ML20148D621

Requests That Response to NRC RAI Re AP600 Be Withheld from Public Disclosure,Per 10CFR2.790.Nonproprietary Responses Encl

ML20148D621
Person / Time
Site:	05200003
Issue date:	05/23/1997
From:	Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19317C307	List: ML20148D621 NSD-NRC-97-5149, Forwards Proprietary & non-proprietary Responses to RAI 440.339 on Notrump Nodalization Studies Re AP600.Proprietary Response Withheld,Per 10CFR2.790
References
AW-97-1114, NUDOCS 9706020028
Download: ML20148D621 (108)

Text

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Electric Corporation Pittsburgh Pennsylvama 15230 0355 AW-97-1114 May 23,1997 Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 ATTENTION:

MR. T. R. QUAY APPLICATION FOR WITilHOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLOSURE

SUBJECT:

WESTINGilOUSE RESPONSES TO NRC REQUESTS FOR ADDITIONAL INFORMATION ON TIIE AP600

Dear Mr. Quay:

The application for withholding is submitted by Westinghouse Electric Corporation (" Westinghouse")

pursuant to the provisions of paragraph (b)(1) of Section 2.790 of the Conunission's regulations. It contains commercial strategic information proprietary to Westinghouse and customarily held in confidence.

The proprietary material for which withholding is being requested is identified in the proprietary version of the subject report. In conformance with 10CFR Section 2.790, Affidavit AW-97-1114 accompanies this application for withholding setting forth the basis on which the identified proprietary information may be withheld from public disclosure.

Accordingly, it is respectfully requested that the subject information which is proprietary to Westinghouse be withheld from public disclosure in accordance with 10CFR Section 2.790 of the Commission's regulations.

Correspondence with respect to this application for withholding or the accompanying affidavit should reference AW-97-1114 and should be addressed to the undersigned.

Very truly yours, J -s, l

Brian A. McIntyre, Manager l

Advanced Plant Safety and Licensing jml cc:

Kevin Bohrer NRC OWFN - MS 12E20 1

9706020028 970523 PDR ADOCK 05200003 A

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AFFIDAVIT i

COMMONWEALTil OF PENNSYLVANIA:

ss COUNTY OF ALLEG11ENY:

Before me, the undersigned authority, personally appeared Brian A. McIntyre, who, being by me duly sworn according to law, deposes and says that he is authorized to execute this Affidavit on

' behalf of Westinghouse Electric Corporation (" Westinghouse") and that the averments of fact set forth in this Affidavit are true and correct to the best of his knowledge, information, and belief:

k Brian A. McIntyre, Manager Advanced Plant Safety and Licensing Sworn to and subscribed before me this A7s1 day of be

,1997

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Notary Pubh,c 4

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AW-97-Ill4 i

(1)

I am Manager, Advanced Plant Safety And Licensing, in the Advanced Technology Business Area, of the Westinghouse Electric Corporation and as such, I have been specifically delegated the function of reviewing the proprietary information sought to be withheld from

(

public disclosure in connection with uclear power plant licensing and rulemaking proceedings, and am authorized to apply for its withholding on behalf of the Westinghouse l

Energy Systems Business Unit.

(2)

I am making this Affidavit in conformance with the provisions of 10CFR Section 2.790 of the Commission's regulations and in conjunction with the Westinghouse application for withholding accompanying this Affidavit.

(3)

I have personal knowledge of the criteria and procedures utilized by the Westinghouse Energy Systems Business Unit in designating information as a trade secret, privileged or as confidential commercial or financial information.

(4)

Pursuant to the provisions of paragraph (b)(4) of Section 2.790 of the Commission's regulations, the following is furnished for consideration by the Commission in determining whether the information sought to be withheld from public disclosure should be withheld.

(i)

The information sought to be withheld from public disclosure is owned and has been held in confidence by Westinghouse.

l (ii)

The information is of a type customarily held in confidence by Westinghouse and not l

customarily disclosed to the public. Westinghouse has a rational basis for determining the types of information customarily held in confidence by it and, in that connection, utilizes a system to detennine when and whether to hold certain types of information I

in confidence. The application of that system and the substance of that system i

constitutes Westinghouse policy and provides the rational basis required, i

Under that system, information is held in confidence if it falls in one or more of several types, the release of which might result in the loss of an existing or potential competitive advantage, as follows:

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I AW-97-1114

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L

-(a)

The informatien reveals the distinguishing aspects of a process (or component, l

l structure, tool, method, etc ) where prevention of its use by any of Westinghouse's competnors without license from Westinghouse constitutes a competitive economic advantage over other companies, j

1 (b)

It consists of supporting data, including test data, relative to a process (or component, structure, tool, method, etc.), the application of which data l

secures a competitive economic advantage, e.g., by optimization or improved marketability.

(c)

Its use 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 a similar product.

l (d)

It reveals cost or price information. production capacities, budget levels, or commercial strategies of Westinghouse, its customers or suppliers.

(e)

It reveals aspects of past, present, or future Westinghouse or customer funded l

development plans and programs of potential commercial value to Westinghouse.

(f)

It contains patentable ideas, for which patent protection may be desirable.

l There are sound policy reasons behind the Westinghouse system which include the following:

l (a)

The use of such information by Westinghouse gives Westinghouse a competitive advantage over its competitors. It is, therefore, withheld from disclosure to protect the Westinghouse competitive position.

(b)

It is information which is marketable in many ways. The extent to which such s

l infonnation is available to competitors diminishes the Westinghouse ability to l

l sell products and services involving the use of the information.

l f

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AW-97-Il14 r

1 (c)

Use by our competitor would put Westinghouse at a competitive disadvantage by reducing his l

expenditure of resources at our expense.

(d)

Each component of proprietary information pertinent to a particular competitive advantage is potentially as valuable as the total competitive advantage. If competitors acquire components of proprietary information, any one component may be the key to the entire puzzle, thereby depriving Westinghouse of a competitive advantage.

(e)

Unrestricted disclosure would jeopardize the position of prominence of Westinghouse in the world market, and thereby give a market advantage to the competition of those countries.

(f)

The Westinghouse capacity to invest corporate assets in research and development depends upon the success in obtaining and maintaining a competitive advantage.

(iii)

The information is being transmitted to the Commission in confidence and, under the provisions of 10CFR Section 2.790, it is to be received in confidence by the Commission.

I (iv)

The information sought to be protected is not available in public sources or available information has not been previously employed in the same original manner or method to the best of our knowledge and belief.

(v)

Enclosed is Letter NSD-NRC-97-5149, May 23,1997 being transmitted by Westinghouse Electric Corporation (W) letter and Application for Withholding Proprietary Information from Public Disclosure, Brian A. McIntyre (}V), to l

Mr. T. R. Quay, Office of NRR. The proprietary information as submitted for use by Westinghouse Electric Corporation is in response to questions concerning the AP600 plant and the associated design certification application and is expected to be applicable in other licensee submittals in response to certain NRC requirements for

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AW-97-1114 justification of licensing advanced nuclear power plant designs.

This information is part of that which will enable Westinghouse to:

(a)

Demonstrate the design and safety of the AP600 Passive Safety Systems.

(b)

Establish applicable verification testing methods.

1 (c)

Design Advanced Nuclear Power Plants that meet NRC requirements.

(d)

Establish technical and licensing approaches for the AP600 that will ultimately result in a certified design.

(e)

Assist customers in obtaining NRC approval for future plants.

Further this information has substantial commercial value as follows:

0 (a)

Westinghouse plans to sell the use of similar information to its customers for purposes of meeting NRC requirements for advanced plant licenses.

f (b)

Westinghouse can sell support and defense of the technology to its customers in the licensing process.

Public dicciusure of this proprietary information is likely to cause substantial harm to the competiuve position of Westinghouse because it would enhance the ability of competitors to provide similar advanced nuclear power designs and licensing defense services for commercial power reactors without commensurate expenses. Also, public disclosure of the information would enable others to use the information to meet NRC requirements for licensing documentation without purchasing the right to use the informanon.

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_.___._____._____y AW-97-1114

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The development of the technology described in part by the information is the result of applying the results of many years of experience in an intensive Westinghouse effort

,i and the expenditure of a considerable sum of money.

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. h order for competitors of Westinghouse to duplicate this information, similar

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technical programs would have to be performed and a significant manpower effort, having the requisite talent and experience, would have to be expended for developing i

analytical methods and receiving NRC approval for those methods.

5 Further the deponent sayeth not.

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NRC REQUEST FOR ADDITIONAL INFORMATION g

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Question 440.339 Re: WCAP-14206 (NOTRUMP CAD)

On Page 4-16, item 2, it is stated that since no change to the numerical scheme has been made to NOTRUMP that no noding nor time step studies are needed. The INEL disagrees with this statement. Since the successful performance of the passive safety systems depend on the accurate modeling of the small pressure differences that characterize AP600 phenomenological behavior, node and time step size can affect the magnitude of these small i

pressure differences driving the flow in the system. Please provide time step and nodalization studies tojustify the AP600 nodalization.

1

Response

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In addition to the nodalization studies performed and included in the level swell portion of the NOTRUMP Final Validation Report, Reference 440.339-1 (sections 4.2.5 and 4.3.4), other studies were performed. Summaries of three of these studies are attached: 1) PRHR noding, 2) CMT noding, and 3) AP600 time step sensitivity study.

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NRC REQUEST FOR ADDITIONAL INFORMATION

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s PRHR NODING STUDY The results of the calculations presented in the NOTRUMP Preliminary Validation Reports (References 440.339-1 & 2) for various break sizes for both the SPES and OSU test facilities showed underprediction of the PRHR heat transfer and a corresponding overprediction of the PRHR outlet temperature. To understand this difference between the test and NOTRUMP results, a PRHR nodalization study was conducted with a more detailed PRHR model for both the primary and secondary side of the PRHR. The nodalization study was performed using the SPES PRHR Model. This study was performed in two parts:

Part 1, described below as the " Stand-Alone PRHR Model", is developed based on the SPES 2 PRHR geometry. This pan, as the name indicates, models only the PRHR of the SPES-2 test facility and is connected to boundary nodes at the inlet and outlet of the PRHR.

