ML17055C534

Summary of 860924 Meeting W/Util & S&W Re Problems W/Msiv Actuator Latching Mechanism & Galling of Valve Ball.List of Attendees & Viewgraphs Encl

ML17055C534
Person / Time
Site:	Nine Mile Point
Issue date:	10/09/1986
From:	Haughey M Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8610210015
Download: ML17055C534 (84)

Text

October 9,

1986 Docket No. 50-410 APPLICANT:

Niagara Mohawk Power Corporation FACILITY:

Nine Mile Point, Unit 2

SUBJECT:

MEETING

SUMMARY

FOR SEPTEMBER 24, 1986, MEETING ON MAIN STEAM ISOLATION VALVES On September 24, 1986, the staff met with representatives of Niagara Mohawk Power Corporation (NMPC) and their consultants from Stone and Webster Engineer-ing Corporation (SWEC) to discuss problems with the main steam isolation valves (MSIVs) at Nine Mile Point, Unit 2 (NMP-2).

In the last several months NMPC has discovered major problems with the MSIV actuator latching mechanism and galling of the valve ball.

On August 27, 1986, the staff met with NMPC to discuss the August 22, 1986, exemption request on the MSIV actuator problem.

Subsequently, the exemption request for the actuators was revised and resubmitted on August 28, 1986.

While the staff was in the process of reviewing the revised exemption request the MSIV actuators, NMPC identified an additional problem concerning the leakage rates of the MSIVs.

In the process of performing some additional leak rate tests in late August 1986, NMPC discovered these valves were leaking at a rate sign-ificantly higher than during tests performed in spring of 1985, and spring of 1986.

Upon disassembly, NMPC discovered galling of the tungsten carbide coat-ing on the valve ball.

When the ball was rotated during opening and closing of these valves, the galled tungsten carbide was passing over the stellite valve seats and scoring them.

This scoring resulted in the much higher valve leakage rates.

NMPC then embarked on a testing program of these valves.

The one successful test invloved a spare valve ball, a modified spring arrangement for the valve

seat, and a modified valve operator which used hydraulics rather than a latch-ing mechanism to hold the valve open.

The valve was cycled 75 times.

Leak tests were performed after 5, 15, 25, 35, 45, 55, 65 and 75 cycles.

The leak rate for all tests was below the 6 SCFH allowable leakage rate.

At the time of the September 24, 1986, meeting, NMPC had scheduled additional testing with an MSIV with a "blended" ball (i.e., the galled surface had been machined to smooth out the rough edges),

the new seat

assembly, and a modified actuator.

This test was completed on September 26, 1986.

This valve assembly did not pass the leakage test after 2 cycles.

After disassembly it was deter-mined that the galling problems were continuing and that a blended ball was not acceptable.

NMPC has stated in discussions with the staff, that it is proceeding with re-moving the old tungsten carbide coating and recladding the valves.

A revised exemption request was submitted October 2, 1986, and is under review.

The complete report is scheduled for submittal October 10, 1986.

8610210015 861009 i

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October 9, 1986 i ~'EETING

SUMMARY

DISTRIBUTION

~Docket No(-s.).:

50-4'10~

NRC PDR Local PDR BWD k3 r/<

J. Partlow E. Adensam

Attorney, OGC E. Jordan B. Grimes ACRS (10)

Project Manager M. Hau he E. Hylton NRC PARTICIPANTS R. K. Shaw J.

D.

Page R.

M. Bernero E.

G.

Adensam F. J. Witt A. J. Fiorente J.

Lombardo R.

G.

LaGrange B. Turovlin Jack Kudrick Gus Lainas Jerry Hulman Wayne Hodges Owen Rothberg H. F. Conrad R. A. Hermann bcc:

Applicant 5 Service List

p IC ir

Mr. C.

V. Mangan Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Unit 2 CC:

Mr. Troy B. Conner, Jr.,

Esq.

