CERN ATOMTEX BDKG-24 User manual

EDMS NO. REV. VALIDITY
1867100 1.0 RELEASED
REFERENCE
TOF-TAR-PRD-0001
Date: 2019-04-11
CERN
CH1211 Geneva 23
Switzerland
[DO
CUMENT TYPE]
nTOF –Target 2 Removal
Handling Tasks
(Sequence of Operations)
Abstract –This document outlines the tasks needed to remove n_TOF Target 2 in order
to allow its replacement with Target 3. The tasks include removal of the equipment and
items in the vertical beam pipe to gain access to the n_TOF target 2 from the technical
gallery. It is assumed the detectors and the associated equipment have been removed
before this work starts. This document identifies tasks where remote handling will be
required.
DOCUMENT PREPARED BY:
DOCUMENT CHECKED BY:
DOCUMENT APPROVED BY:
O. Aberle,
K. Kershaw,
JL. Grenard,
JF. Gruber,
S. Girod,
JM. Martin,
LR. Buonocore,
N. Roget
M. Calviani,
D. Grenier,
J. Vollaire,
F. Pozzi,
L. Ulrici,
M. Di Castro,
F. Dragoni,
A. Pardons,
O. Prouteau,
C. Bertone
S. Gilardoni,
M. Brugger,
M. Nonis,
I. Ruehl,
A. Masi,
R. Folch,
S. Roesler

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HISTORY OF CHANGES
REV. NO.
DATE
PAGES
DESCRIPTIONS OF THE CHANGES
0.0
0.1
0.2
0.3
0.4
0.5
0.6
1.0
2017-08-04
2017-08-10
2017-08-16
2017-08-18
2018-05-09
2018-11-13
2019-01-08
2019-03-29
-
-
-
-
-
-
-
-
First draft with illustrations based on discussions between
O.Aberle, K.Kershaw and nTOF EAR2 beam line installation
procedure document.
Based on discussions between O.Aberle and K.Kershaw an
abstract and scope were added to give a better overview.
More photos and dimensions were added to give clarification
for certain operations. The dump removal process was also
added between 80-90.
Estimations for time and hands needed have been added
along with some minor superficial changes.
Following a meeting with RP, some areas of work have been
added along with clarification that most items above the
technical gallery will want to be reused.
Document ready for Engineering Check
Following meetings with all the groups involved, and testing of
certain tasks, the process has been updated.
Following comments after the last release, the document has
been updated.
Updates to draining procedure, better pictures.

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TABLE OF CONTENTS
1. Introduction .............................................................................................................................................................................6
2. Scope ...........................................................................................................................................................................................7
3. Tasks ...........................................................................................................................................................................................7
10. Preparation of area (EAR2 & Technical Gallery)............................................................................................................................8
20. Break vacuum ...............................................................................................................................................................................................9
30. Disconnect filter box and permanent magnet vacuum tubes..................................................................................................10
40. Remove magnet.........................................................................................................................................................................................11
50. Remove filter box ......................................................................................................................................................................................12
60. Fit cover plate to vacuum chamber 1 ...............................................................................................................................................13
70. Remove rails and aluminium ventilation sealing plate .............................................................................................................14
80. Remove concrete shielding bricks ......................................................................................................................................................15
90. Remove upper bellow..............................................................................................................................................................................16
100. Install supporting plate over pit ......................................................................................................................................................17
110. Remove connecting pipe......................................................................................................................................................................18
120. Remove vacuum chamber upper parts..........................................................................................................................................19
130. Remove pillar structure and detector assembly ........................................................................................................................20
140. Remove cover, lead, vacuum valve, transition flange, Al vacuum chamber....................................................................21
150. Remove borated polyethylene elements and B4C......................................................................................................................22
160. Remove collimator-2.............................................................................................................................................................................23
170. Remove steel balls..................................................................................................................................................................................24
180. Remove big collimator vessel and vacuum chamber 4............................................................................................................25
190. Remove the flange support and the sliding pads.......................................................................................................................26
200. Remove concrete ring...........................................................................................................................................................................27
210. Remove support for steel sphere system .......................................................................................................................................28
220. Prepare area for Target #2 removal (items below the gallery)..........................................................................................29
230. Remove supporting cover over pit...................................................................................................................................................30
240. Remove inner collimator from vacuum chamber......................................................................................................................31
250. Remove remaining parts over long vacuum chamber.............................................................................................................33
251. Install cover over vacuum chamber................................................................................................................................................34
252. Remove steel shielding from around vacuum chamber..........................................................................................................35
260. Remove long vacuum chamber.........................................................................................................................................................36
270. Install monorail above shaft..............................................................................................................................................................38
280. Load test monorail track.....................................................................................................................................................................39
290. Remove supporting cover over pit...................................................................................................................................................40