Part 2, involves renodalization of both the primary and secondary side of the SPES-2 PRHR test facility and simulation of the 1 inch and 2 inch cold leg break transients.

Part 1 - (Stand-Alone PRHR Model Based on the SPES-2 PRHR Geometry)

The purpose of this portion of the study is to determine the effect of alternate noding of the primary side of the PRHR. The IRWST is modeled as two nodes as in the Preliminary Validation Repon. Three different noding schemes are studied as shown in Figures 440.339-1 through 440.339-3. The first scheme is a three node PRHR model(Figure 440.339-1). This model provides a basis for the rest of the study.

The second model (Figure 440.339-2) is a four node PRHR model, with two horizontal nodes to model the top horizontal section of the PRHR piping. The third model(Figure 440.339-3) is a five node PRHR model, with three horizontal nodes to model the top horizontal section of the PRHR piping. Two boundary nodes, one at the entrance and the other at the exit of the PRHR were modeled at subcooled fluid conditions, with the inlet flow varying between 1.0 and 0.175 lbm/sec (with a flow velocity varying between 8.4 ft/sec and 1.7 ft/sec). Based on Reference 440.339-3, which indicates that a large fraction of the total PRHR heat transfer occurs in the initial horizontal section of the PRHR tubes, it was believed that reno &lization of the top horizontal section of the PRHR tube would result in closer agreement with the test data. However, the results of this study (discussed later) show that the horizontal nodalization has negligible effect on the calculated PRHR outlet temperatures. This led to the renodaliza?. ion of the venical section of the PRHR tubes, which is discussed in Pan 2 below.

Part 2 - Ofodel of the SPES-2 Test Fenity)

In this pan of the study, both the primary (vertical section) PRHR tubes and the IRWST were renodalized to study the effect on the PRHR heat transfer. The SPES-2 model was chosen since it is believed to be more critical; its transients involve the same temperature gradients between the primary system and the IRWST as the AP600 plant. Two different noding schemes were chosen for the vertical section of the 440.339-2 T Westinghouse

s NRC REQUEST FOR ADDITIONAL INFORMATION g

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g PRHR tube. The first model (Figure 440.339-4) is a four raie model and the second model (Figure 440.339-5) is a 16 node model. The secondary side of the PRHR is renodalized (using i1 nodes) which includes an influence zone described below.

Influence Zone The influence zone model is shown in Figures 440.339-4 and 440.339-5. Smaller size fluid nodes (see below for additional details) are modeled in the region surrounding the vertical section of the PRHR tube to form a hydraulic channel around the tube. The remaining portion of the IRWST is modeled with large size nodes. This method is chosen because the PRHR will be heating a relatively small portion of the overall IRWST water volume in the region near the PRHR tubes and will cause a recirculation flow due to bouyancy effects within the IRWST. This allows for more accurate prediction of the PRHR heat transfer and a better match to the test data. The original SPES-2 model used in the preliminary validation calculations (Reference 440.339-1) consisted of a two-node IRWST, and only one node had heat links connected to the PRHR tube, so no circulation was simulated.

3D/3D Influence Zone Model The boundary of the influence zone is first calculated as 3 times the PRHR tube outer diameter, based on the experimental data (Reference 440.339-5) showing that the water temperature drops to bulk temperature of the tank moving outward radially from the tube wall. The IRWST is divided cross-sectionally into two parts: the influence zone (nodes 166 through 170) and the rest of the tank (nodes 171 through 176). The 3D/3D corresponds to the effective flow area of the heat links calculated based on three times the PRHR tube diameter and the hydraulic channel fluid node volume and flow link flow area also calculated based on three times the PRHR tube diameter.

3D/SD Influence Zone Model To increase the amount of secondary side water that the PRHR tube interacts with, the influence zone fluid node volume and flow link flow area are increased to be based on five times the tube outer diameter, while the effective flow area of the heat links are maintained at three times the tube diameter. The large influence zone model allows more liquid to be heated and mixed around the PRHR tubes, thus affecting the PRHR heat transfer characteristics.

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s NRC REQUEST FOR ADDITIONAL INFORMATION g-

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RESULTS OF PRHR NODING STUDY Stand-Alone PRHR Model Simulations The results of the stand-alone PRHR model are shown in Figures 440.339-6 through 440.339-11. These results indicate that renodalization of the horizontal section of the PRHR has very little effect on the predicted PRHR outlet temperature (see Figure 440.339-11). Figures 440.339-6 through 440.339-9 show that the PRHR inlet temperature, is higher at the entrance (first PRHR node 111) as the number of horizontal nodes increase. This is expected with smaller node size, which has less heat transferred to the metal. However, the temperature at the top of the vertical section of the PRHR (or the end of the horizontal section), varies very little as the number of horizontal nodes are increased. This indicates that the overall heat transfer in the horizontal portion of the PRHR tubes has not changed very much due to increased number of primary side nodes. This being the case, the fluid temperature predicted in the rest of the PRHR show very little difference between the three cases analyzed. This led to the study of the effect of increased nodes in the vertical portion of the PRHR tubes which was performed as part of the SPES-2 PRHR sensitivity study.

Increased Vertical PRHR Nodes and Increased IRWST Nodes with Influence Zone 1

The results of the SPES-2 tests simulation using the three diffferent nodalizations are shown in Figures 440.339-12 through 440.339-41. Figures 440.339-12 through 440.339-28 show the results of the 2-inch cold leg break simulation. The PRHR inlet and outlet temperatures are compared for the various cases analyzed with the SPES-2 test data (Figures 440.339-12 and 440.339-13). The inlet temperature plots j

show that there is negligible difference between the various cases presented, which is to be expected. The PRHR outlet temperature is shown in Figure 440.339-13 for the various cases analyzed. Comparing this figure to Figure 7.3.1-31 given in the Final Validation Report (Reference 440.339-4), it is seen that the i

more detailed noding affects the PRHR outlet temperature to a great extent in the first 200 seconds of the transient, which results in lower temperatures as co'mpared to the data. To get a better understanding of this temperature difference between the original model (presented in Reference 440.339.4) and the more detailed model of the PRHR, the primary to secondary heat transfer within the PRHR was more closely studied between the two simulations and discussed below.

The case with the 16 vertical PRHR nodes with the larger influence wne was chosen for this comparison, since Figure 440.339-13 shows that the effect of the larger influence zone (with the larger hydraulic channel surroundmg the vertical portion of the PRHR tubes) is more pronounced than the effect of increasing the number of nodes in the vertical portion of the PRHR. Figures 440.339-14 and 440.339-15 are snapshots of the NOTRUMP results at 200 seconds and 700 seconds for the two cases. The primary to secondary heat transfer rates at various representative sections (to show the trend) of the PRHR along with the fluid velocity in the IRWST are given for the two cases. These figures show that the more detailed secondary noding induces a recirculation flow within the IRWST (which is not present in the "33" W Westinghouse

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original case) resulting in a higher heat transfer rate at the vertical section of the PRHR and therefore lower PRHR temperatures. The flow induced in the secondary side due to more detailed noding, places j

it in the subcooled forced convection regime, which results in a higher heat transfer rate. The higher heat -

i transfer rate is more due to the fact that the forced convection model uses the bu!k fluid temperature i

rather than the saturation temperature (T,J as the heat sink. This indicates that the modeling of the j

PRHR secondary side (IRWST) has a greater influence on the PRHR heat transfer than increasing the number of nodes on the PRHR primary side. The overall PRHR heat transfer and the primary to secondary heat transfer for the various sections of the PRHR are plotted in Figures 440.339-17 through 3

440.339-20. These figures show that the model with the larger influence zone does result in a higher heat transfer rate thus lowering the PRHR fluid temperature. Note that Figure 440.339-13 shows that the j

outlet fluid temperature is underpredicted during the first 200 seconds of the transient. However, Figure i

440.339-17 shows that the overall PRHR heat transfer is also underpredicted for the first 200 seconds.

2 This implies that the PRHR heat transfer underprediction is due to a PRHR flow (Figure 440.339-16) i which is too low early in the transient. Figures 440.339-21 through 440.339-29 show the primary and l

secondary pressures and the flows from the accumulators, CMTs, IRWSTs and the ADS Stages 1-3.

These plots indicate that changing the PRHR noding has negligible effect on the overall transient and the timinar. of the various events during the transient. These sensitivity studies were termmated at 1700 secs, after which time the PRHR heat transfer is not significant.

Figures 440.339-30 through 440.339-43 show the results of the 1-inch cold leg break simulation. These sensitivity studies were terminated at 4000 seconds for the 4 node model, after which time the PRHR heat transfer is not significant. However, the simulation with the 16 node model was terminated earlier at 2500 seconds, since sufficient information about the trends of the results are obtained by this time.

Plots presented are similar to those presented for the 2-inch cold leg break. The PRHR inlet and outlet temperatures are compared for the various cases analyzed with the SPES-2 test data. Only the cases with the large influence zone are analyzed based on the results of the 2-inch cold leg break simulations.

Summarizing thece results, it can be seen that the PRHR outlet temperatures are lower than those shown in Figure 7.3.2-31 of Reference 440.339-4 for the same transient during the first 2000 seconds of the transient, for the same reasons as in the 2 inch cold leg break case. The figures also show that the case with the 16 vertical nodes results in slightly lower temperatures as compared to the case with the 4 vertical nodes. The plots of the PRHR heat. transfer rates are given in Figures 440.339-33 through 440.339-36. Figures 440.339-37 through 440.339-43 showing the primary and secondary pressures and the flows from the accumulators, CMTs, IRWSTs and the ADS Stages 1-3 indicate that the more detailed noding of the secondary side has negligible affect on the overall transient and the timings, as in the 2-inch cold leg break simulanons.