Conner 5 Wetterhahn Suite 1050 1747 Pennsylvania

Avenue, N.W.

Washington, D.C.

20006 Richard Goldsmith Syracuse University College of Law E. I. White Hall Campus

Syracuse, New York 12223 Ezra I. Bialik Assistant Attorney General Environmental Protection Bureau New York State Department of Law 2 World Trade Center New York, New York 10047 Resident Inspector Nine Mile Point Nuclear Power Station P. 0.

Box 99

Lycoming, New York 13093 Mr. John W. Keib, Esq.

Niagara Mohawk Power Corporation 300 Erie Boulevard West

Syracuse, New York 13202 Mr. James Linville U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Norman Rademacher, Licensing Niagara Mohawk Power Corporation 300 Erie Boulevard West

Syracuse, New York 13202 Don Hill Niagara Mohawk Power Corporation Suite 550 4520 East West Highway

Bethesda, Maryland 20814 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Mr. Paul D.

Eddy New York State Public Serice Commission Nine Mile Point Nuclear Station-Unit II P.O.

Box 63

Lycoming, New York 13093

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ATTENDEES MSIV MEETING 9/ 24/ 86 ENCLOSURE 2 R. A. Cushman A. F. Zallnick C.

E. Crocker C.

D. Terry M. A. Durka M. A. Fachada E.

R. Klein T. D. Fay D. L. Hill K. F. Roenick H. K. Shaw J.

D. Page R.

M. Bernero E.

G. Adensam F. J. Witt A. J. Fiorente J.

Lombardo B. Miller R.

G. LaGrange B. Turovlin Jack Kudrick Gus Lainas T. J. Perkins C.

Mangan Jerry Hulman Wayne Hodges Owen Rothberg H. F. Conrad R. A. Hermann ORGANIZATION NMPC NMr C SWEC NMPC SWEC SWEC NMPC NMPC NMPC NYS PSC NRC/DBL/EB NRC/NRR//DSRO/E1B NRC/DBL NRC/DBL NRC/DBL/PSB SWEC NRC/DBL/EB BNL NRC/DBL/EB NRC/DBL/EB NRC/DBL/PSB NRC/DBL NMPC NMPC NRC/DBL/PSB NRC/DBL/RSB NRC/NRR/DSRO NRC/DBL/EB NRC/DBL/EB

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The modified actuator design used a solenoid valve with a teflon seat.

As teflon does not perform well in a radioactive environment, NMPC is looking for an alternate material for the valve seat.

NMPC is also developing a plan for additional long-term prototype testing of these valves.

Enclosure 1 contains a handout provided by NMPC of the slides used for their presentation.

Enclosure 2 contains a list of meeting attendees.

Enclosure:

As stated Mary F. Haughey, Project Manager BWR Project Directorate No.

3 Division of BWR Licensing BWD-3:

L MHaughey/vag 10/

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KELZ tLSl3 KKF TJJk5 SEPTPBER 20, 1986 o

GENERAL OVERVIEH o

NIAGARA MOHAWK MANAGEMENT TEAM AND PROGRAMS o

TESTING/ROOT CAUSE ANALYSIS o

SEAT LEAKAGE o

ACTUATOR FUNCTION o

CON CLUS ION

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TFRRY E,

R, KLEIH Valve Operability Programs:

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Seat Leakage

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Closure Time HUTTON Testing Progroms:

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Prototype Tests

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Nechanical Latch D, L. PIKE Contingency Progroms:

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Y Pattern Valves

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Leakage Control System

TESTING PROGRAMS THOPOUGH ROOT CAUSE ANALYSIS OF LEAKAGE PROBLEMS Dedicated Manager Consultants MPR, GE, M,

CROSBY Discussions with Other Users Swiss and Beaver Vol ley Prototype Test Setup Being Expedited DEVELOPMENT OF MECHANICAL LATCH FOR VALVE CLOSURE Reduction of Inadvertent Actuations llill Use Prototype Setup to Verify Operability

