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######## Follow-Up Review

**of**

**NuMI Infrastructure Review**

**of**

**July 12 and 20, 2001**

Water Inflow -- HVAC -- Fire P&D -- Electrical Plan -- Enclosure Access
-- Radiation Safety -- Cooling Water Systems -- Vacuum -- Gas Systems --
Cable Tray -- Communications Ducts -- Controls -- FIRUS -- CATV -
Telephones

**A Brief Summary of Comments with Responses**

**by**

**Bob Ducar and Dave Pushka**

**March 6, 2002**

# Water Inflow

1.  Remember to put drip shields over Decay Pipe vacuum equipment in the
    Outfitting subcontract. (Hylen)

The vacuum pump skid, Decay Pipe cooling skid, and the Absorber RAW skid
will be built with roofs to protect equipment from dripping water.

2.  Be aware of potential need for drip ceilings in the Absorber area to
    protect equipment. (Childress)

This is similar to the previous comment from Jim Hylen. We are aware of
this potential need and protective measures will be taken as necessary.
The conditions in this area of the enclosure will be assessed during the
SB&O subcontract execution.

3.  Questioned if NuMI tunneling activity is contributing to a drop in
    the natural level of groundwater at Fermilab or having an effect on
    retention ponds. (Rucinski)

While it is true that the tunneling does de-water the rock in the
vicinity of the tunnel, the net impact on the natural level of
groundwater at the Fermilab site or any retention system is minimal or
non existent. Net inflow to the NuMI enclosure is presently estimated at
300 gpm. This inflow will be pumped out of the enclosure at the MINOS
shaft. Ponds are located adjacent to the MINOS service building to
capture the outflow. FESS has initiated a study to investigate routed
excess outflow to the Main Injector pond system.

4.  Is there a concern for a bad type of mold growing in the tunnels
    that could cause health problems? (Rucinski) A somewhat related
    comment concerned micro-organisms in the water inflow fouling
    drainage paths. (Plant)

Given the experience of Main Injector, this is an issue of concern as
related to both health problems and slip hazards. This issue has been
determined to be an **Action Item** and has been referred to the Project
Safety Coordinator for investigation and resolution. It should be
addressed by a qualified industrial hygienist. In addition to molds, the
potential of micro-organisms also should be investigated.
Micro-organisms in the Main Injector LCW piping system water led to
significant damage of metals.

5.  During construction activities, can sump pump failure cause flooding
    and drowning of workers? (Rucinski)

> Sump pump failures, either by the pumps themselves or by loss of
> electrical power, have caused flooding during the current Tunnels and
> Halls construction phase. However, these instances have never led to a
> credible danger of drowning due to moderate levels of inflow. The
> specific characteristics of the final sump pump system, that will be
> located at the MINOS access shaft, are still being designed by FESS
> Engineering. This final system will be installed under the SB&O
> subcontract. Review of the final design of the MINOS sump pump system
> has been identified as an **Action Item** and will be coordinated by
> the Project Engineers. A failure analysis of the system will be
> performed and/or reviewed at this future review. The analysis will
> also consider time necessary to recover from various postulated
> failures. The goal is to achieve a design with sufficient redundancy
> and alarms such that the level of the water never rises above the top
> of the sump pit or achieves any level sufficient to damage area
> equipment. Given the area at the most downstream end of the enclosure
> and the rate of inflow, drowning is not a credible hazard.

6.  At MINOS, consider a third high level pump. (Dan Johnson) Similar
    concern raised with a call for completely redundant system. (Plant)

The necessity of a third sump pump at MINOS has been accepted and is
being designed into the system. Rather than being a high level pump,
this third pump is thought to run near continuously at a flow rate
slightly less than expected inflow. This concept will significantly
reduce the cycling rate of the other two pumps with an expected increase
of longevity of the pumps and their associated electrical contactors.
Also see above comment and response.

