Text

Vol 1 of SOER 86-3, Check Valve Application Review.
	ML19354D647
Person / Time
Site:	Comanche Peak
Issue date:	11/30/1989
From:	Horst T, Kalsi M; KALSI ENGINEERING, INC.
To:	;
Shared Package
ML19354D646	List: ML19354D645; ML19354D647;
References
	SOER-86-3, NUDOCS 8912290003
	Download: ML19354D647 (61)
	v • d • e

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A Enclosure to 1XX 89849 dP4 .,

Page 1 of 61 Puge t

. SOER 88 8 CHECK VALVE APPLICATION REVIEW r

hamarmre h MB8 Noveenber30,199 I

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. rrepared y TaasUtstiesElectric Cosapsey Comanche Peak Steam Electri: Station, Unit 1 Glen Rees, Texas O

VOLUME 1 of 3 l . Prepared by Reviewed and approved by 1 1

} T-A-1 M n/3o/e '

ti tom Horst M. SIKalai, PhD, 'P.E.

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. Ceauen W.ess.:.cos?

EE! PGs k. 98.3 MALSI RNSINERRINS, INC. '

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. Desumem430s. lS6 Enclosure to TXX 89849 31ssamher30,2000 Page 2 of 61 pegs s TABLE OF CONTENTS Page l

1. Enesutin Summary 3 1

2. Introduction 6

3. Cenelusions 8

4. Reeemmendations 4

6. Analysis Results: i 6.1. Summary of Component Cooling Water System T. .

6.2. Summary of Condensate 21 l

l 6.3. Summary of Diesel Generator Air Start System B 6.4. Summary of Service Water System W 6.5 Summary of Extraction Staam System 27 6.6. Summary of Chemical and Volume Control System 30 l 6.7. Summary of Auxiliary Feedwater System 40 I

6.8. Summary of Main Steam System 80 l 6.9. Summary of Feedwater System 52 '

6.10. Summary of Residual Heat Removal System 5 6.11. Summary of Safety tryection System 57 l

i Appendix A: Valve Inspection Procedures Appendix B: Description of CVAP Program (Check Valve Analysis and Prioritization) r Volume 1 Report and Appendiese i Ph8**

Report 61 Appendis A SS Appendia B 8 Volume 2 Analyses and Data Shoote KALSI ENGINEERING, INC.

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30 3 884 CEBCE VALVE APPLICATIONREVIEW

1. EEBCUITYESUROSARY I

his report presents the resulta of application reviews performed on selected check valves installed Temas Utilities Electric Company Comanche Peak, Unit 1. De review is being eenducted in response to TU Electrie Contract No. 66810067. N application review is !

eenducted according to the suggestions contained in INPO SOER 86 3 which directs utilities to perform application reviews of check valves installed in the following systems:

1

Mann Steam Feedwater (including Auxiliary Feedwater)

Chemical and Volume Control

Safety In}ection

Residual Heat Removal ,

Nuclear Service Water

Diesel Air Start i

The following systems were also reviewed:

Component Cooling Water

Condensate

Estraction Steam The ohjectives of the review are as follows:

Identify potential check valve misapplications;

Develop a preventive maintenance program to monitor check valve degradation and ensure check valve operability; .

Develop inspection procedure (s) to facilitate the collection of both the qualitative and quantitative data necessary to assess check valve degradation;

Recommend design improvements, modifications, and surveillance program -

enhancements where necessary to help ensure reliable check valve operation.

A total of 274 valves are included in the reviewed systems. Valves less than two inches in sine and valves that are used infrequently Geas than 5 percent of the plant operating eyele) were not included in the complete analysis and review process. The remaining population of 145 valves have been subjected to the complete application review.

KALSI ENGINEERING, INC.

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he m#erity of obeek valve installations nyiewed in this report an suitable for reliable :

long term plant operation. Of 145 valves reviewed,15 an enndidates for aseelerated hinge l

pin wear and/or dine stud fatigue. An additional 10 valves should be checked to ensun i

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l proper dise seating. In this group of15 valves,19 (66 percent) an swing check valvn manufactured by Berg Warner.

t In addition,5 of la feedwater system check valves should be ebuked during the first i refueling outage for materialloss due to erosion %rrosion, hoe have been listed in the i high priority inspection group. .

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In our opinion, the frequency and wide ranging natum of the problems encountered with Borg Warner check valves, and the fact that problems continue to surface, represents s l

situation which may continue to compromise maintainability of these valves and the j systems in which they an used. Even though TU Electric has taken prompt action to I addrus each problem as it occurred, we recommend a thorough, systematic design review ,

be conducted to address the following items:

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Redesign of disc stud to eliminate fatiguh concerns

Undentand all dimensional and tolerance aspects of the bonnet /dise/ hinge arm assembly as they affect valve closure.

Review any and all design changes from a global or systems standpoint to l ensun compat.ibility with each other and to the valve as a whole.

i Based on the analysis and review of all the check valves, specific recommendatier.s for the inspection / maintenance intervals for each valve have been developed. These recommendations should be integrated into the overall preventive maintenance program inclnding the in service testing requirements for check valves to satisfy ASME Section XI IWV.

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! The results of the review for each check valve are properly doewunented in the nport with specific recommendations. Actual inspection results and more specific weight and dimensional data can be used in the future to form a sound basis for afining these recommended inspection intervals.

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KALSI ENGINEEftlNG. INC.

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DesumentNo m Enclosure to TXX 89849 !

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S. Df!BODUCITON ;

SOER 864 identined the mWer eeuws of chuk valve failun as misapplication and I M'& preventauve maintenanee. As a resuk of the Andings reported in 80ER 864, ,

{ INPO suspeted Utilities follow a couru of action including the following steps: '

1. Establish preventative maintenance precedures which will help identify incipient ehmk valve failuru. >

2. Perform a design nyiew of the ehnk valve installations in the identined systems to l j determine the suitability of each valve application.

l Subsequent to the issuanee of SOER 864, the Appliestion Guidelines for Chec4 Voices in .

Neeleer ENeer ElSats, EPRI NP 6479, was published to help utility engineers perform the applicabn review and implement the INPO recommendations. Erperience has shown

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that appliestion of the EPRI guidelines often results in the determination that a check valve is misapplied, usually because the minimum velocity requirement has not been satisfied.

If all such misapplied valves were added to routine (refueling outage based) maintenance operations, a significant and unnecessary increase in maintenance workload would result. Kalsi Engineering has developed a systematic review methodology which by quantifying wear and fatigue damage for each valve, yields a more nasonable yet still conurvative set of recommendations for the valve.

The review process is based on the guidelines presented in EPRI Report NP 5479. All important performance, design, and installttion variables e.g., the type of check valve, its minimum flow velocity requirements to fully open the disc, the effect of upstream disturbances, the orientation of the valve, and the flow conditions and their duration an taken inte account during this review. In order to facilitate a thorough, consistent, and quantitative review, the Check Valve Application and Prioritisation program (CVAP')

developed by Kalsi Engineering is uud. This program incorporates the technical guidelinn provided in EPRI NP 5479 as well as the mon recently developed information eentained in NRC NUREGCR 5159, Prediction of Check Valve Performance and Degradation la Nuclear Power Plant Systems, and Rockwell Internationars Check Valve Applicatloa Manual and Uses's Guide, V 308. (See Appendix B for a description of CVAP.)

CVAP is a proprietary program developed by Kalsi Enginwring, Inc. It is fully docu.

mented and has been verified according to Kalsi Engineering Quality Assurance

Manual, Document No.15000, Rev. 2.

KALSI ENGINEERING, INC.

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DesumsatMa les Enclesure to TXX 89849 Novem6erM 333 Page 6 of 61 Pageo

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CVAP utilians information about the important phyeleal variab%s of the cheek valve and upstream piping esangurations to compute h minimum pleesty required to fully open the vain. In additisa,inf6rasation about h actual operational flow rates are used to estimate whether the vain is fully open and stable or if dise impact and eseillation are causing antigue and wear degradation of vain internals. Neo enleulations an used along with l the review data to denlop opecine recommendations for each valw.

Wear and fatigue calculations performed by CVAP an summarised in the form of an 1

indes for each estagery, h wear indes is band upon wear of the hinge pin of a swing or l

tilt dise vain. Hinge pin life is considered completely used when half et the pin diameter has been worn away. This is a conurvatin limit providing for enough remaining .

I matedal to still allow h valw to perform its intended function. Fatigue of the disc stud is often an area of concern in swing check valves. When dine tapping securs, the stud can be suhjected to bending strus, ultimately resulting in fatigue failum of the disc stud when stresses an high enough. An estimate of the stress developed in the disc stud is made by CVAP, and this is used to calculate the fatigue life'of the dise stud. N degree to which the wear or fatigue life is consumed is categorized by assigning an index to both calculations according to Table 1:

HINGE PIN WEAR / DISC PIN FATIGUE INDEX KEY Wear / Fatigue Wear / Fatigue No. of Plant Usage Index Cycles to Limit 0% to 7% 1 = Very low 14.0 7% to 14 % 2 = I4w 7.0 14 % to 20% 3 = Moderate 3.5 20% to 50% 4= High 2.0

>56% 5 = Very high < 2.0 Note: loot hinge pin wear corresponds to 50% of pin diameter.

Plant cycle defined as 16 months of plant operation including normal and refueling operations. l TABLE 1 BCALSI E NGINEEftt NG, INC.

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DesumsetNo. 3m Enclosure to TXX 89849 Musember 80,3SN Page 7 of 61 Page ?

By combining the output fmm CVAP with esioeng maintenanos data, a prierstised list of !

vain inspection resemmendations is developed. Depending upon the nature of the I degradation presses, type of vain and material et construe 6en, vain loesuon, and ALARA seneerns, any number of inspection options aan be utilised. For example, wear and fatigue calculations can be quantified in some cases by using an ultrasonic disc.

neuen measurement technique such as the MOVAT8 Ch=hMate* system or by using radiographic inspostion of the operaung valn. Quantitatin measurements of disc motion can be compared with the CVAP predictions and a4ustments made secordingly. Verifi-cation of disc tapping een be detected in some casu with eeoustic emission technology.

Material loss due to erosion / corrosion effects can be monitored with ultrasonic wall-thickness measurement equipment. Finally, physically opening and inspecting valve internals may be necessary.

These inspection recommendations should be integrated into the existing preventive maintenance program and, as results are gathered, inspection intervals can be fine.

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Desument No.14N Enclosure to TXX 89849 November 30, Ass Page 8 of 61 pegs e i S. CONGLEl0l@

1. De majority of obeek valve installations twiewed in this report are suitable for i reliable long-terus plant operation. Of 145 valves reviewed in this report,15 valves :

are eendidates for aeselerated hinge pin wear er dise stud fatigue.

2. Eighteen valves in the feedwater system have been identined as pmaible candidates !

for erosion /eorrosion damage. Initially them valns should be monitored on an l annual basis to check for material loss. Subuquent inspection intervals can be ,

determined based on the results of prwlous maintenance inspections. *'

3. In reviewing maintenance histories, operations data, and results of the individual j valve analyses, it is apparent that check valns manufactured by Borg Warner i j - han been involved in a disparately high proportion of plant problems. Some of the l specine problems encountered include:

Inadequate tack welds betwun dise and stud on certain valves. Rework instituted based on Borg Wamer recommendations.

Inadequate or nonexistent pickling and passivation of valve internals on certain valves. Rework instituted based on Borg. Warner recommendations.

Iriadequate vendor maintenance instructions result in improper vtive reassembly, causing incomplete valve closure and reverse flow in auxiliary feedwater system. NRC IN 89 62 issued. Valve rework instituted based on Borg-Warner recommendations.

Estremely critical nature of bonnet installation to ensure proper valve function and closure identi6ed in Kalsi Enginwring Report 1592.

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Futures designed and maintenance procedures updated aner inadvertent bonnet misalignment results in valves that do not elow.

