DRAFT SOW Argon Condensers System 1 and 2 Jul 18 2024.pdf

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US

LBNF/DUNE-US

Argon Condensers Systems 1 and 2

Scope of Work

Document Number: EDMS 3136185

Argon Condensers Systems 1 and 2 Scope of Work

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page ii

Document Approvals

Signatures Required Signature & Date Approved

Originator: David Montanari

Approver:

Approver:

Approver:

Approver:

Approver:

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Revision History and Version Control

This version of the document may not be the current or approved revision. The current revision is maintained in the LBNF/DUNE Document Management System (DocDB) or the Engineering & Equipment

Data Management Service (EDMS) where internal Project document approvals are managed. DocDB can be accessed through the web by authorized users (https://docs.dunescience.org/), and EDMS can be accessed through the web at https://edms.cern.ch. This document can be identified by the revision date as indicated in the Version Control Table below.

The current approved version is always available in DocDB or EDMS.

Author Revision Date Location (EDMS) Description of Changes

David Montanari 05/06/2024 3136185 First draft.

David Montanari 05/17/2024 3136185 Added schedule and assistance during engineering.

David Montanari 05/30/2024 3136185 Added updated flow diagram.

David Montanari 07/17/2024 3136185 Updated schedule.

Matt Maciazka 07/18/2024 3136185 Updated text.

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Table of Contents

Document Approvals .................................................................................................................................... ii

Revision History and Version Control .......................................................................................................... iii

List of Figures ................................................................................................................................................ v

List of Tables ................................................................................................................................................ vi

Acronyms and Abbreviations ...................................................................................................................... vii

1 Scope of the Document ..................................................................................................................... 1-1

2 Introduction ....................................................................................................................................... 2-1

3 Scope of Work .................................................................................................................................... 3-1

3.1 General Description .................................................................................................................. 3-1

3.2 Modes of Operation ................................................................................................................. 3-2

3.3 Components of the System ...................................................................................................... 3-2

4 Estimated Schedule ............................................................................................................................ 4-8

References ................................................................................................................................................. 4-1

Appendix A ................................................................................................................................................. 4-2

Appendix B ................................................................................................................................................. 4-3

Appendix C ................................................................................................................................................. 4-4

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List of Figures

Figure 3-1: Argon Condensers System on mezzanine of cryostat in North Cavern. Approximate location of battery limits in dashed black. ................................................................................................................... 3-2

Figure 3-2: Top view of Argon Condensers System on mezzanine of cryostat in North Cavern. Approximate location of battery limits in dashed black. ................................................................................................. 3-3

Figure 3-3: Detailed view of Argon Condensers System on mezzanine of cryostat in North Cavern.

Approximate location of battery limits in dashed black. ........................................................................... 3-3

Figure 3-4: Conceptual envelope of each of the 6 Argon condensers. ...................................................... 3-4

Figure 3-5: Conceptual envelope of each of the 6 LN2 Phase Separators. ................................................ 3-5

Figure 3-6: Conceptual envelope of each of the 4 LAr Phase Separators. ................................................ 3-6

Figure 3-7: Conceptual envelope of the pipes associated with each Argon condenser. ........................... 3-7

Figure 3-8: Argon condenser and desuperheater. ..................................................................................... 3-8

Figure 4-1: Preliminary schedule for engineering, manufacturing and installation of scope.................... 4-1

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List of Tables

No table of figures entries found.

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Acronyms and Abbreviations

Acronym Definition

CUC Central Utility Cavern

DUNE Deep Underground Neutrino Experiment

FRA Fermi Research Alliance LLC

GAr Gaseous Argon

LAr Liquid Argon

LBNF Long-Baseline Neutrino Facility

SURF Surf Underground Research Facility

VFD Variable Frequency Drive

Argon Condensers Systems 1 and 2 Scope of Work Scope of the Document

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-1

1 Scope of the Document

This document defines the Scope of Work for the Argon Condensers System 1 and 2 for the Long-Baseline

Neutrino Facility (LBNF) [1].

2 Introduction

LBNF (http:/lbnf-dune.fnal.gov/) will provide the infrastructure necessary to support the massive neutrino detectors located deep underground at the Sanford Underground Research Facility (SURF) in Lead, SD.

