ML20062D622
| ML20062D622 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 05/31/1990 |
| From: | Palusamy S, Rice W, Strauch P WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19310C854 | List: |
| References | |
| IEB-88-008, IEB-88-8, WCAP-12646, NUDOCS 9011140077 | |
| Download: ML20062D622 (66) | |
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l l WCAP-12646 l 1 NRC BULLETIN 88-08 ! EVALUATION OF AUXILIARY PIPING
.FOR-SOUTH TEXAS PROJECT-UNITS 1 and 2
-i May 1990 i
P. L. Strauch D. M. Scantiin Reviewed By: A[8M D. H. Roarty (/ Structural Mechanics and Diagnostics Technology. Approved By: I. .dO#-yW Approvedby:ld(Nikth
- 5. 5.f alusamy P ' W. R. Rice Structural. Mechanics and Chemical,' Waste .
Diagnostics Technology and B0P Systems -
- Work Performed Under Shop Order TMXP-961 and- ,;
' Filed Under TGX-964/12 !
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WESTINGHOUSE ELECTRIC CORPORATION Nuclear and Advanced Technology Division' ' P.O. Box 2728 Pittsburgh, Pennsylvania 15230-2728 _ e 1990 Westinghouse Electric Corp. 1 1
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i Table of Contents' i Section Title Page-
.i 1.0 EXECUTIVE
SUMMARY
1-1
2.0 BACKGROUND
AND INTRODUCTION 2 3.0 CHARGING AND AUXILIARY SPRAY-SYSTEM REVIEW 3-1 4.0 CHARGING AND AUXILIARY SPRAY SYSTEM EVALUATION- 4-1 5.0 SUPPLEMENT 3 REVIEW 5-1 ! 6.0 INSERVICE INSPECTION RECOMMENDATIONS 6-1 i 7.0 MONITORING DATA EVALUATION 7-11
8.0 REFERENCES
8-1 ; APPENDIX A-1 l l i s ca.,omm o 4
l SECTION 1.0 EXECUTIVE
SUMMARY
! This report provides an evaluation of the South Texas Project Electric Generating Station Units 1 and 2 normal charging, alternate charging and auxiliary spray lines for the effects of potential thermal stratification and cycling resulting from isolation valve inleakage into the Reactor Coolant System, as described in NRC Bulletin 88-08 (Ref.1). This evaluation-includes the development of a bounding transient and calculation of the effect of this-transient on the integrity of the unisolable piping (i.e. the sections of piping between the Reactor Coolant System, or normal spray line, and the immediate upstream check valve). Monitoring' data from Unit 2 is included in the appendix and evaluated in Section 7.0. Also included is a review of l potential outleakage paths from the Reactor Coolant System into auxiliary l piping, as described in Supplement 3 of Ref.1, in order to identify susceptible systems. . The result of this evaluation is that the normal charging, alternate charging and auxiliary spray line integrity would not be jeopardized, should inleakage into the Reactor Coolant System occur over the life of the units. The design margins as calculated in the original design stress analysis are unchanged for the three lines. Temperature monitoring of these lines may discontinue. Inservice inspection, with a frequency consistent with the standard ASME' Section XI recommendations (10 years) is recommended at the locations provided in this report. The monitoring data shows that stratification is occurring, but thermal cycling is not occurring. The observed stratification is bounded.by the ,
- Section 4.0 evaluation.
- No systems were considered to be susceptible to adverse thermal stresses i resulting from outleakage from the Reactor Coolant System, with the exception of the residual heat removal lines which have been previously evaluated-(see Ref. 5). The pressurizer surge lines have also been evaluated in Ref. 5, per NRC Bulletin 88-11.
4 me,,97un m 1-1
L , SECTION 2.0 , BACKGROUND AND INTRODUCTION' l Following the discovery of pipe cracks in the auxiliary lines of several , commercial nuclear power plants, the United States Nuclear Regulatory l l Commission issued Bulletin 88-08 (Ref. 1). Action Item 1 of the Bulletin requested utilities to identify unisolable piping-connected to the Reactor Coolant System (RCS) which are ausceptible to adverse' temperature distributions (not considered in the design analysis of the piping) that could be induced by leakage through isolation valves into the RCS (inleakage). . Three systems were identified for South Texas Project Units 1 and 2: normal charging, alternate charging, and auxiliary spray.(Ref.'2). The unisolable piping sections for these lines include the segments between check. valve- - XCV0001 and the RCS loop 1 cold leg; between check valve XCV0004 and the RCS loop 3 cold leg; and between check valve XCV0009 and the connection to the normal spray line, as shown in Figure 2-1. Action Item 2 of Bulletin 88-08 requested that the identified unisolable-piping be nondestructively exainined to provide assurance. that .there are no existing flaws. Figures 2-2, 2-3 and 2-4 identify locations that have been inspected. No indications were found. Recommendations for additional' inspection (in lieu of temperature monitoring) are included ~in Section 6.0 based on analysis of a bounding inleakage transient loading. Action Item 3 of the Bulletin requested that a program be implemented to provide continuous assurance that adverse. temperature. distributions are not occurring in unisolable piping. sections. Accordingly, Houston Lighting and Power Company :nstrumented the susceptible piping-at South Texas Project Units 1 and 2 with surface-mounted temperature sensors at the locations shown ! in Figures 2-5, 2-6 and 2-7. Monitoring data from the period 2/12/89'through 3/24/89 for Unit 2 are included in the appendix. An evaluation of this data [ is provided in Section 7.0. ms.mvwa 21 i i . ~ - . . 4
l \ With the discovery of a crack in the residual heat removal suction line at Genkai Unit 1 in June 1988, attention has' been focused on the possibility of .! pipe cracking as a result of leakage from the RCS into auxiliary piping (outleakage). This led to the issuance of Supplement 3 to NRC Bulletin 88-08. Section 5.0 addresses Supplement 3 concerns for South Texas-Project Units 1 and 2. j
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RCs Coto LEG XCV0005 XCV0004 Loor 3 ALTERNATE-
, CHARGING-LINE Figure 2-1. South Texas Project Units 1 and 2 Charging and
. Auxiliary Spray Systems
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Isometric Drawing IC369PRC457, Rev. 8. Sheet 5 i O L
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Isometric Drawing IC369PRC457. Rev. 8, Sheet 6 Figure 2-4 Auxiliary Spray-Line Current Inspection Locations
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2-9
1 I I SECTION 3.0 CHARGING AND AUXILIARY SPRAY SYSTEM REVIEW
, In general, adverse thermal stresses in unisolable piping, as described in the ;
subject NRC Bulletin, can occur whenever the connected piping is isolated by a-leaking isolation valve, the pressure upstream of the leaking valve is greater , than the RCS pressure (nominally 2250 at the Pressurizer) and the temperature of the leaking fluid is significantly cooler than the RCS temperatures. The only pressure source available in the South Texas auxiliary piping which fits this criteria is the charging system. During normal conditions, the pressure at the discharge of the charging pumps is approximately 2700 psig.- 1 Lines of potential concern identified include the auxiliary spray line, the normal charging line and the alternate charging line. , The temperature at the regenerative heat exchanger outlet is 530*F for-normal charging conditions and 477'F for maximum charging conditions. For the 4 following evaluation, maximum charging conditions are used since this results in a greater stratification temperature difference inithe unisolable piping. 3.1 Normal Charging Line There are two charging paths provided in the South Texas Project design. The first is the normal charging path to the cold leg of reactor coolant loop,1'; the second is the alternate charging line connected to the cold leg of~ loop 3 (see Figure 2-1). At any time, one of the charging lines will be in service with the other valved out. Per the Precautions, Limitations and Setpoints
. document, "Use of the normal charging line and the alternate charging line '
should be alternated over the plant life, such that neither' path will be exposed to more than-60% of the design transients involving stoppage of letdown and/or charging." ca.awmo 3-1
?