7.  Doesn't think it is very well known how much water will be in the
    tunnels. This could effect the design of the enclosure and air
    system. (Capista)

It is agreed that there is some uncertainty in the expected water
inflow. Execution of the Tunnels and Halls subcontract includes grouting
in selected areas on a case by case basis to control inflow. This work
is in process. The basic designs of the enclosure and air system are
essentially fixed at this time and not subject to change. As the reality
of the enclosure becomes more clear, the sufficiency of the design will
be evaluated as to its adequacy. If the existing designs are thought to
be inadequate, changes will be made as necessary.

8.  Worried about drainage system plugging up with mud and silt over
    time. (Capista) Construction waste also noted as a potential problem
    for fouling pathways. (Plant)

It is agreed that this is a serious concern. Clauses in both the Tunnels
and Halls and SB&O subcontracts address the issue of keeping these paths
clean. Civil construction oversight is well aware of the potential
problem. The installation of technical and scientific components present
yet another opportunity for fouling of drainage paths. Necessary actions
to keep these paths clear will be specifically included in the execution
of installation activities.

9.  Suggested intermediate pumps pumping into a header. (Capista)

The present plan calls for all inflow to be pumped out at the MINOS
shaft. Earlier plans had a sump at Target with discharge at that shaft,
but this was eliminated as a cost saving measure. The prospect of
distributed sumps would require additional excavation under the Tunnels
and Halls subcontract with attendant high cost and schedule delay --
clearly not an attractive option at this point in time. While having a
single pump station at the MINOS shaft can be viewed as putting all
one's eggs in one basket, there are advantages to this approach. It
recognizes that most of the water inflow is downstream of the Target
shaft. The 2,200 foot long Decay Pipe passageway is basically a no mans
land. Location of any equipment in this passageway is highly discouraged
for a variety of reasons. With the sump at MINOS shaft, maintenance and
reliability issues are focused on this single location. Since the review
of last year, there has been much progress on the sump design with
special attention to reliability and redundancy.

10. Consider a second pumping station at Target Hall. Initial investment
    will be worth it in costs later. (Capista and Plant)

As previously stated, most of the water inflow is downstream of the
Target shaft and placement of a sump at Target was eliminated as a cost
saving measure. It is currently the consensus of the engineers in FESS
and the Project that a single pumping station, with adequate redundancy
for electrical power and pumps, will result in a system with very high
reliability. Additionally, the current design utilizes tandem
(two-stage) pumps with an attendant increase in efficiency.

11. Discharge at MINOS is one acre-foot per 40 hours. Does the Lab have
    a place or permit to dump that much water? (Plant)

Discharge water at MINOS is first pumped into a series of ponds adjacent
to the MINOS service building. The present plan is for excess water to
discharge into the Indian Creek waterway. Outflow will be tested for
compliance. It is anticipated that this discharge will meet IEPA
requirements. The new outflow will be included in the Laboratory's
existing permit with the State of Illinois. As previously mentioned,
FESS has initiated a study to investigate routed excess outflow to the
Main Injector pond system.

# HVAC

12. Recommendations for fans in the pump room. (Plant)

Ventilation fans already exist in MI-62. As plans are developed for the
new CMU wall enclosing the NuMI LCW pump system, we will make sure that
appropriate ventilation is provided for.

13. Target Hall needs a humidity spec to save the crane. (Hylen)

A specification does exist for the humidity in the underground spaces.
Equipment that is conservatively sized with respect to the anticipated
loads is included in the scope of the SB&O subcontract. Should the
actual loads exceed the expected, local heaters or dehumidifiers will be
added as determined to be necessary. Developed crane specifications are
thought to anticipate its installation in a less than ideal atmosphere.

14. Would it be prudent to have some permanently mounted air sampling
    monitors? (Rucinski)

Sharing your concern, Jack Steinhoff, the Fermilab Fire Chief, has
requested a topside readout of enclosure levels of O2/LEL/H2S/CO similar
to those produced by a TMX air sampling monitor. This issue has been
determined to be an **Action Item** and has been referred to the Project
Safety Coordinator for investigation and resolution. The Beams ES&H
Department has identified a sampling unit with remote readout that will
likely be suitable. Planned fire detection equipment includes smoke
detectors (in non-radiation areas) and VESDA type air sampling systems.
Underground areas are to be well ventilated. Natural potentials for ODH,
CO, H2S, and methane are very low to non-existent. The Safety
Coordinator should review the situation and develop recommendations. DOE
and Gage-Babcock may already have addressed these issues.

