ML20154H039
| ML20154H039 | |
| Person / Time | |
|---|---|
| Site: | Kewaunee  |
| Issue date: | 04/30/1988 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19292H820 | List: |
| References | |
| WCAP-11818, NUDOCS 8805250204 | |
| Download: ML20154H039 (37) | |
Text
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WESTINGHOUSE NON-PROPRIETARY CLASS 3 WCAP-11818 SLIDE PRESENTATION MATERIAL NRC MEETING MARCH 31. 1988 KEWAUNEE NUCLEAR POWER PLANT STEAM GENERATOR TUBE SLEEVE INSTALLATION APRIL, 1988 WORK PERFORMED UNDER SHOP ORDER WP81-7715 WESTINGHOUSE ELECTRIC CORPORATION POWER SYSTEMS BUSINESS UNIT P. O. BOX 355 PITTSBURGH,PA 15230-0355 h*hhS25EEEA !?ag
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1 UPDATE ON KEWAUNEE SLEEVING MARCH 1988 WISCONSIN PUBLIC SERVICE KEWAUNEE NUCLEAR POWER PLANT l
l AND l
WESTINGHOUSE ELECTRIC CORPORATION i
l ENERGY SYSTEM SERVICE DIVISION l
PITTSBURGH, PA.
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DEFINITIONS CORRECTIVE SLEEVE - SLEEVE INSTALLED IN A TUBE REQUIRING REPAIR AS DEFINED IN PLANT TECHNICAL SPECIFICATION BASED ON EXISTING TUBE DEGRADATION.
PREVENTIVE SLEEVE - SLEEVE INSTALLED IN A TUBE NOT REQUIRED TO BE REPAIRED BY TECHNICAL SPECIFICATIONS, BUT FOR POTENTIAL l
FUTURE TUBE DEGRADATION.
1 TUBE ROLLEp SECTION - ORIGINAL TUBE ROLL IS NOMINALLY
_IN LENGTH FROM THE TUBE END.
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TUBE ROLL TRANSITION - TRANSITION FROM ROLLED TUBE TO NOMINAL TUBE DIAMETER.
MEASUREMENT REFERENCE POINT TUBE ROLL TRANSITION - MEASURED FROM THE TUBE END TO THE TOP 0F THE ROLL TRANSITION BY EDDY CURRENT.
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TUBE TO TUBESHEET JOINT TUBE TO TUBESHEET WELD IS THE STRUCTURAL PRESSURE B0UNDARY BETWEEN THE TUBE AND TUBESHEET.
WELD IS ANALYZED WITHOUT TAKING CREDIT FOR TUBE ROLL.
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TUBE ROLLING PROCESS A TACK ROLL IS PERFORMED PRIOR TO WELDING TO PLACE TUBE IN CONTACT WITH TUBESHEET AND CLAD.
A TWO STEP HA_RD ROLL PROCESS IS USED TO OBTAIN A INCH LONG ROLL SECTION.
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soc FINAL RDLL FIRST RbLL
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W ELEVATION o
u AS DESIGNED TUBE TO TUBESHEET RDLL GEDMETRY
ADDITIONAL DEFINITIONS SLEEVE HYDRAULIC EXPANSION - SLEEVE IS HYDRAULIC EXPANDED INTO INTIMATE CONTACT WITH THE TUBE.
PLASTIC DEFORMATION OF UNEXPANDED]TUBEMATERIALOCCU
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NOMINALLYL
_ INCHES FROM THE SLEEVE END.
SoCre SLEEVE ROLL EXPANSION - FLAT AREA PRODUCED BY SLEEVE HARD ROLL IN TUBE, NOMINALLY [ [*'
INCHES FROM SLEEVE END.
MEASUREMENT REFERENCE POINT SLEEVE ROLL TRANSITION - MEASURED FROM THE SLEEVE END TO THE TOP 0F THE SLEEVE ROLL TRANSITION BY EDDY CURRENT.
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REFERENCE SLEEVE LOWER HARD ROLL PROCESS ASSUMPTIONS
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TUBE ROLLED SECTION IS A MINIMUM 0F_
INCHES IN LENGTH.
NO PLUGGABLE INDICATIONS EXIST IN THE TUBE IN THE SLEEVE ROLL EXPANSION REGION.