l Under the maximum charging conditions, the temperature upstream of closed valve XCV0003 is approximately 477'F based on the regenerative heat exchanger 3 outlet temperature. Point A in Figure 2-1 represents the junction of auxiliary spray, charging and alternate charging lines, and the temperature at this point is the heat exchanger outlet temperature. Since there is. approximately 80 feet of stagnant pipe length between point A and the 1 unisolable piping when the normal charging line is isolated, it is possible that any leakage may cool significantly, depending on leakage flowrate and insulation characteristics. This is evaluated in detail in Section 4.0. 3.2 Alternate Chargina Line The second charging path provided on the South Texas design is the alternate charging line. ' The temperature upstream of closed valve XCV0006 is approximately 477'F based on the regenerative heat exchanger outlet temperature for maximum charging conditions. Point A in Figure 2-1 represents the junction of auxiliary spray, charging and alternate charging lines, and the temperature at this point will be at the heat exchanger outlet temperature. Since there is approximately 105 feet of stagnant pipe length when the alternate charging line is isolated, it is possible that any leakage in the piping up to check. valve XCV0004 may cool significantly, depending on leakage flowrate and insulation characteristics. Another potential inleakage path exists for the alternate charging lines. As a means to relieve excessive pressure which could potentially occur when the normal and alternate charging line isolation valves (XCV0003 and XCV0006, respectively) are closed, a bypass line has been included in the design of the-alternate charging line (see Figure 2-1). The design of this bypass line ' includes a spring loaded check valve (CV0007) which would open at a set pressure differential; however, during normal charging operation, with { alternate charging isolated, no flow would pass through the bypass line. The spring loaded check valve called for in the system design was not installed; rather a lift check valve is in place. The effect of this m e. m a.a " 3-2
configuration is to admit a constant bypass flow around isolation valve XCV0006 and into the Reactor Coolant System. Since the regenerative heat exchanger outlet temperature is somewhat cooler than the Reactor Coolant -i System temperature, thermal-stratification and/or cycling are possible in the . unisolable piping -(i.e., between check valve XCV0004 and the Reactor. Coolant System). These effects are evaluated in detail in Section 4.0. l 3.3 Auxiliary Spray Line 4 Figure 2-1 depicts the auxiliary spray line from the outlet of the i regenerative heat exchanger to the connection with the normal spray line. During normal operation, the auxiliary spray'line is isolated from the l charging header via valve LV3119. Valve LV3119 is.a 2 inch air operated globe valve. The downstream check valve XCV0009 is 2 inch lift check valve. The temperature at the regenerative heat exchanger outlet is 530'F for normal charging and 477'F for maximum charging, however the temperature _of.any leaking fluid into the RCS may be substantially less depending on: leakage , flowrate and insulation characteristics. Based on the piping-configuration, the total length of 2 inch piping is approximately 180 feet up-to check valve XCV0009 (see Figure 2-1). See Section 4.0 for evaluation of potential leakage i effects on the auxiliary spray unisolable piping. Examination of the layout illustrates that the proximity of the check valve ! XCV0009 to the normal spray line with no risers or cold traps suggests that the temperature in the piping downstream of check valve XCV0009 will'be nearly at the normal pressurizer spray temperature.- The normal spray line is in service at all times, but typically at reduced flow rates to prevent thermal shock to the pressurizer. Therefore, some cooling-may occur in the spray line. Hence, it is estimated that the spray line temperature will be somewhere between the cold leg temperature of 560*F and the low temperature alarms on TE 605 and TE 606 of 530*F.
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3-3
.__________---_--2
SECTION 4.0 CHARGING AND AUXILIARY SPRAY SYSTEM EVALUATION This section describes the heat transfer and stress analyses performed.in order to evaluate the effect of potential isolation valve inleakage'on the j unisolable sections of the charging, alternate charging and auxiliary spray-lines. > 4.1 Determination of-Inleakage Temperature -! In the event that inleakage were to pass through the charging, alternate charging or auxiliary spray isolation valves-(XCV0003, XCV0006 or LV3119, [ respectively), the leakage could cool.significantly.as it flowc toward:the unisolable piping sections, depending primarily on the' leakage flowrate, , insulation thermal conductivity and the distance, required for.the leakage to travel. This distance is approximately 80 feet,105 feet and 180' feet for'the normal Jarging, alternate charging and auxiliary spray-lines, respectively. I The maximum potential stratification temperature difference exists under j maximum charging conditions, when. the temperature at the. regenerative heat exchanger outlet is lowest (477'F). Assuming an ambient temperature of'100'F,. heat transfer calculations were performed to determine the. temperature of the leakage as it enters the unisclable piping. This is-shown as a function of' leakage flowrate in Figure 11. At higher leakrates, the leakage enters the unisolable piping at hight. temperatures (approaching the regenerative: heat exchanger outlet temperr.ture), and the potential for adverse thermal stress, decreases. Therefore, only a narrow range of leakage flowrates is potentially detrimental to piping integrity. 432es/04U9010 g l
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_ a,c.e Figure 4-1. Leakage Temperature As It Enters-the'Unisolable- ' Piping Vs. Leakage Flowrate-ua.minc io 4-2
l 1 4.2 Determination of Stratification Temperature Difference The temperature of the postulated leakage, as it enters the unisolable piping ; is shown in Figure 4-1, as a function of leakage flowrate. Given a leakage
, temperature and flowrate at the entrance to the unisolable piping, the l top-to-bottom of pipe temperature difference may be calculated (
-i la,c.e was calculated, based on the expected leakage temperatures.
