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June 13, 2001

To: Distribution

From: Bob Ducar

Re: Access to NuMI Underground Enclosures

The subject of access to NuMI underground enclosures and how to control
access has been batted around in various discussions with more questions
raised than solutions offered. There are no simple solutions given the
variety of areas to be accessed and the vastly different conditions from
now to eventual operation of the beamline and experiment data taking.
But access control is just one aspect of the solution to a bigger
problem. I have had some discussions with Howard Casebolt and Dave
Pushka on the matter. From these informal discussions, I offer here a
possible context for discussion -- surely not a final answer but rather
a common (?) point from which to start.

The following is an exhaustive (?) list of the various areas to be
accessed. Also specified are those areas that are thought to be surely
classified as confined spaces.

NuMI Stub and Extention

Carrier Pipe (Confined Space)

Pre-Target Area

Bottom of Target Shaft

Target Hall

Underground Power Supply Room

RAW Pump Room

Decay Pipe (Confined Space?)

Decay Pipe Passageway

Absorber

Muon Alcoves

Passage Upstream of MINOS Shaft to Absorber and Muon Alcove Areas

Bottom of MINOS Shaft

MINOS Experimental Hall and Staging Area

And another exhaustive (?) list of fundamentally different working
conditions as work activities progress is provided here. These are
sequential in nature and are referred to as stages.

Stage 1: Tunnels and Halls Civil Construction

Stage 2: Enclosure Outfitting and Service Building Construction

Stage 3: Technical Equipment Installation

Stage 4: Commissioning of Technical Equipment

Stage 5: Operations

A clear focus of the discussion is provision for personnel safety.
Hazards will need to be specifically discussed for each of the areas and
for each stage of work activity. Means of mitigation will include
engineered solutions, training, and access control.

We think there is easy consensus that special training will be required
for access. The training should be presented well, to the point, brief,
and documented. Training content is expected to change as the different
stages of work activity are completed. For discussion, the below is a
starter list of items to be covered in a training session.

Flammable Material Control

Road Map of Area, ID Named Areas, Identify Sloped Areas

Emergency Egress

Self Rescuers (Not thought necessary for all stages)

Constraints on Work Activities

Identify Confined Spaces and Related Access Requirements

Unique Hazards

What Happens During a Power Outage (i.e. Generator Start-Up Delay)

We have batted around some ideas for access control and propose the
following for initial consideration. First of all, the individual must
be trained. When trained, the individual picks up a unique key and
unique picture ID. (Howard has talked to KEY & ID Office folks and they
can do this.) Go to either the Target or MINOS Service Building and open
a locked cabinet with the unique key. Remove an entry medallion and
leave your unique ID. Close and lock the cabinet and enter. If there are
no available medallions, you don't go down. All personnel in the
enclosure must have a medallion in their physical possession. Keys
change when training change. The cabinet has a see through front face.
Changed conditions would be posted by the cabinet.

Distribution:

> Bob Mau
>
> Dan Johnson
>
> John Anderson
>
> Martha Heflin
>
> Mike Andrews
>
> Howard Casebolt
>
> Raymond Lewis
>
> Dave Pushka
>
> Aesook Byon-Wagner

Bruce Baller