ML20212F360
| ML20212F360 | |
| Person / Time | |
|---|---|
| Issue date: | 09/22/1999 |
| From: | Wen P NRC (Affiliation Not Assigned) |
| To: | Carpenter C NRC (Affiliation Not Assigned) |
| References | |
| PROJECT-689 NUDOCS 9909280135 | |
| Download: ML20212F360 (30) | |
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4 UNITED STATES 3
j NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20656 0001
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September 22, 1999
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i MEMORANDUM TO: Cynthia A. Carpenter, Chief Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory improvement Programs Office of Nuclear Reactor Regulation FROM:
Peter C. Wen, Project Manager M C.
Generic issues, Environmental, Financial and Rulemaking Branch Division of Regulatory irriprovement Programs Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF SEPTEMBER 16,1999, MEETING WITH THE NUCLEAR ENERGY INSTITUTE REGARDING MOTOR-OPERATED VALVE PERFORMANCE PREDICTION METHODOLOGY (ADDENDUM j
1 AND 2 TO ELECTRIC POWER RESEARCH INSTITUTE TOPICAL REPORT TR-103237-R2)
On September 16,1999, representatives of the Nuclear Energy institute (NEI), Electric Power Research Institute (EPRI), and an EPRI contractor met with Nuclear Regulatory Commission (NRC) staff at the NRC offices in Rockville, Maryland. Attachment 1 lists attendees at the meeting. The purpose of the meeting was to discuss the submittal of a revision to the EPRI Topical Report TR-103237-R2, "EPRI Motor-Operated Valve Performance Prediction Program."
The submittalinclude Addendum 1," PPM Version 2.0," and Addendum 2, " Thrust Uncertainty Method," to TR-103237-R2; NEl submitted these reports for NRC staff review on September 1, 1999.
At the outset of the meeting, NEl provided an overview of the addenda to the EPRI topical report and a proposed schedule for completing the staff's review. For each of the addenda,
'J NEl requested that the staff prepare a supplement to the Safety Evaluation dated I
March 15,1996, on the topical report describing the EPRI MOV Performance Prediction Program. The staff will review the addenda over the next few months with technical assistance from the Idaho National Engineering & Environmental Laboratory (INEEL) which assisted in the gg review of the EPRI topical report. See Attachment 2.
JA I
The EPRI contractor discussed the purpose of Addendum 1 that described Version 2.0 of the
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EPRI MOV Performance Prediction Methodology (PPM). For example, PPM Version 2.0 incorporates applicable error and information notices related to the modeling software. Further, PPM Version 2.0 corrects a minor error in the fluid algorithm, includes a water inertia effect, allows the use of three significant figures for dimension measurements, and incorporates minor user interface modifications. EPRI assessed PPM Version 2.0 for gate and butterfly valve i
predictions and found less than a 1% change in the prediction ratios between the old and new software. With respect to one Borg-Warner gate valve stroke, EPRI reported that a previously unpredictable result was found to be predictable with a slight under-prediction of required thrust 9909290135 990922'
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i Based on the EPRI presentation, an SE supplement can likely be prepared to address Addendum 1 to the EPRI topical report by the end of 1999. In addition to the topical report addendum, the staff will review the SE dated March 15,1996, for any conditions on the use of the EPRI MOV PPM that might relate to the changes identified in Addendum 1. The staff will notify NEl if a request for additionalinformation is necessary.
With respoct to Addendum 2, the EPRI Thrust Uncertainty Method requires detailed review by the NRC staff to resolve specific challenges in justifying this method. For example, the staff will evaluate the sufficiency of available test data to determine a reliable prediction of the conservatism of the EPRI MOV PPM for all valve types and conditions. Further, the staff will I
consider the adequacy of grouping all gate valves and conditions into only two categories (hot and cold water). The staff will also review the extent of preconditioning of the valves used in calculating the conservatism of the EPRI MOV PPM. The staff discussed the potential use of the EPRI separate effects tests on Stellite friction coefficients in determining the uncertainty of the EPRI MOV PPM. EPRI considered such an approach, but believed that the result would not be sufficiently reliable. The staff will work to complete its review by the spring of 2000. If
]
necessary, the staff will attempt to prepare a request for additional information during i
January 2000.