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Sleeve Lower Joint Configuration SLEEVE
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XISTING TUBE 4
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TUBESHEET HYDRAULIC j
EXPANSION l
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EXISTING TUBE ROLL ROLLED EXPANSION / /
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LOWER SLEEVE MECHANICAL JOINT ACCEPTANCE CRITERIA LOWER JOINT HYDRAULIC EXPAHSION HAS OCCURRED AND MEETS DIMENSIONAL REQUIREMENTS.
LOWER ROLL JOINT HAS BEEN PERFORMED AT PROPER TOOL TORQUE SETTING.
LOWER ROLL IS CONTAINED WITHIN THE SLEEVE HYDRAULIC EXPANSION REGION.
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VERIFICATION OF SLEEVE INSTALLATION LOWER HYDRAULIC EXPANSION EXPANSION CONTROLLER REGISTERS "SWAGE" LIGHT.
POST INSTALLATION EDDY CURRENT DIMENSIONAL DATA IS COMPARED TO ACCEPTANCE CRITERIA.
LOWER ROLL EXPANSION TOOL TORQUE IS PERIODICALLY EXAMINED ON A CALIBRATED TORQUE ANALYZER.
TOOL REGISTERS "TORQUE OUT" CONDITION.
POST INSTALLATION EDDY CURRENT DIMENSIONAL DATA IS COMPARED TO ACCEPTANCE CRITERIA.
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DISTRIBUTION OF TUBE ROLL TRANSITION ELEVATIONS IN STERM GENERATOR R
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/j 0.5 1.0 1.5 2.0 TUBE ROLL TRfNSITION HEIGHT
ISSUES THE EFFECT OF SHORT TUBE ROLLED SECTION ON THE REFERENCE SLEEVE LOWER ROLL EXPANSION PROCESS.
THE EFFECT OF TUBE DEGRADATION WITHIN THE REFERENCE SLEEVE LOWER ROLL EXPANSION
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J EDDY CURRENT DATA RESULTS 1.
THE SLEEVE LONG LOWER HARD ROLL HAS EXPANDED THE SLEEVE AND TUBE.
2.
THE SLEEVE MOUTH OF SOME ROLLS DID NOT REACH FULL ROLL DIAMETER.
3.
THE SHORT LOWER ROLL EFFECTIVELY FORMED THE SLEEVE MOUTH.
4.
NO INCREASE IN ROLL DIAMETER WAS SEEN BECAUSE OF THE SHORT ROLL.
CONCLUSION FROM EDDY CURRENT DATA 1.
LONG SLEEVE ROLL IS PRODUCING JOINTS OF UNIFORM DIAMETER WHEN COMBINED WITH SHORT ROLL PROCESS.
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This page is a reproduction of the output from the equipment used to analyze the eddy current tests.
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MODIFIED LOWER SLEEVE JOINT INSTALLATION PARAMETERS PURPOSE TO ADDRESS SITE CONDITIONS WHICH DIFFER FROM QUALIFICATION BASE OF REFERENCE JOINT DESIGN.
BACKGROUND THEREFERENCEJOINTDESIGNISBASEDON:-
[ INCH LONG HARD ROLLS IN THE BASE TUBE MATERIAL.
IN STEAM GENERATOR A THE TUBE ROLLS OCCUR AT APPR0XIMATELY lINCH.
boC THIS CONDITION WAS DISCOVERED DURING REVIEW 0F EDDY CURRENT DATA DURING S'.EEVING OPERATIONS.
SITE MEASUREMENTS (PRE-SLEEVING EDDY CURRENT)
WERE REVIEWED TO DETERMINE THE ROLL TRANSITION HEIGHT IN THE PARENT TUBE MATERIAL IN STEAM GENERATORS A AND B.
STEAM GENERATOR B HAD ONLY 5 TUBES WITH LOW TRANSITIONS, STEAM GENERATOR A i
HAD ALMOST ALL LOW TRANSITIONS.
NINETEEN TUBES DISPLAY INDICATIONS IN THESE LOW ROLL TRANSITIONS.
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LOWER JOINT VERIFICATION PROGRAM TEST SPECIMENS WERE MADE TO SIMULATE THE SITE CONDITIONS AND ARE BEING SUBJECTED TO TESTING.
SHORT TERM TESTING IS IN PROGRESS TO SHOW ACCEPTABILITY FOR UNIT STARTUP.