440.339-5

d NRC REQUEST FOR ADDITIONAL INFORMATION

!k CONCLUSIONS OF PRHR NODING STUDY Based on the results of the PRHR noding study discussed above, it is concluded that more detailed noding of the PRHR primary and secondary side results in underprediction of the PRHR primary outlet temperatures early in the transient (i.e., overprediction of PRHR heat transfer). The prediction is better later in the transient. However, the overall prediction is not significantly improved using detailed noding.

As indicated above, the main reason for the underprediction of PRHR heat transfer in the base case is underprediction of PRHR primary flow. The more detailed noding of the PRHR secondary is not needed and the original noding scheme with two secondary nodes is adequate for code validation, particularly since underprediction of the PRHR heat flow rate will lead to conservative results.

440.339-6 3 Westinghouse

NRC REQUEST FOR ADDITIONAL INFORMATION HE q 6

1 CORE MAKEUP TANK (CMT) NODING STUDY This section summarizes a noding study related to the Core Makeup Tanks (CMT). The Oregon State University (OSU) integral effects test SB23 (0.5-inch cold leg break) is chosen for the CMT noding study, due to the sensitivity of this simulation to the performance of the CMTs regarding thermal stratification / mixing effects.

The reference NOTRUMP simulation for OSU test SB23 which is used as a base for comparison in this CMT noding study is documented in Section 8.3.2 of Reference 440.339-4. Specifically, it is the OSU SB23 simulation identified as "adjus'ed", which uses cold initial CMT temperatures and 125% PRHR heat transfer area. This case employs a 4-node CMT model (as do all of the OSU, SPES-2, and AI400 plant NOTRUMP simulations), in which the size of the CMT nodes varies from the smallest node at the top to the largest node at the bottom (the total tank volume division is 10% in the top node,15% in the n ext two nodes down, and 60% in the bottom node). As explained in Reference 440.339-4, the adjustments in the NOTRUMP simulation of OSU test SB23 were performed in an attempt to obtain a more rnsonable representation of the ADS Stages 1 through 3 actuation times. The concern with the original," unadjusted" 4-node CMT NOTRUMP simulation of OSU test SB23, as reported in Reference 440.339-4, was a significant (approximately 2000 seconds) delay in the prediction of ADS actuation compared to the test data. This was attributed to a high core inlet temperature NOTRUMP prediction, which caused system repressurization and resulted in delayed CMT draining (and thus delayed ADS actuation). The' high core inlet temperature was caused in part by excessive thernul mixing in the CMTs, so that the water leaving the CMTs was too hot compared to the test data, and underpredicted PRHR heat removal, so that the water leaving the PRHR was too hot compared to the test data. To conhrm that CMT and PRHR model deficiencies caused the poor prediction, the NOTRUMP model was " adjusted" with cold initial CMT temperatures and 125% PRHR heat transfer area. The adjustments lowered the core inlet temperature, which ultimately resulted in ADS actuation close to that of the test data, as reported in Reference 440.339-4. The " adjusted" case with cold initial CMT temperatures and 125% PRHR heat transfer area represents the best NOTRUMP simulation of OSU test SB23 with the 4-node CMT model.

The NOTRUMP CMT noding sensitivity study for OSU test SB23 uses 20 equal nodes in each CMT. Three NOTRUMP transients with the 20-node CMT model are performed, and comparisons are made to the

" adjusted" OSU test SB23 simulation with the 4-node CMT model of Reference 440.339-4 (which hereafter is referred to as the "NOTRUMP OSU SB23 4-node CMT reference case"). The first transient with the 20-node CMT model employs the cold initial CMT temperatures and 125% PRHR heat transfer area, in order to provide a one-to-one comparison with the NOTRUMP OSU SB23 4-node CMT reference case.

The other two transients are variation cases with the 20-node CMT model, one with nommal initial CMT temperatures and 125% PRHR heat transfer area, and the other with nommal initial CMT temperatur.es and nommal PRHR heat transfer area. The pertinent portion of the transient for this study is 0 to 2500 seconds (" transient part 1" of the NOTRUMP OSU SB23 4-node CMT reference case), which extends through ADS Stages 1 through 3.

The noding diagrams for the NOTRUMP OSU 4-node CMT model are contained in Figure 8.2-2 of Reference 440.339-4 for the fluid nodes and flow links, and in Figure 8.2-3 of Reference 440.339-4 for the 440.339-7

i NRC REQUEST FOR ADDITIONAL INFORMATION r "iE metal nodes and heat links. The noding diagrams for the NCTTRUMP OSU 20-node CMT model are contained in Figures 440.33944 through 440.33947. Figure 440.339-44 contains CMT-1 fluid nodes and flow links, Figure 440.339-45 contains CMT-2 fluid nodes and flow links, Figure 440.33946 contains CMT-1 metal nodes and heat links, and Figure 440.339-47 contains CMT 2 metal nodes and heat links.

RESULTS OF CMT NODING STUDY in the following discussions, the NOTRUMP OSU SB23 simulations are referred to as Cases 1 through 4:

Case 1 is the NOTRUMP OSU SB23 4-node CMT model with cold CMT temperatures and 125% PRHR heat transfer area (i.e., the NOTRUMP GSU SB23 4-node CMT reference case of Reference 440.339-4);

Case 2 is the NOTRUMP OSU SB23 20-node CMT model with cold CMT temperatures and 125%

PRHR heat transfer area; Case 3 is the NOTRUMP OSU SB23 20-node CMT model with nominal CMT temperatures and 125%

PRHR heat transfer area; Case 4 is the NOTRUMP OSU SB23 20-node CMT model with nominal CMT temperatures and nominal PRHR heat transfer area.

Table 440.339-1 contains a comparison of key event times for these four cases. Table 440.339-2 lists the figures which contain the plotted results for these cases. Figures 440.339-48 through 440.339-63 contain plots of quantities which are directly applicable to this CMT noding study. These include CMT temperature profile plots for Cases 1 through 4 in Figures 440.339-48 through 440.339-55, and comparison plots of all cases and the test data for CMT bottom temperatures, CMT levels, PRHR outlet temperature, core inlet temperature, and DVI temperatures in Figures 440.339-56 through 440.339-63. The remaining Wrtres 440.339-64 through 440.339-70 contain plots of other key system quantities. Note that the time h is 0 ts *)00 seconds in all of the Figures 440.33948 through 440.339-70, to match that used in the plots in Section 8.3.2 of Reference 440.339-4, for ease of comparison.

For the one-tcx>ne comparison of the transient results of Case 1 and Case 2 (i.e., the straight comparison of the 4-node CMT model to the 20-node CMT mode! with no other differences), the CMT bottom node temperature plots (Figure 440.339-56 for CMT-1; Figure 440.339-57 for CMT 2) show a decrease in the thermal mixing in the CMTs with the 20-node CMT model The bottom node of each CMT starts to heat up early in Case 1, at approximately 200 seconds, while in Case 2, the heat up begins later, at approximately 800 seconds. The CMT temperature profile plots of Figures 440.339-48, 440.339-49, 440.339-52, and 440.339-53 show that the finer noding in Case 2 produces a more gradual decrease in the temperatures from the top node to the bottom node of each CMT with a flatter profile near the bottom, which also indicates that thermal mixing is reduced in the CMTs with the 20-node model. The lower outlet temperature of the CMTs in Case 2 directly leads to a lower temperature in the DVI nodes in Case 2, as indicated in Figure 440.339-62 for DVI-1 and Figure 440.339-63 for DVI-2. The DVI nodes are also affected by the injection of the accumulators, which are discussed briefly below. Correspondingly, 440.339-8 T Westingt10use

NRC REQUEST FOR ADDITIONAL INFORMATION

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Case 2 has a lower core inlet temperature than Case 1 does, as indicated in Figure 440.339-61. During the CMT draining period and before ADS actuation, the core inlet temperature in Case 2 is lower than it is in Case 1 by as much as approximately 15 to 20*F. The other contributor to the core inlet temperature, the PRHR outlet temperature, is essentially the same in Cases 1 and 2 (as indicated in Figure 440.339-60) as expected, since bcth cases employ the 125% PRHR heat transfer area.

Regarding the CMT levels in the Case 1 to Case 2 comparison, the CMTs stan drair ng slightly earlier in a

Case 2 compared to Case 1 (CMT-1 approximately 40 seconds earlier and CMT-2 approximately 60 seconds earlier, referring to Table 440.339-1). The CMTs then drain slightly faster in Case 2 than in Case 1, as indicated in the CMT level plots (Figure 440.339-58 for CMT-1; Figure 440.339-59 for CMT-2). This behavior in the CMT levels leads to ADS actuation approximately 400 seconds earlier in Case 2 than in Case 1 (recall from Table 8.3.2-1 of Reference 440.339-4 that ADS stage 1 actuation occurs when the CMT level relative to the bottom tap decreases to 41 in. (3.4 ft.), plus 15 seconds). Relative to the test data, the CMT drain prediction in Case 2 is poorer than it is in Case 1. The more rapid CMT drain rate in Case 2 compared to Case 1 is related to the water in the smaller top node in the 20-node CMT model reaching saturation more quickly than the water in the larger top node in the 4-node CMT model. The results and trends of the other key system parameters (Figures 440.339-64 through 440.339-70) are similar in Cases 1 and 2. However, it is observed that the pressurizer pressure (Figure 440.339-64), during the CMT draining period and before ADS actuation, decreases more in Case 1 than it does in Case 2, by as much' as approximately 40 psia. Consistent with this, the accumulators drain faster in Case 1 than they do in Case 2 during this period, as seen in the accumulator level plots (Figure 440.339-65 for ACC-1; Figure 440.33946 for ACC-2).