Previously completed tack weld rework found to affect vain closure in some cases. Further tack weld rework initiated based on Borg Warner recommenda-tions.

KALSI ENGINEERING. INC.

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Desumsath ans Enclosure to TXX 89849 !

NessenberM age Page 9 of 61

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Hiny are freeture failure in servies water valve resulte in larp scale !

n;E- - t program. New parts applied by Berg Warner.

Aasi;iary feedwater pump miniflew valve disc stad found to be severely boot from impact with bonnet. Design modi 6 cation based on recommendations in this Cheek Valve Appliention Review implemented by TU Electric personnel in l esseurrenes with Borg Warner. '

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In addition to these problems, the Application Review has helped identify design ,'

features of the Borg Warner valns which, in our opinion, are not consistent with prudent and conservatin design practice and which, under certain conditions, will result in drastically reduced valve life. hose features are:

Small diameter, threaded disc stud design !

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Unusual internal pometry which, in certain valve models, allows for oblique contact of the disc stud and bonnet at the full open position.

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l. Flow conditions which result in the dig tapping against the bonnet, i.e., flow velocity not quite sufficient to fully open the valve, will subject the disc stud in these valns to high bending stresses which will accelerate the fatigue process, reducing valve life to unacceptable levels. ~

While these problems have each been dealt with by plant personnel as they have arisen,it is our opinion that, taken as a whole, these incidents represent a more serious situation than would be indicated by any single problem. Although the action taken to date has thoroughly addressed the individual problems with these valves,it is our concern that, given the broad nature and frequency of occurrence of problems, a careful review of Borg Warner check valves should be performed by TU Electric. De goal of this review should be to ensure design adequacy by addrusing the following issues:

Redesign of disc stud to eliminate fatigue concerns i

Understand all dimensional and tolerance aspects of the bonnet /dise/ hinge arm assembly as they afect valn closure.

Review any and all design chanps from a global or systems standpoint to ensure compatibility with each other and to the valve as a whole.

KALSI ENGINEERING, INC.

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i Desunseth am8 Enclosure to TXX 89849 lissember30,193 Page 10 of 61

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4. marmasegIhATIONS PetarttimedIJetafVahes Using the venants of analyses performed with the CVAP program, the ebeek valves included in this application review have been prioritised according to when inspection operations should be scheduled. '!he inspection needs are grouped as follows:

1. Valves that should be inspected prior to plant start up; 1

2. Yalves that should be inspected at the Bret refueling outage;

3. Valves that should be inspected aAer three years of operation;

4. Valves that should be inspected aher Sve yeare of operation; and l i

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6. Valves that should be inspected aner ten years of operation. i l

Note: Wherever two er more valves comprise a group (i.e. DO 0054,89,62,63), only one l valve in the group needs to be inspected initially. Should that valve show signs of internal degradation, then the others should be inspected also.

Table 1 Valves To Be Inspected Prior to Plant Start Up Subsequent Wearl System Tag No. Function inspection Fatigue l Interval Problem t Component CC 0317 CCW Return from Ventilation Chillers 10 years (l) Yes Cooling Water Diesel DO 0068 Air Dryer Package to Air Receivers 1 year 42) ye, Generater DO-0069 Air Start DO.0062 DO 0063 Service Water SW 0016 Service Water to Safety Related Trains to yeare(l) Yes SW 0017 1A &lB SW 0014 Screen Wash Pump Suetion 10 years (l) Yes SW-0048 (1) Assumes no evidence of damage due to repeated disc tapping against the stop.

. (2) Existing IST program adequately addresses inspection / test needs.

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w y.,ggg Enclosure to TXX 89849 Noseguber 30,19g Page la of 61 g gg l

l vah ToBeInspededPdortoMantSwUp i hble1(Comebased) l Bubengruent Weert System T4 No. Function inspection Fetique interval Problemet Auxiliary AF 0078 AFW Turbine Driven Pump Supply to 10 years (3) No Feedwater AF 0008 SG1thru 4 l AF 0008 l

AF 0106 AF 0076 AFW Motor Driven Pumps 1 and 2 10 years (3) No AF-0083 Supply to SC 1 thru 4

AF 00es AF-0101 AF 0061 APW Motor Driven Pumps 1 and 2 10 years (8) No AF 0066 Discharge AF 0046 AFW Pump Miniflow Lines 10 years (3X4) Yes AF 0067 AF 0069 AF 0038 AFW Turbine Driven Pump Discharge to y ,,,(4) Yes (3) Assumes disc seating problems have been rettified.

i (4) Assumes disc stud fatigue problem has been rectified. ,

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DesumentNo. 3ms Enclosure to TXX 89049 ;

November 4 333p Page 32 of 61 page 13

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l TadineS Valves To Be Inspeded at Mret Radmaltag Outage <

System Tag No.

8 % sent Wear / ;

Function inspection Fatigue '

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interval Problemt Main Steam MScass Steam Supply to Main Feed Pump 1 year Yes MB.0333 Turbines Feedwater FW 0006 Main Feedwater Pump Discharge 1 year No(s)

FW 0013 FW 0070 Main Feedwater Containment Isolation 1 year No(5) :

FW 0076 FW 0083 FW-3088

! FW 0191 Bypass Line Containment Isolation 1 year No(s) :

L FW 0192 FW 0193 FW 0194 FW 0195 Bypass Line Containment Isolation lyear Nots)

FW 0196 -

FW 0197 l FW 0198 FW 0199 Bypass Line Containment isolation 1 year

l. No(5)

FW 0200 l FW 0201 FW 0202 (5) Check for erosion / corrosion damage.

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Tables Valves To Be Inspected Every %:se Years I

System Tag No, Function Condensate Condensate Pump Discharge Service Water " Service Water Pump Discharge l

Extraction Steam Io t From Turbine to Feedwater Heaters 3A & 3B i

KALSI ENGINEERING. INC.

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I L Desumsm6No. 3me Enclosure to TXX-89849 l-NwasuberM 333 Page 13 of 61 Puge 18 Tabled Vahes To Be Inspected Evesy Five Years

System 1\ug No. Function g ",, CC4713 CCW Supply to Ramster Coolant Pumps 1

Extraction Steam hq"$ bm Turbine to Peedwater Heaters 4A & 48 i

Chemical & 1437&A .

I Volume Centrol RCS Normal Chargm.g 143788 14381 Containment !aolation at Penetration M II!4 ,

14496 14tdown HI to Letdown PGter 14454 Cation Bed Domineraliser to VCT l Residual Heat 14730A '

Removal 147308 RHR Pump Discharge

Prom RWST to RHR Pump No. 2 Suetion >

Safety injection 14M9A Prom Safety injection Pumps to RCS Hot legs I I

14M9B 14M9C 14M9D l t

KALSI ENGINEERING, INC.

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i Tame 5 vehen To seInspeceedeveryTen Years System Thg No. Function l Component CC4081 Component Cooling Water Pump Discharge Coollag Water !

CC4081 '

004061 CCW Return hem Reactor Coolant Pumps 0C4000 !

CC4003 C04097 0C4646 Reactor Coolant Pump Thermal Barrier Inlet 004067 004007 OC40N l CC 1076

CC 1076 ;

C0 1077 8

Thermal Relief on CCW Return Lines from CC 0629 RCF's

1 CCW Supply to Excess Intdown Heat CC 0002 Exchanger Extraction Steam EX-0308 From Turbine to Feedwater Heaters 2A & 2B

' EX-0309 '

gg From Turbine to Feedwater Heaters 1A & IB i EX 0307 Auxiliary AF 0032 AFW Turbine Driven Pump Suetion from CST I Feedwater AF0167 AFW Pump Test IJne Return to CST AF 0114 Condensate Transfer Pump Discharge AF 0009 Non Return from Demin. Water Makeup AF 0014 System AF 0024 Main Steam MS 0142 Steam Supply to Aus Feed Pump Tusine MS 0143 KALSI E NGIN EERING. INC.

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hM Enclosure to TXX 89849 HEE Page 15 of 61 Pepe M l VahesTo BeInspectedEveryTanYears Table 5 F'dM ;

pedem The No. Function L

Chemical & 1 4379A RCS Alternate Charging Volume Centrol !

18379B i 1C54:77 RCs Auxiliary spray 17039 14tdown Rehest NK Outlet I 17068 Moderating HK Outlet to Letdown Chiller HX l 14417 14tdown to VCT and BR8 Recycle Hold up ;

18430 Tank i 14440 Volume Centrol Tank Outlet 14546 RWST to Charging Pump Suetion i 14497 PD Charging Pump Discharge !

l CS4487 Borie Acid Transfer Pump Discharge ;

CS4473 l 17050A Chiller Pump Discharge t !

1 70608 1 i

1 1 CS4480A Centrifugal Charging Pump Discharge l CS4480B l 14481A l 14481B i

)

CS4350A RCP Seal Injection CS43508 CS4350C CS4350D CS4367A CS4367B CS4367C CS4367D CS4368A

, CS4368B C545600 CS4368D CS4443 Boric Acid Filter to Centrifugal Chstging Pumps CS4429 Domin. Water Makeup to Boric Acid Blender i

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KALSI ENGINEERING. INC. I Mec r h Otters & m vee I

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Desumsm6No. 3Se Enclosure to TXX-89849 Novem6er886 803 Page 16 of 61 Page 14 VahesTo BeInspectedEveryTen Years Table 8 'thd===nh system Tag No. Function safety injection 14 essa safety injection Pump Discharge 14003B 14818A Cold Ig injection leelation ;

148188 148180 14818D 14841A RHR Heat Eschanger to RCS Hot ! ass 2 and 3 188418 1

18000A hm RNR Heat Ezehanger to Charging Pump Section 140008 Nm RMR Heat Enchanger to Safety :

Injection Pump 18948A RCS Cold 14g injection 189488 18948C '

1-8948D -

18966A Accumulator Tank Discharge 149668 14966C 14956D 18926 From SIS RWST ta Safety injection Pump Suetion

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'IUEllesed> Commanebe PeakEUnh1 l Summary of Component Cooling Water System Novunbar 4,1980 i Revision 1 I GeneralDiscussion I

There are a total of 19 cheek valves in this system. Ny have been grouped inte the !

following 7 estegories: l t

Desmipelas Nunnbar

1. Component Cooling Water Pump Discharge Tag Nos. CC 0081, CC-0061 24"s 30"a 24" Rockwell tilt disc 2

2. CCW Retum from Roseter Coolant Pumps .

Tag Nos. CC 0651,0C 0690, CC 0693, C0 0697 4" Borg Warner swing check 4

3. Reacter Coolant Pump Thermal Barrier ihlet Tag Nos. CC-0646, CC 0657, CC-0687, CC 0694 001075,CC 1076, CC.1077,001078 2" Rockwell lift check 8 i

4. CCW Supply to Reacter Coolant Pumps Tag No. CC 0713 8* Borg Warner swing check 1

5. CCW Return from Ventilation Chillers Tag No. CC 0317 10" Borg Warner swing check 1

6. Thermal Relief on CCW Return Lines from RCP's Tag Nos. CC 629, CC4831 2" Rockwell lift check 2

7. CCW Supply to Escens Letdown Heat Enchanger Tag No. CC 0608 4" Berg Warner swing check 1 Recommendations for each category are:

KALSI ENGINEEftlNS. INC. ...

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1. Osapename Caoung Weemr Pump Disshesp Tag Numbers. 00 0081,00 0061 Wear lades: 1 I

Fatigue Indss: 1 Comments: Plew velocity through these valves is 18 f>s. his provides a 46% 1 margin ever the calculated minimum velocity of 12.3 fps resulting I in a fulh open dise. i g ww.