15. Strong concerns about humidity conditions in tunnel leading to
    vacuum, magnet and power supply failures. Reliability of the
    experiment will suffer. (Capista)

A specification does exist for the humidity in the underground spaces
that should result in a satisfactory environment for the installed
equipment. HVAC equipment, conservatively sized with respect to the
anticipated loads, is included in the scope of the SB&O subcontract. The
service building dehumidifiers are outfitted with chillers in their
final stages. It is planned to throttle back these chillers during the
installation phase so as to introduce more heated air into the
enclosure. If this strategy is insufficient, local heaters and/or
dehumidifiers will be added as necessary. Humidity sensitive technical
equipment, especially beamline magnets, will not be brought into the
enclosure until ambient conditions are suitable. In the overall, this is
a significant issue of concern for the Project.

16. Control condensation in the Carrier Tunnel to protect equipment. Use
    the Carrier Tunnel itself as an air duct. (Childress)

This idea has been considered and rejected even though there would have
been enhanced protection of equipment and mitigation of a confined space
hazard. However, with the new prospect of locating some quadrupole
magnets in the Carrier Tunnel, the issue has new life. Specifically,
there is presently a proposal to draw \~1,000 cfm of warm and relatively
dry air from the Main Injector through the Carrier Tunnel. This air
would exhaust into the Pre-Target enclosure and be quickly evacuated by
the exhaust fan at vent shaft EAV-1. The rate of exhaust would be
approximately doubled by increasing the capacity of the exhaust fan.

17. Do we have back up for tunnel heating when the air circulation
    system is down? (Childress)

There is no installed back-up for the air circulation system. The
thermal constant for the underground enclosure indicates that heating
would not be needed in the event of a modest downtime of the air
handling equipment. Temporary installation of 480 VAC fan heaters is a
relatively easy fix that could be employed to keep things warm if the
downtime is extensive.

18. With no humidity control in (the Decay Pipe) bypass tunnel, it could
    be very rough for equipment if installed. (Plant)

Agreed that this is a potential problem. However, no equipment is to be
installed in the Decay Pipe passageway other than a mid-point fire door
and a few electrical conduits. See related response for Carrier Tunnel.

19. Questions the validity of the 2% wall wetting number. If larger, the
    humidity removal system may not keep up. (Plant)

It is agreed that the 2% wall wetting figure is probably optimistic. It
is considered essential to keep ambient temperatures above the dew
point. Approaches to this problem are detailed in above responses.

# Fire Protection and Detection

20. Questioned lack of pumps for the fire protection system. (Rucinski)

Fire protection water comes from Casey's pond, consistent with all of
the other buildings in the vicinity of the NuMI buildings. There is no
requirement for local pumps.

21. Will radiation interfere with the smoke detectors? (Rucinski)

Radiation will indeed interfere with standard ionizing type detectors.
No smoke detectors of this type are planned for installation in
radiation areas. As an alternative, air sampling type systems (VESDA)
are planned for selected areas.

# Electrical Plan

22. Need more detailed planning of cables down shafts. (Childress)

Spreadsheets listing technical and infrastructure cables have been
prepared. These listings have now been included in the Service Building
and Outfitting drawings for installation during the related subcontract.
Generally, cables at Target will be in cable tray and cables at MINOS
will be in conduit. Intermediate tie points will be provided at the
MINOS shaft.

23. What precautions are taken to prevent shock hazards to personnel in
    the wet tunnel environment? (Rucinski)

120 VAC GFCI duplex outlets are to be installed throughout the
underground enclosure. Other necessary precautions will be addressed in
job specific hazard analyses as necessary and appropriate.

