ML16062A379

New Transient Analysis Results 160226

ML16062A379
Person / Time
Site:	Rhode Island Atomic Energy Commission
Issue date:	03/01/2016
From:	Marlone Davis State of RI, Atomic Energy Comm
To:	Patrick Boyle Office of Nuclear Reactor Regulation
Shared Package
ML16062A372	List: ML16062A373 ML16062A374 ML16062A375 ML16062A376 ML16062A377 ML16062A378 ML16062A379 ML16062A380 ML16062A381 ML16062A382 ML16062A383
References
160226
Download: ML16062A379 (5)

Text

New Transient Analysis Results 160226 I need to show that the fuel cladding safety limit of 530 C is not reached under the following conditions:

- Natural Convection Cooling Under Steady State Power Conditions

- Forced Convection Cooling Under Steady State Power Conditions

- Natural Convection Cooling Under Transient Power Conditions

- Forced Convection Cooling Under Transient Power Conditions Natural Convection Cooling Under Steady State Power Conditions The analysis for this condition is described in the memo entitled Steady State Thermal Hydraulic Analysis for Natural Convective Flow in the Rhode Island Nuclear Science Center (RINSC) Reactor. Section 4.7.6 shows the results of the analysis to be that for the most limiting fuel plate to reach the onset of nucleate boiling under natural convection flow conditions with 130 F water, at a height of 23 ft 6.5 in above the active core, reactor power would have to be 369 kW.

Based on this analysis, and the measurement error that has been determined, the proposed Technical Specification limiting safety system settings are:

Natural Convection Steady State Analysis Parameter Limiting True Value Measurement Minimum Proposed TS LSSS Used in Analysis Error LSSS TS 2.2.1 P 369 kW 10 kW 359 kW P measured to reach ONB 115 kW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat T pool 130 F 3F 127 F 127 F Forced Convection Cooling Under Steady State Power Conditions The analysis for this condition is described in the memo entitled Steady State Thermal Hydraulic Analysis for Forced Convective Flow in the Rhode Island Nuclear Science Center (RINSC) Reactor. Section 4.6.10 shows the results of the analysis to be that for the most limiting fuel plate to reach the onset of nucleate boiling under flow conditions 1580 gpm with 120 F water, at a height of 23 ft 6.5 in above the active core, reactor power would have to be 4.72 MW.

Forced Convection Steady State Analysis Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P 4.72 MW 0.2 MW 4.52 MW P measured to reach ONB 2.3 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1580 gpm 60 gpm 1640 gpm 1600 gpm 1500 gpm 1560 gpm 1560 gpm T out 125 F 3F 128 F 121 F To Have T channel Average = 120 F Not Used None T in 115 F 3F 112 F None To Have T channel Average = 120 F 125 F 122 F 122 F The transient analyses were done in response to RAI Question 13.7. The parameter settings that were used for the transient analyses, the measurement error associated with each parameter, and the minimum LSSS for each parameter are:

Analysis Settings Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P P trip = 2.5 MW 0.2 MW P trip = 2.3 MW P measured 2.3 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 8.4 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1600 gpm T in 125 F 3F 122 F 122 F T out None None Five transients were considered:

- Case 1: Rapid Insertion of 0.6% k/k Reactivity From Very Low Power

- Case 2: Slow Insertion of 0.02 % k/k /Second Reactivity From Very Low Power

- Case 3: Slow Insertion of 0.02 % k/k / Second Reactivity From 1.8 MW Power

- Case 4: Slow Insertion of 0.02 % k/k /second Reactivity From 2.2 MW Power

- Case 5: Rapid Insertion of 0.6% k/k Reactivity From 100 kW Under Natural Convection Cooling

A summary of the results for each case is:

Forced Convection Transient Analysis - Case 1 Transient P i = 10 W and 0.6%dk/k is added over a period of 0.1 s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.61 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 10 W 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.61 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 87.1 C 86.2 C 68.0 C Forced Convection Transient Analysis - Case 2 Transient P i = 10 W and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.69 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 10 W 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.69 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 86.1 C 85.2 C 67.0 C

Forced Convection Transient Analysis - Case 3 Transient P i = 1.8 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.516 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 1.8 MW 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.516 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 88.6 C 87.8 C 69.6 C Forced Convection Transient Analysis - Case 4 Transient P i = 2.2 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.5112 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 2.2 MW 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.511 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 88.8 C 87.9 C 69.6 C

Natural Convection Transient Analysis - Case 5 Transient P i = 100 kW which is allowed to stablize for 360 S. 0.6% dk/k is inserted over a time Description period of 0.1 s. Reactor trips at 125 kW. P max reaches 369 kW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.1 P Pi = 100 kW 10 kW P measured P trip = 125 kW P trip = 115 kW 115 kW P max = 369 kW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat T pool 130 F 3F 127 F 127 F Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 78.9 C 78.9 C 75.7 C