The Deep Underground Neutrino Experiment (DUNE) will employ four (4) such detectors, housed in cryostats requiring almost 70,000 tons of liquid argon (LAr), about 17,500 tons for each cryostat. DUNE

(http://www.dunescience.org/) is expected to achieve transformative discoveries, making definitive determinations of neutrino properties, examining the dynamics of supernovae that produced the heavy elements necessary for life, and probing the possibility of proton decay.

3 Scope of Work

The scope includes the engineering, manufacturing, testing and delivery of the Argon Condensers Systems supporting cryostats 1 and 2. Delivery is to the LBNF warehouse facility in Rapid City, South Dakota, USA.

The installation is performed by FRA under a different Subcontract with the possibility to assist during installation and/or to perform the installation as well. Appendix A shows the Process Flow Diagram of the cryogenic installation. Argon Condensers Systems 1 and 2 are items #12 and #13. Appendix B includes a preliminary list of the scope supplied by FRA.

3.1 General Description

Each Argon Condensers System consists of cryogenic vacuum insulated vessels, pipes and valves, and instrumentation to recondense the gaseous Argon (GAr) boil off from the cryostat, send the recondensed

LAr to the purification system and return the purified LAr from the purification system back to the cryostat.

An important feature of each system is the desuperheater, which removes heat from the boiloff GAr before it enters the condensers (see Table 3-1 also). There are two systems, one serving the Vertical Drift detector in the cryostat located in the South Cavern (VD) and one serving the Horizontal Drift detector located in the cryostat in the North Cavern (HD). Each cryostat has its own Argon Condenser System, and they are functionally identical. The layout of the equipment that serves the cryostat in the North Cavern is symmetrical to that in the South Cavern with respect to the Central Utility Cavern (CUC).

http://lbnf-dune.fnal.gov/ http://www.dunescience.org/

Argon Condensers Systems 1 and 2 Scope of Work Scope of Work

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3.2 Modes of Operation

The Supply shall condense gaseous argon via liquid nitrogen evaporation and transfer liquid argon from the purification system to the cryostat and from the condenser to the purification system. To these ends, the Supply shall operate under the modes described in Table 3-1.

Table 3-1 Argon Condensers Systems modes of operation

Mode Name Description

Cryostat

Cooldown1 / Fill

GAr enters the underground space via the Ross Shaft piping and makes its way to the CUC. The GAr at the CUC entrance transfers to the GAr purification filters, and then directs purified GAr to the Supply. The Supply recondenses the Argon via nitrogen fueled condensing and sends it to the cryostat for cooling/filling.

GAr Recovery and Recondensation

Due to small heat ingress, LAr will boil off into a vapor gas within the cryostat. This GAr will be removed from the top of the cryostat through cryogenic feedthroughs and vent line to the Condensers. The exiting GAr is directed to the heat exchanger within the Condenser (part of Supply). It is then cooled against a stream of LN2 and condensed back into a liquid.

Argon Phase Separators

Purified LAr from the CUC goes back to a Detector Cavern where it passes through LAr Phase Separators (part of Supply) and is then used to cool down and fill the cryostats. GAr from Phase Separators sent to the Condensers.

4 Desuperheater Pre-cool GAr with LAr before the GAr is sent to the Condenser.

Nitrogen Phase

Separators

LN2 from the refrigeration system within the CUC is withdrawn from the storage tanks and supplied via a transfer line to the Nitrogen Phase Separator (part of Supply). LN2 is withdrawn from the bottom of the Nitrogen Phase Separator and directed to the Argon Condenser.

1 Cooldown – only for the cryostat located in the North Cavern

3.3 Components of the System

The list of vessels for one system includes:

- Argon condensers (6 units, each one with 50 kW of duty).

- Argon phase separators (4 units).

- Nitrogen phase separators (6 units, matching the Argon condensers).

- Circulation valve boxes (6 units, matching the Argon condensers, pumps are supplied by FRA).

