ML12340A430

From kanterella
Jump to navigation Jump to search

Enclosure 2, Presentation Materials Used During the Course of the NRC Audit of General Electric - Hitachi Held on October 24-25, 2012 - Non-Proprietary
ML12340A430
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 11/30/2012
From:
GE-Hitachi Nuclear Energy Americas
To:
Office of Nuclear Reactor Regulation
References
L-MT-12-111, TAC ME3145
Download: ML12340A430 (77)
v • d • e


Text

{{#Wiki_filter:L-MT-12-111 ENCLOSURE 2 PRESENTATION MATERIALS USED DURING THE COURSE OF THE NRC AUDIT OF GENERAL ELECTRIC -HITACHI HELD ON OCTOBER 24- 25, 2012 -NON-PROPRIETARY This Enclosure contains the following presentations developed by General Electric -Hitachi: TRACG Tmin Model and Qualification 19 pages Axial Conduction Controlled Quenching 21 pages TRACG Benchmarking to Stern Flow Oscillation Tests 7 pages Halden Dryout Fuel Behaviour Tests 17 pages Monticello MELLLA+ ATWSI Analysis 8 pages 72 pages follow Non-Proprietary Information -Class I (Public)GE Hitachi Nuclear Energy TRACG TMIN Model and Qualification Charlie Heck 0 HITACHI 1 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACE versus TRACG TMIN Correlation o TRACE uses Groeneveld-Stewart correlation -Not dependent on wall material properties, flow, etc.-Depends only on pressure-Based on Inconel. Under predicts TMIN for Zircaloy-TMIN predicted at ATWS conditions (7 MPa) is -690 K, 782°F or about 130 K, 234 0 F above Tsat (for Inconel assuming no subcooling)

  • TRACG04 uses Shumway correlation

-Includes material property, void, and mass flow dependency -Void dependency data is unpublished and has been challenged as potentially causing TMIN over prediction at low void fractions-GEH Initiated a PRC investigation to determine if the potential non-conservatism in TMIN is reportable. -TMIN predicted at ATWS conditions (7 MPa) is -850K, 1070°F or about 290 K, 522 0 F above Tsat (for Zircaloy assuming 100% voids)* Large difference in TMIN-Tsat margin is very significant -Shumway margin 2.2 times Groeneveld-Stewart margin HITACHI2 C I NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG TMIN References

  • R.W. Shumway, Assessment of"TRAC-BWR Heat Transfer: rmin" , EGG-RST-6781, January 1985.0 11 1]9 TRACG Model LTR, NEDE-32176P, Section 6.6.7 0 HITACHI 3 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Shumway Tmin Correlation in TRACG (from Section 6.6.7 of NEDE-32176P)" Equation (6.6-52)Triti = Ta +3.7 pe +Pv h ' 1 (- ))j+151- e)AP CP, Pr, (+ P ) ( / 3112~~PC-ftpkwCp,w

  • Shumway correlation based on pressures from 0.4 to 9 MPa and Reynolds numbers from 0.1e5 to 6.7e5." Shumway correlation predicts the stainless steel data with a mean error of [[ ]] and a standard deviation of [[ I].H4 HITACHI .NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Shumway Correlation versus Data 1000 800 C 0 0*6oo 400 -F 0 2 3 4 5 6 7 8 Reynolds Number

  • 1OAS 0 HITACHI 5 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Shumway Dependence on Material 1800 1600-Shumway (SS, P=O..1400 Shumway (SS, P=6.1200 -Shumway (Zr, P=8.9 7.. Shumway (Zr)2, Pa 1000 800 600 C 4)400F 0 1 HITACHI 2 3 4 5 6 7 8 Reynolds Number

  • 105 6 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Shumway Correlation: Bias & Uncertainty [[I 8]* 81 usable points digitized from Figure 23 in EGG-RST-6781

  • [[1]" Statistics are for entire range of 0.1e5 < Re < 6.7e5" Data is all for stainless steel* Tmin is higher for zircalloy than for stainless" Tmin is much higher for zircalloy with oxide 0 HITACHI 7 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)ATWSI Calculated PCT and Tmin[1 0 HITACHI 8 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)ATWSi Background

