ML20237C606

Summary of 871202 Meeting W/Util & Bechtel Re Causes & Mods Relative to Pipe Failures in Auxiliary Feedwater Sys at Plant.List of Meeting Attendees & Util Handouts Encl

ML20237C606
Person / Time
Site:	South Texas
Issue date:	12/14/1987
From:	Kadambi N Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8712220022
Download: ML20237C606 (62)

Text

- __ _ - _ - _ _ -

December 14, 1987 s

Docket No. 50-498 APPLICANT: Houston Lighting and Power Company FACILITY: South Texas Project, Unit 1

SUMMARY

OF MEETING TO DISCUSS CAUSES AND MODIFICATIONS RELATIVE TO PIPE FAILURES IN THE AUXILIARY FEEDWATER SYSTEM AT SOUTH TEXAS PROJECT, UNIT 1, ON DECEMBER 2, 1987 The meeting attendees are shown in Enclosure 1. The. licensee provided handouts which are included herewith as Enclosure 2.

Discussion:

During startup of the South Texas Project, Unit 1, piping (vent, drain or instrument lines) and pipe supports associated with the auxiliary feedwater system experienced failure on at least three occasions. The licensee undertook extensive testing to determine the causes for the vibratory forces which led to the failures. The presentation provided details on the results of the tests and post-failure examinations, and also included proposed preventative actions.

Subsequent to the presentation, the licensee was informed that the staff could not conclude that sufficient testing had been done or that the root causes had been adequately addressed. The licensee indicated that further testing would be performed to support a root cause determination.

N. Prasad Kadambi, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosures:

See next page D IBUTION DocketFile NRC PDR Local PDR PD4 Reading J. Calvo P. Kadambi OGC-Bethesda E. Jordan J. Partlow W. L. Jensen E. Hildebrand G. L. Constable D. Katze 0. Rothberg T. O. Martin A. Serkiz F. Cherny J. Page A. Lee G. Hammer P. T. Kuo L. Marsh N. Wagner ACRS (10)

PD4/P PD4/D NPKadambi:sr JCalvo 12/q/87 12////87 8712220022 871214 PDR ADOCK 05000498 A PDR

s Mr. J. H. Goldberg Houston Lighting and Power Company South Texas Project cc:

Brian Berwick, Esq. Resident Inspector / South Texas Assistant Attorney General Project Environmental Protection Division c/o U.S. Nuclear Regulatory Commission P. O. Box 12548 P. O. Box 910 Capitol Station Bay City, Texas 77414 Austin, Texas 78711 l

Mr. Jonathan Davis Mr. J. T. Westermeir Assistant City Attorney Manager, South Texas Project City of Austin Houston Lighting and Power Company P. O. Box 1088 P. O. Box 1700 Austin, Texas 78767 Houston, Texas 77001 Mr. M. B. Lee Ms. Pat Coy Mr. J. E. Malaski Citizens Concerned About Nuclear City of Austin Power P. O. Box 1088 5106 Casa Oro Austin, Texas 78767-8814 San Antonio, Texas 78233 Mr. Mark R. Wisenberg Mr. A. von Rosenberg Manager, Nuclear Licensing Mr. M. T. Hardt Houston Lighting and Power Company City Public Service Board P. O. Box 1700 P. O. Box 1771 Houston, Texas 77001 San Antonio, Texas 78296 Mr. A. Zaccaria Jack R. Newman, Esq. Mr. K. G. Hess Newman & Holtzinger, P.C. Bechtel Corporation 1615 L Street, NW P. O. Box 2166 Washington, D.C. 20036 Houston, Texas 77001 Melbert Schwartz, Jr., Esq. Mr. T. V. Shockley Baker & Botts Mr. R. L. Range One Shell Plaza Central Power and Light Company Houston, Texas 77002 P. O. Box 2121 Corpus Christi, Texas 78403 Mrs. Peggy Buchorn Executive Director Citizens for Equitable Utilities, Inc.

Route 1, Box 1684 Brazoria, Texas 77422

[

4 Houston Lighting & Power Company South Texas Project l

l cc:  ;

l Regional Administrator, Region IV i U.S. Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive, Suite 1000 i Arlington, Texas 76011 Mr. Lanny Sinkin, l

Counsel for Intervenor Citizens Concerned about Nuclear Power, Inc.

Christic Institute 1324 North Capitol Street Washington, D.C. 20002 Licensing Representative Houston Lighting and Power Company Suite 610 Three Metro Center Bethesda, Maryland 20814 i

l L--__--_-___-_ _ _ ___ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ -

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Mr. J. H. Goldberg Houston Lighting and Power Company South Texas Project (other) ,

1 cc:

Mr. Paul Gosselink Attorney General's Office Post Office Box 12548, Capitol Station Austin, Texas 78711 Bureau of Radiation Control State of Texas 1101 West 49th Street Austin, Texas 78756 Office of the Governor ATTN: Ms. Darla Parker Office of Intergovernmental Relations Post Office Box 13561 Austin, Texas 78711  !

