ML17298B010

Summary of 840320 Meeting W/Util C-E,Bechtel & Grs in Bethesda,Md Re Updated Status on Evaluation of Hot Functional Testing Anomalies & Discussion of Problems W/Lpsi Pumps.Viewgraphs Encl

ML17298B010
Person / Time
Site:	Palo Verde
Issue date:	04/27/1984
From:	Licitra E Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8405160521
Download: ML17298B010 (73)

Text

Docket Nos.:

50-528, 50-529 and 50-530 APRg> QN APPLICANT:

Arizona Public Service Company FACILITY:

Palo Verde, Units 1, 2 and 3

SUMMARY

OF MEETING CONCERNING TESTING OF PALO VERDE COMPONENTS A meeting was held on March 20, 1984 in Bethesda, Maryland with representatives of the applicant and Combustion Engineering (CE).

The purpose of the meeting was to provide the staff with (1) an updated status on the evaluations of the hot functional testing anomalies which occurred at Palo Verde Unit 1 and (2) a discussion of the problems encountered with the Low Pressure Safety Injection (LPSI) pumps.

(Previous status reports on the hot functional testing evaluations were presented at meetings held on August 17 and October 12, 1983.)

Enclosure 1

lists the attendees for the meeting and Enclosure 2 includes the viewgraphs used during the presentation.

The meeting is summarized as follows.

Thermal Sleeves The applicant has completed the removal of the thermal sleeves from Palo Velde Units 1 and 2.

In addition to the thermal'sleeves in safety injection lines (4 sleeves per unit), the applciant also removed the sleeve from the pressurizer surge line since the usage factor in this line without the sleeve in is also significantly below 1, as is the case with the safety injection lines.

The thermal sleeve in the charging line will remain.

The applicant stated that it would submit additional information to the staff relating to the removal of the presurizer surge line thermal sleeves.

Thermowells Testing of the modified thermowell design at the CE facilities has been completed.

The results showed that (1) the natural frequency of the thermowell tip is about 2400 hertz, (2} a vortex shedding frequency of about 700-800 hertz occurs at the 70 to 80 ft/sec flow range, (3) vortex shedding loads were absorbed without causing overstress or fatigue, and (4) no wear occurred.

84OSSSOsar 8404m PDR ADOCK 05000528 A

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Installation of the modified thermowell design has been completed in Palo Verde Units 1 and 2.

This design will be checked out as part of the objectives of the demonstration test to be performed on Palo Verde Unj,t 1 in June 1984.

~RCS Pum s

Testing of the modified full scale prototype pump has been completed at the CE facilities.

'The results indicated that the modified design showed that (1) there was no evidence of cavitation, (2) diffuser bolt strains were significantly

reduced, (3) there was no indication of any defects in the impeller as a result of'esting, and (4) hydraulic performance met design requirements.

Following installation of"the modified pumps in Unit 1, the modified design will also be checked out during the plant demonstration test to be performed in June 1984.

CES Shrouds The hydraulic and mechanical tests of the CEA shroud tubes and assembly have been completed at the CE facilities.

The results indicated that (1) hydraulic force's did,not contribute to shroud cracking, (2) vibration testing of the original design revealed that the CEA guide and tube frequencies are in the range of the RCS pumps blade passing frequency and in the frequency range of the upper guide structure tube sheet, and (3) excitation tests of the modified guide tube design showed that the CEA guide frequency was eliminated.

The staff raised questions about the observed stress corrosion cracking in the Unit 1 shroud assembly and pointed out that the shielded metal arc welding

process, which was used in the root pass for this component, would contribute to generating such cracks.

CE pointed out that the modified CEA shroud assembly for Unit 1 is a different component than the cracked assembly that was

removed, and that shielded metal are welding was not used for root passes in the new assembly.

Following installation of the modified CEA shroud assembly in Unit 1, the plant demonstration test will be used to check out its performance.

Demonstration Test The applicant plans to run a test at Palo Verde Unit 1 to demonstrate the adequacy of the component modifications to the reactor coolant

pumps, thermowelds and the CEA shroud assembly.

