ML12076A165

Meeting Slides - Harris Realistic LBLOCA Question Response Meeting

ML12076A165
Person / Time
Site:	Harris
Issue date:	01/11/2012
From:	Progress Energy Carolinas
To:	Billoch-Colon A Plant Licensing Branch II
Billoch-Colon, Araceli
Shared Package
ML12076A140	List: ML12076A141 ML12076A142 ML12076A165
References
TAC ME6999
Download: ML12076A165 (48)

Text

• Introductions

• Overview of Status

• Response to Individual questions from December 13th Meeting

• Schedule

• Concluding Remarks Harris M5 RLBLOCA questions - NRC Meeting p.2 ~ Progress Energy

Progress Energy

• Mike Blom

• John Caves

• Dave Corlett

• Dean Tibbitts AREVA

• Bob Baxter

• Bert Dunn

• Mireille Cortes

• Nithian Nithianandan

• Gayle Elliott (IQ~

Harris M5 RLBLOCA questions - NRC Meeting

p. 3 ~ Progress Energy

Cycle 18 Feed Assembly Zircaloy 4 M5 Clad LBLOCA Method EMF-2087 ANP-3011 based on EMF-2103 PCT 2081 OF 1919 OF Transient 7%

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Oxidation Safety Analysis 2958 2958 Core Power (MW)

Harris M5 RLBLOCA questions - NRC Meeting

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p.4 ~ Progress Energy

Appendix K 2958 Zircaloy 4 2081 7.0 EMF-2103 Best 2993 Zircaloy4 1887 2.02 Rev 0 Estimate EMF-2103, i Best 2958 1930 11.95 Rev 0 +

Estimate Trans Pkg ANP-3011 Best 2958 M5 1919 2.94 Estimate

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Harris M5 RLBLOCA questions - NRC Meeting p.5 L Progress Energy

• Additional Sensitivity Cases Run (Response to Question 1)

• Discussions of Questions 2 to 6 refined and responses prepared Harris M5 RLBLOCA questions - NRC Meeting

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p.6 ~ Progress Energy

• Characterize droplet shattering model without modeling the fuel relocation

• Show the sensitivity of the fuel relocation to fuel relocation packing factor

• Consider including a range of packing factors 30 - 80%

• Utilize the Harris Nuclear Plant (HNP) limiting-peak clad temperature (PCT) case

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Harris M5 RLBLOCA questions - NRC Meeting

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p. 7 ~ Progress Energy

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Question #1 Expand Sensitivity Study Table 1: 0.5 Packing Fraction Cases with Hot Assembly Rupture Harris M5 RLBLOCA questions - NRC Meeting p.9 ~ Progress Energy

Question #1 Expand Sensitivity cont'd

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Table 2: 0.6 Packing Fraction Cases with Hot Assembly Rupture Harris M5 RlBlOCA questions - NRC Meeting

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p.1 0 ~ Progress Energy

Question #1 Expanded Sensitivity cont'd

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Table 3: 0.7 Packing Fraction Cases with Hot Assembly Rupture Harris M5 RLBLOCA questions - NRC Meeting

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p. 11 ~ Progress Energy

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Histogram of PCT with Droplet Shattering Activated - 0.7 Packing Fraction Harris M5 RLBLOCA questions - NRC Meeting

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Question #1 Maximum Packing Factor [PF] Considerations PBF - Power Burst Facility

• Only 1 gamma scanning data point at 80%

packing fraction and it is at 30% strain

• Data results are in question due to material movement during the handling of the test rods

• Micrographies measurement is more accurate compared to gamma scanning

• PBF micrographic data shows 70% PF for rupture strain below 50%

• AREVA estimates 45% PF for strains near 70%

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Harris M5 RLBLOCA questions - NRC Meeting

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p.15 ~, Progress Energy

Question #1 Maximum PF Considerations conl'd Packing Fraction vs. Rupture Strain Note: The balloon Balloon filling rate (0/0) by relocated fragments filling rate is interpreted as packing 90'

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Harris M5 RlBlOCA questions - NRC Meeting p.16 ~ Progress Energy

FR-2 (E-5) 61.5%

I Test maximized rupture strain and had very small rupture opening Halden IFA-53%

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Halden Test No relocation (no strain) 60GWd IFA-650.10 Harris M5 RLBLOCA questions - NRC Meeting

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p.17 ~ Progress Energy

• Studsvik Tests - Provide results for burn-ups at 70 GWd, show no fuel in the ruptured region as it was all lost out of the rupture