One as a sample of the group every 10 years to check for wear and damage in the following areas:

A) Dise and seat i B) Hinge pins and bushings i

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2. OCW Baturn hemi Beacear Coolant Pamps Tag Numbers 00 0661,000690, CC 0693, CC-0897 Wear Inder: -1 Fatigue inder: 1 Comments: Flow velocity through these valves is 13 fps. This provides a 63%

margin over the calculated ininimum velocity of 8 fps resulting in a fully open disc.

f=W Wdation:

One as a sample of the group every 10 years to check for wear and damage in the following areas:

A) Dise and seat B) Dise stud and stud bushing C) - Hinge pin and bushings

8. Ramesar Coolant Pump Mermal Barrier talet Tag Nos. C0 0646, CC4657 CC 0667 CC 0694 0 0 1075, 0 0 1076,00 1077,0 0 1078 Wear Indam: N/A to lift checks Fatigue Inder: N/A to lift checks Comments: IJft type check valves can be suhieet to piston chatter when the flow velocity is less than appresimately 26% of Vain which may result in seat damage, galling of the pisten bore, and stuck pistons. Based on manufacturers recommended minimum velocity for this type of valve, the actual flow velocities of 3.8 to 4.3 fps are 38% to 42% of Vain requirements. Therefore, accelerated degradation is not espected.

KALSI ENGINEEIIING INC.

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Fellow norssal maintenanee and IST program requirements paying particular attention ter signs of beek lankage whleh may indiente a degraded anat er reduced flew in the menaal ereation whieh may indiente a stisking pisten, i

4. OCWSuggktoneneaarcaslamePungs 5 Tag Number 00 0713 l

Wear Indu: 1 Fatigm Indes: 1 Comments: his valve will be oscillating at new levels and tapping during all

eperating medes. Stresses developed in the disc stud fkm contact ,

are low enough to preclude fatigue problems.

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Ones every 6 years to check for wear and damage in the following areas: '

A) Diseandbeat i B) Dise stud and stud bushing C) Hinge pin and bushings '

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l 6. OCW Returm tross VentGation Chmers P

l Tag Number 00 0317

, Wear Index: 1 Fatigue Index: 1 Comments: This valve will be oscillating at low levels during all modes of operation and tapping whenever now rates are in the 2600 to 2900 rpm range his flow range is reached during many of the system i modes depending upon which pump is in operatiort Predicted disc 1-stud stresses caused b~ contact with the step are low and will not result in reduced fatigue life. Nevertheless, this valve design is particularly susceptible to disc stud fatigue failure should the '

magnitude of disc tapping be more severe than predicted.

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1his valve should be inspoeted at the earliest opportunity to cheek for wear and damage in the following areas: '

i A)

Dine and saat

3) Dine stud and stud bushin6; C) Hinge pin and bushings If evidence of repeated disc stud contact is observed, changes should be considered to eliminate the dise tapping. Potential options are:

1) Deeresse the valve full open angle to reduce the flow velocity required to fuDy open the disc.

l KALSI ENGINEERING. INC.

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' hk m Enclosure to TXX 89849 ;

mg gg Page 20 of 61 gg 11)

Use a dWorest valw with redueed Vai. . Orts. !

ill) Increams the new rate to appresimateh 3700 spa to meet the esisting Vagn requirement.

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8. hermal Roust om CCW Return IJaes 8 rom RCPs

' l Tag Numbere CC 083,000831 Wear Indes: N/A tola ebecks Fatigue Indes: N/A to la shocks '

Comments: IA type eheck valves can be e@ to pisten chatter when the flow velocity is less than appresimately 35% of Vain which may result in '

esat damage, galling of the pisten here, and stuck pistens. Based on

manufacturers reeemmended minimum veleelty for this type of valve, the actual flew velocities of 0.1 to 0J f>s are 1% to SS of Vain ,

requironwnts. Nee valves are normally elooed and would only be called upon to provide thermal relief under ertreme plant operating l' eenditions. This type of operation makes the valve subject to pisten sticking due to corrosion.

le Recomunandation:

Follow normal maintenance and IST program requirements paying particular attention for signs of back leakage which my indicate a degraded seat or sticking

piston. -

7. OCW Supph to Esames 1stdown Best *-A n Tag Number CC 0602 Wear Index: 1 Fatigue indas: 1 Comments: Flow velocity through this valve is 13.7 fps. This provides an 85%

margin over the calculated minimum velocity of 7.4 fps resulting in a fully open disc.

1-pr nann - m andagnse Onee every 10 years to check for wear and damage in the following areas:

A) Dine and seat B) Dioe stud and stud bushing C) Hinge pin and bushings KALSI ENGINEEStING. INC.

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. Desumet Na, les 9, ['f$1 ' !

o i November 88,les page31 ;

i TUBaserte he Peak BR,Uset I !

Summary of Condensate Systems :

i 4

A#10,1ses i' Reviales 0 GeneralDisenssime P

here are a total et 3 ebeek valves in this system. Ny have been grouped as follows:

Description Number

1. Condannate Pump Discharge Tag Nos 00 000s,C04060 18" Crane tilt dine 2 Recommendations for these valves are:

1. cheaPumpDischarge Tag Numbers. 00 0002, C0-0060 '

i Wear Indes: 3 l Fatigue Index: 1 Comments: hoe valves are located 6 inches from the pump discharge flange.

Flow velocity through these valves is 14 fps. Calculated minimum f velocity is 22 fps resulting in moderate to high levels of disc i oscillation, t..p.ng nn d.d .

One as a sample of the group every three years to check for wear and damage in the following areas:

A) Dise and seat B) Hinge pins and bushings C) Dise stop KALSI .NOINEERING, INC.

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hk 2 Enclosure to TXX 89849 mg g Page 22 of 61 4

1UBaserts Osmannse Peak MUnit1 Summary of Diesel Generater Air Start System

.h4 7,1000 Revision 1 1

GeneralN Rere an a total of 4 shoek valves in this system. hey have been grouped as follows:

i Desedption Number ,i

1. Air Diyer Package to Air Receivers i Tag Nea. DO 0068, DO 0069, DO-0062, DO 0063 11T Rockwell lift cheek 4 Summaary of Diesel Generator Air Start Systems Check Valves '

The nature of the service conditions for this system are very diNerent than the other systems analysed in this Application Review. Accordingly, the problems associated with check valves an also different. First, system use is limited almost exclusively to monthly surveillance testing, requiring short bursts of air delivered from the :

accumulators and compressors. his results in slamming or hammering of the check !

valve internals on the discharge side of the accumulators. The compressor discharge valves will also be subject to repetitive tapping or hammering due to the pulsating i natun of the compressor output. The compressor discharge valves are also und for

, longer periods because of the time needed te re charge the accumulators. Second, cornsion from condenud water vapor also enstes problems with seat leakage and l

further weakens the valve making it even less able to withstand the repetitive slamming use. Review of NPRDS data for these systems shows recurring valve maintenance has been needed for corrosion and mechanical damage of valve l internals.

Service conditions for check valves in the Dieul Generater Air Start system are !

dominated by slamming or hammering of the valve internals during comparatively short periods of operation. The analysis methods und for the other systems in this Application Review sta based on wear and fatigue calculations for nlatively long term usage resulting from continuous flow operation. Because of this basic difference in valve usage, this analysis method is not appropriate for the check valves in this '

system. No natisfactory analysis methods suitable for une as a predictive tool are available at this time.

Remmuneadations:

In addition to IST program requirements, it is recommend that one check valve be I selected for inspection during the next refueling outage as a sample of the group.

Particular attention should be paid to all valve internals for signs of wear, corrosion.

l and impact damage. Subsequent inspections should be scheduled annually until 1

l KALSI ENGINEERING, INC.

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Desumsut h 2 3 4 Enclosure to TXX 89849 I 30seemberg agg Page 23 of 61 g

sanaal test and maintenames data enn be need e establish appropriate maintenaan l intervals, j i

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KALSI ENGINEEftlNS. INC.

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_ _ . _ _ . _ . _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ . . - . _ _ . _ _ _ _ . . _ _ _ _ . . . . ~ . . . _ - . . _ . . . . . .

Desumen4 Ms. ams Enclosure to TXX 89849 Messm6er 88,les Page 24 of 61 y,,, gg i o

RJBaserb. h hak E Unh1 .

Summary of Servies Water System i July 13,let !

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GansualDiesession '

here are a total of 16 shock valves in this system. They have been grouped into the following 5 categories:

Desmipties Number '

1. Service Water Pump Discharge Tag Nos. ISW 0873,1SW 0374 24' Mission Duo Chek 2

2. Service Water to Safety Related Trains LA &lB Tag Nos. ISW 0016,1SW 0017 10' Borg Warner swing check 2

3. Seroen Wash Pump Suetion Tag Nos. ISW 0014,1SW 0048 '

4" Borg Warner swing check 2

4. Miscellaneous Law Usage ,

i Tag Nos. SW 0076, SW 0077, SW 0388, SW 0389, l XSW 0017,XSW 0018 6

5. Miscellaneous Oess than 2. inch) ,

l Tag Nos. SW 0059, SW 0062, SW 0084, SW 0085 4 The valves in Group 4 were not analysed because they are used infrequently Gess than 5 ;

percent of the plant operating cycle) or are used only during emergency plant operating conditions.

The analysis methods und in this application review are based on wear and fatigue calculations for relatively long term usage resulting from continuous flow operadon.

herefon, this analysis method is not appropriate for the low use check valves in this system. Existing maintenance and test procedures should be followed for these valves.

N valves in Group 5 were not analysed because they are less than two inches in size and are not nuclear safety related. Failure of these valves to perform their intended function will not jeopardise plant safe,ty or operability.

I Recommendations for each category are:

l KALSI ENelN EERING, INC.

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, Dessment No. las Enclosure to TXX-89849 Neves6er 35,las Page 25 of 61 gg j l

, 1. ServlasWeserPumpDiessage !

Tag Numbers 15W 0873,1SW 0874 !

War lades: 3 !

Fatigue Inder: 1 i Comments: Presimity of these valves to the pump discharge causes high lewis of dise encillation and tapping against the step red. Continuous !

usage results in moderate predicted levels of hinge pin, step red, and !

return opnnt wear. Testa performed by the manufsetorer han shown this type of valw is enseeptible to dine easiDation ever a wide ,

rany of flow velocities. Experienee at other utilities with this type {

of valve in service water systems has shown repeated problems related to wear and corrosion of hinge pins, step rods, and return springs.

,ji 1 map. set.m m m.m.mA.g.m. I One valve as a sample of the group every 3 years. Check for wear and dameo in thou areas:

l A) Hinge pin and plate bushings !

B) Plates and seats C)Stop red and plate contact area D) Return springs and washers

2. Service Water to Safety Related Trains 1A &lB Tag Nos. ISW 0016, ISW 0017 Wear Inder: 1 Fatigue Index: 1 Comments: Velocity is below Vmin requirements resulting in low levels of dise oscillation. Combined with 50% duty cycle, these valves have very low predicted levels of hinge pin wear. Although these valves are not in the tapping rany during normal operation, dise contact with the stop is likely to occur during switch over between trains A & B.

Beesuu of the design of valve internals, high bending struses will be developed in the disc stud when this contact occurs. Repeated contact could amuse severe stud damap and fatigue.

l 1 p g m m.mA.g .

l One valve as a sample of the group at the next opportunity to check for war and damage in these areas: {

A) Hing pin and bushings B) Dioe and out C) Dine stud and contact area i D) Dise stud bushing and hinp arm bore Subsequent inspections should be scheduled at 10 year intervals assuming no damage ;

to the stud area is found and at meh outage if damap is present.

MALSI ENGINEERING, INC.

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' IhsuenantNo nete Enclosure to TXX 89849 November 30, ggg Page 26 of 61 p,,,g

8. BereenWash Pemy h Tag Numbers 18W 0014,18W 0048 West lados: 1 Patigue Inden: 1 Comments: Velocity is below Vwin requirements resulting in low lents of dine l l ;

l eseillation. Combined with 60% duty eyele, these valves have wry i low predicted levels of hinge pin wear. Although these valns an i

not in the tapping range during norsaal operation, dise eentact with the step is likely to assur during switch ever between trains A & 3.