The test conditions will be representative of those used during the hot functional test and the system will be appropriately instrumented to check out,the structural and hydraulic performance.

The test is scheduled to start in June 1984.

Following completion of the test, the reactor vessel head will be removed and a reactor coolant pump will be disassembled to perform visual inspections.

After the inspections and the evaluation of the test results are complete, the applicant will submit final

f e

I

.ll C

I 1

reports for the reactor coolant

pumps, CEA shroud assemblies and thermowelds.

(A final report for the thermal sleeves was submitted in January 1984.)

The

., target date for submittal of the remaining reports is August 1984.

LPSI Pum s

The applicant and CE provided a history of the problems encountered with the LPSI pumps.

Initial problems were encountered in Unit 1 with Pump 1B between March and June 1983, during which time a series of intermittent non starts were experienced.

Replacing the motor with a Unit 3 LPSI pump motor did not solve the problem.

In July 1983, the lower wear ring was replaced and the pump operated satisfactorily during 10 starts.

In October 1983 LPSI Pump 2A in Unit 2 failed to start.

This event reopened the applicant's evaluation of the LPSI pump design for all units.

The cause of the failure was attributed to contact of the impeller and wear ring on start.

A number of possible causes for the unacceptable contact were considered and several investigations were made (included in LPSI viewgraphs 4 and 5).

As a result of the above evaluations, several modifications were made to the LPSI pump design (viewgraph 6) and the modified pump was tested in air and water.

The tests showed that the modifications resulted in improved pump performance (starting) but the pump did fail to start once during a water test.

At that point, additional testing was conducted by using the motor from the containment spray pump in lieu of the original LPSI motor.

The containment spray pump design is very similar to the LPSI pump but has a larger motor with a stiffer shaft.

For this series of testing, the LPSI pump started

.100 consecutive times without failure.

Visual examination after testing revealed little to no contact between the impeller and the lower wear ring.

e The applicant stated that it is still evaluating the LPSI pump problems and has

- not yet made any final conclusions on what modifications will be made to resolve this issue.

Qr>glnal signod hp E. k Licitra

Enclosures:

1.

Meeting Attendees 2.

Viewgraphs DL:LB83 EALicit /y 4/+84 ighton

/84 E. A. Licitra, Project Manager Licensing Branch No.

3 Division of Licensing

4 0 h

Pal o Verde Mr. E.

F..

Van Brunt, Jr.

Vice President - Nuclear Proiects Arizona Public Service Company P. 0.

Box 21666 Phoenix, Arizona 85036 0

Arthur C. Gehr, Esq.

Snell

& Wilmer 3100 Valley Center

Phoenix, Arizona 85073 Mr. James M. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington

Phoenix, Arizona 85007 Charles R. Kocher, Esq. Assistant Counsel James A. Boeletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Ms. Margaret Walker Deputy Director of Energy Programs Economic Planning and Development Office 1700 West Washington Phoenix, Arizona 85007 Mr. Rand L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Resident Inspector Palo Verde/NPS U.S. Nuclear Regulatory Commission P. 0.

Box 21324 Phoenix, Arizona 85001 Ms. Patricia Lee Hourihan 6413 S. 26th Street Phoenix, Arizona 85040 Regional Administrator - Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Kenneth Berlin, Esq.

Winston

& Strawn Suite 500 2550 M Street, NW Washington, DC 20037 Ms. Lynne Bernabei Government Accountability Project of the Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 Ms. Jill Morrison 522 E. Colgate Tempi, Arizona 85238

Meetin Attendees NRC M. Licitra B. Bosnak G. Knighton L. Dewey S.

Hou J. Jackson K. Eccleston J. Halapatz W. S. Hazelton G. Bagchi B. D. Liaw ERCO E.

Makay ACRS L. Wainer GAP L. Bernabei APS J.

D. Hayes E.

E.

Yan Brunt, Jr.

B. Quinn A. Gehr C. Ferguson R.

Ivan J.

F. Gibbons D. R.

Wade F.

P. Colou R.

P.

