CERN ATOMTEX BDKG-24 Manuale utente

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

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 2 of 93

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.

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 3 of 93

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

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 5 of 93

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

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 6 of 93

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).

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

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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.

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 8 of 93

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

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 9 of 93

Name of task

20. Break vacuum

Exposed people

Local dose rate

0.1 µSv/hr

Workforce

1 person

Time needed

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

REFERENCE EDMS NO. REV. VALIDITY

TOF-TAR-PRD-0001 1867100 1.0 RELEASED

Page 10 of 93

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

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

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