LBNF NSCF RFI - ND Large Shaft Concept.pdf

February 18, 2026

Request for Information (RFI) LBNF/DUNE-US Near Detector Complex Large Shaft Concept

1. Purpose

Fermi Forward Discovery Group LLC (“FFDG”), the manager and operator of Fermi National Accelerator Laboratory (“FERMILAB”), under its Prime Contract Number 89243024CSC000002 with the United States Department of Energy (“DOE”), is leading the Long-Baseline Neutrino Facility (LBNF) Project to enable a world-class program in neutrino physics. The LBNF Project (https://lbnf-dune.fnal.gov/) provides the infrastructure for a new high-intensity neutrino beam generated at Fermilab to be aimed at neutrino detectors located nearly a mile underground at the Sanford Underground Research Facility (SURF) in Lead, SD.

The LBNF Near Site Conventional Facilities (NSCF) Subproject at Fermilab in Batavia, IL would like your thoughts and opinions concerning some questions on the LBNF/DUNE-US Project. The purpose of this Request for Information (RFI) is to obtain industry input regarding an alternative concept for the Near Detector Complex (NDC).

2. Background

Fermilab is evaluating the feasibility of an alternative concept for the NDC that includes replacement of two drop shafts and underground cavern included in Fermilab’s prior design of the Complex with a single or multiple larger approximately 210ft deep shafts, each requiring approximately 80ft of soil excavation depth and approximately 130ft of rock excavation depth. Under this alternative concept, instead of excavating an underground cavern, only the portion of rock needed to accommodate the roughly rectangular footprint of the detector string would be excavated within the footprint(s) of the larger shaft(s).

Craig G. Schmitz LBNF NSCF Procurement Manager

LBNF/DUNE-US /

Procurement P.O. Box 500, MS 123 Kirk Road and Pine Street Batavia, Illinois 60510-5011

USA

Mobile: 630.992.0933 schmitzc@fnal.gov mailto:schmitzc@fnal.gov

In one variant of this concept, a single shaft having a diameter of roughly 83ft would require about three times the soil excavation but only about one-half the rock excavation relative to Fermilab’s prior design.

The overall quantity of soil and rock excavation would be reduced by a small margin (a bit more than 10%).

In a second variant of this concept, two shafts would be required, one with a diameter of approximately 83ft and a second with a diameter of approximately 67ft. In this case, the volume of soil excavation would increase over five times, the volume of rock excavation would decrease by about one-third (relative to the current design), and the overall quantity of soil and rock excavation is about one-third greater.

Additionally, either of these two variants could potentially be shifted to the east up to 300ft. Since the beamline is on a 10% slope, a shift of 300ft would result in shaft and rock depth excavation of 30ft.

Because the alternative concept eliminates the underground cavern, off-axis measurements will have to be made by shifting the detectors vertically, rather than horizontally, requiring a vertical transport system for the detectors. This aspect of the concept is outside the scope of this RFI.

Fermilab is seeking to understand, in general terms, if any overall decreases in large shaft construction cost and/or savings from schedule efficiency under the alternative concepts would offset the increases in soil and/or total soil and rock excavation. Is the large shaft concept a significantly more economical approach relative to the current design? Fermilab is not soliciting proposals or seeking specific pricing data for its alterative design, but is rather seeking to understand whether, in the contractor’s judgment, either version of the proposed alternative concepts is likely to have a material effect on the overall project cost.

3. Respondents are encouraged to provide input on the following:

3.1 Single ~83 ft. dia. Shaft:

a. Would this new concept result in a longer or shorter duration than the 36-month duration represented in the previously issued RFP (see enclosed drawings)? If so, by how much?

b. Would this new concept result in a higher or lower proposal cost relative to the previously issued RFP (see enclosed drawings)?

c. If a cost reduction is applicable based on the new concept, what cost magnitude +/- 5% would the savings represent?