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LEAKAGE ORIGINAL DESIGN GENERAL DESCRIPTION SEAL DESIGN PROBLE j DESCRIPTIOK BALL CONDITION BEARING PRESSURE

'ON BALL LEAKAGE TEST RESULTS PROPOSED SOLUTION OPTION 1 REWORKED BALL OPTION 2 RECOATED BALL AND REVISED SPRINGS TEST RESULTS TEST PROGRAM AND BASIS OPTION 1 RESULTS OPTION 2 RESULTS SCHEDULE

2IlSS 4 HYV78 STEAM TUNNEL PEN.

Z-1B 2aISS +HYV48 PRIMARYCONTAINMENT 2MSS~HVVXA PEN.

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BONNET RETAINER 1 OADING RING SEAL RETAINER PRESSURE SEAL BEARING PLATE.

LANTERN RING BONNET ROLLER BEARING BEARING RETAINER XNSTALLED ON BOTH SIDES SPOOL/SEAT SPRING RETAINER SPRXNG COVER THRUST RASHER BEARING RETAINER BOLLER BEARING BODY

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MSIV SEAL ARRANGEMENT DETAIL A"

SEAL ASSEMBLY SEAL SEAT-ENCAPSULATED SPRINGS SPRING RETAINER SPRING COVER MULT IPL E SPOOL SEALS BALL SURF'ACE BALL NMMSIVM024

BALL CONDI ON-TOP VIEW DAMn(,co AacA 33.000 OIA 9.000 'DIA DAMAGED ARKR 10.500'1.000"

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Zu FOOTPRINT STRESS OIACRAM 4 ehLL fOOTPRINT STRESS DIAGRAM C7

TYPE "C" TYPE "C" 4/85 3/86 TYPE "C" 9/2/86 6A 68 6C 6D 7A 7B 7C

0. 89 1.37 0,321 0,99 0,34 2,778 0,798 0.306 1,09 0.54 0,158

0. 215 0,084 1.183 0,199 0,088 22 37.3 42 30.3 23.6

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TS BOOTES:

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ALL VALVES STROKED FOR ACTUATOR TESTl"t" BETWEEN 3/se AND 9/86 2)

ALL TESTING DONE BETWEEN SEATS 3)

ALLVALuES IN SCt=R 0

P EXISTIRS SPRlhl6 DES IN REWORKED BALL 75 CYCLES OP 08 2

D-REVISED SPRINb DESI(iN RECOATED BALL 75 CYCLES

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R E V I S E D S P I,' H C,' '. (. Y 24 1151

'SPRINGS Rc. MOV) i -1158 S>RINGS ADD 8-57k SPRY'iGS (TOTAL 16 SPF 24->>58 SPRINGS TOTAL 64 SPRINGS

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BASED ON 1ST REFUELING (30 M04THS)

ISI 8,

RPS (1 MONTH)

UNANTICIPATED TRIPS PLANNED TRIPS ACTUATOR CHECK OUT PRE OPERATIONAL TESTS 30 25 To 33 FOR TESTING USE TOTAL 75

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TES3 P395P.Pi"i ACCUNIULATED STROKES BETWEEN SEATS THROUGH SEATS 15 25 35 45 55 X

X 75 X RECORD IN LEAKAGE AT STEADY STATE CONDITIONS

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".C" TE T ULT STROKES 5

15 25 35 45 55 65 75 OPTION 1 TS 6D BS 5,1 11,2 5,5 10,9 51 132 OPTION 2 TS 7D BS 23 4,8 2.9 4;9 4.7 4,4 4.2 3,2 4.0 3.9 4.4 TS -