As future products, EPRI is prepanng additional updates to the EPRI MOV PPM on unwedging, stem friction, and globe valves. These addenda are planned to be completed in 2000.
4 NEl and EPRI stated that the handouts provided at the public meeting are not proprietary.
Attachments: As stated cc w/atts: See next page
- DISTRIBUTION: See attached page Document Name: g:\\pxw\\msum0916.wpd
/f SC:P[p OFFICE PM:RGEB: DRIP EMEB:DE SC: EMEB o M
NAME PWen 9cy/
TSc M h DTerao ewicz DATE 9/otl /99 9 /.2 1 /99 9 / 2.l /99 9Y)$/99 OFFICIAL OFFICE COPY l
Nuclear Energy Institute Project No. 689 cc:
Mr. Ralph Beedle Ms. Lynnette Hendricks, Director Senior Vice President Plant Support and Chief Nuclear Officer
- Nuclear Energy institute Nuclear Energy Institute Suite 400 Suite 400 1776 l Street, NW t
1776 l Street, NW Washington, DC 20006-3708 Washington, DC 20006-3708 I
Mr. Alex Marion, Director Mr. Charles B. Brinkman, Director Programs Washington Operations Nuclear Energy Institute ABB-Combustion Engineering, Inc.
Suite 400 12300 Twinbrook Parkway, Suite 330 1776 i Street, NW Rockville, Maryland 20852 Washington, DC 20006-3708 Mr. David Modeen, Director Mr. H. A. Sepp, Manager Engineering Regulatory and Licensing Engineering 4
Nuclear Energy Institute Westinghouse Electric Company Suite 400 P.O. Box 355 1776 i Street, NW Pittsburgh, Pennsylvania 15230-0355 Washington, DC 20006-3708 Mr. Anthony Pietrangelo, Director Licensing j
Nuclear Energy Institute Suite 400 1776 i Street, NW Washington, DC 20006-3708 Mr. Jim Davis, Director Operations Nuclear Energy Institute Suite 400 1776 i Street, NW Washington, DC 20006-3708
1 l.
34, h<
C. Carpenter j i
that is encompassed by the 5% margin applied to this valve type. EPRI stated that no changes l
were made to the globe valve modelin the EPRI MOV PPM. See Attachment 3.
The EPRI contractor discussed the Thrust Uncertainty Method in Addendum 2 which determines average conservatism in the PPM gate valve thrust prediction, and then treats the conservatism as an uncertainty that is statistically combined with other uncertainties. In L
particular, the method compares the EPRI MOV PPM thrust prediction to the EPRI flow loop test results, and calculates an average prediction ratio for gate valves (except Borg-Warner valves which were excluded) under either cold or hot water conditions. The method uses this average prediction ratio to reduce the EPRI MOV PPM thrust prediction for a specific valve to a nominal thrust prediction.- A thrust prediction uncertainty is then determined from the EPRI MOV PPM thrust prediction and the nominal thrust prediction. The method provides a l.
minimum required thrust at control switch trip based on the nominal thrust prediction combined with random and bias uncertainties, including the thrust prediction uncertainty. EPRI performed a validation effort using 19 strokes from 12 valves in its flow testing program. EPRI believes that the conservatism of its thrust uncertainty method is consistent with the conservatism of the
' EPRI MOV PPM. See Attachment 4.
Based on the EPRI presentation, an SE supplement can likely be prepared to address Addendum 1 to the EPRI topical report by the end of 1999. In addition to the topical report addendum, the staff will review the SE dated March 15,1996, for any conditions on the use of the EPRI MOV PPM that might relate to the changes identified in Addendum 1. The staff will notify NEl if a request for additionalinformation is necessary.
l With respect to Addendum 2, the EPRI Thrust Uncertainty Method requires detailed review by the NRC staff to resolve specific challenges in justifyin0 this method. For example, the staff will evaluate the sufficiency of available test data to determine a reliable prediction of the conservatism of the EPRI MOV PPM for all valve types and conditions. Further, the staff will consider the adequacy of grouping all gate valves and conditions into only two categories (hot and cold water). The staff will also, review the extent of preconditioning of the valves used in calculating the conservatism of the EPRI MOV PPM. The staff discussed the potential use of l
the EPRI separate effects tests on Stellite friction coefficients in determining the uncertainty of the EPRI MOV PPM. EPRI considered such an approach, but believed that the result would not be sufficiently reliable. The staff will work to complete its review by the spring of 2000. If necessary, the staff will attempt to prepare a request for additional information during
-January 2000.
