ML21287A649
| ML21287A649 | |
| Person / Time | |
|---|---|
| Issue date: | 09/21/2021 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | |
| Abdullahi, Z, ACRS | |
| References | |
| NRC-1678 | |
| Download: ML21287A649 (49) | |
Text
Official Transcript of Proceedings NUCLEAR REGULATORY COMMISSION
Title:
Advisory Committee on Reactor Safeguards Thermal-Hydraulic and Metallurgy and Reactor Fuels Subcommittees Docket Number: (n/a)
Location: teleconference Date: Tuesday, September 21, 2021 Work Order No.: NRC-1678 Pages 1-30 NEAL R. GROSS AND CO., INC.
Court Reporters and Transcribers 1716 14th Street, N.W., Suite 200 Washington, D.C. 20009 (202) 234-4433
1 1
2 3
4 DISCLAIMER 5
6 7 UNITED STATES NUCLEAR REGULATORY COMMISSIONS 8 ADVISORY COMMITTEE ON REACTOR SAFEGUARDS 9
10 11 The contents of this transcript of the 12 proceeding of the United States Nuclear Regulatory 13 Commission Advisory Committee on Reactor Safeguards, 14 as reported herein, is a record of the discussions 15 recorded at the meeting.
16 17 This transcript has not been reviewed, 18 corrected, and edited, and it may contain 19 inaccuracies.
20 21 22 23 NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1323 RHODE ISLAND AVE., N.W.
(202) 234-4433 WASHINGTON, D.C. 20005-3701 www.nealrgross.com
1 1 UNITED STATES OF AMERICA 2 NUCLEAR REGULATORY COMMISSION 3 + + + + +
4 ADVISORY COMMITTEE ON REACTOR SAFEGUARDS 5 (ACRS) 6 + + + + +
7 THERMAL-HYDRAULIC SUBCOMMITTEE 8 AND 9 METALLURGY AND REACTOR FUELS SUBCOMMITTEE 10 + + + + +
11 TUESDAY 12 SEPTEMBER 21, 2021 13 + + + + +
14 The Joint Subcommittee meeting was 15 convened via Videoconference, at 2:00 p.m. EDT, Jose 16 March-Leuba, Chair, presiding.
17 18 COMMITTEE MEMBERS:
19 JOSE MARCH-LEUBA, Chair 20 RONALD G. BALLINGER, Member 21 CHARLES H. BROWN, JR. Member 22 GREGORY H. HALNON, Member 23 DAVID A. PETTI, Member 24 JOY L. REMPE, Member 25 MATTHEW W. SUNSERI, Member NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
2 1 DESIGNATED FEDERAL OFFICIAL:
2 ZENA ABDULLAHI 3
4 5
6 7
8 9
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3 1 AGENDA 2 Chairman Introductory Remarks . . . . . . . . . . 4 3 NRC Staff Introductory Remarks . . . . . . . . . 6 4 Framatome Staff Introductory Remarks . . . . . . 7 5 Framatome TR GALILEO Implementation 6 in LOCA Methods . . . . . . . . . . . . . . . . 9 7 NRC Staff TR GALILEO Implementation 8 in LOCA Methods . . . . . . . . . . . . . . . . 16 9
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4 1 P R O C E E D I N G S 2 2:00 p.m.
3 CHAIR MARCH-LEUBA: So the meeting will 4 now come to order. This is a joint meeting of the 5 ACRS Thermal-Hydraulics and the Metallurgy and Reactor 6 Fuel Subcommittees. I am Jose March-Leuba, the 7 Chairman of the Thermal-Hydraulics Committee.
8 Because of COVID-19 concerns, this meeting 9 is being conducted remotely. Members in attendance 10 are Ron Ballinger, Charlie Brown, Greg Halnon, Dave 11 Petti, Joy Rempe, and Matt Sunseri. Has anybody else 12 logged in recently? Maybe they'll come later.
13 Today's topic is Framatome's Topical 14 Report ANP-10349P, Revision 0, entitled GALILEO 15 Implementation in LOCA Methods.
16 In November 2020, we wrote a letter for a 17 different report, ANP-10323P, which relates to 18 Framatome's fuel rod thermal-mechanical methodology 19 for non-LOCA events. So this review of the LOCA 20 methodology completes the GALILEO fuel thermal-21 mechanical methodology.
22 Portions of our meeting will be closed to 23 the public to protect proprietary information. We 24 will have an ongoing, an opportunity for public 25 comments before we start the closed session of the NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
5 1 meeting.
2 The ACRS was established by a statute and 3 is governed by the Federal Advisory Committee Act, 4 FACA. As such, the Committee can only speak through 5 its published letter reports. Any comments raised by 6 members today are their individual opinions.
7 The ACRS section of the U.S. NRC public 8 website provides our charter, bylaws, agendas, letter 9 reports, and full transcripts for the open portions of 10 all full and subcommittee meetings, including the 11 slides presented here.
12 The designated federal official today is 13 Zena Abdullahi.
14 A transcript of the meeting is being kept; 15 therefore, speak clearly and state your name for the 16 benefit of the court reporter. Please keep the 17 microphone on mute when not in use and don't use video 18 feed to minimize bandwidth problems.
