ML050770254

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PSC Precision Surveillance Corporation, 30th Year Surveillance of the Post-Tensioning System at the Three Mile Island Unit 1 Containment Building, 2004, Volume I of III
ML050770254
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 03/15/2005
From: Giometti B
AmerGen Energy Co, Exelon Corp, Precision Surveillance Corp
To:
Office of Nuclear Reactor Regulation
References
Download: ML050770254 (67)
v • d • e


Text

'-30,,fYEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM ¢

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ENGINEERING FILE NUMBER: 463 PRECISION SURVEILLANCE CORPORATION 3468 WATLING STREET EAST CHICAGO, INDIANA 46312 PHONE: (219) 397-5826 FAX: (219) 397-5867 MAIN 30t YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM TITLE: AT THE THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING TITBLE POST-TENSIONING SURVEILLANCE REPORT PREPARED BY: BRIAN GIOMETTI REVIEWED BY: PAUL C. SMITH APPROVED BY: RONALD D. HOUGH. P.E.

ENGINEERING DEPARTMENT ABSTRACT THIS REPORT PRESENTS THE FINDINGS OF THE 3 0ih YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND UNIT I CONTAINMENT BUILDING. BASED ON THE RESULTS OF THIS SURVEILLANCE, THE CONCLUSION IS REACHED THAT THE POST-TENSIONING SYSTEM HAS EXPERIENCED NO SIGNIFICANT DEGRADATION AND IS FUNCTIONING ADEQUATELY.

REVISION CONTROL LOG REVISION APPROVED REV. BY PAGES AFFECTED

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~Begven SM An Exelon Company THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING 2004 PRECISION SURVEILLANCE CORP.

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THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THEAmerGen THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING An ExelonCompany

SUMMARY

The purpose of this report is to present the results of the 30th Year Physical In-Service Tendon Inspection of the Three Mile Island Unit 1 Containment Building Post Tensioning System. The results of this investigation are discussed in detail in the body of this report and are summarized as follows:

1. The sheathing filler (grease) samples were tested and found to have acceptable levels of water soluble ions (Chlorides, Nitrates, and Sulfides) and water content. All neutralization numbers were above the IWL requirement of 2 50% of the originally installed value, and acceptable. No visible breakdown of the grease was noted either by color or consistency for all grease samples tested.
2. None of the surveillance tendons exhibited any water either during removal of the grease can, detensioning or around the tendon anchorage at any time.
3. Acceptable corrosion levels were found to all inspected anchorage assemblies, and no cracks were found on any anchorage components. Concrete cracks surrounding the bearing plates were within allowable tolerance of < 0.010".
4. Four (4) protruding buttonheads were found on the field end of V 137, but it was decided that there was no evidence of broken wires. One protruding buttonhead was found on the field end of H62-18. During the retensioning of V141, one of the buttonheads popped off while going to the overstress state. All this information is explored in more detail in the body of this report and the buttonheads are all mapped on Data Sheet 1 of Enclosure 6. No additional broken, missing or protruding wires were found on any other of the surveillance tendons.
5. The hydraulic jacks used for liftoffs, detensioning and retensioning tendons, as well as the ram used for wire testing, were found to be in a properly calibrated status throughout the surveillance.
6. The tendon liftoffs were found to be above the acceptable limits in all cases.
7. Normalized liftoffs for each group were acceptable and in excess of the minimum design forces.
8. All test wire samples were found to be acceptable for diameter and corrosion level. During testing all wire samples exceeded the acceptance criteria for yield strength, ultimate strength and elongation.

i

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND ereren,.

An

,UNIT CONTAINMENT BUILDING An Exelon Company

SUMMARY

9. All detensioned tendons were retensioned with acceptable elongations and were left at acceptable force levels. Because a substantial amount of friction was broken during the retensioning of V140, two additional tendons (V137 and V141) were detensioned and retensioned to verify acceptable stress levels.
10. All end caps were modified to meet current design standards and a new gasket was installed.
11. When refilled with sheathing filler (grease), none of the tendons took more than 4 gallons more than was removed prior to inspection. This is within acceptable limits.
12. Crack growth inspections around 9 dome tendons showed no change from the period 7 inspection.
13. When liftoff forces were compared with original lockoff values from construction the force losses were found to be within the expected range for a containment building of this age.

Based on the data gathered during the 30th Year Physical In-Service Inspection and reported herein, the conclusion is reached that no abnormal degradation of the Post Tensioning System has occurred at the Three Mile Island Unit 1 Containment Building.

ii

OF THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE UNIT THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING An Exelon Company TABLE OF CONTENTS VOLUME I

SUMMARY

......................................................................................................i TABLE OF CONTENTS ........................................................ iii LIST OF TABLES ......................................................... v SECTION 1 INTRODUCTION.............................................................................................vi SECTION 2 I. SURVEILLANCE PROCEDURES ........................................................ 1 II. SHEATHING FILLER ANALYSIS ......................................................... 2 III. ANCHORAGE COMPONENTS................................................................ 5 IV. DOME TENDON CONCRETE CRACK GROWTH ................................. 19 V. GENERAL CONTAINMENT INSPECTION ......................................... 22 VI. HYDRAULIC JACK CALIBRATIONS .................................................. 26 VII. TENDON LIFTOFFS AND DETENSIONING ......................................... 28 VIII. TENDON RETENSIONING .35 IX. WIRE INSPECTION AND TESTING .40 X. END CAP AND SHEATHING FILLER INSTALLATION. 42 XI. COMPARISON WITH ORIGINAL INSTALLATION DAA .46 SECTION 3 CONCLUSION.................................................................................................. 48 VOLUME II SECTION 4 - APPENDIX A SURVEILLANCE DATA SHEETS UNIT 1 DATA SHEETS SQ 6.0-GREASE CAP REMOVAL DATA SHEETS 9 & SQ 6.1-INSPECT FOR WATER ENCLOSURE 6, DATA SHEETS 4-BUTTONHEAD INSPECTION ENCLOSURE 6, DATA SHEETS 1,2 & 3-ANCHORAGE ASSEMBLY INSPECTION ATTACHMENT 5-TENDON ANCHORAGE VT-I EXAM ENCLOSURE 6, DATA SHEETS 5,6 & 7-ANCHORAGE CRACK INSPECTION ATTACHMENT 6-CONTAINMENT CONCRETE VISUAL EXAM ENCLOSURE 6, DATA SHEETS 8 & 9-DOME CRACK GROWTH ENCLOSURE 6, DATA SHEETS 10-GENERAL CONTAINMENT INSPECTION DATA SHEETS 8 & SQ 7.1-THREAD MEASUREMENTS DATA SHEETS 1, 2, & 3-FORCE CONFIRMATION TEST DATA SHEETS 5-NORMALIZED LIFTOFFS iii

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND addme en lbo so UNIT I CONTAINMENT BUILDING AnExelonCompany e,~.

LIST OF TABLES

1. LABORATORY ANALYSIS OF SHEATHING FILLER A. DOME TENDONS 3 B. HOOP TENDONS 3 C. VERTICAL TENDONS 4
2. GREASE CAP REMOVAL A. DOME TENDONS 8 B. HOOP TENDONS 8 C. VERTICAL TENDONS 9
3. INSPECT FOR WATER A. DOME TENDONS 10 B. HOOP TENDONS 11 C. VERTICAL TENDONS 12
4. ANCHORAGE CORROSION CONDITION A. DOME TENDONS 13 B. HOOP TENDONS 13 C. VERTICAL TENDONS 14
5. BUTTONHEAD INSPECTION A. DOME TENDONS 15 B. HOOP TENDONS 15 C. VERTICAL TENDONS 16
6. CONCRETE CONDITION AROUND BEARING PLATES A. DOME TENDONS 17 B. HOOP TENDONS 17 C. VERTICAL TENDONS 18
7. CRACK GROWTH INSPECTIONS-DOME TENDONS 21
8. HYDRAULIC JACK CALIBRATIONS 27
9. ANCHORAGE THREAD MEASUREMENTS A. DOME TENDONS 31 B. HOOP TENDONS 31 C. VERTICAL TENDONS 31 iv

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AmerGenn.

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LIST OF TABLES (Continued)

10. TENDON LIFTOFFS A. DOME TENDONS 32 B. HOOP TENDONS 33 C. VERTICAL TENDONS 33
11. NORMALIZED TENDON LIFTOFFS 34
12. TENDON RETENSIONING 36
13. ELONGATION GRAPHS 37
14. ANCHORHEAD ROTATION A. DOME TENDONS 39 B. HOOP TENDONS 39 C. VERTICAL TENDONS 39
15. WIRE INSPECTION AND TESTING 41
16. GREASE LOSS VS GREASE REPLACEMENT A. DOME TENDONS 45 B. HOOP TENDONS 45 C. VERTICAL TENDONS 45
17. COMPARISON WITH ORIGINAL INSTALLATION DATA 47 v
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THIRTIETH YEAR SURVEILLANCE in OF THE POST-TENSIONING SYSTEM AT THE fMer e THREE MILE ISLAND IZ UNIT 1 CONTAINMENT BUILDING An Exelon Company INTRODUCTION This report details the 30th Year Physical Tendon Surveillance of the Unit 1 Reactor Building Post Tensioning System at Amergen's Three Mile Island Nuclear Facility (TMI). The Reactor Building surveillance program is a systematic means of assessing the quality and structural performance of the post tensioning system. The thirtieth year tendon surveillance is the eighth in the series.