Judge, Matagorda County Matagorda County Courthouse 1700 Seventh Street Bay City, Texas 77414 Director, Eastern Environmental Radiation Facility (SER, SSER, DES & FES)

U.S. Environmental Protection Agency Post Office Box 3009 Montgomery, Alabama 36193 Director, Criteria and Standards (SER, SSER, DES, FES)

(ANR-460)

Office of Radiation Programs U.S. Environmental Protection Agency Washington, D.C. 20460 ,

1 Director, Office of Radiation Programs (DES & FES) was Vegas Facility U.S. Environmental Protection Agency l Post Office Box 18416 i' Las Vegas, Nevada 89114 EIS Review Coordinator EPA Regional VI Office 1201 Elm Street Dallas, Texas 75270 l

I t _ _ _ _ _ _ _ _ _ _ _________o

6 l

Enclosure 1 SOUTH TEXAS PROJECT MEETING DECEMBER 2, 1987 AUXILIARY FEEDWATER SYSTEM Name Affiliation N. P. Kadambi NRR/DRSP/PD-IV W. L. Jensen NRR/D0AR/EAB E. Hildebrand NRC/STP/RES G. L. Constable- NRC/DRP/RIV John J. Cassidy Bechtel Goud Memula Bechtel John Roberts Bechtel Don Katze NRR/ DEST /SRXB Owen Rothberg NRC/RES/EIB T. O. Martin NRC/EDO Al Serkiz RES/DRPS/RSIB Frank Cherny RES/DE/EIB Joel Page EIB/DE/RES Arnold Lee NRR/ DEST /EMEB Gary Hammer NRR/ DEST /EMEB David McCallum Houston Lighting & Power Bruce D. Moreton Bechtel/Ener. Mgr.

P. T. Kuo NRR/ DEST /EMEB L. B. Marsh NRR/ DEST /EMEB J. Calvo NRR/DRSP/PD-IV Norman Wagner NRR/ DEST /SPLB Chet McIntyre Houston Lighting & Power b

ENCLOSURE 2

. 12/01/57

'. AUXILIARY FEEDWATER AGENDA

1. CHRONOLOGY OF EVENTS AhD OVERVIEW

2. REVIEW OF SYSTEM CONFIGURATION AND OPERATI0h AND LICEhSING BASIS

3. CVERVIEW CF TESTING DURING STARTUP/ NORMAL CPERATION

' . LATER HAMMER SCEhERIO #1-(AIR ENTRAPMENT)

A) PHYSICAL DAMAGE TO PIPIhG SYSTEM F'FIhG CChFIGURATI0h

\ENT FAILURES AhCHOR FAILURE h E REPORTS B) METALLURGICAL EXAMINATICh RESULTS c) STEPS TAKEN TO PREVENT WATER HAMMER FEVIEW OF VEhlIhG PROCEDURE DESIGN / PROCEDURE CHANGES F?OOF TEST PROCEDURE P:PIhG/ PIPE SUPPCRi INSPECTICh PLAh E. ETEA:i S~;~E \IERATICL TESTIh5 A'.: E\1'UAT::N _

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6. LATERhAMMER SCEhARIO # 2-(MLLTIFEED)

A) Phtb1 CAL DAMAGE TO PlPING Si5 TEM

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a a B) WATERnAMMER TESTING AhD EVALLATIOh TESTING PLAN TEST RESULTS l

MODE 4 PROOF TESTS

7. CONCLUSIONS AhD PREVENTATIVE ACTIONS 8031C/0003I i

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e 12/01/E7

, CHRONOLOGY f

11/05/E7 .AF01EE TRAIN A PUMP OISCHARGE VENT FA: LED 11/08/E7 AF0018 TRAIN O FLOW ELEMENT ROOT VALVE FAILED

, i 11/09/E7 DEVELOPMENT OF TEST PROGRAM TO INVESTIGATE ROOT CAUSE OF FAILURES

! 11/13 / E7 IEMPORARY TEST ilEP07-AF-0001 REV O ISSUED TO TEST FOR ROOT CAUSE OF FAILURES ii/14/E7

• V!BRATION TEST BEGUN CRACKED ANCHOR (AF-1013-HL5002) FouND DOWNSTREAM OF TRAIN A X CONN VALVE.

NCR WRITTEN AND TEMPORARY SUPPORT (CHAIN FALL)

INSTALLED NEAR CRACKED AhCHOR. 3YSTEM IhSPECTED FOR ADDITIONAL DAMAGE.

VIBRATION TEST CONTINUED 1; if E7

• LATERFAPPEF ~CCC.::ED WLEh C:EN: L: :::5!":E \ALVESFECM IFA;N A i; F. A I .', ; - (t,N: EF N: .,. : : ', . : : : >,5 )

1;ilt.E7 FIAISbEL ';ERAi;.7, . IEsilh5 1,;/17!E7 REVIEWED VENTING PROCEDURE AND RECOMMENDED CHANGES l ', f ' ..E: AEt: :- \EN-'

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T: A)E*:TTEcs, 11/19/87 OUANTIFIED AIR TRAPPED IN SYSTEM DUE TO .ACK OF VENT VALVES ON IRAINS A. C AND D. CROSSTIES. EXPERIENCED WATERHAMMER WHILE RUNNING TRAIN A PUMP 11 WHEN TRAIN A AND D X CONN CROSSTIE VALVES OPENED.(UNDER N0 FLOW CONDITIONS)'

11/20/87 MODIFIED VENTING PROCEDURE TO "SkEEP" CROSSTIES.

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12/01/E7 11 21/ E7 COMPLETED CROSSTIE VALVE WATERHAMME: TEST SUCCESSFULLY DEMONSTRATING THAT A WATER SOLID SYSTEM WOULD NOT HAMMER DUE TO X C0hh VALVE OPENIhG UNDER- NO FLOW CONDITIONS 11/22/67 EXPERIENCED SUSTAINED WATERHAMMERING WHICH RESULTED IN CRACKED DRAIN VALVE CONNECTION Oh CROSSTIE AT DRAIN VALVE AF0238 11/23/87 WALKED DOWN SYSTEM FOR ADDITIONAL DAMAGE AND PERFORMED ADE AT SELECTED LOCATIONS. IDENTIFIEC CRACK IN IRAIN A SUCTION DRAIN AND IN TRAIN A CROSSTIE LINE ANCHOR (AF-1013-HL5002) EMBEDMENT PLATE. FOL hD EROKEN PIN FROM STRUT ON IRAIN C CROSSTIE (AF-1047-HL5002).