19 Note that we have scheduled a full 20 committee meeting in early October to write a letter 21 on this topic.
22 Member Ballinger, since you are the co-23 chair of this subcommittee, did you want to add 24 something to the intro remarks? Ron? We may have 25 lost him.
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6 1 MEMBER BALLINGER: No, I think I'm fine.
2 I actually have two screens with Team on it, one that 3 works and one that doesn't. So --
4 (Laughter.)
5 CHAIR MARCH-LEUBA: Okay. Let's keep 6 going, because my next paragraph says that I know that 7 both the staff and Framatome have a large number of 8 slides in the closed session. Please don't read every 9 bullet and try to address the main points because 10 we're scheduled to finish in three hours. The slides 11 are part of the official record, and they speak for 12 themselves.
13 At this point, let's request Ngola Otto 14 from the NRC staff to make the introductory remarks.
15 Ngola?
16 MR. OTTO: All right. Thank you. Good 17 afternoon, Subcommittee Chair and Subcommittee Members 18 and staff. I'm Ngola Otto. I'm the project manager 19 for the Framatome Topical Report Review. And I work 20 in the Office of Nuclear Reactor Regulation.
21 And presenting today for the staff will be 22 Matthew Panicker, who is a technical reviewer. And 23 he's going to do both the open and the closed session 24 presentation.
25 I would just like to thank you for the NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
7 1 opportunity to present the review of Framatome Topical 2 Report ANP-10349 and the NRC staff evaluation of, 3 review of the, staff evaluation, including a review of 4 GALILEO fuel performance code in S-RELAP and in 5 realistic large-break LOCA and small-break LOCA 6 evaluation models.
7 The staff's draft safety evaluation was 8 issued in August and contains no open items. And we 9 plan to issue the final safety evaluation by the end 10 of October.
11 We look forward to today's meeting, which 12 supports the ACRS review. And we're just, we want to 13 say thank you for the opportunity to present.
14 And at the end of your review process, we 15 definitely would be, expect the letters similar to the 16 letter that we got for the GALILEO topical report 17 review. So thank you. I'll turn it back over.
18 CHAIR MARCH-LEUBA: Thank you, Ngola. So, 19 at this point, we'll give the floor to Framatome. I 20 believe we have some introductory remarks by Morris 21 Byram.
22 MR. BYRAM: Yes, this is Morris Byram.
23 Good afternoon. I'm product manager for the topical 24 report implementation of GALILEO and Framatome's LOCA 25 evaluation models. We're happy to be here today with NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
8 1 the ACRS subcommittee to support your review.
2 This topical is one of many of the 3 Framatome advanced fuel methods, many of which have 4 been approved or almost approved. This and the other 5 AFM codes will support the industry's need to move 6 higher, move to higher enrichments and higher fuel 7 burnups.
8 It's been good to see some of the ACRS 9 members engaging in many of our pre-submittal meetings 10 with the NRC of the AFM efforts. And so we look 11 forward to the future engagements with ACRS on the 12 Framatome advanced fuel methods.
13 Andrei Burghelea will be our presenter for 14 both the open and closed sessions today.
15 CHAIR MARCH-LEUBA: Is Andrei going to be 16 sharing the screen?
17 MR. BYRAM: I think that Ngola is going to 18 present the slides.
19 CHAIR MARCH-LEUBA: Okay.
20 MR. OTTO: I'll go ahead and share right 21 now. Please let me know if you can see the split 22 screen.
23 CHAIR MARCH-LEUBA: Not yet. Yes, I can 24 see the screen now.
25 MR. OTTO: Okay.
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9 1 MR. BYRAM: I can see them. Andrei, are 2 you good? I think maybe Andrei is on mute.
3 MR. BURGHELEA: Can you hear me now?
4 MR. BYRAM: Yes.
5 MR. BURGHELEA: All right. Yes, we can 6 see the slides. Thank you.
7 MR. BYRAM: Okay. Great.
8 MR. OTTO: Your volume is a little low 9 from where I am.
10 MR. BURGHELEA: Let's see. Is this 11 better?
12 CHAIR MARCH-LEUBA: Yes, much better.
13 MR. BURGHELEA: Okay. Thank you.
14 MR. BYRAM: Ngola, are we ready for Andrei 15 to start presenting?
16 MR. OTTO: Yes, if he can.
17 MR. BURGHELEA: Okay. I'll go ahead then.
18 My name is Andrei Burghelea. I'm an engineer with the 19 LOCA group at Framatome.
20 This is the open session of our 21 presentation on the GALILEO implementation in LOCA 22 methods. Next slide, please, Ngola.
23 So, in terms of content, I'm going to go 24 briefly over a topical report overview, an 25 introduction and background, and implementation of NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
10 1 small-break LOCA and large-break LOCA methods, and the 2 summary. Next slide.
3 So, for introduction, in the current LOCA 4 methods, we have two approved methods, one for small-5 break, one for large-break.