Because of the design of vain internals, high bending stresses will be developed in the disc stud when this contact securs. Repeated contact seuld eause eenre stud damage and fatigue. .

~

sp w.g .

One valw as a sample of the group at the next opportunity to check for wear and damage in these areas:

A) Hinge pin and bushings B) Dise and anat C) Dine stud and contact area D) Dise stud bushing and hinge arm bore Subsequent inspections should be scheduled at 10 year intervals assuming no damage to the stud area is found and at each outage if damage is present, l

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KALSI ENGINEERING. INC.

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Revision e GeneralM bre are a total of 8 cheek valves in this system. Ny have been grouped into the following 4 categories:

Desertpelen Number

1. From TurWas to Feedwater Heaters 4A & G Tag Nos.1EX 0312,1EX 0313 30' Atwood & Morrill swing check 2

2. From Turbine to Feedwater Heaters SA & 38 Tag Nos.1EX 0310, IEX 0311 24' Atwood & Morrill swing check 2

3. From Turbine to Feedwater Heaters 2A & 28 Tag Nos.1EX 0308,1EX 0309 14' Atwood & Morrill swing check 2

4. From Turbine to Feedwater Heaters 1A & IB Tag Nos.1EX 0306,1EX 0307 10' Atwood & Morrill swing check 2 Recommendations for each category are:

1. Fam hetdme to Feedwater Beatsas 4A & G Tag Numbers.1EX 0312, IEX 0313 #

Wear Index: 2 Fatigue Inder: 1 Comments: Low levels of disc oscillation and continuous usage result in low predicted levels of hinge pin wear. Velocity is below Vain requirements at all reseter power levels.

le Baconenendatlan:

One valve as a sample of the group every 5 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Dise and esat C) Dine step and contact area l

KALSI ENet NEERING. INC.

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_ . _ . _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ . _ _._ ._. _ _ _ .~ _ _ _ _ _

Enclosure to TXX 89849 h

%g h. g m,g, Page 28 of 61

a. 7mema 'hshine se puedweemr masters SA & a Tag Numbers.15410,in 0811 Wear Indes: 3 Fatigue Inder: 1 Comments: Ederste levels of dise easillation and sendnuou usage result in moderate predicted levels of hinge pin wear. Velocity is below Vain '

requirements at all remeter power levels. '

3.s, node, a.

One valve as a nample of the group every 3 years. Check for wear and damage in these .

areas: **

A) Hinge pin and bushings

5) Dise and esat C) Dine step and contact area i

8. Presa Tetrine to Feedwater Besters gA & IB '

Tag Numbers. In 0308, in 0309 ,

Wear Indu: 1 Fatigue Inder: 1 -

Comments: Low levels of disc oscillatiori at 100% remeter power and continuous usage result in low predicted levels of hingo pin wear. At reacter power levels of 50% to 65% the disc is predicted te be oscillating and tapping. Low usage at these lower power conditions results in low cumulative damage, o

Inspeedom W Andam.

One valve as a sample of the group every 10 years. Check for wear and damage in these areas:

A) Hinge pin and bushings

B) Dise and seat C) Dine etap and contact area

4. FWuse Turune to Feedweser Besters 1A & IB Tag Numbers 1R 0306,15 0307 Wear Indes: 1 Fatigue Indes: 1 Comments: 14w levels of diu oscillation at 100% reactor power and continuous usage result in low predicted levels of hinge pin wear. At reactor power levels of 50% to 66% the disc is predicted to be oscillating and tapping. Low usage at these lower power conditions results in low cumulative damage.

KALSI ENGIN EERING. INC.

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h h 194 Enclosure to TXX.89849 Nequenber M U S Page 29 of 61 g WW One valve as a sample of the group every 10 years. Cbeek fbr wear and damage in these areas:

A) Hinge pin and bushings B) Dise and seat C) Dise step and contact area 1

KALSI ENGINEERING. INC.

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Desuenan6No.1884 Enclosure to TXX-89849 Nevesnbar30,1800 Page 30 of 61 ,

% 30

'IUEBneerio.Commenske Peak M Unit 1 Summary of Chemical and Volumm Control System >

November 4,1989 Revision 1 GemeenlDiscussion Nro are a total of 94 check valves in this system. by have been grouped into the foDowing 18 eategories:

Deseription Number

1. RCS Normal Charging Tag Nos.18378A,183788 3" Westinghouse swing check 2

2. RCS Alternate Charging Tag Nos.14379A,14379B 3" Westinghouse swing check 2

3. RCS Auxiliary Spray Tag No.1CS 8377.

2" Rockwell piston check , 1

4. Containment Isolation 9 Penetration M IkI4 Tag No.18381 3" Westinghouse swing check 1 j .- 5. Heat Exchanger Outlets 5a.14tdown HX to IAldown Filter Tag No.14496

'3" Westinghouse swing check 1 5b. Intdown Reheat HX Outlet Tag No.17039 3" Westinghouse swing check 1 Sc. Moderating HX Outlet to Letdown Chiller HX Tag No.17058 3" Westinghouse swing check 1

6. 14tdown to VCT and BRS Recycle Hold up Tank Tag Nos.14417,18420 3" Westinghouse 2

7. Volume Control Tank Outlet Tag No.18440 3" Westinghouse 1 KALSI ENGINEERING. INC.

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Enclosure to TXX 89849 DesensatNo.1834 Page 31 of 61 M848'bar 80,1988 p ,,31

8. NWST to Charging Pump Suetion Tag No.18648 8" WM'Trr: swing check 1

9. Cation Bed Domineraliser to VCT Tag No.18464 3" Westinghouse swing check 1

10. P.D. Charging Pump Discharge Tag No.18497 3" Westinghouse swing check 1

11. Borie Acid Transfer Pump Discharge ,

Tag Nos.108 8487,1CS4473 2" Rockwell pisten check 2

12. Chiller Pump Discharge Tag Nos.17060A,170508 6" Velan swing check 2

13. Centrifugal Charging Pump Discharge Tag Nos.1CS-8480A, ICS-8480B 2" Rockwell piston check 2 Tag Nos.14481A,18481B '

4" Westinghouse swing check 2

14. RCP Seal Injection Tag Nos. 1CS4860A,B,C,D 1CS4367A,B,C,D

- ICS4368A,B,C,D 2" Rockwell piston check 22

15. Boric Acid Filter to Centrifugal Charging Pumps Tag Nos. ICS4443 2" Rockwell piston check i

16. Domin. Water Makeup to Boric Acid Blonder Tag No.10S4429 2" Rockwell pisten check i

17. Miscellaneous law Usage Tag Nos. 14470 14487 14508 1CS 0109 1CS4433 10 S 4442 1CS4445 8486 8 KALSI ENGINEERING, INC. j wee osm a =vens

o DesmaantNo. tabs'- Enclosure to TXX-89849

-' November 84 3sg Page 32 of 61 g gg

18. N Goes than 3 inches)

Tag Nos. IVD 0604 1VIMI607 IVD 0608 IVD 0611-IVD 0612 i

IVD 0614 through 0690 1VD0641through 0644 1080096 1C80087 1087000 10S8180 1084200 -

108 8306 1088223 through 4229 1084369 1CS 8360A 108 83698 1Gi8369D 108 8303 108 8411 1CS-8436 1CS-8538 A through D 10S4642 A through D 1C84942 A XCS0037 XCS4039 XCS4041 XCS4044 e The valves in Group 17 were not analysed because they are used inhequently Gess than 5 percent of the plant operating cycle) or are used only during emergency plant operating conditions.

The analysis methods used in this application review are based on wear and fatigue calculations for relatively long term usage resulting from continuous flow operation.

Therefore, this analysis method is not appropriate for the low use check valves in this system. Esisting maintenance and test procedures should be followed for these valves.

The valves in Group 18 were not analysed because they are lens than two inches in size and are not nuclear safety related. Failure of these valves to perform their intended function will not jeopardias plant safety or operability.

Recommendations for the remaining valves are:

KALSI ENGINEERING. INC.

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kE Enclosure to TXX 89849 hM E Page 33 of 61 Pap 38 ,

1. BC2NormalChasstag Tag Nos.18878A,188788 Wear Inder: - 1 Fatigue Indes: 1 Comments: Law levels of disc oscillation. Oscillation and tapping at charging flow of 75 spm is possible. This valve design uses a very small dowel pin to prevent dise rotation which will be subject to accelerated wear if the disc is tapping, f p M annammm andaeansa. ,

One valve as a sample of the group every ti years. Check for wear and damage in these areas: ,

A) Hiny pin and bushings B) Disc to hiny connection C) Dise and seat D) Dise anti rotation pin

3. BC2 Altesnate Charglag 1

Tag Nos.18379A,183798 Wear Indes: 1 Fatigue Index: 1 Comments: Low levels of dise oscillation. Oscillation and tapping at charging '

flow of 75 gpm is possible. This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear if the disc is tapping.

Inspar*lan Paan=nwadation:

One valve as a sample of the group every 10 years. Check for wear and damage in these areas:

A) Hiny pin and bushings

. B) Disc to hiny connection C) Dise and seat D) Dise anti rotation pin "

l 8. BCSAusDiarySpray Tag No.1CS-8377 Wear Indes: N/A to lift checks Fatigue Index: N/A to lift checks Comments: Lift type check valves can be subject to piston chatter when the flow velocity is less than approximately 26% of Vmin which may result in seat damap, galling of the piston bore, and stuck pistons. Actual flow velocity through this valve is higher than this threshold at all charging flow rates. Therefore, no accelerated degradation is expected.

KALSI ENGINEERING, INC.

- MSC6 DetoN & esa6vens

Dosament No. 3834 Enclosure to TXX-89849 Novembet 90, M Page 34 of 61 p ,34 1& W-Follow normal maintenance and IST program requirementa-

4. Come ntamantlaana&= 0Penstastlos M.HI4 Tag No.18881 Wear Indes: 1 Fatigue Inden: 1 Comments: Low levels of dise oscillation. Oscillation and tapping at chargmg flow of 75 gpm is possible. This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear if the disc is tapping. .

InspareLam Baemenmandatinnt Once every 5 years. Check for wear and damage in these areas:

A) Hiny pin and bushings B) Disc to hing connection C) Dise and seat D) Dise anti rotation pin

5. HeatEachangerOutleta 5a. latdownEXtoI.atdown711 tar -

Tag No.18496 Wear Index: 1 Fatigue Index: 1 Comments: Low levels of disc oscillation. Oscillation and tapping at letdown flow of 75 gpm is possible. This valve design uses a very small dowel pin to prevent dise rotation which will be subject to accelerated wear if the disc is tapping.

Inspection Recormnandation:

In conjunction with Tag No.18454 (group 9), inspect one of the two every 5 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection C) Dioe and seat D) Dise anti-rotation pin 5b. LatdownBAmatEKOutist Tag No.17039 Wear Inder: 1 Fatigue Index: 1 Comments: Moderate levels of disc oscillation and tapping at 280 gpm. Low usage limits amount of wear and damage to valve internals. This MALSI ENGINEERING. INC.

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DesumasatMe. m Enclosure to TXX-89849 NeuberM m. Page 35 of 61 Page O valve design uses a very small dowel pin to prevent disc rotation which will be su% to meoelerated wear if the dise is tapping. ,

3,,,,,se, w a. % .

Once every 10 years. Cheek for wear and damap in these areas:

A) Hinge pin and bushings B) Disc to hinge connection -

C) Dine and seat D) Dise anti rotation pin 5c. Moderating Best P=ah==r- Outist to Imedown ChlDer HI Tag No.17068 -

Wear Index: 1 Fatigue Indes: 1 Comments: Low levels of disc oscillation and tapping at 75 gym. Low usage limits amount of wear and damage to valve internals. This valve design uses a very small dowel pin to prevent disc rotation whleh will be subject to accelerated wear if the disc is tapping.