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. PE RFORMED TE ST iTEP07-AF-0004 WHICH CETERMINED TRAINS A, B AND C SUCTION PIPING WAS PROPERLY VENTED.

PERFORMED TEST iTEP07-AF-0003 TO ESTAELISH IRAIN B PUMP ,

l CURVE AhD TEST INTERACTIONS BETWEEN PLMP.

AUT0RECIRCUL ATION COATROL VALVE, AND CROSSTIE VALVE.

EXPERIENCED SHCET DURATION WATERHAMME: WHEN CLOSING C IRAIN CROSSTIE VALVE WITH 650 GPM FLCa.

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PREVEf4T ATIVE ACTI0f,S

1. CROSSTIE VALVES LILL BE CLCSEC DURIhG MCDES 1. 2 AhD 1 CR ThE ASSCCIATED TFAIN LILL EE DECLAFED INCPERAELE.

2. PUMPS ShALL EE CPERATED AT A TCTAL STEAM GEhE5ATOR/ TEST LOOP STEADY STATE FLCL CF h 200 CPh TO AVCIC ThE FLAT PART CF ThE CHARACTERISTIC CURVE AND STAY LELL CUTSIDE TFE YARkAY VALVE CROSSOVER PCIhT.

1. A f, ADDITICNAL TEST WILL EE CChDUCTED Ih MCDE THREE SIMILAR TO THE FULL FLOW STEAM GEhERATOF FEED TEST THAT wAS RLN Ih MCOE 4.

lhIS LILL FURihER PROVE TEAT THE SYSTEM IS FLLLY CAPAELE OF RELIAELE CPERATICh AT HIGHER STE AM GE hE R ATCF F RE S S' ~.E S AND .

TEMPERATURES.

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At 0MATIC RECIRCULATION CONTROL VA L VE ( ARC VALVE )

. TEE ARC VALVE PROVIDED BY YARWAY CONSISTS OF A FLOW BAL ANCED SPRING LCLDED CHECK VALVE IN THE MAIN FLOW STRE AM AND A COMBINATION PISTON VA.VE AND CASC ADING PISTON TO REGUL ATE THE BYPASS FLOW FOR VARIOUS FLCW TRANSIENTS. WHEN THE FLOWRATE REQUIREMENTS OF THE SYSTEM EXCEED THE MINIMUM FLOW RATE FOR THE PUMP. THE EYPASS LINE VALVE CLOSES OFF ENTIRELY. IHE MAIN CHECK VALVE IS CONCURRENTLY PCSITIONED TO ALLOW FLOW AROUND THE DISC THROUGF THE MAIN VALVE OL LET. EACH VALVE HAS A 4" INLET AND OUTLET WITH A i 1/2

• BYP ASS L:NE. THE BYPASS IS SIZED TO PASS APPROXIMATELY 100 GPM. THE E t: ASS FLOW IS ROUTED B ACK TO ThE AUXILI ARY FEE:a7TER STORAGE TANK.

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Arx TO STEAM GENEPAT0n FLOW CONTROL VAL VE s FV-7E23. 24, 25. 26.

T-E FLOW CONTROL VALVES ARE 4" VALTEK GLOBE VALVES WITH LIMITO P: TOR OPERATORS WHICH REGULATE THE AMOUNT OF FLOL DELIVERED T STEAM GENERATORS.

THE OPERATOR CAN MANUALLY POSITION THE VALVE TO CETAIN THE REQUIRED FLOW TO THE STEAM GENERATOR. IN ADDITION TO TLIS MANUAL POSITIONING. E ACH VALVE IS INTERLOCKED WITH A FLOW TRANSMITTER LOCATED DOWNSTREAM OF THE VALVE. IN THE PRESENCE OF AN ESF SIGNAL (SAFETY INJECTION, 2/4 LO-LO LEVEL IN ANY STE AM GENERATOR OR AMSAC INITI ATE CONTROL ) WILL. THRU GDPS. OPEN THE VALVE TO PROVIDE APPROXIMATELY 600-625 GPM FLOW. AND MAINTAIN THIS FLOW L: THIN A 550 TO 675 GPM BAND AS LONG AS THE ESF SIGNAL IS PRESENT TrE VALVE LOGIC CONTAINS A RESET SWITCH WHICH ALLOWS THE OPE E* PASS THE ESF SIGNAL AND MANUALLY POSITION THE VALVE AS REQUIRE CETAIN NECESSARY FLOW TO THE STEAM GENERATOR.

A W TO STE Av GENEP ATOP STOP CHECK VALVES MC.-CO!9. 40. 65. 65.