6 The small-break LOCA is the EMF-2328, 7 approved a long time ago, which has been recently 8 supplemented with Supplement 1PA in December 2016. It 9 is based on RODEX2 as a fuel performance code and is 10 10 CFR 50, Appendix K type of method, so it's a 11 conservative method.
12 The large-break LOCA model is the 13 realistic large-break LOCA based on EMF-2103P, 14 Revision 3, approved in June of 2016. The current 15 fuel performance code in this evaluation model is 16 COPERNIC. And it is a realistic or best-estimate 17 Plasma 17 (phonetic) method --
18 CHAIR MARCH-LEUBA: Andrei, sorry, sorry 19 to interrupt you at this moment. The approval of 20 RODEX2 and COPERNIC, is that part of the EMF-2328 and 21 2103? Is that what that --
22 MR. BURGHELEA: No, no, they are, they do 23 have distinct topical reports that are separate from 24 the two. This is just for the LOCA methods. So 25 RODEX2 has an X and an F topical report that's even NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
11 1 older than 2001. And COPERNIC2 has a different 2 topical report separate. I can't remember the number, 3 but yeah.
4 CHAIR MARCH-LEUBA: So, when we issue a 5 topical, the topical report, 10349, the approved 6 version with the SER, that will be attached to the EMF 7 reports for LOCA? I mean, that will be an applicable?
8 MR. BURGHELEA: Correct. So the purpose 9 of this is to add GALILEO to LOCA methods and to 10 supplement the two existing methods, the realistic 11 large-break and the small-break LOCA EM, to include 12 GALILEO. So this topical report would be a supplement 13 to both EMF-2328 and EMF-2103, Revision 3.
14 CHAIR MARCH-LEUBA: So a licensee that 15 commissions you to perform a LOCA calculation can 16 choose to use RODEX2 or GALILEO? I mean, both will be 17 applicable.
18 MR. BURGHELEA: Technically --
19 CHAIR MARCH-LEUBA: It doesn't replace.
20 MR. BURGHELEA: Yes, technically the old 21 topical report will remain active. I think the main 22 goal of ours is to push towards adopting GALILEO in 23 all the new applications that we will be making from 24 now on. And at some point, obviously, RODEX2 will 25 become obsolete.
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12 1 CHAIR MARCH-LEUBA: Okay. Thank you.
2 MR. BURGHELEA: Okay. And just briefly, 3 to mention again, so both methods are based on, are 4 approved for working with three loop and four loop 5 plants and combustion engineering plants. So they 6 apply potentially only to bottom reflood plants only.
7 And the GALILEO topical report was 8 mentioned before, was recently approved in November of 9 2020, is ANP-10323P, Revision 1. Next slide, please, 10 Ngola.
11 So, for the small-break LOCA portion of 12 the topical report, the regulatory requirements we 13 take into consideration are NUREG-0800 and Appendix K 14 of 10 CFR 50.
15 The EM requirements described in the 16 topical report include the analysis, purpose, 17 transient class, power plant class, the figures of 18 merit.
19 And in deriving the assessment database, 20 because this is a fuel performance code, the only LOCA 21 test that we have to include nuclear fuel is actually 22 the LOFT series of tests.
23 So, for small-break LOCA, we included the 24 L3-6, L8-1 sequence of tests. And those were 25 previously part of Supplement 1 to the EMF-2328.
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13 1 We also describe in the small-break LOCA 2 topical report the EMF changes, provide the results of 3 the assessment for the LOFT small-break LOCA tests 4 that we mentioned. And we provide a sample problem to 5 demonstrate how the method behaves with GALILEO in 6 comparison with the previous code RODEX2. Okay. Next 7 slide, please.
8 The large-break LOCA portion of the 9 topical report is very similar in structure. The 10 regulatory requirements are similar, just add the Reg 11 Guide 1.157 (audio interference). And because of the 12 relative (audio interference). Okay.
13 CHAIR MARCH-LEUBA: Andrei, you can keep 14 going.
15 (Audio interference.)
16 MR. BURGHELEA: Can you hear me?
17 CHAIR MARCH-LEUBA: We hear you -- yes, 18 now we can hear you.
19 MR. OTTO: Yes.
20 MR. BURGHELEA: Okay. Thank you. Sorry 21 about that.
22 So the realistic large-break LOCA section 23 of the topical report is very similar, slightly 24 different regulatory requirements. There are two 25 additional regulatory guides which apply to this NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
14 1 method, 1.157 and 1.203.
2 And 1.203 give us a graded approach to the 3 evaluation model development and assessment process 4 that we applied for this supplement of the topical 5 report given the low complexity of the implementation, 6 also, the same EM requirements, as we saw before for 7 the small-break that are described in the topical 8 report, and again, the assessment phase includes the 9 series of LOFT large-break tests, the L2-3, L2-5, LP-10 026, and LP-LB-1. Also, again, these test were 11 previously included in EMF-2103, Rev. 3.
12 The topical report describes the 13 evaluation model changes due to the GALILEO 14 implementation and provides the results of the LOFT 15 large-break LOCA tests mentioned above. And we also 16 provide a demonstration sample problem. Okay. Next 17 slide, please.