Next, including the more realistic cases of nominal initial Ch'T temperatures with the 20-node CMT model, Cases 3 and 4, in.he comparison discussion, it is observed that the temperature of the bottom node of each CMT (Figures 440.339-56 and 40.339-57) is almost the same in Cases 3 and 4 (as is the case with the temperature of each DVI node, p. Nures 440.339-62 and 440.339-63). In both Cases 3 and 4, the heat up of the bottom node of each U N ' tarts at approximately 800 seconds, which is analogous to the behavior in Case 2 (it is only shi- : n the temperature scale due to the initial CMT temperature difference). Also, the heat up rate of the bottom node of each CMT before ADS actuation is less in Cases 3 and 4 than it is in Case 2. However, the test data indicates essentially no heat up in the bottom of the CMT until after 2000 seconds, and only a slight heat up thereafter in the time period just before ADS actuation. After ADS actuation and before the CMTs drain completely, the rapid heat up of the bottom node of each CMT in all three 20-r. ode CMT cases (Cases 2 through 4) is similar to that of the test data (it is only stufted in time due to the ADS actuation time differences). Cases 2 through 4 all have ADS actuation earlier than in Case 1 (Case 2 approximately 400 seconds earlier, as stated above; Case 3 approximately 370 seconds earlier; Case 4 approximately 330 seconds earlier). The differences in ADS actuation times in Casas 3 and 4 as compared to Case 2 are consistent with the times at which the CMTs begin draining. The PRHR outlet temperature is approximately the same in the cases with 125% PRHR heat transfer area (Cases 1 through 3), and this value is correspondingly lower than the PRHR outlet temperature in Case 4 with nommal PRHR heat transfer area (see Figure 440.339-60). Although the artificial increase of the PRHR heat transfer area to 125% of nommal in Cases 1 through 3 yields a lower PRHR outlet temperature which is closer to the test data than that of Case 4, it is still considerably higher i

440.339-9

NRC REQUEST FOR ADDITIONAL INFORMATION g==_

~

than the test data value ' suggesting that an artificial increase of the PRHR heat transfer area to value higher than 125% of nominal may improve it even more). In Cases 3 and 4 before ADS actuation, given that the CMT outlet temperatures are the same and the PRHR outlet temperature is lower in Case 3, the core inlet temperature is correspondingly lower in Case 3 than in Case 4 (see Figure 440.339-61). In general, the results and trends of the other key system parameters (Figures 440.339-64 through 440.339-70) are close to each other in the three 20 node CMT cases (Cases 2 through 4).

CONCLUSIONS OF CMT NODING STUDY The NOTRUMP OSU SB23 CMT noding study shows that the 20-node CMT model results in a more realistic CMT thermal stratification / mixing representation, enough to cause a delay in the increase of the CMT injection temperature to enable more reasonable ADS actuation times, compared to the 4-node CMT model without adjustments. From the one-to-one comparison of the 4-node CMT model to the 20-node CMT model with no other differences (both having the artificial cold initial CMT temperatures and 125%

l PRHR heat transfer area), there is a marked improvement with the 20-node CMT model, in that it shows a decrease in thermal mixing in the CMTs. The onset of heat up of the bcitom node of each CMT is delayed significantly in the 20-node case, to approximately 800 seconds as opposed to only about 200 seconds in the 4-node case. This is still earlier than the test data, which shows no heat up in the bottom of the CMT until approximately 2000 seconds. Although the actuation of ADS is predicted to occur approximately 400 seconds earlier in the 20-node case than in either the 4-node case or the test (due to a slightly faster draining of the CMTs in the 20-node case), this is still much more reasonable than the delayed (approximately 2000 seconds) ADS actuation in the original " unadjusted" 4-node case.

The return to nommal initial CMT temperatures with the 20-node CMT model (while retaining the 125%

PRHR heat transfer area) yields results which are not very different than those of the 20-node CMT model with cold initial CMT temperatures (and 125% PRHR heat transfer area). This shows that the CMT noding is sufficient to decrease the thermal mixing in the CMTs, such that it is not necessary to artificially decrease the initial CMT temperatures with the 20-nede CMT model It is also noted that the onset of heat up of the bottom node of each CMT in the 20-node modelis independent of the initial CMT temperatures; the heat up of the bottom node of each CMT in the 20-node model begins at approximately 800 seconds with either the cold or the nonunalinitial CMT temperatures. The return to nominal PRHR heat transfer area with the 20-node CMT model (while retaining the nominal initial CMT temperatures) yields results which are not very different than those of the 20-node CMT model with 125% PRHR heat transfer area (and nonunal initial CMT temperatures). This shows that the PRHR performance is not as important as the behavior of the CMTs (both the CMT outlet temperature and CMT level draining) in this simulation.

However, it is true that artificially increasing the PRHR heat transfer area to 125% of nominal allows the NCTTRUMP prediction of the PRHR outlet temperature to more closely match the test data, suggesting that further increasing of the PRHR heat transfar area could improve it even more.

The conclusion of this study is that using more nodes in the CMTs represents a way to approximately simulate the CMT thermal stratification effects, to help account for the lack of a CMT thermal stratification model in NOTRUMP. This technique can be used to improve the CMT outlet temperature behavior in small break transients. This CMT noding study supports the conclusions of the independent assessments 440.339-10 W Westinghause

NRC REQUEST FOR ADDITIONAL 'NFORMATION

g=

=I i

y that are being conducted for the preparation of the summary section for Revision 2 of the NOTRUMP Final Validation Report for AP600. The summary section will indicate that the lack of a CMT thermal stratification model and the coarse coding used lead to significant differences in the CMT outlet temperature and resulting small break transients, but that the continued use of the 4-node CMT model is acceptable because its effect on the transient is conservative (high core void fraction, delayed ADS).

440.339-11 W Westinghouse

NRC REQUEST FOR ADDITIONAL INFORMATION

[

Table 440.3391 OSU SB23 0.5-inch Cold Leg Break Events Event Test NOTRUMP NOTRUMP NOTRUMP NOTRUMP (seconds)

Case 1 Case 2 Case 3 Case 4 i

(seconds)

(seconds)

(seconds)

(seconds)

~

CMT-1 Starts 1145 1105 1135 1160 Draining a

CMT-2 Starts 1165 1105 1135 1155 Draining ADS Stage 1 Open 2276 1871 1909 1947 ADS Stage 2 Open 2323 1918 1956 1994 ADS Stage 3 Open 2383 1978 2016 2054 ADS Stage 4 Open

'2891 2198 2230 2261

• Accumulator-1

'2579 2183 2136 2278 Empty Accumulator-2

• 2582 2188 2239 2281 Empy Explanation of NOTRUMP " Cases" in Table 440.339-1 Case 1: 4-node CMT, cold initial CMT temperatures, M PRHR heat t, --fer area; (the NOTRUMP OSU SB23 4-node CMT reference case from Referent ;t'G9-4);

Note: these events in Case 1 occurred in part 2 of the transient (which was started at 2500 seconds), in which the PRHR was removed from the model Case 2: 29 node CMT, spjd initial CMT temperatures,125% PRHR heat transfer area; (case for ore-to.one companson with Case 1; only difference is 20 CMT nodes instead of 4).

Case 3: 29-node CMT, nonunal initial CMT temperatures,125% PRHR heat transfer area; (variation case; return to nommal initial CMT temperatures).

Case 4: 29-node CMT, nommal initial CMT temperatures, nommal PRHR heat transfer area;

("ariation case; return to nommal initial CMT temperatures and PRHR heat transfer area).

440.339-12 Westinghouse

1

~

NRC REQUEST FOR ADDITIONAL INFORMATION gEmish 1

Table 440.339-2 Plot Figures for OSU SB23 0.5-inch Cold Leg Break Results Figure No.

Title 440.339-48 NOTRUMP CMT-1 Temp Profile - 4nd Cold CMT Temps,125% PRHR HT 440.339-49 NOTRUMP CMT-1 Temp Profile - 20nd Cold CMT Temps,125% PRHR HT 440.339-50 NOTRUMP CMT-1 Temp Profile - 20nd Nom CMT Temps,125% PRHR HT 440.339-51 NOTRUMP CMT-1 Temp Profile - 20nd Nom CMT Temps, Nom PRHR HT 440.339-52 NOTRUMP CMT-2 Temp Profile - 4nd Cold CMT Temps,125% PRHR HT 440.339-53 NOTRUMP CMT-2 Temp Profile - 20nd Cold CMT Temps,125 7. PRHR HT 440.339-54 NOTRUMP CMT-2 Temp Profile - 20nd Nom CMT Temps,125% PRHR HT 440.339-55 NOTRUMP CMT-2 Temp Profile - 20nd Nom CMT Temps, Nom PRHR HT 440.339-56 CMT-1 Bottom Temperature Comparison 440.339-57 CMT-2 Bottom Temperature Comparison 440.339-58 CMT-1 Level (Relative to Bottom Tap) Comparison 440.339-59 CMT-2 Level (Relative to Bottom Tap) Comparison 440.339-60 PRHR Outlet Temperature Comparison 440.339-61 Core Inlet Temperature Comparison 440.339-62 DVI-1 Temperature Comparison 440.339-63 DVI-2 Temperature Comparison 440.339-64 Pressurizer Pressure Comparison 440.339-65 ACC-1 Level (Relative to Bottom Tap) Comparison 440.339-66 ACC 2 Level (Relative to Bottom Tap) Compar&n 440.339-67 ADS 1-3 Integrated Total Mass Flow Comparison 440.339-68 Integrated Total Break Mass Flow Comparison 440.339-69 SG-1 Pressure Comparison 440.339-70 SG-2 Pressure Comparison 440.339-13

NRC REQUEST FOR ADDITIONAL INFORMATION

?