• KfK/FR2 Tests - Only rod E5 showed a PF of 61.5%. During the swelling and rupture of the rod, the cladding expanded to make a seal around the 10 of the container tube, thus invalidating any other results Harris M5 RLBLOCA questions - NRC Meeting p.18 ~ Progress Energy

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• 50%, as in ANP-3011 P, is an appropriate PF based on the Halden test results, which are the most reliable information available

• 70% PF is an upper limit (based on older PBF data) for the strain range seen in the HNP plant cases

• Sensitivity study concludes base case is conservative and no bias is proposed (with droplet shattering)

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Harris M5 RLBLOCA questions - NRC Meeting p.22 ~ Progress Energy

Question #2 Droplet Shattering Model Address whether droplet shattering is calculated on all flow blockage (non-vertical) surfaces in the S-RELAP5 calculation. If not, provide the flow blockage surfaces which are assumed to cause droplet shattering.

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Page 122 of ANP-3011 (P), "Harris Nuclear Plant Unit 1 Realistic Large Break LOCA Analysis" states, In the present model, the rupture blockage ratio [which is correlated to the number of droplets to yield a maximum atomization factor], 8, is taken from the swelling and rupture correlation.

• Address whether droplet shattering is calculated only against the hot pin rupture, or the additional flow blockage areas (i.e., balloon/burst regions, spacer grids, etc.) assumed to be present upstream of the hot pin rupture location.

• If the additional flow blockage areas are not based on pre-transient core geometry, discuss how the locations and sizes of flow blockages are distributed.

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On page 123 of ANP-3011 (P), it is stated, It can be seen that the code predicted the peak cladding temperature variation well. The data is so tightly clustered that the degree of agreement is difficult to ascertain. Please tabulate the data to provide a more quantitative indication.

Address how well the S-RELAP5 modification predicted the data.

Harris M5 RLBLOCA questions - NRC Meeting p.29 ~ Progress Energy

Question #4 Benchmark to SR Data cont'd

• An Excel spreadsheet that contained blockage Test 61607 data has been placed in PGN FTP site for NRC to retrieve for further evaluation

• Figures 6-14 and 6-15 in ANP-3011 P show S-RELAP5 conservatively predicted PCT compared to blockage test data for the FLECHT-SEASET and REBEKA-6 tests

• Additional FLECHT-SEASET test benchmarks, 61509 and 61607, are presented on the next two slides

• COBRA-TF (NUREG/CR-4166) modeled all expected multi dimensional flow phenomena at rupture location, including flow diversion

• The figures show that S-RELAP5 conservatively predicts cladding response compared to the COBRA-TF results Harris M5 RLBLOCA questions - NRC Meeting

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p.30 ~ Progress Energy

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Comparative data demonstrate the global effects of the droplet shattering phenomena; however, the correlation as implemented discriminates between large and small droplets and the behavioral differences between the two. Validate droplet size distribution as implemented in model. Explain how the Sugimoto/Murao correlation applies to the scenario in which it is applied.

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p.33 ~ Progress Energy

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Question #6 Droplet shattering impacts on Heat Transfer

Explain how droplet shattering model incorporates the following droplet-dependent heat transfer effects:

• Inter-phase heat transfer

• Fluid-structural interactions including cladding, balloon, and spacer heat transfer to coolant

• Validate heat transfer modeling for these separate effects Harris M5 RLBLOCA questions - NRC Meeting

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Harris M5 RLBLOCA questions - NRC Meeting

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p.39 ~ Progress Energy

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• Droplet shatter model is implemented in a conservative manner

• Benchmarking demonstrates that sensitivity study model provides conservative predictions "Ir.p-

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• Best estimate to upper bound packing factor is 50% to 70%

• The response of PCT over a range of PF shows a smooth response to changes

• AREVA's sensitivity method has been successfully benchmarked against applicable research

• AREV A's treatment of the SRR phenomenon is applied in a conservative manner within ANP-3011

• A PCT of 1919 from base case is therefore defensible

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Harris M5 RLBLOCA questions - NRC Meeting

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p.43 ~ Progress Energy

Discussion of questions received on January 10th, 2012.

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Harris M5 RlBlOCA questions - NRC Meeting

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p.44 L Progress Energy

• Progress Energy will docket the responses

• Projected docket date is January 20, 2012

• Target date for new round of questions to be docketed is the week of February 13th

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Harris M5 RLBLOCA questions - NRC Meeting p.45 ~ Progress Energy

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