The tendon surveillance program consists of a periodic inspection of the physical condition of a previously determined group of tendons. This program provides confidence in the condition and functional capability of the system, and an opportunity for timely corrective measures if adverse conditions are detected. Physical tendon surveillance consists of sheathing filler inspection, anchorage inspection, tendon liftoff, inspection and tensile test of removed wire samples (for detensioned tendons) and tendon retensioning, with the tendons being resealed after completion of all inspections.

The 30th year tendon surveillance began on August 29th, 2004 and was completed on December 12th, 2004. The surveillance was conducted in accordance with TMI - Unit 1 RB Structural Integrity Tendon Surveillance Procedure 1301-9.1 revision 18 and PSC Surveillance Manual, a copy of these documents is included in Section 9, Appendix F of this Surveillance Report.

A group of three dome, five hoop, and four vertical tendons were selected by TMI, and one tendon out of each group was selected to be detensioned and have a test wire removed. In addition to the standard surveillance work, two additional vertical tendons were detensioned and retensioned per TMI request due to the elongation behavior of V140, one of the original surveillance tendons. Pease refer to Topical Report No. 183 for details on the scope of this additional work.

vi

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND Aelren Cm An Exelon Company IC - -4 S"'t-o UNIT 1 CONTAINMENT BUILDING INTRODUCTION (Continued)

The following pages are a breif overview on the steps performed in a surveillance.

Access platforms were hung from upper support frames in order to access hoop and dome tendons on the exterior of the reactor building.

After the grease can has been removed, the anchorage assembly is cleaned for inspection.

During this process the QC inspector takes note of any water present as well as the grease coverage and consistency.

vii

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnerxenCm An Exelon Company Ic<. Ste f8 UNIT 1 CONTAINMENT BUILDING e"_~

INTRODUCTION (Continued)

Two samples of grease are taken from the grease can and/or the anchorage assembly by the QC inspector to be sent for analysis in order to ensure the grease has not abnormally degraded A unique ID number is stamped on the face of each anchorhead. This allows the QC inspector to identify the tendon end and perform the associated inspections.

viii

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnerxenCm An Exelon Company t 4_ 5 __ UNIT 1 CONTAINMENT BUILDING

  • el . S.,,t^ C INTRODUCTION (Continued)

The QC inspector checks the anchorage as-sembly (anchorhead, buttonheads, shims, and bearing plate) for any signs of corrosion or other deterioration and records his findings on the appropriate data sheets.

Once the anchorage assembly is cleaned and inspected a hydraulic jack is coupled and a liftoff is performed. A liftoff consists of inserting 0.030" feeler gauges between the anchorhead and the shim stack. When force is transferred from the tendon to the hydraulic jack the feeler gauges become loose. The jack pressure at this point correlates to the force in that tendon end.

ix

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AerGen,-

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INTRODUCTION (Continued)

For tendons that were chosen to be detensioned, the shims are then removed and cleaned.

With all the shims removed, the pressure on the hydraulic jack is relieved, and the force in the tendon decreases to zero. It is now in a detensioned state.

x

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE At@Melas THREE MILE ISLAND An Exelon Company

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INTRODUCTION (Continued)

A common wire is located from both ends of the tendon, and a buttonhead puller is installed for the removal of the test wire.

The buttonhead is cut off one end of the wire and it is pulled through the tendon.

xi

i Lj I THIRTIETH YEAR SURVEILLANCE L OF THE POST-TENSIONING SYSTEM AT THE J% l3en~

THREE MILE ISLAND An Exelon Company UNIT 1 CONTAINMENT BUILDING te"_

INTRODUCTION (Continued)

U After the test wire has been re-moved, the tendon is retensioned and the shims are replaced. This restores the force originally found LI)

A light hand-coat of grease is applied to the anchorage assembly in order to ensure complete coverage and protection from corrosion.

xii

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company

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INTRODUCTION (Continued)

After the grease can has been installed with a new gasket, new hot grease is pressure pumped back into the grease can and tendon void.

Where pressure pumping is not necessary because only the grease can needs to be refilled, new hot grease is poured into the can.

xiii

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THIRTIETH YEAR SURVEILLANCE NM OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND f erwen UNIT 1 CONTAINMENT BUILDING An Exelon Company SURVEILLANCE PROCEDURES Volume 3, Section 9, Appendix F of this 30th Year Physical Surveillance Report contains the detailed procedures for conducting the tendon surveillance.

The surveillance consists of the following steps:

1. Visual examination of casing filler grease.
2. Analytical testing of casing filler grease samples.
3. Inspection of the anchorage assembly of each of the surveillance tendon ends for deleterious conditions such as corrosion, cracks, broken or missing buttonheads.
4. Inspection of concrete surrounding the bearing plate.
5. Measurement of the liftoff force for each of the physical surveillance tendons.
6. Removal of one wire from the surveillance tendons which are detensioned for examination and testing.
7. Retensioning of the detensioned tendons and measuring the corresponding tendon elongation.
8. Visual inspection for corrosion, pitting, or any significant physical change to the removed wires.
9. Testing of wires removed from tendons for yield strength, ultimate strength, and percentage elongation at failure.
10. Resealing tendon cans and replacement of lost sheathing filler into the tendon duct and grease can.
11. Evaluation of test and inspection results to assess the general condition of the post tensioning system.

I

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND meren.

UNIT 1 CONTAINMENT BUILDING An Exelon Company II. SHEATHING FILLER ANALYSIS A sample of sheathing filler (grease) was removed from each end of the surveillance tendons.

Chemical tests were performed on each sample by Suburban Laboratories, Inc., the results are presented in Section 5, Appendix B and are summarized in Table 1.

The maximum acceptable limits are 10 percent by weight for water content and 10 parts per million for water-soluble chlorides, nitrates and sulfides. All samples met these acceptance criteria.

Also included was the report of the neutralization number of each grease sample. This test is generally performed by grease manufacturers on new batches of the product and is a method of determining the overbase additives in the grease. Degradation of the sheathing filler will yield a change in the acidity of the filler material as well as an increase in the ion content. All neutralization numbers were above the IWL requirement of 2 50% of the originally installed value. According to the TMI Procedure 1301-9.1 rev. 18, Enclosure 3, the installed value for the Reserve Alkalinity for the original Visconorust 2090P and 2090P-2 is zero (0) mg KOH/g. All of the grease samples tested met these acceptance criteria.

2

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AEerGenC An Exelon Company Z - - UNIT 1 CONTAINMENT BUILDING TABLE IA: LABORATORY ANALYSIS OF SHEATHING FILLER-DOME TENDONS TENDON END ION CONCENTRATION (PPM)  % WATER NEUTRAL No.

CHLORIDE _JSULFIDE NITRATE CONTENT mg KOH/g D-213 SHOP/NE < 0.50 < 0.50 < 0.50 < 0.10 3.23 FIELD/SE < 0.50 < 0.50 < 0.50 < 0.10 34.9 D-225 SHOP/NW < 0.50 < 0.50 < 0.50 0.31 65.2 FIELD/SE < 0.50 < 0.50 < 0.50 0.15 48.9 D-230 SHOP/NW < 0.50 < 0.50 < 0.50 <0.10 1.37 FIELD/SE 0.60 < 0.50 < 0.50 < 0.10 52.0 D-342 FIELD/NW < 0.50 < 0.50 < 0.50 < 0.10 0.70 TABLE 1B: LABORATORY ANALYSIS OF SHEATHING FILLER-HOOP TENDONS H13-11 SHOP/BI 1.0 < 0.50 < 0.50 < 0.10 3.09 FIELD/B3 0.60 < 0.50 < 0.50 < 0.10 4.58 H35-49 SHOP/B3 < 0.50 < 0.50 < 0.50 < 0.10 6.17 FIELD/B5 < 0.50 < 0.50 < 0.50 0.15 3.12 H46-25 SHOP/B4 0.60 < 0.50 < 0.50 < 0.10 1.27 FIELD/B6 < 0.50 < 0.50 < 0.50 < 0.10 1.74 H62-18 SHOPIB6 < 0.50 < 0.50 < 0.50 < 0.10 6.04 FIELD/B2 < 0.50 < 0.50 < 0.50 < 0.10 2.91 H62-26 SHOP/B6 < 0.50 < 0.50 < 0.50 < 0.10 56.6 FIELD/B2 < 0.50 < 0.50 < 0.50 < 0.10 59.5 Acceptance Limits Test Limits Water Soluble Chloride Less than 10.0 ppm Water Soluble Nitrates Less than 10.0 ppm Water Soluble Sulfides Less than 10.0 ppm Water Content Less than 10% Dry Weight Neutralization No. Greater than 0 mg KOH/g 3

THIRTIETH YEAR SURVEILLANCE OF TIlE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnerGen mn An Exelon Company

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UNIT 1 CONTAINMENT BUILDING ear'-4" TABLE 1C: LABORATORY ANALYSIS OF SHEATHING FILLER-VERTICAL TENDONS TENDON END ION CONCENTRATION (PPM)  % WATER NEUTRAL No.