THROUGH SEATS BS - BETHEEN SEATS ALL VALUES,IN SCFH

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ilSIV ACTUATOR ORIGINAL DESIGN PROBLEN DESCRIPTIOR PROPOSED SOLUTIOQ DESIGN CONCEPT HYDRAULIC SYSTEM EQUIPMENT SAFETY FUNCTION SEISMIC QUALIFICATION TESTING RESULTS LEAKAGE CYCLE TIMES

RESPONSE

TIMES SCHEDULE

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MSIV CLOSURE MECHANISM SPRING CAN TO CLOSE BALL VALVE TANK HYDRAULIC C YLINDER TRIP SOLENOIDS PUMP MOTOR

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MSIV ACTUATOR ORIGINAL DESIGN A.

VALVE OPENING SEQUENCE SOVS CLOSED HYDRAULIC PUMP ON VALVE 60ES TO OVERTRAVEL LATCH SLIPS INTO PLACE PUMP IS SHUT OFF OPEN SOVS

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%1V ACTUATOR ORIGINAL DESIGtt BE TEST MODE VALVE IS ON THE LATCH CLosE SOVS TRIP THE LATCH CATCH VALVE MOTION ON HYDRAULIC SYSTEN DESIGN CAPABILITY TO DUMP SOVS ON COYit<AND

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."lSIV ACTU4198 PROBLE"l DESCRIPTIVE%

SOLEROIDS DID 'NOT TRIt'HE NSIV LOAD REQUIRED TO TRIP INCREASES WITH TINE AT 12 HOURS -

LOAD INCREASED BY 1.5X AT 24 HOURS -

LOAD INCREASED BY 2,0X AT 7 DAYS -

LOAD INCREASED BY 3.0X PRESENT SQLEROIDS ARE NOT ADEQUATE TO TRIP NSIV

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MS I V ACTUATOR PROPOSED

."lOD I F I CATION DESIGN CONCEPT USE THE EXISTING HYDRAULIC SYSTEM TO KEEP THE VALVE OPEN ADD NO CAT I

EQUIPMENT MAINTAIN SAFETY OPERATION OF MSIV MINIMAL CHANGES TO THE ACTUATOR

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NSIY ACTUATOR PROPOSED NODIFICATION EGUIPilENT EXISTING HYDRAUL'IC EQUIPMENT PIPING 304SS SCH.

40.109" TO.154" WALL THK; FLEX HOSE 2509 PS I RAT ING HYDRAULIC CYLINDER HYDROLINE HL-E-269 PUMP 3

HP 3

GPM 1500 PSI SOV TARGET ROCK BALANCED PISTON DESIGN DESIGN PRESSURE 1950 PS I SA 182 TP 316 NAX. DIFFERENTIAL PRESSURE 1450 PS I

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NS I V ACTU/'TOP.

0 PROPOSED t'iODIF I CAT IONS 0

EQUIPNENT 0

ADDED EQUIPMENT 0

HYDRAULIC ACCUMULATOR 0

PARKER PISTON TYPE 0

PISTON HAS EPR SEALS 0

2S 6ALLON CAPACITY 0

JOCKEY PUMP 0

3/0 HP, 0.6 GPM 1800 PSI 0

PRESSURE SWITCHES (2),

STATIC 0-RING 0

MODIFIED EQUIPMENT 0

HYDRAULIC CYLINDER 0

NECHANICAL STOP 0

LIP SEAL EPR 0

SOY 0

DISK 8 0-RING NATERIALS ARE BEING QUALIFIED BY TESTING

REPLACED ITEMS:

C YLINDER NEW:

PRESS SWITCHS ACCUMULATOR JOCKEY PUMP MSIV CONVERTED HYDRAULIC SYSTEM 2 8

.RESV SOLENOID VALVES s

NC 2

SOV Ps s/s'OV Qs 2" SOV RV SET I 1500 PSI HYDRAULIC ACCUMULATOR STRAINE 1/4 0 2 I 1/4 8

'/4 8 JOCKEY MOTOR PUMP I

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24 STROKE 14 80RE 2i/2'YLINDER 1500 PSI PT 2 8 HOSE FIL T Ef~