1=W= Recommendation:

Once every 10 years. Check for wear and damage in these areas:

A) Hiny pin and bushings '

B) Disc to hinge connection C) Dise and seat D) Dise anti rotation pin

6. Ietdown to VCr and BRS Recycle Bold up Tank Tag Nos. 1 8417,1 8420 Wear Index: 1 Fatigue Index: 1 Comments: Low levels of disc oscillation and tapping at 120 gym. Low usage of 18420 further limits amount of wear and damage to this valve. This valve design uses a very small dowel pin to prevent dise rotation which will be subject to accelerated wear if the dise is tapping.

In@ hanennendmeinn.

18417: Every 10 years.

18420: Every 10 years.

Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection C) Dise and seat D) Dise anti rotation pin KALSI ENGINEERING, INC.

MSC6 DeteN S meas.vtse

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h====at No. 3834 Enclosure to TXX-89849.

--; . Nemmeber80, asse Page 36 of 61 Page88 i,

T. VanamoOsmentTankOudst

- Tag No.18440 Wear Inder: 1 Fatigue lades: 1 Comments: Low levels of disc oscillation at all flow rates. This valve design uses a very small dowel pin to prevent disc rotation which will be sutint te sooelerated wear if the dise is tapping.

Inspeedon manne-namandem, Once every 10 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection

C) Dise and seat D) Dise anti-rotation pin

8. RWSTtoVolume ControlTank Tag No.1-8546 Wear Index: 1 Fatigue Index: 1 Comments: Dise is oscillating at low levels. Low usage during 12 month period.

Inspection Reconumandation:

Once every 10 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection C) Dise and seat D) Dise anti. rotation pin

9. Cation Bed DomineralisertoVCT Tag No.18454 Wear Index: 1 Fatigue Index: 1 Comments: Low levels of disc oscillation and tapping at 75 gym letdown flow.

This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear if the disc is tapping.

Inspection haaannanAntlan.

In conjur.ction with Tag No.18496 (group 5b), inspect one of the two every 5 years.'

Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection C) Dise and seat D) Dise anti-rotation pin KALSI ENGINEERING, INC.

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g Do w No.lete Enclosure to TXX-09849 Novemberaq, tem Page 37 of 61 p , g7

10. P.D.ChargingPumpDischarge Tag No.1487 Wear Inder. 1 Fatigue Inder: 1 Comments: hw levels of disc oscillation and tapping at 75 spm charging flow. -

This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear due to predicted levels of disc tapping.

T p Emanam manAnt4mm.

Once every 10 years., Check for wear and damage in these areas:

A) Hinge pin and bushings '

B) Disc to hinge connection C) Disc and seat D) Dise anti-rotation pin

11. Baric Acid Tmasfer Pump Discharge Tag Nos.10S-8487, ICS.8473 Wear Index: N/A to lift checks Fatigue Index: N/A to lift checks Comments: Lift type check valves can 6 subject to piston chatter when the flow i velocity is less than approximately 25% of Vmin which may result in seat damage, galling of the piston bore, and stuck pistons. Actual flow velocity is higher than this threshold.

Inspection Recommendation:

Follow normal maintanance and test programs paying particular attention for signs of back leakage which may indicate a degraded seat or sticking piston.

12. ChiBerPumpDi : w Tag Nos.17050A,17050B Wear Inder: 1 Fatigue Inder: 1 Comments: Disc is oscillating at low levels and possibly tapping. Low use valve.

Tampereine RennenmanAntlan.

Once every 10 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection C) Dise and seat D) Disc hanger connection MALSI ENGINEERING, INC.

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N' E Eaelosure to TXX-89849

. 80,'M Page 38 of 61 Pass 80 l

l 1s. CentrengalCharglagPumpDesdberge Tag Nos.108 8400A,108 84808 Wear Inden: N/A to liR cheeks Fatigue Inden: N/A to lin eheeks

' Comments: Lin type check valves can be sulsect to piston chatter when the flow velocity is less than approximately 26% of Vania which may result in seat damage, galling of the pisten bore, and stuck pistens. Actual flow velocity through this valve is higher than this threshold at all charging flow rates. Therefore, no accelerated degradation is expected.

Jaapandam Bannemendaelrum. .

Follow normal maintenance and test programs.

Tag Nos.18481A,184818 Wear Index: 1 Fatigue Index: 1 Comments: Low levels of disc oscillation and tapping at 120 gpm. This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear if the disc is tapping.

Inspection Recommendation:

Once every 10 years. Check for wear and damage in these areas:

A) Hinge pin and bushings B) Disc to hinge connection -

C) Disc and seat D) Disc anti rotation pin

14. RCPSeallajection Tag Nos. ICS-8350A,B,C,D 1CS-8367A,B,C,D 1CS-8368A,B,C,D Wear Index: N/A to lia checks Fatigue Index: N/A to liA checks Comments: LIA type check valves can be subject to piston chatter when the flow velocity is less than approximately 25% of Vmin which may result in seat damage, galling of the piston bore, and stuck pistons. Actual flow velocity through this valve is higher than this threshold at all charging flow rates. Therefore, no accelerated degradation is expected.

Inspection Recom==ndation:

Follow normal maintenance and test programs.

KALSI ENGINEERING. INC.

McC6 OsDON & ANa vess

,_ _ -_ - . - - - - . . ~ . - - - - - - - - - - - - - -

Nm less Enclosure to TXX-89849

'- NE Page 39 of 61 Fage m

15. Borte Asid Faser to Osmestagal Charging Pugs Tag Nos.1C84448 l 1

Wear Indes: N/A to liA cheeks Fatigue Indes: N/A to 114 checks Commente: Lin type check valves can be subject to piston chatter when the flow velocity is less than approximately 26% of Vain which may result in seat damage, galling of the piston boro, and stuck pistens. Actual flow velocity through this valve is higher than this threshold at all charging i

flow raten. Therefore, no accelerated degradation is arpeeted. '

I=W RaaanenenAntian.

Follow normal maintenance and test programs.

18. Deada. Water Makeup to Boric Acid Blender Tag No. ICS4429 ,

l.

Wear Index: N/A to liA checks Fatigue Index: N/A to liA checks l Comments: Lin type check valves can be subject to piston chatter when the flow i velocity is less than approximately 25% of Vain which may result in I

seat damage, galling of the piston bore, and stuck pistons. Actual flow velocity through this valve is higher than this threshold at all charging flow rates. Therefore, no accelerated degradation is expected.

Inspection Paan==nandation:

Follow normal maintenance and test programs.

1 1'

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KALSI ENGINEERING, INC.

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h N* M ' Enclosure to TXX-89849'

.. Member 80,1008 Page 40 of 61 Page40

'IUElsetrie h4PeakSES Summary of Auxiliary Feedwater System November 2,1989 Revision 3 GeneralDiscussion There are a total of 40 check valves in the auxiliary feedwater system. They have been grouped into 11 categories:

Group Description Number 1 AFW Turbine Driven Pump Supply to SG 1 thru 4 4 Tag Nos. AF 0078, AF-0086, AF 0098, AF 106 4* Borg Warner swing check 2 AFW Motor Driven Pumps 1 and 2 Supply to SG 1 thru 4 4 Tag Nos. AF 0075, AF 0083, AF 0093, AF 0101 4" Borg Warner swing check 3 AFW Motor Driven Pumps 1 and 2 Discharge 2 Tag Nos. AF 0051, AF 0065 6" Borg Warner swing check '

4 AFW Turbine Driven Pump Discharge 1 Tag No. AF 0038 8" Borg Warner swing check 5 AFW Pump Miniflow Lines 3 Tag Nos. AF 0045, AF 0057, AF 0069 3" Borg Warner swing check 6 AFW Motor Driven Pumps Suction from CST 2 Tag Nos. AF 0014, AF 0024 6" Borg Warner swing check l 7 AFW Turbine Driven Pump Suction from CST 1 Tag No. AF 0032 8" Borg Warner swing check 8 AFW Pump Test Line Return to CST 1 l- Tag No. AF 0167

j. 8" Borg Warner swing check 9 Condensate Transfer Pump Discharge 1 Tag No. AF 0114 3" Crane swing check l

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DesunsetMa tens Enciosure to TXX-89849

.. November 30, asse Page 41 of 61 yng,41 10 Non Return from Domin. Water Makeup System 1 Tag No. AF 0009 8" Berg Warner swing check 11 Instrument Air Check Valves Tag Nos. AF 0215 through AF 0235 inclusive 1/2" Circle Seal Ball Check Valve 20 The valves in Group 11 were not analysed because they an less than two inches in size and are not nuclear safety nlated. Failure of these valves to perform their intended function will not jeopardise plant safety or operability.

Recommendations for these valve estegories are:

1. APW Turbine Driven Pump Supply to SG 1 thru 4 Tag Numbers. AF 0078, AF-0086, AF 0098, AF 106 Then an four inch Borg Warner swing check valves with pressure seal bonnets.

They are located 18 inches downstream from one inch diameter flow limiting orifices that have bnn tnated as high turbulence sources in this analysis. The valves are close

to clearway style swing checks, so higher flow velocities will be needed to fully open the disc. The internal valve design incorporates a small diameter stud threaded into and welded to the disc. At full opening, the dise stud contacts the bonnet at an angle that will l

develop high bending stress. Overall, this design will be more prone to fatigue problems should the flow velocity put the valve in the tapping range. Pressure seal bonnet valves have bun a regular source of sealing problems in the industry, particularly Borg Warner valves. No physical alignment method is provided to rotationally key the bonnet to the vaive body. Assembly of the valve requires extreme care by maintenance personnel to ensure proper bonnet to body orientation. Failure to exercise this care will result in the dise not seating and back leakage.

Recent experience at Comanche Peak also indicates that problems exist with proper vertical positioning of the bonnet / hinge arm / disc assembly in the valve body. This -

problem is manifested as extremely uneven overlap of the disc and seat which allows the top of the disc to catch inside the seat, mechanically binding the disc at a location far from the seat. Radiographs of the valves and measurements made of one disassembled valve all confirm this problem. Existing maintenance procedures supplied by Borg Warner do not adequately address these issues.

Based on the data supplied by Jay Ryan of CECO, the flow through these valves will be 241 gym. Typical usage is estimated to be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Additional operating time has been applied to secount for usage during hot functional tests. With these input conditions, the calculated wear and fatigue indices are both I (very low).

paen-mand =4ons Based on analysis and review of recent back leakage problems with these valves, recommend inspection of each valve prior to plant start up in order to netify the disc and seat alignment problems. Subsequent inspections should be conducted at 10. year intervals. During inspection, the following areas shculd be checked for wear and damage:

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DoeumentNo.1894 Enclosure to TXX-89849 Nooember 30,1919 Page 42 of 61 Page 48

_ A) Hinge pin and bushings B) Dise stud / hinge connection C) Dise and seat.

~

2. APW MateDetvem Pumps 1 and 2 Supply to SG 1 thmugh 4 Tag Nos. AF 0075, AF 0083, AF 0093, AF 0101 These are 4 inch Borg Warner swing check valves with pressure seal bor. nets. They are located 30 inches downstream from one-inch diameter flow limiting orifices that have been treated as high turbulence sources in this analysis. The vahes are close to clearway style swing checks, so higher flow velocities will be needed to fully open the disc. The intemal valve design incorporates a small diameter stud threaded into and .

welded to the disc. At full opening the disc stud contacts the bonnet at sn angle that will develop high opening and the disc stud contacts the bonnet at an angle that will develop high bendmg stress. Overall, this design will be more prone to fatigue problems should L the flow velocity put the valve in the tapping range. Pressure seal bonnet valves have been a regular source of sealing problems in the industry, particularly Borg Wamer h

valves. No physical alignment method is provided to rotationally key the bonnet to the valve body. Assembly of the valve requires extreme care by maintenance personnel to ensure proper bonnet to body orientation. Failure to exercise this care wil' result in the dise not seating and back leakage.