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T-E CFERATOR. IN A:CITIch, THE VALVE IS A.TCPAT:CALLY CFENED BY A

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12/01/E7 f': TOR-DRIVEN AIW PUMPS C.ANTITY -

IHREE I'PE HORI ZONT AL . CE NTRIF UG A L M2 NUF ACTURER /P.0 DEL NUMBE R BINGHAM-WILLIAMETTE/MSC is.MBE R OF ST AGE S 11 F,

• T I N G (AS SPECIFIED)  ;

1. CAPACITY (EACH). GPM 6CO

2. IOTAL HEAD. FT 3260 j

3. f,PSH FECUIRED. FT 22 L. EFLVE FOPSEPOWEF (EFP) 663 E FAT:'3 1

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1. TyoE INeucTION POTep

2. MANUFACTURES WESTINGHOUSE

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12/01/E7 ARC VALVE EXPE;IENCE AT OTHER FL A',TS CA. VERT CLIFFS - INITI ALLY USED ONLY ON AUxILI ARY FEEDWATER l EMERGENCY STEAM DRIVEN PUMP IRAIN WHEN DESIGN FLOWS CHANGED FROM ORIGINAL DESIGN CRITERIA TO A LOWER VALUE THAN WHAT WAS SPECIFIED FOR THE ARC VALVE. A PROBLEM LAS ENCOUNTERED AT THE FLOW TRANSITION POINT AND FLOW INTERRUPTIONS WERE NOTED. .fiO WATERHAMMER WAS RECORDED.

PROBLEM WAS RESOLVED EY REMOVING INTERNALS OF THE ARC VALVE AhD INSTALLING ORIFICES FOR MINIFLOW TO PUMP.

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LSED IN AL'X: . I A F Y FEECWATER STS~EP

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ETEA" [F:VE'. DU" 3 4: E 70: G:* : APACITY J, . r..: Eh5 ::.;CvhTEF ' . . ;. . ;M Ai. A;iE; AF SYSTEM IS NOT USED TO FEEC STEAM GENERATORS AT LCW FLC'.S. TWEi USE: STAFit: T EED C LPF Oh INITIA.

51AETv Ah; -2kE h;' LSED Tri A; A' lcm FLCwS. U.

TWC CF T.-FEE :: 15!C',5 THEY EA'.E LEED THE Af SYETEP AT FULL FL0h WITH NO PROBLEMS h0TED TO DATE.

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H story Of Auxi!!a y Feedwater System Operation Page 1 L - System turnover from construction ,

i Prerequisite testing not involving integra'ed system ope ation; singuta- )

component operation venficatio'n -)

Preoperational testing AF P-01 and AF-P-02 (Motor and Turbine Driven Auxil:a y Feedwater Pump and Valve Testing). )1 These tests verified... i i Pump capacity i-l System response time from ESF signal to design flow to Steam Generator j System endurance on the minimum flow rei : rne (100 gpm) ,

System endurance on the test recire line (550 ;;m)

Ind vidual component response to ESF s!gna s Fice.ra:e t rough m*.P.r 1:,v re: rc ' ne l

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Vital Signs" of Terry Turbins (Bearing Temp, Co Temp, Vibra:. n)

AF-P-03 (Auxiliary Feedwater Water Hammer Test) i This test verified... )

No water hammer would result from an ESF initiated Auxiliary Feedwater System Start Test method Lowered Steam Generator level to 33%

Wed, Dec 2,1987 l

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ l

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- story Ji Auxi!.ay Feedwater System Operation Page 2 Isolated the Steam Generator to be tested i

, Checked piping ter perature Jumpered relays to get an ESF initiated Auxiliary Feedwater System start Start Auxiliary Feedwater Pump Open the containment isolation valve l Record data Increase level to approximately 80%

Stop Auxiliary Feedwater pump .

Record Auxiliary Feedwater System piping temperatures for four hours

- Hot Functional Test operations Auxiliary Feec. vater System was utikzed in conjunction w'th the Steam Generator PORV's to contrei RCS temperature j Typ,ca"y ' p.:mp feed.r; a' Steam Generatcrs in : ;n cr:s st e vaies at

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Gu e a': FORV's t: :^:' FCS te oera' e T,f:a:.y 1 pa~.; feed' ; 2' Stea~ Ge . erat: s P :.; : :31. : vaVe t at t q

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Startup Feedwater Pump to feed Steam Generators ]

- Between each of these milestones the Auxillary Feedwater System was )

i utilized... I To adjust Steam Generator levels To adjust Steam Generator chemistry To recirculate the Auxiliary Feedwater Storage Tank Wed, Dec 2,1987

- s:ory Of Aux'"aqi Feedwa:er System Operation Pa;9 3 Any cf t e above opsrations would be performed w,'th eE:n purrp serving i:s own Steam Generator, or crosstied to only one other l

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WATERHAMMER SCENARIO #1

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4 12/01/E7 STEPS TAKEh TO PREVEhT WATERHAMMER VENTING PROCEDURE REVIEWED FIVE HIGH POINT VENTS ADDED VENTING PROCEDURE MODIFIED PROOF TEST PERf0RMED TO OVANTIFY A;; ENTRAPPED EEFORE MODIFICATIONS VE NTED USIh3 C'. rFCCE: LRE

\EATED LI: N :- NEL FF;;ECURE C'l',T F: E: CI: F E : E *. : E OPEt ED / CLOSED CROSSTIE VALVES Ah; ;ET AINED PRESSURE T F. t h SI E NT T E A:!' A CE 1: $, E : .! E:-:  : :. L i,: E : N:

.,. FLOL A;;EC DYhAMIC SWEEP CF CF.CSETIE FE :E: TC FDCEDURE CROSSTIE VALVE OPERATION WAS RETESTED: NO HAMMER PRESENT UNDER NO FLOW 0125Il0003I

. 12/01/E7 4

VENTING TEST 11EP07-AF-0002 IfJLI.

FILLED AND VENTED SYSTEM WITHOUT BENEFIT' CF ADDED VENTS.

