Questions Before the Civil Conceptional Design

Changgen YangDaya Bay Collaboration

Meeting2006/06/09

About conceptional design

• First try to collect all the specifications contributed from all collaborators, then discuss them, write in version of English and Chinese.

• Start the civil conceptional design, communicate with designer, have their design, then we discuss again in collaboration to clearify what we want, discuss with designer again and finish the civil conceptional design.

• Start the civil construction design. (Changes still easy even after the conceptional design finish, but better before constructional design).

1. Slope and transportation tools of the entrance tunnel from portal to Daya Near site.

2. The cross section of the tunnel

3. The layout of the experimental halls

4. Assistant facilities (LS mixing, filling, assembly rooms……)

5. General utilities of the laboratory (HVAC, safety, drainage……)

6. What else?

Questions List Instead of Answers

1. Slope and transportation tools of the entrance tunnel from portal to Daya Near

Site.• The length of the tunnel is about 290 m. With

different slopes(8%, 10%, 12%), it will affect the depth of the near sites overburden very much. 10m of depth decrease the number of cosmic muons ~22%(@90m rock);

• What is the constraint for the slope? (This is essentially a private use tunnel, not a public transportation road, we have not seen limit constraint by rules)

1). Weight(<20 T SS tank, bridges of crane)? 2). Transportation tools?• What is the transportation tools? Truck in the entrance tunnel? truck/roller in the main tunnel?

2. The cross section of the tunnel

• Trucking (40cm above ground)?• Hilman roller (saving tunnel cost, need to reduce

vibration during transportation)?• Put these as two options for the conceptional design.

7.2 m

• Zero emission vehicles available• Low-speed towing• Forward and reverse towing• Vehicle ballasted• OK for incline (<8%)

Water Pool

50-ton crane

Electronic Hut Electronic Hut

Cart for moving detector module

pure water

ports for calibration

frame also serves as cable trays

Conceptual design of a underground water pool-based experimental hall

Container-based

Or …

3. The layout of the experimental halls

We will have two options for theconceptional design, one with just an empty hall, one with waterpool. Make decision before preliminary design.

a) Use crane or other lifting system?b) How to deploy the central detector modules?c) The top muon tracker: slidable/moveable?d) Water purification system?e) Calibration?f) Magnetic composition coils?g) What else?

or directly move away by crane?

3. The layout of the experimental halls (cont’)

3. The layout of the experimental halls (cont’)

• The orientation of the experiment halls:

Daya near site or? Daya near site

• Simulations show it doesn’t matter, then which one is more preferable? Or rather consider the tunnel mechanics and construction?

4. Assistant facilities (LS mixing, filling, assembly rooms……)

a) The storage of the liquid materials?

b) Where to mix LS? To fill? Fill 1 or 8 each time?

c) Where to do the assembly of central detector modules?

d) Utilities for these rooms;

e) Control room;

f) Ground laboratory.

1) Occupancy (Typical numbers): a) Detector Assembly: 25 persons/12 hrs/day for 6 months (37.5 FTE/Day) b) Detector Shakedown: 3 persons/8 hrs/ 3 shifts for 6 months (9FTE/Day) c) Detector Operation: 2 persons/8Hrs twice weekly ( 0.4 FTE/Day) d) Detector Maintenance: 10 persons/12 hrs, 2 days every 6 months. (0.3 FTE/Day)2) Tunnel Floor 30 cm thick steel reinforced concrete with two, flat, 3 cm thick by 30 cm wide flat rail

for detectors. Integrated floor drain (see below)3) Air Exchange a) Norminal: One air exchange in experimental galleries every ~1 hr. Duct transfers

outside air from tunnel portal through duct to the experimental galleries where it is in turn exhausted through the tunnel back to the tunnel portal. This reduces radon exposure from tunnel walls in experimental galleries. In the case of Diablo Canyon, this requirement translated to 0.56 m diameter duct in tunnel to supply air to (two) galleries, together totaling 9000m^3 volume. Duct diameter scales as

(total experimental gallery volume) ^0.25. Need 6 volume per hour of air to flush out radon in the experimental hall if central detector modules are exposed to the air? If RPC is used, need to take care of

the flammable gas. b) Requirements for tunnel are met by return air from experimental areas.

5. General utilities of the laboratory (HVAC, safety, drainage……)

4) HVAC a) tunnel, negligible b) Experimental Galleries

– Temperature 62 deg F +/- 1 deg F– Rel Humidity 50% +/- 1%– Heat Load: 25 KW– Max concentration of Radon: 50 Bq/m^3– Clean Room standard: Class 100,000, FED STD 209E Classification

5) Standard Electrical Power a) Tunnel:

– Quad 120V, 20 amp outlet every 25 meters in tunnel – 250V 3 phase 30 amp outlet, every 100 m.

b) Detector rooms– Quad, 120V, 20 amp outlet every 3 meter of wall or raised walkway– 250 V, 3 phase, 30 amp every 10 meter of wall or raised walkway5)

6) Underground Experimental power a) 25 KW, 400 Hz? Per detector. (Requires 400Hz motor generators for clean

experimental power)7) Standard Lighting a) Tunnel: One fixture at center of ceiling in tunnel. Repeat as necessary to get 10 ft

candle/meter^2 in at floor of tunnel everywhere. b) Experimental Hall: 100 ft candle/m^2 on floors and raised walkways

8) Standard Phone a) phone handset, line “A” every 100m in tunnel. b) Phone handset, line “B” every 100 m in tunnel, offset 50 m from phone “A “ c) Two additional outside phone lines for each experimental gallery (i.e. 6-8 total in

galleries + 2 in tunnels = 8-10 lines total).9) Internet connections: a) Dual 1 Gigabit fiber-optic connections from each experimental gallery to office at or near

tunnel portal (6-8 fiber optic lines total for 3-4 galleries)10) Drainage a) Equivalent of 15 cm diameter pipe with continuous floor grate, one side of tunnel.

Ultimate diameter depend on ground water conditions from survey. 11) Tunnel Emergency lighting a) One powered lighting fixture with battery backup to supply light each 50 m over

telephone handsets “A” and “B” above. b) Experimental gallieris: Five powered lighting fixture with battery backup to supply light

each side of galley, 10 total per gallery, 30-40 overall total for 3 or 4 experimental galleries.

12) Fire Detection a) One heat detection head every 25 m of tunnel. b) Fire alarm and flashing light every 100 m of tunnel. c) VESDA system (Very Early Smoke Detection Alarm) Experimental equipment, costed

as part of detector, one per experimental gallery, 3-4 total)

13) Fire Suppression (Experimental Equipment), a) Dry pipe system. Pressurized with water on detection of fire. b) “Halon” self contained fire suppression in experimental racks.14) Water pool water supply, drainage, contamination monitor, temperature

sameness for far and near sites because of the overburden/temperature differences ……

6. What else?

Need to fill as much completely as possible

Kam-Biu and I will collect the specification of tunnel/hall from all collaborators, then discuss by collaboration and merge them together, we would hope to have it soon, so the conceptional design could start early.

Now (Conceptional)

Construction bid

Construction design

1-2 year

Shaded boxs:To be approved by bureaus

Other documents

Commencement

• The civil design can not start until we

(firmly) answer these questions;

• More complete we foresee the potential

problems, less money we spend;

• Don’t miss requirements, potential

problems;

• Early Integration -> will result in fewer

changes and major time/cost savings later

(C. Laughton).