18 So, in summary, this is a fairly 19 straightforward process in replacing COPERNIC or 20 RODEX2 with GALILEO, which is an acceptable fuel 21 performance code.
22 It's an EM evolution that adds one fuel 23 performance code with the same functionality to the 24 current methods. You will see that the analysis 25 workflow remains unchanged for both methods.
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15 1 The assessments against the benchmarks 2 show good results. And again, the comparison to 3 current approved methods show good agreement.
4 CHAIR MARCH-LEUBA: This question might be 5 more appropriate for the closed session. But does the 6 COPERNIC RODEX methodology update fuel properties as 7 a function of time?
8 MR. BURGHELEA: Function of time --
9 CHAIR MARCH-LEUBA: Just say if you want 10 to address it in closed. Yes.
11 MR. BURGHELEA: Yes, they do. It's 12 calculated dynamically during the transient, yes. And 13 --
14 CHAIR MARCH-LEUBA: Okay.
15 MR. BURGHELEA: Yeah.
16 CHAIR MARCH-LEUBA: Thank you. Thank you.
17 So, Andrei, are you finished with your presentation?
18 MR. BURGHELEA: Yes, I think so. If you 19 go to the next slide, I think that was about it for 20 the open session. There's some acronyms that we used 21 in the slides before, yeah.
22 CHAIR MARCH-LEUBA: Members, any questions 23 for the open session of the Framatome presentation?
24 Okay. I'll take that as a no. Is the staff ready 25 for, to present their open session?
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16 1 MR. OTTO: I'll stop sharing. And I'll 2 switch to the other slides. Are you ready, Matthew?
3 MR. PANICKER: Yes.
4 MR. OTTO: Okay. Let me -- so you can go 5 ahead and present whenever you're ready, Matthew.
6 MR. PANICKER: Okay --
7 CHAIR MARCH-LEUBA: We still cannot see 8 the slides. But, Matthew, you can start with your 9 introduction.
10 MR. PANICKER: Yeah --
11 MR. OTTO: So you can't see the slides as 12 yet?
13 CHAIR MARCH-LEUBA: I cannot.
14 MR. PANICKER: I cannot see any.
15 MR. OTTO: Oh, okay. Let me -- sorry. I 16 apologize.
17 CHAIR MARCH-LEUBA: Now, now we see.
18 Okay.
19 MR. PANICKER: Yeah, this is the NRC 20 staff's evaluation of Framatome Topical Report ANP-21 10349 where GALILEO replaces the old methods in 22 realistic large-break LOCA, as well as in the small-23 break LOCA. Next slide, please.
24 This is an outline we have from the staff, 25 some background, regulatory evaluation of GALILEO as NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
17 1 implemented in S-RELAP5 and thereby use it for that 2 LOCA analysis, and then GALILEO implementation also in 3 S-RELAP5, which is the thermal-hydraulics code used 4 for small-break LOCA methodology, and then a slide 5 regarding the revision.
6 Actually, the process involves reality of 7 349P topical report and then reality of virtual audit, 8 as well as RAs, the virtual audit enabled us to look 9 at all the documents for considering a longer period 10 than an in-person audit. Next slide, please.
11 So, as was said before, the EMF-2103, 12 Revision 3, the latest version of realistic large-13 break LOCA analysis used a combination of S-RELAP5 and 14 COPERNIC, which is the previous generation of fuel 15 performance code for initialization conditions and 16 also for thermal-hydraulics analysis.
17 And a small-break LOCA, which is the 18 approved EMF-2328, and its supplements used S-RELAP5, 19 RODEX2 combination for initialization conditions for 20 the thermal-hydraulics code.
21 In 2020, staff approved a modern fuel 22 performance code, which is the GALILEO code, which is 23 in ANP-10323, Revision 1. The GALILEO code models the 24 thermal mechanical area of the fuel rods during normal 25 operation and transient scenarios.
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18 1 This has a regulatory, the basis for the 2 review with respect to the regulatory aspects, 10 CFR 3 50.46, the acceptance criteria for ECCS, which is a 4 limit term, basically, limit term, high generation 5 (phonetic), as well as the chemical reaction.
6 Part 50A also is the basis for us 7 calculating UVC35 (phonetic). Chapter 6.3, cooling 8 system of the SRP is used as a guidance for the 9 review. Chapter 15.6.5 of the SRP for loss of coolant 10 accidents provides the guidance of portfolio reviews.
11 In summary, the GALILEO implementation is 12 in S-RELAP5 and large-break LOCA events. The 13 regulatory replaces COPERNIC in realistic large-break 14 LOCA analysis for S-RELAP5 thermal-hydraulics fuel and 15 t-h conditions.
16 The LOFT, in support of the LOFT tests 17 used to assess the basis, base of the supplemental 18 large-break LOCA evaluation model and benchmarked 19 using coupled S-RELAP5/GALILEO.
20 Similar, and a similar, and a sample 21 problem similar to the one used originally in 2103 has 22 been repeated to prove that the results coming from 23 use of GALILEO is the same as, almost the same as the 24 one from COPERNIC.