VENTED- SYSTEM WITH ADDED- VENTS AND COLLECTED AIR IN PL ASTIC BAGS.

RAN SYSTEM TO SWEEP CROS$ TIES PER ENHANCED VENTING PROCEDURE.

CPENED AND CLOSED X CONN WITH PUMP RUNNING ON MINI-FLOW.

DL 1 COLLECTION CUANTIFIED AIR BY COLLECTING IN PLASTIC EAGS.

DYNAMIC PRESSURE CHANGES IN SYSTEM.

l-': ::'1,

':: tES E:

lRAIN A 1.5 FT' 3Ch C O.E T:

1: A:N E 1.C FT*

a.-- ,. .

l CCNCLUSION REVISED VENTING PROCEDURE AND ADDED VENTS ENSURE A WATER SOLID SYSTEM.

(

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C1281/0003I

' 12/01/E7

, iENTING IEST iTEP07-AF-0002 0.FP011 e

~

DETERMINE THE CUANTITY OF AIR kHICH WOULD NCT HAVE SEEN VENTED F ROM THE SYSTEM PRIOR TO ADDING VENT VALVES IN THE HIGH POINTS OF I: AINS A C AhD D CROSSTIE LIhES AND ENHANCING THE SYSTEM VENT!hG FFOCEDURE.

[ESCRIPTION

~

-E SYSTEM WAS INITIALLY DRAINED THEN FILLED Ah; VENTED WITHOUT USE OF THE FIVE ADDED VENT VALVES AND USING THE OLD (REV. 4) VERSION OF Tr.E PLANT OPERATING PROCEDURE. PLASTIC BAGS WEFE THEN ATTACHED TO

'HE VENT VALVES AND ADDITIONAL AIR WAS COLLECTE AND MEASUPED.

[YNAMIC VENTING OF THE SYSTEM WAS THEN PERFORMED PER REV. 5 0F THE F. ANT OPE R ATING PROCEDURE. CROSSTIE VALVES WEEE THEN OPENED AND C.0 SED IN IRAIhS A AND D WITH A TR AIN PUMP 11 C*i MINIMUM FLOW AND Ih'

~

AINS E AhD C -WITh b IR AIN FUMF 12 ON MINIMLP t06.

2.i C : ; . : ' T I C ',

A;DITIOhAL AIR LHICh WAS VEhTED LAS COLLECTED Ih PL ASTIC BAGS WhICh

.EF,i

., Tr.Eh F A;E; 1h :iLIhDERI.AhD Th; '.C Uni CA. L ATEL. FiE55wRE

~ Ah!!.: EFS nE:E !N57 t L L ED Ih ThE MOTOR DFI\ E A :.P.FS St;i::', * *s ;

:::- 5 : ::- i>- : :, ,: : :n :- - -  : ,. ::n:,, .. ,:3 :, Et;r . : 11

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i. AIR WAS TRAPPED IN TFE SYSTEM PRIOR TO ADDING THE TEREE HEW VEhT V AL VE S .' THE FOLLOWIhG QUANTITIES WERE MEASURED:

3 TRAIN A 1.5 FT TRAIN C 0.5 FT 3 J 3

TRAIN D 1.0 rT

2. A WATERHAMMER WAS EXPERIENCED WHEN THE TRAIN D CROSSTIE VALVE WAS OPENED. DUE TO THIS EVENT THE VENTING PROCEDURE LAS FURTHER ENHANCED TO PERf0Rh A DYNAMIC SWEEPING OF THE CROSSTIE LINES.

l THE TEST WAS THEN RESE ATED WITH NO RESULTING WATERHAMPER. - - - -

Cc ', LUSIONS

! I-E REVISED VEN~ING PRCCE:,:E LITH TFE ADDED VENTS ANC TFE DYNAMIC 1

i 3 . E : : >. - T: t i, i . : E th E s ', : AL . y .:~r: !- :: 5iE.

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EC27C/0003I

, ADDITIChAL STEPS TAKEN TO ASSURE SYSTEM INTEGRITY l ADE PERFORMED ON DOUELE ROOT VALVE CONNECTIONS AND HIG STRESS POINTS J

VE ATS / INSTRUMENT ROOT VALVES AND ANCHOR REPL ACED PIPING AND PIPE a SUPPORT WALKDC' NS PE RF0FF.ED FOR ENTIRE "AF" SiSTEM l

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---

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12/01/E7 VIERATION TEST iTEP07-AF-0001 9

L ii' RAN ONE PUMP FROM MINI-FLOW TO FULL FLOW ON TEST LINE. l l

• RAN EACH MOTOR DRIVEN PUMP SEPARATELY TO EACH STEAM GENERATOR' L AND ON MINIMUM FLOW.

i.

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L C2 1 COLLECTION 1

DYNAMIC PRESSURE CHANGES ON PUMP SUCTION AND DISCHARGE.

I DYNAMIC PRESSURE CHAhGES DONNSTREAM OF' FLOW CONTROL VALVES..

-VIEF ATION RE ADING AT VENT. DR AINS. AND I' STRUMEhT CONNECTIONS.

{* ,Ts' LOW FRE0VENCY PRESSURE OSCILLATIONS LOW 2 PSI.

STEADY STATE VIERATICh LOW.

L u s I c i. c STEADY STATE VIBRATION NOT ROOT CAUSE OF PIPING AND SUPPORT FAILURES.

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I 12/01/E7

.:E RATION. IE ET iTEP07-AF-0001 0;DPOSE 9

INVESTIGATE THE'CAUSE OF INSTRUMENT TAP. VENT PIPING. AND DRAIN

DING F AILURES IN THE AUXILIARY FEEDWATER (AF) SYSTEM.