Recent experience at Comanche Peak also indicates that problems exist with proper vertical positioning of the bonnet / hinge arnddise assembly in the valve body. This problem is manifested as extremely uneven overlap of the dise and seat which allows the top of the dise to catch inside the seat, mechanically binding the disc at a location far from the seat. Radiographs of the valves and measurements made of one disassembled valve all confirm this problem. Existing maintenance procedures supplied by Borg Wamer do not adequately address these issues.

Based on the data supplied by Jay Ryan of CECO, the flow through these valves will be 268 gpm. Typical usage is estimated to be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Additional operating time has been applied to account for usage during hot functional tests. With these input conditions, the valve is predicted to be oscillating and tapping. The calculated wear index is 1 (very low) and the fatigue index is 2 Gow).

Recommandations Based on analysis and review of recent back leakage problems with these valves, recommend inspection of each valve prior to plant start up in order to rectify the disc and seat alignment problems. Subsequent inspections should be conducted at 10-year intervals. During inspection, the following areas should be checked for wear and damage:

A) Hinge pin and bushings B) Dise stud / hinge connection C) Dise and seat.

x KALSI ENGINEERING. INC.

tweSCMAO 0490** & m vess l

. . . . . . . . . . . . . . ,. __ , , . ~ - -

Desamentila. 3896 Enclosure to TXX-89849

.. 3se,emmhs,g agg Page 43 of 61 p ,, g l 8. APW8EstarDrivenPussps1and3DAnd-go Tag Nos. AP.0061, AF 0066 heee are sia inch Borg Warner swing cheek valves with pressure seal bonnets. %ey are loested eight inches downstream fkm downward facing ebws. he internal valve design incorporates a stud threaded into and welded to the dise. At full opening, the disc stud eentacts the bonnet at an angle that will develop high bending stress.

Overall, this design will be more prone to fatigue problems should the flow velocity put the valve in the tapping range Pressure seal bonnet valves have been a regular sourse of sealing problems in the industry, particularly Borg Warner valves. No phyalcal alignment method is provided to rotationally key the bonnet to the valve body.

Assembly of the valve requires extreme care by maintenance personnel to ensure proper bonnet to body orientation. Failure to exercise this care will result in the dise not seating and back leakage.

For additional problems encountered at Comanche Peak with valves of similar design, see the summaries in Sections 1 or 2.

Based on the data supplied by Jay Ryan of CECO, flow through these valves will be

- 536 gym. Typical usage is estimated to be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Additional operating time has been applied to account for usage during hot functional testa. Under these operating conditions, the disc is predicted to be oscillating at moderate levels.

The calculated wear and fatigue indices are both 1 (very low).

hansnmandatlana .

Based on analysis and review of recent back leakage problems with valves of this type, recommend inspection of each valve prior to plant start.up in order to verify proper disc and seat alignment. Subsequent inspections should be conducted at 10-year intervals.

During inspection, the following areas should be checked for wear and damage:

A) Hinge pin and bushings B) Disc stud / hinge connection C) Dise and seat.

4. AFW Tuhine Driven Pump Discharge Tag No. AF 0038 This is an eight. inch Borg Warner swing check valve with pressure seal bonnet. It is

. located 17 inches downstream from a pipe expansion that has been treated as a low turbulence source in this analysis. The internal valve design incorporates a small diameter stud threaded into and welded to the disc. At full opening, the dise stud contacts the bonnet at an angle that will develop high bending stress. Overall, this design will be more prone to fatigue problems should the flow velocity put the valve in the tapping range. Pressure seal bonnet valves have been a regular source of sealing problems in the industry, particularly Borg Warner valves. No physical alignment

- method is provided to rotationally key the bonnet to the valve body. Assembly of the valve requires extreme care by maintenance personnel to ensure proper bonnet to body orientation. Failure to exercise this care will result in the disc not seating and back leakage.

KALSI ENGINEER 8NG. INC.

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kN Enclosure to TXX-89849 i

., Nmmber M M - Page 44 of 61 Pap 44

J For additional problems enesuntered at Comanche Peak wif.h valves of similar design, ese the summaries in Sostions 1 or 2.

Based en data provided by Jay Ryan of CECO, flow through this valve will be 964 spm.

Typical anage is estimated to be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Additional operating time has been applied to aseoant for usap during hot functional tests. . Under thue operating conditinns, the disc is predicted to be tapping against the valve bonnet and oscillating at non to moderate levels. Because the unap is very low, calculated wear and fatigue indbes are both 1 (very low).

MannemanamAme&gg Based on analysia and review of recent back leakage problems with valves of this type, recommend inspu+ ion of this valve prior to plant start up in order to verify proper disc and seat alignment Subsequent inspections should be conducted at 10 year intervals. '

During inspection, the following areas should be checked for wear and damage: ,

A) Hinge pin and bushings B) Dise stud and stud /hiny connection C) Dise and seat. +

5. AFW Pump Miniflow Lines Tag Nos. AF 0045, AF 0057, AF 0069 These are three inch Borg Warner swing check valves with pressure seal bonnets.

They are located 9 to 18 inches downstream from flow limiting breakdown orifices that have been tmated as high turbulence sources in this analysis. These valves are close to clearway style swing cheeks, so higher flow velocities will be needed to fully open the disc. Based on the data provided by Jay Ryan of CECO, the flow through these valves will be 94 to 95 gpm. Typical usage is estimated to be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year,

-Additional operating time has been applied to account for usage during hot functional tests. Under these operating conditions, the disc is predicted to be oscillating at high levels and tapping against the stop. Even with low usage, the calculated fatigue index is 5 (very high) due to high stresses developed when the disc is tapping. The wear index is 1 (very low) due to the combination of high wear meistance materials used in the hinge pin area, low usap, and low contact loads in this small valve.

l' The valve design has a large diameter stud threaded into the dise which is then mduced in diameter above the hiny arm. While mis has the benefit of reducing stress at the stud to disc junction, it serves to shift the high stress area to the step in the stud.

Additionally,when the stud contacts the sup during tapping, the angle between the disc stud and the bonnet extension creates a larp moment arm which will create unnecessarily high bending strus in the stud. Therefore, the step becomes the area prone to fatigue failure and will govern the fatigue life of the valve. These design features make the valve more susceptible to fatigue problems whenever the flow velocity puts the valve in the tapping range. One way in which this problem can be minimized would be to increase the entire stud to to 5/8" diameter, thus eliminating the step. Fatigue life can be gnatly enhanced as shewn in Table 5.

MALSI ENGINEERING, INC.

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DesummentMs. See M m umber 80,1809 Enclosure to TXX-89849 peg,(g Page 45 of 61 TABLE 6 Comparative Fatigue Lifr of Alternate Disc Stud Designs for Ausiliary Feedwater Pump Miniflow Check Valves (Hours) 3/8" & 5/8" Stepped 1/2" & 5 8" Stepped 5/8" Stud I Stud sign Stud W (Redesign Option)

(Original Design) (Redesign Option)

AF 0045 279 19 9 >106 AF 0067,0069 5 4W 53,tl57 *

'!he fatigue life calculated by CVAP is based upon the ASME Boiler & Pressure Vessel Code, Section 3 fatigue fsuuza curve. This means that , based upon the conditions i

analysed, the parts would be expected to survive for the periods of time presented in Table I as a minimum. Because so many physical variables can have an impact on fatigue life calculations, the failure curve is obn a very conservative means of estimating the life of a component. Certain test cases have exceeded the life predicted on this basis by a factor of 20 to 1 as documented in the ASME Code. Nevertheless, because of the uncertainties involved in quantifying stresses, part geometry, material strength, corrosion effects, etc., this approach must be taken to ensure conservatism. ;

Additional life increases could be achieved by altering the design of the bonnet stop extension so as to reduce the contact angle between the stud and stop thus reducing the bending stresses whenever contact occurs.(see Figure 1). A more effective volution would be to eliminate the tapping altogether by increasing the length of the stop. This would force the disc further into the flow stream at the fully open position holding it firmly against the stop.

KALSI ENGINEERING, INC.

MGCmAMCA6 DetcNE ANA6vess

hk M Enclosure to TXX-89849

<- Messeber% M Page 46 of 61 Page46 1

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+ a Existing Stop Design I I

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Revised Stop Design Figure 1 Pressure seal bonnet valves have been a regular source of sealing problems in the industry, particularly Borg Warner valves. No physical alignment method is provided to rotationally key the bonnet to the valve body. Assembly of the valve requires extreme care by maintenance personnel to ensure proper bonnet to body orientation. Failure to exercise this care will result in the dise not seating and back leakage.

Recent experience at Comanche Peak also indicates that problems exist with proper vertical positioning of the bonnet / hinge arm / disc assembly in the valve body. This problem is manifested as extremely uneven overlap of the disc and seat which allows the top of the disc to catch inside the seat, mechanically binding the disc at a location far MALS8 ENGINEERING, INC.

we e osee a = vo.

m Desumes4 Na. 38B4 Enclosure to TXX 89849

'. November 80,19# Page 47 of 6L Page 47 hem the aset. Radiographs of the valves and measurements made of one disassembled valve all esents this problem. Furthermore, AF 0069 eahibited signs of considerable damap, such as a bent and peonod dise stud and impact depressions on the disc stop, due to tapping or slamming open during pump start up.

wea Based on analysis and review of recent back leakap problems with similar valves and inspection of AF 0069, inspection of each valve prior to plant start up is recommended in order to rectify the disc and seat alignment problems. The valves are also candidates for design revision to eliminate the dise tapping problem at the design flow rate. If not corrected, these valves are likely to sufer kom exceptionally short life because of the high stresses developed during tapping. During inspection, the following areas should be checked for wear and damage:

A) Hiny pin and bushings B) Dise stud and stud / hinge connection :

C) Dise and seat. !

t

8. AFW MotorDuiven Pumps Suetion ihna CBI' -

Tag Nos. AF.0014, AF 0024 These are six inch Borg Warner swing check valves with bolted bonnota. They are located 114 inches downstream from a locked.open gate valve. Internal valve design incorporates a small diameter stud threaded into and welded to the dise. At full -

L opening, the disc stud contacts an extension welded to the bonnet at an angle that will develop high bending stress. Overall, this design will be more prone to fatigue problems should the flew velocity put the valve in the tapping range Care must be exercised to ensure proper alignment of the bonnet during assembly.

l' Flow through these valves is 536 gpm, and typical usage would be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Under these operating conditions, the disc is predicted to be oscillating at low ;

levels. Coupled with low usage, the calculated wear and fatigue indices are both 1 (very '

low),

Recommandations Based on analysis, recommend inspection of one valve as a sample of the group at 10 year intervals. During inspection, the following areas should be checked for wear and damage:

i A) Hinge pin and bushings i B) Dise stud and stud / hinge connection C) Dise and seat.

7. AFT Turtdne Driven Pump Suction from CST Tag No. AF 0032 This is an eight inch Borg Warner bolted bonnet swing check valve. It is located 18 inches downstream from a locked open gate valve. The internal valve design incorporates a small diameter stud thresded into and welded to the disc. At full KALSI ENGINEERING. INC.

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W. Desensat Na. nme Enclosure to TXX 89849 i

.. November 8% 180D Page 40 of 61 Page 48

- opening, the dies stad sentacts an extension welded to the bonnet at an angle that will develop high bending stress. Overell, this design will be more prone to fatigue problems should the flew velocity put the valve in the tapping range, Care must be eseralsed to ensure proper alignment of the bonnet during assembly.

Flow through this valve is 964 spa. Typical usep would be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year.

, Under these operating conditions, the disc is predicted to be oscillating at low levels, l

Coupled with low usage, the calculated wear and fatigue indices are both 1 (very low).

t ,

Based on analysis, recommend inspection of this valve at 10 year intervals. During

l. inspection, the following areas should be checked for wear and damage:

l A) Hinge pin and bushings .

l B) Dine stud and stud / hinge connection C) Dine and seat, l

8. APWPumpTestIJaeReturn toCirr Tag No. AF 0167 This is an eis, .rinch Borg Warner bolted bonnet swing check valve. It is located 12 inches downstream from a downward facing elbow, .The internal valve design incorporates a small diameter stud threaded into and welded to the disc. At full opening, the disc stud contacts an extension welded to the bonnet at an angle that will

. develop high bending stress. Overall, this design will be more prone to fatigue problems should the flow velocity put the valve in the tapping rance. Care must be exercised to ensure proper alignment of the bonnet during assembly.