CHLORIDE SULFIDE _JNITRATE CONTENT mg KOH/g V-32 SHOP/TOP < 0.50 < 0.50 < 0.50 0.64 68.1 FIELDIBOT < 0.50 < 0.50 < 0.50 0.31 25.8 V-53 SHOP/TOP < 0.50 < 0.50 < 0.50 0.14 42.6 FIELDIBOT < 0.50 < 0.50 < 0.50 < 0.10 2.91 V-66 SHOP/TOP < 0.50 < 0.50 < 0.50 < 0.10 55.7 FIELD/BOT < 0.50 < 0.50 < 0.50 < 0.10 2.70 V-86 FIELD/1OT < 0.50 < 0.50 < 0.50 3.7 41.4 V-137 SHOP/TOP N/A* N/A* N/A* NIA* N/A*

FIELD/1OT N/A* N/A* N/A* N/A* N/A*

V-140 SHOP/TOP < 0.50 < 0.50 < 0.50 0.14 46.7 FIELDIBOT < 0.50 < 0.50 < 0.50 <0.10 1.85 V-141 SHOP/TOP NIA* N/A* NIA* N/A* N/A*

FIELD/BOT NIA* N/A* N/A* NIA* NIA*

V-164 FIELD/BOT 0.60 < 0.50 < 0.50 0.19 45.2

  • No grease samples were taken from either end of V137 or V141 (added scope work) per TMI Engineering Acceptance Limits Test Limits Water Soluble Chloride Less than 10.0 ppm Water Soluble Nitrates Less than 10.0 ppm Water Soluble Sulfides Less than 10.0 ppm Water Content Less than 10% Dry Weight Neutralization No. Greater than 0 mg KOH/g 4

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THEhmer%7en THREE MILE ISLAND IZ,LA UNIT I CONTAINMENT BUILDING An Exelon Company III. ANCHORAGE COMPONENTS In the following discussion, all procedures referred to are included in Volume IV, Section 9, Appendix F of this report while all data sheets are included in Section 4, Appendix A.

Inspection of the anchorage components began with the removal of the grease can using TMI Procedure 1301-9.1 and PSC Procedure SQ 6.0. Complete grease coating (100%) was found on all of the tendon ends. The percentage of grease coverage was recorded on Data Sheet SQ 6.0 and the results summarized in Table 2.

During removal of the grease can and physical inspections of the anchorage assemblies the presence and quantity of any water is noted on Data Sheet SQ 6.1 according to TMI Procedure 1301-9.1 and PSC Procedure SQ 6.1. During the 30th year surveillance, no water was detected in any of the grease cans or on any of the anchorage components. Water Inspections are summarized in Table 3.

The anchorage components (buttonhead, anchorhead, shims, and bearing plate) were inspected for corrosion level and cracks per TMI Procedure 1301-9.1, Enclosure 6. The results were recorded on Attachment 5 and are summarized in Table 4. Corrosion levels on all items were either level 1/N -

"no visible oxidation", or level 2 - "visible oxidation, no pitting" for all tendons. The condition of the bearing plates on these tendons were also recorded as Level 1/N or Level 2 for all tendons.

Inspection showed the condition of all anchorage components inside the can as acceptable. No evidence of cracking was observed on any of the anchorage components. The pictures below show some examples of the excellent condition of the anchorage assemblies.

5

THIRTIETH YEAR SURVEILLANCE _

Ariw ens.

A OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND I UNIT 1 CONTAINMENT BUILDING An Exelon Company III. ANCHORAGE COMPONENTS (Continued)

The buttonheads were inspected for their physical condition and a count was made of protruding, missing buttonheads per TMI Procedure 1301-9.1, Enclosure 6. The results of these inspections are also recorded on Enclosure 6, Data Sheet 1 and Data Sheet 4, and summarized in Table 5. All the buttonheads were found acceptable except for two tendon ends, the field end of H62-1 8 and the field end of V137. In both cases, these tendon ends had one or more protruding buttonheads which are mapped on the corresponding data sheets. The data sheet for V137 as well as a corresponding picture depicting the protruding buttonheads are shown on the following sheet. V137 was an added scope tendon and was scheduled to be detensioned and retensioned. TMI Engineering was notified and determined there were no indications that the wires were broken and no further investigation was required. After it was retensioned the protruding buttonheads did not seat, however the length of protrusion decreased on all except for one (1) buttonhead. It is probable that the wires have been strangulated at a point along the length of the tendon by the other wires. These wires were not considered to be effective. The data sheet for V137 as well as a corresponding picture are shown on the following page depicting the protruding buttonheads.

The concrete was inspected around the bearing plates for cracks per TMI Procedure 1301-9.1, Enclosure 6 with the results being recorded on Attachment 6 and summarized in Table 6. Cracks that had a width in excess of 0.010" were not detected on any of the inspected concrete surrounding the bearing plates on any tendon. The only cracks identified were less than 0.010" which classifies them as hairline cracks. These cracks were monitored during stressing and none of them grew any larger than when they were found. There was a popout located near the field end of V140 and a spall below H62-26. A photograph of the popout near V140 is shown below.

6

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE AmerGenm THREE MILE ISLAND An Exelon Company UNIT 1 CONTAINMENT BUILDING III. ANCHORAGE COMPONENTS (Continued)

ENCLOSURE 6 t; ,?fv ; & DataSheet4 J Tendon Buttonhead Inspeton 1RB1 COMMET*F 14si~

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7

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company tz? e - Sa CA UNIT 1 CONTAINMENT BUILDING ear4~4 TABLE 2A: GREASE CAP REMOVAL - DOME TENDONS GREASE COATING (%)

TENDON END GREASE J BUTTON- J ANCHOR- SHIMS BEARING CAN HEADS l HEADS l PLATE D-213 SHOP/NW 100 100 100 100 100 FIELD/SE 100 100 100 100 100 D-225 SHOP/NW 100 100 100 100 100 FIELD/SW 100 100 100 100 100 D-230 SHOP/NEAR 5 100 100 100 100 100 FIELD/NEAR 3 100 100 100 100 100 D-342 FIELD/NEAR 4 100 100 100 100 100 TABLE 2B: GREASE CAP REMOVAL -HOOP TENDONS GREASE COATING (%) l TENDON END GREASE BUTTON- ANCHOR- I SHIMS BEARING CAN HEADS HEADS l PLATE H13-11 SHOP/BUTT. 1 100 100 100 100 100 FIELD/BUTT.3 100 100 100 100 100 H35-49 SHOP/BUTT. 5 100 100 100 100 100 FIELD/BUTT.3 100 100 100 100 100 H46-25 SHOP/BUTT.6 100 100 100 100 100 FIELD/BUTT.4 100 100 100 100 100 H62-18 SHOP/BUTT. 6 100 100 100 100 100 FIELD/BUTT. 2 100 100 100 100 100 H62-26 SHOP/BUTT. 6 100 100 100 100 100 FIELD/BUTT. 2 100 100 100 100 100 8

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND Anexe nCmp An Exelon Company tZ)

UNIT 1 CONTAINMENT BUILDING TABLE 2C: GREASE CAP REMOVAL - VERTICAL TENDONS TENDON END GREASE COATING (%) l GREASE BUTTON- ANCHOR- SHIMS BEARING CAN HEADS HEADS PLATE V-32 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-53 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-66 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-86 FIELD/BOT N/A N/A N/A N/A N/A V-137 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-140 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-141 SHOP/TOP 100 100 100 100 100 FIELD/BOT 100 100 100 100 100 V-164 FIELD/BOT N/A N/A N/A N/A N/A NOTE: Grease samples were taken from the field ends of V-86 and V-l 64 using a Y-Device as per Topical Report (T.R.) No. 136, the grease cap was not physically removed.

9

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company UNIT 1 CONTAINMENT BUILDING em TABLE 3A: INSPECT FOR WATER - DOME TENDONS TENDON END WATER QUANTITY D-213 SHOP/NW I NONE FIELD/SE NONE D-225 SHOP/NW NONE FIELD/SW NONE D-230 SHOP/NEAR BUTTRESS 5 NONE FIELD/NEAR BUTTRESS 3 NONE D-342 SHOP/NEAR BUTTRESS 4 NONE D-213 M SHOP D-225 El FIELD NONE FOUND D-230 D-342 0 10 20 30 40 50 60 70 OUNCES 10

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND Ameren Cm An Exelon Company UNIT I CONTAINMENT BUILDING e_se.,.

teetr8 4 OAt t TABLE 3B: INSPECT FOR WATER-HOOP TENDONS TENDON END WATER QUANTITY H13-11 SHOP/BUTTRESS 1 NONE FIELD/BUTTRESS 3 NONE H35-49 SHOP/BUTTRESS 5 NONE FIELD/BUTTRESS 3 NONE H46-25 SHOP/BUTTRESS 6 NONE FIELD/BUTTRESS 4 NONE H62-18 SHOP/BUTTRESS 6 NONE FIELD/BUTTRESS 2 NONE H62-26 SHOP/BUTTRESS 6 NONE FIELD/BUTTRESS 2 NONE H13-11 E SHOP H35-49

=d FIELD H46-25 NONE FOUND H62-18 H62-26 0 10 20 30 40 50 60 70 OUNCES II

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnexrenCm An Exelon Company

12) - -- CAi UNIT 1 CONTAINMENT BUILDING e m-4.