25 The results of the LOFT tests and sample NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
19 1 problem indicate reasonable agreement. And we can see 2 that in the closed session. The next one, please.
3 GALILEO replaces in the small-break LOCA 4 analysis the RODEX2 with GALILEO for t-h calculations.
5 Also, in order to prove the 6 reproducibility of results, the LOFT tests were used 7 to assess the base for the supplemental small-break 8 LOCA. The supplemental small-break LOCA EM result is 9 in the 10349 benchmarked using the coupled S-10 RELAP5/GALILEO.
11 A sample problem was, again, used to prove 12 the reproducibility of results. Both LOFT tests and 13 sample problems indicate reasonable agreement between, 14 when GALILEO is used and when RODEX2.
15 So some of the staff's recommendations 16 are, we reviewed the process and the results from 17 supplemental evaluation model for both large-break 18 LOCA and small-break LOCA replacing COPERNIC and 19 RODEX2. Both LOFT test results and the sample problem 20 results show there is a reasonable agreement between 21 GALILEO and the two conditions.
22 CHAIR MARCH-LEUBA: Matthew, if I can 23 interrupt you here, I want to make a couple points.
24 The first one is a minor thing of language. When I 25 read the SER conclusions and your presentation, you NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
20 1 keep saying that GALILEO replaces RODEX2 and COPERNIC.
2 MR. PANICKER: Yes.
3 CHAIR MARCH-LEUBA: And that is the intent 4 of Framatome, to replace it. But in reality, it 5 doesn't replace them. It supplements. They keep the 6 option of using either of the three codes in the 7 future.
8 MR. PANICKER: Yes.
9 CHAIR MARCH-LEUBA: So, if I may 10 recommend, and maybe I'll remind you later, the SER 11 language should be more specific, because it clearly 12 says it -- I mean, you are speaking on slide number 6.
13 GALILEO code replaces RODEX2. It doesn't. When we 14 write SERs, we need to be a little more specific of 15 what we're doing --
16 MR. PANICKER: Okay.
17 CHAIR MARCH-LEUBA: -- and what we're 18 approving. And this is just language. Okay.
19 Now, a more important, a more relevant 20 comment, and this is a comment, not a question, is the 21 fact that we keep doing what I call a code to code 22 comparison. We are comparing the GALILEO results with 23 RODEX results and GALILEO results with COPERNIC 24 results.
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21 1 word. I mean, this is a four-letter word. We should 2 never approve them. We never like them.
3 In reality, what Framatome has done is 4 compared it against the LOFT tests. And that's --
5 MR. PANICKER: Yes.
6 CHAIR MARCH-LEUBA: -- what makes these 7 validation acceptable.
8 My concern is creating a precedent for the 9 future with this language. Here we don't have 10 absolutely any problem.
11 But we are in the process of reviewing a 12 large number of advanced reactors with modern fuels, 13 things that don't really have a significant 14 experimental database.
15 And if we start kind of approving code to 16 code comparisons, we're opening ourselves to somebody 17 coming up with a sophisticated Monte Carlo analysis 18 and use that Monte Carlo analysis to validate 19 mandatory methods which are simpler, or same thing 20 with thermal-hydraulics.
21 Somebody does a CFV analysis, which is 22 very sophisticated and very good quality, and uses to 23 validate my analysis code. That would be 100 percent 24 code to code comparison and in my opinion would not be 25 good.
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22 1 So I would like that we emphasize the fact 2 that the benchmark and the reason we are accepting 3 GALILEO is because it reproduces the LOFT experimental 4 data.
5 MR. PANICKER: Yes.
6 CHAIR MARCH-LEUBA: The RODEX and the 7 COPERNIC calculations that show the same thing adds 8 icing to the cake. But it's not sufficient.
9 So I would like that we don't create a 10 precedent, that we keep an opening to an advanced 11 reactor to use code to code benchmarks. Okay. So --
12 MR. PANICKER: Okay. But they have the 13 same codes. They use two different techniques to 14 validate the results, right --
15 CHAIR MARCH-LEUBA: Yeah, but at the end 16 we are comparing against experimental data. And we 17 need to emphasize -- it may not be possible always, 18 but whenever possible --
19 MR. PANICKER: Yeah.
20 CHAIR MARCH-LEUBA: -- or, I mean, I'm 21 tending to say always you should use experimental data 22 to validate your fuels.
23 MR. PANICKER: Okay. All right.
24 CHAIR MARCH-LEUBA: All right. Keep 25 going.
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23 1 MR. PANICKER: So the --
2 MR. LUKES: Matthew, may I interrupt?
3 This is Bob Lukes, the branch chief for the Nuclear 4 Fuels and Methods branch.
5 Jose, I just want to say thank you for the 6 comment. And I'll take that comment back to the 7 branch and make sure -- I agree with the comment. And 8 I'll just make sure that that information is 9 distributed to the fuels branch so they can make sure 10 we address that in all of our reviews. Again, thanks, 11 Jose. I appreciate it.
