Beamline 8.3.2 Radiation ShieldingBeamline Design Review

17 April, 2006

Background

• Radiation leak discovered during annual white-light survey

• Surgical inspection revealed that:– Lead had shifted slightly– Corner section was not built

to specification

• Actions taken:– All lead lined hutches are to

be inspected and reviewed– All lead lined hutches moved

to Pre-Commissioned status

Shielding Inspection Criteria

• Verify that lead shielding is either:– Contiguous– Properly overlapped

• Ensure that shielding is secure and will not move

• Document and Archive

Shielding Defining Process

• Determine types of panels and shielding– Exploratory surgery– Compare to mfg drawings

• Develop repair plan:– Procedure for panel repair– Process for documentation

Shielding panel types

• Three types of shielding panels on the hutch:

–Structural (S)–Non-Structural (NS)–Corners (C)

• Additional regions–Doors–Support Structure over door

X-rays

PLAN VIEW

S

NS

C

NSNS

NSNS

NS

C

CC

S

S

Shielding Repair Approach

• Documentation– Generate tracking methods for each panel– Record panel information and repairs– Archive documents, drawings and photos.

• Three basic shielding repair “actions” to hutch panels:

– Skinning (structural & corners)– Securing (non-structural & doors)– Surveying (roof, H – panels, labyrinths)

8.3.2 Shielding Documentation

• Documentation note– Includes explanation– Defines numbering

system for panels and references drawing

– Provides repair forms for each panel

– Will serve to record repairs with forms and photos.

“Skinning” Example documentation

• Corner Panels– Fill out inspection sheet

– Photograph lead

– Re-skin with 5mm lead

– Cover with steel

“Skinning” Example documentation 2

• Door Support Structure– Fill out inspection sheet

– Re-skin with 5mm lead

– Photograph before install

– Cover with steel

“Securing” repair process

• Non Structural Panels– Inspect Lead– Photograph

• Overall Picture• Quadrants

– Install Support Bar– Install Cover Plate

“Securing” Inspection

A

B

C

D

“Securing” Support bar

“Securing” Assembly view

“Securing” Attachment view

“Securing” Example Documentation 2

• Doors– Remove doors – Cut into and Inspect lead– Photograph– Install Support Bars – Install Cover Plate– Re-install doors

“Surveying” Repair process

• Survey panels– Roof panels– H - panels– Labyrinths

• Survey Process– Inspect panels– Perform commissioning

survey per procedure– Complete forms

“Surveying” Commissioning checklist

“Surveying” Example documentation

• Roof panels– Inspect panels– Perform commissioning

survey per procedure– Complete forms

Open issues…..

• Complete documentation note with deails, process for repair and drawings for each panel on hutch

• Review of Commissioning radiation survey procedure – All concerns must be addressed regarding actual

process.

• Structural Calculations– INC is reviewing hutch design with added lead– If additional structure is needed a design could be

added to the corners

Plan of Attack

• Immediate Actions:–Non-Structural Panels

• Inspect/Repair/Secure–Doors

• Remove• Inspect/Repair/Secure

–Labyrinths• Remove/Inspect

–Roof Cover Plates• Fabricate Lead• Inspect/Install

– Inspect C-Channels on Joining Plates

• Near Term Actions–Structural Calculations–Re-Skin

• Structural Panels• Door Support

Structure• Corners

• During Re-Commissioning–Verify H-Channels on

Joining Plates–Survey All Panels

Questions?

Panels to be “Skinned”