TABLE 3C: INSPECT FOR WATER - VERTICAL TENDONS TENDON END WATER QUANTITY V-32 SHOP/TOP NONE FIELD/BOTTOM NONE V-53 SHOP/TOP NONE FIELD/BOTTOM NONE V-66 SHOP/TOP NONE FIELD/BOTTOM NONE V-86 FIELD/BOTTOM NONE V-137 SHOP/TOP NONE FIELD/BOTTOM NONE V-140 SHOP/TOP NONE FIELD/BOTTOM NONE V-141 SHOP/TOP NONE FIELD/BOTTOM NONE V-164 FIELD/BOTTOM NONE V-53 l m SHOP

= FIELD V-66 V-86 V-137 NONE FOUND V-140 V-141 V-164 0 10 20 30 40 50 60 70 OUNCES 12

THIRTIETH YEAR SURVEILLANCEAr c) >OF THE POST-TENSIONING SYSTEM AT THEIAe THREE MILE ISLAND eruen, L && UNIT 1 CONTAINMENT BUILDING An Exelon Company TAesBLE 4 ANC TABLE 4A: ANCHORAGE CORROSION CONDITION-DOME TENDONS CORROSION LEVEL/ CRACKS TENDON END ANCHOR I.D. BUTTON- ANCHOR- BEARING BUTTON- ANCHOR- SHIMS BERN HEADS HEAD PLATE D-213 SHOP/NW 771 I/NONE I/NONE I/NONE 2/NONE FIELD/SW 947 I/NONE I/NONE I/NONE 2/NONE D-225 SHOP/NW 765 I/NONE I/NONE 1/NONE 2/NONE FIELD/SW 684 1/NONE I/NONE I/NONE 2/NONE D-230 SHOPINEAR 5 757 N/NONE N/NONE N/NONE N/NONE FIELD/NEAR 3 944 N/NONE N/NONE N/NONE N/NONE D-342 FIELD/NEAR 4 841 N/NONE N/NONE N/NONE N/NONE TABLE 4B: ANCHORAGE CORROSION CONDITION-HOOP TENDONS H13-11 SHOP/BUTTRESS I 557 N/NONE N/NONE N/NONE N/NONE FIELD/BUTTRESS 3 933 N/NONE N/NONE N/NONE N/NONE L H35-49 SHOP/BUTTRESS 5 970 I/NONE I/NONE 2/NONE 2/NONE FIELD/BUTTRESS 3 848 I/NONE I/NONE I/NONE 2/NONE 1H46-25 SHOP/BUTTRESS 6 580 N/NONE N/NONE N/NONE N/NONE FIELD/BUTTRESS 4 1009 N/NONE N/NONE N/NONE N/NONE

- H62-18 SHOP/BUTTRESS 6 1053 N/NONE N/NONE N/NONE N/NONE FIELD/BUTTRESS 2 948 N/NONE N/NONE N/NONE N/NONE H62-26 SHOP/BUTTRESS 6 837 I/NONE I/NONE 1/NONE 2/NONE

  • FIELD/BUTTRESS 2 571 N/NONE N/NONE N/NONE N/NONE
  • Inspection performed after liftoff 1 /I NONE 1 / N No visible oxidation.

2 Metal redish brown color; no pitting. Indicates Corrosion Level IIndicates Cracks 13

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An ExeonCm An Exelon Company tz~-

UNIT I CONTAINMENT BUILDING TABLE 4C: ANCHORAGE CORROSION CONDITION-VERTICAL TENDONS CORROSION LEVEL/ CRACKS TENDON END ANCHOR I.D. BUTTON-HEADS ANCHOR-HEAD S

HIMS I BEARING PLATE V-32 SHOP/TOP 1050 1/NONE I/NONE I/NONE 2/NONE FIELDIBOTTOM 657 1 / NONE I/NONE 1/NONE 1/NONE V-53 SHOP/TOP 1047 1 /NONE 2/NONE 2/NONE 2/NONE FIELDIBOTTOM 106 1 /NONE 1/NONE 1/NONE I/NONE V-66 SHOP/TOP 1118 1/NONE 1/NONE 2/NONE 2/NONE FIELD/BOTTOM 1055 1 /NONE 1/NONE 1/NONE 1/NONE V-137 SHOP/TOP 878 N/At N/At N/At N/At FIELDIBOTTOM 587 N/At N/At N/Af N/At V-140 SHOP/TOP 918 I /NONE 1/NONE 2/NONE 2/NONE FIELD/BOTTOM N/A* I /NONE 1/NONE 1/NONE 1/NONE V-141 SHOP/TOP 869 N/At N/At N/At N/At FIELD/BOTTOM 539 N/At N/At N/At N/At

  • The I.D. # could not be located on the field end of V-140 t VT-I Inspections were not performed on V-137 and V-141 (added scope) per TMI Engineering 1/NONE 1 / N No visible oxidation.

2 Metal redish brown color; no pitting. Indicates Corrosion Level Indicates Cracks 14

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company

.Z- - UNIT 1 CONTAINMENT BUILDING

"-w;..

TABLE 5A: BUTTONHEAD INSPECTION-DOME TENDONS NUMBER OF MISSING, TENDON END BROKEN OR PROTRUDING ANCHOR BUTTONHEADS ID BUSHING ID COMMENTS AS FOUND AS LEFT D-213 SHOP/NW 0 0 771 1030 FIELD/SE 0 0 947 N/A D-225 SHOP/NW 0 0 765 1137 FIELD/SW 0 0 684 N/A D-230 SHOP/NW 0 1 757 703 Wire removed for testing FIELD/SE 0 1 944 N/A D-342 FIELD/SW 0 0 841 N/A TABLE 5B: BUTTONHEAD INSPECTION-HOOP TENDONS H13-11 SHOP/B I 0 0 557 1039 FIELD/B3 0 0 933 N/A H35-49 SHOPIB5 0 0 970 852 FIELD/B3 0 0 484 N/A H46-25 SHOP/B6 0 1 580 1252 Wire removed for testing FIELD/B4 0 1 1009 N/A H62-18 SHOP/B6 0 0 1053 761 FIELD/B2 1 1 948 N/A I protruding approx. 1/8" H62-26 SHOP/16 0 0 837 924 FIELD/B2 0 0 571 N/A NOTE: All missing, broken and protruding buttonheads are mapped on Data Sheet 4 of Enclosure 6 15

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnerGenCm An Exelon Company

.tb UNIT 1 CONTAINMENT BUILDING TABLE 5C: BUTTONHEAD INSPECTION-VERTICAL TENDONS NUMBER OF MISSING, TENDON END BROKEN OR PROTRUDING ANCHOR BUSHING COMMENTS V-32 TEDN EDBUTTONHEADS SHOP/TOP AS FOUND 0

j AS LEFT 0

ID 1050 ID 1036 FIELD/BOT 0 0 657 N/A V-53 SHOP/TOP 0 0 1047 1087 FIELD/BOT 0 0 106 N/A V-66 SHOP/TOP 0 0 1118 1027 FIELD/BOT 0 0 1055 N/A V-137 SHOP/TOP 0 0 878 1017 FIELD/BOT 4 4 587 N/A 4 Protruding V-140 SHOP/TOP 0 1 918 1000 Wire removed for testing FIELD/BOT 0 1 918 N/A V-141 SHOP/TOP 0 0 869 1096 FIELD/BOT 0 1 539 N/A I popped off at OSF NOTE: All missing, broken and protruding buttonheads are mapped on Data Sheet 4 of Enclosure 6 16

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An ExelonCp An Exelon Company l _ UNIT 1 CONTAINMENT BUILDING TABLE 6A: CONCRETE CONDITION AROUND BEARING PLATES-DOME TENDONS CRACKS WITH WIDTHS >0.010" TENDON END MQUANTITY AX. LENGTH MAX. WIDTH (IN)

QUANTITY ~~(IN) MA.WDH(N D-213 SHOP/NW NONE N/A N/A FIELD/SE NONE N/A N/A D-225 SHOP/NW NONE N/A N/A FIELD/SW NONE N/A N/A D-230 SHOP/NEAR 5 NONE N/A N/A FIELD/NEAR 3 NONE N/A N/A D-342 FIELD/NEAR 4 NONE N/A N/A TABLE 6B: CONCRETE CONDITION AROUND BEARING PLATES-HOOP TENDONS H13-11 SHOP/BUTT.l NONE N/A N/A FIELD/BUTT.3 NONE N/A N/A H35-49 SHOP/BUTT.5 NONE N/A N/A FIELD/BUTT.3 NONE N/A N/A H46-25 SHOP/BUTT.6 NONE N/A N/A FIELD/BUTT.4 NONE N/A N/A H62-18 SHOP/BUTT.6 NONE N/A N/A FIELD/BUTT.2 NONE N/A N/A H62-26 SHOP/BUTT.6 NONE* N/A* N/A*