~

s AP600 TIME STEP SENSITIVITY STUDY In order to investigate the sensitivity of the AP600 plant results to changes in the time step size used, a study was performed. The 2-inch cold leg break in fluid node 19 was chosen for the study as a representative case for the plant. The base case for this study is the plant SAR case reported in Reference 440-339-6. The NOTRUMP code calculates a variable time step size as described in Section 10 of Reference 440.339-7. The time step size is limited between maximum and nummum values input by the user. The maximum and minimum values used for all AP600 calculations are 0.01 sec and 0.0001 sec respectively.

To determine a reasonable time step size to be set for the sensitivity study, the time step size for the base case was plotted and a significantly smaller time step size was chosen such that the base calculation time step size is bounded most of the time. The value chosen for the study was 0.001 sec. This time step was set constant by setting both the maximum and muumum values to 0.001 sec. The results of this sensitivity are shown in Figures 440.339-72 through 440.339-85 which compare the base results to the sensitivity case for the key variables. As can be seen, although there are minor differences in results, the trends are nearly identical with little change in core mixture level and DVI injection flow rates. This confirms the code predictions are well converged and not sensitive to reductions in the time step size.

440.339-14 W Westinghouse

NRC REQUEST FOR ADDITIONAL INFORMATION OVERALL CONCLUSIONS The results of the sensitivity studies included in the response to this RAI show that NOTRUMP for AP600 is converged with respect to time step size. In addition, variations in PRHR noding had little effect on the results. Increasing the number of CMT nodes results in a more correct simulation of stratification, but 4

retaining the 4 node CMT model is conservative.

References:

440339-1 Meyer P.E. et. al, "PXS-GSR-002: NOTRUMP Preliminary Validation Report for SPES-2 Tests", Westinghouse Electric Corporation, July 1995.

440.339-2 Willis, M.G. et. al, "LTCT-GSR-001: NOTRUMP Preliminary Validation Report for OSU Tests", We.stinghouse Electric Corporation, July 1995.

440.339-3 WCAP-14292, Revision 1, "AP600 Low-Pressure Integral Systems Test at Oregon State University Test Analysis Report", Section 6.1.2 [LTCT-T2R-600].

440.339-4 WCAP-14807, Revision 1, "NOTRUMP Final Validation Report for AP600", by Fittante, R. L. et. al, January 1997.

i 440.339-5 WCAP-12980, "AP600 Passive Residual Heat Removal Heat Exchanger Test Final Report",

Rev. 2, by Hochreiter, L. E., et. al, September 1996.

440.339-6 Letter NSD-NRC-97-5136, dated 5/15/97.

440.339-7 WCAP-10079-P-A, "NOTRUMP - A Nodal Transient Small Break and General Network Code", by Meyer, P. E., August 1985.

SSAR Revision:

NONE

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PRHR Noding Study Stand-Alone PRHR Model Temperature

'n Top Horz PRHR Node TMFN 111

- Base Case (3 Node PRHR)

TMFN 111 2

Horz Nodes (4 Node PRHR)

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TMFN 111

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- 2 Horz Nodes (4

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TMFN 112 - 2 Horz Nodes (4 Node PR4R)

---

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- TMFN 112 - 3 Horz Nodes (5 Node PRHR)

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Base Case (3 Node PRHR)

TMFN 117 - 2 Horz Nodes (4

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TMFN 118 - 2 Horz Nodes (4 Node PRHR)

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PARAMETER TIME = 200 secs TIME = 700 secs QMIIL i11 to 67 25.4 Blu/sec 53.8i Bru/sec QMHL i14 to 67 13.44 Bru/sec 36.86 Bru/sec QMllL 117 to 67 3.75 Btu /sec 11.05 Btu /sec QMill iI8 to 67 3.18 Btu /sec 7.42 Bru/sec 114 IIeat transfer mode a Nucleate Boiling (NB) i15 67 QMHL - Heat transfered fiom metal to fluid 116 i17 118 l

Note: In this original noding scheme no influence zone is modeled.

68 Therefore, the flow velocity within the IRWST is 0.0.

The NOTRUMP heat transfer package always choses NB as the heat transfer mode at zero velocity.

Prhr Fluid Node r

, Secondary Fluid Node g

Boundaries t _ a Boundaries l

Figure 440339 Snapshot of PRIIR IIeat 1Yansfer for the Original Model(Fmm Reference 3)

17I I

170 PARAMETER TIME = 200 secs TIME = 700 secs

---

____.L_______

l 11i ll QMHL i11 to 172 26.4 Btu /sec 53.27 Bru/sec E

l (NB*)

(NB*)

l

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QMIIL(l33-136) 19.03 Btu /sec 40.97 Btu /sec 172 1 E 169 to 169 (SCFC*)

(NB*)

236 _____

l

_132 QMilL (145-148) 4.91 Btu /sec 15.19 Bru/sec g _ng to 166 (SCFC*)

(SCFC*)

I QMllL i18 to 175 1.22 Blu/sec 4.76 Bru/sec

-____________-_}.

_L40 (SCNC*)

(SCNC*)

l 141 l g Fluid Velocity 1.5 ft/sec 1.3 ft/sec 174 1 143 Within the IRWST

---_________---.L L44.____-

I

_1 11 1

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_L43 Note: * - Defines the lleat Transfer Regime NB

- Nucleate boiling SCFC

- Subcooled forced convection PRilR Fluid Node rg, Secondary 4.nid Node SCNC

- Subcooled natural convection Boundaries t- - s Boundarie.

Figure 440.339 Snapshot of PRIIR IIcat 'IYansfer for the 16 Vert Node PRIIR Model

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SPES Test S00303 2

inch Cold Leg Break PRHR Heat Transfer Rate at Top Horz.

Section NOTRUMP Simulation -

16 Vert Nodes PRHR (30/3D IZ)

NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/5D IZ) 60 m

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0 500 1000 1500 2000 2500 3000 Time (s)

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SPES Test S00303 2

Inch Cold Leg Break PRHR Heat Transfer Rate at Mid Vertical Section NOTRUMP Simulation -

16 Vert Nodes PRHR (30/3D IZ)

NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/5D IZ)

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SPES Test S00303 2

Inch Cold Leg Break PRHR Heat Transfer Rate at Bottom Horz.

Section NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/3D IZ)

NOTRUMP Simulalion -

16 Vert Nodes PRHR (3D/5D IZ)

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Figure 440.339-20

SPES Test S00303 2

Inch Cold Leg Break Pressurizer Pressure NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Veri Nodes PRHR (From Ref.

4) 2500

{

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1500 v

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a 1000 r;;;

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500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-21

SPES Test S00303 2

inch Cold Leg Break CMT-A Injection Line Moss Flow NOTRUMP Simulclion -

16 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

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n o

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Figure 440.339-22

SPES Test S00303 2

Inch Cold Leg Break CMT-B Injection Line Mass Flow NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4)

===-

5 rw n

o a3 in N

g

.3 N

_a 2

3 g

=

.3

/

l o

\\.

(

~

- :(

[

t u_

7

w 1;,

0 0

500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-23

SPES Test S00303 2

inch Cold Leg Break ACC-A Injection Line Mass Flow NOTRUMP Simulalion -

16 Vert Nodes PRHR (3D/50 IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4) 1

^

'8 N

E

.6

_a

^

j 4

se o

2 u-

'3-'-'--

3-- -'-'- ' "-

't' 0

0 500 1000 1500 2000 2500 3000 Time (s)

~

Figure 440.339-24

SPES Test S00303 2

inch Cold Leg Break ACC-8 injection Line Mass Flow NOTRUMP Simulation 16 Veri Nodes PRHR (3D/5D IZ)

=-; NOTRUMP Simulation 4

Veri Nodes PRHR (From Ref.

4) 1

^

8

\\

E

.6 l

4

~

3:

o 2

w f

' ^ ' '-

4-

>3-'-'--

t 0

0 500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-25

SPES Test S00303 2

Inch Cold Leg Break ADS Stage 1-3 I n.t e g r a t e d Flows NOTRUMP Simulation -

16 Vert Nodes PRHR (30/50 IZ)

NOTRUMP SimuIation -

4 Vert Nodes PRHR (From Ref.

4) 1000 E

_a

_ =..

/

800 v

ac O

600 u_

e o

400 o

I 200-e

~

C

' 3 3

3-3-'

0 0

500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-26

SPES Test S00303 2

Inch Cold Leg Break integrated Break Flow NOTRUMP Simulation -

16 Veri Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Veri Nc s PRHR (From Ref.

4)

_ 800 E

/;

_a 600 3

o u_

400 g

a o

200 o

e c-0 0

500 1000 1500 2000 2500 3000 Iime (s)

Figure 440.339-27

SPES Test S00303 2

inch Cold Leg Break

. Steam Generotor A

Pressure NOTRUMP Simulotion -

16 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4) 1200 m

o 1000

_Q___ -

en 800

~

a m

a; u

a 600 cn zn g

400 u

1 200 0

500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-28

SPES Test S00303 2

Inch Cold Leg Break Steam Generator B

Pressure NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/SD IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4) 1200 m

o 1000

v ;. -

o_

800

+

?

x u

a 600 m

m O

~

400 u

a 200 0

500 1000 1500 2000 2500 3000 Time (s)

Figure 440.339-29

_AfMr p h5M-de 2erh s i & J h4 uT---adE M +b 4 0 4 -*5 N ' Md I"h--

• O*-

N"

N j,-.

e' -

e I -

T

+

(a b.c) 4 J

?u 1

G,4 n

I 1

t d.

?

6 1

4 Y

4 4

l I

d R

1 Cm h

2 8=

ic 1

e b

O (a,b.e)

J I

w M

lCD b.

O V9 e

bY

\\

me E

i i

ammap amma w

~

maA.m J.

1J. JJK*h A44-

++4-hJmm eda..k.dLMsr4 d A a +A J -4s h w#AAM beR-A >44:1Ma-=J&-,JL4-

• Lh-44 4 - M AS 4-W a= 4 A IA hM, s444-4JJ.-8.%-=+

J A '4 s 5

m-uh.4.a.esea.d.+'en-

,4d 44 44'de-d#*A.,.p.