  • Current ATWSI basis is BWROG NEDO-32047-A and NEDE-33006P-A for MELLLA+* Both generic evaluations predict high PCT temperatures (over 2200 0 F, 1477 K)* High PCTs were accepted in the NEDO-32047-A SER on the basis that: "...it is unlikely that this damage will distort the core significantly to impede core cooling or prevent safe shutdown." and acceptable radiological consequences

-EPGs changes to require prompt water level reduction to about 1 m below the feedwater sparger" NEDE-33006P-A SER reaches a similar conclusion S 9 HITACHI NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG Benchmarking to GNF2 Flow Oscillation CPR Tests* Stern lab flow oscillation tests used to demonstrate transient applicability of GEXL in predicting BT onset (NEDE-33147P R3, DSSCD, RAI-14)" Additional TRACG benchmarking sensitivity -"TRACG No Quench, Void Effect Included" -TRACG axial conduction quench model is off and Shumway correlation is used with void effect -Same as DSSCD, RAI-14 cases-"TRACG Quench, No Void"- TRACG axial conduction quench model is on, Modified Shumway used (no void effect)Note: BT occurs at the top spacer where void fraction is >90% so removing void credit from Shumway has little effect)H C 10 HITACHI NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Backup 0 HITACHI 11 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TMIN Impact on LOCA Qual. Results[[I]0 HITACHI 12 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TMIN Impact on LOCA Qual. Results[[I]0 HITACHI 13 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TMIN Impact on LOCA Qual. Results I]0 HITACHI 14 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Comments on G-S Tmin Application Extracted from TRACE V5.0 Theory manual Importance of material property (pp. 296, 300-301)Page 296: "At higher pressures (perhaps as low as 2-3 bar for water), the governing process appears to switch to that of the maximum liquid superheat condition. Basically, this states that for liquid-wall contact to occur the wall temperature must be low enough that the liquid will not exceed its maximum superheat value, that is the liquid temperature must remain below that at which homogeneous nucleation would occur. When transient conduction effects are considered, in effect taking the instantaneous "contact temperature" to be equal to the homogeneous nucleation temperature, then material property effects can be included and are substantial for a surface with a sufficiently thick coating of a low conductivity material such as zircaloy dioxide." Page 300: "Some fraction of this 230 K under-prediction is probably due to surface property effects as the FLECHT-SEASET rods are clad with stainless steel that will oxidize more heavily than Inconel rods. However, the majority..." Page 301: "The one significant deficiency of this correlations is that is applies to Inconel only and does not predict the effect of low conductivity oxide layers on Tmi. For example, Dhir et al. (Ref. 6-56) report that for zircaloy rods the quench temperature increases as the rods become oxidized to about 50-80 K higher than the value for fresh rods.... "Future efforts will be directed towards the inclusion of material property effects." Importance of subcooling at high pressure Figure 6-15-Estimate from figure 2.8 K increase in Tmin per 1 K subcooling -Also see Equations (6-129) and (6-130)HITACHI15 HITACHI NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Comments on G-S Tmin Application Extracted from TRACE V5.0 Theory manual* Importance of interaction with quench conditions (pp. 299-301)Page 299: "... it is expected that the observed value of the quench temperature would be somewhat in excess Of Tmin" Page 300: "... it is clear that the value of T from the Groeneveld-Stewart correlation consistently under-predicts the high-pressure quench data by 26 to 70 degrees K""Based on the consistent under-prediction of the quench temperature by the correlation of Groeneveld-Stewart as indicated in Figure 6-16, further investigation is warranted.""For the thermocouple trace in Figure 6-17, the inferred quench temperature is about 800 whereas the Groeneveld-Stewart correlation gives a value of only 570 K. Some fraction of this 230 K under-prediction is probably due to surface property effects as the FLECHT-SEASET rods are clad with stainless steel that will oxidize more heavily than Inconel rods. However, the majority of the discrepancy is probably due to differences between the "spontaneous film collapse" mechanism upon which the Groeneveld-Stewart correlation is based and what occurs at the location of a quench front. Therefore, a modification to the value of Tmin in the vicinity of a quench front is made in TRACE to improve its performance for the prediction of reflood tests." Page 301: "For the THTF tests, a total of 539 data points were collected with a much narrower spread of quench temperatures with the distribution having a mean value of 752 K and a standard deviation of 23 K.Consequently, in the TRACE code, the value of Tmin is set to the maximum of that given by the Groeneveld-Stewart correlation and a value of 725 K for the region within 15 cm of a quench front.HITACHI16 HITACHI NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Comments on G-S Tmin Application Extracted from TRACE V5.0 Theory manual Overall assessment of Groeneveld-Stewart correlation (p. 301)For the present, the Groeneveld-Stewart correlation should be viewed as giving a reasonable but conservative estimate of Tmin.0 HITACHI 17 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Other Comments on TRACE Tmin Transcripts ACRS, T/H Subcommittee: "Peer Review of the TRACE Code", July 7, 2008, pp. 169 (in reference to Groeneveld-Stewart correlation of Tmin)MR. KELLY: Exactly. And so because at the time we weren't able to spend the time to come up with something that was better for things like Zurk oxide, we went ahead and took the conservative approach. And I'm pretty sure I noted that.MR. GRIFFITH: Okay.MR. KELLY: But you're right, that's something that we should look at in the future because it is a built-in conservatism in the code. HIT NRC TRACG TMIN and Quenching Methodology Audit October 24-25. 2012 Non-Proprietary Information -Class I (Public)Other Comments on TRACE Tmin G. Yadigaroglu presentation to ACRS, T/H Subcommittee: "Peer Review of the TRACE Code", July 7, 2008, slide 20 (in reference to "particular issues" and"most important problems" related to TCHF and Tmin implementation in TRACE)* "Belief in the (T Tmin) representation ignoring the progression of the QF as the controlling mechanism"* "Ignoring lots of previous work and starting from scratch with questionable results"* "Minimum Film Boiling Temperature: Difference between quench temperature and rewetting (knee) temperature in reflooding 'mistreated' (old beliefs remain). Object to the implemented 'modification in the vicinity of the quench front to improve ... performance'. HITACHI NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)GE Hitachi Nuclear Energy Axial Conduction Controlled Quenching TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Jens Andersen Chief Consulting Engineer, Thermal Hydraulics HITACHI Non-Proprietary Information -Class I (Public)Quench Front Model The quenching model was developed in support of LOCA applications

