ML20238C168

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Forwards Safety Evaluation Re Util 861111 & 17 Requests for Removal of MSIV Actuators from Four Valves Used to Maintain Secondary Containment Integrity.Proposed Changes Acceptable. W/O Safety Evaluation
ML20238C168
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 11/20/1986
From: Bernero R
Office of Nuclear Reactor Regulation
To: Mangan C
NIAGARA MOHAWK POWER CORP.
Shared Package
ML20238A944 List:
References
FOIA-87-438 NUDOCS 8709090687
Download: ML20238C168 (2)
v • d • e


Text

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( ",sg UNITED STATES NUCLEAR REGULATORY COMMISSION -p

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<  %, a . . . . p} November 20, 1986 Docket No, 50-410 ,

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Mr., C._ V. Mangan, ' Senior Vice President Niagara Mohawk Power Corporation 300 Erie Boulevard West Syracuse, New York 13202

Dear Mr. Mangan:

Subject:

Removal of MSIV actuators from Valves Being Used to Maintain Secondary Containment Integrity In letters dated November 11 and 17, 1986, you requested the staff to evaluate your proposal to remove the main steam isolation valve (MSIV) actuators from the four valves being used to maintain secondary containment integrity in order i to begin modifications on these actuators. <

As stated in SSER-S, earlier submittals had stated that the second valve in thelinewouldbeinstalledandoperablebeforeworkonthefirstvalvewastoi proceed. Your letter of November 11, 1986, stated that your proposal was to allow work on the MSIVs to proceed more efficiently without affecting the safety of the plant.

The staff has completed its review of your proposal and a copy of the safety evaluation is enclosed. This safety evaluation will be issued in the next supplement to the SER.

As discussed in the enclosed safety evaluation, the staff finds the proposal as discussed in your letters of November 11 and 17, 1986, to remove the MSIV actuators to expedite modifications is acceptable. The requirements for secondary containment i,ntegrity are unchanged.

If you have any questions relating to this letter or the enclosure, please con- )

tact the Licensing Project Manager, Mary Haughey at (3011 492-9422. i I

Sincerely, I i

)

lw Robert M. Bernero, Director y

Division of BWR Licensing j

Enclosure:

As stated cc: See next page FoI A ?? '/ 3 8 8709090687 070020 O///

PDR FOIA pr WETTERH87-430

. .' p.

November 20, 1986 Docket No. 50-410- .

FACILITY: Nine Mile Point Nuclear Station Unit 2 (NMP-21

. APPLICANT: NiagaraMohawkPowerCorporatir[(NMPC)

SUBJECT:

SUMMARY

OF OCTOBER 15, 1986, MEETING WITH NMPC ON MAIN STEAM ISOLATION VALVES FOR NMP-? )

~

On October 15, 1986, the NRC staff met with representatives of Niaoara Mohawk Power Corporation (NMPC)'and their consultants to discuss concerns related to the main steam isolation valves (MSIVs) for NMP-2. Handouts provided by NMPC at the meeting are included as enclosures 1 and 2.

NMPC presented their conclusions of their investigation of the root cause of recently identified leakage problems of the MSIVs. The root cause was identi-fied as a rocking and friction problem which occurred when the valve was in the partially open position. The spring arrangement in the valve seats would be modified to correct the rocking problem in the partially open position there-by eliminating the resultant galling problem on the valve balls. The galling

'had resulted in excessive valve leakage. NMPC stated their certainty that this was the root cause. NFPC stated that four MSIV balls would be repaired, installed and leak tested by October 76, 1986. Leak testing, as reouired by 10 CFR 50, Appendix J, would be performed between the seats with a leakage criteria of 6 SCFH.

NMPC stated the final deficiency reports in accordance with 10 CFR 50.55e would  !

be filed October 22, 1986. Those reports were to include information presented  ;'

durino the meeting.

NPC ouestioned NMPC on the possibility of vortex shedding of the MSIVs. NVPC stated that this phenomena had not been reviewed and would be difficult to determine.

