Vault-BL1A Shielding Plug

plantcitybusinessΠολεοδομικά Έργα

26 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

78 εμφανίσεις

Vault
-
BL1A Shielding Plug

Sept 26, 2012


L.Lee

N

UCN Installation
-
1: 2014 Shutdown

Shielding “Plug” will need to be reconfigured

“Existing” Vault
-
BL1A Shielding Plug

What is the required shielding “plug” thickness between the Vault & BL1A?

When UCN beamline (septum & dipole) is installed, the shielding “plug”

between the Vault and BL1A tunnel will need to be reconfigured.

CYCL.

VAULT

BL1A

Vault
-
BL1A/1U Shielding Plug

Footprint of the shielding plug will be reduced slightly.

What are the requirements for the “new” shielding plug with BL1U installed?

How thick does the “new” shielding plug need to be?

CYCL.

VAULT

BL1A

BL1U

Vault
-
BL1A/1U Shielding Requirements

What are the requirements for the shielding “plug” with BL1U installed?


(Preliminary discussions with A.Trudel)


-

Prompt Radiation Hazard (PRH) Study


-

Based on occupancy in 1A/1U tunnel with beam ON in vault:




Dose rate in accessible areas < 100
m
Sv/hr




Annual personnel dose limits from chronic losses < 1 mSv


-

Dose rate constraints for various accidental full beam loss scenarios


(e.g. accidental insertion of 1A stripper, failure of 2AVB1 bender)




Dose rate outside shielding < 50 mSv/hr




Dose limit per full loss event < 1 mSv


How thick does the “new” shielding need to be?


-

Based on dose rates from various scenarios mentioned above


(PRH study, simulation studies, surveys/measurements)


-

Design to maintain overall effective thickness (
r

t ) in shielding “plug”



Is a Shielding
-
Plug “Task Force” needed?


Layout Option
:

Maintain effective thickness of shielding



Replace some of the concrete w/ higher density mat’l

Vault

Elements

Higher Density Shielding Materials

Replacing some concrete blocks with higher density material


Issues/Considerations:


-

Re
-
use existing concrete blocks, as much as possible


Costs, Storage


fewer removed blocks (potentially activated)


-

Combine with denser (Steel) blocks


-

Combine with denser (Hematite
-
aggregate concrete) blocks



Concrete/Hematite aggregate shielding blocks (from NSS)


Variable/Customizable density (3.8
-

5.7 g/cc)


Used at reactors (Ontario


25 yrs), SNS, TRIUMF


NSS has worked with Ellis
-
Don, Burnco, LaFarge


NSS Meeting at TRIUMF on Sep.10, 2012 (M.Chopra)


Layout Options (“First
-
Pass” study):

(1) Replace some concrete w/ steel blocks (

~

3:1 thickness ratio)

(2) Replace some concrete w/ aggregate blocks (

~

2:1 thickness ratio)

Shielding Plug Layout: Option
-
1

Replace some concrete with steel blocks (

~

3:1 thickness ratio)

“First
-
Pass” study using SolidWorks 3D
-
Model of Meson Hall West


SolidWorks 3D
-
Model of Meson Hall West

CYCL.

VAULT

BL1A

TUNNEL

Beampipe

to BL1A

Immovable

Block

East (to T1,

T2, TNF)

Existing Shielding (Layers A
-
D)

(UPPER LAYERS E
-
J HIDDEN)

Vault
-
1A

“Plug”

Existing Shielding (Layers A+B+C)

(LAYER D & UPPER LAYERS E
-
J HIDDEN)

Existing Shielding (Layer A+B)

(LAYERS C+D & UPPER LAYERS E
-
J HIDDEN)

Existing Shielding (Layer A)

(LAYERS B+C+D & UPPER LAYERS E
-
J HIDDEN)

“New” Shielding Layout (Layer A)

“FIRST
-
PASS” STUDY : OPTION
-
1 (STEEL)

Blue



steel, new

Yellow



concrete, new (w/ cut
-
out)

“New” Shielding Layout (Layer A+B)

“FIRST
-
PASS” STUDY : OPTION
-
1 (STEEL)

Blue



steel, new

Yellow



concrete, new (w/ cut
-
out)

“New” Shielding Layout (Layer A+B+C)

“FIRST
-
PASS” STUDY : OPTION
-
1 (STEEL)

Blue



steel, new

Yellow



concrete, new (w/ cut
-
out)

“New” Shielding Layout (Layer A+B+C+D)

“FIRST
-
PASS” STUDY : OPTION
-
1 (STEEL)

Blue



steel, new

Yellow



concrete, new (w/ cut
-
out)

List of “Removed” Concrete Blocks:


List of “New” Blocks:

(2) 12’ x 6’ x 4’

(Layer A, C)


(5) 2’ x 3’ x 6’ steel

(Layer A)

(7) 2’ x 3’ x 6’

(Layer A)