Adams C. B. Brinkman T. J. Collier G. A. Davis T.

K. Samuels J.

R.

Rec Bechtel W. Bingham GRS W. German

)

E. Dluzniewski Arizona Dail Star J. Ellement KSB W. Germany)

R. Dernedde

A6EflDA APS YiEETIN6 IIITH THE NRC STAFF (TESTING OF C-E COMPONENTS)

I NRC OPENING RE[1ARKS NRC STAFF II INTRODUCTION E,

E.

VAN BRUNT 0

HOT FUNCTIONAL TESTING CONCERNS (HFT)

~

LOW PRESSURE SAFETY INJECTION PUMPS (LPSI)

III HFT 0

SUMMARY

OF TESTING PROGRAM C-E TEST PROGRAM STATUS THERMAL SLEEVES THERMOWELLS REACTOR COOLANT PUMP CONTROL ELEMENT ASSEMBLY SHROUD Cs FERGUSON 0

PVNGS DEMONSTRATION TEST OBJECTIVES TEST PROGRAM POST TEST PROGRAM

~

HFT CONCERN CONCLUSIONS Ci HAYES Es Es VAN BRUNT IV LPSI PUNP 0

INTRODUCTION Es Es VAN BRUNT 0

SUMMARY

OF CONCERNS HISTORY EVALUATION Cs FERGUSON EEVH 5/20/80

'C '

(

4 PVNGS DENONSTRATION TEST C-E TEST PROGRAN 3/20/84 1.

CF

ES e

C-E TEST OBJECTIVES THERMAL SLEEVES A

tIO TESTING'EQUI RED THERMOWELLS As VERIFY HIGHER NATURAL FREQUENCY WITH MODIFIED DESIGN Bs VERIFY REDUCED VORTEX SHEDDING WITH MODIFIED DESIGN RC PUMP A

VERIFY ADEQUACY OF BOLTING IMPROVEMENTS Bs VERIFY ADEQUACY OF IMPELLER IMPROVEMENTS Cs VERIFY REDUCED CAVITATION TENDENCY Ds VERIFY REDUCED PRESSURE PULSATIONS AT PUMP DISCHARGE Es VERIFY REDUCED INTERNAL STRESSES CEA SHROUD A

VERIFY ELIMINATION OF EXCITABLE FREQUENCY Bs VERIFY STRESS ANALYSIS Cs VERIFY VIBRATIONAL MODES USED IN ANALYSIS 3/20/80 CF 1A

e TESTING MAS CONDUCTED ON THE FOLLOMING COPiPONENTS TO VERIFY THE ADEQUACY OF THE DESIGN MODIFICATIONS THERNOMELLS RC PUNP CEA SHROUD

~

THE SAFETY INJECTION AND SURGE LINE THERNAL SLEEVES MERE REMOVED CONSEQUENTLY, NO THERMAL HYDRAULIC TESTS MERE Com!DUCTED

~ THE C-E TESTING HAS BEEN DESCRIBED IN PAST PRESENTATIO!!S TO THE NRC AND TO THE ACRS IN DECENBER 1983

~ PRELININARY RESULTS MERE PROVIDED BY APS IN THE INTERIN REPORTS 5/20/84 2,

cF

THERNL SLEEVES TEST PROGRAM

~ TESTING WAS LIMITED TO DEMONSTRATION OF EXTRACTION AND EXPLANS ION JOINT AfQCHINING TOOLS AND FIXTURES

~ METALLURGICAL EXAMINATIONS WERE CONDUCTED TO DETERMINE IF THE MATERIALS HAD CONTRIBUTED TO THE FAILURE, WHICH THEY DID I'lOT 3/20/84 2A CF

STRA THERMAL SLEEVES OBJECTIVES i VERIFY THAT SLEEVE DID NOT ROTATE OR MOVE OUT OF POSITION-DEMONSTRATION TEST ACTIVITI ES