NMPC stated that 36 days were scheduled between fuel load and the beginnino of the power ascension program which was scheduled for early December. All of the MSIY balls would need to he installed by the end of November to not affect the schedule for criticality. Actuator installation and testino was scheduled to take 3 days for each valve. Commercial power is scheduled for June 30, 1987.

The hydraulic cylinders on the modified NSIV actuators are not considered by NMPC to be safety related. Except for the added lip seal the cylinders are the same as those on the original actuator design.

Because of the iriportance of the prototype tesing proposed by NMPC to confirm the adequacy of the NMP-2 MSIVs, the NRC requested NMPC to submit the objectives of the prototype testing, the schedule for the testing and a commitment to submit the results of the testing to the NRC. The NRC stated that these items would be included in a license condition.

In addition, the NRC requested NMPC to commit to perform an additional leak test

  • / November 20, 1986 i.

[.-

o . Docket No. 50-410 FACILITY: Nine Mile Point Nuclear Station Unit 2 (NMP-2)

APPLICANT: . Niagara Mohawk Power Corporation (NMPC)

SUBJECT:

SUMMARY

OF OCTOBER 15, 1986, l'EETING WITH NMPC ON MAIN STEAM ISOLATION VALVES FOR NMP-?

On October 15, 1986, the NRC staff met with representatives of Niacara Mohawk power Corporation (NMPC) and their consultants to discuss concerns related to the main steam' isolation valves (MSIVs) for NMP-2. Handouts provided by NMPC at the meeting are included as enclosures I and 2.

NMPC presented their conclusions of their investigation of the root cause of recently identified leakage problems of the MSIVs. The root cause was identi-fied as a rocking and friction problem which occurred when the valve was in the partially open position. The spring arrangement in the valve seats would be modified to correct the rocking problem in the partially open position there-by eliminating the resultant galling problem on the valve balls. The galling had resulted in excessi"e valve leakage. NMPC stated their certainty that this was the root cause. NMPC stated that four MSIV balls would be repaired, installed and leak tested by October 26, 1986. Leak testing, as reouired by 10 CFR 50, Appendix J, would be performed between the seats with a leakage criteria of 6 SCFH.

NMPC stated the final deficiency reports in accordance with 'O CFR 50.55e would be filed October 22, 1986. Those reports were to include information presented during the meeting.

NPC ouestioned NMPC on the possibility of vortex shedding of the MSIVs. NMPC stated that this phenomena had not been reviewed and would be difficult to detennine.

I NMPC stated that 36 days were scheduled between fuel load and the beginnino of {

the power ascension program which was scheduled for early December. All of the l PSIY balls would need to be installed by the end of November to not affect the l schedule for criticality. Actuator installation and testino was scheduled to take 3 days for each valve. Commercial power is scheduled for June 30, 1987.

The hydraulic cylinders on the modified MSIV actuators are not considered by NMPC to be safety related. Except for the added lip seal the cylinders are the same as those on the original actuator design.

Because of the importance of the prototype tesing proposed by NMPC to confirm the adequacy of the NMP-2 MSIVs, the NRC reouested NMPC to submit the obiectives of the prototype testing, the schedule for the testing and a commitment to submit the results of the testing to the NRC. The NRC stated that these items would be included in a license condition, l

i l

In addition, the NRC requested NMPC to commit to perform an additional leak test

}

{

  1. 19 W E58- W g.

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5 of the MSIVs in accordance with the test and acceptance criterie in 10 CFR 50, Appendix J during the first outage.following the 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> warranty run or within 30 days following the 100 hour0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> warranty run, whichever is earlier.

A list of meeting attendees is included as enclosure. 3.