M d

A4aau mieweb w,em..

M

=

1 3

j I

i (a.b.c) d

?

I T

1 44 W

ke t

I d

4 4

1 i

e 4

5 a,

k

)

i w

j 9

S=

l

.E h

a f

A 4

e 1

8 l

4 1

J

?

4 1

M M

1 9

4

A

.a

.a a

a u m.i

_o 2

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• . 2 s

-u m.

s-

.. ~..r.

maa.__ _

_u.w_.

e 4

(n.d.c) l l

t l

I l

1 cpt b.

I O

h bY i

y

• put b

t I

r r

i I

I l

l 1

I i

1 i

i l

l

[

SPES Test S00401 1

Inch Cold Leg Break PRHR Heat Transfer Rate at Top Horz.

Section NOTRUMP Simulalion -

4 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

16 Vert Nodes PRHR (3D/SD IZ)

_ 60 o

o h50 l

~

'I"'

^~

40 vym

~

30

' [ j!!!!!!!!!!I!;!bljeg {

m b

~

c J

20 a

e n

9 i

hY

~

I'

0 h

i 0

10'00 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-34 i

t SPES Tesi S00401 1

Inch Cold Leg Breok PRHR Heat Transfer Rate at Mid Vertical Section NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/SD IZ)

NOTRUMP SimuIation -

16 Vert Nodes PRHR (3D/5D IZ) 40 m

o x

2 2 30 l

I L

'glff o

e 20

~

Mt1 f

10

-[

~

N e

I 0

i i

0 1000 2000 3000 4000 5000 6000 7000 Time (s)

~

Figure 440.339-35

SPES Test S00401 1

Inch Cold Leg Break PRHR Heat Transfer Rate at Bottom Horz.

Section NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation 16 Veri Nodes PRHR (3D/SD IZ) 20 m

0 x

s

~

15

- 1 e

0 10 m

e m

~

'"" C" 5

k r

U '

0 0

1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-36

SPES Test S00401 1

inch Cold Leg Break Pressurizer Pressure NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/SD IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref-4) 2500 o 2000 :\\

m

_y o_

1500 v

a2 A

u

_ }

a 1000 w

500 u

o-

' =

0 0

1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-37

SPES Test S00401 1

Inch Cold Leg Break CMT-A Injection Line Moss Flow NOTRUMP SimuIotion -

4 Veri Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4)

=

5

^

4 o

r a3 u)

E

'3

_a N

I 2

y J.

s::

I P%

[

[:

1--

m e '

0 0

1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-38

SPES Test S00401 1

inch Cold Leg Break CMT-B Injection Line Mass Flow NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation 4

Vert Nodes PRHR (From Ref.

4)

=;

5 n

o G)

CD N

'3 l'

E

_a

~

A A

2

j a

i o

- pg Q

L 1

m

' /-

t 0-0 1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-39

SPES Test S00401 1

Inch Cold Leg Break ADS Stage 1-3 Integrated Flows NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/5D IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4) 1000 E

_a 800 v

m o

600 u_

V o

400 l

l

~

f o

L J

200

-t e

c 0

3t-

-'3-

0 1000 2000 3000 4000 5000 6000 70'00 Time (s)

Figure 440.339-40

f SPES

,est S00401 1

Inch Cold Leg Break Integrated Break Flow NOTRUMP Simulation --

4 Vert Nodes PRHR (3D/5D IZ)

= NOTRJMP Simulation -

4 Veri Nodes PRHR (From Ref.

4) 800 E

o 700 500

/

i 400 g

o j

0) f 300 i

200 T

i /

100 t

~

c 0

0 1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-41

SPES Test S00401 1

inch Cold Leg Break Steam Generator A

Pressure NOTRUMP Simulation -

4 Vert Nodes PRHR (3D/SD IZ)

NOTRUMP Simulation -

4 Vert Nodes PRHR (From Ref.

4)

=;;;

1200 i

o 1000 m

- W

-. =:_

N a

800 v

a>

N a

600 en t

in i

aa 400 o_

200 0

1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-42

I SPES Test S00401 1

Inch Cold Leg Break Steam Generator B

Pressure NOTRUMP Simulation -

4 Vert Nodes PRHR (30/5D IZ)

NOTRUMP Simulation -

4 Veri Nodes PRHR (From Ref.

4) 1200 m

o 1000 m

-(

^ - - ::: :_.-

800 h

v a3 N

u a

600 m

w a) 400 u

a 200 0

1000 2000 3000 4000 5000 6000 7000 Time (s)

Figure 440.339-43 t

.._~

l Figure 440.339 44 NOTRUMP OSU CMT.1 Fluid Node / Flow Link Noding Diagram for 20 Node CMT Model

)

nuid noden JJ I

(from 53) pno.

reaux linu nowlinh i

139 4

I I

1J5p pM 3

138 1J7 p p g1 4

137 1J6g pE 1

136 IJJp pM 135 i

134g pM 134 i

133 37 pM 133 1

i 132 37 pM 132

\\

i l#1 g31 kE If I

1. 1. U If 13g k

i 129 k

II f

125 t2, pM 37 f

W jf 127 i

126 k

1f I

gg pM If f

1I 124 pM f

g3 pM If f

if 122 k

i 121 121 kE 37 I

(m S2)

II 128

$0 l

i

~

i Figure 440.339 45 i

NOTRUMP OSU CMT.2 Fluid Node / Flow Link Noding Diagram for 20 Node CMT Model i

63 2

(fmm e) p hu now redux nw hh I

139 I

i 173k kE 158 177k k22ft 157 1

2 170 p pM i

13' I

175 p pM 155 i

174 37 pM 154 17J 37 pM 153 172 37 pM 152 i

' 72 1f 131 kE t

l

1. 70 if 150 k

I d

l#9 1f 149 kE t

l#8 if 143 IE t

l#7 if 147 kE t

1. " If 146 k

I l## If 143 k

I

1. 1. 1. If 144 k

i l#J If g43 kE I

l#2 If 143 k

i

1. 1. 1. II 141 k

I (to 62)

II 144 60 i

i

P Figure 440.339-46 NOTRUMP OSU CMT 1 Metal Node / Heat Link Noding Diagram for 20-Node CMT Model metal nodes hees links Ruid nodes 1

r-b 1to 13P-139 4

13 5 ftR a

138 y'<

137 s :'

IM 136 ~;

136 rit 2

135.

135 rte 13

• 134

-a Itt p

1 133

2;.

111 13Z 132 Y

111 131 s

13L i

i

... J j

^

fin 130 tro 129

.i a

lJR M.'

123 2

197 127 E

h tu 126 7

d 17e 125 3

w N

11e W

gg4 m

w

/7i 123 m

t 122 12L 1si 121 12 5 w

AO 14n 120 a

m

NOTRUMP OSU CMT 2 Metal Node t nk 88 M mn for 20-Node CMT Model 8

innaJ nodse w%

auid nodes 1

159 -

1so l

159 TA 2

158, 158 197 g

157 m

ry 155 156

.h iss 15E 155 res 154 154 1st 15F 153 1

'W ts, g

152 14r IST 151 2

~

rth 150 153r tso 14M 149 i

h ggg I

147 147 I

146 146-ris tm 145

-u rse 144

144, I

143 1@

I 142 14 2 I

141 14 I

140 14et

L OSU S823 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-1 Temp Profile - 4nd Cold CMT Temps.125% PRHR HT TMFN 56 - CMT-1 Node 4

(Top)

Mixture Temperature

---

TMFN 55 - CMT-1 Node 3 Mixture Temperolure TMFN 54 - CMT-1 Node 2

Mixture Temperature

=

TMFN 50 - CMT-1 Node 1

(Bot)

Mixture Temperoture 500 m

u-

~

400 v

.n

^

300 a

f o

200 u

o l

a

~

E 100 j

/

0 0

1000 2000 3000 4000 Time (s)

Figure 440.339-48

OSU SB23 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-1 Temp Profile - 20nd Cold CMT Temps.125% PRHR HT TMFN 139 - CMT-1 Node 20 (Top)

Mixture Temperature TMFN 138 - CMT-1 Node 19 Mixture Temperature TMFN 137 - CMT-1 Node 18 Mixture Temperature

- TMFN 136 - CMT-1 Node 17 Mixture Temperature TMFN 135 - CMT-1 Node 16 Mixture Temperature

-- TMFN 134 - CMT-1 Node 15 Mixture Temperature

- TMFN 133 - CMT-1 Node 14 Mixture Temperature

-- TMFN 132 - CMT-1 Node 13 Mixture Temperature

---

TMFN 131

- CMT-1 Node 12 Mixture Temperature TMFN 130 - CMT-1 Node 11 Mixture Temperature TMFN 129 - CMT-1 Node 10 Mixture Temperature TMFN 128 - CMT-1 Node 9

Mixture Temperature TMFN 127 - CMT-1 Node 8

Mixture Temperoture

=

TMFN 126 - CMT-1 Node 7

Mixture Temperature TMFN 125 - CMT-1 Node 6

Mixture Temperature

: : :

TMFN 124 - CMT-1 Node 5

Mixture Temperature

==;

TMFN 123 - CMT-1 Node 4

Mixtere Temperoture

:==

TMFN 122 - CMT-1 Node 3

Mixture Temperature TMFN 121

- CMT-1 Node 2

Mixture Temperature TMFN 120 - CMT-1 Node 1

(Bot)

Mixture Temperature 500 7

~ 400 5 [,((k WMW"M u

3 Y,

???"

