Godiva IV Startup At NCERC Delayed Critical Through Prompt .
UNCLASSIFIEDGodiva IV Startup at NCERCDelayed Critical through Prompt CriticalJoetta Goda, John Bounds, Travis Grove, Dave Hayes,Jesson Hutchinson, Bill Myers, Rene SanchezNEN-2March 26-27, 2014UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 1
UNCLASSIFIEDGodiva Assembly Overview Cylindrical uranium metalfast burst assembly 65 kg, 93% enriched 7-inch diameter (17.8 cm),6-inch tall (15.2 cm) Core without safety block orcontrol rods Multiplication 10 keff 0.9UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 2
UNCLASSIFIEDTimeline Godiva IV was built in 1967 and operated at TA-18 until July 2004—Last Prompt Burst August 2004—Last Critical Operation July 2005—Godiva was disassembled April 2012—Godiva assembled October 2012—First Critical at DAF September 2013—First Prompt at DAFUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 3
UNCLASSIFIEDApproach to CriticalPosition(in)2.472.061.561.071/M on Sum of ControlRod positions 0.51.00.90.80.70.60.50.40.30.20.10.03.0 2.52.01.50.0Excess reactivity 1.07 compared to 1.23 prior to disassemblyUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 4
UNCLASSIFIEDReproducibility of Control ElementsControl RodSafety BlockBurst Rod Insert CR 1 Establish positive period Insert BR Find DC with CR 2 Measure period Establish positive period Record CR 2 position Remove SB Measure period Remove CR 2 Insert SB Remove BR Repeat Repeat Repeat0.250 0.001 in45.07 0.59 sec21.34 0.41 sec 0.04 0.15 0.29 Comparable to values measured during 1993 restartUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 5
UNCLASSIFIEDBurst Operation1.2.3.4.5.6.7.Move Control Rod 2 to 0.250”Find DC with Control Rod 1Insert (or remove) burst increment with Control Rod 2Retract safety block 2-5 inchesWait 15-20 minutes for delayed neutron decayInsert safety blockImmediately insert burst rod (requires both crew members)1, 2346, 75UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA
UNCLASSIFIEDSafety Block Rate of ShutdownSafety Block Rod Drop MeasurementSum of Counters 1- 46000050000400003000020000100000570 580590600Time(s)610620630Shutdown Rate is approx. - 10/sUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 7
UNCLASSIFIEDControl Rod CalibrationUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 8
UNCLASSIFIEDWorth of Burst RodCR 2Position(in.)2.050MeasuredReactivity( ) 0.34Period(sec)15DesiredReactivity( )0.32Reactivity toRemove( )0.68100.390.611.8508.63 0.41 1.0250.510.491.5004.38 0.54 1.0310.780.220.8250.85 0.80 1.020.20.930.07 0.090.4500.181 0.94 1.01 .020.10.960.04 0.060.2960.0510 0.98 1.02 .020.050.980.02 0.050.2790.0354 0.985 1.01 .030.0120.9950.005 0.0450.2610.0301 0.987 .992 .04**MeasuredPeriod(sec)13.19 0.04 AdjustmentUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSABurst RodWorth( ) 1.02Burst Rod Worth 1.032LA-UR-14-21824Slide 9
UNCLASSIFIEDBurst Reproducibility Establish DC Establish DC Remove burst increment Remove burst increment Remove SB Remove SB Wait Wait Insert SB Insert SB Insert BR/burst Insert BR/burst BR out BR out Repeat Repeat90.69 0.13 90.19 0.03 UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 10
UNCLASSIFIEDReactivity Quenching (Temperature Coefficient)For characterization plan, we started on a positive period andshowed that as temperature increased, period decreased. A free run would also demonstrate a negative temperature coefficient.Enough variation in room temperature over characterization to plotexcess reactivity versus temperature. Reactivity versus Average Temperature20.019.0Reactivity (cents)y -0.4296x 27.07518.017.016.0- 0.4 cents/ºC15.014.013.020222426Temperature (deg C)UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA2830LA-UR-14-21824Slide 11
UNCLASSIFIEDApproach-to-Prompt Perform successively larger bursts Most accurate determination of rod worth100 Demonstrates process99.3 9998Reactivity (cents)9796959493929190-350UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA-300-250-200-150Burst Increment (mils)-100-50LA-UR-14-21824Slide 12
UNCLASSIFIEDFirst Super-Prompt Burst at DAF, September 2013On September 10, 2013,Godiva IV burst for the first time inNevada.Burst #1963 had a temperature rise of60º C and a reactivity of 1.03.Three more bursts of increasing sizefollowed over the next two days.UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 13
UNCLASSIFIEDSuper-Prompt Bursts Burst Size Measured by: Temperature Rise Initial Period Measurement on PMT FWHM on PD250 Fission FoilsT1: Ring 104Temperature (deg C)200T2: Safety Block1501005004:12:00 PMUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA4:14:53 PM4:17:46 PM4:20:38 PM4:23:31 PM4:26:24 PMLA-UR-14-21824Slide 14
UNCLASSIFIEDSuper-Prompt Bursts250200T2: Safety 5:04:1915:07:12Temperature (deg C)Temperature (deg C)108 ºC Temperature Rise 1.06 Reactivity T1: Ring 104200 ºC Temperature Rise 1.10 Reactivity T2: Safety Block15010050012:48:58UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSAT1: Ring R-14-21824Slide 15
UNCLASSIFIEDDosimetry 1.03/60º BurstNeutron Dose(rem)169134330272.1Total Dose(rem)175141343288.1Dose at X1 for Different Burst SizesX1X14X7X3GodivaDose (rem)X1X3X5X7X14Gamma Dose(rem)67131709008007006005004003002001000 1.02GammaNeutron 1.04 1.06 1.08Burst Size ( ) 1.10 1.12X5UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 16
UNCLASSIFIEDAvailable Burst Sizes and SpecificationsDelta T (C)Mini-burst70 degree150 degree250 degreeReactivity 0.993 1.04 1.07 1.10Initial Period15 msec30 µsec18 µsec11 100 µsec55 µsec33 µsec1 E 162 E 164 E 16# fissionsUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 17
UNCLASSIFIEDRecent Data – January 14, 2014Three bursts in one day120T1: Ring 104100T2: Safety BlockT5: d by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA16:3018:30LA-UR-14-21824Slide 18
UNCLASSIFIEDRecent Data – January 25, 2014Photomultiplier and photodiode setup and checkout continueUNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 19
UNCLASSIFIEDAcknowledgementsThis work was supported by the DOE Nuclear Criticality SafetyProgram, funded and managed by the National Nuclear SecurityAdministration for the Department of Energy.UNCLASSIFIEDOperated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSALA-UR-14-21824Slide 20
Anti-Rotation 9/16”X 4 3/8” GloryHole MandrelBolt SteelLoading Ring MaragingSteel Clamp RTD MaragingSteelCompression Ring Safety LockingBlock SteelBoltSupport Pad Support BurstLegRod RTD Safetyblockmandrel UpperSupport Plate AttachmentBolts
Jesson Hutchinson, Bill Myers, Rene Sanchez NEN-2 . March 26-27, 2014 . . Find DC with Control Rod 1 3. Insert (or remove) burst increment with Control Rod 2 4. Retract safety block 25 inches- 5. Wait 15-20 minutes for delayed neutron decay . A free run w
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