industrial nuclear company, inc. ten hole source changer

Industrial Nuclear Company, Inc. Ten Hole Source Changer

Model THSCDocket No. 71-9360

A Presentation to the US Nuclear Regulatory Commission

June 19, 2018

> NRC #2, June 19, 20182

Agenda

Introduction

Description of THSC Package

Materials of Construction

THSC Payload Descriptions

Certification Test Results

Verification of Shield Integrity

Submittal Schedule

Summary

> NRC #2, June 19, 20183

Description of THSC Package

Enclosed, Right Circular Cylinder12-3/4” OD x 14-1/2” High

Welded Stainless Steel Construction

Depleted Uranium Gamma Shield

Titanium Source Tubes/Hub

Gross Weight: Approximately 330 lb

> NRC #2, June 19, 20184

Description of THSC Package (con’t)

> NRC #2, June 19, 20185

Description of THSC Package (con’t)

Shown without bottom support channels

TOP DU SUPPORT PIPE

LOCK BOX ASSEMBLY

COPPER SHIM, TYP

SIDE DU SUPPORT CHANNEL

PLASTIC BURN-OUT PLUGS(3 PLACES)

38" CLOSURE LID BOLTS

(8 PLACES)

UPPER DUSUPPORT RING

38" THK MOUNTING PLATE

SOURCE TUBE ASSEMBLY(TITANIUM)

DEPLETED URANIUM (DU) SHIELD

DU LOWERSUPPORT RING

POLYURETHANE FOAM

> NRC #2, June 19, 20186

Materials of Construction

Structural:Type 304 stainless steel plate, bar, and pipe

ASTM A320 L7 or L43 Closure Lid & Lock Box Bolts

All welded construction encasing gamma shield

Copper shims between DU and stainless steel contact points

Polyurethane foam for insulation & impact mitigation

0.50” OD x 0.056” wall titanium source tubes

Titanium hub

Gamma ShieldingCast depleted uranium (DU)

All materials have previously been used in currently NRC licensed source changers and radiation cameras

> NRC #2, June 19, 20187

THSC Payload Description

ContentsIridium 192 (Ir–192) capsules

Selenium 75 (Se–75) capsules

Licensed as Special Form

Contents limits1,500 Ci total limit

Maximum 150 Ci per capsule

Maximum of 10 capsules per package

> NRC #2, June 19, 20188

Regulatory Compliance Plan

Structural evaluations:

NCT compression and free drop, HAC free & puncture drops, by test

All other NCT and HAC load cases by analysis

Thermal evaluation by comparison to IR-100 thermal test:

Thermal test not necessary since DU shield not exposed following all free and puncture drop tests

IR–100 thermal test demonstrated no shielding degradation occurs provided DU shield remains protected by stainless steel body

Shielding evaluationNCT and HAC dose rates by test

> NRC #2, June 19, 20189

Certification Test Results

Test ObjectivesDemonstrate resistance to compressive force per

§71.71(c)(9)

Demonstrate no degradation in shielding capability of package occurs after a worst–case sequence of free and puncture drops

Demonstrate retention of special form capsules within the gamma shield

Free/Puncture drop tests performed at Oak Ridge National Laboratory, March 27-28, 2018

> NRC #2, June 19, 201810

Certification Test Results (con’t)Compression Test

Test per 10 CFR §71.71(c)(9), greater of:5 times weight of package (=1,650 lb) or

Equivalent of 13 kPa (2 lb/in2) multiplied by vertical projected area of package (=255 lb)

Applied force: 1,652 lb

Result: No deformation of package after 24 hrs

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Certification Test Results (con’t)Compression Test

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Certification Test Results (con’t)Free and Puncture Drops

Two full–scale, prototypic CTUs

Demonstration basis: radiation dose rates comply with §71.51(a)(2) radiation limits after series of free and puncture dropsUse of actual radioactive source capsules

Post–test readings versus pre–test readings

Tests Performed per 10 CFR §71.73Five Free Drops

Two Puncture Drops

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Test ConditionsFor high-impact drops, DU temperature cold (~ -20 °F)

Bottom down orientation, NCT & HAC

For maximum crush deformation and/or high-impact drops, temperature was at NCT hot condition (~140 °F)

Top down, CG–over–corner

Top down

Side

All puncture drop tests were performed with CTUs at post-free drop test temperature condition

> NRC #2, June 19, 201814


One NCT, 4–ft free bottom down drop, Cold (CTU-1)

Four HAC 30–ft free dropsBottom down, Cold (CTU-1)

Top down, CG-over-corner , Hot (CTU-1)