Leakage depths up to [ Ja,c.e and leakage flowrates up to (
']a,c,e are included in this evaluation. This bounds all plausible leakage conditions. Figure 4-2 is a plot of the top-to-bottom fluid temperature difference as a function of distance into the unisolable piping.
Leakage flows less than ( Ja,c.e are considered-incapable of producing adverse piping stresses, (:' Ja,c.e Leakage flows greater than [ .- la c.e result in insignificant temperature gradients, since the leakage enters the unisolable piping at essentially the regenerative heat exchanger outlet temperature. -Therefore, only a narrow
. range (- la,c.e of leakage flowrate is capable of producing temperature differences within the unisolable piping sections .
- sufficient to yield adverse thermal stresses.
4.3 Finite Element Stress Analysis of Stratified Leakage Flow A thermal stratification loading will typically have two stress effects on piping, a " local" effect and a " global" effect. Local stresses may be obtained by modeling a section of the pipe without end restraints and imposing 4326s/062790 10 43
-1 bnd' the circumferential thermal gradients defined by-the stratified fluid-temperatures. Without end restraints, the piping will " bow", and the resulting radial, circumferential and axial stresses are defined as local stresses.
Global stresses result from the effects of not allowing the pipe to " bow" as it would in the unrestrained condition. This restraint results from piping supports and the piping itself. Vertical rigid supports are typically detrimental to global stresses since thermal stratification -loadings tend.to displace the piping primarily in the vertical direction. Leakage depth and i the extent of stratified pipe are also significant in the determination of , global piping stress. A leakage depth up to the pipe centerline will maximize global stress. Also, glooal stresses will typically increase as the length of ; stratified piping increases. ! Based on the expected shallow depth and extent (see Figure 4-2) of stratified flow, and the support configuration of the charging, alternate charging and auxiliary spray lines, global piping stresses are assumed negligible, , In order to determine the magnitude of local stresses resulting from the. postulated stratified leakage, the thermal distribution within the pipe must be resolved. This was done using a 20 model of one-half of the pipe cross section (using symmetric boundary conditions for nodes on the plane of-synmetry). This model was conservatively applied to the charging, alternate charging and auxiliary spray lines. The Westinghouse general purpose finite-element program WECAN (Ref 3) was used to solve for. the thermal distribution, loading the 20 isoparametric heat transfer elements with temperature on the inside surface of the pipe, as shown in Figure 4-3. 'The piping and water-were assumed uniformly hot-(560*F) initially,' ramping to the fluid temperature distribution shown in Figure 4-3 over a ( la,c,e period.. The resultant steady state temperature distribution is shown in Figure 4-4. The local stresses for the postulated leakage were obtained by replacing the heat transfer elements used in the thermal analysis model with 2D isoparametric ( la.c.e elements,-and loading the model with nodal temperature input from the thermal analysis. As shown in mwowso io 4-4
i j ." i- , Figure 4-5, the piping stress intensity peaked at ( Ja,c.e for a stratification temperature difference of ( ]j ja.c.e . Figure 4-6 is a plot of maximum stress intensity and [ ' ja.c.e-4.4 Fatigue Evaluation of Stratified Leakage Flow i In order to perform a fatigue evaluation of the postulated inleakage on- the charging, alternate charging and auxiliary spray lines per ASME requirements (Ref. 4), the alternating stress intensity and number of occurrences are ' required. I
~!
For this evaluation, a maximum stratification temperature difference of l [ la.c.e is used, based on the minimum leakage flowrate considered (see Figura4-2). The peak stress intensity range (S p ) is calculated by the following relation: y [ ja c.e where K 3 is the local stress index for the specific component under investigation and the stratification AT is obtained from Figure 4-2 for the specific location. The maximum peak stress intensity range [ ]a,c.e - . occurs at the ( Ja.c.e since the maximum-stratification ai (- Ja,c.e and maximum K3 value [ ]a,c.e occur at these locations. The alternating stress intensity, Salt, is calculated by equation 14 of reference 4: Salt " KeSp/2 where K, = 1.0, provided the primary plus secondary stress intensity range (Sn ) is less than 3.0 times the design stress intensity (S ,). The minimum design stress intensity for the materials under consideration (304, 316 and 316L stainless stee'.) is 13.86 ksi at 560*F. The maximum unintensif.ied m e. m m aio 4-5 l l
l P l l thermal stress is [ ' la.c.e ksi. (
! )"'C therefore a
} conservative S stress would be approximately ( )"'C ksi. Since S n ( )"' is less than 3.0 S, (41.58 ksi), K, = 1.0. . The maximum S alt is therefore ((:.. The S alt and hence allowable cycles determined are consFrvatively applicable j to the charging, alternate charging and auxiliary spray lines. f for the normal and alternate charging lines, the [ Ja.c.e are approximately 20 pipe inside diameters from the RCS ce aection. ( ! Ja c.e Therefore, the incremental fatigue usage for the postulated isolation valve leakage in the charging and alternate charging lines is conservatively estimated to be less than 0.001 over the design life of the Units,( Ja.c.e and continuous isolation valve leakage at the worst leakage flowrate. l l At other locations within the normal and alternate charging line unisolable piping ( Ja,:,e alternating stresses are below the fatigue endurance limit based on 10 11 cycles. l Typically, the normal spray line is operated with a small flow in order to prevent thermal shock to the pressurizer. ( t - , Ja.c.e Therefore, the incremental fatigue usage for l me.w o io 46
1 1 postulated isolation valve leakage in the auxiliary spray line is. conservatively estimated to be less than 0.03 over the design life of the L Units, assuming continuous isolation valve leakage at the worst leakage - flowra te, i 0 4.5 Conclusions ! Since the incremental fatigue usage factors calculated for the normal charging, alternate charging and auxiliary spray piping are negligible, it is ; concluded that piping integrity would not be jeopardized, should inleakage , occur over the life of the units. The design margins as calculated in the original design stress analysis are unchanged for the three lines. Temperature monitoring of these lines may discontinue, provided periodic
'nearvice inspection is performed with a frequency consistent with the sandard ASME Section XI recommendations (10 years). See Section 6.0 for i specific recommendations.