Pary F. Haughey, Project Manager BWR Project Directorate No. 3 Division of BWR Licensing

Enclosures:

cc See next page 1

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PWD-3: DBL D:BVD -

i MHaughey/vag EAdensam 11/j./86 11/p86

.5-Enclosure 3 10/15/86 MEETING-MSIVs NAME ORGANIZATION Mary F. Haughey NRC - Licensing Project Manager Jack Kudrick NRC/ DBL /PSB Frank Vitt NRC/ DBL /PSB Uayne Hodges NRC/ DBL /RSB E. G. Adensam NRC/ DBL /BWD-3 J. C. Linville NRC/RI/DRP R. A. Hermann NRC/ DBL /EB R. C. LaGrange NRC/ DBL /EB J. Lombardo NRC/ DBL /EB T. Vana Stone & Webster P. Teperou Stone & Webster Yarren Wang Stone & Webster A. F. 7allnick NMPC - Licensina p C. E. Crocker SWEC - Engr.

D. A. Boe SWEC - Engr.

l C. G. Per.kham NMPC J. P. Thomas Duquesne Light Co.

A. Fiorente SWEC - Engr.

T. D.. Fay NMPC - Licensing P. A. Cushman NMPC - Licensing J. C. Putton R9chester Gas and Elec.

E. R.: Klein NMPC R. P. Abbott NMPC D. L. Pike NMPC John E. Arthur Rochester Gas and Electric T. J. Perkins NMPC A. E. Kintigh NYSEG F. A. Durka SWEC W. D. Donlon NMPC Wm. R. Schmidt FPR Associates. Inc i t

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MSIV LONG TERM. PROGRAM OBJECTIVES 0

CONFIRM FAILURE MECHANISMS .

O REVIEW EXISTING DESIGN / MATERIALS ,

s 0

FULL SCALE PROTOTYPE TESTING 0

DESIGN / MATERIAL ENHANCEMENTS 0 "

DEM0KSTRATE LONG TERM OPERABILITY i

. _ _ _ _ . _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ a

  • 6 1'

Niagoro Mohawk Power Corporation Nine Mile Point Unit 2 .

MSIV Program NMPC Program Manager C. Terry Long Term Contingency ,

Short Term Plans Program Program J. Hutton D. Pike E. Klein i D. Pracht

  • Site Contact

,eLiolson with short term actMties General Westinghouse Stone & Crost;y MPR Electric Webster

  • Project Manager e consultant e Consultant
  • Consultant o Vender e Specific tosks Representative o Task definitions e Specific tasks
  • Specific tasks e Specific toska e Specific tasks o Technical Review e Periodic status reports
  • Final report

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MSIV LONG TERM PROGRAM i

l GENERAL DESCRIPTION

' *- PHASE 1 FAILURE ANALYSIS OPERATIONAL EXPERIENCE VALVE / ACTUATOR DESIGN REVIEW EVALUATE BALL / SEAT MATERIALS INITIAL PROTOTYPE TESTING PHASE 2 IDENTIFY DESIGN ENHANCEMENTS SELECT MATERIAL CHANGES PROTOTYPE TESTING PHASE 3 DETAILED MODIFICATION DESIGN DESIGN VERIFICATION TESTING MATERIAL PROCUREMENT INSTALLATION / PREOP TESTING -

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e MSIV LONG TERM PROGRAM l' PRELIMINARY SCHEDULE L.

. PEASE 1. REVIEWS OCT '86 - 3AN '87

  • INITIAL PROTOTYPE TESTING FEB '87 - MAR '87
  • SELECT ENHANCEMENTS APR '87 - JUN '87
  • TEST ENHANCEMENTS JUL '87 - DEC '87 FINALIZE DESIGNS JAN ' 88 MAR '88
  • DESIGN VERIFICATION APR '88 - DEC '88 PROCURE MATERIALS MAR '88 REFUELING OUTAGE MAR '89

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Eub.we .2 J MSIV B ALL V ALVES NRC MEETING -

OCTOBER 15, 1986 AGENDA l

i oBACKGROUND...............................C.D. TERRY i

oOVERVIEW...................................C.D. TERRY o RESOLUTION OF LE AK AGE PROBLEMS. . . . E.R. KLEIN l 0 AC T U AT OR MODIFIC A TIONS . . . . . . . . . . . . . E.R. KLEIN o L O N G R A N G E P R O GR A M S . . . . . . . . . . . . . . . . . J. H U T T ON O CONCLUSIONS..............................C.D. TERRY NWW$tVWP29