  • SAFER Model for Evaluation of Loss-of-Coolant Accidents for Jet Pump and Non-Jet Pump Plants, NEDE-30996P-A, October 1987.S1 D and 2D solution to the axial conduction controlled quench front propagation.

PUL ROD 1 D Solution Pe=Bi= hqdw kw E=J(T, -Tsat)(TX -To)O -Tsat Pe = UqPwCwdw kw Y Quench Front Velocity: Uq* 2D solution Pe = 0.74 Bi 01.9 hq and To-Tsat determined as empirically to give best fit to measured quench front velocities uq Tsa TO SUR!AME TBiP!RATUR

  • HITACHI Figure 5-11. Physical Phenomena in Rewetting TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 2 Non-Proprietary Information

-Class I (Public)References

  • A. Yamanouchi, "Effect of Core Spray in Transient State after Loss of Coolant Accident', Journal of Nuclear Science and Technology, 1968.* R. B. Duffey and D. T. C. Porthouse, "The Physics of Rewetting in water Reactor Emergency Core Cooling", Nuclear Engineering and Design, 1973.T. S. Thompson, "On the Process of rewetting a Hot Surface by a Falling Liquid Film", Nuclear Engineering and Design 1974.* C. L. Tien and L. S. Yao, "Two-Dimensional Conduction-Controlled Rewetting of a Vertical Surface", ASME Winter Annual Meeting, 1974.* K. H. Sun, G. E. Dix and C. L. Tien, "Effect of Precursory Cooling on Falling-Film Rewetting", Journal of Heat Transfer", 1975." R. T. Lahey and F. J. Moody, "The Thermal-Hydraulics of a Boiling Water Nuclear Reactor", ANS, 1977.* "SAFER Model for Evaluation of Loss-of-Coolant Accidents for Jet Pump and Non-Jet Pump Plants", NEDE-30996P-A, 1987.HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 3 Non-Proprietary Information