3.2 Single ~83 ft. dia. Shaft Shifted 300 ft. Upstream:

If the shaft is shifted upstream 300 ft., the depth of rock excavation would be reduced by 30 ft. and the volume of rock excavation for this shaft reduced by approximately 23%.

a. Would this new concept result in a longer or shorter duration than the 36-month duration represented in the previously issued RFP (see enclosed drawings)? If so, by how much?

b. Would this new concept result in a higher or lower proposal cost relative to the previously issued RFP (see enclosed drawings)?

c. If a cost reduction is applicable based on the new concept, what cost magnitude +/- 5% would the savings represent?

3.3 ~83 ft. dia. Shaft & ~67 ft. dia. Shaft:

a. Would this new concept result in a longer or shorter duration than the 36-month duration represented in the previously issued RFP (see enclosed drawings)? If so, by how much?

b. Would this new concept result in a higher or lower proposal cost relative to the previously issued RFP (see enclosed drawings)?

c. If a cost reduction is applicable based on the new concept, what cost magnitude +/- 5% would the savings represent?

3.4 ~83 ft. dia. Shaft & ~67 ft. dia. Shaft Shifted 300 ft. Upstream:

If the shafts are shifted upstream 300 ft., the depth of rock excavation would be reduced by 30 ft.

and the volume of rock excavation reduced by approximately 23%.

a. Would this new concept result in a longer or shorter duration than the 36-month duration represented in the previously issued RFP (see enclosed drawings)? If so, by how much?

b. Would this new concept result in a higher or lower proposal cost relative to the previously issued RFP (see enclosed drawings)?

c. If a cost reduction is applicable based on the new concept, what cost magnitude +/- 5% would the savings represent?

3.5 Construction Methodology:

The A/E-of-Record is proposing using slurry-shaft-diaphragm construction as a potentially economical alternative to ring beams-and-lagging and permanent liner for larger diameter shaft construction.

a. In the Chicago Underground Construction Market, are slurry shaft diaphragms commonly installed?

b. In the Chicago Underground Construction Market, are ring beams and lagging commonly installed?

c. In the Chicago Underground Construction Market, which permanent retention system (slurry versus ring beam) is more economically installed associated with the large shaft concept? If there is a cost differential, what is the difference +/- 5%?

4. Response Instructions

• Responses should be submitted in writing.

• Clearly identify your company name and point of contact.

• Submission deadline: March 5, 2026

• Submit responses electronically to: schmitzc@fnal.gov

5. Disclaimer

This RFI is issued for information-gathering purposes only. Participation is voluntary and does not confer any advantage or disadvantage in any future procurement. This RFI does not commit the United States Government to pay any costs incurred in the preparation or submission of any response to procure any supplies or services.

Respectfully, Craig G. Schmitz

LBNF/DUNE-US Near Site Procurement Manager

Enclosures:

1. Drawing G-ND-009, Rev. 4 dated May 20, 2024

2. Drawing S-ND-205, Rev. 4 dated May 20, 2024

3. Drawing S-ND-206, Rev. 4 dated May 20, 2024

4. Drawing SW-ND-300, Rev. 4 dated May 20, 2024 mailto:schmitzc@fnal.gov

EASEMENT

RIGHT OF WAY

K

IR

K R

O A

D

BEAMLINE

75' - 4" 50' - 0"

KIRK RD.

NEAR DETECTOR

(UNDERGROUND)

(LBNF 40)

NEAR DETECTOR

SERVICE BUILDING

ABSORBER HALL

(UNDERGROUND)

(LBNF 30)

ABSORBER

SERVICE BUILDING

DECAY REGION

(UNDERGROUND

(LBNF 20)

TARGET COMPLEX

PRIMARY BEAM

ENCLOSURE

(UNDERGROUND)

(LBNF 5)

PRIMARY BEAM

SERVICE BUILDING

MAIN

INJECTOR

EXTRACTION

ENCLOSURE

(UNDERGROUND)

MI-14

MI-10

POND G & H

INDIAN CREEK RD.

IN

D

IA

N

C R

E E K

R D

P O

N D

E

BEAMLINE

GIE

SE R

D.

