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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 0 | Transient Analysis for the EFIT 3-Zone Core P. Liu, X.-N. Chen, A. Rineiski, S. Wang, M. Flad, W. Maschek Forschungszentrum Karlsruhe, IKET Postfach 3640, D Karlsruhe IP EUROTRANS DM1 WP1.5 Mtg. Bologna, May 2008 IP EUROTRANS DM1

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 1 | Contents Design base and Some former work; Design base and Some former work; (ULOF, Beam trip, UTOP, UBA already presented in last meeting) (ULOF, Beam trip, UTOP, UBA already presented in last meeting) SIMMER-III new model; SIMMER-III new model; (with a new implemented pump model) (with a new implemented pump model) ULOF (under new pressure drop conditions); ULOF (under new pressure drop conditions); Beam Trip (short term beam trip:1second); Beam Trip (short term beam trip:1second); Unprotected Blockage (first fuel ring totally blocked); Unprotected Blockage (first fuel ring totally blocked); Summaries Summaries

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 2 | ENEA 384MWth 3Zone Core Design Output section Hex. wrapper Fuel bundle Central rod Joint section 186 Ø Ø 146 Ø Ø Ø Input tube Conical foot Output section Hex. wrapper Fuel bundle Central rod Joint section 186 Ø Ø Ø 146 Ø 127 Ø 146 Ø Ø Ø Ø Ø Input tube Conicalfoot

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 3 | Former work-SIMMER-III simulation of the steady state SIMMER-IIISIMMER-III ENEA

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 4 | SIMMER-III Calculated Peak Fuel Temperature: ; Peak Clad Temperature: Peak Fuel Temperature: ; Peak Clad Temperature: SIMMER-III Calculated Peak Fuel Temperature: ; Peak Clad Temperature: Peak Fuel Temperature: ; Peak Clad Temperature: Limit temperatures at nominal conditions: Fuel 1380, Clad 550 ; (From ENEA Files) Former work-SIMMER-III simulation of the steady state

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 5 | New geometrical model of EFIT core in SIMMER-III Coolant outlet Coolant inlet Coolant flow pass Pump region Heat exchanger region region New

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 6 | ULOF analysis Assumptions and conditions: Core - SG midplane distance: 3.7 m; Core - SG midplane distance: 3.7 m; The transient starts at 60 s from a well established steady-state; The transient starts at 60 s from a well established steady-state; Total pressure drop in the primary system Total pressure drop in the primary system 1.1 bar; 1.1 bar; 1.37 bar (two cases); 1.37 bar (two cases); 1.87 bar; 1.87 bar; Pump head becomes zero in 10 s; halving time = 2 s; (Main) Pump head becomes zero in 10 s; halving time = 2 s; (Main) Pump head becomes zero in 5s, halving time =2 s; Pump head becomes zero in 5s, halving time =2 s; (for the 2 nd case of 1.37bar) (for the 2 nd case of 1.37bar) Assumptions and conditions: Core - SG midplane distance: 3.7 m; Core - SG midplane distance: 3.7 m; The transient starts at 60 s from a well established steady-state; The transient starts at 60 s from a well established steady-state; Total pressure drop in the primary system Total pressure drop in the primary system 1.1 bar; 1.1 bar; 1.37 bar (two cases); 1.37 bar (two cases); 1.87 bar; 1.87 bar; Pump head becomes zero in 10 s; halving time = 2 s; (Main) Pump head becomes zero in 10 s; halving time = 2 s; (Main) Pump head becomes zero in 5s, halving time =2 s; Pump head becomes zero in 5s, halving time =2 s; (for the 2 nd case of 1.37bar) (for the 2 nd case of 1.37bar)

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 7 | ULOF analysis -1.1 bar pressure drop Pump head becomes zero in 10 s, halving time =2 s

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 8 | ULOF analysis bar pressure drop (1 st case) Pump head becomes zero in 10 s, halving time =2 s

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 9 | ULOF analysis bar pressure drop (1st case) Simple view of the Coolant Movement in the system during the pump coast down process.

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 10 | ULOF analysis bar pressure drop (2 nd case) Pump head becomes zero in 5 s, halving time =2 s Pump coast down data needed!!