-Class I (Public)Quench Front Model 103 0 NEDE-30996P-A

  • Top down quenching by falling film.102* Best fit to data: Pe -°.TO hq= Tsat + 65 K= 1.14 MW/m 2-K 10 1.0 0.1 L.0.1 HITACHI BiE-1.8 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 4 Non-Proprietary Information

-Class I (Public)Quench Front Model -TRACG Implementation Implementation based on C. L. Tien's formulation C. L. Tien and L. S. Yao, "Two-Dimensional Conduction-Controlled Rewetting of a Vertical Surface", ASME Winter Annual Meeting, 1974.BiBi Pe=(Bi (1+0.4 -i-))'-5 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 5 Non-Proprietary Information -Class I (Public)Quench Front Model -Qualification Core Spray Heat Transfer Tests SS heater rods 1[* HITACHI I]TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 6 Non-Proprietary Information -Class I (Public)Quench Front Model -Qualification Most test were terminated after PCT was obtained and prior to quenching I]HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 7 Non-Proprietary Information -Class I (Public)Quench Front Model -Qualification 0 Some test were conducted past quenching]]* HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 8 Non-Proprietary Information -Class I (Public)Quench Front Model -Qualification Some test were conducted past quenching[[l I]1]" Groeneveld-Stewart" Fauske" Shumway 561 K 577 K 546 K 0 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 9 I Non-Proprietary Information -Class I (Public)mplementation in TRACG Ix Heat removal in quench front* Axial conduction T = T. for large x Qquench dupc(Tc -Tsat)= kPe(Tc -Tsat)Adiabatic Boundary* Heat transfer to film 0 Qquench f f {h(T -Tsat )}dx--Go=kPe(T. - 0 T=To It (=0 u = quench front velocity Lagrangian coordinate system moving with the quench front T = Tsat* HITACHI T = Tsat for large negative x TRACG TMIN and Quenching Methodology Audit October 24-25. 2012 JGMA 10 Non-Proprietary Information -Class I (Public)Implementation in TRACG continued Energy balance for nodes[[I]0 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 11 Non-Proprietary Information -Class I (Public)Quench Front Model -Summary* Axial conduction controlled quench front propagation model based on analytical/numerical solution]]* Qualification to core spray heat transfer tests.* Fuel rod quenching well predicted* []]0 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 12 Non-Proprietary Information -Class I (Public)Backup* HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 13 Phenomenon an-Proprietary Information -ClsIxl (Public)Heat Conduction Equation T = T. for large x Adiabatic Boundary 0 X>0: di a 2 T=dk7T +Lim T = T, X-4o0 OT dupc -O ax T = To for x=O Steady state solution 0 0 T u = quench front velocity Lagrangian coordinate system moving with the quench front= a2T OT=dk--2 +dupc -h(T-T Ox ax sat)Lim T = Tsat X-->-oo OT and -- continuous ax T = Tsat X=O: T =TO 0 HITACHI T = Tsat for large negative x TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 14 Non-Proprietary Information -Class I (Public)Phenomenon -Basic Equations Normalized Equations x d a 2 y dupc oy 0 az2 k Oz Limy = y Z Y+00 =0 To -T sat T-Tsat Y=TO -Tsat Pe =dupc k a 2 Y+ dupc ay k az hd k Limy=O Z_---oo_ hd Bi=--z=O: y=1 and -continuous az TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 15* HITACHI Non-Proprietary Information -Class I (Public)Phenomenon -Solution Basic Equations Solution z>O: az 2 aZ 2 az 2+Pe-y =0 az+Pea Y-Biy =0 az a 2 + Pea =0 a=-Pe y =c 1 + c 2 e-Pez a 2+Pea -Bi=0 Ordinary linear differential equations Pe 2 y = ce az Pe (Pee 2 22 y =C 3 e Note 0 HITACHI Limy =0 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 16 Non-Proprietary Information -Class I (Public)Phenomenon -Solution cont.Solution*Pe 2-LT +Bi)z Z < 0: y(O)=1 =>y=e 2 ~2)2+Bi = 2(Yoo -z>0:Too-Tsat Z >0: Limy = Y =TT Z-40 To -sat e2) +Bi = (y2 -y.o + )Pe 2 y = Y. +(l-y.)e-Pez Continuous slope at z=0 Pe I_/2e + + Bi) = (Yoo -1)Pe Pe =VYc -(Yo. -1)P e = [Ei j(Cj, ~Tat)(T. T 0 0 HITACHI Yamanouchi's 1 D solution TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 17 Non-Proprietary Information -Class I (Public)Example Typical of ATWSI I]0 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 18 Non-Proprietary Information -Class I (Public)Typical Quench Front Temperature Profile 1 mm From T. S. Thompson 2D solution Back side ---0~6*0* 0%t~kt A I '.*JIl I PI -11V II~ I N;K. 31 IJ-) :"A .4ý