~ EXAMINATION OF THE CHARGING LINE SLEEVE TO ASSURE PROPER INSTALLATION 3/20/84 2Bo CF

RTD THERNOHELLS TEST PROGRAN o

YORTEX SHEDDING TESTS

~

FLOM TESTS UP TO 100 FT/SEC IN LOOP TEST AND SIMULATED OPERATING CONDITIONS IN THF FULL SCALE RC PUMP TEST LOOP

~ STRUCTURAL RESPONSE AND TOTAL SYSTEM YIBRATION TESTS e

DENONSTRATION OF PIPE NOZZLE RENOYAL AND INSTALLATION TOOLING AND FIXTURES 3/20/84 3,

CF

RTD THERNOWELLS SUMNARY OF TESTS e

NATURAL FREqUENCY OF.:"IODIFIED THERNOWELL TIP IS '2400 Hz e

VORTEX SHEDDING FREAUENCY 700-800 Hz AT THE 7O TO 80 FT/SEC FLOW RANGE

~ THERNOWELL/NOZZLE STRUCTURE ABSORBED VORTEX SHEDDING LOADS WITHOUT CAUSING OVERSTRESS OR FATIGUE

~

NO WEAR OCCURRED 3/20/84 CF

RTD THERMO~IELLS

~

OBJECTIVES

-VERIFY THAT THE NEASURED FREQUEi'ACIES AND AMPLITUDES OF THE IMMERSED TIP ARE CONiPARABLE TO THOSE OBSERVED DURING THE C-E TEST PROGRAM

-MEASURE RTD/Tid HEAD AND LOOP VIBRATIONS TO DENOl"STRATE ADEQUACY OF VALUE USED Ii'3 TllE STRESS ANALYSIS DENOHSTRATION TEST IilSTRUNEHTATIOfl

~

INTERNAL AND EXTERNAL BIAXIALACCELERONETERS HILL BE INSTALLED TO NEASURE THERMO tELL TIP, HEAD Af'kD RC PIPING VIBRATIOiV 3/20/84 5,

CF

i

RC PUMP TEST PROGRAM

~

MODEL TEST AT KSB IMPACT OF INCREASING IMPELLER-OIFFUSER VANE GAP ON HYDRAULICS AND CAVITATION AT RUNOUT CONDITIONS CHANGES IN PRESSURE PULSATIONS RESULTING FROM INCREASING THE GAP INFLUENCE OF BACKFILING OF IMPELLER TO REGAIN HEAD VERIFICATION OF STRESS LOADING ON IMPELLER VANES VERIFICATION OF LOADINGS ON DIFFUSER VANES ESTABLISH METHOD FOR CUTTING BACK THE DIFFUSER VANES TO INCREASE GAP AND FOR BACKFILING IMPELLER VANES 3/20/84 6,

CF

RC PUNP

'SUNNARY OF KSB TESTS i STRESS LEVELS ON INPELLER Ai<D DIFFUSER VAtJES

'~(ERE OF ACCEPTABLE LEVELS e

I"JCREASIfJG GAP HAD NIf'JOR If"PACT 0"'YDRAULIC PERFORNAHCE Al'JD REDUCED CAVITATION POTEf'JTI AL e

HEAD LOSSES DUE TO GAP

INCREASE, RENOVAL OF SUCTIOi'J PIPE RIHJGS CAtJ BE RECOVERED BY BACKFILItJG THE INPELLER

~

PRESSURE PULSATIONS MERE REDUCED BY IfJCREASIidG THE GAP o GUIDELINES FOR CUTTING BACK THE DIFFUSER VAtJES, BACKFILIf'JG OF INPELLER VAfJES AND BOLTING NODIFICATIOfJ L'tERE DEVELOPED 3/20/84 7

CF

K P~

S 0

P P

S C-RUN BASELINE TEST OF ORIGINAL DES IGN AT DESIGN AND RUNOUT CONDITIONS INCORPORATE MODI FI CATIONS AND RUN TESTS TO COMPARE WITH ORIGINAL DESIGN

- DETERMINE HYDRAULIC PERFORMANCE 5/20/84 CF

RC PLUMP e

TEST PROGRAM AT CE-NENINGTON TEST.