Top down, Hot (CTU-2)

Side, Hot (CTU-2)

Two puncture dropsTop down, CG-over-corner (CTU-1)

Side (CTU-2)

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Data collectedSurface temperature of DU shield

Photographs

Normal & high speed video

MeasurementsCrush distance, puncture damage (if any)

Radiation Dose Rates Pre- and post-test

No reduction in shielding capability recorded

> NRC #2, June 19, 201816

Certification Test Results (con’t)CTU-1

NCT 4-ft Bottom Down Drop, DU Surface -19 °F

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HAC 30-ft Bottom Down Drop, DU Surface < -7 °F

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HAC 30-ft CG-Over-Top Corner Drop, CTU Temp 156 °F

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HAC 40-inch Puncture on CG-Over-Top Corner Damage, CTU Temp 70 °F

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HAC 30-ft Top Down Drop, DU Surface 153 °F

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HAC 30-ft Side Drop, DU Surface >120 °F

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HAC 40-inch Puncture on Side Damage, CTU Temp 85 °F

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Certification Test Results (con’t)CTU-1 Post-Test Results

Inspection of the mounting plate/lock boxes experienced no damage from NCT or HAC drop tests

Brass dust caps dislodged (not lock wired for test)

> NRC #2, June 19, 201824

Certification Test Results (con’t)CTU-2 Post-Test Results

Inspection of the mounting plate/lock boxes revealed mounting plate was bowed inward from HAC side drop impact:0.380 inch at Tube 6 (adjacent to side impact)

0.233 inch at Tube 10 (180° from side impact)

Deformed mounting plate slightly moved lock box/source pigtail from the designed stored position in DU shield

Brass dust caps dislodged (not locked wired in test)

> NRC #2, June 19, 201825

Certification Test Results (con’t)CTU-2 Post-Test Results (con’t)

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Certification Test Results (con’t)CTU-2 Post-Test Results (con’t)

View of Tube 6 (left) and Tube 10 (right) illustrating post-test mounting plate deformation

> NRC #2, June 19, 201827

Certification Test Results (con’t)Details of DU Shield

DU shields procured from Aerojet Ordnance TNCTU-1 Shield (2012):

Shield Weight: 235 lb

One source tube damaged during casting, only (9) source tubes useable

Gross package weight: 328 lb

CTU-2 Shield (2014): Weight: 225 lb

During casting, upper mold broke, which resulted in a 2-step casting process

All (10) source tubes useable

Gross package weight: 319 lb

> NRC #2, June 19, 201828

Certification Test Results (con’t)Radiation Surveys

Both pre-test and post-test surveys were performed using actual Ir-192 special form capsules:

Pre-Test: 110 Ci/capsule (total of 1,110 Ci max)

Post-Test: 105 Ci/capsule (total of 1,050 Ci max)

During CTU-2 post-test survey, it was discovered that a trap plate was inadvertently installed in lock boxes on CTUs

Plate utilized for the IR-50 Source Changer

Prevented source capsules from being positioned in designed stored position near/against titanium hub

Effect was to increase measured surface dose rates

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Certification Test Results (con’t)Radiation Surveys (con’t)

CTU-1 measured dose ratesTrap plate installed for both pre-test & post-test surveys

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CTU-2 measured dose ratesTrap plate installed for both pre-test & post-test surveys

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CTU-2 measured dose ratesMaximum surface dose rate comparison with & without trap

plate installed

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Certification Test Results (con’t)Summary

Regulatory ComplianceMinimal damage to package from free and puncture

drops IAW 10 CFR §71.71 and §71.73

No dislodgement of source capsules

Pre-test and post-test radiation dose rates comply with 10 CFR §71.47(a) [NCT] and §71.51(a)(2) [HAC], respectively

> NRC #2, June 19, 201833

Verification of Shield Integrity

Based on certification testing of two separate DU shields, acceptance tests in application for shield integrity will include:Ultrasonic examination at supplier’s facility

Shielding test upon receipt at INC facility

Dimensional inspection

DU shields not passing all acceptance tests will not be utilized in a THSC package

> NRC #2, June 19, 201834

Submittal Schedule

Certification testing – CompletedCompression Test - September 2017

Free and Puncture Drops - March 2018

Radiation Survey Tests – March (Pre-) & May (Post-) 2018

Anticipate submittal of application to NRC for Type B(U)–96 certification – 4th Quarter 2018

Planning on approximately 5 months to first round RAIs

> NRC #2, June 19, 201835

IR–THSC Package

Summary

industrial nuclear company, inc. ten hole source changer

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