LONG TERM TESTING WILL BE PERFORMED TO
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SUPPORT ACCEPTABILITY FOR EXTENDED OPERATION.
FROM PAST DATA, THE SHORT TERM TESTS ARE INDICATIVE OF LONG TERM ACCEPTABILITY.
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TEST PROGRAM 18 SPECIMENS REPRESENTING 6 CONDITIONS 1.
NORMAL SLEEVE INSTALLATION IN A TUBE WITH A LOW ROLL.
2.
NORMAL SLEEVE INSTALLATION IN A TUBE WITH A LOW ROLL AND A FULL CIRCUMFERENTIAL SEVERANCE.
3.
SLEEVE WITH SHORT ROLL AT HIGH TORQUE IN A TUBE WITH A LOW ROLL.
4.
SLEEVE WITH A SHORT ROLL AT A HIGH TORQUE IN A TUBE WITH A LOW ROLL AND A FULL CIRCUMFERENTIAL SEVERANCE.
5.
SLEEVE WITH A SHORT ROLL AT LOW END OF TOLERANCE BAND OF PROP 0RTIONED TORQUE IN A TUBE WITH A LOW ROLL.
6.
SLEEVE WITH A SHORT ROLL AT A NOMINAL PROP 0RTIONED TORQUE IN A TUBE WITH A LOW ROLL.
LOVER ROLL TEST PROGRAM l
G e t - estfALL a b eef t 7 = M ft31 1 e t = m Ttti 2 t 8
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= PUDS att g g. m ft31 l
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- 1 - METALLOGRAPHY
- 2 - IN TEST 2
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- FATIGUE
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- 3 - IN TEST 1
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- PUSH QUT
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- 7 - IN TEST 1
- 8 - IN TEST 1 f
- 9 - IN TEST 1
- PUSH DUT l
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- 4 - IN TEST 3
- PUSH OUT 1
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- 5 - IN TEST 4
- 6 - IN TEST 4 I
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- 10 - IN TEST 4
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- 11 - IN TEST 4
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- 13 - IN TEST 2 i
- PUSH DUT
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- 14 - IN TEST 3
- PUSH OUT
- 15 - IN TEST 3
- FATIGUE vi i l a,c,e
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- 16 - IN TEST 2
- PUSH DUT
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- 17 - IN TEST 2
- PUSH DUT
- 18 - IN TEST 3
- FATIGUE b
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LOVER JOINT TEST ASSEMBLY END PLUG x
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SHORT TERM TEST PROGRAM ROOM TEMPERATURE LEAK TEST LEAK TEST AT_ ELEVATED _ TEMPERATURE a b,e r
THERMAL SOAK l
_ a,b,e a,b,e (AIR COOL)
I ROOM TEMPERATURE LEAK TEST LEAK TEST AT JLEVATER TEMPERATURE a,b,e 1
+---------- FATIGUE TEST I
PUSH OUT TEST l
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t This page is a tabulation of the results of the short term leak testing and push out tests.
The leak rates are given for room temperature and elevated temperatures before and after a thermal soak at elevated temperature. The push out loads are given for initial slippage and one inch of movement.
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1 TABLE 3.3.4.3-1 MAXIMUM ALLONABLE LEAK RATES FOR
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KEWAUNEE STEAM GENERATORS Allowable Leak Allowable Leak Condition Rate +
Rate per Sleeve' de Normal
.35 gem Operation (500 god)
Limitino Leak Rate Leak Rate eer Sleeve Postulated b d.e Accident Condition (Steamline Break)
Based on (2000]d e sleeves per steam generator.
Standard Technical Specification Limit for 1 steam generator.
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,') b, c. e The analysis assumes primary and secondary coolant initial inventories of IkC1/gm and 0.1HC1/gm of Dose Equivalent I-131, respectively.
In addition, as a result of the reactor trip, an todine spike is initiated which increases the lodine appearance rate in the primary coolant to a J
value equal to 500 times the equilibrium appearance rate.
3 38 468CM:19/103187-56
RESULTS OF ANALYSIS AND TEST CALCULATED LOADS:
b,C se NORMAL OPERATING =
-(end cap load)
STEAM LINE BREAK =
_(end cap load)
THEREFORE
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- 1. THE INCH EFFECTIVE ROLL DISPLACEMENT RES3TANCE COMPARES FAVORABLY WITH THE ORIGINAL SLEEVE HARD ROLL DESIGN.