Flow through this valve will be either 536 or 964 gpm, and typical usage would be less than 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months per year. Under these operating conditions, the disc is predicted to be oscillating at low to moderate levels. Coupled with low usage, the calculated wear and fatigue indices are both 1 (very low).

Recomunendations L

Based on analysis, recommend inspection of this valve at 10-year intervals. During inspection, the following areas should be checked for wear and damage:

A) Hinge pin and bushings B) Disc stud and stud / hinge connection C) Dine and seat.

9. CondensateTsunsferPumpDischarge Tag No. AF 0114 This is a three inch Crane bolted bonnet swing check valve. It is located 2.5 inches downstream from an upward facing elbow. At full opening, the disc stud contacts the inside wall of the valve body. Flow through this valve is 200 gpm, and typical usage would be less than 200 hours0.00231 days 0.0556 hours 3.306878e-4 weeks 7.61e-5 months per year. Under these operating conditions, the disc is predicted to be fully open. The calculated wear and fatigue indices are both 1 (very low).

ICALSI ENGINEERING, INC.

deCHANaCAL OgseN s aNALves

DoemasatNo. ame I0 November 8% 388 9, ['f t TXX-89849 l<a t

Based on analysis, resemmend inspection et this valve at 10 year intervals. During inspecties, the $stlowing areas should be ehecked for wear and damage:

A) Ringe pin and bushings B) Dise stud and stud / hinge connection C) Dise and esat.

10. NonEstem AmenDemia.WaterMakeUp System Tag No. AF 0000 This is a three-inch Borg Warner bolted bonnet swing check valve. It is located 12 inches downstream f>om a gate valve. The intamal veJve design incorporates a small .

- diameter stud threaded into and welded to the dise. At full opening, the diu stud contacts an estension welded to the bonnet at an angle Gat will develop high bading stress. Overall, this design will be more prone to fatque problems should the flow velocity put the valve in the tapping range. Care aust be esereised to ensure proper alignment of the bonnet during assembly, Flow through this valve is between 100 sad 200 spm and typical usage would be less than 200 hours0.00231 days 0.0556 hours 3.306878e-4 weeks 7.61e-5 months per year. Under these operating conditions, the disc is predicted to be oscillating or oscillating and tapp!ag at low levels. Coupled with low usage, the calculated wear and fatigue indices are both 1 (very low).

WannensnandatAnna -

Based on analysis, recommend inspection of this valve at 10 year intervals. During inspection, the following areas should be checked for wear and damage:

A) Hinge pin and bushings B) Dise stud and stud / hinge connection C) Dise and seat.

KALSI ENGINEERING. INC.

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hE Enclosure to TXX 89849

%# Page 50 of 61 40

'IUBerete ComamebePeakSES,Umk1

, Summary of Main Steam System July 14,1900 Revision 0 i

gene,31gy d s

There are a total of 14 check valves in this system. by have been grouped into the following four estegories:

Dueription Number

1. Steam Supply to Main Feed Pump Turbines

Tag Nos.1MS-0226, IMS.0232 14" Crane swing check 2

2. Steam Supply to Aus Feed Pump Turbine Tag Nos. IMS-0142, IMS-0143 4" Borg Warner swing check 2

3. Auxiliary Steam Supply to MSR Tag Nos. IMS 0453,IMS 0456 2" Rockwell lift check 2

4. Miscellaneous dess than 2") ;

Tag Nos. IMS 0680 through IMS 0687 8 l

The valves in Group 3 were not analyzed because they are used infrequently dess than 5 percent of the plant operating cycle) or are used only during emergency plant operating conditions.

The analysis methods used in this application review are based on wear and fatigue l

i calculations for relatively long. term usage resulting from continuous flow operation.

Therefore, this analysis method is not appropriate for the low use check valves in this system. Existing maintenance and test procedures should be followed for these valves.

1' l The valves in Group 4 were not analyzed because they are less than two inches in size and L are not nuclear safety related. Failure of these valves to per form their intended function L will not jeopardize plant safety or operability.

I Recommendations for each category are:

1. Sleam Sigipty to Main Feed Pump Turbines Tag Numbers. IMS 0226, IMS-0232 Wear Index: 4 Fatigue Index: 1 Comments: Calculated Vmin is 185 fps, while actual flow velocity through these valves is 107 fps. This results in moderate levels of disc oscillation which combined with continuous usage could cause high hinge pin wear, i

l KALSI ENGINEERING. INC.

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bE Enclosure to TXX-89849

. OE Page 51 of 61 Pass 51 hspeeden One as a semple of the group every refueling outage to cheek for wear and damage in the following areas:

A) Hinge pin and bushings a) Din and seat C) Dise hanger bracket bolts

2. Semem9gptreo/anFoodPemp'hrtdne Tag Numbers l'AS-0142, IMS4143 Wear Indez: 1 Fatigue Index: 1

Comments: Calculated Vmin is 77 fps, while actual flow velocity through these valves is 12 f>s. This results in moderate levels of disc oscillation.

14w usage of these valves, howmr, results in very low 1 mis of hinge pin wear. This particular Borg Warner valve is not as susceptible to dise stud fatigue problems as most of the others because

of as unwe .t.p design.

L Inspection Recommendation:

One as a sample of the group every 10 years to check for wear and damage in the following areas: ,

A) Hinge pin and bushings B) Dise and seat C) Dise stud and stud bushing L

l KALSI E'ABOINEERING, INC.

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DesumentNo.1GN Enclosure to TXX-89849

._ November 80,1889 Page 52 of 61 Pags 83 '

e

'IU Becestohe Peak SES, Unit 1 I Summary of Main Feedwater System !

Juh6,1989 Revision 0 !

M %a usamba There are a total of 18 check valves in this system. They have been grouped into the following 5 categories: 1 Desmiption Number

1. _ Main Feedwater Pump Discharge Tag Nos. FW 0006, FW 0013 20" Crane tilt disc 2

2. Main Feedwater Containment Isolation Tag Nos. FW 0070, FW 0076, FW 0082, FW-0088 18" x 16*x 18" Rockwell tilt dise 4

3. Bypass Line Containment Isolation Tag Nos. FW 0191, FW 0192, FW 0193, FW 0194 6" Borg Warner swing check 4 l 4. Bypass Line Containment Isolation '

Tag Nos. FW 0195, FW 0196, FW-0197, FW 0198 6" Borg Warner swing check 4

5. Bypass Line Containment Isolation Tag Nos. FW 0199, FW 0200, FW 0201, FW 0202 6" Borg Warner swing check 4 Recommendations for each category are:

1. Main Feedwater Pump Discharge Tag Numbers. FW 0006, FW 0013 Wear Index: 1 Fatigue Index: 1 Comments: Flow velocity through these valves is 26 fps. This provides a 44%

margin over the calculated minimum velocity of 18 fps resulting in a fully open dise. Valve body and disc are both low carbon steel which combined with the feedwater temperature, chemistry, and high flow velocity makes these valves candidates for erosion /

corrosion problems (EPRI guideline 2.4.1).

kW_ Recommendation:

Ultrasonic measurements of valve body wall thickness can be used to establish material loss rates. This information can then be used to predict when minimum wall thickness requirements will be violated. Initial inspections should be made at each KALSI ENGINEERING, INC-Lac e oeso~s = vee

DesumentNa m - Enclosure to TXX 89849 Nonmher 30,185 - Page 53 of 61 Pese C3 rebeling. Physical inspection of valve internals should also be made at this time. For '

further information, refer to EPRI Cheek Valve Application Guidelines 2.1.3, Structural Compatibility and Cerrosion Allowanee, and 2.4.1, Erosion . Corrosion of Carbon Steel Cheek Valve Parta.

2. - Main Feedwater ca=*=h== mat Isolation Tag Numbers FW 0070, FW 0076, FW 0082, FW 0088 Wear Index: ~1 Fatigue Index: 1 Comments: Dise is oscillating and tapping at low levels, but does not result in significant degradation. Valve body is low carbon steel which combined with the feedwater temperature, chemistry, and high flow velocity makes these valves candidates for erosion /corroshn

problems (EPRI guideline 2.4.1).

l Inspendan hnnensmanAndam.

Li Ultrasonic measurements of valve body wall thickness can be used to establish material loss rates. This information can then be used to predict when minimum wall thickness requirements will be violated. Initial inspections should be made at each -

refueling. - Physical inspection of valve internals should also be made at this time. For further information, refer to EPRI Check Valve Application Guidelines 2.1.3, Structural Compatibility and Corrosion Allowance, and 2.4.1, Erosion Corrosion of Carbon Steel Check Valve Parts. -

3. Bypass Ilse Cont =Invaant Isolation Tag Numbers FW-0191, FW 0192, FW 0193, FW 0194 Wear Index: 1 Fatigue Index: 1 Comments: Flow velocity through these valves is 12.6 fps. This provides a 21%

margin over the calculated minimum velocity of 10.4 fps resulting in a fully open disc. Valve body is low carbon steel which combined with the feedwater temperature, chemistry, and high flow velocity makes these valves candidates for erosion / corrosion problems (EPRI guideline 2.4.1). Relatively low usage during cold start up, hot shutdown, and hot standby operations will mitigate the erosion / corrosion problems, i

Inspection haa======dation:

Ultrasonic measurements of valve body wall thickness can be used to establish material loss rates. This information can then be used to predict when minimum wall thickness requirements will be violated. Initial inspections should be made at each refueling. Physical inspection of valve internals should also be made at this time. For further information, refer to EPRI Check Valve Application Guidelines 2.1.3, Structural Compatibility and Corrosion Allowance, and 2.4.1, Erosion Corrosion of Carbon Steel Check Valve Parts.

1 KALSI ENGINEERING, INC.

8.eSCMMacan. De ssGN & mvess

Desummem6 Me.1884 Enclosure to TXX-89849

.- Nenumber80,1900 Page 54 of 61 Pass 84 e

4. %psesIAnehaai====*1sohdion Tag Numbers FW4196, FW 0196, FW4197, FW 0198 I I

Wear lades: 1 1 Fatigue Indes: 1 Comments: Then valves will be oscillating at low levels during auxiliary .

feedwater system operation and fully open during main feedwater I l.' bypass flow. Valve body is low earbon steel which combined with the

' feedwater temperature, chemistry, and high flow velocity makes these valves candidates for erosion / corrosion problems (EPRI guideline 2.4.1). Relatively low usage during cold start up, hot shutdown, and hot standby operations as well as auxiliary.

feedwater system use will mitigate the erosion / corrosion problems.

T==paa*ia= P-====dation:

l Ultrasonic measurements of valve body wall thickness can be used te establish I material loss rates. This information can then be used to predict when minimum wall thickness requirements will be violated. Initial inspections should be made at each

- rebling. Physical inspection of valve internals should also be made at this time. For

further information, refer to EPRI Check Valve Application Guidelines 2.1.3, l Structural Compatibility and Corrosion Allowance, and 2.4.1, Erosion Corrosion of l} Carbon Steel Check Valve Parts.

5. Bypass IJae Contain===t Isolation Tag Numbers FW 0199, FW 0202, FW 0203, FW 0204

- Wear Index: 1-Fatigue Inder: 1 <

Comments: These valves will be oscillating at low levels during auxiliary feedwater system operation, tapping at low levels during main feedwater tempering flow, and fully open during main feedwater bypass flow. Valve body is low carbon steel which combined with the feedwater temperature, chemistry, and high flow velocity makes these valves candidates for erosion / corrosion problems (EPRI guideline 2.4.1).