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BACKGROUND

  • ACTUATOR PROBLEMS DISCOVERED E ARLY AUGUST
  • LEAKAGE PROBLEMS DISCOVERED L ATE AUGUST ,

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  • INTERIM MEETING WITH NRC SEPTEMBER 24
  • INTERIM 10 C F R 5 0. 5 5 ( e ) REPORT LEAKAGE NROBLEMS -

OCTOBER 8 i

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O V E R VIE W

  • RESOLUTION OF LE AK AGE -PROBLEMS TESTING / ANALYSIS OF PROBLEMS

- ROOT C AUSE DETERMIN ATION

- EV ALU ATION OF OPER ATING CONDITIONS ST ATUS OF REP AIRS

  • ACTU ATOR MODIFIC ATIONS DESCRIPTION CONFIRM ATORY TESTS SCHEDULE
  • LONG RANGE PROGRAMS PROGR AM DESCRIPTION SCHEDULE / STATUS
  • CONCLUSION l

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e RESOLUTION OF LE AK AGE PROBLEMS >

  • REVIEW OF PREVIOUS D AT A e REVIEW OF IN PL ANT TEST DAT A e M ATHM ATIC AL ANALYSIS e TESTING SITE RESULTS LABORATORY RESULTS MET ALLURGtC AL CONCLUSIONS
  • SCHEDULE

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SUMMARY

COEFFICIENT OF FRICTION e REQUIRED TO INITI ATE " ROCKING" 4 .5 B AL ANCED SPRINGS I ,

e UNION C ARBIDE TEST RESUCTS .3 .5 e THEREFORE, " ROCKING" OCCURS-B AL ANCED SPRINGS t

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MODIFIED SPRINGS

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o HY DR AULIC CYLINDER ENHANCEMENT e MODIFY THE EXISTING CYLINDER DESIGN

. ADDED MECHANICAL STOP TO EST ABLISH FULL OPEN POSITION e ADDED LIP SEAL TO PISTON FOR LEAKAGE CONTROL -

e PROOF TESTING OF HYDR AULIC CYLINDER

= HYDRO TEST TO 2250 PSI

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  • CYCLE 100 TIMES FOR BRE AK-IN

= CYCLE 5 TIMES UNDER LO AD M AINT AINING 1500 PSI e PRESSURIZE CYLINDER AND ME ASURE LE AK AGE

< 1/2 CUBIC INCH PER MINUTE I

eISSUE TEST REPORT

  • SWEC PO A WITNESS TESTS wwustv uo n

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! SOV MODIFIC A TIONS e TEST RESULTS INDIC ATED EXISTING 'O' RING l NOT ' SUIT ABLE i

'O' RING WEDGED' AT- PRESSURE DEL AY'IN ACTUATION AT PRESSURE I

  • ADDITIONAL MATERI ALS TESTED

= TEFLON

  • R ADI ATION CONCERN
  • MECH ANIC AL ST ABILITY CONCERN
  • TEFZEL
  • TOO HIGH COEFFICIENT OF FRICTION
  • GR APHITE FILLED TEFLON .
  • ENVIRONMENT ALLY OU ALIFIED FOR > 25 YRS
  • NO DEL AY IN ACTUATION 1

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TESTING RESULTS i l e CYCLE. TIMES j l

  • 20 HOURS l

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  • LEAKAGE l

.Sov e UNDETECTABLE

  • HYDRAULIC CYLINDER j
  • < 1/2 CU. IN. PER MIN.

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  • RESPONSE TIME
  • SOV TRIP WITHIN .5 SEC.

. MSIV CLOSES WITHIN 3 TO 5' SEC. CLOSURE REQUIREMENT NhndSIVWP38

-y L- . TARGET SCHEDULE I

^

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ADDITION AL EOUIPMENT ON SITE I

NEW HYDR AULIC CYLINDER 10 /15 l J

NEW SE ALS FOR SOV .,

10 /15 .

i INST ALL EQUIPMENT 10 /15 -

10 / 21 .