[ESCRIPTION ChE PUMP WAS RUN FROM MINIMUM FLOW TO FULL FLOW USING ITS TEST TO DETERMINE If ITS OPERATION BECAME MORE STABLE WITH IhCREASING F L CW..

EACH OF THE MOTOR DRIVEN PUMPS WAS RUN AT MINIMUM FLOW AND 6:TH FLOW TO EACH OF THE STEAM GENERATORS.

[LTA COLLECTION

ESSURE TFALSDUCERS WERE LOCATED NEAR EACH OF TrE MCTCS DRIVEN PUPP

.:TIONS Ah; DISCHARGES AND D:nhSicEAM OF EACF C: THE F:UR FLOW

.'t RCL ': ..::.

V: EFA': C N R E : : ', ~. . r. E : ? '*Eh L' E;;. :::7. V E t, .

At: DRAIN \ A . '. E CChhECTION IN THE ;L:. P2' ,

IF 'LE V: 5: LTION LA5

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AMPLITUDE WAS MADE IN E ACH OF THREE ORTHAGONAL DIRECTI0hs.

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ESELFE 05: ILLA"::',1 WERE E: E-' E E T A T P:' :"UM F L CW mITH A MAGNITUDE OF 2 PSI PE Ar, TO PE AK IN THE SUCTION AhD DISCHARGE.

WHICH DECREASED WITH INCREASING FLOW. A HIGHER MAGNITUDE OF UP TO PSI PEAK TO PEAK IS SEEN AT 60 HERT2. WHICH IS PUMP OPERATING SPEED.

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.- a 12/01/E7 FE s titis (CohT 'D)

TF: SE VENTS /ND DRAINS WITH ME ASURED VELOCITIES ABOVE 0.5 IN/SEC WE:E FURTHER REVIEWED USING THE MORE RE ALISTIC VELOCITY 'CRITERI A j DE:IVED BASED ON OM3. A REFINED VELOCITY CRITERIA WAS ESTABLISHED EASED ON THE UNIQUE COADITIONS OF THESE VENTS AND DRAIhS. SUCH AS CA',TILEVER TYPE CONSTRUCTION. NO INSULATION AND SCME ARE STAINLESS STEEL. THE REFINED VELOCITY 'CRITERI A ARE:

1 FOR STAINLESS STEEL 2.2 IN /SEC  ;

l FOR CARBON STEEL 1.3 'IN /SEC BASED Ch' THIS NEW VELOCITY CRITERIA. ALL THE MEASURED VELOCITIES  ;

WE:E REVIEWED.

ONLY TWO BRANCH LIhES ARE ABOVE Th!S NEW CRITERIA.

FC:. THOSE TWO LINE (AF251. AND AF176). HARMONIC FCRCE FUNCTION 4),ilYSES WERE PERFORMED. THE CALCULATED STRESSES ARE WITHIN ESIL'RANCE LIMIT-WITH GOOD MARGIh.

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4 12 / 01/ L' i

WATERHAMMER SCEhARIO #2 MULTIFEED PIPING VIBRATION WAS OBSERVED AND REPORTED BY PERSONNE ThE ISOL ATION VALVE CUBICLE AT 5:15 An ON 11-22-87 EE ngn ACTOR OPERATICNS DISP ATCHED AhD A 1" O DRAIN VALVE PIPING VIERATICN WAS CsSE: SED IN TRAIN "C" cue::LE AT THE CFCSSTIE VALVES AhD OTHER APEAS T. : - : . E Crie CETAINE: : ,: si;:E; F:F RELE.AN- : Ant-t: Ecs i

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DESCR1FTION CF PHYSICAL DAMAGE 1 i

PARTIAL CIRCUMFERENTIAL BREAK ON 1" DRAIN LINE - TRAIN "A" APPROXIMATELY IC FEET FROM CROSSTIE VALVE l

CRACKED EMBED ON ANCHOR THAT WAS PREVIOUSLY DAMAGED  !

SHEARED PIN Oh STRUT APPROXIMATELY 10 FEET FROM CF.CSSTIE kAlkE i

i 1

1 1

01I5I/0003I l I

12/01 'd DESCRIPTION OF PLANT OPERATING CONDITIONS PL ANT IN h0DE 3 - HE ATUP FROM 350 F TO 450*F ALL CEOSSTIE VALVES OPEhED I l

FuMP #12 IN OPERATION FEECING MULTIPLE STEAM GENERATORS i

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. i E:FDADS' RECORDINGS WERE REVIEWED TO SEE IF THERE WERE PERIODS WHEN PUMP. i

SCHARGE PRESSURES FLUCTUATED ABh0RMALLY. IkE ~0LLOLING PERICCS WERE I N;TED

L i 1

INDICATED TOTAL PRESSURE L:. DALE T1hE PUMP RUNNING FLOW RATE. FLUCTUATION (GPM) (PSI) 1 11/03/67 17:26-16:39 A 630-96 0-2000 I ii/CE/87 13:00-13:21 E 263-73 1'30-iE5:

3 11/C5/E7 19:10-19:21 B 350-90 730-2000 ii/ CELE 7 2C:3'-21::6 E 602-116 75;-2C::

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-: aE\ER. E5Ehi i CID h.i TRIGGER Ah! FEEES.AE ..:En5 Ih ini C O,' G L L .r b-ICH COULD INDICATE THAT THERE LAS A PROBLEM L:TH ONE OR MORE i:AhSDUCEF5 Db6IhG ThAT PERICL. i. v E hi 2 L;' n;~ IE;e;ER inE FEE 15 hi

1. ARMS EECALSE TrE PEESSURE SPIKES DID NCT E:' !ELOW TFE SETPOINT, h:

-; " AGE Ld5 'ETEC~EE LhTIL AE:.' 13:CC ON ii!E. IA*/:E LAS ALS :ETEC'EE

. ills e .: c  ::li2. Ih Ee:- ;A5E L: 5 E; *.. ::tE STE e GENEF: ::: ,:n

Ns FE:.