/

gn i 100 t; L'a'p' w

~

e 0

~

~

0 1000 2000 3000 4000 Time (s)

Figure 440.339-49

OSU SB23 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-1 Temp Profile - 20nd Nom CMT Temps.125% PRHR HT TMFN 139 - CMT-1 Node 20 (Top)

Mixture Temperature

---

TMFN 138 - CMT-1 Node 19 Mixture Temperoture

- - - - - TMFN 137 - CMT-1 Node 18 Mixture Temperoture

- TMFN 136 - CMT-1 Node 17 Mixture Temperature TMFN 135 - CMT-1 Node 16 Mixture Temperature

-- TMFN 134 - CMT-1 Node 15 Mixture Temperature

- TMFN 133 - CMT-1 Node 14 Mixture Temperature

-- TMFN 132 - CMT-1 Node 13 Mixture Temperature

---

TMFN 131

- CMT-1 Node 12 Mixture Temperature TMFN 130 - CMT-1 Node 11 Mixture Temperature TMFN 129 - CMT-1 Node 10 Mixture Temperature TMFN 128 - CMT-1 Node 9

Mixture Temperoture TMFN 127 - CMT-1 Nude 8

Mixture Temperoture

==:---

TMFN 126 - CMT-1 Node 7

Mixture Temperature TMFN 125 - CMT-1 Node 6

Mixture Temperoture

=

TMFN 124 - CMT-1 Node 5

Mixture Temperoture

==

TMFN 123 - CMT-1 Node 4

Mixture Temperature TMFN 122 - CMT-1 Node 3

Mixture Temperature

= TMFN 121

- CMT-1 Node 2

Mixture Temperature TMFN 120 - CMT-1 Node 1

(Bot)

Mixture Temperature 500 7

[', j

?k?-

&L E"

i/ U/I'< W'Yffdlh

{ 00 ['k Yd W AM O

0 1000 2000 3000 4000 Time (s)

Figure 440.339-50

OSU SB23 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-1 Temp Profile - 20nd Nom CMT Temps. Nom PRHR HT T M f i; 139 - CMT-1 Node 20 (Top)

Mixture Temperature

---

TMFN 138 - CMT-1 Node 19 Mixture Temperature

---

TMFN 137 - CMT-1 Node 18 Mixture Temperature

- TMFN 136 - CMT-1 Node 17 Mixture Temperature TMFN 135 - CMT-1 Node 16 Mixture Temperature

-- TMFN 134 - CMT-1 Node 15 Mixture Temperature

- TMFN 133 - CMT-1 Node 14 Mixture Temperature

-- T M F N 132 - CMT-1 Node 13 Mixture Temperature

---

TMFN 131

- CMT-1 Node 12 Mixture Temperoture TMFN 130 - CMT-1 Node 11 Mixture Temperature TMFN 129 - CMT-1 Node 10 Mixture Temperature TMFN 128 - CMT-1 Node 9

Mixture Temperoture TMFN 127 - CMT-1 Node 8

Mixture Temperoture

==;---

TMFN 126 - CMT-1 Node 7

Mixture Temperoture TMFN 125 - CMT-1 Node 6

Mixture Temperoture

=

TMFN 124 - CMT-1 Node 5

Mixture Temperoture

==

TMFN 123 - CMT-1 Nede 4

Mixture Temperature TMFN 122 - CMT-1 Node 3

Mixture Temperature TMFN 121

- CMT-1 Node 2

Mixture Temperature TMFN 120 - CMT-1 Node 1 (Bot)

Mixture Temperature 500 7

• • • i Q,=;- (~&33;WM&

3' ifi 'iXW'fffAW i,

MY V

1. ! N 2 W M

/---

0 0

1000 2000 3000 4000 Time (s)

Figure 440.339-51

OSU SB23 05 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-2 Temp Profile - 4nd Cold CMT Temps.125% PRHR HT iMFN 66 - CMT-2 Node 4

(Top)

Mixture Temperature

---

TMFN 65 - CMT-2 Node 3

Mixture Temperature TMFN 64 - CMT-2 Node 2

Mixture Temperature TMFN 60 - CMT-2 Node 1

(Bot)

Mixture Temperature 500

^

u-400 v

,' [

a,

/

\\

a 200

/

o_

/

h, '

~

~

0 d'

1000 2000 3000 4000 Iime (s)

Figure 440.339-52 1

OSU SB23 0.5 INCH COLD LEG BREAK CMT NODING STUDY NOTRUMP CMT-2 Temp Profi1e - 20nd Cold CMT Temps.125% PRHR HT TMFN 169 - CMT-2 Node 20 (Top) Mixture Temperature

- - - - TMFW 158 - CMT-2 Node 19 Mixture Temperature

---

TMFN 157 - CMT-2 Node 18 Mixture Temperature

- TMFN 156 - CMT-2 Node 17 Mixture Temperature TMFN 155 - CMT-2 Node 16 Mixture Temperature

-- TMFN 154 - CMT-2 Node 15 Mixture Temperature

- TMFN 153 - CMT-2 Node 14 Mixture Temperoture

-- TMFN 152 - CMT-2 Node 13 Mixture Temperature

---

TMFN 151

- CMT-2 Node 12 Mixture Temperoture TMFN 150 - CMT-2 Node 11 Mixture Temperoture TMFN 149 - CMT-2 Node 10 Mixture Temperature TMFN 148 - CMT-2 Node 9

Mixture Temperature TMFN 147 - CMT-2 Node 8

Mixture Temperature

==

TMFN 146 - CMT-2 Node 7

Mixture Temperature TMFN 145 - CMT-2 Node 6

Mixture Temperature

==

TMFN 144 - CMT-2 Node 5

Mixture Temperature

==: :

TMFN 143 - CMT-2 Node 4

Mixture Temperature TMFN 142 - CMT-2 Node 3

Mixture Temperature TMFN 141

- CMT-2 Node 2

Mixture Temperature TMFN 140 - CMT-2 Node 1

(Bot)

Mixture Temperature 500 7

5" E 6%U-SWW-M 3

if, W < W 'fff]AW E'" 7h'?'-MVM e

n umm-2 0

0 1000 2000 3000 4000 Time (s)

Figure 440.339-53

OSU SB23 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY NOTRUMP CMT-2 Temp Profile - 20nd Nom CMT Temps.125% PRHR HT TMFN 159 - CMT-2 Node 20 (Top) Mixture Temperature

---

TMFN 158 - CMT-2 Node 19 Mixture Temperature

---

TMFN 157 - CMT-2 Node 18 Mixture Temperature

- TMFN 156 - CMT-2 Node 17 Mixture Temperature TMFN 155 - CMT-2 Node 16 Mixture Temperature

-- TMFN 154 - CMT-2 Node 15 Mixture Temperature

- TMFN 153 - CMT-2 Node 14 Mixture Temperature

-- TMFN 152 - CMT-2 Node 13 Mixture Temperature

---

TMFN 151

- CMT-2 Node 12 Mixture Temperature TMEN 150 - CMT-2 Node 11 Mixture Temperature TMFN 149 - CMT-2 Node 10 Mixture Temperature TMFN 148 - CMT-2 Node 9

Mixture Temperature TMFN 147 - CMT-2 Node 8

Mixture Temperature

====

TMFN 146 - CMT-2 Node 7

Mixture Temperature TMFN 145 - CMT-2 Node 6

Mixture Temperature TMFN 144 - CMT-2 Node 5

Mixture Temperature

=: : :

TMFN 143 - CMT-2 Node 4

Mixture Temperature TMFN 142 - CMT-2 Node 3

Mixture Temperature TMFN 141

- CMT-2 Node 2

Mixture Temperature TMFN 140 - CMT-2 Node 1

(Bot)

Mixture Temperature

.500 h ['l} %5, >]5= Qg E

2/i %,'%fffWl%

{$ h?:S MM Y

l 5

l l

l l

l l

l l

l l

l l

l l

l l

0 1000 2000 3000 4000 Time (s)

Figure 440.335-54

OSU SB23 0.5 INCH COLD LEG BREAK

- CMT NODING STUDY NOTRUMP CMT-2 Temp ProfiIe - 20nd Nom CMT Temps. Nom PRHR HT TMFN 159 - CMT-2 Node 20 (Top)

Mixture Temperature

- - TMFN 158 - CMT-2 N o d e~

19 Mixture Temperature

---

TMFN 157 - CMT-2 Node 18 Mixture Temperature

- TMFN 156 - CMT-2 Node 17 Mixture Temperature TMFN 155 - CMT-2 Node 16 Mixture Temperature

--TMFN 154 - CMT-2 Node 15 Mixture Temperature

- TMFN 153 - CMT-2 Node 14 Mixture Temperature

-- TMFN 152 - CMT-2 Node 13 Mixture Temperature

- - - - - - TMFN 151

- CMT-2 Node 12 Mixture Temperature TMFN 150 - CMT-2 Node 11 Mixture Temperature TMFN 149 - CMT-2 Node 10 Mixture Temperature TMFN 148 - CMT-2 Node 9

Mixture Temperature TMFN 147 - CMT-2 Node 8

Mixture Temperoture

=

TMFN 146 - CMT-2 Node 7

Mixture Temperature TMFN 145 - CMT-2 Node 6

Mixture Temperature

=

TMFN 144 - CMT-2 Node 5

Mixture Temperature TMFN 143 - CMT-2 Node 4

Mixture Temperature TMFN 142 - CMT-2 Node 3

Mixture Temperature TMFN 141

- CMT-2 Node 2

Mixture Temperature TMFN 140 - CMT-2 Node 1 (Bot)

Mixture Temperature 500 7

! 63~%W

32~=C"-f2.nd223A 3

i/i: % ' % ffffAVP n h 00 Pf1'G M M

0 O

1000 2000 3000 4000 Time (s)

Figure 440.339-55

1 (a.b.c) l O

1 e

1 t

1 O

1 O

I l

i cm M

M l

O VW c

5-e

.e m

c

)

i t

I l

l

O (a_.b.c) l NLf3 l

cra CC CO.

W 9

o 45 t:uo I

i

e e

(a.b.c)

LO Ion CG CO.