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- 2. THE LOAD CAPACITY OF THE INCH EFFECTIVE ROLL EXCEEDS THE CALCULATED LOADS DUE TO NORMAL OPERATING AND STEAM LINE BREAK CONDITIONS.
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CONCLUSION FROM LEAK TEST AND PULL OUT TESTS 1.
LONG LOWER SLEEVE ROLL JOINT (BASE PROCESS)
PRODUCES ACCEPTABLE RESULTS WHEN APPLIED OVER LOW TUBE ROLL TRANSITIONS.
2.
THE SHORT LOWER ROLL PROCESSES TESTED PRODUCE ACCEPTABLE RESULTS AND CAN BE USED A STAND ALONE PROCESS.
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3.
THE ACCEPTABLE BEHAVIOR OF THE SHORT LOWER JOINT SHOWS THE FULL CONTACT AREA 0F THE BASE JOINT PROCESS IS NOT REQUIRED FOR ACCEPTABLE PERFORMANCE.
4.
THE SHORT OR BASE PROCESS '1S ACCEPTABLE TO APPLY OVER TUBING WHICH HAS EDDY CURRENT INDICATIONS AS LOW AS INCHES FROM THE TUBE END.
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CORROSION CONSIDERATIONS PREVIOUS CORROSION DATA APPLIES HYDRAULIC EXPANSION INSTALLATION PARAMETERS ARE UNCHANGED.
ROLL EXPANSION IS CONTAINED WITHIN THE HYDRAULIC EXPANSION REGION.
SHORT RER0LL IS APPLIED AT REDUCED TORQUE, 1
MAINTAINING CONSISTENT COLD WORKING AND STRAIN OF SLEEVE.
THERMALLY TREATED ALLOY 690 HAS SUPERIOR CORROSION RESISTANCE, PARTICULARLY WITH REGARDS TO PWSCC.
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l LONG TERM TEST PROGRAM FATIGUE TESTING WITH THERMAL CYCL,ltig
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HEAT TO
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[a,b,e EXTERNAL LOAD CYCLED LBS COMPRESSIVE *'
(RESULTS IN_ ACTUAL J6 INT LOADING 0F_
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_LBS TENSION TO COMPRESSION.
LOAD IS^>b>*
CYCLED AT~~
HERTZ
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_ FATIGUE CYCLES IBERMAL CYCLING _
b, e CYCLES (ROOM TEMPERATURE T0i s,.
ELEVATED TEMPERATURE PUSH OUT AND PULL OUT PUSH OUT AND PULL OUT MEASURED AT_
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t CONCLUSIONS 1.
THE BASE LOWER SLEEVE JOINT PROCESS IS l
STILL VALID WITH TUBES HAVING LOW ROLL TRANSITIONS AND CLEAN CREVICES.
l 2.
POST SLEEVE INSTALLATION EDDY CURRENT INDICATES THAT TUBES AT KEWAUNEE HAVE CLEAN CREVICES.
3.
THE BASE LOWER SLEEVE JOINT PROCESS IS EFFECTIVE WITH TUBES HAVING LOW ROLL TRANSITIONS WHICH DISPLAY INDICATIONS, AND CLEAN CREVICES.
. 4.
A MODIFIED LOWER SLEEVE JOINT PROCESS l
(HAVING A SHORTER ROLL ZONE)
IS EFFECTIVE IN TUBES WITH SHORT TUBE ROLLS ON A STAND ALONE BASIS.
t S?JETY EVALUATION i
The use of the modified lower sleeve joint does not have an adverse effect on the safe operation of the steam generator from the previously reviewed joint design.
The same design and acceptance criteria are used for structural integrity and leak tightness.
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The flow margin for nortnal operation and postulated accident conditions is not adversely effected.
Residual stresses in the sleeve transitions are the same of lower than the original design.
Inservice inspection capability and acceptance criteria are not adversely effected.
Technical Specification changes are not required.
_ _ _.__ - ~ -,.. _ - -.. _.. - _
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4 SAFETY EVALUATION The use of the revised lower sleeve joint is not an unreviewed safety question per the criteria of 10CFR50.59 The modification does not reduce the margin to safety, i
The modification does not increase the potential of a previously analyzed accident.
The analysis of a tube rupture accident bounds all possible hypothetical failures of a sleeve.
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