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 11 | ULOF analysis bar pressure drop Pump head becomes zero in 10 s, halving time =2 s

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 12 | ULOF-Comparison

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 13 | Beam trip analysis External beam amplitude being zero for 1 second. Assumption: External beam amplitude being zero for 1 second. Maximum fuel temp. decrease about 554 K ; Maximum fuel temp. decrease about 554 K ; Maximum clad temperature decrease Maximum clad temperature decrease about 14 K; about 14 K; Maximum coolant temperature decrease about 12 K. Maximum coolant temperature decrease about 12 K. Maximum fuel temp. decrease about 554 K ; Maximum fuel temp. decrease about 554 K ; Maximum clad temperature decrease Maximum clad temperature decrease about 14 K; about 14 K; Maximum coolant temperature decrease about 12 K. Maximum coolant temperature decrease about 12 K. Fuel temp. at core mid-plane; Fuel temp. at core mid-plane; Coolant and clad temp. at core outlet Coolant and clad temp. at core outlet Fuel temp. at core mid-plane; Fuel temp. at core mid-plane; Coolant and clad temp. at core outlet Coolant and clad temp. at core outlet

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 14 | Unprotected blockage Assumptions/Conditions/Parameters: Innermost ring totally blocked Transient starts at 30 s from a well established steady-state; He & fission gas pressure (1MPa BOC initial at gas plenum) Radial heat exchange between SA rings is taken into account; Clad failure and gas release at 1280K; Clad weakening and start of fuel movement at 1513 K Hexcan crack at 1280K; Hexcan weakening at 1513K; Fuel particle size volumetrically equals to one pellet: r = 4.555mm; Steel particle size r = 2.0mm; No-removable upper pin structure; No damage propagation to Target facility;Assumptions/Conditions/Parameters: Innermost ring totally blocked Transient starts at 30 s from a well established steady-state; He & fission gas pressure (1MPa BOC initial at gas plenum) Radial heat exchange between SA rings is taken into account; Clad failure and gas release at 1280K; Clad weakening and start of fuel movement at 1513 K Hexcan crack at 1280K; Hexcan weakening at 1513K; Fuel particle size volumetrically equals to one pellet: r = 4.555mm; Steel particle size r = 2.0mm; No-removable upper pin structure; No damage propagation to Target facility;

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 15 | Unprotected blockage-Continued Power increased to a maximum of 655 MW; Power increased to a maximum of 655 MW; Fuel pin damage propagation happens, damage spreads to the third fuel ring. Fuel pin damage propagation happens, damage spreads to the third fuel ring. Power increased to a maximum of 655 MW; Power increased to a maximum of 655 MW; Fuel pin damage propagation happens, damage spreads to the third fuel ring. Fuel pin damage propagation happens, damage spreads to the third fuel ring.

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(1) Die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) 16 | Summaries ULOF Analysis New SIMMER modeling on the ULOF has been performed with a pump and heat exchange region and in turn, the three free surface well modeled with the implemented pump model in SIMMER-III; New SIMMER modeling on the ULOF has been performed with a pump and heat exchange region and in turn, the three free surface well modeled with the implemented pump model in SIMMER-III; Under the 1.37 bar total pressure drop and the assumed pump coast down conditions, the current core can survive the ULOF transient; Under the 1.37 bar total pressure drop and the assumed pump coast down conditions, the current core can survive the ULOF transient; Pump coast down data should be well established; Pump coast down data should be well established; Beam Trip Analysis With a 1 seconds beam-off, the maximum fuel temperature decreases about 554 K, the maximum clad temperature transiently decreases 14 K, the maximum coolant temperature decreases 12 K; With a 1 seconds beam-off, the maximum fuel temperature decreases about 554 K, the maximum clad temperature transiently decreases 14 K, the maximum coolant temperature decreases 12 K; UBA Analysis Fuel damage could happen and spread to the third fuel ring if the first fuel ring is completely blocked; Fuel damage could happen and spread to the third fuel ring if the first fuel ring is completely blocked; The power can arrive as high as 655 MW; The power can arrive as high as 655 MW; The power finally decreases due to the inherent fuel sweep-out mechanism. The power finally decreases due to the inherent fuel sweep-out mechanism.

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