12 CHAIR MARCH-LEUBA: Yeah, thanks.
13 MR. PANICKER: Okay. All right. The last 14 bullet there is -- the next slide, please, Ngola.
15 Yeah, the last slide is the Framatome 16 shall publish the approved version of ANP-10349P as a 17 supplemental topical report to the final approved 18 versions of 2103 and 2328.
19 But I just heard that the Framatome 20 personnel said that they will have the option of using 21 also the COPERNIC and RODEX2 for -- but this is a 22 supplemental clear (phonetic). So, if any of your 23 licensee wants to use this, they are to use this TR, 24 as well as the two previously approved topical 25 reports.
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24 1 So that's all my presentation is in the 2 open session.
3 CHAIR MARCH-LEUBA: Yeah, let me, since we 4 are still in the open session, let me give you another 5 comment.
6 Yeah, there are two topical reports that 7 have the GALILEO name on them. The one we are 8 listening to today is what I call the LOCA topical 9 report. The one we addressed last year is what I call 10 the non-LOCA. And so I'm giving you the numbers. One 11 is 10323P. But I call it a non-LOCA. Okay.
12 In the non-LOCA topical report in the SER, 13 there was actually three sections which address the 14 code applicability ranges. And in limited conditions 15 can offset, you can only apply GALILEO in this 16 applicability range.
17 On the LOCA report that we've reviewed 18 today, I don't see the SER addressing the code 19 applicability ranges. I would love to see it at least 20 included by reference on the current topical report, 21 say the applicability ranges that are applicable for 22 the non-LOCA topical report are applicable to LOCA 23 also, or not, I mean, whatever they are. But we need 24 to address.
25 For example, we know that it only applies NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
25 1 to Westinghouse and CE plants because of the bottom 2 refueling (phonetic). We know that other plants to, 3 it applies to M5 and Z2 cladding.
4 That should really be specified on the SCI 5 in my opinion. What do you think? And it could be 6 just by reference, say the same code applicability 7 ranges that were applicable for the non-LOCA topical 8 report apply here. It's only one sentence.
9 MR. PANICKER: Okay --
10 CHAIR MARCH-LEUBA: Just a suggestion.
11 And this might be a -- go ahead.
12 MR. PANICKER: The code applicability is 13 only for the fuel and the M5 cladding?
14 CHAIR MARCH-LEUBA: On the review of 15 10323P, there was a number of code applicability. And 16 it's, there are three sections, 1.1, 1.2, and 4 if I 17 remember correctly. And I won't read them to you now 18 because I won't be able to find it.
19 But if you review the old SER, the non-20 LOCA SER, November 2020, you will find those 21 applicability ranges. And --
22 MR. PANICKER: What is the system of codes 23 used there --
24 CHAIR MARCH-LEUBA: Say again.
25 MR. PANICKER: What is the system of codes NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
26 1 used in the non-LOCA --
2 CHAIR MARCH-LEUBA: Oh, it's the same as 3 S-RELAP and GALILEO, yeah.
4 MR. PANICKER: Okay.
5 CHAIR MARCH-LEUBA: It's -- sorry. S-6 RELAP and GALILEO is only that it applies for all the 7 transients that are not LOCA.
8 MR. PANICKER: Okay, yeah.
9 CHAIR MARCH-LEUBA: And my question to you 10 is, what are the code applicability ranges for the 11 LOCA portion of the GALILEO/S-RELAP5 use? My 12 suspicion is they're the same and wouldn't really 13 happen.
14 MR. PANICKER: Yeah, we'll have to check 15 on that one.
16 CHAIR MARCH-LEUBA: Yeah, I think a good 17 SER should have those limitations.
18 MR. PANICKER: Okay.
19 MR. BURGHELEA: If I may, this is Andrei 20 Burghelea.
21 CHAIR MARCH-LEUBA: Yes.
22 MR. BURGHELEA: I just wanted to add that 23 the 10323 GALILEO topical report is not actually a 24 non-LOCA. It's a thermal mechanical analysis.
25 MR. PANICKER: Yes.
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27 1 MR. BURGHELEA: And, yes, and non-LOCA is 2 a separate topical report. I don't know if it uses 3 GALILEO or not. But it's not the same with 323.
4 MR. PANICKER: Yes, 10323 is GALILEO. And 5 the other one is one of our reviewers reviewed it.
6 But I don't know about the computer for what -- what 7 about the use of (unintelligible).
8 CHAIR MARCH-LEUBA: Yes. Something like 9 that I remember. But we're not reviewing that yet.
10 MR. PANICKER: So you think the range of 11 applicability for non-LOCA, is it not slightly 12 different or is it the same as LOCA range of 13 applicability?
14 CHAIR MARCH-LEUBA: I'm asking you if the 15 fuel for thermal mechanical code, the topical report, 16 the 10323P --
17 MR. PANICKER: Yes.
18 CHAIR MARCH-LEUBA: -- has some range for 19 applicability --
20 (Simultaneous speaking.)
21 MR. PANICKER: I agree that, no, I agree 22 to that one, yeah.
23 CHAIR MARCH-LEUBA: Yeah. Our evaluation 24 of this topical report is begging for a range of 25 applicability.
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28 1 MR. PANICKER: Okay. I will --
2 (Simultaneous speaking.)