Inspection Recommendatica:

Ultrasonic measurements of valve body wall thickness can be used to establish material less rates. This information can then be used to predict when minimum wall thickness requirements will be violated. Initial inspections should be made at each refueling. Physical inspection of valve internals should also be made at this time. For l

further information, refer to EPRI Check Valve Application Guidelines 2.1.3, Structural Compatibility and Corrosion Allowance, and 2.4.1, Erosion Corrosion of L Carbon Steel Check Valve Parts.

A) Dise stud and stud to dise connection B) Dise stud bushing and washer C) Material loss (wall thinning) in the valve body.

MALSI ENGINEERING, INC.

wc= = osem w e.e

M N' 1888 Enclosure to TXX 89849 l

November 30, m Page 55 of 61 Page65 l

i TUElseerlo.Coman&s Peak BRE, Unit 1 i Summary of Residual Heat Removal System l Juh11,1989 Revision 0 !

L L GeneralDiscussion There are a total of 6 check valves in this system. They have been grouped into the following thru categories:

DesMytian Number

1. RHR Pump Discharp '

Tag Nos.18730A,18730B 10" Westinghouse swing check 2

2. From RWST to RHR Pump No. 2 Suetion Tag Nos.18958A,18958B 14" Westinghouse swing check 2

3. Miscellaneous (less than 2")

Tag Nos.1RH.8705A,B 3/4" Rockwell lift check 2 The valves in Group 3 were not analyzed because they are less than two inches in size and are not nuclear safety related. Failure of these valves to perform their intended function will not jeopardise plant safety or operability.

Recommendations for each category are:

1. RERPumpDischarge Tag Numbers.18730A,18730B Wear Index: 1 Fatigue Index: 1 Comments: Flow velocity through these valves is 5 fps at 1000 gym and 19 fbs at 3800 rpm. Calculated Vmin is 7.1 fps. The valve will be fully open at 3800 gpm (normal flow rate) and tapping at 1000 gym. This valve uses an unusually small dise anti rotation pin which may deteriorate prematurely due to disc flutter. Cumulative hinge pin wear will be-

.,, very low since valve usage is relatively low during a plant cycle.

1==p=a*4a= Paaa=====dation:

One as a sample of the group every 5 years to check for wear and damage in the following areas:

A) Dise anti. rotation pin B) Dise and seat C) Disc stud connection D) Hinge pins and bushings KALSI ENGINEERING. INC.

McCMAMCAA DeenON & ANA6 vests

1

, Desmasm4No. 3#4 Enclosure to TXX-89849

s NevenuherM 389 Page 56 of 61 Pass M S. . PhasWWWFtoEER PussySeedom Tag Numbers.18064A,189689 Wear Indes: 1-Fatigue lades: 1 Comments: Flow velocity through these valves is 14 f>s. This provides a 46%

margin over the calculated minimum velocity of 7.7 fps resulting in a i fully open diee. This valve uses an unusually small disc anti rotation -

pin which may deteriorate prematurely due to disc flutter. Cumulative )'

hinge pin wear will be very low since valve usage is relatively low I during a plant cycle. I 1

Imagnesq64mm Rmansensumandmelmen*

One as a sample of the group every 5 years to check for wear and damage in the following areas:

A) Dine anti rotation pin - I B) Dise and seat C) Dise stud connection D) Hinge pins and bushings i

KALSI ENGINEERING, INC.

McCre4NICab OseeN & aNa6vois

- - -u--____- _ m - _ _ _ _ ,.--__-_-__u - -- -v- ---=-e~+ - - + = ' - - -+

W Ik E Enclosure to TXX 89849 !

, Meesher as,ISS Page 57 of 61 Pass 87 !

'IUElecer4> Commaaske PeakMVatt1 Summary of Safety 14estian System '

Neveanbar 4,1989 Revision 1 Genesalp here are a total of 63 check valves in this .vstem. They have been grouped into the

following 11 estagories:

1 Dean @ Number

1. Safety Irdeetion Pump Discharge Tag Nos.14922A,18922B 4" Westinghouse swing check 2 l

l 2 Cold Leg Irdection Isolation l

Tag Nos.14818A,148188,148180,14818D

! 6" Westinghouse swing check 4 1

3. RHR Heat Exchanger to RCS Hot 14gs 2 & 3 Tag Nos.18841A,186418 .

0" Westinghouse swing check -

2

4. From Safety injection Pumps to RCS Hot legs Tag Nos.14949A,14949B,14949C,18949D 6" Westinghouse swing check 4

5. From RHR Heat Exchanger to Charging Pump Suetion Ta No.18969A 8" Wutinghouse swing check 1

6. From RMR Heat Exchanger to Safety injection Pump Tag No.1.ao69B 8" Westinghouse swing check 1 <

7. RCS Cold 14g Injection Tag Nos.14948A,14948,14948C,14948D 10" Westinghouse swing check 4

8. Accumulater Tank Discharge Trg Nos.14986A,14966B,14966C,14956D 10" Westinghouse swing check 4 l 9. From SIS RWST to Safety injection Pump Suetion l Tag No.14926 8* Westinghouse swing check 1 l

KALSI ENGINEERING. INC.

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DesumeWale.154 Enclosure to TXX 89849 i

. Nasesser80,109 Page 58 of 61 I PassC3 3

l l

10. Essenaneens 14w Usage Valves !

i No.14818 l 8' estihsbesse swing shoek 1 (

11. Miesellaneens (3* er less) i Tag Nos.1814140 18 4141 l 15 4181 !

15415 18 4185 !

i 15 4188 18I4 106 15 4187 15 4108 L is41ee i 181481E through D 1SI400E through D 181490E through D 1

1814919A through D '

1814D40A iS!46408 IS!496M through D i 1SI 89668 ISI49es .

m The valves in Gro a 10 were not analysed because they are und infrequently Gess than 5 ,

percent of the plan s perating cycle) or are used only during emergency plant operating '

conditions.

The analysis methods used in this application review are based on wear and fatigue calculations for relatively long. term usage resulting from continuous flow operation. ;

Therefore, this analysis method is not appropriate for the low use check valves in this .

l system. Existing maintenance and test procedures should be followed for thue valves.

The valves in Group 11 were not analysed because they are less than two inches in size and are not nuclear safety related. Failure of these valves to perform their intended function will not jeopardise plant safety or operability.

! Recommendations for each category are:

1. BefolyIqbattanPumpDiesharge Tag Numbers.18922A,149228 Wear lades: 1 Fatigue Inder: 1 Comments: Valves are fully open in all modes. Flow velocity provides very adequate margin over Vmin required.

I lampactica Maansummmanulat4nn.

One valw as a sample of the group every lo years. Check for wear and damage in these areas:

KALSI ENGINEERINS. INC.

owetCHANICAL 00 EON & ase46vtal

- L_. -, .-- , _ . - . . .

Desumsm4No. W 31esember 80, IBM Enclosure to TXX 89849

Page 59 of 61 yng O A) Dime anti rotaden pin B) Dise and seat C) Dime send eennection D) Binge pin and bushings

s. candtastedestisminolation Tag Nusabers.14414A,148188,14818C,14818D Wear lades: 1 Fatigue Inden: 1 Comments: Valves are fully open in all modes. Flow velocity is very high based on RER pump flow.

, laspeedom hd=*'a=*

L One valve as a sample of the group every 10 years. Check for wear and damage in these areas:

l A) Dine anti rotation pin B) Dies and seat C) Dine stud connection D) Hinge pin and bushings

3. RER Heat Mamperto RCE Bot tags 2 & 3 Tag Numbers.14841A,188418 .

Wear Inden: 1 Fatigue Index: 1 Comments: Valves are fully open. Flow velocity is very high based on RHR pump flo w.

Inspeedom P--dadon:

One valve as a sample of the group every 10 years. Check for wear and damage in these i

areas:

A) Dise anti rotation pin B) Dise and nat C) Dise stud connection D) Hinge pin and bushings

4. Fnsa SmAuly kdestion Pumps to RCE Bat tags Tag Numbers.18949A,18949B,18949C,14949D Wear indez: 1 Fatigue Inder: 1 Comments: Valves are predicted to be tapping at all flow rates.14w usage limits amount of wear and damage to valve internals. This valve design uns a very small dowel pin to prevent disc rotation whieb will be suksect to accelerated wear if the disc is tapping KALSI ENGINEERING. INC.

hasCom OS 90.e a mves

- Enclosure to TXX 89849 e hM E Page 60 of 61 MO o ,

One vake as a sample of the group every 5 years. Cheek lier wear and dasaap in these areas:

A) Dine anti retation pin

' B) Dise and seat C) Disc stud eennection i

D) Hinge pin and bushings '

e

5. FWees RER East Eminaapur en Omarglag % Suet 6am Tag Number 18969A Wear Index: 1

Fatigue Inder: 1 Comments: Valve is predicted to be tapping. law usage limita amount of wear and damage le valve intamals. This valve design uses a very small dowel j pin to prevent disc rotation whleh v.ill be suhket to accelerated wear if i I

the disc is tapping.

x p g.,wa co..

Once every 10 years. Check for wear and damage in these areas:

A) Dise anti rotation pin B) Dine and seat

C) Dise stud connection D) Hinge pin and bushings S. Fnan RER Beat Many-to Safety f=>r*4a= Pump Tag Number 18969B Wear Index: 1 Fatigue Indes: 1 Comments: Valve is predicted to be oscillating and tapping. Low usage limits amount of wear and damage to valve internals. Stresses developed in the disc stud from tapping are not high enough to cause fatigue failure.

This valve design uses a very small dowel pin to prevent disc rotation which will be subject to accelerated wear if the disc is tapping.

npam a.

Once every 10 years. Check for wear and damage in these areas:

A) Dioe anti rotation pin B) Dine and seat C) Dise stud connection D) Hinge pin and bushings ICALSI ENGINEERING. INC.

wem mesm a =e.

Desuenant 90s. 334 Enclosure to 1XX 89849

. Nessuber 44,las Page 61 of 61 png,31 ;

7. St3 0midlag M Tag Numbers.14D44A,1 4D488,14948C,1 8MSD Wear ladsa: 1 Fatigue ladsa: 1 Comments: Valva are fully open in all modes. Flow velocity provides eon- ;

siderable margin over Vain requirements.

laspeeden W t Ont valve as a sample of the group every 10 years. Check ter wear and damage in these ,

ereas:

A) Dine anti rotation pin

3) Dies and seat ,i C) Dine stad e:nnection 1

D) Hinge pin and bushings l

l 8. W=d=*-ThakDisebarge ;

j Tag Numbers.14986A,149668,14956C,14966D !

l Wear Inden: 1 j Fatigue Index: 1 i

Comments: Analysis methods used in this review are not applicable to these valves !

due to the indeterminate nature of the flow during core. flood um. l These valves have a very low Vmin requirement and a relatively low j Cv. Therefore, pressure drop across these valves will be higher as

esapared to many other check valves. !

1=W Recommasadadam.* '

i Follow existing maintenance and IST program requirements.

! 9. Fma RER Best Rehmayor to Safety hdection Pump Sucatan Tag Number 189698 !

I Wear Index: 1 Fatigue Index: 1 -

Comments: Valve is predicted to be ouillating and tapping. Low usage limits 5 amount of wear and damage to valve internals. Stresus developed in the disc stud from tapping are not high enough to cause fatigue failure.

his valve design uns a very small dowel pin to prevent dise rotation which will be subject to accelerated wear if the disc is tapping.

vp .

Once every 10 years. Check for wear and damage in these areas:

A) Dise anti rotation pin B) Dise and seat C) Dise stud eennection D) Hinge pin and bushings KALSI ENGINEERING. INC.

MEIC>epeCALDatulpv6 m vos

_ , __ . . . - _ , _ _ . ~ , _ . _ . _ _ , _ . . _ _ , _ . _ _ _ - . . , . . _ . _ _ . . . _ . _ . _ .. ,_. . __ -

ML19354D647

Text

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