October 23, 2001

Coordination Meeting - Electrical Power Systems (WBS 4)

A coordination meeting was held on October 23 with Raki Ramakrishnan, Bob Simmons, and Wayne Reiersen.  Three topics were discussed:

WBS
Scope of work for CDR
Work plans and resource requirements

Reiersen provided a revised WBS Dictionary.  The elements remained the same.  The descriptions were modified slightly.  The revised WBS also reflects the new guidance that everything required through the Initial Ohmic Phase of operations (Phase 3) should be part of the construction project.  The revised WBS for Electrical Power Systems is posted here.

The work plan for WBS 3 leading up to the CDR consists of the following steps:

  1. Define the Construction Project and upgrade requirements for WBS 4.  This includes defining current waveform and voltage requirements for each circuit.
Main coil systems [Due by 11/21, Action: Reiersen]
Trim coil systems [Due by 12/21, Action: Reiersen]
  1. Update the Conceptual Design of Electrical Power Systems to be consistent with changes in the stellarator core incorporated since the PVR. [Due by 2/15, Action: Ramakrishnan]
Prepare description of initial and ultimate (all upgrades incorporated) configurations for coil power systems
Identify interfaces with other systems, making sure everything is accounted for (but not designed) and all parties understand where the interface is.
Identify floor space requirements, making sure that area preparations are covered under WBS 61 (or wherever is appropriate).
  1. Develop cost and schedule inputs for Bob Simmons. [Due by 3/1, Action: Ramakrishnan]
  2. Develop system description for inclusion in CDR documentation. [Due by 3/15, Action: Ramakrishnan]
  3. Prepare presentation for CDR. [Due by 3/29, Action: Ramakrishnan]

Raki Ramakrishnan presented a work plan through the CDR.  The plan featured tasks that would substantially reduce key uncertainties present in the cost estimate prepared for the CDR.  Unfortunately, the resource requirements for executing the work plan were 3X the initial resource allocation (30 person-weeks v. 10 person-weeks).  Ramakrishnan agreed to rework the plan to reflect a reduced scope of simply updating the PVR design and cost estimate to be consistent with changes in the design of the stellarator core incorporated since the PVR.  A follow-up meeting is planned for 11/2.

One issue that came up at the WBS 3 Coordination Meeting had to do with who was responsible for the field cabling between Diagnostics Systems (WBS 3) and Central I&C (WBS 5).  Johnson advocated making Ramakrishnan (Power Systems, WBS 4) responsible for the work because that was who did that work on NSTX.  Upon discussing this with Ramakrishnan, it was determined that he would be responsible for this task.  A new WBS element would be created within Diagnostics Systems (WBS3).  Ramakrishnan would develop the description of of that WBS element.