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f I e DEVELCPMEI.T GF TEST PLAf, REVIEb 0F COMPUTER DATA l REVIEW OF POTEhTIAL ROOT CAUSES SUCTION AIR ENTRAPMENT PtMP/YAFLA) If,TEFACT:;t,

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i 12/C1/i?

PCTENTIAL PROBLEMS

1. PUMP LOW FRECUEhCY PRESSUPE OSCILLATIONS HUNTING INSUFFICIENT NPSH AIR INLEAKAGE

2. ARC VALVE CAVITATION INSTABILITY AT CROSSOVER RANGE INTERNAL DAMAGE

3. PIPING

• l',TErz: I:'. L:T- AF: ,1.it Ai.: _-

A:: IALEAFAGE

4. I L O k. CONTROL VAL \ES CLVITATION T i '. .

L. :;r. CF E A: h:- / ; t C SI h.

5. X CONN VALVES CUICK OPENING / CLOSING HUNTING l 1

1

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12/01/E.-

POTEt,TIAL PRCELEMS

6. IANK VORTEX FLOW ELOCKAGE 4

7. CHECK VALVES

• - INSTABILITY LEAKAGE E. Flow ELEP.ENT CAVITATION 5, SYSTEP CPERATICL 4

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l St;C110h LINE TEST iTEP07-AF-0004

-EST l

PERFORMED HYDRO CN TR AINS A, 8 AND C SucTIch LIhES TO CUAtiTIFY TRAPPED AIR.

[ 'A COLLECTION lh I TI A L PR E S S :. P.E F I t, A L PEESSUFE  :

i CLAt.TI't CF 64 EF E.E0 CTF TC EETURN TO I',ITIAL ::ESSLFE.

id S I G t. II I C A r,! TRAPPED AIR FCUND l

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lHE VENTING PROCEDURE IS ADEQUATE FOR VENTIN6 0F THE SUCTIO LINES.

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1 01311/0003I l L _- ____________ _

PbMP TEST iTEF07-AF-00005 9

TEST ,

RM, B PLMP TEFCUGH C TRAIN TEST LINE FROM MINI FLOW TO FULL l FLOW. .

ESTABLISH ARC VALVE CRCSSOVER POINT STROKE CROSSTIE VALVES UNDER FLOW CONDITI0 tis  ;

i l

CATA COLLECTIONS 1

STATIC PRESSURE AhD FLOW l 1

DYhAMIC PRESSURE CHANGES PIPING MOVEMEhT l l

l EE5LLTS F :. F' P CLF\E FAS \E:i L*TTLE $LOFE EE.0L 2:.' GPM .

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OPERATION AT LOW FLOWS ON FLAT PART OF PUMP CURVE SHOULD BE AVOIDED 0130I/00011 1

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ATEF ? UMP':12 AND ITS

's A 5 50CI ATED AUTO RECIRCUL ATIOh C0ta h0h '( ARC) VAL.E AFCC66 BECOME L L'.5TAELE AT ANY POINT EETLEEh' MINIMON FLOL AND TLLL FLOW, TO E 5'ABLISH A PUMP CURVE FOR PLM* 12. AND TO TEST TEE. AFFECTS OF .

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I'iIh L AND TbE lRAIN C TEST LINE. FLOL weS Ih::E ASEC /DECRE ASEC- }N /

5':LL If,CREhEt,TS AR0thD TFE CEOSSOVER PCIhT FC: ~LE MC VAL \E TC O Y

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~: Ih;UCE IL5TAEILITY.- IME C:CSSTIE tALVES IN ~ : : : ?,5 5 A t,: _C LE;E n

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1. IhE PbMP CURVE hAS VERY LITTLE SLOPE EELCL 2;; GPM.

2. FLOL \AFIED EET6.EEN j?C Ah0 16C GPM WHILE CFERATING Ih THE i

TRANSITIOh ZONE OF THE ARC VALVE.

3. A b ATERHAMMER CCCURRED WHEN CLOSING THE "C" IR AIN CFOSSTIE VALVE

'j AG AINST APPROXIM ATELY E00 GPM. PIPING MCVEMENT OF 3/8 TC 1/2 L

INCH WAS INDIC ATE 0 Ih THE iv-5 DIRECTION OF TnE "C" IRAIN CECSSTIE LINE BUT N0 VISIELE DAMAGE W/S 00hE. ThE VALVE PCPPED CPEN IMNECIATILY AFTER CLOSURE.

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hLlil?LE ETEAM GENERC'.R l

FEED TEbT 1TEP07-AF-00C5 IEET TFAIN B PUhP WAS OPEFATED AT VAFIGUS FLCW FATES TO VARIOUS STEAM GENERATORS Ih Afi EFFCRT TO IhDUCE SUSTAIhED WATERHAMMER.