TESTING 10 / 21 -

11/ 3 -

MSIV'S ACTU ATORS COMPLETE 11 / 5 e

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m CONCLUSION -

LEAKAGE PROBLEMS

~

  • SUFFICIENT UNDERST ANDING OF ROOT CAUSE TO DEVELOP FIX FOR OPERATING CYCLE e AN ALYSIS OF OPER ATING CONDITIONS DO NOT ADD SIGNIFIC ANTLY TO SE AT

" ROCKING" PROTOTYPE TESTING WILL CONFIRM AN ALYSES OR IDENTIFY PROBLEMS E ARLY IN OPER ATING CYCLE MID-CYCLE " TYPE C" TESTING PROVIDES ADDITION AL ASSUR ANCE

  • FIN AL FIX TO BE THOROUGHLY DEVELOPED AND TESTED BEFORE FIRST REFUELING OUTAGE
  • DESIGN AND PROCUREMENT FOR CONTINGENCY PROGRAMS CONTINUES ON AN EXPEDITED B ASIS i

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4 l CONCLUSION - ACTUATOR MODIFICATIONS e FIRST CYCLE FIX -

MODIFIC ATION OF HYDR AULIC SYSTEM l

ACCEPT ABLE MATERIALS VERIFIC ATION TESTING IN SHOP _

- PRELIMIN ARY AND ST ART-UP TESTING WILL l COMPLETELY VERIFY OPER ABILIT Y l e MECH ANIC AL L ATCH BEING DEVELOPED AS P ART OF LONG R ANGE PROGR AM NWW$1VWp2 8

7-___-_.

' November 20, 1986-

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MEETINr,

SUMMARY

DISTRIBUTION Docket No(s): 50-410 NRC PDR Local PDR.

BWD #3..r/f J.'Partlow E. Adensam Attorney, OGC E. Jordan B. Grimes r ACRS (10)

Project Manager M. Hauchov

~ ~

E.:Hylton NPC PARTICIPANTS.

M. Haughey Jack Kudrick Frank Witt s*" Wayne Hodges E. G. Adensam

'J. C. Linville R. A. Hermann R. G..LaGrange J. ' Lombard o L

i bec: Applicant & Service list foZ 4-S?-V38 B//.t

y:

lh ./

.i

{.,

f T l

e f, ^ %,

f(

i 4

, 7 Mr. C. V. Mangan. .

-Niagara Mohawk Fower Corporation Nine2Mlle Point Nuclear StatNn o

Unit -

, o 6(

,f Cc: ,.

  • " #I

' Mr. Troy B. Conner, Jr. , Eso,.

Conner & Wetterhahn ' Regional Administrator, Region I Suite 1050 .U.S. Nuclear Regulatory Comission 1747 Pennsylvania Avenue, N.W. 631 Park Avenue

! Washington...D.C. '20006 King of Prussia, Pennsylvania 19406 1

Richard Goldsmith - Mr. Paul D. Eddy.

Syracuse University New York State Public Serice College of Law . Commission

.E. 1. White Hall Campus Nine Mile Point Nuclede Station -

Syracuse, New York'.32223 Unit'11. I P.O. Box 63 Lycoming, New York 13093 Assistant Attorney General Environmental Protection Bureau Mr. Richard M. Kessel New York State Department of Law Chair and Executive Director 2 World Trade Center State Consumer Protection Board New York,.New York 10047 99 Washington Avenue l Albany, New York 12210 ,

Resident Inspector g Nine Mile Point, Nuclear Power Station P. O. Box 99' Lycoming, Ney 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 ' a' 631 Park Avenue .4 ing of Prussia, Pennsylvania 19406 M Norman Rademacher, licensing Niacara Mohawk Power Corporation

300 Erie Boulevard West Syracuse, Feo " "k 13202 e ;

Don' Hill Niagara Mohawk Power Corporation Suite 550 4520 East West Highway Bethesda, Maryland 20814 7

_ - - - - _ - _ - - - - -

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