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- SECTION 5.0 SUPPLEMENT 3 REVIEW j
. This section provides a review of potential outleakage paths from the RCS which are susceptible to adverse thermal stresses. The residual heat removal >
suction lines are not included in this review since they were evaluated in i Reference 5. 5.1 System Leakage Flow Paths Each potential outleakage path from the RCS is discussed on a system basis below. 5.1.1 Reactor Coolant System Reactor Vessel Head Vent. Attached to .he reactor head is a 1-inch vent line. Leakage through this line is prevented by 4 normally closed solenoid operated globe valves in a 2x2 series / parallel arrangement followed by clhss 2 closed globe v61ves. Surge Line. This'line is the subject of NRC Bulletin 88-11 (Ref. 6) and has been addressed in Ref 5. ' Spray Line. There is a continuous reduced flow through this line to prevent thermal shock to the pressurizer during spray operation. l A 6-inch line from the pressurizer leads to the power operated relief valves (PORV's). The line is isolated by the 3-inch normally closed globe valves (PORV's), each in series with a normally open, remote, manually controlled MOV gate valve. The valves have an upstream water seal against the pressurizer steam, l r A 6-inch line from the pressurizer leads to each of the pressurizer safety , l valves. The safety valves provide the class 1 pressure boundary. Each valve has an upstream water seal. Each loop seal has a 3/4-inch drain line which is-
- class 2 since the pipe ID acts as a restrictor.
m a m oio 5-1
I 5.1.2 Chemical and Volume Control. System i Connected to loop 3 RCS crossover leg is a 4-inch line for CVCS letdown. This line is normally in service, with flow to the CVCS, and is isolated by two motor operated valves (in series) which close automatically on low pressurizer level. Upstream of the two MOV's is a normally locked open, 4-inch manual gate valve. Connected to the 4" line upstream of all three valves is a 2-inch drain line which is isolated by two normally closed manually operated globe valves in series. Connected to loop 4 RCS crossover leg is a two inch line for CVCS excess letdown. The line is isolated by two normally closed (in series) motor operated globe valves. Upstream of the two MOV's is a normally locked open 2-inch globe valve. Connected to the 2-inch line upstream of all three valves is a 2-inch drain line which is isolated by two normally closed manually operated globe valves in ser,ies. Connected to loop 1 cold leg is a 4-inch line for CVCS normal charging. The line is isolated by two 4-inch check valves in series to provide the class 1 to 2 boundary when the line is taken out of service. Flow though this line or. , the alternate charging line (whichever is in service), negates outleakage consideration for the line in service. This line has been evaluated for
- potential inleakage (see Section 4.0). .
Connected to loop 3 cold leg is a 4-inch line for CVCS alternate charging which is used as an alternate to the normal charging line. The line is isolated by two 4-inch check valves in series' to provide the class 1 to 2 i boundary. Either flow through the line (if in service) or charging header pressure negates outleakage consideration. This line has been evaluated for potential inleakage (see Section 4.0). Connected to the normal spray line is a 2-inch auxiliary ~ spray line. This f line is isolated by a check valve and a normally closed 2-inch air operated globe valve. Charging header pressure negates outleakage consideration. This l line has been evaluated for the effects of potential inleakage (see. *
.Section 4.0).
.n..mmo in 5-2
l l i Connected to each Reactor Coolant Pump No. 1 seal injection connection is a 2-inch line. This line is isolated by two check valves in series. The line
- is normally in operation to provide flow to the No. 1 seal, therefore outleakage is not a concern.
5.1.3 Safety injection System Connected to the cold legs of 3 loops is a 12-inch connection from the safety injection (SI) system which provides residual heat removal return, Si cold leg recirculation and high head safety injection (HHSI), low head safety injection , (LHSI) and accumulator injection. Isolation is provided by a 12-inch check valve in series with: o another 12-inch check valve to prevent leakage to the SI accumulator o a 10-inch check valve to prevent leakage to the RHR, HHSI or LHSI . o a 3/4 inch normally closed air-operated globe valve which serves as ' a test line for evaluating the performance of the check valves. _The test line piping and 3/4-inch valve are class 2, since a flow restrictor is provided. Connected to the hot leg of 3 loops is an 8-inch connection from the SI system which provides LHS! and HHSI' injection during SI hot leg recirculation. Leakage is prevented by an 8-inch check valve in series with: t o a 6-inch check valve (followed by a normally closed 6-inch class 2' motor operated gate valve) in the line to the HHSI pumps. o a 3/4-inch normally closed air operated globe valve which serves as a test line. The piping and 3/4-inch valve are class 2 since a flow restrictor is provided. o an 8-inch check ve.lve (followed by a normally closed 8-inch class 2 gate valve) in the line to RHR/LHSI. '
'"***1' 5-3 i
I 5.1.4 Waste Disposal System Connected to the crossover leg on loops 1 and 2 is a 2-inch drain line. The line is isolated by two normally closed 2-inch manual globe valves. Connected between the valves through a flow restrictor on the loop 1 drain line is a class 2 line (3/4-inch) for refueling level measurement. The refueling line is isolated by a normally closed manually operated globe valve. Drain lines for loops 3 and 4 are the CVCS letdown and excess letdown lines and are discussed under the chemical and volume control system. 5.1.5 Sampling System Attached to the hot legs of loop 1 and 3 is a 3/4-inch line. This line feeds through a normally open manually operated class 2 globe valve to the sampling system. The line is class 2 at the RC connection since the line 10 is equivalent to a flow restrictor. A 3/4-inch line attached to the pressurizer PORV relief line permits sampling pressurizer vapor. The class 1/2 boundary is at the connection to the relief line since a flow restrictor is used. A 3/4-inch line attached to the pressurizer permits sampling pressurizer liquid. The class 1/2 boundary is at the connection to the pressurizer since a flow restrictor is used. l 5.2 Outleakage Potential and Conclusions-l l l Outleakage potential was evaluated on the following bases: l i o ( jace l o ( 3a,c.e 4 4326s/M279010
$.f
l g )a,c.e o (
.ja.c.e i ,
ja,c.e t Tabla 5-1 provides a summary of the isolation schemas and outleakage potential for susceptible lines. The Si lines to the cold and hot legs are considered most vulnerable to outleakage, since ( < la.c.e However, since there are at least [
, ja.c.e outleakage is highly unlikely. In the remote event that outleakage were to occur,(
.]a c.e and the effect on piping integrity would be negligible. it is therefore concluded that no systems at South Texas Project Units 1 and 2 are susceptible to fatigue failure resulting
- from isolation valve leakage, with the exception of the residual heat removal suction lines, which worr, previously evaluated. ,
4 4 G G
- j. m mn.o io 5-5 l-
i . Table 5-1
- Isolation Scheme Summary and Leakage Potential Connection Description Isolation Scheme Leakage Potential a,c.e ;
RV Head Vent 3 normally closed 1" globe
. valve.