T I HE 1,

PHASE 1

A, 95 TO 130%

FLOW DATA Bs BASE LINE DATA FOR INSTRUMENTATION NO MODIFICATIONS GAP 2s3 PERCENT 50 HOURS 2.

PHASE 2 A, 130 TO 150%

FLOW DATA Bs CONTINUATION OF BASELINF DATA, NO MODIFICATION)NS GAP 2,3 PERCENT C

DISASSEMBLY AND INSPECTION 100 HOURS 3.

PHASE 3 As 130 TO 150%

FLOW DATA Bs ALL MODIFICATIONS INCORPORATED, GAP 6s0 PERCENTs 150 HOURS PHASE 0 As 95 TO 1307i FLOW DATA B,

ALL MODIFICATIONS INCORPORATEDs GAP 6 0

PERCENT, C

DISASSEMBLY AND INSPECTION 50 HOURS 5,

PHASE 5

A 95 TO 130%

FLOW DATA Bs ALL MODIFICATIONS CD ADDITIONAL BACKFILING OF IMPELLER 20 HOURS 3/2%I/84 CF

RC PUNP SUNDRY OF CE-N TESTS (PHASE 5, 4

AND 5) o THE NODIFIED DESIGN OF THE DIFFUSER AND SUCTION PIPE BOLTING CONFIGURATION WAS SUCCESSFULLY DFNONSTRATFD o

HYDRAULIC PERFORNNCE

'wET DESIGN REQUIRE."tENTS e DIFFUSER BOLT STRAINS WERE REDUCED SIGNIFICANTLY o VERTICAL ANn HORIZONTAL ACCELERATIONS OF DIFF!!SER HALVES WERE S IGNIFICANTLY REDUCED e

THERE HAS NO EVIDENCE OF CAVITATION ON DIFFUSER O~

I,"t ELLER e

NDE EXAMINATION OF INPELLER SHOWED NO If'1DICATIONS OF ANY DEFECTS AS A RESULT OF TESTS 3/20/84 9.

NS RATI RC PUMP OBJECTIVE o VERIFY RESULTS OF THE RC PUMP MODIFICATIONS AS DE~0'.lSTRATED IN THE CE-N FULL SCALE PUMP TESTS

~ VERIFY THE RCS FOUR PUMP OPERATION FLOW RATE (486,900 GPM-525,000 GPM)

DEMONSTRATION TEST INSTRUMENTATION

~

NORMAL RC PUMP INSTRUMENTATION TO MEASURE OPERATING: ARA."1 TERS

'WHICH INCLUDES SHAFT ORBIT MONITORING o TRIAXIALACCELEROMETERS ON THRUST HOUSING FRAME TO MEASURE PUMP VIBRATION

~

PRESSURE TRANSDUCER ON SUCTION PRESSURE LINE TO t':FISSURE

~lPSH o

PRESSURE TRANSDUCERS (COLD LEGS 1A a 2A)

INSTALLED IN RT)

THERMO!HELL LOCATIONS ON DISCHARGE TO MEASURE P;ESSURE PULSATIONS o ULTRASOillC FLOll MEASUREMENT (UFM)

INSTRUMENTATION1 Sr20<SC 10, CF

CEA SHROUD 3/20/84

CFll,

CEA SHRnun C-E TEST PROGRAN

~

HYBRAULIC TFSTS

~ AXIAL FLON UP THROU"H CEA TUBES, e

LATERAL FLOW PAST 80TTO< OF CFA TURF ACROSS SI!PPORT PLATF.

e NECHANICAL TFSTS

~ VIBRATION TFSTS e SINGLE TUBF.

e CFA SHROUO ASSE%LY

~ EXCITATION TESTS-SIN(iLE TUBE

~

OR I (i INAL OES IGN

~

NODIF IEO OFS I GN 5/20/8~!

CF j2,

CEA SHROUD SUMP"ARY OF C-i TESTS

~ HYDRAULIC TESTS DI'3 NOT IDF.."ITIFY DIRFCT H~t3RAl)l IC FnRCES nN SHROUD OF A PWGNITUDE THAT COULD RESt)LT IN 0 SI")IFICANT CO".JTRIBUT?Ot!