C:~A COLLECTICh bTATIC PRESSURE At,; FL0b CYhAMIC PFESSURE CHANGES EE:ULTS SLSTAIhED LATERHAMMEF Aci REPFCDUCED

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~S TEET ATTEMPTED TO AFPFCA:- TFE SYSTEM CFE: 4TIhG IhSTAEILITY Ex ERIENCED ON SUNDAY h0VEMBEF 22. 1567.

EESCFIPTICh I:iIN b PUMP 12 WAS OPERATED LMILE VARYING FLCL TC VARICUS C'MBIAATIONS CF ThE STEAM GENEFATORS. IHE FLCL CL/hTIT!ES A::ECXI* ATE THOSE ShCWN Ch EFJDADS PRINTOUT OF h;kEMEEE 22. 1987.

E: DACS LAS ALSO USED DURIfJG ThE TEST TO EST AELISh FLOLS TO E ACh S~EAM GENERATOR.

CATA COLLECTION F.MP SUCTION AtiD DISCdARGE PFESSURES. MIhIMLM FLOL DISCHARGE F: ESSURE. FLOW ELEMENT DIFFERENTIAL PRESSURE AhD MIhIMUM FLOW lit,E F.0L RATE ARE MONITORED USINC LOCAL INSTRUMENTATION. DYhAMIC F: ESSURE ChAh6ES ARE M0h'ITORED WITH PRESSURE TRANSDUCERS MOUhTED IN T-E PUMP SUCTIOh, DISCHARGE AND IN THE LINES TC ThE STEAM GEhERATCRS.

FESULTS IFE SAME EVENT TbAT LAS CESER'vED ON hCVEMEEc 22. 1527 WAS LCT REF;CCLCED.

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$TEADY STATE \IERATION LEVELS AT FULL- RAhGE OF FLOWS ARE.

ACCEPTAELE PER 1NDUSTRY STANDARDS CM3.

2.

ADCED VENTS AND REVISED VENTING PROCEDURES PROVIDE AN L ATE SCLID SYSTEh.

1.

PbtF CHARACTERISTICS COF.VE IS VERY FLAT AT THE LOW FLCL RAN LESS ThAh 200 GPM.

. i iAFLAY ALT 0MATIC RECIRCULATION VALVE HAS RELATIVELY STAELE .!

CRCSS0VER CONDITIOh BASED ON TESTING.

i.

kATERhAP,PER CAN EE PRODUCED UPON CLOSIhG Ah: 0PEhIhG CF CROSSTIE VA.,ES LIT- PLP Ih CFEEATICf. AtC CCLh5TFE

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CCILCIDEhT WITH + 20L PSI PRESSURE OSCILLATIONS kh2LE FEEDING I Mt.11FLE STEAM' GENERA 10RS FROM A SIhGLE PUMP.

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i f t '. i : E '. ~ . E F I T I C t, EFFECTS TrAT LEEE FRE',I'LSLY CEIEF\E:,

ECESCl00011

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1. :xif.anj Feedwater Operations Page 1 Administrative Controls Auxiliary Feedwater System Cross tie valves will be I::ked closed Manual operator blocking valve in the closec pas : On-Actuating air supply isolated Secured with steel cable and padlock Controlled by our locked valve program Auxiliary Feedwater System Cross-tie valves wit be Tanger Tagged."

Our danger tagging program prohibits anyone c?s than the accepting individual to authorize removal of these tags Cross connect valves may never be opened on an A;iliary Feedwater System train without...

Thc affected train being declared inoperable The affected Auxiliary Feedwater pump beir; ma:e incapab'e of staning DJring planned Auxiliary Feedwater System ope af: an ind vidual will be s.at One i the cub;;'s to monacr 10 vtrat:cn

• A.; ,' : ~ t : :f ;'1s ; ; .; .: ,'.*.I', E 2. ~ :"  :; - ~ i ~ ; ; I. : ' .; .e .;

I f i: ~.ed If tne Auxinary Feec.va:er Sys:em is in use, fiow w. + :ontrohec:

e - . re :y c r - - ~ . - 1.: t. r . . /. P r v g r. P. s 'e s : i; . ; . . , ; .~.

g ea:er tha . 2:0 gom inrcu;F ine feed reg ',2 .s

.:214.5.a.;6e3:e :. : 1. .:aoove Cr:Es c - e:: cos'I.. : r w ' te permted : :. u:

No multifeed operations are performed An individual is stationed in every cubicle which is cross connected

. Operator Training History of our problem 1

Reasons for locking closed the cross connecw and re:Jiring > 200 gpm flow Administrative controls Wed, Dec 2,1987 I

1

r + .

, Auxiliary Feedwater Operations Procedure revisions Operational flexibility impact 1' Procedure Revisions

• 100% review of all surveillance, emergency and operating prc:edures impact Revision of allimpacted procedures to reflect system operatier '..th Cross-connects closed and > 200 gpm flow requirement-Foreseen operational considerations with the Auxiliary Feedwt System configured as described The secondary plant must be capable of delivering Steam Gers ator C water upon entry into Mode 3 Repairs to the Auxiliary Feedwater System requir;ng system c 2 subsequent fill and vent t . . . . . _ --

. Auxiliry Feecwater System tra;n will al ready be inoperab e .vne '

~- ' ' *4 Ensu e pump is incacab'e c'starang be'ere opening c

13 ::

e l v.: ~ : cs.em

, . -( '

m .. . , . -

C ems: y :: :roi of De.:s 5:ea- Ge e at: r -

- ;"eavy5+t- '

if chemistry prob' ems develoo in mode ?. S'e wn ! be a. - "- '

rcn D p;mo to suopon b'0wd:w cc0'd--

I i

Wed, Dec 2,1987 i

9 l

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