Spray Line None. Constant reduced flow. PORV's 3" globe valve with water seal, i Pressurizer Safety 6" safety valve with water seal. Letdown Two motor operated 4" valves when not in service.
- Excess Letdown Two motor operated 2" valves when not in service.
Normal Charging & Two 4" check valves when not Alternate Charging in service. Auxiliary Spray Check valve and air operated globe valve, both 2". RCP Seal Injection None. Normal operating path. SI to Cold legs M" check valve in series with i another 12' check valve, another 10" check valve, or a 3/4" air operated globe valve. SI to Hot legs 8" check valve followed by
. either a 6" check valve and a 6" gate valve; an 8" check valve and 8" gate valve; or a 3/4" air operated globe valve.
Orain Two 2" manual globe valves. Sampling Lines None. 'Flowpath remains open for sampling. i m m aio 5-6
i SECTION 6.0 i INSERVICE INSPECTION RECOMMENDATIONS
. The effects of potential isolation valve inleakage have been evaluated on the unisolable portions of the normal charging, alternate charging and auxiliary spray lines in Section 4.0. The result of this evaluation is that the contribution to fatigue usage would be negligible, should leakage occur over I the life of the units. Based on this evaluation :.nd the review of the monitoring data from these lines, it is recommended that monitoring of the >
Units 1 and 2 charging, alternate charging and auxiliary spray lines discontinue, and a program of periodic inservice inspection be implemented. The frequency for this inspection should be consistent with the standard ASME- ; l Section XI recommendations (10 years). Future industry efforts may justify less frequent inspections. Further details for inspection are included in the following subsections. 6.1 Inspection Locations In the unlikely event that isolation valve leakage at a flow rate capable of . producing adverse thermal stresses (see subsection 4.2) were to occur, the components considered most susceptible to these stresses would be near the (- Ja,c.e where the stratification is expected to be most severe (see Figure 4-2). As explained in section 4.0, ( )"'C thus reducing the stratification temperature difference. The previously recommended inspection locations for the normal charging line
- are shown in Figure 2-2. Based on current understanding of turbulent flow
, penetration, it is expected that this area would not be susceptible to thermal
- fatigue resulting from velve leakage, since (
i i m.._,,,, 31 ! 1
, l
i 8 'C 1 This mixing would result from a combination of loop turbulence ; and dispersion of the leakage flow in the 15 inch long vertical section of piping. Recommended locations for inservice inspection on the normal charging-line are shown in Figure 6-1. Inspection locations on the alternate charging line were previously recommended as shown in Figure 2-3. Recommended locations for inspection (provided in Figure 6-2) include an additional elbow weld and the downstream weldonthegheckvalve. The elbow base metal has been excluded as a recommended location. Figure 2-4 identifies previously recommended inspection locations on the auxiliary spray line. Again, the most critical locations are determined to be [ Ja.c.e The locations shown in Figure 6-3 are therefore recommended for inspection. 6.2 Recommended Inservice Inspection Method To successfully detect indications initiating at the 10 of the welds identified in Figures 6-1, 6-2 and 6-3, the ASME Section XI UT examination should be augmented by special procedures, as per Supplement 2 of Ref.1. Based on the examinations performed at Farley Unit 2 on the cracked safety injection lines and examinations with similar materials and gecmetries, the supplemental examinations given below were suecassfully used to detect the through-wall indication in the Farley Unit 2 line. As shown in Figure 6-4, the examination volume extends 0.25 inch on each side of the weld. The ASME Section XI UT examinations should be performed augmented by the specifications required for the safety injection line welds. These examinations should consist of: m . m m oio 6-2
l
)
A 45 degree refracted shear wave examination using a 2.25 MHz, 0.5 to I l 0.25 inch diameter transducer, calibrating out to a one and one-half vee examination (see figure 6-4) for all of the welds. A 1.5 MHz transducer , may be used, however, the higher frequency transducer will result'in better resolution. An additional 60 degree refracted shear wave examination using a 0.50 to 0.25 inch diameter,1.5 MHz transducer, calibrating out to a one and l one-half vee examination for all of the welds. The reference reflectors used for these calibrations are I.D. and 0.D. notches. Typically during these calibrations, the 1/2 veo notch response is the refloctor providing the strongest signal response. Thir. signal is then set to 80*'. of full screen height. The gain needed to' establish this amplitude response is then referred to as the reference sensitivity. Amplitude respenses from the full vee notch response and the 11/2 veo notch response are then rer.orded. Connection of the three points (0.5 one half, full and I 1-1/2 vee responses) on the cathode ray tube of the ultrasonic test instrument will then define the distance amplitude correction (DAC) curve. Scanning sensitivities should be at 14 dB above reference sensitivity with a , noise level of less than 10% full screen height for the 45 and 60 degree examinations. If the noise level exceeds the above limit. -the scaening i sensitivity may be reduced in one dB increment until the noise level drops to below the above level. This reduction should be recorded on the applicaole data sheet. All indications should be recorded and evaluated that traveled in time, are not attributed to component geome.try and have an amplitude of greate'r than or equal to 20% of the distance amplitude correction curve. If any indications or suspoct indications are detected during the above examinations, it is recommended that s'upplemental radiographic examination of that weld be performed, s
.n , ann ia 6-3
6.3 Inservice Inspection Acceptance Criteria The acceptance criteria to be used are those of Paragraph IWB-3514.3, Winter 1987 Addendum to the 1986 ASME Boiler and Pressure Vessel Code, Section XI. If the piping contains a flaw exceeding the allowable flaw standards of IWB-3514.3, then the piping may be evaluated to determine its acceptability for continued service in accordance with the evaluation procedures and acceptance criteria of IWB-3641 or IWB-3642 subject to the restrictions thereon. l l e l l l l i e326e/06279010
5 CV0001 o -- Figure 6-1, Recommended Normal-Charging Line Inspection Locations m e.mi m e 6-5
1
=
CV0004 ! Y s Figure 6-2. Recommended Alternate Charging Line Inspection. Locations; en m i m io 16-6
t
's 009 o
s. Figure 6-3. Recommended Auxiliary Spray line Inspection Locations 4n mi o i. 6-7 in . .a.. . . , ,
Profile of weeve leesy, weseel measle, or
% saem. ourtees _p pump eonnection
-+ in in. ~ -. i n in. -
j
== enmen,ine A
P' m e a a.,e 04:
> s
( c 6- h O o ,
'a' m ..