TO Sf)Rnl!.'j C~ACKI'A~,

e CEA GUIDE AND TUBE FREqUENCIES ARE IN THE RANGF.

OF THE RC Pl) )P BLADE PASSI.")G FRE~UE!~)CY A)'4'TS FIRST

HARMONIC, o

CEA GUIDES A:")13 Tl)BES l'!ERE ALSO P)

THE FREQUENCY

~ANhE OF THE UPPER GUIDE STRUCTURF.

TUBE SHEET.

~ VIBRATION TFSTS OF THE CEA SHROUD ASSE%LY It3FNTIFIF3 FREqUENCIES BELOH THAT OF THE CEA 6UIDES A.")13 TUBES, e

EXCITATION TESTS PROVI13ED AN ESTIMATE OF THE STRESS CnNCENTRATION FACTOR OF THE CFA r UI13E NFLnE3 Cnl)FIhl)RATIn~),

e FXCITATION TEST AF NODIFIFD SINhLF hUIDF. T)lBE SHOWFD

THF, CFA hlJIt3E FRFQUE,"ICY TO BF FLIPlINATEt3.

3/20/89 CF tl

0 !STR ION CEA SHROUD OBJECTIVES e VERIFY HYDRAULIC LO4DINh ON THF. I!PPFR tiUInF. STRUCTURE(ITS),

~ VFRIFY STRUCTIJRAL I ITERRITY OF CEA

SHROUD, e

CONFIRN ACCEPTABILITY OF UGS PERFORNANCE HITH MODIFIED CEA SHROUD ASSE%LY, DE!"OHSTRATION TEST INSTRUNENTATION

~

CEA SHROIJO IS IflSTRU."!ENTED LJITH STRAIN HARES, PRFSSIJRE TRA".ISDUCERS AND ACCELERO<ETERS, e

THFY ARF. LOCATED BOTH AT TOP AND BOTTOM OF SHROIJD(SLIDES 14 j4$',B) e VIBRATORY NOTION HILL BE DETERMII'!E9 USINh RI-QIRFCTIONAL ACCELEROJ'DIETERS, e STRAIN 4AhES MILL PROVIDE STRESS LEVFLS Ill SELFCTVI TI!BES A% E'(EBS, e

DYN4NIC STRAIN RILL BF. CORRELATFJl NITS DYNAMIC PRESS!!RE AT THF.

TOP,AND BOTTOM OF THF, SA..E TIBER, 5/20/84 CF 14.

PROBLENS AND TEST OBJECTIVES o

HFT PROBLENS THERMAL SLEEVES RTD THERMOWELLS RC PUMPS CEA SHROUD e

CONPONEHT TEST OBJECTIVES THERMAL SLEEVES A

VERIFY THE ADEQUACY OF INSTALLATION PROCESS B

VERIFY NO SLEEVE ROTATION OR MOVEMENT THERMOWELLS Ai VERIFY THAT fORCES AND FREQUENCIES

'ARE COMPARABLE TO EARLIER TESTING Bc VERIFY ADEQUACY OF STRESS ANALYSIS RC PUMP As VERIFY ADEQUACY OF PUMP MODIFICATIONS CEA SHROUD A

VERIFY HYDRAULIC LOADING Bi VERIFY STRUCTURAL INTEGRITY OF MODIFIED SHROUD Cc VERIFY OVERALL UPPER GUIDE STRUCTURE PERFORMANCE o

SYSTEN TEST OBJECTIVES DEMONSTRATE ADEQUACY OF COMPONENT MODIFICATIONS IN SYSTEM APPLICATION VERIFY REDUCTION IN PRESSURE PULSATIONS VERIFY ADEQUACY OF TOTAL SYSTEM FLOWRATE VERIFY MINIMAL COMPONENT INTERACTIONS DUE TO MODIFICATIONS 3/23/84 1J O'C