I As future products, EPRI is preparing additional updates to the EPRI MOV PPM on unwedging, stem friction, and globe valves. These addenda are planned to be completed in 2000.
NEl and EPRI stated that the handouts provided at the public meeting are not proprietary.
Attachments: As stated cc w/atts: See next page
NRC/NEl MEETING ON MOV PERFORMANCE PREDICTION METHODOLOGY LIST OF ATTENDEES September 16,1999 NAMEi ORGANIZATION David Terao NRR/DE/EMEB Tom Scarbrough NRR/DE/EMEB Peter Wen NRR/ DRIP /RGEB Jim Riley NEl John Hosfer EPRI Paul Damerell MPR Steven Burns MPR Tom Walker MPR
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J Gate Vdx11nd UnwrtaintyMettrxiFor EPRI MOVPerfornanx PralicHnn Methocblogy (PPM) i l
TomWdker MPR Assoddes,Inc September 16,1999 anun Outline
' IntrodJdion
- Description d Method Agdlotility
- Excrrde
- MethodJusfifloation MethodVdicdion a
Sunrncry 1
I l
l
p p.
l Introduction
- PPMis avdictiedmethodfor peddingthrust ct forcpo recpirements
< Gdevdves
< Gctevdves
< Butterfly vdves
- For gie vdves, thrust peddions cre boundngWth rrcr(in
< Valctility d COF fa Stellite (sed mderld)
< Vdve must be tested Wth DP to deterrrine crtud COF
< Differen betveen PPM peddion cnd crfud thrust regJrementis cnuncerfdnty
...i.
wara Introduction (con't)
- T hrust Uncerfdnty Method (T UM)
< Deterrrines cueroge conservdismin PPM gievdve thrust peddion
< T reds conservdism cs cn uncerfdnty thd is stdisticdly comtined Wth other uncerfdnties (e.g, R OL) wara 2
DescriptionofMethod
- Use PPM to predd boundng recpiredthrust Tpeu i
- CdoJide norrind recpiredihrust Tuay
< Aclust PPM thrust preddicn for pctking and stem rejedian locrt to cbterrrine DP thrust u.nY nant
< Multidy DP thrust conrponent b/ Amrcge Preddion Rdio(APR)
< APR is 0.697 fcr cddwder (less thcn 100F) with floMi up to 50 fthec 0.775 for hd wder (100-550F) with cny ficw rde
< kjust resut for paking cndstern rejedian locri
==
l DescriptionofMethod(con't)
Cdculcte thrust preddion uncerfdnty, U pu t
T Umi = """I~ T" *
- 2 NOM i
Cdculde the rrinimum recpired thrust ct contrd switch trip Tc37 = Tuoy(1+[B +][R + U w) 2 2
vhere B represents tics cndR rcncbrn uncertdnties
.mpa 3
p l
l l
DescriptionofMethod(con't)
- EPRl-reconnmendeddcs mdrcntmunoerfdnties cbe to rde-d-locdng cm be us ed or pant ctta can ca evduded to deternine dcnt-s pedfic vdues l
l 1 www WMPR YYlN
- Gatevdves
< S did crd flalde ve@3, a pt Bcyg Wcrner (PPM scttwcre)
{
< Westinghcuse(EPRI hcndcdculdion)
< Dcude dsk cod spit ve@a, ficwisddion only (E PRI
)
hcrd cdculdlan)
- Must meet PPM cgJlctdlity recpirements
- Casingstrokes
- Cdd water (<100F) Wth ficws upto SO fthec Hot water (uptoS50F) cicny ficwrde 1
wwm WMPR 4
i
r l
Entrple
= Excmpleinputs
< TerTperdure 98F
< PPMthrust peddian 25,000Its
< Pcrkinglocd 2,000Its
< Stem rejedian locd 2,000 its
< ROL tics: 3%
< ROL rcnimuncortdnty: 18%
< T hrust mecs urement uncertdnty (rcndorrQ: 10%
< T cicpe s vdtch repedctility (rcnin ): 5%
i
< T UM peddion rdio: 0.697
,m.,,,,
= men Euxrple(can'i)
= Irrplementdion d T UM:
Tsou = (25000- 2000- 2000) *.697 + 2000 + 2000 = 18,637 lbs Unu=
- 100 = 34.14%
18,637 Tesi = 18637(1+.03 + l.3414
,,3 g2 +.10 +.05 ) = 26,6851bs 2
2 2
w wwm, "MFR 5
(
MethodJustification l
- Use d S RSS to cortdne rcncbrn un rtdntles is a l
ccTu only cwiped czprocch for vdve setup
< Vdues deterrrined for high crdlowterrperduresince S tellite fridicn varies Wth temperdure
< Borg-Waner vdvs exduded becnJse d higf1 sed
)
l fridion - rrethod N/A for B org-Waner vdves
< E PRI flowlocpvdves were "pe-condtioned" plcr to testing so APRs indude the effed d gecondtloning i
n..i.