... . t ,
I i/4 ia. --+ +* + v4 in. \ b c'.'o".' *I,
- toi w e > 4 in.
Figure 6-4. Examination Areas for Volumetric Inspection of Piping Welds (from ASME Code, Section XI,'.1986 Edition, Fig. IWB'2500-B)
.nwonisc io ,
6-8 .
SECTION 7.0 WONITORING DATA EVALUATION Appendix pages A-2 through A-18 contain data plott of temperature vs. time for the normal charging, alternate charging and auxiliary spray lines from the NRC Bulletin 88-08 monitoring program on South Texas Project Unit 2. These plots were extracted from the entirety of the monitoring data since they appeared to contain potentially significant thermal activity. This section provides an evaluation of this data. 7.1 Expected Monitorina Tomoeratures The normal charging line monitoring location is approximately two feet from the RCS. cold leg connection (see Figure 2-5). Temperatures at this location are expected to be approximately the RCS temperature when the line is isolated, and approximately charging flow temperature (as measured by TE0126 near the outlet of the regenerative heat exchanger) when the line is in service. The alternate charging line monitoring location is about four feet from the RCS cold leg connection (see Figure 2-6). Temperatures at this location are expected to be approximately the RCS temperature when the line is isolated, and approximately charging flow temperature when the line is in service. It should be noted that the potential exists for continuous inleakage since the alternate charging isolation valve bypass line has a lift check valve installed in place of a spring loaded check valve called for in the system design (see Section 3.0). The auxiliary spray line monitoring location is at the 3" weld on the 6" x 6" x 3" reducing toe which connects the auxiliary spray line to the normal spray line (see Figure 2-7). The normal spray line is kept hot by a reduced flow on.=nw a 71
,, , . . - - . . . - w--
from the RCS co'd legs to prevent thermal shock to the pressurizer during spray operation. Therefore, temperatures at +he monitoring location are expected to at approximately the RCS cold leg temperature.
- 7.2 Monitoring Data Summary The monitoring data used in the evaluation of the charging, alternate charging and auxiliary spray lines was taken during a period from 2/12/89 through 3/27/89. In addition to the temperature monitoring data, supplemental plant data was used in the evaluation, including RCS temperature, regenerative heat exchanger outlet temperature, charging and alternate charging isolation valve position indications and charging flowrate. A summary of significant plant activity is included in Table 7-1 as a means to explain the monitoring data events.
7.2.1 Normal Charging Line The monitoring data for the normal charging line shows only one occurrence of significant thermal stratification. This occurred from 22:00 to 23:40 on 3/22/89. The outside wall temperature difference reached 240'F during this period. From plant records, it was confirmed that a test was conducted at this time in which the Reactor Coolant Pumps were stopped. The remaining monitoring data for the normal charging line shows no significant thermal activity other than design transients (e.g., charging / letdown flow changes), which have been considered in the design analysis. 7.2.2 Alternate Charging Line
- The alternate charging line monitoring data shows continuous thermal stratification while the line was isolated. This is most probably the result of bypass flow around the alternate charging isolation valve, since a lift check valve was installed instead of a spring loaded check valve. The maximum outside wall temperature difference seen in the monitoring data is about 140'F.
m .,m m eio 7-2
7.2.3 Auxiliary Spray Line The auxiliary spray line monitoring data shows continuous stratification of approximately 30*F throughout most of the monitoring period. Thermal cycling,
. however, is not occurring.
Temperature excursions to 645'F occurred four times and are attributed to tests in which the Reactor Coolant Pumps were stopped, thus creating a pressure differential which is believed to have forced pressurizer. steam into the normal spray piping. 7.3 Monitorino Data Conclusions The normal charging line monitoring data shows no indications of thermal stratification, except during a test period when the temperature difference reached 240*F. Since the stratification temperature difference is noneyclic and is less than that evaluated in Section 4.0 of this report, and since the transient occurred as a result of a test (a limited number of such transients is expected over the plant life), the effect on piping integrity is negligible. The alternate charging line data shows continuous stratification throughout most of the monitoring period, which is attributed to bypass flow around:the isolation vahe. The maximum outside wall temperature difference seen in the monitoring data is about 140'F. Since this is less than the value used in the Section 4.0 evaluation, and since thermal cycling is not occurring, the'effect of the observed stratification on piping integrity is negligible. Based on this, the alternate charging line is acceptable with the lift check valve installed in place of the spring loaded check valve on the bypass line.