EASEMENT

RIGHT OF WAY

303 East Wacker Drive Suite 1400 Chicago, IL 60601

312-373-7700 tel 312-373-6800 fax www.aecom.com

DRAWING NO.

SCALE:

REV.

REVISIONS

DESIGNED

DRAWN

CHECKED

Fermilab Long-Baseline Neutrino Facility

ISSUED FOR SOLICITATION

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/2

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G-ND-009

PROJECT NO. 6-15-12

LBNF NEAR SITE CONVENTIONAL FACILITIES

01D. PERRY

M. BINET/Z. ZHANG

G. GELDIS 05/2024

05/2024

05/2024

6-15-12_131.01.03.02.04.04.01_00_G-ND-009

OVERALL SITE PRESENTATION

G-ND-009SCALE: 1/64" = 1'-0" G-ND-009G-ND-009

ND + NDSB

OVERVIEW 11

ND + NDSB

OVERVIEW

NOT IN SCOPE

6-15-11

REV. DATE DESCRIPTIONS

04 05/20/24 ISSUED FOR SOLICITATION

SCALE: 1/4" = 1'-0"

SECTIONG

S-ND-202

(12) 7'-0" LONG ROCK

BOLTS EQ. SPC'D. @ 5'-0"

ELEVATIONS, STAGGERED

3" FIBER REINFORCED

SHOTCRETE (TYP)

20'-0" [6.10m] EXCAVATED DIAMETER

S-ND-207

SCALE: NOT TO SCALE

SECTIONF

S-ND-202

18'-0" [5.49m] INSIDE DIAMETER (CLEAR)

FLANGE BOLT

SETS OR JACK

AND WELD AS

REQUIRED GRADE 50 STEEL RIB

SETS W8x31 AT 4-FT

ELEVATIONS

K

S-ND-205

1/2" MIN STEEL TIE RODS

STAGGER EACH SET (TO

BE DESIGNED BY

CONTRACTOR)

WOOD LAGGING OR

STEEL LINER PLATE

CONCRETE COLLAR AND

FINAL SHAFT LINER BELOW

(SEE DETAIL 3 S-ND-207)

20'-6" [6.25m] MIN. INSIDE RING DIAMETER

℄ SECONDARY

EGRESS SHAFT

SCALE: 1/4" = 1'-0"

SECTIONK

S-ND-205

WOOD SHIM AS

REQUIRED (TYP)

TIE ROD

(STAGGERED)

TIE ROD

GRADE 50 STEEL RIB

SETS W8x31

4' -0

1.

m

(T

YP

4-FLANGE BOLTED

LINER PLATE

2' -0

0.

m

(T

YP

S-ND-207

20'-6" [6.25m] MIN. INSIDE RING DIAMETER

℄ SECONDARY

EGRESS SHAFT

TIE ROD

(STAGGERED)

TIE ROD

GRADE 50 STEEL RIB

SETS W8x31

4' -0

1.

m

(T

YP

S-ND-207

3" MIN WOOD

LAGGING (TYP)

LINER PLATE ALTERNATE

TIMBER LAGGING ALTERNATE

TO BE DESIGNED BY CONTRACTOR

TO BE DESIGNED BY CONTRACTOR

SECONDARY

EGRESS SHAFT

SCALE: 1/8" = 1'-0"

SECTIONN

S-ND-202

21'-0" [6.40m]

SEE SECTION G

15' LONG ROCK BOLTS

@ 6'x6' SPACING

NOTE:

ADJUST ROCK BOLT LOCATIONS

LOCALLY TO AVOID INTERFERENCE.

SCALE: 1/4" = 1'-0"

TYPICAL SPILING LAYOUT AT INTERSECTIONS1

S-ND-202

2' -0

0.

m

20°0'0"

STEEL SPILE

PRE-REINFORCEMENT

(SEE SPECIFICATIONS)

ADJUST POSITION (±1 FOOT

VERTICALLY AND/OR

HORIZONTALLY) OF SPILES

TO AVOID INTERFERING

WITH ROCK BOLTS

60°

3' -0

0.

m

1'-31 2" [0.39m] VARIES

3" FIBER-REINF

SHOTCRETE

SCALE: 1/4" = 1'-0"

DETAIL - ROCK SHEAR KEY1

S-ND-202

TEMPORARY SEAL

LOCAL EXCAVATION

AFTER STABILIZATION

OF SHAFT WALL

SEE STRUCTURAL

DRAWINGS FOR

DIMENSIONS OF FINAL

SHAFT LINER

FEETSCALE

1/4"=1'-0"

SCALE:

REV.