'I

DEttONSTRATI0)l TEST TEST PROGRAN DESCRIPTION OBJECTIVES

Suzr1ARY OF TESTS TO BE CONDUCTED INITIALTEST CONDITIONS TEST TENPERATURE/PRESSURE PLATEAUS POST DENOHSTRATION TEST INSPECTIONS JDH 3/20/8<)-

TEST PROGRAN DESCRIPTIOH C-E ESTABLISHED CRITERIA DENONSTRATION TEST TO VERIFY NODIFICATIOHS JDH 3/20/8A OBJECTIVES VERIFY UGS NODIFICATION VERIFY RCP'S NOD IFI CATIONS VERIFY RTD REDESIGN NEASURE RCS FLOW PATES RECORD BASELINE DATA JDH 3/20/84

.3-

SUNNARY OF TESTS TO BE CONDUCTED REACTOR COOLANT SYSTEN TEST PROCEDURE UGS NODIFICATION VERIFICATION RCS PUNP DATA, OPERATING AND CONTINUOUS t10NITORING

- PRE-CORE RCS FLOL'( RATE

0 J

INITIALTEST CONDITIONS PRE-CORE f]OT PUNP TEST CONTROLLING DOCUNENT ESTABLISHES PLANT CONDITIONS JDH 3/20/84

TEST TEMPERATURE/PRESSURE PLATEAUS CE ESTABLISHED CRITERIA VARIOUS PUMP COMBIHATIOHS AT SPECIFIED TEMPERATURE/

PRESSURE PLATEAUS'OUR

PUMP, NOP, NOT, 200 HOUR, STEADY-STATE RUN JDH 3/20/84

Ih L

POST DENONSTRATION TEST INSPECTIONS RENOVE REACTOR VESSEL HEAD VISUAL IHSPECTIOf'l DISASSENBLE AND INSPECT ONE RCP JDH 5/20/84

LPSI PN'1PS 3/20/84 l.

CF

I l

LOW PRESSURF SAFEl Y INJECl ION PUIIIIP RADlAL BEARlNG

~

~

~

~

~

~

~

~

THRUST BEARING WEAR RINGS

.M.JJ 3/20/84 CF 2,

HISTORY OF FAILURES TO START MARCH 18, 1983'B OPERATED THREE MINUTES WITH SUCTION YALYE CLOSED.

THE PUMP 'tlAS SECURED AND RESTART FAILED.

THE PUMP

<<IAS DISASSEMBLED AND INS, ECTED, DURING NY AND JUNE THERE WAS A SERIES OF INTERMITTENT NON STARTS.

IN JUNE, THE MOTOR HAS REPLACED HITH A UNIT 3 LPSI ROTOR AND SUBSEQUENTLY A FAILURE TO START OCCURRED, IN MID JULY, THE LONER HEAR RING HAS REPLACED AND SINCE THEN 1B HAS OPERATED SATISFACTORILY.

(10 STARTS)

EARLY OCTOBER 1983 FAILURE TO START OF LPSI 2A, THIS MARKED THE OUTSET OF THE PRESENT

PROGRAM, 3/20/84 CF'3.