FIELD/BUTT.2 NONE N/A N/A

  • A Spall 112" below the bearing plate of the shop end of H62-26 was located with dimensions of 12"x2"xl/4" deep 17

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AmerGen,,,v An Exelon Company t _ UNIT 1 CONTAINMENT BUILDING 2t"114,. swwei" TABLE 6C: CONCRETE CONDITION AROUND BEARING PLATES-VERTICAL TENDONS CRACKS WITH WIDTHS >0.010" TENDON END QUANTITY MAX. LENGTH MAX. WIDTH (IN)

(IN)_ _ _ _ _

V-32 SHOP/TOP NONE N/A N/A FIELD/B OTTOM NONE N/A N/A V-53 SHOP/TOP NONE N/A N/A FIELD/BOTTOM NONE N/A N/A V-66 SHOP/TOP NONE N/A N/A FIELD/BOTTOM NONE N/A N/A V-137 SHOP/TOP N/Af N/At N/At FIELD/BOTTOM N/At N/At N/At V-140 SHOP/TOP NONE N/A N/A FIELD/BOTTOM NONE* N/A* N/A*

V-141 SHOP/TOP N/At N/At N/At FIELD/BOTTOM N/At N/At N/At

  • A popout 1 1/2" x 1" x 1/4" deep with epoxy coating was found t VT-I Inspections were not performed on V-137 and V-141 because they were added scope to the surveillance and it was deemed unnecessary by the Cognizant Engineer 18

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company teeci -

UNIT 1 CONTAINMENT BUILDING IV. DOME TENDON CONCRETE CRACK GROWTH In addition to the surveillance tendons, nine dome tendons, listed below, were chosen by TMI and a VT-I C inspection was performed for concrete crack growth. This crack mapping is included in the scope of the surveillance and the procedure for this crack monitoring is explained in section B of Enclosure 6 in TMI Procedure 1301-9.1. The results of this inspection were recorded on Data Sheets 8 and 9 of Enclosure 6 and presented in Table 7.

Lfl' ,cv%1 Only three tendons (D-1 18, D-203 D-118 SW o r4 '..

/1 and D-225) showed cracks larger than

. l, 0.010", and nothing had changed

.00.

since the last surveillance. Sketches from Data Sheet 9, Enclosure 6 are shown below and on the following t-U £-

page for these three tendons.

I. I.

.IO014

  • I-t4~

19

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AerGen,.

An Exelon Company Zt - -

UNIT 1 CONTAINMENT BUILDING emS.a14*

IV. DOME TENDON CONCRETE CRACK GROWTH (Continued)

.S L D-203 NE

. " 57,

'n;,

I?

. DOS

, 6I t- L

.0e3 6I-1

  • Jo' L.

.6 tSA w Il I D? of. _,

I 66.k C *, s ,.

.3- I.

20

OF THIRTIETH YEAR SURVEILLANCE A THE POST-TENSIONING SYSTEM AT THE ven,,,

THREE MILE ISLAND IZ L UNIT 1 CONTAINMENT BUILDING An Exelon Company TABLE 7: CRACK GROWTH INSPECTIONS-DOME TENDONS CRACKS WITH WIDTHS >0.010" TENDON END MAX. LENGTH MAX. WIDTH REMARKS QUANTITY (IN) (IN) __ ________

D-103 NE NONE N/A N/A NO CHANGE FROM PERIOD 7 D-118 SW 7 18" 0.020" NO CHANGE FROM PERIOD 7 D-203 NE 9 11" 0.022" NO CHANGE FROM PERIOD 7 D-218 SE NONE N/A N/A NO CHANGE FROM PERIOD 7 D-225 NW 4 23" 0.020" NO CHANGE FROM PERIOD 7 D-249 SE NONE N/A N/A NO CHANGE FROM PERIOD 7 D-313 SE NONE N/A N/A NO CHANGE FROM PERIOD 7 D-329 SW NONE N/A N/A NO CHANGE FROM PERIOD 7 D-334 NW NONE N/A N/A NO CHANGE FROM PERIOD 7 21

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE in AMi, s THREE MILE ISLAND An Exelon Company tZ UNIT 1 CONTAINMENT BUILDING V. GENERAL CONTAINMENT INSPECTION A general VT-3C examination was performed on the entire containment building in order to identify any new or propagating areas of distress or degradation. Potentially unacceptable areas were then investigated further with a VT-IC inspection. The general examination was documented on Enclosure 6, Data Sheet 10. The detailed inspection of distressed areas are documented on Enclosure 6, Attachment 5. All of these data sheets and referenced pictures are included in Volume 2, Section 4, Appendix A. The following pages show some examples of notable areas found during the containment inspection however all of these items have been evaluated by TMI Engineering and the conclusions are included in Topical Report No. 183.

The protective coating is coming off the bearing plates on the top end of the vertical tendons and the bearing plates are showing signs of rust. It is recommended that bearing plates be cleaned and recoated 22

THIRTIETH YEAR SURVEILLANCE G@" 1M OF THE POST-TENSIONING SYSTEM AT THE me THREE MILE ISLAND Exelon Company I UNIT 1 CONTAINMENT BUILDING An I V. GENERAL CONTAINMENT INSPECTION (Continued)

Cracks found above Fuel Handling Building Roof between Buttresses 3 and 4. This item was noted in Topical Report T.R. 136 and cracks show no sign of active degradation since Period 7 Inspection.

23

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND An Exelon Company IZ~L s,,4 UNIT 1 CONTAINMENT BUILDING eV ER V. GENERAL CONTAINMENT INSPECTION (Continued)

Exposed and corroded rebar in SE quadrant of ring girder. Grout overlay has come off and underlying rebar is exposed and corroded. It is recommended that the rebar be cleaned and the concrete patched.

24

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AmerGien,.

An Exelon Company AC Squab UNIT 1 CONTAINMENT BUILDING e"ars4l0 V. GENERAL CONTAINMENT INSPECTION (Continued)

AP .,'

.1N I1 I.

,t Pw,, tr .i 3c ?

oF C.M1-AbGF- I c:>f-N0AE 25

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE m elllnM THREE MILE ISLAND I UNIT 1 CONTAINMENT BUILDING An Exelon Company VI. HYDRAULIC JACK CALIBRATIONS Precision Surveillance has developed a program for calibrating hydraulic jacks utilizing regression analysis (PSC Procedure QA 12.8.G-W). This is a process where a straight line is mathematically best fitted to a set of data points (in this case, force verses gauge pressure). This results in calculating ram area (slope) and constant (y-intercept) for each jack calibration. Completed calibrations for all of the hydraulic jacks used are contained in Appendix E and are summarized in Table 8.

A before and after comparison of the stressing jacks' ram areas revealed that none of the stressing jacks' calibrations varied by more than 0.479%, indicating that they were in a properly calibrated status throughout the surveillance.

The wire testing ram 7702 was also found to be in a properly calibrated status.

Note that the force exerted by ajack can be calculated as follows:

Force = Area x Pressure + Constant (F) (in 2 ) (KSI) (K) 26

F---- [_ _' F.- r--- _- f- [a_ 1-7I I 17[77 [ r [:I-7FFa V- 7 [I--- [7 I-_

[7-17 F--- r--.- I .

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND Anmxelo Cnm An Exelon Company e'b

  • 4 £#Fa UNIT 1 CONTAINMENT BUILDING e,

TABLE 8: HYDRAULIC JACK CALIBRATIONS JACK BEFORE SURVEILLANCE FORCE, AFTER SURVEILLANCE FORCE, MAX VARI ID DATE AREA CONSTANT Fi DATE AREA CONSTANT Ff PRESSUREN (in 2 ) (kips) (kips) (in 2) (kips) (kips) (psi) 9365 7/24/04 212.65 -0.077 1794.77 2/4/05 212.544 -3.633 1790.24 8440 0.25 wN 6001 9/2/04 191.784 -7.404 1622.76 2/4/05 190.993 -6.358 1617.08 8500 0.35 6002 9/2/04 191.565 -4.911 1623.39 2/4/05 190.823 -6.382 1615.61 8500 0.48 7702 1 9/3/04 1 1.574 1 0.234 1 13.613 1 1/17/05 1 1.576 1 0.232 1 13.628 1 8500 1 0.11 RAM 7702 USED FOR WIRE TESTING

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND I UNIT I CONTAINMENT BUILDING An Exelon Company VII. TENDON LIFTOFFS AND DETENSIONING Prior to coupling a ram onto the tendon and performing a liftoff, the threads on the anchorhead are measured in order to ensure strength and stability of the coupling connection. Thread measurement is outlined in PSC Procedure SQ 7.1. The results are recorded on Data Sheet SQ 7.1 and summarized in Table 9.