  • I W~ *I i tIM ON THE PROCESS OF RF14[ITING A HOT SURF.%WE OVYA-FAL ;N LW~II) MW~l WA R.,TK~~'0 a 0 13 (0J OM RUMS A A a a 100 I b. U 0 0 0 0 0l 0 X 0 I 00 0 000 X 0 0 X X 0 x X x x X Surface Containing, quench front I i I i i I .I a I I I i a I-120 -105-614 0 0 2 -12 0 12 24 X4 0D STNU IX F04110NZ -1i 103 4.71.5 *35.8 al 0-354.THIN --s* HITACHI Fe. 3. ~wid Wmpe, worn.m. AERF -R5s4,.n a 5534,.., whre T, =41 504, It/r,R,, 0 .ots2, Tc -9)"i, P 300 pa,8 -0 S64 in., P- 4%4 lbmfts, ca 0.1 2 1/ibm 0, R'i OS i., &d k -0.68 W A ItoF.TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 19 Non-Proprietary Information

-Class I (Public)DISCUSSION ON QUENCH MODELS FOR BEST EsrIMATE CODES Yo"lo MURAO, Jlapan Anwmick Ener Research lhuzft Tokai-mura, lbaraki-ken, lapmn, 319-11 Tckpbone: 81-292-82-5272 mad Fax: 81-292-82-5276 HL DISCUSSION

1. Uneewtall" of boilug vrvm ft is mnmmd daw do "bofial caiw of de quech phomwmen con be 1murmmAd schemhleiy in Ft. I Iand he maximum he flux *," cofufespo so dth heci flux L .* 4.0 x 10 (1 --u swumpiok is bm s on e ults of JrR nmfood expaim ", the b6 $w b cuave colaied ftm the umperaw hisories of cld sumfas dwgv onilood phase have a Iam peut sAur qwme point. Dees. at the dam avera&. h cakluled hou flx Is lbum tdon de rMe hows flu&"I g&~N 467 caft les:gt. 'I ros 'F se psWla Tie 341 41 a .1 etwf" O"I.40 An A"41 A An 2. Umitltisoe of te 0imeadnleal, Wall euduedlem As poiated ams by Disk, ther isa singiur pon in mv. mos d iondm caloosiadume sad *he ditoams ad lhe-eo betwsen appearom of fte damisma m p dwoVat 6qenchig fto onbe AAd4M ad reepectiv*l Amis the oes-dkieesloal seaseotls a m suand d0 nfleconds espoclv lb neai at umparaw chwp. 01 i"os b spes mash sie ad 10 mlinbecoods in t*e te a*a son l bW Ie Pom s the MI" llCUs
  • Is.Fi& 12 Elfa of wail ddelmuon; on awelg aM-tesl c s! cMs -pamw -(rOake hm. Ro(1)effm of thema ONequeacw velociy I obvivlc is do clmlaw as ow kh fL 12, whle w efet on qusc velocity Is h aWalysh This muas tW th thoe ond" spae ame is soi sod moug Is Thompsons callatkam By appliutlos of a mwvhg mesh sceme or Iha canddco cdoohlos6 eves & vesy dus axia spes mesh con be made without signiflowdy w~inceal the covoiatlo dows Vesy 6e rasla mesh mats *Ae comqiatiag due olgeflosely hip TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 20 t is lm Iwo- *,.aatm , calce , TU mpsn sed VM -/ -M HITACHI---cu. m- uI Non-Proprietary Information