- The auxiliary spray line monitoring data shows a low level of stratification temperature difference throughout the monitoring period, and a few transients which are attributed to tests. Since the number of these tests is limited and the temperature difference is-less than that evaluated in Section 4.0, the effect on piping integrity is negligible, m e. w m to 73
. o FABLE 7-8 COlmENTS ON IBONITORIIeG DATA PLOTS Appendix Approx. RCS Temp. (*F)
Page Seg. of Plot End of Plot Normal Charging Alternate Charging Aumillary Spray A2 93 175 Charging flow temperature Closely foll WS RCS Cold leg 420*F to IOO*F was 75*F at 19:36. temperature (start of spray flow assumed) 248 345 Charging flow reduced at Stratification appron. IOO*F Closely follows RCS cold leg A3 17:46. Charging flow after 20:46. Noneyclic temperature temperature was 269*F at 17:58. A4 348 341 Charging flow reduced at Strattftcation approx. 50*F Closely follows RCS ccio leg . 19:20. Charging flow temperature. temperature was 345*F .4 at 19:33. E AS 345 447 235*F temperature increase Stratification approx. 50*F Closely follows RCS cold leg assumed to be a design temperature. transient. . (No Regenerat tve Heat enchanger outlet temperature available.) A6 447 566 Charging flow temperature Changes in charging flow Closely follows RCS cold leg was 376*F at 7:12 and around 7:00 temperature. 562*F at 7:22. A7 565 566 Charging flow temperature Strattftcatson of about 26*F Constant stratifIcatton of approx. 550*F throughout about 40*F plot. A8 566 564 Charging flow temperature 5t rat if Icat 1on of atWAt 26*F Constant stratification of approx. 550*F throughout about 40*F plot. t:matm12
.-m .-o -- .m__. -m.. ..mu
TABLE 7-1 COISIENTS ON IBONITORING DATA PLOTS Appendia Approx. RCS feno. (*FI Page Beg, of Plot End of PIot NormaI Charging AIternate Charg1ng Aum83%acy Spray A9 564 566 Charging flow temperature StratIftcatton of about 26*F Constant stratIfscatson of 428*F at 13:54 and 561*F about 40*F at 14:35. A10 566 566 Changes in chargtrig flow Strattftcation of about 26*F Constant stratification of temperature. about 40*F All 565 565 Charging and letdown flow Charging and letdown secured Strattrication of about 28*F. - secured at 18:24 for valve at 18:24. Stratification of leak repair about 140*F 567 568 Charging flow commences Chargtng flow commences RCP t*1p test at 7:26. y A12 m at 1:25. at 1:25. A13 566 566 Charging flow temperature Constant strattftcation of Constant strattftcation of 462*F at 5:57 about 30*F about 30*F A14 566 566 Charging flow temperature Constant stratifIcatton of Constant strat1fIcatton of 381*F at 4:46. about 30*F at,out 30*F A15 565 565 Normal charging flow Alternate charging flow Constant stratificatton of secured at 18:50 commences at 18:50. Charging atost 30*F flow tesp. appron. 550*F A16 566 563 RCP trto test and alternate RCP trlp tes.t and atternate RCP trlp test at 22:00. charging secured at 22:00 charging secured at 22:00 A17 563 566 Approx. at RCS cold leg Alternate charging secured at RCP trip tests around 23:30 temocrature after test- at 2:27. Stratification about completed- SO*F A18 566 568 Approx. at RCS cold leg Alternate charging f!ow Constant stratifIcatton of c =uesz po n tmat UM w r+ .es at 3:30 E*T7M ?O**
1 SECTION 8.0
- 1. United States NRC Bulletin 88-08, " Thermal Stresses in Piping Connected to Reactor Coolant Systems," 6/22/88; Supplement 1, 6/24/89; Supplement 2 8/4/88; and Supplement 3, 4/11/89.
- 2. Festinghouse Report MT-SME-552(88), Rev. O, " South Texas Units 1 and 2, Identification of Unisolable Piping and Determination of Inspection and Monitoring Locations," W. H. Bamford, October 1988.
- 3. Program WECAN, Version Date 9-07-300, Westinghouse Proprietary.
- 4. 1986 ASME Boiler and Pressure Vessel Code, Nuclear Power Plant Components, Section !!!, Division 1 and Appendices, and Section XI, Division 1.
- 5. " South Texas Units 1 and 2 Pressurizer Surge Line and Residual Heat Removal Line Stratification," WCAP-12067. December 1988; Rev. 1. January !
1989; Supplement 1. January 1989, and " Evaluation of Thermal ! Stratification for the South Texas Units 1 and 2 Residual Heat Removal Lines," WCAP-12108, January 1989, Westinghouse Proprietary, i
- 6. United States NRC Bulletin 88-11. " Pressurizer Surge Line Thermal !
Stratification," December 1988, i i I o n .m.n w io 8-1
Appendix Unit 2 Monitoring Data e an an o io A-1
e o c. DtM M , :::C ei - l m-80 - a0 - n- , normal ci,dging- ,
, m. .J
- u. !
u. M= -
- Og .
0,.. -n
.sya N(
a0 - ll: Vi" n-M- 70 - , 74 - . ' i,0
' " - , j
.0 i t
140 - si 130 = 130 - i
,,0 c.1 ternate charging
.i 100
- i h.
90 - 480 " , 400
- 3W - t 300 auxiliary spray 1
l 380 - i 30-l __ 100 - 100 - SO
'19 44:41 4 g347 3g lt 4320e/0$l50010
-A-2
1
>1 1
- 1
'F a
- , pub te as ;
am . l aan - :1 340
- l 320 -
am - 1 210
- ano -
- 19. - .( '
in - tw normal charging m. i .e - t , , , . 3. 130 * , t iso - , 110 - ion - .i
- --e # ,% v - m__ -
- as -
280 - l:::M am -
#10 -
, m- [ alternate charging 110 - l
,eo - n iso -
140 *
,3, . = t^md
-i- I -i 110 -
im - p , ua- , m- _ __ 330 - 310 * .i 300 - 290 - ,f
. ano -
- m. auxiliary spray .