A liftoff was performed on each surveillance tendon to monitor the force exerted by the tendon onto the containment structure. TMI Procedure 1301-9.1 rev. 18, Section 8.2.7 details the steps to be taken to perform a liftoff. The results are documented on Data Sheet 7 and are summarized in Table 10.

It should be noted that performing a liftoff has only a localized effect on a tendon; therefore, it is acceptable to use the same jacks for both ends of a tendon by executing the liftoff on separate occasions.

Once all the liftoffs for a group are performed, the values are normalized using the specific normalizing factor for that tendon, and then the normalized liftoffs are averaged. The normalization and averages of the liftoffs are calculated on Data Sheet 5 and summarized in Table

11. IWL requires that "the average of all measured tendon force for each type of tendon is equal or greater than the minimum required prestress specified at the anchorage for that type of tendon".

Minimum design stress values for Three Mile Island tendons, by group per design are:

Dome: 1064 kips for a 169 wire tendon Hoop: 1108 kips for a 169 wire tendon Vertical: 1033 kips for a 169 wire tendon All of the liftoff values were found to be above the 95% Predicted Force. Every tendon, except for V-140 and V-141 were above the Predicted force itself. All of the group averages were also above the minimum required design force, with Domes having an average of 1226.5 kips, hoops 1192 kips, and verticals 123 8 kips. Since the liftoffs were found to be higher than expected values, it is evident that the post tensioning system has not experienced any abnormal degradation.

After the liftoff has been performed, the shims are removed from tendons which are scheduled to have a test wire removed and the tendon is detensioned. TMI Procedure 1301-9.1 rev. 18, Section 8.2.8 outlines the steps followed to detension a tendon. The next few pages show pictures of a tendon being detensioned.

No additional or broken wires were noted during or after liftoffs or detensioning.

28

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND ArmerGen@

An Exelon Company UNIT 1 CONTAINMENT BUILDING t lb41 6 . Sago6CtA g C VII. TENDON LIFTOFFS AND DETENSIONING (Continued)

Detensioning of H46-25 The ram is coupled to the tendon (right) and a liftoff is performed.

Shims are then removed (below) and the force on the tendon is reduced to zero.

29

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND A~erGien,,

An Exelon Company I Xm UNIT 1 CONTAINMENT BUILDING VII. TENDON LIFTOFFS AND DETENSIONING (Continued)

Li Li Li Li ~~

30

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND m eru'en..

L UNIT 1 CONTAINMENT BUILDING An Exelon Company em TABLE 9A: ANCHORAGE THREAD MEASUREMENTS-DOME TENDONS TENDON END ANCHOR BUSHING EXTERNAL THREAD DIA. (in) ACCEPTABLE I.D. I.D. ADAPTOR MAJOR PITCH MINOR D-213 SHOP/NW 771 1030 9.365 9.253 9.187 C6001 FIELD/SE 947 N/A 9.363 9.245 9.172 C6002 D-225 SHOP/NW 765 1137 9.369 9.263 9.187 C6001 FIELD/SW 684 N/A 9.371 9.258 9.184 C6002 D-230 SHOP/NEAR 5 757 703 9.374 9.256 9.183 C6001 FIELD/NEAR 3 944 N/A 9.373 9.243 9.175 C6002 TABLE 9B: ANCHORAGE THREAD MEASUREMENTS-HOOP TENDONS H13-11 SHOP/BUTT. 1 557 1039 9.372 9.256 9.180 C6001 FIELD/BUTT.3 933 N/A 9.368 9.241 9.172 C6001 H35-49 SHOP/BUTT. 5 970 852 9.371 9.260 9.184 C6001 FIELD/BUTT. 3 484 N/A 9.365 9.266 9.191 C6002 H46-25 SHOP/BUTT. 6 580 1252 9.373 9.249 9.184 C6001 FIELD/BUTT. 4 1009 N/A 9.370 9.251 9.169 C6002 H62-18 SHOP/BUTT. 6 1053 761 9.370 9.260 9.180 C6001 FIELD/BUTT. 2 948 N/A 9.372 9.254 9.177 C6001 H62-26 SHOP/BUTT. 6 837 924 9.370 9.270 9.173 C6001 FIELD/BUTT. 2 571 N/A 9.369 9.269 9.173 C6002 TABLE 9C: ANCHORAGE THREAD MEASUREMENTS-VERTICAL TENDONS V-32 SHOP/TOP v 1036 9.368 9.262 9.193 D4 V-53 SHOP/TOP 1047 1087 9.368 9.270 9.180 D4 V-66 SHOP/TOP 1118 1027 9.370 9.263 9.188 D4 V-137 SHOP/TOP 878 1017 9.371 9.262 9.191 D4 V-140 SHOP/TOP 918 1000 9.369 9.254 9.186 D4 V-141 SHOP/TOP 869 1096 9.375 9.263 9.187 D4 31

-X-F-- I -- m-- F-,- 1I [IF V- [77 17

[1 1 [II-- - I-:---- [7 r r-- rI--- r_- 1-7 THIRTIETH YEAR SURVEILLANCE M l l ,

OF THE POST-TENSIONING SYSTEM AT THE Aler en.s THREE MILE ISLAND An Exelon Company UNIT 1 CONTAINMENT BUILDING 1121.A 5.-

4el#,

TABLE 10A: TENDON LIFTOFFS-DOME TENDONS TENDON END EFC JA CKPREDICTED AKPES LIFTOFF LIFTOFF VE.ECT FORCE 95%

PREDICTED 90%

PREDICTED REACTOR BLDG.

TEMP. (ff) ACCEPT WIRES No. (PSI) (IS (KP) FORCE FORCE IN. ET (KIS) (KIS) (KIPS) (KIPS) IT. E.

D-213 SHOP/NE 169 6001 5610 1068 120.1 62 1094.5 1052 999 947 YES FIELD/SE 169 6002 5880 1121 118.6 78 D-225 SHOP/NW 169 6001 5880 1120 120.1 78 1120 1074 1020 967 YES FIELD/SE 169 6002 5870 1120 120.1 78 N)

D-230 SHOP/NW 169 6001 6100 1163 118.6 58 1149 1111 1055 1000 YES FIELD/SE 169 6002 5950 1135 118.6 58 D-342 FIELD/SW 169 N/A* N/A* N/A* N/A* N/A* N/A* N/A* N/A* N/A* N/A*

  • No liftoff was performed on tendon D-342, only the Field end was visually inspected because the Shop end is above the main steam relief and the plant was in operation

[ 1 - --- - [7[ I( F-X [ '

F-F" [- 7 [---

[r r- --- -1.-;-: r- i --

r-:- I THIRTIETH YEAR SURVEILLANCE Q~J) OF THE POST-TENSIONING SYSTEM AT THEe er len.

THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING An Exelon Company TABLE 1OB: TENDON LIFTOFFS-HOOP TENDONS LIFTOFF AVE. PREDICTED 95% 90% REACTOR BLDG.

TENDON END EFFECT JACK PRESS. FORCE LIFTOFF FORCE PREDICTED PREDICTED TEMP. BDF) ACCEPT WIRES No. (PSI) (KIPS) FORCE (KIPS) FORCE FORCE INT. EXT.

H13-11 SHOP/Bi 169 6001 6400 1235 121.9 80 1218 1167 1109 1050 YES FIELD/B3 169 6001 6300 1201 120.4 75 H35-49 SHOP/B3 169 6002 6260 1194 118.9 76 1201 1120 1064 1008 YES FIELD/B5 169 6001 6340 1208 120.7 76 H46-25 SHOP/B6 169 6001 6000 1143 117.8 32 1121 1063 1010 957 YES FIELD/B4 169 6002 5760 1099 117.4 45 H62-18 SHOP/B6 169 6001 5820 1109 117.4 45 1105 1103 1048 993 YES FIELD/B2 168 6001 5780 1101 115.2 70 H62-26 SHOP/B6 169 6001 6010 1145 115.4 80 1119.8 1112 1056 1001 YES FIELD/B2 169 6002 5740 1094.6 117.7 80 TABLE 10C: TENDON LIFTOFFS-VERTICAL TENDONS V-32 SHOP/TOP 169 9365 5620 1190 1190 1186 1127 1067 121.2 82 YES V-53 SHOP/TOP 169 9365 5770 1222 1222 1205 1145 1085 121.2 82 YES V-66 SHOP/TOP 169 9635 5560 1178 1178 1170 1112 1053 120.4 84 YES V-137 SHOP/TOP 169 9365 5750 1218 1218 1185 1126 1067 121.4 58 YES V-140 SHOP/TOP 169 9365 5400 1144 1144 1174 1115 1057 121.2 80 YES V-141 SHOP/TOP 169 9365 5700 1207 1207 1225 1164 1103 121.4 58 YES

Icr: crr ,- mr-- rw. rr r.I : I_-- rr __ 1T F-1-(7 r- rc F: - _r THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AMerGen Cm An Exelon Company UNIT 1 CONTAINMENT BUILDING 1121 _

I TABLE 11: NORMALIZED TENDON LIFTOFFS AVERAGE NORMALIZING NORMALIZED AVERAGE MINIMUM CEPAL TENDON l FACTOR LIFTOZE NORMALIZED DESIGN DIFFERENCE i LITOF FATR ITOFLIFTOFF FORCE D-213 1094.5 67 1161.5 D-225 1120 45 1165 1161.2 1064 +9.1% YES D-230 1149 8 1157 H13-11 1218 -54 1164 H35-49 1201 -7 1194 H46-25 1121 51 1172 1153.4 1108 +4.1% YES H62-18 1105 10 1115 H62-26 1119.8 2 1121.8 V-32 1190 -7 1183 V-53 1222 -27 1195 V-66 1178 9 1187 1180.8 1033 +14.3% YES V-137 1218 -7 1248 V-140 1144 4 1148 V-141 1207 -46 1161

THIRTIETH YEAR SURVEILLANCE _

OF THE POST-TENSIONING SYSTEM AT THE PMerLen..