REVISIONS

DESIGNED

DRAWN

CHECKED

7/ 3/

:5

1:

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REV. DATE DESCRIPTIONS

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ISSUED FOR SOLICITATION

303 East Wacker Drive Suite 1400 Chicago, IL 60601

312-373-7700 tel 312-373-6800 fax www.aecom.com

DRAWING NO.

Fermilab Long-Baseline Neutrino Facility

KEY PLAN

KIRK RD

6-15-12_131.01.03.02.04.04.03.01_07_

I. HALIM

J. BUCHER

D. CREGGER

10/2023

10/2023

10/2023

LBNF NEAR SITE CONVENTIONAL FACILITIES

NEAR DETECTOR

SECONDARY EGRESS SHAFT SECTIONS

6-15-12

S-ND-205 01

/1

/2

S-ND-205

PROJECT NO.

PLAN

NORTH

S

W ESITE

N

FEETSCALE

1/8"=1'-0"

01 10/13/23 ISSUED FOR SOLICITATION4 05/20/2024

05/2024

05/2024

05/2024 0 /2

/2

SCALE: 1/4" = 1'-0"

SECTIONI

S-ND-202

(26) 14'-0" LONG ROCK BOLTS

EQ. SPC'D. @ 5'-0" ELEVATIONS,

STAGGERED

41'-0" [12.50m] EXCAVATED DIAMETER

3" FIBER REINFORCED

SHOTCRETE (TYP)

S-ND-207

SCALE: 1/4" = 1'-0"

SECTIONH

S-ND-203

FLANGE BOLT SETS OR

JACK AND WELD AS

REQUIRED

GRADE 50 STEEL RIB

SETS W14x109 @ 4'

ELEVATIONS

STEEL TIE RODS

STAGGER EACH SET

(TO BE DESIGNED BY

CONTRACTOR)

38'-0" [11.58m] INSIDE DIAMETER (CLEAR)

J

S-ND-206

WOOD LAGGING OR

STEEL LINER PLATES

CONCRETE COLLAR AND

FINAL SHAFT LINER BELOW

(SEE DETAIL 3 S-ND-207)

SCALE: 1/8" = 1'-0"

SECTIONJ

S-ND-206

41'-6" [12.65m] MIN. INSIDE RING DIAMETER

℄ PRIMARY SHAFT

WOOD SHIM

AS REQ'D.

TIE ROD

(STAGGERED) TIE ROD

4' -0

1.

m

(T

YP

GRADE 50 STEEL RIB

SETS W14x109 (TYP.)

CORRUGATED

LINER PLATE

S-ND-207

℄ PRIMARY SHAFT

TIE ROD

(STAGGERED)

TIE ROD

4' -0

1.

m

(T

YP

GRADE 50 STEEL RIB

SETS W14x109 (TYP.)

S-ND-207

3" MIN THICK WOOD

LAGGING (TO BE

DESIGNED BY

CONTRACTOR)

LINER PLATE ALTERNATIVETIMBER LAGGING ALTERNATIVE

41'-6" [12.65m] MIN. INSIDE RING DIAMETER

TO BE DESIGNED BY CONTRACTOR TO BE DESIGNED BY CONTRACTOR

FEETSCALE

12 2004 1/8"=1'-0"

6-15-12_131.01.03.02.04.04.03.01_07_

I. HALIM

J. D. McCoy

D. CREGGER

10/2023

10/2023

10/2023

LBNF NEAR SITE CONVENTIONAL FACILITIES

NEAR DETECTOR

PRIMARY SHAFT SECTIONS

S-ND-206 01

/1

/2

S-ND-206

PROJECT NO.SCALE:

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REVISIONS

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DRAWN

CHECKED

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ISSUED FOR SOLICITATION

303 East Wacker Drive Suite 1400 Chicago, IL 60601

312-373-7700 tel 312-373-6800 fax www.aecom.com

DRAWING NO.