-Class I (Public)Conclusion" Fine mesh calculation of axial conduction controlled quenching requires node sizes of 0.01 -0.1 mm* Heat transfer to liquid upstream of the quench front due to axial conduction takes place over a few mm.0 HITACHI TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 JGMA 21 Non-Proprietary Information -Class I (Public)GE Hitachi Nuclear Energy TRACG Benchmarking to Stern Flow Oscillation Tests Maria Pfeffer Michael Cook HITACHI Non-Proprietary Information -Class I (Public)TRACG Benchmarking to GNF2 Flow Oscillation CPR Tests" Stern lab flow oscillation tests used to demonstrate transient applicability of GEXL'in predicting BT onse (NEDE-33147P R3, DSSCD, RAI-14" Additional TRACG benchmarking sensitivity t-"TRACG No Quench, Void Effect Included" -TRACG axial conduction quench model is off and Shumway correlation is used with void effect -Same as DSSCD, RAI-14 cases-"TRACG Quench, No Void" -TRACG axial conduction quench model is on, Modified Shumway used (no void effect)Note: BT occurs at the top spacer where void fraction is >90% so removing void credit from Shumway has little effect)0 HITACHI 2 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Benchmarking Sensitivity Results, Test 952[[* HITACHI I]3 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)UNVERIFIED Benchmarking Sensitivity Results, Test 952 I]0 HITACHI 4 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Benchmarking Sensitivity Results, Test 2469[[]]0 HITACHI 5 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)UNVERIFIED Benchmarking Sensitivity Results, Test 2469 I]0 HITACHI 6 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Conclusions

  • Benchmarking results show good agreement.
  • [1]* Modified Shumway (without void effect) is adequate for ATWS applications." Axial conduction quench model reduces sensitivity to TMIN.0 HITACHI 7 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)GE Hitachi Nuclear Energy Halden Dryout Fuel Behaviour Tests Jens Andersen Pradip Saha Craig Goodson HITACHI Non-Proprietary Information -Class I (Public)Halden Dryout Fuel Behavior Tests I HWR4SZ OECD HALEKINI REACTOR PROJECT Performed in the Halden BWR 6 I irnin SwmfWinm¶OAwUfTS sin K *4w)Wýa-*ý..-4,l Hl"Pfoot V.. O*tkt -4 0 HITACHI 2 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Halden Reactor* Boiling water reactor Heavy water moderation

  • Thermal Power -up to 18.2MW* Operating pressure -up to 7.3 MPa I]0 HITACHI 3 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Test Loop -Third Test Series[[I]Similar to flow reduction during an ATWSI event, boiling transition and subsequent rewet when flow is reestablished. I]0 HITACHI 4 NRC TRACG TMIN and Quenching Methodology Audit October 24-2 5. 2012 Non-Proprietary Information -Class I (Public)Test Section -Third Test Series 0 HITACHI I]5 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Test Section Detail- Third Test Series[R I]0 HITACHI 6 NRC TRACG THIN and Quenching Methodology Audit October 24-25. 2012 Non-Proprietary Information -Class I (Public)Dryout Experiments -Third Test Series I]0 HITACHI 7 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Test Results -Third Tests Series I]0 HITACHI 8 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Test Results -Third Test Series -Experiment 4 0]]0 HITACHI I]9 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG Model of Experiment 4 0 HITACHI]]10 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG Results of Experiment 4 -UNVERIFIED ]]" TRACG Axial Conduction Controlled Quench Model is used* TRACG can simulate Halden Experiment 4 successfully. a HITACHI 11 NRC TRACG TMIN and Quenching Methodology Audit October 24-25. 2012 Non-Proprietary Information -Class I (Public)TRACG Results with Quench Model -UNVERIFIED I]Modified Shumway is the Shumway Correlation without the Void Fraction Component TRACG model shows quenching similar to test data [[* HITACHI 1]12 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG Results with no Quench Model -UNVERIFIED [[I][1 I]0 HITACHI 13 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)TRACG Results of Experiment 4 -UNVERIFIED. Void Fraction I]HITACHI 14 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Summary* Identified a few Halden dryout experiments suitable for TRACG qualification of PCT during ATWSI.* Experiment