THREE MILE ISLAND UNIT 1 CONTAINMENT BUILDING An Exelon Company VIII. TENDON RETENSIONING After the test wire was removed, the detension tendons were then retensioned back to acceptable force levels. The procedure outlining the steps in retensioning a tendon is TMI Procedure 1301-9.1 rev. 18, Section 8.2.10. The results from retensioning are recorded on Data Sheet 4 and summarized in Table 12.

All of the surveillance tendons exhibited an acceptable elongation when compared to the elongation from original construction (+/-10%). Elongation graphs comparing force vs. elongation for original construction and this 30th year surveillance are included in Table 13. All tendons surveillance tendons were locked off at forces higher than found, and lock off forces were within the acceptable bounds stated in TMI Procedure 1301-9.1. No additional missing or broken wires were noted on the surveillance tendons after retensioning.

At the request of TMI, two additional vertical tendons (V137 & V141) were detensioned and retensioned. Both of these tendons showed acceptable elongation and were left at acceptable lock off forces. The summary of retensioning data for these tendons is also included in Tables 12 and 13.

During the retensioning of V141, one buttonhead popped off the field end at overstress force. The inspection performed after retensioning V141 showed no signs of damage to additional wires or anchorage components.

All three vertical tendons exhibited varying amounts of anchorhead rotation during either detensioning, retensioning, or both. The details of this rotation are recorded on Data Sheet 10 and summarized in Table 14.

35

I-- 10-- I '_ [- ' 1

- I-77 [77 --- [ ----- [7 7-F. 1 1-I' [ .- i. 1:

-7 I__- [ __

I_

F THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnEelrnCmn An Exelon Company UNIT 1 CONTAINMENT BUILDING 11~2~San-TABLE 12: TENDON RETENSIONING ORIGINAL OBSERVED AVE.

ELONGATION ELONGATION [  % LIFTOFF RETENSIONING TEDNEDVARI. VAR]. ACCEPT BFR ACCEPT TEDN ED TOTAL RATE EACH TOTAL RATE IN IN BEFRETN JAK PRESS. FORCE t (I) (IN-KIP/ ( QN) (IN-KIP/ TOTL ATE(KPS NOJ (S)AKCS (IN)_ WIRE) (IN) N)_ WIRE) TOART_(ISN. (PI_(IS D-230 SHOP/NW 4.6 1163 6001 7000 1335 YES 10.3 1.32 10.1 1.32 -1.94 -.068 YES FIELD/SW 5.5 1135 6002 7100 1355 YES H46-25 SHOP/B6 5.5 1143 6001 6850 1306 YES 9.7 1.21 10.4 1.21 +7.22 +0.05 YES FIELD/B4 4.9 1099 6002 6900 1317 YES V-137 SHOP/TOP 11.89 1.45 11.6 11.6 1.43 -2.44 -1.37 YES 1218 9365 5850 1239 YES V-1401 SHOP/TOP 12.0 1.52 13.15 13.15 1.62 +9.58 +6.58 YES 1144 9365 6400 1355.5 YES V-141: SHOP/TOP 11.93 1.54 13.0 13.0 1.60 +8.97 +3.90 YES 1207 9365 6170 1307 YES

  • Acceptability is based on the % variation in elongation rates being less than 10%

t Acceptability is based on the final Lockoff force falling between the predicted base force and 70% of ultimate tendon strength.

I Data provided is from final retensioning (Total Elongation) x (No. of Effective Wires)

NOTE: Elongation Rate is calculated by the following equation:

(Over Stress Force)

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE ml ORn&~

THREE MILE ISLAND An Exelon Company UNIT 1 CONTAINMENT BUILDING em ELONGATION GRAPH - D230 12 10 8

S 0

I-6 z

0

-J 4 2

0 0 200 400 600 800 1000 1200 1400 1600 1800 FORCE (kips) 1-0-Origina A 30th Year I ELONGATION GRAPH - H46-25 12 10 8

C z 6 I0 F

4 2

0 0 200 400 600 800 1000 1200 1400 1600 1800 FORCE (kips) 1--+-Origina!

  • 30th Year I l NOTE: OSF Forces differ due to tolerance variation between construciton and surveillance periods. OSF Forces provided
  • - by TMI Engineering for surveillance.

37

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AerlGen,.ls An Exelon Company UNIT 1 CONTAINMENT BUILDING te~_~d .4-$U-U4 ELONGATION GRAPH -V137 14 12 10 2 8 + Original 0 6 I- - 30th Year 2

-0 4

-JI 2

0 0 500 1000 1500 2000 FORCE (kips)

ELONGATION GRAPH - V140 16 14

_ 12 o 10 4-Original I-- 8 0 I-- 30th Year z 6

° 4 2

0 0 500 1000 1500 2000 FORCE (kips)

ELONGATION GRAPH -V141 14 12 10 2

8 -4Original 0

p 6 I- 30th Year 0 4

-J1 tw 2

0 0 500 1000 1500 2000 FORCE (kips)

NOTE: OSF Forces differ due to tolerance variation between construciton and surveillance periods. OSF Forces provided by TMI Engineering for surveillance.

38

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND e4rJ en,.

f A f UNIT 1 CONTAINMENT BUILDING An Exelon Company 11e TABLE 14A: ANCHORHEAD ROTATION-DOME TENDONS LIFTOFF DETENSIONING RETENSIONING TENDON END T

  1. OF TURNS DIRECTION # OF TURNS lDIRECTION # OF TURNSFDIRECTION D-213 SHOP/NW 0 N/A N/A N/A N/A N/A FIELD/SE 0 N/A N/A N/A N/A N/A D-225 SHOP/NW 0 N/A N/A N/A N/A N/A FIELD/SW 0 N/A N/A N/A N/A N/A D-230 SHOP/NEAR 5 0 N/A 0 N/A 0 N/A FIELD/NEAR 3 0 N/A 0 N/A 0 N/A TABLE 14B: ANCHORHEAD ROTATION-HOOP TENDONS H13-11 SHOP/BUTT. I 0 N/A N/A N/A N/A N/A FIELD/BUTT.3 0 N/A N/A N/A N/A N/A H35-49 SHOP/BUTT. 5 0 N/A N/A N/A N/A N/A FIELD/BUTT. 3 0 N/A N/A N/A N/A N/A H46-25 SHOP/BUTT. 6 0 N/A 0 N/A 0 N/A FIELD/BUTT. 4 0 N/A 0 N/A 0 N/A H62-18 SHOP/BUTT. 6 0 N/A N/A N/A N/A N/A FIELD/BUTT. 2 0 N/A N/A N/A N/A N/A H62-26 SHOP/BUTT. 6 0 N/A N/A N/A N/A N/A FIELD/BUTT. 2 0 N/A N/A N/A N/A N/A TABLE 14C: ANCHORHEAD ROTATION-VERTICAL TENDONS V-32 SHOP/TOP 0 N/A N/A N/A N/A N/A V-53 SHOP/TOP 0 N/A N/A N/A N/A N/A V-66 SHOP/TOP 0 N/A N/A N/A N/A N/A V-137 SHOP/TOP 0 N/A 0.25 CCW 0.25 CCW V-140 SHOP/TOP 1 CW 1 CW 1 CW V-140 (2) SHOP/TOP 0 N/A 1 CW 1 CW V-141 SHOP/TOP 0 N/A I CW 0.50 CXW V-141 (2) SHOP/TOP 0 N/A 0.75 CW 0.50 CW NOTE: (2) Denotes the 2nd time a tendon was retensioned 39

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AMerGenCmy An Exelon Company UNIT 1 CONTAINMENT BUILDING em IX. WIRE INSPECTION AND TESTING One wire was scheduled for removal from each detensioned tendon for visual inspection and tensile testing. PSC Procedure SQ 10.3 outlines the details involved with the wire testing and the data was recorded on Data Sheets SQ 10.2 and SQ 10.3 with the results summarized in Table 15.

All wire diameters were within the acceptance criteria of 0.250 + 0.002" for the samples from all three detensioned tendons. The corrosion condition all samples was "A - Excellent". All samples exceeded both the minimum ultimate strength of 240,000 psi (240 ksi) and the minimum elongation at failure of 4%.

Overall, the wire test results support the conclusion that there has been no abnormal degradation to this post tensioning system.

