Date: Tue, 18 Nov 2003 14:42:41 -0600
From: Kris Anderson 
To: Robert Plunkett , Gregory Bock ,
     Bruce Baller 
Cc: Richard Andrews , Dave Pushka ,
     James Kilmer , Gregory Lawrence 
Subject: Carrier Tunnel Magnet Installation

Gentlemen,
	In response to a request from NuMI management, Jim Kilmer, Dave
Pushka, and I witnessed the rigging procedure involved in moving
magnets from the pre-target beamline access hatch to the carrier tunnel
for installation on their respective stands.
	Our group met at MI-65 on 11/17 at 12:30 p.m. and accessed the
pre-target beamline tunnel.  Rigging the magnets up the incline
involves the use of a power winch and pulley system to pull a magnet
mounted to a frame structure consisting of rolling casters, provisions
for steering and course correction, and a brake/wheel chock.
	A detailed hazard analysis exists for this operation, as well as a
detailed written procedure for magnet rigging and installation.  Our
group witnessed moving a Q120 magnet up the incline in the pretarget
region.  The destination for this magnet is the Q114 location.  The
brake/wheel chock was tested on a very wet section of the floor with a
slope very near that of the carrier tunnel.  The stop proved effective
in controlling the load when tension was removed from the cables via
the power winch.  All hardware associated with the winch and cable
system appear to have very generous safety factors.  The task manager
and rigging crew was well aware of the safety issues and aspects of
rigging and controlling the load.  The responsible mechanical engineer
was on site to witness the operation and address any outstanding
concerns.
	It is our groups opinion (Anderson, Kilmer, Pushka) that the safety
and engineering aspects of rigging the magnets up the incline are well
understood and documented, and that appropriate hazard mitigations are
in place.
	The group does have the following comments and concerns regarding the
rigging operation:

1)  At the first cable guide stanchion just upstream of the ramp, the
cable passes over the tops of the anchor studs that hold the stanchion
to the floor.  Dave Pushka has conveyed this observation to Mayling
Wong and asked to have some nylon blocks added so that the cable rubs
against nylon.  The condition and integrity of the nylon blocks should
be periodically checked to insure they are effective in preventing the
cable from rubbing on steel and degrading the cable.
2)  Nylon should also be installed at the ramp transitions where the
cable is rubbing on the concrete.  Grooves have been worn into the
concrete from contact with the cable.  This can't be good for the cable.
3)  The group requests that Mayling calculate the anchor bolt load for
the stanchion just before the deadman - here the cable is about a foot
above the floor and makes a 30 degree bend, so the load on the
stanchion isn't zero.
4)  The group feels that it would be prudent to make sure the cable is
stowed at the end of a shift such that the cable sits out of water on
the floor.  The group recommends that the cable be protected from
sitting on a wet section of floor by any means they choose.

Please note that the focus of this access was on tugging the magnets to
the appropriate location and securing the load.  No aspects of actually
rigging the magnets on their respective stands were witnessed or
discussed.

Respectfully Submitted,
K.  Anderson
J.  Kilmer
D. Pushka