  1. 4 has been simulated with various TRACG model assumptions.
  • TRACG with axial conduction controlled quench predicts the PCT and quench time well. [[model I]0 HITACHI 15 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Back up (TC attachment) I]0 HITACHI 16 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Typical ATWSI vs. Halden Expt. 4 Condition (Just before and after quench)[[I]0 HITACHI 17 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)GE Hitachi Nuclear Energy Monticello MELLLA+ATWSI Analysis Michael Cook 0 HITACHI 1 NRC TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Monticello ATWSI Analysis Overview 9 Two ATWSI Scenarios Evaluated-Turbine Trip with Bypass (TTWBP) -Limiting-Recirculation Pump Trip (RPT)* Limiting Initial-[[Conditions 1]* TRACG04 0 HITACHI 2 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Significant Assumptions" Significant Conservatisms

  • Quench and TMIN Settings-[[I]0 HITACHI 3 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information

-Class I (Public)Results I]0 HITACHI 4 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Results -Continued[[I]0 HITACHI 5 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Monticello Evaluation of the Shumway Void Effect (PRC 12-07)I]0 HITACHI 6 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Monticello Evaluation of the Shumway Void Effect Results[[]]Overall Conclusion -The identified potential non-conservatism is not reportable 0 HITACHI 7 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 Non-Proprietary Information -Class I (Public)Questions 0 HITACHI 8 TRACG TMIN and Quenching Methodology Audit October 24-25, 2012 L-MT-12-111 ENCLOSURE 3 GENERAL ELECTRIC -HITACHI AFFIDAVIT FOR WITHHOLDING PROPRIETARY INFORMATION 3 pages follow GE-Hitachi Nuclear Energy Ameriicas LLC AFFIDAVIT I, Edward D. Schrull, PE state as follows: (1) I am the Vice President, Regulatory Affairs, Services Licensing, GE-Hitachi Nuclear Energy Americas LLC ("GEH"), and have been delegated the function of reviewing the information described in paragraph (2) which is sought to be withheld, and have been authorized to apply for its withholding. (2) The information sought to be withheld is contained in Enclosure I of GEH letter GE-MNGP-AEP-321 1, L King (GEH) to J Bjorseth (NSPM), "Presentations from the NRC Audit of Monticello MELLLA+ ATWS/I, October 24th and 25th, dated October 30, 2012.GEH proprietary text is identified by dark red text inside double square brackets. Thi-s sentence is an example...' Figures and large objects containing proprietary information are identified with double square brackets before and after the object. In each case, the superscript notation {3J refers to Paragraph (3) of this affidavit, which provides the basis for the proprietary determination. (3) In making this application for withholding of proprietary information of which it is the owner or licensee, GEH relies upon the exemption from disclosure set forth in the Freedom of Information Act ("FOIA"),. 5 USC Sec. 552(b)(4), and the Trade Secrets Act, 18 USC Sec. 1905, and NRC regulations 10 CFR 9.17(a)(4), and 2.390(a)(4) for "trade secrets" (Exemption 4). The material for which exemption from disclosure is here sought also qualify under the narrower definition of "trade secret", within the meanings assigned to those terms for purposes of FOIA Exemption 4 in, respectively, Critical Mass Energy Project v. Nuclear Regulatory Commission. 975F2d871 (DC Cir. 1992), and Public Citizen Health Research Group v. FDA, 704F2d 1280 (DC Cir. 1983).(4) Some examples of categories of information which fit into the definition of proprietary information are: a. Information that discloses a process, method, or apparatus, including supporting data and analyses, where prevention of its use by GEH's competitors without license from GEH constitutes a competitive economic advantage over other companies;

b. Information which, if used by a competitor, would reduce his expenditure of resources or improve his competitive position in the design, manufacture, shipment, installation, assurance of quality, or licensing of a similar product;c. Information which reveals aspects of past, present, or future GEH customer-funded development plans and programs, resulting in potential products to GEH;GE-MNGP-AEP-3211 Enclosure 1 Affidavit Page I of 3
d. Information which discloses patentable subject matter for which it may be desirable to obtain patent protection.

