ML16062A379
| 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: |
| 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:
Parameter P
369 kW 10 kW 359 kW 115 kW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in T pool 130 F 3 F 127 F 127 F to reach ONB Natural Convection Steady State Analysis P measured Above Fuel Meat Minimum LSSS Proposed TS LSSS TS 2.2.1 Limiting True Value Used in Analysis Measurement Error 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.
Parameter P
4.72 MW 0.2 MW 4.52 MW 2.3 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1580 gpm 60 gpm 1640 gpm 1600 gpm 1500 gpm 1560 gpm 1560 gpm T out 125 F 3 F 128 F 121 F T in 115 F 3 F 112 F 125 F 122 F 122 F Forced Convection Steady State Analysis Limiting True Value Measurement Minimum Proposed LSSS to reach ONB Above Fuel Meat To Have T channel Average = 120 F To Have T channel Used in Analysis Error LSSS TS 2.2.2 P measured None Not Used None Average = 120 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:
Parameter P
P trip
=
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 8.4 in m
1500 gpm 60 gpm 1560 gpm 1600 gpm T in 125 F 3 F 122 F 122 F T out None P measured Above Fuel Meat Analysis Settings Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 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:
Transient Description Parameter P
P i
=
10 W 0.2 MW P trip
=
2.5 MW P trip =
=
2.61 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
86.2 C Used in Analysis Error LSSS TS 2.2.2 P measured Forced Convection Transient Analysis - Case 1 Limiting True Value Measurement Minimum Proposed LSSS 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.
100 ms delay before negative reactivity inserted. P max = 2.61 MW.
None Not Used Above Fuel Meat Maximum Centerline Maximum Maximum T fuel meat T clad surface T coolant 87.1 68.0 C Transient Description Parameter P
P i
=
10 W 0.2 MW P trip
=
2.5 MW P trip =
=
2.69 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
85.2 C Forced Convection Transient Analysis - Case 2 P i = 10 W and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
100 ms delay before negative reactivity inserted. P max = 2.69 MW.
Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 None Maximum Centerline Maximum Maximum T fuel meat T clad surface T coolant P measured Above Fuel Meat Not Used 86.1 67.0 C
Transient Description Parameter P
P i
=
=
2.5 MW P trip =
=
2.516 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
87.8 C 100 ms delay before negative reactivity inserted. P max = 2.516 MW.
Limiting True Value Measurement Minimum Proposed LSSS Forced Convection Transient Analysis - Case 3 P i = 1.8 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
Maximum Maximum Not Used Used in Analysis Error LSSS TS 2.2.2 P measured None T fuel meat T clad surface T coolant 88.6 69.6 C Above Fuel Meat Maximum Centerline Transient Description Parameter P
P i
=
=
2.5 MW P trip =
=
2.511 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
87.9 C 88.8 69.6 C Maximum Centerline Maximum Maximum Above Fuel Meat Used in Analysis Error LSSS Not Used None T fuel meat T clad surface T coolant TS 2.2.2 P measured Forced Convection Transient Analysis - Case 4 P i = 2.2 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
100 ms delay before negative reactivity inserted. P max = 2.5112 MW.
Limiting True Value Measurement Minimum Proposed LSSS
Transient Description Parameter P
P i
=
100 kW 10 kW 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 T pool 130 F 3 F 127 F 127 F Transient Results C
78.9 C 78.9 75.7 C T fuel meat Maximum T clad surface Maximum T coolant Maximum Centerline Used in Analysis Error LSSS Above Fuel Meat TS 2.2.1 P measured Natural Convection Transient Analysis - Case 5 Limiting True Value Measurement Minimum Proposed LSSS P i = 100 kW which is allowed to stablize for 360 S. 0.6% dk/k is inserted over a time period of 0.1 s. Reactor trips at 125 kW. P max reaches 369 kW.
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:
Parameter P
369 kW 10 kW 359 kW 115 kW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in T pool 130 F 3 F 127 F 127 F to reach ONB Natural Convection Steady State Analysis P measured Above Fuel Meat Minimum LSSS Proposed TS LSSS TS 2.2.1 Limiting True Value Used in Analysis Measurement Error 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.