CHECK VALVI PS (2)

PUMP

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NSIV AC'tUATOR PROPOSED NODIPICATION SAFETY FUNCTION NECHANICAL SAFETY OPERATIOfi IS ESSENTIALLY UNCHANGED RELEASE OF STORED ENERGY IN SPRINGS HYDRAULICS CONTROL VALVE CLOSURE TIME

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"LSIV ACTUATOR PROPOSED MODIFICATION SE I S."il C/DYNAMIC QUALI~ I CATION DETERMINE EFFECTS OF IODI~ICATION 08 ACTUATOR ASSEtjBLY DYNANIC RESPONSE -

CO"<. LETE ME IGHT CHANGES ARE INSIGNIFICANT STIFFENESS CHANGES ARE INSIGNIFICANT REQUIRED RESPONSE SPECTRA AT THE ACTUATOR ASSEMBLY BASE REMAIN UNCHANGED DYNAM1C TEST RESULTS FOR THE ACTUATOR ASSEMBLY ARE UNAFFECTED AND VALID (EXCEPT FOR SOME COMPONENTS DISCUSSED BELOW)

DETERNINE QUALIFICATION ADEQUACY OF THE SOVS DETERMINE SE I SMI C/DYNAMIC REQUIREMENTS 4T THE SOV LOCATION - UTILIZING TEST

RESPONSE

SPECTRA AND NODAL ANALYSIS ESTABLI SH QUALIF ICAT ION OF SOVS BY ~

SIMILARITYTO EXISTING TEST DATA QUALIFICATION OF ADDITIONAL PANEL AND RELAYS DETERMINE SE I SMI C/DYNAMIC REQU I REMENTS QUALIFICATION OF RELAYS UTILIZiNG EXISTING TEST DATA QUALIFICATION OF PANEL SY ANALYSIS

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NS IV ACTUATOR TESTING RESULTS LEAKAGE SOV UNDETECTABLE HYDRAULIC CYLINDER 2 Cu, IN./MIN.

OTHER VERY LOW CYCLE TINES DESIGN ACTUAL PRESSURE BAND 30 ~iINUTES 20 NINUTES TO 3 HOURS 1000 PSI 1250 PSI

RESPONSE

TINES WITHIN 5 SEC e

VALVE CLOSURE REQUIREMENT TRIPPING EITHER VALVE INDEPENDENTLY

0 SCHEDULE ADDITIONAL EQUIPMENT ttEH HYDRAULIc CYLINDER NeW DISKS/SEATS INSTALL EQUIPNENT SEISMIC GUALIFICATION TESTING NSIVS COMPLETE 9/25 10/10 10/15 10/15 - 10/21 10/21 10/21 11/3 11/5

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CONCLUSION NODIFIED HYDRAULIC SYSTEN 0

NINIMAL CHANGES O

NO ADDITIONAL QA CATp I

EQUIPMENT 0

SAME SAFETY OPERATION 0

SUCCESSFUL DEMONSTRATION TESTING

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ONCLU o

LEAKAGE TESTING MITH VALVE CYCLING GIVES CONFIDENCE OF VALVE OPERABILITY THROUGH FIRST REFUELING OUTAGE o

PREOPERATIONAL AND SHOP TESTING PROGRAN MILL CONFIRYi ACTUATOR OPERABILITY BEFORE HEAT UP o

LEAKAGE TESTING TESTING CONDUCTED SHOMS BETMEEN SEAT TEST IS CONSERVATIVE o

TESTING PROGRAtiS

-PROVIDE CONPLETE UNDERSTANDING OF ROOT CAUSE

-DETERMINE NEED AND TYPE OF. LONG TEfN NODIFI-CATIONS, IF ANY

-DEVEI OP NECHANICAL ACTUATOR LATCH

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