water content in tendon V-24 was due to the observed degraded end cap gasket at its anchorage on top of the containment building.
The corrosion protection medium water content in tendon V-24 could also have been caused by its location and the existence of a horizontal cold joint near this tendon, water migration through the concrete, or from condensation. The cold joint and tendon grease sheathing are not water tight, and can allow water intrusion when sufficient void space exists. Even if this condition exists in inaccessible areas, it is expected that the affected tendons would meet performance requirements in a similar manner to that documented for accessible areas. This is based on visual examinations, where no absence of grease on the tendons was noted. As stated above in this section, the grease forms a protective coating for tendons and associated components and this function has not been compromised by the presence of water.
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As a result of this evaluation, no repair/replacement activities were required; consequently, no additional examinations were required.
3.3 The following items did not meet the acceptance criteria of ASME Section XI IWL-3221.4, which states, "The absolute difference between the amount removed and the amount replaced shall not exceed 10% of the tendon net duct volume." The table below summarizes the tendons where the amount of grease replaced exceeded 10% of the tendon net duct volume.
Tendon Percent (%)
Condition Report Gasket Comments Replacement (CR)
Replaced V-24 68.76%
CR-PLP-2018-04302 Dome (Shop Gasket was End) &
observed flattened Bottom (Field causing metal to End) metal contact with bearing plate and cap. Previously reported as leaking.
Gasket was replaced V-276 18.08%
CR-PLP-2018-04305 Dome (Shop Previously reported End) &
as leaking. Gasket Bottom (Field was replaced.
End)
V-20 47.64%
CR-PLP-2018-04301 Bottom (Field Previously reported End) as leaking. Gasket was replaced V-176 10.15%
CR-PLP-2018-04303 Bottom (Field Previously reported End) as leaking. Gasket was replaced.
V-306 16.24%
CR-PLP-2018-04306 Bottom (Field Previously reported End) as leaking. Gasket was replaced.
Tendon end cap leakage was previously identified and end cap elastomeric component replacement was performed during the 45-year tendon surveillance with work order number 00416108.
Previous evaluation of these types of leaks has been attributed to grease filling techniques and subsequent heating of the grease by the sun and containment internal heat. Degradation of elastomeric components may also be caused by exposure to the sun. The tendons with end cap gasket replacements were inspected at the affected end for grease coating and free water with acceptable results. The tendons were refilled with grease and had acceptable grease replacement versus grease loss ratios. The leakage was not considered significant; hence, had no impact on the operability of the containment or the containment post tensioning system. Grease forms a protective coating for tendons and associated components and this function was not compromised by the amount of leakage noted in the above table in this section.
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As required by 10 CFR 50.55a(b)(2)(viii)(E), ENO has considered the possibility that this condition may exist in inaccessible areas. Based on the results of inspections, it is concluded that the level of leakage in inaccessible areas could be the same as accessible areas. However, even if this condition exists in inaccessible areas, it is expected that tendons would meet performance requirements in a similar manner to that documented for accessible areas. This is based on visual examinations, where no absence of grease on the tendons was noted. As stated above in this section, the grease forms a protective coating for tendons and associated components and this function has not been compromised by the presence of water.
As a result of the evaluation, no repair/replacement activities were required; consequently, no additional examinations were required.
4.0
SUMMARY
The TS 5.5.5, "Containment Structural Integrity Surveillance Program,"
demonstrates continued containment operability by providing assurance that the containment is capable of fulfilling designed operating and accident functions.
Based on an evaluation of the 45-year tendon surveillance results, and after reviewing the acceptable disposition of non-conforming items, ENO concludes that the containment structure has not experienced abnormal degradation related to the post-tensioning system and continues to be operable.
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