LPSI PUMP ANALYSIS OF CAUSE OF FAILURE T!) START 1,

CONTACT OF IMPELLER AND !i(EAR RING ON START 2,

POSSIBLE CAUSES OF UNACCEPTABLE CONTACT

~

INSUFFICIENT IMPELLER TO NEAR RIN" CLEARANCE o

IMPELLER AND NEAR RING MATERIAL INCOMPATIBILITY

~ EXCESSIVE LOOSENESS IN MOTOR BEARINGS

~

MOTOR ROTOR OFFSET o EXCESSIVE TOLERANCE BUILDUP o

ROTATING ASSEMBLY DYNAMICS

~

OTHER 5/20/8Q CF

LPSI PUMP INVESTIGATIONS

~ DISASSEMBLED PUMP AND INSPECTED IMPELLER AND HEAR RINGS e

MEASURED CLEARANCES BETWEEN IMPELLER AND HEAR RING

~

MEASURED CONCENTRICITY OF MOTOR TO PUMP AND PUMP TO CASING INSTALLATION TO DETERMINE EXTENT OF ECCENTRICITY e

MEASURED RELATIVE DISPLACEMENTS OF SHAFT AND BEARINGS BOTH RADIALLY AND VERTICALLY e

MEAS<!RED AIR GAP BETWEEN MOTOR ROTOR AND STATOR e

DEVELOPING ROTOR DYNAMIC MODELS TO ASSIST IN EVALUATION OF STRUCTURAL DEFORMATION AND DYNAMIC RESONANCES 5/20/8A CF 5.

LPSI PUMP MODIFICATIONS IMPLEMENTED PRIOR TO NOVEMBER TESTING 1,

CHANGE CASING RING FROM K-MONEL TO NITRONICS 60 e

REDUCED GALLING TENDENCY

~

GOOD CORROS ION RESISTANCE

~

REDUCED COEFFICIENT OF FRICTION o

NOT SUBJECT TO WORK HARDEl'lIf'lG 2,

INCREASE IMPELLER TO CASING RING CLEAPANCE e NOMINAL,006 INCH DIAMETRAL INCREASE e

REDUCE POTENTIAL FOR RING CONTACT

~

REDUCED HYDRAULIC PERFORMANCE 3,

SERRATING IMPELLER o

REGAIN PORTION OF PUMP PERFORPLOf ICE LOSS DUE TO INCREASED GAP 4.

MOTOR DOWELING AND IMPROVED TOLERANCING o

REDUCED TOLERANCE FROM.005 TO.002 INCHES

~

IMPROVE CONCENTRICITY OF MOTOR TO SUPPORT HEAD

~

IMPROVE CONCENTRICITY OF IMPELLER AflD CASING RING 5,

MOTOR LOWER BEARING REPLACEMENT (LPSI MOTOR ONLY) e PRELOAD TO REDUCE BEARING INTERNAL CLEARANCE o

REDUCES IMPELLER RADIAL MOTION UNDER LOAD 3/20/84 CF 6.

LPSI PUPIP TEST PROGRAN AND STATUS

~ LPSI PUMP NOTOR AIR TESTS RADIAL DEFLECTIONS MERE NEASURED AT LOCATIONS SHOWN ON SLIDE 8

~ MITHOU PSI INP

- ORIGINAL LOWER BEARING PRELOADED LOWER BEARING

~ WITH LPSI INPELLER ORIGINAL LONER BEARING PRELOADED LOWER BEARING

~ LPSI PUNP NOTOR WATER TEST

- NEASURE RADIAL DEFLECTIONS AT POSITION 1 SHOWN ON SLIDE 8 o FIVE START MET TEST FAILED TO START AT FIFTH START POSITION PUMP DID START IN EACH OF FIVE SUBSEQUENT STARTS 3/20/80 CF 7,

3/20/84 CF 8,

'I

LPSI PUMP TEST PROGRAM AND STATUS CONTINUED o

CS PUMP MOTOR AIR TESTS RADIAL DEFLECTIOf'lS MEASURED IN SAME MANNER AS LPSI TESTS (SLIDE 8) o WITHOUT IMPELLER ORIGINAL BEARING e

WITH IMPELLER ORIGINAL BEARING o

CS PUMP MOTOR WATER TESTS MEASURED DEFLECTIONS AT POSITION 1 (SLIDE 8)

~ FIVE START TEST NO FAILURE TO START DISASSEMBLED FOR INSPECTION o

NO CONTACT ON UPPER WEAR RING OR IN, ELLER e

VERY SLIGHT TO NO CONTACT Ol'l LOWER HEAR RING e 100 START TESTS NO FAILURE TO START t)ISASSEMBLED FOR INSPECTION e LITTLE TO NO ADDITIONAL CONTACT 3/20/84 CF 9.

MEETING

SUMMARY

DISTRIBUTION

<Docket:No(.s.).:

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NRC PDR Local PDR NSIC PRC System LB3 Reading

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Applicant 5 Service List

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