.WC tan

.m

1 o

(a.d.c) l J

1 i

l C3 LO I

et M

73 W

W G) 43

..an.D.

l 4

1 i

l

1 1

l l

(a.b.c)

CO l

crs (M3 (PQ.

W 9

c) 4O tam

'M muum emmma b

e l

l 6

(a.b.c) len CO CG.

TT CJ NM tam I

l t

i i

l l

l l

O O

l

(

(a b.c)

CD l

cm CO CG.

e 54dtas 0-

i l

i 1

I e

(a.b.c)

)

i i

s to I

crs M

M.

e 5-m W

I

{

i i

OSU SB23 0.5 INCH COLD LEG BREAK CMT NODING STUDY Pressurizer Pressure Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Areo NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Area 400

^

o m 300 a

v

. ~~~.

q, 200 13 3

g m

m 100 a) s u

1

's 0

0 1000 2000 3000 4000 Time (s)

Figure 440.339-64

OSU S823 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY ACC-1 Level (Relative to Bottom Tap)

Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Areo

===--

NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Areo

_ 3.5 3-[~=================*=<

-a

.y 52.5 i

f'\\

\\

2

,1 g

'l

}

i

.51.5

'T l

i s

1 i

=

a 5

,'('

i 0

0 1000 2000 3000 4000 Time (s)

Figure 440.339-65

b OSU SB23 0.5 INCH COLD LEG BREAK CMT NODING STUDY ACC-2 Level (Relative to Bottom Top)

Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Area 3.5 3

&= ;u

= = = = = = = = = = = = '

==

[*2.5 Q

\\

.H

\\

' 9)

}

i i

~ 1.5 g

m i

r.,

j

l.<

m i

a i

O i

t i

g 0

^'

0 1000 2000 3000 4000 Time (s)

Figure 440.339-66

OSU SB23 0.5 INCH COLD LEG BREAK - CMT NODING STUDY ADS 1-3 Integrated Total Mass Flow Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT T er.ip s.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Areo

_ 2500 E

o 2000

,' E m

O I

' 1500 fY

~

o e

~

,'.ll 1000

, 1 i

I

.J 500 l

w e

I

_ _ _1 _ __ J __ _ _t _ __ _f _ _ _ _ _ _ L _

__l - __ _1__ _ _ L i u I )l I

I I

I i

1 0

1000 2000 3000 4000 Time (s)

Figure 440.339-67

OSU SB23 0.5 INCH COLD LEG BREAK CMT NODING STUDY Integrated Total Break Moss Flow Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Areo

_ 1000 e

800 O

~

600 v,

Gi S

400 i.

O

~

200 m

O f

~

0 O

1000 2000 3000 4000 Time (s)

Figure 440.339-68

OSU S823 0.5 INCH COLD LEG BREAK CMT N0 DING STUDY SG-1 Pressure Comparison NOTRUMP 4-Node Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Area 360 m

~

340 m

" 320

~

=;=

k

=

300 g

u

[ 280

~

m

~

260 a

~

240 0

1000 2000 3000 4000 Time (s)

Figure 440.339-69

I OSU SB23 0.5 INCH COLD LEG BREAK -

CMT N0 DING STUDY S G Pressure Comparison NOTRUMP 4-ade Cold CMT Temps.

125% PRHR HT Area

---

N O T R U M P 20-Node Cold CMT Temps.

125% PRHR HT Area NOTRUMP 20-Node Nom CMT Temps.

125% PRHR HT Areo NOTRUMP 20-Node Nom CMT Temps.

Nom PRHR HT Area 360 n

S 340

}

w o_

f

~55~__

e 300 Z_- l _=_ =_ 3 _=_ =_

'1 g

u

~

[280 w

[ 260

~

r

~

0 0

1000 2000 3000 4000 Time (S)

Figure 440.339-70

b AP600 2

In CLB In FN 19 Time Step Sensitivity l

Time Step Size Base Timestep f

---

Tight Timestep

[

12E-01 I

1E-01 m

j 8 E-0 2 -

l Q._

o 6E-02 1

o 4 E-0 2 -

l E

l I

c 2 E-0 2 ---

~

j I

O 0

1000 2000 3000 4000 5000 Time (s) i 1

i Figure 440.339-71

AP600 2

In CLB in FN 19 Time Step Sensitivity Pressurizer Pressure Pressure (psia)

Base Timestep

---

Tight Timestep 2500 50

^

^

f Right Scal e

2000 40 i,

m m

b C1_

1500 30 -

v e

o f

L L_

a 1000 20 a

m m

i m

m o

a 500 10 u

m 1

- Left Sca le 1

'+'

0 0

i 0

1000 2000 3000 1000 5000 Time (s)

Figure 440.339-72 t

..m.

m

m..

AP600 2

in CLB In FN 19 Time Step Sensitivity Pressurizer Mixture Level Base Timestep

---

Tight Timestep 100 l

~

80 v

l Y

t

\\

a f

I 40 e

i

=

~

20

s 0

O 1000 2000 3000 4000 5000 Time (s)

Figure 440.339-73

AP600 2

in CLB in FN 19 Time Step Sensitivity CMT-A Level Base Timestep

---

Tight Timestep 55 m

~ 50

~

\\

45 3

E

> 40 a,

\\

35 a3 m

30 2

~

25 d

CEE E

20

~ '

0 1000 2000 3000 4000 5000 Time (s)

Figure 440.339-74 l

AP600 2

in CLB in FN 19 Time Step Sensitivity CMT-B LeveI Base Timestep

---

Tight Timestep 55 n

~

\\

l 50

~

[

45

~

3

(

o

> 40

\\

e

\\

35 o

u 30 2

b p

rid x

25 s

E n

20

~ '

0 1000 2000 3000 4000 5000 Time (s)

Figure 440.339-75

AP600 2

in CL8 In FN 19 Time Step Sensitivity Core Mixture Level Bose Timestep

---

Tight Iimestep 28 m

p ll C 27

~

l

~~

'ln 26 f';1\\

(

a, n

L' 25

,I l

l u

1 a

l 24 x

l l

y 23 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-76

l l

AP600 2

in CLB in FN 19 Time Step Sensitivity Core Average Void Fraction Base Timestep

---

Tight Iimestep 5

[

A t

~

4 v

i

,p n'

ll R l

l i

3---- -Ll O

g I

i

__ l

~-

2 a,

l u

N 3

i N

=

'i I

1 i

l, y

J 0

0 1000 2000 3000 4000 5000 Time (s)

Figure 440.339-77

I i

r r

0 0

0 5

y t

i v

0 i

0 t

0 i

n 4

s s

w e

o S

l F

p 0

e 0) d t

0 s e

S 3(

t 8

a e

7 r

m 9

g e

3 i

e 3

T 0

m0 t

4 n

0i 4

9 0

T e

i 1

2 r

i u

3 g

N-F i

F 1

p n

p e 0

e et l

gt s 0

as e 0

B t

e m 1

L mi S

C T

i T

S t

n D eh I

s g A

ai 2

BT

- ~

~~

- } -

~

~

O 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

0 0

6 0

0 0

0 0

0 P

0 5

0 5

0 5

3 2

2 1

1 A

o v $ ~ u.

ra ]uca) ~ C-n

~

)

AP600 2

in CLB in FN 19 Time Step Sensitivity ADS Stage

'4 Integrated. Flows Base Timestep

---

Tight Timestep i

250000 E

_a 200000 v

5c o

- 150000 o

o 100000 i

O 50000 a3 f

W

~

0 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-79

~~

AP600 2

in CL8 in FN 19 Time Step Sensitivity Integrated Break Flow Base Timestep

---

Tight Timestep 350000 300000

~

f

/

250000

[

o 200000

] 150000 l

~

100000 cn l

1 50000 [

c 0

0 1000 2000 3000 4000 5000 Time (s)

Figure 440.339-80 r

AP600 2

In CLB In FN 19 Time Step Sensitivity NOTRUMP CMT A

Temperature Profile Base Timestep (56)

Base Timestep (55)

Base Timestep (54)

---

Base Timestep (50)

Tight Timestep (56)

-- Tight Timestep (55)

-Tight Timestep (54)

-- T i g h t Timestep (50)

_ 600 w

U 500 I

5 t

=

l d400

}

1

~

f

^Q l

30*

/

V E

F

/

~ 200 100 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-81

a AP600 2

In CLB in FN 19 Time Step Sensir-ivity NOTRUMP CMT B

Temperature Profile Base Timestep (66)

---

Base Timestep (65)

Base Timestep (64)

---

Base Timestep (60)

Tight Timestep (66)

Tight Timestep (65)

- Tight Timestep (64)

-- T i g h t Timestep (60) 600 m

m

~ 500 I

A h

3 400 i 1

[

~

300 2

f 7

\\

~

E F

/

~ 200 100 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-82

e a

AP600 2

in CLB In FN 19 Time Step Sensitivity s

Steam Generator Pressures Base Timestep SG-A

---

Base Timestep SG-B Tight Timestep SG-A

---

T i.g h t Timestep SG-B 1150 l

1100

^

.a x_ ____

a

] 1050 o_ 1000 v

o 950 u

900 m

850 m

L 800 o_

r 750 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-83 i

V m

e i

AP600 2

in CLB in FN 19 Time Step Sensitivity Total DVI Line A

Flow

-- B a s e Timestep

---

Tight Timestep 400 m

i

~

G 300

~

/

a3 w

I N

200 I

E

_O I

l

[

~

I 100 l

N M

2

~

3::

^

o ll

~

' l 9

+=

[

Lt.

~

-100 O

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-84 m

AP600 2

In CLB In FN 19 Time Step Sensitivity Total DVI Line B

Flow Base Timestep

---

Tight Timestep 350 300 I' k

[l q

" 250

~

o f

en i

N 200 f

I E

i l

150

~

l 100 t

1 N

l i

50 I

E

^ ^^

j c

u_

i I

E 0

-50 0

1000 2000 3000 4000 5000 Time (s)

Figure 440.339-85

-