- Other valve boxes as logistics allows it.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-2

Additional components include:

- Interconnecting piping, valves and instrumentation connecting the Argon condensers to the

Nitrogen phase separators on the Nitrogen side and the Argon condensers to the GAr boil-off line from the cryostat and the circulation valve boxes on the Argon side.

- Interconnecting piping, valves and instrumentation connecting the Argon phase separators to the

LAr pipe coming from the purification system and the LAr delivery pipes to the cryostat. There is also a GAr line going back to the Argon condensers.

Figures 3-1 to 3-3 show a concept with not-to-exceed envelopes of the Argon Condensers System serving the cryostat in the North Cavern. Figures 3-4 to 3-6 show conceptual not-to-exceed envelops of each vessel. Figures 3-7 and 3-8 show additional details of each Argon condenser.

Figure 3-1: Argon Condensers System on mezzanine of cryostat in North Cavern. Approximate location of battery limits in dashed black.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-3

Figure 3-2: Top view of Argon Condensers System on mezzanine of cryostat in North Cavern. Approximate location of battery limits in dashed black.

Figure 3-3: Detailed view of Argon Condensers System on mezzanine of cryostat in North Cavern. Approximate location of battery limits in dashed black.

~7 .0 m

~29.0 m

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-4

Figure 3-4: Conceptual envelope of each of the 6 Argon condensers.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-5

Figure 3-5: Conceptual envelope of each of the 6 LN2 Phase Separators.

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Figure 3-6: Conceptual envelope of each of the 4 LAr Phase Separators.

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Figure 3-7: Conceptual envelope of the pipes associated with each Argon condenser.

Argon Condensers Systems 1 and 2 Scope of Work Estimated Schedule

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 4-8

Figure 3-8: Argon condenser and desuperheater.

4 Estimated Schedule

A tentative schedule for the Argon Condensers Systems 1 and 2 engineering, manufacturing and installation is shown in Figure 4-1. It assumes the procurement is made from Fermilab using realistic durations for the DOE review process and leveraging the existing IDIQ for the Argon Distribution

Equipment. The final milestone is the delivery of the systems at SURF in April 2027. The systems are then installed by FRA under a separate Subcontract with the possibility to assist during installation and/or to perform the installation as well.

Argon Condensers Systems 1 and 2 Scope of Work Estimated Schedule

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 4-1

Figure 4-1: Preliminary schedule for engineering, manufacturing and installation of scope.

Argon Condensers Systems 1 and 2 Scope of Work References

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 4-1

References

[1] LBNF/DUNE, "Cryostat and Cryogenics Infrastructure for the DUNE Far Detector (dune-doc-18838),"

December 2023. [Online]. Available: https://docs.dunescience.org/cgi-bin/sso/ShowDocument?docid=18838.

Argon Condensers Systems 1 and 2 Scope of Work Appendix A

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Appendix A

Process Flow Diagram of the cryo installation at the Far Site.

Argon Condensers Systems 1 and 2 Scope of Work Appendix B

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 4-3

Appendix B

Process Flow Diagram of the Argon Condensers System.

Argon Condensers Systems 1 and 2 Scope of Work Appendix C

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 4-4

Appendix C

The following scope is supplied by FRA:

- Installation services (see sections 3 and 4 for clarification also).

- Local warehouse storage for equipment.

- Transportation from local storage to place of installation underground.

- Mechanical structures supporting the equipment (2 levels).

- LAr circulating pumps (for integration in Subcontractor supplied circulation boxes) and VFDs.

- Temporary construction power.

- Permanent power.

- Compressed air to operate pneumatic valves.

- Industrial water.

- Controls cabinets (instruments and valves are to be installed with a TBD length of coiled cable.

FRA will connect the cable to the controls cabinets.

- Controls system (PLC, HMI, wiring and programming) to monitor and operate the system.

- Central monorail to position equipment on top of mezzanine for installation.

- Safety system for Oxygen Deficiency Hazard (sensors and safety PLC with alarms and strobes).

- Installation Coordinators.

- Permitting.

- Emergency and Medical services underground.

- Pipes connecting to this system from other systems. Size and type of interface (process and VJ pipes are DN sizes SCH 10, generally).

- 3D model integration of Subcontractor supplied scope with rest of equipment.