(1) 2’ x 3’ x 6’ steel
*

(Layer A)

(1) 6’ x 3’ x 2’

(Layer C)


(2) 2’ x 3’ x 6’ concrete
*


(Layer A)

(5) 2’ x 3’ x 2’

(Layer D)


(1) 6’ x 3’ x 2’ concrete
*


(Layer C)






(6) 2’ x 3’ x 2’ steel

(Layer D)

(38% of existing)





*block with “cut
-
out” for 1U beampipe

Vault
-
1A Shielding Layout (Layers A
-
D)


EXISTING vs “NEW” (OPTION
-
1, STEEL)

List of “Removed” Concrete Blocks:


List of “New” Blocks:

(2) 12’ x 6’ x 4’

(Layer A, C)


(7) 2’ x 3’ x 6’ aggregate

(Layer A)

(6) 2’ x 3’ x 6’

(Layer A)


(1) 2’ x 3’ x 6’ aggregate
*

(Layer A)

(5) 6’ x 3’ x 2’

(Layer A, B, C)


(2) 2’ x 3’ x 6’ concrete
*


(Layer A)

(4) 2’ x 3’ x 2’

(Layer D)


(1) 6’ x 3’ x 2’ concrete
*


(Layer C)






(8) 2’ x 3’ x 2’ aggregate

(Layer D)

(42% of existing)





*block with “cut
-
out” for 1U beampipe

Vault
-
1A Shielding Layout (Layers A
-
D)


EXISTING vs “NEW” (OPTION
-
2, AGGREGATE)

More Information on

High
-
density Shielding

Blocks from NSS

(Nuclear Shielding Supplies)

High Density Concrete w/ Aggregate

Nuclear Shielding Supplies and Services (NSS)


Concrete/Hematite aggregate shielding blocks


HD (3.8
-
5.7 g/cc)


-

Hematite (Fe
2
O
3
): Coarse [1”


3/8”] & Fine [3/8”


100 mesh] components


Established history of use at reactors and accelerators


-

Ontario Hydro (20 yrs, P.Mukherjee: Study of long
-
term effect on HD concrete at reactors)


-

BNL AGS (ilmenite, roof beams: 33 ton, blocks: 21, 11, 0.5


2 ton)


-

SNS Tunnel (hematite, 3.85g/cc, poured in place, 2000 m
3
)


-

TRIUMF


NSS has worked with Ellis
-
Don, Burnco, LaFarge


Used in both radiation & non
-
radiation applications:


-

high density radiation shielding


-

linear accelerator vaults & treatment rooms


-

high dose rate HDR rooms


-

mass concrete projects


-

high density concrete applications columns


-

gravity seawall, coastal protection & breakwater structures


-

bridge counterweights


-

ballast for ocean vessels and off shore platforms


-

noise and vibration dampening

Coarse Hematite

Fine Hematite

Charles River Suspension Bridge in Boston, MA

NSS HD
-
concrete
(Non
-
radiation Applications)

HD
-
concrete

Back
-
spans

Breakwater Structure Utilizing High Density Concrete

NSS HD
-
concrete
(Non
-
radiation Applications)

EXTRA

2011

2015

2014

2013

2012

2016

2017

ACTIVITY

J A J O

J A J O

J A J O

J A J O

J A J O

J A J O

J A

Schedule( 2010
-
2016 )

2011

2015

2014

2013

2012

2016

2017

Cleanup M11,1A/1B roof
-
beam

Dismantle PIENU & M13
-
DS

MESON HALL (& Vault):

Core M13 I
-
block

Shielding

UCN APPARATUS:

Spallation Target & R/H

UCN Source

BEAMLINE 1U:

Kicker

Septum

Dipole

Beamline (incl Quads, PS,…)

Design & Review

Order/Fabricate/Deliver

Test

Test

Order/Mod

Order/Fabricate

Design & Review

Design & Review

Order/Fabricate

Install

Test

Specify/Conceptual design

Design/Fabricate

Install

UnInstall

Procure shielding blocks

Design & Review


Install

COMMISSION @ TRIUMF

Beamline Commissioning

HELIUM LIQUEFIER:

Upgrade He Liquefier System

He Liquefier System

Procure

UCN Source Commissioning

Install/Test & Run @ RCNP

Procure/Install

Install

Kicker Ceramic Beamtube

Install

Design/Order

Fabricate

Install

Test

MILESTONES

Shutdown Activities

Activities Elsewhere

(KEK, RCNP, CERN, Acsion)

Non
-
Shutdown Activities

Mod. 1VQ4/Q5; BL1V & Shld

Install

Install

Install

Dismantle M13
-
US, Mod.Shld

UCN Schedule (Draft)

Design/Order/Fabricate

Test

Install

Install

Design/Fab
r

UCN Installation Schedule

N

2014 Shutdown

2015 Shutdown

2015 Non
-
Shutdown

& 2016 Shutdown