The information sought to be withheld is considered to be proprietary for the reasons set forth in paragraphs (4)a. and (4)b. above.(5) To address 10 CFR 2.390(b)(4), the information sought to be withheld is being submitted to NRC in confidence. The information is of a sort customarily held in confidence by GEH, and is in fact so held. The information sought to be withheld has, to the best of my knowledge and belief, consistently been held in confidence by GEH, no public disclosure has been made, and it is not available in public sources. All disclosures to third parties, including any required transmittals to NRC, have been made, or must be made, pursuant to regulatory provisions or proprietary agreements which provide for maintenance of the information in confidence. Its initial designation as proprietary information, and the subsequent steps taken to prevent its unauthorized disclosure, are as set forth in paragraphs (6) and (7) following. (6) Initial approval of proprietary treatment of a document is made by the manager of the originating component, the person most likely to be acquainted with the value and sensitivity of the information in relation to industry knowledge, or subject to the terms under which it was licensed to GEH. Access to such documents within GEH is limited on a"need to know" basis.(7) The procedure for approval of external release of such a document typically requires review by the staff manager, project manager, principal scientist, or other equivalent authority for technical content, competitive effect, and determination of the accuracy of the proprietary designation. Disclosures outside GEH are limited to regulatory bodies, customers, and potential customers, and their agents, suppliers, and licensees, and others with a legitimate need for the information, and then only in accordance with appropriate regulatory provisions or proprietary agreements. (8) The information identified in paragraph (2) is classified as proprietary because it contains a detailed description, including the process and methodology, for application of TRACG to the performance of evaluations for BWRs. The development, reporting, evaluation and interpretations of the results, as they relate to the BWR was achieved at a significant cost to GEH or its licensor.The development of this methodology, along with the testing, development and approval of the methodology is derived from an extensive experience database that constitutes a major asset of GEH or its licensor.GE-MNGP-AEP-3211 Enclosure 1 Affidavit Page 2 of 3 (9) Public disclosure of the information sought to be withheld is likely to cause substantial harm to GEIHs competitive position and foreclose or reduce the availability of profit-making opportunities. The information is part of GEIHs comprehensive BWR safety and technology base, and its commercial value extends beyond the original development cost.The value of the technology base goes beyond the extensive physical database and analytical methodology and includes development of the expertise to determine and apply the appropriate evaluation process. In addition, the technology base includes the value derived from providing analyses done with NRC-approved methods.The research, development, engineering, analytical and NRC review costs comprise a substantial investment of time and money by GEH.The precise value of the expertise to devise an evaluation process and apply the correct analytical methodology is difficult to quantify, but it clearly is substantial. GEITs competitive advantage will be lost if its competitors are able to use the results of the GEH experience to normalize or verify their own process or if they are able to claim an equivalent understanding by demonstrating that they can arrive at the same or similar conclusions. The value of this information to GEH would be lost if the information were disclosed to the public. Making such information available to competitors without their having been required to undertake a similar expenditure of resources would unfairly provide competitors with a windfall, and deprive GEH of the opportunity to exercise its competitive advantage to seek an adequate return on its large investment in developing and obtaining these very valuable analytical tools.I declare under penalty of perjury that the foregoing affidavit and the matters stated therein are true and correct to the best of my knowledge, information, and belief.Executed on this 3 0& day of October 2012.Edward D. Schrull Vice President, Regulatory Affairs Services Licensing GE-Hitachi Nuclear Energy Americas LLC 3901 Castle Hayne Road Wilmington, NC 28401 GE-MNGP-AEP-3211 Enclosure 1 Affidavit Page 3 of 3}}

Retrieved from "https://kanterella.com/w/index.php?title=ML12340A430&oldid=909276"