24. Concern about being in total darkness in the event of a power outage
    before the emergency generator kicks in. (Dan Johnson)

> Conventional power for emergency lighting is backed-up by emergency
> generators at Target and MINOS. Switchover to generator power is
> expected to be less than 15 seconds after the loss of conventional
> power. Battery back-ups for emergency lighting are currently not
> entertained in the design. This is to avoid performance of required
> monthly testing, as well as to avoid the generation of mixed waste for
> batteries in radiation areas. (Note, however, that the emergency
> generators will be tested monthly.) It is expected that the procedure
> for access to the underground enclosures may demand that each person
> carry a small flashlight. Additionally, training associated with
> access will inform trainees of the potential for brief times of total
> darkness in the event of a power failure.

25. Concern for installed equipment in the wet environment of the
    enclosures. Should consider minimal incandescent lighting. (Plant)

Agreed that a potentially wet environment will cause difficulties. The
degree of wetness is speculative at this point in time. Certain elements
of the electrical system have been specified to hold up to the
anticipated environment. Fluorescent light fixtures specified have
plastic cases with sealed lenses. Longevity of fluorescent tubes is
greater than that for incandescent bulbs operating at nominal voltage.
Additionally, the fluorescent tubes are more efficient in producing
minimum required illumination.

# Enclosure Access

26. Concerning access requirements, we need defined parameters to make
    decisions. (Dan Johnson)

This issue has been determined to be an **Action Item** and has been
referred to the Project Safety Coordinator for investigation and
resolution. A proposal for a Check-In Check-Out (CICO) procedure has
been developed with the input of safety individuals from BD, PPD and BD
Operations Department but has not yet received full buy-in by the
affected Divisions or the NuMI project management. The concept has also
been discussed with the Fermilab Fire Chief. Details of access and
emergency procedures and training need to be developed under the
oversight of the Project Safety Coordinator and NuMI Project management.

27. Should cameras be used to inspect some of the more remote areas like
    the Carrier Tunnel passageway? (Plant)

With anticipated improvements in lighting, ventilation and access,
personnel access to the whole of the Carrier Tunnel will be facilitated.
The Decay Pipe passageway remains as the singular most remote area of
the enclosure. Cameras might be considered for use there. However, it is
not at all clear if cameras could replace search and secure activities.

28. Gage-Babcock recommendations for occupancy limits should be followed
    at the onset of installation activities. (P. Martin)

It is agreed that this will be the plan. These limits apply at the MINOS
underground area that include the Absorber, muon alcoves and the near
detector hall. Occupancy will be limited to twenty-four.

29. The integrated installation schedule should be completed with
    estimates of manpower for each task so that the access issues can be
    understood. (P. Martin)

    Development of an integrated installation schedule is on the docket
    for the May 2002 DOE review. Installation of the near detector
    dominates activity at MINOS. Installation of the Absorber is the
    next most important activity. Both require intensive use of the
    access shaft. Other activities in this area are incidental in
    comparison. Organizers of all these activities are aware of the
    access limitations at MINOS. While there are no specific access
    limits at Target, there is some contention for the use of the Target
    access shaft. Work activity here is dominated by Target Hall
    installation activities. The other significant use of the access
    shaft will involve lowering of the beamline magnets. These are
    finite in number, however, so we do not anticipate any serious
    contentions here.

30. Method of recording entry and exit from the underground enclosure
    needs to be in place at beginning of installation activities and
    agreed upon by DOE, ES&H Section and the NuMI Project. (P. Martin)

It is agreed that recording of entry and exit (CICO) be in place at the
onset of installation activities. Reference above action item under Dan
Johnson's comment.

**Radiation Safety**

31. The 2^nd^ permanent stack monitor may be better placed at the
    Absorber vent rather than the primary beam carrier pipe vent.
    (Hylen)

Nancy Grossman, in consultation with the ES&H Section, has looked at
this and determined that the existing stack monitor location is
sufficient. A second monitor is not needed. During initial operation,
portable emission monitors will be used to measure the emissions and
additional permanent monitors will be added if found to be necessary.

32. Projections for tritium levels in horn RAW systems exceed Lab
    guidelines. Need plans for dealing with this for input to a
    formalized review. Important to preclude major surprises as we
    approach operation. (Childress)

Kamran Vaziri of the ES&H Section has calculated the activation of the
horn RAW system. Strategies for dealing with this have been developed in
conjunction with Don Cossairt. This issue was discussed at a RAW review
subsequent to this Infrastructure review.