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300. Remove support frame for vacuum chamber 1..........................................................................................................................41
310. Remove square shielding.....................................................................................................................................................................42
320. Remove support for square shielding.............................................................................................................................................43
330. Drain upper section of pipes from the cooling station ............................................................................................................44
331. Remove round shielding block 4 ......................................................................................................................................................45
332. Install the solid version of round shielding block 4 ..................................................................................................................46
335. Drill and drain the pipes at the top.................................................................................................................................................47
336. Remove solid version of shielding block 4 ....................................................................................................................................48
340. Remove round shielding blocks 3 and 2 ........................................................................................................................................49
350. Remove shielding block 1....................................................................................................................................................................50
355. Install the solid version of shielding block 1................................................................................................................................52
360. Remove pipe retaining screws ..........................................................................................................................................................53
370. Pull pipes away from wall...................................................................................................................................................................54
380. Remove bracket top plates .................................................................................................................................................................55
390. Fix pipes out of the way against wall .............................................................................................................................................56
400. Pump out water from this level ........................................................................................................................................................57
410. Remove ladders and equipment and prepare for the removal of the block....................................................................58
420. Remove solid version of round shielding block 1 .......................................................................................................................59
430. Remove centring plate .........................................................................................................................................................................60
440. Raise target to technical gallery whilst pipes are cut .............................................................................................................61
450. RP measurements of the target ........................................................................................................................................................63
460. Remove the target from the Tech Gallery and lower it through the trapdoor into the draining tray .................64
470. Drill hole in target to drain moderating circuit.........................................................................................................................66
480. Drill holes in target to drain cooling circuit................................................................................................................................67
490. Lift the target, place it in the Tech Gallery ..................................................................................................................................69
500. Lower the target inside the shielding box ....................................................................................................................................70
510. Pull the target out from below the trap door .............................................................................................................................71
520. Take the shielding box out of the trolley, and into the PSI container................................................................................72
530. Remove the PSI container out of ISR8............................................................................................................................................74
540. Place sections of cut pipe inside containers.................................................................................................................................75
550. Place the solid shielding block 1 back in the pit.........................................................................................................................76
560. Cooling pipes removal. Disconnect the 4 pipes...........................................................................................................................77
570. Disconnect the lower end of the pipes............................................................................................................................................78
580. Place slings on the moderating and cooling water pipes to support them. ....................................................................79
590. Remove the supports attaching the pipes to the wall..............................................................................................................80
600. Remove the pipes using the monorail ............................................................................................................................................81

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610. Cut the pipes and place them into containers.............................................................................................................................82
620. Pipe assembly removal, cooling station side ...............................................................................................................................83
630. Pipe assembly removal, pit side........................................................................................................................................................84
640. Pipe assembly removal, extraction and cutting .........................................................................................................................85
650. Technical gallery cleaning..................................................................................................................................................................86
660. Remove dump core insert ...................................................................................................................................................................87
670. Remove Cap around outer beam dump.........................................................................................................................................88
680. Remove outer dump blocks ................................................................................................................................................................89
690. Remove inner beam dump blocks ....................................................................................................................................................90
700. Remove dump concrete ring (+ vacuum chamber) ..................................................................................................................91
710. Remove support plate...........................................................................................................................................................................92
4. List of Annexes ..................................................................................................................................................................... 93
4.1 n_TOF EAR2 Beam Line Installation Procedure (EDMS: 1302710) ..............................................................................93
4.2 nTOF Target 2 removal –Schedule (EDMS: 2066754) ..............................................................................................................93

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1. Introduction
This document explains in a visual format the handling tasks needed to remove the
n_TOF beam pipe equipment to gain access to the target area and the tasks needed to
remove and dismantle Target 2 itself. In this document, “handling” covers any tasks
where human or remote intervention is needed in the area.
The initial removal process laid out in this document is based upon the n_TOF EAR2
beam line installation procedure document (EDMS: 1302710).
The first version of the document illustrated the tasks without specifying how they will
be carried out; however, the format of the document was designed to allow more
information to be easily added as the necessary procedures were and will continue to
be developed.
The majority of these tasks will be carried out manually or ‘hands-on’. Remote handling
will be used for all the tasks related to the handling of the target to optimize the dose
to personnel.
Important CATIA models:
-ST0332721_01 –n_TOF EAR2 Area
-ST0083420_01 –Target 2
Important drawings:
-CERN Drawing Number: TOFEAR2_0154
A schedule for this tasks has been drafted. At the time of writing, it is under discussion
(EDMS 2066754).

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2. Scope
This document covers the handling tasks needed for the removal of the equipment
within the vertical beam pipe and then the removal and dismantling of the old
Target 2, so that the new target 3 can be installed. In the figure below, it can be
seen that the area can be split into two sections, above the technical gallery and
below. It is assumed that the detectors have been removed from the experimental
areas.
3. Tasks
The tasks are described on task sheets with 1 task stage per sheet. Initial task
numbering is in multiples of 10 to allow additional tasks to be added or increased
levels of granularity as the preparation work continues.

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Name of task
10. Preparation of area
(EAR2 & Technical Gallery)
Exposed people
Local dose rate
0.1 µSv/hr
Workforce
5 people
Time needed
2 weeks
Calculated dose
Responsible
EN-EA
Involved
EN-STI/ EN-HE/ EN-CV/
EN-SMM/ HSE-RP
Comments:
-Radiation Protection prep (survey)
-Cleaning and plastic floor foil.
-Installing fenced area in ISR (Simple
Controlled Radiation Area).
-Create storage area in ISR (ISR8 Storage
Area).
-Opening of shielding wall in technical gallery.
-Open technical gallery.
Magnet and filter
box
Collimator 2 &
Vacuum Vessels
EAR2 and
Detector
ISR8 Storage Area
Technical Gallery
Trap Door
ISR Ground Level
ISR Exit
Target
Technical Gallery

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Name of task
20. Break vacuum
Exposed people
Local dose rate
0.1 µSv/hr
Workforce
1 person
Time needed
1h
Calculated dose
Responsible
EN-EA
Involved
EN-EA/ HE-RP/ TE-VSC
Comments:
The valves that allow the venting can be operated
from EAR2.
EAR2 and
Detector

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Name of task
30. Disconnect filter
box and permanent
magnet vacuum tubes
Exposed people
Local dose rate
0.5 µSv/hr
Workforce
2 people
Time needed
2h
Calculated dose
Responsible
EN-EA
Involved
EN-EA/ TE-VSC
Comments:
Disconnection is necessary above and below the
filter box, and below the permanent magnet.
2.8m