3 MR. PANICKER: I will check the range of 4 applicability for GALILEO in regard --
5 (Simultaneous speaking.)
6 MR. PANICKER: -- and then look at the 7 Framatome LOCA range of applicability and see where 8 they agree or if they don't agree, I will put an 9 appropriate sentence or sentences in the SER.
10 CHAIR MARCH-LEUBA: Yeah.
11 MR. PANICKER: That's what --
12 CHAIR MARCH-LEUBA: You may have to get on 13 the phone with Framatome or --
14 MR. PANICKER: Yes.
15 CHAIR MARCH-LEUBA: I mean, it doesn't 16 deserve an audit. But certainly -- or even an II.
17 But get on the phone and say where can I find this 18 range of applicability. And they'll let you know.
19 MR. PANICKER: It should be in the EMF-20 2103 final approved version and also EMF --
21 CHAIR MARCH-LEUBA: See, on 10323 it has 22 three sections with the ranges of applicability.
23 MR. PANICKER: Right.
24 CHAIR MARCH-LEUBA: But you have to make 25 sure they are applicable to the 349 that we're doing NEAL R. GROSS COURT REPORTERS AND TRANSCRIBERS 1716 14th STREET, N.W., SUITE 200 (202) 234-4433 WASHINGTON, D.C. 20009-4309 www.nealrgross.com
29 1 now.
2 And while we're talking about this and we 3 have Andrei also on the phone -- and please tell me if 4 we need to move to the closed session for this 5 question. We keep mentioning that one of the big 6 advantages of GALILEO is to go to higher enrichments 7 and burnup. Do we have any validation for that? I 8 haven't seen it. Maybe we can talk about this in the 9 closed session.
10 MR. BURGHELEA: Yes, that would be the 11 most appropriate.
12 CHAIR MARCH-LEUBA: Okay. So, Matthew, 13 are you finished with your presentation?
14 MR. PANICKER: Yeah, that's all. That's 15 it.
16 CHAIR MARCH-LEUBA: Okay. Thank you. So 17 this concludes the open session of this meeting. And 18 we are going to be moving to a closed session to 19 discuss proprietary information.
20 Any members has a question in the open 21 session for either Framatome or the staff?
22 Hearing none, I would like to open the 23 floor to members of the public. Anybody attending the 24 meeting with, via Teams, you can just unmute yourself 25 and make a comment.
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30 1 Hearing none, if you are using the phone 2 to connect, you will have to push star 6 to unmute 3 yourself and make a comment.
4 I don't hear any comments from anybody.
5 So we will be in recess on this session. And we will 6 not come back to this Teams session. We will complete 7 the subcommittee on the closed session.
8 Now, I would like to ask everybody to move 9 to the closed session phone number or Teams invite 10 immediately so we can start the process of unmuting 11 people that have a need to know into that session. So 12 please do it now. And then we will take a 15-minute 13 break to 5 till 3:00 Eastern Time.
14 So connect to the new session. Let's 15 start the process. And we will restart at 2:55 16 Eastern Time. So we are on recess.
17 (Whereupon, the above-entitled matter went 18 off the record at 2:39 p.m.)
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GALILEO Implementation in LOCA Methods (ACRS SC Open Session)
Andrei Burghelea 09/21/2021
CONTENT Introduction and Background SBLOCA RLBLOCA Summary GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 2
Introduction and Background Current LOCA topical reports:
- EMF-2328P-A (March 2001) and EMF-2328 Supplement 1P-A (December 2016)
- Current fuel performance code - RODEX2
- RLBLOCA
- EMF-2103P-A Revision 3 (June 2016)
- Current fuel performance code - COPERNIC
- Realistic Applicable to Westinghouse (3 and 4 loop) and Combustion Engineering plants Purpose of new topical report is to add the fuel performance code GALILEO to LOCA methods
- ANP-10323P-A Revision 1 (November 2020)
- Support future Framatome objectives (addressed separately) o Increased enrichment and burnup o Chromia-doped fuel and Chromium coated cladding GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 3
SBLOCA Regulatory Requirements
- 10 CFR 50 Appendix K EM Requirements
- Analysis purpose, transient class, power plant class
- Figures of merit Assessment Data Base
- Only LOFT tests include nuclear fuel
- LOFT Small Break Tests L3-6 / L8-1 EM Changes Assessment Results for LOFT Small Break Tests L3-6 / L8-1 Sample Problem GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 4
RLBLOCA Regulatory Requirements
- Analysis purpose, transient class, power plant class
- Figures of merit
- PIRT Review Assessment Base
- Only LOFT tests include nuclear fuel
- LOFT L2-3, L2-5, LP-02-6 and LP-LB-1 EM Changes Assessment of LOFT LBLOCA Tests L2-3, L2-5, LP-02-6 and LP-LB-1 Sample Problem GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 5
Summary Straight forward process COPERNIC/RODEX2 GALILEO an acceptable FPC EM evolution adding one FPC with the same functionality current methods Analysis workflow unchanged for both methods Assessments against benchmarks show good results Comparisons to current approved methods show good agreement GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 6
Acronyms EM - Evaluation Model FPC - Fuel Performance Code LOCA - Loss-of-Coolant Accident LOFT - Loss of Fluid Test LBLOCA - Large Break LOCA RLBLOCA - Realistic LBLOCA SBLOCA - Small Break LOCA TR - Topical Report GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 7
Trademarks ARCADIA, AREA, ARITA, COPERNIC, GALILEO, M5Framatome and S-RELAP5 are trademarks or registered trademarks of Framatome or its affiliates, in the USA or other countries.
GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 8
DOE Acknowledgment and Disclaimer Acknowledgment: This material is based upon work supported by the Department of Energy under Award Number DE-NE0008818.
Disclaimer: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 9
Any reproduction, alteration, transmission to any third party or publication in whole or in part of this document and/or its content is prohibited unless Framatome has provided its prior and written consent.
This document and any information it contains shall not be used for any other purpose than the one for which they were provided. Legal action may be taken against any infringer and/or any person breaching the aforementioned obligations.
GALILEO Implementation in LOCA Methods - ACRS Subcommittee Meeting - 09/21/21 10
NRC STAFF EVALUATION OF FRAMATOME TOPICAL REPORT ANP-10349P, REVISION 0, GALILEO IMPLEMENTAION IN LOCA METHODS OPEN SESSION Mathew Panicker Nuclear Methods and Fuel Analysis Branch (NRR/DSS/SNPB)
ACRS Subcommittee Meeting September 21, 2021 1
PRESENTATION OUTLINE
Background
Regulatory Evaluation GALILEO Implementation in S-RELAP5 and RLBLOCA GALILEO Implementation in S-RELAP5 and SBLOCA GALILEO Implementation in LOCA EM - Conclusion 2
BACKGROUND Framatomes Pressurized Water Reactor (PWR) Realistic Large Break LOCA [RLBLOCA] (EMF-2103 Revision 3) used S-RELAP5/COPERNIC combination for initialization conditions for thermal hydraulics (T-H) Code.
Framatomes PWR Small Break LOCA [SBLOCA] (EMF-2328) used S-RELAP5/RODEX2 Combination for Initialization Conditions for T-H Code.
In 2020 NRC approved modern Fuel Performance Code GALILEO in ANP-10323-P Revision 1.
The GALILEO code models the thermal-mechanical behavior of the fuel rods during normal operation and transient scenarios.
3
REGULATORY EVALUATION 10 CFR 50.46, "Acceptance Criteria for Emergency Core Cooling Systems (ECCS) for Light-Water Nuclear Power Reactors" 10 CFR Part 50 Appendix A, "General Design Criteria for Nuclear Power Plants," General Design Criterion (GDC) 35, "Emergency core cooling" Chapter 6.3, Emergency Core Cooling System, of the Standard Review Plan (SRP) provides guidance for performing the system review of the ECCS.
Chapter 15.6.5, Loss of Coolant Accidents, of the SRP provides guidance for performing reviews of loss of coolant accident (LOCA) analyses 4
GALILEO IMPLEMENTATION IN S-RELAP5 AND RLBLOCA NRC staff review included a virtual audit of all related documents and requests for additional information (RAIs).
RAIs concentrated on GALILEO/S-RELAP5 Hybrid scheme and SBLOCA sensitivity analysis GALILEO code replaces COPERNIC in RLBLOCA analysis for S-RELAP5 T-H fuel and T-H Calculations.
The LOFT tests were used to assess the base for the supplemental RLBLOCA evaluation model (EM) and benchmarked using the coupled S-RELAP5/GALILEO.
Sample problem is similar to the problem presented in the approved RLBLOCA evaluation and methodology TR was solved (Appendix B, EMF-2103-P-A, Revision 3).
Results from LOFT Tests and Sample problem indicate reasonable agreement between GALILEO and COPERNIC.
5
GALILEO IMPLEMENTATION IN S-RELAP5 AND SBLOCA GALILEO code replaces RODEX2 in SBLOCA analysis for S-RELAP5 T-H fuel and T-H Calculations.
The LOFT tests were used to assess the base for the supplemental SBLOCA EM and benchmarked using the coupled S-RELAP5/GALILEO.
Sample problem is similar to the problem presented in the approved RLBLOCA evaluation and methodology TR was solved (EMF-2328 P-A).
Results from LOFT Tests and Sample problem indicate reasonable agreement between GALILEO and RODEX2.
6
GALILEO IMPLEMENTATION IN LOCA EM - CONCLUSIONS The NRC staff reviewed the process and the results from the supplemental evaluation model (ANP-10349P) for both RLBLOCA and SBLOCA replacing both COPERNIC and RODEX2 with GALILEO.
LOFT test and sample problem results show there is reasonable agreement between GALILEO and COPERNIC/RODEX2 for both RLBLOCA and SBLOCA analyses.
Framatome shall publish the approved version of ANP-10349P as supplemental TR to the final approved versions of EMF-2103 and EMF-2328.
7