33. Some power supplies are cooled by the RAW system. Would the room
    these supplies are in need to be interlocked? (Plant)

No power supplies are cooled with RAW. RAW skids are located in one of
the target support rooms and in the Absorber passageway near the
Absorber enclosure. It is anticipated that access to these areas will be
subject to special access requirements as determined by Beams ES&H.

# Cooling Water Systems

34. Provide access for cleaning of the shell and tube heat exchanger at
    MI-62. (Rucinski)

> The south end of the heat exchanger is positioned by an existing
> roll-up door. Cleaning is thereby easily facilitated. Additionally,
> the pond water strainer selected will afford easy manual flushing of
> the strainer to the rear of the service building without any
> additional fouling of the pond system.

35. Stated desire to interlock pond pump to LCW/RAW systems. Also asked
    for an "easy bypass" for maintenance and special running needs.
    (Plant)

The primary interface here will be between the pond pumps in PV-9 with
the NuMI beamline LCW system that will be located in MI-62 service
building. Controls will include local manual control for maintenance and
provisions, as necessary, for special running needs.

36. Stated impact of high pressure LCW on power supplies. Strongly urged
    not to add pumps to solve the problem. (Plant)

Dan Darimont of the EE Support Department was consulted to determine how
the proposed LCW pressure on the horn charging power supplies compares
with other installations. The maximum pressure listed for the PEI power
supplies is 250 psig. The supplies need a minimum 60 psig differential
to achieve sufficient water flow to cool the components. We intend to
run the LCW system here at 200 psig inlet and 80 psi differential. These
operating conditions are not outside of the listed conditions and are
consistent with other installations in service at the Laboratory.
Therefore, the existing design is adequate. Adding booster pumps is not
necessary.

37. Suggested a more complete review of the entire water system. (Plant)

The hydraulic calculations have been calculated independently, by both
Dave Pushka and Scott Reeves, and are in agreement. Once the proposed
beam optics changes are settled, the calculation will be repeated and
documented in an engineering note. (The new optics design is presently
thought to present a rather modest increase in net flow requirements.)
All of the LCW and RAW systems have been documented with schematic
diagrams and engineering calculations where the loads are known.
Instrumentation lists have been prepared for all water systems.
Additional review of these systems is not thought necessary given
established lines of communication between the Project and the Water
Group of the Beams Mechanical Support Department. If significant issues
arise, you will be informed.

**Vacuum**

38. NuMI vacuum should be compatible with that of the Main Injector.
    (Childress)

There is no doubt that the systems should be compatible. It is planned
to install sufficient pumps in the NuMI extraction line to allow it to
reach a pressure compatible with that of the Main Injector.
Additionally, good vacuum is needed for proper operation of certain
beamline instrumentation devices.

39. To save money, the stand-by Decay Pipe vacuum pump could be smaller
    in size. (Childress)

> All options to reduce cost of the Decay Pipe vacuum pumps will be
> considered. While there may be some advantage to reducing the size of
> the 2^nd^ pump, other accommodations for the differences are likely to
> more than balance the savings in capital costs.

40. General concerns about vacuum conditions by the Lambertsons.
    Suggests Terry Anderson talk to Mishra. (P. Martin)

Discussions have occurred and concerns are generally abated.

41. Unclear as to isolation of NuMI and MI vacuum. (Plant)

This issue has been addressed by Terry Anderson. Automatic vacuum
isolation valves have been (or will be) placed appropriately in the
beamline.

# Gas Systems

No significant comments.

# Cable Tray

No significant comments.

# Communication Ducts

No significant comments.

# Controls

No significant comments.

# FIRUS

No significant comments.

# CATV

42. Increase number of CATV lines going down shafts. (Childress)

Not much interest has been shown for increased CATV connectivity between
upstairs and downstairs. If there are significant numbers of enclosure
camera images that are required upstairs, the video signals would be
modulated onto a single CATV cable. The greatest use of cameras is
thought to be that for hot horn handling. These circuits will be local
and underground, not needing a connection to the service building.

# Telephones

No significant comments.