Parameter P
4.72 MW 0.2 MW 4.52 MW 2.3 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1580 gpm 60 gpm 1640 gpm 1600 gpm 1500 gpm 1560 gpm 1560 gpm T out 125 F 3 F 128 F 121 F T in 115 F 3 F 112 F 125 F 122 F 122 F Forced Convection Steady State Analysis Limiting True Value Measurement Minimum Proposed LSSS to reach ONB Above Fuel Meat To Have T channel Average = 120 F To Have T channel Used in Analysis Error LSSS TS 2.2.2 P measured None Not Used None Average = 120 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:
Parameter P
P trip
=
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 8.4 in m
1500 gpm 60 gpm 1560 gpm 1600 gpm T in 125 F 3 F 122 F 122 F T out None P measured Above Fuel Meat Analysis Settings Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 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:
Transient Description Parameter P
P i
=
10 W 0.2 MW P trip
=
2.5 MW P trip =
=
2.61 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
86.2 C Used in Analysis Error LSSS TS 2.2.2 P measured Forced Convection Transient Analysis - Case 1 Limiting True Value Measurement Minimum Proposed LSSS 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.
100 ms delay before negative reactivity inserted. P max = 2.61 MW.
None Not Used Above Fuel Meat Maximum Centerline Maximum Maximum T fuel meat T clad surface T coolant 87.1 68.0 C Transient Description Parameter P
P i
=
10 W 0.2 MW P trip
=
2.5 MW P trip =
=
2.69 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
85.2 C Forced Convection Transient Analysis - Case 2 P i = 10 W and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
100 ms delay before negative reactivity inserted. P max = 2.69 MW.
Limiting True Value Measurement Minimum Proposed LSSS Used in Analysis Error LSSS TS 2.2.2 None Maximum Centerline Maximum Maximum T fuel meat T clad surface T coolant P measured Above Fuel Meat Not Used 86.1 67.0 C
Transient Description Parameter P
P i
=
=
2.5 MW P trip =
=
2.516 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
87.8 C 100 ms delay before negative reactivity inserted. P max = 2.516 MW.
Limiting True Value Measurement Minimum Proposed LSSS Forced Convection Transient Analysis - Case 3 P i = 1.8 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
Maximum Maximum Not Used Used in Analysis Error LSSS TS 2.2.2 P measured None T fuel meat T clad surface T coolant 88.6 69.6 C Above Fuel Meat Maximum Centerline Transient Description Parameter P
P i
=
=
2.5 MW P trip =
=
2.511 MW H
23 ft 6.5 in 0.5 in 23 ft 7 in 23 ft 7 in m
1500 gpm 60 gpm 1560 gpm 1560 gpm T in 125 F 3 F 122 F 122 F T out Transient Results C
87.9 C 88.8 69.6 C Maximum Centerline Maximum Maximum Above Fuel Meat Used in Analysis Error LSSS Not Used None T fuel meat T clad surface T coolant TS 2.2.2 P measured Forced Convection Transient Analysis - Case 4 P i = 2.2 MW and 0.02 %dk/k per second is inserted for 100s. Reactor trips at P = 2.5 MW.
100 ms delay before negative reactivity inserted. P max = 2.5112 MW.
Limiting True Value Measurement Minimum Proposed LSSS
Transient Description Parameter P
P i
=
100 kW 10 kW 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 T pool 130 F 3 F 127 F 127 F Transient Results C
78.9 C 78.9 75.7 C T fuel meat Maximum T clad surface Maximum T coolant Maximum Centerline Used in Analysis Error LSSS Above Fuel Meat TS 2.2.1 P measured Natural Convection Transient Analysis - Case 5 Limiting True Value Measurement Minimum Proposed LSSS P i = 100 kW which is allowed to stablize for 360 S. 0.6% dk/k is inserted over a time period of 0.1 s. Reactor trips at 125 kW. P max reaches 369 kW.