New Transient Analysis Results 160226 I need to show that the fuel cladding safety limit of 530 C is not reached under the following conditions:

- Natural Convection Cooling Under Steady State Power Conditions

- Forced Convection Cooling Under Steady State Power Conditions

- Natural Convection Cooling Under Transient Power Conditions

- Forced Convection Cooling Under Transient Power Conditions Natural Convection Cooling Under Steady State Power Conditions The analysis for this condition is described in the memo entitled Steady State Thermal Hydraulic Analysis for Natural Convective Flow in the Rhode Island Nuclear Science Center (RINSC) Reactor. Section 4.7.6 shows the results of the analysis to be that for the most limiting fuel plate to reach the onset of nucleate boiling under natural convection flow conditions with 130 F water, at a height of 23 ft 6.5 in above the active core, reactor power would have to be 369 kW.

Based on this analysis, and the measurement error that has been determined, the proposed Technical Specification limiting safety system settings are:

Natural Convection Steady State Analysis Parameter Limiting True Value Measurement Minimum Proposed TS LSSS Used in Analysis Error LSSS TS 2.2.1 P 369 kW 10 kW 359 kW P measured to reach ONB 115 kW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat T pool 130 F 3F 127 F 127 F Forced Convection Cooling Under Steady State Power Conditions The analysis for this condition is described in the memo entitled Steady State Thermal Hydraulic Analysis for Forced Convective Flow in the Rhode Island Nuclear Science Center (RINSC) Reactor. Section 4.6.10 shows the results of the analysis to be that for the most limiting fuel plate to reach the onset of nucleate boiling under flow conditions 1580 gpm with 120 F water, at a height of 23 ft 6.5 in above the active core, reactor power would have to be 4.72 MW.

Forced Convection Steady State Analysis Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P 4.72 MW 0.2 MW 4.52 MW P measured to reach ONB 2.3 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1580 gpm 60 gpm 1640 gpm 1600 gpm 1500 gpm 1560 gpm 1560 gpm T out 125 F 3F 128 F 121 F To Have T channel Average = 120 F Not Used None T in 115 F 3F 112 F None To Have T channel Average = 120 F 125 F 122 F 122 F The transient analyses were done in response to RAI Question 13.7. The parameter settings that were used for the transient analyses, the measurement error associated with each parameter, and the minimum LSSS for each parameter are:

Analysis Settings Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P P trip = 2.5 MW 0.2 MW P trip = 2.3 MW P measured 2.3 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 8.4 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1600 gpm T in 125 F 3F 122 F 122 F T out None None Five transients were considered:

- Case 1: Rapid Insertion of 0.6% k/k Reactivity From Very Low Power

- Case 2: Slow Insertion of 0.02 % k/k /Second Reactivity From Very Low Power

- Case 3: Slow Insertion of 0.02 % k/k / Second Reactivity From 1.8 MW Power

- Case 4: Slow Insertion of 0.02 % k/k /second Reactivity From 2.2 MW Power

- Case 5: Rapid Insertion of 0.6% k/k Reactivity From 100 kW Under Natural Convection Cooling

A summary of the results for each case is:

Forced Convection Transient Analysis - Case 1 Transient P i = 10 W and 0.6%dk/k is added over a period of 0.1 s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.61 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 10 W 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.61 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 87.1 C 86.2 C 68.0 C Forced Convection Transient Analysis - Case 2 Transient P i = 10 W and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.69 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 10 W 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.69 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 86.1 C 85.2 C 67.0 C

Forced Convection Transient Analysis - Case 3 Transient P i = 1.8 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.516 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 1.8 MW 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.516 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 88.6 C 87.8 C 69.6 C Forced Convection Transient Analysis - Case 4 Transient P i = 2.2 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.

Description 100 ms delay before negative reactivity inserted. P max = 2.5112 MW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 P Pi = 2.2 MW 0.2 MW P measured P trip = 2.5 MW P trip = 2.3 MW 2.3 MW P max = 2.511 MW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat m 1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3F 122 F 122 F T out Not Used None Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 88.8 C 87.9 C 69.6 C

Natural Convection Transient Analysis - Case 5 Transient P i = 100 kW which is allowed to stablize for 360 S. 0.6% dk/k is inserted over a time Description period of 0.1 s. Reactor trips at 125 kW. P max reaches 369 kW.

Parameter Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.1 P Pi = 100 kW 10 kW P measured P trip = 125 kW P trip = 115 kW 115 kW P max = 369 kW H 23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in Above Fuel Meat T pool 130 F 3F 127 F 127 F Transient Maximum Centerline Maximum Maximum Results T fuel meat T clad surface T coolant 78.9 C 78.9 C 75.7 C