umm l
MethodValidation
+ VdicbtedagdnstcppilatieEPRI flowtesting
< 10 strokes frorn 12 vdvs
+ T U M Irrpf emented to cbterrrine rrin thrust d CS T T est ctta evduded to chterrrine if vdve vxuld hcue dased vdth torcpe s vAtch s et d rrinimum vdue l
< Stern thrust pdted codnst sging pak dspcnanmt for DP cnd stdictests l
< Mnimumthrust d CST carelded toaspedficsging pcrk dspcrement for stdictest
< T hrust fu DP test d thd sping pcrk dspcoement cbternined cnd compcred to thrust reqJired to dae vdve n....
wum i
l l
6 L
=
?
j MethodVdidrnion(con't) i f
Tcar 4
S'**IC
/ *\\
z Stem Ten
" Margin /
Dynamic Thrust P...
Measured Mmimum torque thrust at IW switch setting h
Spring Pack Displacement u mwi Wurst MedvdVdidation(con't)
S,- - D.no...>
-0.05 0
0.05
- 0. t 0 15 0.2 0 25
.,0000 --
Ihan asunnom am.m.ias.C.S.T.
1
/!
. 000 EJpect. oprenac emmt at man.a
/
Te namous C$T emerg.6784
~ 4000 -
t-J/'
s I
40004 8
. *[
- Staic Stroke DP Stroke 2000 -
+
-[
+
~_
0-2c00 i4 wien**
UmPlt 7
b Met]vdValidation(con't) l Preddion rdio (PR) odwided for ecth stroke a
< RegJred thrust dvidad b/ odctie thrust
< Vdue less thcn 1.0 lrdcries T UM omservdively cdculdes recpiredihrust ct CST i
l I,
i.ie.,
MethodValichtion(can't)
Valve Descriptiori Valve Manufacturer Test Conditione 3* 300e Gate Anchor / Darting 15 tps. 844 water 0.57 0.00 50 fos. 634 water 0.87 0.94 blowdown. 517V weier 0.74 0.02 10* 300# Gaio Nichor/Darkng 15 tos. 484 water 0.52 0.85 10' 900s Gate Anchor /Darkng 15 fps. 824 weter 0.62 0.66 15 fps. 704 water 0 86 0 77 2.5* 1500s Gate Veian 50 tps. 72V water 0.72 0.76 powdown 659*F water 0.76 0.82 6* 9008 Gate Crane 15 fps. 69*F water 0.83 0.70 15 fos. 86V water 0.78 0.82 6* 9000 Gaio Votan 50 fps. 73V water 0.60 0.82 powdown. 524Y water 0.79 0.91 10* 300s Gate Veien 15 tos. 554 water 0.71 0.74 15 fps. 72V weier 0.63 0.47 blowdown,5274 wour 1 05 1.03 12* 150s Gate Walworth 15 tps. 554 water 0.82 0.71 "Y
78 3* 1500e Gate Vesan 50 tps. 62V water 0 71 0 66 se wi.neet WMN 8
p.