Fermilab Long-Baseline Neutrino Facility

KEY PLAN

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S

W ESITE

N

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01 10/13/23 ISSUED FOR SOLICITATION4 05/20/2024

05/2024

05/2024

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ASB WBS DK WBS

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680 NEAR AH

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NDH WBS

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PRIMARY BEAM

ENCLOSURE (PBE)

PBE WBS

(BY OTHERS)

FEETSCALE

10050050 1" = 50'-0"

SCALE:

REV.

REVISIONS

DESIGNED

DRAWN

CHECKED

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REV. DATE DESCRIPTIONS

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303 East Wacker Drive Suite 1400 Chicago, IL 60601

312-373-7700 tel 312-373-6800 fax www.aecom.com

DRAWING NO.

Fermilab Long-Baseline Neutrino Facility

ISSUED FOR SOLICITATION

04 05/20/2024 ISSUED FOR SOLICITATION

PLAN VIEW & PROFILE HORIZONTAL SCALE (22x34)

PROFILE VERTICAL SCALE (22x34)

FEETSCALE

2001000100 1" = 100'-0"

SITE

N

TRUE

NORTH

S

W E

EXIS

T M

AIN

IN

JE

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IN

G

NEAR DETECTOR HALL

(UNDERGROUND)

(NDH)

NDH WBS

K

IR

K R

D

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DETECTOR

BEAMLINE

ABSORBER HALL

(UNDERGROUND)

(AH)

AH WBS

(BY OTHERS)

(LBNF 30)

ABSORBER SERVICE

BUILDING (ASB)

ASB WBS

(BY OTHERS)

DECAY REGION

(DK)

DK WBS

(BY OTHERS)

(LBNF 20)

TARGET COMPLEX

(TC)

(LBNF 5)

PRIMARY BEAM SERVICE

BUILDING (PBSB)

PBSB WBS

(BY OTHERS)

INDIAN CREEK

EXTRACTION ENCLOSURE

(EE)

EE WBS

(BY OTHERS)

EXIST MAIN

INJECTOR

PRIMARY BEAM

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PBE WBS

(LBNF 40)

NEAR DETECTOR SERVICE BUILDING

(NDSB)

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HALL (NDH)

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(BY OTHERS)

(LBNF 30)

ABSORBER SERVICE

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ASB WBS

(BY OTHERS)

MUON SHEILDING

(BY OTHERS)

SCALE: 1" = 100'

PLAN

SCALE: 1" = 100'

PROFILE

BEAMLINE

DECAY REGION (DK)

DK WBS

(BY OTHERS)

(LBNF 20)

TARGET COMPLEX

(TC)

TC WBS

(BY OTHERS)

(LBNF 5)

PRIMARY BEAM

SERVICE BUILDING

(PBSB)

PBSB WBS

(BY OTHERS)

EXTRACTION

ENCLOSURE (EE)

EE WBS

(BY OTHERS)

EXTRACTION

ENCLOSURE

EGRESS

(BY OTHERS)

SEE SHEET SW-101 FOR

STATIONING NOTES

(LBNF 40)

NEAR DETECTOR

SERVICE BUILDING (NDSB)

NDSB WBS

PRO-ECT NO.

SW-ND-300

LBNF NEAR SITE CONVENTIONAL FACILITIES

NEAR DETECTOR SITE DESIGN

EXCAVATION PLAN AND PROFILE

H. CHU

D. EGGERDING

F. LOUIS

05/2024

05/2024

05/2024

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EXISTING INDIAN

CREEK CULVERT

EXISTING INDIAN

CREEK CULVERT

SEE SW-136 FOR

TEMPORARY

CULVERT PIPING

REV. 0104