Additionally, due to the behavior of V140 TMI Engineering requested that two samples from the V140 test wire were tested for modulus of elasticity . The results of the testing is listed below.

MODULUS OF ELASTICITY TESTING ON V140 WIRELOCAION MODULUS OF TENDON WIR LOCATION ELASTICITY (FT) (KSI)

V-140 5' 30,070 V-140 100' 28,362 40

I- 1-:.'

I- F - 17- "-'- 1-1 I- __-- 177 a177 1 >7 - 177?- F 17- 17-[

THIRTIETH YEAR SURVEILLANCE ml OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND Alereen An Exelon Company UNIT 1 CONTAINMENT BUILDING elAaeo TABLE 15: VISUAL INSPECTION AND TENSILE TESTING OF WIRES REMOVED FROM UNIT 1 TENDON WIRE CORROSION SAMPLE DIAMETER YIELD ULTIMATE ELONGATION ACCEPTABLE No. LEVEL LOCAITON (IN) STRENGTH STRENGTH (%)

(FT) (PSI) (PSI)

V-140 1 A 20'-29' 0.251 206,625 259,180 5.40 YES 2 A 90'-99' 0.251 204,077 256,313 5.25 YES 3 A 160'-169' 0.251 207,899 257,587 5.20 YES H46-25 1 A 20'-29' 0.250 214,046 260,597 5.65 YES 2 A 70'-79' 0.250 213,403 258,992 5.30 YES 3 A 130'-139' 0.250 211,156 258,349 5.35 YES D-230 1 A 20'-29' 0.251 213,951 255,995 4.65 YES 2 A 60'-69' 0.251 215,225 257,269 4.05 YES 3 A 120'-129' 0.251 217,136 261,409 4.75 YES A EXCELLENT B GOOD

eTHIRTIETH YEAR SURVEILLANCE L ~AOF I THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AerGen.-s as

.. lt UNIT 1 CONTAINMENT BUILDING An Exelon Company X. END CAP AND SHEATHING FILLER INSTALLATION After completion of the surveillance on each tendon end the anchorage components were hand coated with cold grease to ensure complete coverage. In the case of hoop and dome tendons the cans were then modified to update them to the latest design. The cans modification included drilling and tapping a vent hole for refilling sheathing filler. The through-can hold down holes were then plugged and the can is secured using hold down clamps. The old gasket is then removed and replaced with a new approved gasket, and the necessary amount of sheathing filler (grease) was added. The following pages depict the new and old grease can designs.

During the regreasing process of Unit 1, all tendons met the acceptance criteria outlined in Section 9.4 of TMI Procedure 1301-9.1 rev. 18 and PSC Procedure SQ 12.1. Results of the grease replacement were recorded on Data Sheets SQ 12.1 and are summarized in Table 16. The difference between grease added and grease removed did not exceed 4.0 gallons in any case, which in turn means the limit of 10% (12.0 gallons) was not exceeded either. All time and pressure requirements were also met during pressure pumping. These results support the conclusion that all the tendons that were inspected are again properly protected from corrosion and will not be exposed to any additional risk of degradation.

42

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AA ner;enSS An Exelon Company

  • 0

~UNIT 1 CONTAINMENT BUILDING VII. END CAP AND SHEATHING FILLER INSTALLATION (Continued)

UNDER-CAN GASKET

'O'RING OR FLAT RUBATEX DESIGN.

ORIGINAL CAN HOLD-DOWN DESIGN 43

THIRTIETH YEAR SURVEILLANCE

) OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnmExelron .sa An Ex.lon Company UNIT 1 CONTAINMENT BUILDING L

.VII. END CAP AND SHEATHING-FILLER INSTALLATION (Continued)

I.:

  • -- NWN STrESSWOG WASHER THE HYDRAULIC STESSING AM PULL'ON THIS

\ TENDON GRASE CAN-2NPTFLL \ lNPTVrENT

. BUTTO"EADS POP A-PLUGS for IW2 NPT PLUGSI-W41A .

  • I - . I I I I, II .- . - I \

/

THiS SPACE IS FILLR CASING FLLER GR- _ASE FOR CORROSION PROTEECION / - -

SPUTNSTKIC S ST'CK O -

VARINGT ICKNESSESSTACKS.O 037AIN DIPREG TENMCH UF.C4 /-

STRESS.

HCLD.DOWN CLAPS WM DOLTS AND WASHERS.

- CAP HOOP & DOME TENDON ENDIEND CAN ASSEMBLY _

LATEST- DESIGN

- 44

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE

- THREE MILE ISLAND AnEelonCm san

-- An Exelon Company lbe~ - S. d UNIT 1 CONTAINMENT BUILDING TABLE 16A: GREASE LOSS VS GREASE REPLACEMENT-DOME TENDONS

-GREASE GREASE TENDON REMOVED (GALLONS) AD NCE ACCEPTABLE*

______(GALLONS)

SHOP FIELD TOTAL SHOP FIELD TOTAL D-213 37.75 17.0 .54.75 10.5 47.75 58.25 3.5 YES D-225 6.25 7.25 13.5 7.0 8.75; 15.75 2.25 YES D-230 15.75 7.25 23.0 10.5 8.75 19.25 -3.75. YES D-342 0 8.25 8.25 0 8.75 8.75 0.5 YES TABLE 16B: GREASE LOSS VS GREASE REPLACEMENT-HOOP TENDONS H13-11 7.75 7.25 15.0 8.75 ;8.75 . 17.5 ' 2.5 YES H35-49 6.75 5.75 12.5 8.0 '8.0 '16.0 3.5 YES H46-25 8.0 8.25 16.25 10.5 8.75 19.25 3.0 -YES 1H62-18 8.5 8.0 16.5 8.75 9.0_- 17.75 1.25 YES H62-26 6.75 6.75 13.5 8.0 -8.25 16.25 2.75 YES TABLE 16C: GREASE LOSS VS GREASE REPLACEMENT-VERTICAL TENDONS V-32 5.75 30.75 36.50 0O 37.0 37.0 0.5 YES V-53 5.75 69.75 75.50 0 78.5 , 78.5 3.0 , YES V-66 '6.25 79.0 8S.25 0 87.5 87.5 2.25 - YES V-86 0.5 0 0.5 0 0 0 -0.5 YES V-137 , 5.5 45.75 51.25 0 54.0 54.0 2.75 YES V-140 6.25 77.75 84.0 0 86.73 86.73 2.73 YES V-141 5.25 54.75 60.0 , 0 62.75. 62.75 2.75 YES

  • The acceptance criteria for grease replacement is defined in Section 9.3.4 of TMI Procedure 1301-9.1 rev. 18 as: amount of grease replaced does not exceed 4 gallons more than the amount of grease removed.

' 45'

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnEelrCony An Exelon Company

_e _ %_ _

UNIT 1 CONTAINMENT BUILDING XI. COMPARISON WITH ORIGINAL INSTALLATION DATA A comparison of the liftoff forces from this surveillance to the original installation lock-off forces is made in an effort to detect any evidence of system degradation. The lock-off forces are compared in order to detect any abnormal force loss which would possibly indicate an underestimation of the creep, shrinkage and/or elastic shortening effects in the Containment Building. This comparison is summarized in detail in table 17.

The losses for the tendon groups were found to be 18.2% for the vertical tendons, 18.6% for the horizontal tendons, and 20.9% for dome tendons. All values are above the predicted lower limit. These losses are to be expected for a containment of this age and do not indicate any degradation of the system.

46

THIRTIETH YEAR SURVEILLANCE in OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND eruen..

Of *) UNIT 1 CONTAINMENT BUILDING An ExelonCompany TABLE 17: COMPARISON WITH ORIGINAL INSTALLATION DATA - UNIT 1 LIFTOFF FORCE (kips) LOSS PERCENTAGE AVERAGE TENDON(k(%) PERCENTAGE ORIGINAL @ 30 YEARS (Bps) ASED ON TOC30TYRS)

D-213 1395 1094.5 300.5 21.5 D-225 1427 1120 307 21.5 -20.9%

D-230 1432 1149 283 19.8 H13-11 1437 1218 219 15.2 H35-49 1406 1201 205 14.6 H46-25 1427 1121 306 21.4 -18.6%

H62-18 1401 1105 296 21.1 H62-26 1416 1119.8 296.2 20.9 V-32 1458 1190 268 18.4 V-53 1463 1222 241 16.5 V-66 1416 1178 238 16.8 V-140 1447 1144 303 20.9 47

z 7

-SECTI-O'N"' 0-3 '- -

I I- .

I , I I

I ,

- I

THIRTIETH YEAR SURVEILLANCE OF THE POST-TENSIONING SYSTEM AT THE THREE MILE ISLAND AnenCompan An Exelon Company UNIT 1 CONTAINMENT BUILDING em CONCLUSION Based upon an evaluation of the In-Service Inspection results for the 30th Year Physical In-Service Tendon Surveillance reported herein, PSC concludes that the Three Mile Island Unit 1 Containment Structure Post Tensioning System has experienced no abnormal degradation.

In addition, PSC inspection of the containment shows the containment concrete and reinforcing steel integrity have not been damaged or affected adversely from original construction to present date.

48

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