~
L.
l MethodVdidaHon(con't)
- Vdicdion resulis
< Methodis boundng fa 15 d 15 coldwder strokes old3 d 4 bd water strokes; prs rcnge from 0.52 to 1.05
< Preddien rdis for 15 d the 19 strokes creIcuer thai the peddien rdics frcrn PPM asessment (shcwn bold in tctie) n T he conservdism in the T UM is sirrilcr to(or rrrre thcn) the cons ervdis m in the PPM gate vdve thrust peddiers n owim wupe 1
MethodValidation(con't)
- Vdici9 ion resuits (can't)
< PR for hd water ticnxtun stroke d Vdve 30 ws 1.05 n Vdve 30 had hi@ sed fridicn (0.53 fcr 550F dosing stroke) n R OL hi@ d trinirnum thrust d contrd switd1 trip vdue(cbout 16%)
n Assetsment PR for this strcke wcs 1.03; therefcre, T UM vdicblion results ce cmsistent with PPM asess ment - the PPM is 3-5% non-conservdive fcr this stroke l
l is awim WMPR l
l 9
l L
7 6.
j
.j.
i Surustay
- TheT UMis asdisfactory peddor d nirirrum recpired thrust d contrd svdtch trip for gie vdves
. Themethodhcs been suooessfully vdictiedcginst EPRI ficwtesting
)
i 1
l
=
1 10
~.
7 t.
C Carpenter l Based on the EPRI presentation, an SE supplement can likely be prepared to address Addendum 1 to the EPRI topical report by the end of 1999. In addition to the topical report addendum, the staff will review the SE dated March 15,1996, for any conditions on the use of the EPRI MOV PPM that might relate to the changes identified in Addendum 1. The staff will notify NEl if a request for additional information is necessary.
With respect to Addendum 2, the EPRI Thrust Uncertainty Method requires detailed review by the NRC staff to resolve specific challenges in justifying this method. For example, the staff will evaluate the sufficiency of available test data to determine a reliable prediction of the conservatism of the EPRI MOV PPM for all valve types and conditions. Further, the staff will consider the adequacy of grouping all gate valves and conditions into only two categories (hot and cold water). The staff will also review the extent of preconditioning of the valves used in calculating the conservatism of the EPRI MOV PPM. The staff discussed the potential use of the EPRI separate effects tests on Stellite friction coefficients in determining the uncertainty of the EPRI MOV PPM. EPRI considered such an approach, but believed that the result would not be sufficiently reliable. The staff will work to complete its review by the spring of 2000. If necessary, the staff will attempt to prepare a request for additional information during January 2000.
As future products, EPRI is preparing additional updates to the EPRI MOV PPM on unwedging, f
~
stem friction, and globe valves. These addenda are planned to be completed in 2000.-
I NEl and EPRI stated that the handouts provided at the public meeting are not proprietary..
Attachments: As stated cc w/atts: See next page DISTRIBUTION: See attached page Document Name: g:\\pxw\\msum0916.wpd
[
SC:h OFFICE -
PM:RGEB: DRIP EMEB:DE -
SC: EMEB u NAME PWen 9cy/
TSc M h DTeraoM Mewicz DATE 9/Af /99 9/ 2 1 i99 9/2.1 /99 9YJ$/99 OFFICIAL OFFICE COPY m
I'.
DISTRIBUTION: MTG. NOTICE W/NEl on MOV PPM DATED k 80kh Hard Cooy I
Central File L,
PUBLIC RGEB r/f l
. PWen TScarbrough EMail SCollins/RZimmerman BSheron WKane DMatthews/SNewberry CCarpenter FAkstulewicz JStrosnider/RWessman E Imbro DTerao JBirmingham LOlshan GTracy, OEDO PMNS OPA
)
l
e
- m I -
DISTRIDUTION: MTG. NOTICE W/NEl on MOV PPM DATED h!dOkk l
Hard Cooy Central File PUBLIC RGEB r/f j
L OGC ACRS PWen TScarbrough EMail
)
SCollins/RZimmerman BSheron
-WKane DMatthews/SNewberry j
CCarpenter FAkstulewicz JStrosnider/RWessman E Imbro DTerao JBirmingham LOlshan GTracy, OEDO PMNS l
OPA l
,