. meo -
280 - 240
- zao 1016 co - an.48-00 tese (ws) q i
n 4u mimio A-3 a I _w_., . , ,.
. . ~ . - . ~ - - . - _ . _ _ _ - . _ _ _D
I' l ,
'F
- l aos s me-l sao -
ano - ne. - n2 normal-charging an - , 100 - 100
- iso -
130
- 100 a 100 -
J
,. , [ alternate charging.
IM - , l. I j' iso - 110 - 100 - , 340 - 336 - 334 - 3as - I
.- auxiliary spray 330 -
.- I ans . .
- m-m-
330 - 318 14:2416 - It ?4116
. fast (>GW) .
.4us<aseo no .g.4 . ,
1. l 1
^l 1
'F l
- l see -1
<00 - -
I 300 - 1 L I
"~ '
normal charging 380 - 2 5$' 200 - 1:0 - in - _ ! so i 400 - i. 3M *
.}
30-340 - m- alternate charging 200 - .
. 300 =
200 - 7 340 - ' 4 aD-a00 - 100 - ie0 - l_ t
.30 -
.ac -
i auxiliary spray 300 - 3** *
.)
. L 31PO - -'
340 - 300 - 340 -
#~ ^ -
30 13-061g i1'41:19 Tibet M l .. 4n.uosism to A-5 i i
- . - , .. s . , . , - . _ - _ - .-._.,2
\
l u
'F ;
r .. . see 0,
.=-
S30 -
# )
normal charging , an0 - siO - ) ; s00 - .T 7 400 - 40- 1 F%At 4.
. 40- g og 4se - '
m- - j.
.=- ,
430 -
- o 4l0 -
400 - 300 - , 300 - J- , 630 - 810 - 300 - altornate charging J 40-470 - - I 440 -
- ese -
440 - a en - 430 - 410 - 400 - , m- i-Je0 - 370 - m-See - see - sm . auxiliary spray
*=-
sie - SCO - QQ 4e0 - 4
. 0 470 -
440 - 430 - - 440 - 430 - :f l- 4an - , 410 12 29 S1 10 09 St ; That Osts) 4 43261/061590 10 A-6 -
t
..y **
me us- l
}.
us-
"** \ ,
! 44 - us- ( l', us-
~;: K Y l
=- ,
&37
- l u.- normal charging ;
au - ., i Sie *
- si - [.
m-m-
- altornate charging 4M
- j du -
g en - 4ea - ku% so - y 1 ! N
- sao -
saa -
\
eio -h . -. M
- m. s
. auxiliary spray (
' 480 14 M S1 12 43 12
*t M j h..
4u..mino io A-7
- I L .1 1
L ep sum as.-as nas , i ses - l o - m- 1 Y I no- , m- , normal charging
..- 3 I
i 800 = 498 = ( l 4.o - ge_ __ - m-t m-l m. alternate charging
/k
=
m-
**** u
-e _ __ - _
I -- - -: G 7z _z--
-9 .
See - 336 - MO-
- auxiliary spray sas -
. $30 *
'StS -
... 'g u -
u M
'i3 32 F1 - 1244 57 -
NM 1
.u mis o io A-8 J- - -. - - _ _ _ _ _ . _ _ _ _ _ , . ,_ _. _ _ . . ,
'F ma e r seu see - !
so. :; s ( S20 - Sag - sie - 4
.. . p 4e0 - 9 m- normal charging ,
470 -
- 4eo - ;
l sao - ; soo - y v~ : Y i 470 - 4eo - l see - I 440
- f altornate-charging l
+20 -
l
- m. 4
_r 540 - sas - l auxiliary spray S28 - 1
. S20 -
-_x -n
_,f_--^_^^- S10 -4 1-
-} v 7, uo- P 'l i
l am - j , sie -
- 400 =
, normal charging 400 - ' I ' , sea . sa. - . ' n= - ; I sie -
~
~
~%- f i
-- \ ,
4,. . ---:- _ y_ ._ . } U ' I m-
.. alternate charging V .
see - 40 - nae - nas = sto - O ' l soo - 400 - l M= 470 - 440 * [ . W-l~ sao -
== auxiliary spray !
430 -
-i eiO =
W f asem ., is sa .l
. t.
tasc oew) I 4 u eos w o A-10 .
*F l m -
SO - t-See -
- u. .
, ^-r :" x ryw - n u ,. . . 7 ,.
See - .nx ..u.
, , , , - I r r p .- , - . .
me-no-Q ,.
. u-u-
V ., Su - 430 - uc, - normal charging us- , ud-
.ua -
830 '- 810 =
.00 -
, 400 400 - 470 - 400 - i 40- .l 440 - 430 - 430 - 440 - 400 300 - 30-sw a alternate charging 300 - 380 - l 880 - S48 = ' - - -A
~-__.
us- = See - S48 - l See - S38 -
- 43. - -
- l. 534 -
s 332 - - 530 -
=- auxiliary spray
- See -
524 - 333 -
=0 .t_.n_a_ A..- _,__
stb - Sie , 14 S331 - 12 90 31-
-i -
1988 (>EW) . l l 4nwosino io f.11 i-l
. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _. ~ _~ _. . _ . _ _ _ . . . _ _ . _ . . _ _ . ._ _ _. . . _ _ _ _ . _ _ . . _ . .
1
'F non - _
m- -
- i dog -
see - l s Joe - ano - normal charging m- r-4ao - 4 anc - l ; alternate charging ano - t i iso - 0= l .4o - . I. - l m-auxiliary spray toO - 390 - , Soo - SM -
- Sea -
ChN [ oPas 2 ' ft8C (>WW) . 1
;k
~
an mmo io A-12 t
, _ --- .,. . _ _ . . . . . . _ . ._ _~ ___ . .. _ . _ _
. p.
um io as -
~k __
~-- _- ~ _ __ L_ ..:_ ;_ <
t
- m. <
. l-
- m. . t.
t 11
. sto - .1
'l Soo
- t J '
490 - normal charging eso - 1 o- M j SO4 - So. - SO4 - 302 - , Sao - 4= - alternate charging . ; 4ts - 494 - t 492 - 4to - *
'?
'i S6S -
- y, -
- . : - - ~
y,_ .; L . t
%e '
.- auxiliary spray Sao -
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