B513 Planning Meeting, 13^th September 2001

Present: Nigel Baddams, Tony Cass, Anne Funken, Jukka Lindroos, Dick Minchin, David Underhill, Mario Vergari, Tim Whibley

1. Previous Minutes & Matters Arising

• Apart from the obvious repetitions in Point 2, the Minutes were accepted. The various points were clarified as follows

• Cost for removal of old HVAC equipment. Ongoing; final quote expected by 21/09.

· Temporary airconditioning for UPS and batteries. The UPS has a dedicated air conditioning unit which can almost certainly be used for the battery room as well. One unit has to remain operational in S-406, but this will not present an obstacle to the civil engineering work.

· Cost for removal of old electrical distribution equipment. This has still to be finalised, but Anne gave an initial estimate of around 4KCHF for removal of the switchboard and the associated normabarres. However, Tony pointed out that there are many electrical cables running in cable trays to supply power sockets mounted on the pillars. These (and the old-style normabarres on the ceiling) should also be removed.

• Dave and Dick will review the cables and cable trays in the vault. As many of these as possible should be removed to increase the available clearance.
• A false floor void of at least 500mm is required for air conditioning ducts. Allowing for duct joints and clearance, we should assume that the false floor height (top of floor panels) will be 700mm above the existing floor level. It is not planned to remove the rails set into the existing floor.
• [Measurements by Dave after the meeting indicate that network cable trays descend 400mm from the ceiling which is 3500mm above the floor. On this basis, there would be a clearance of 2300mm above a 700mm false floor, at least across much of the vault area. As this is sufficient to house STK silos, a 700mm false floor is acceptable, but we should reduce this to 650mm, if at all possible.]
• In terms of fire rating and hot/cold smoke, Jukka stated that everything has to be dimensioned to resist for 2hours at 400°C. The initial cost estimates assume this level of fire rating.
• Fresh air preheating (in the event of fire) would be difficult to arrange, given the air volume and flow rate involved, and would cost some 15-20KCHF. Tony will discuss the need for preheating with people responsible for equipment.
• There was some discsussion as to whether or not a ramp would be needed to lead up to the false floor, as this would take up space. Overall, Tony felt that a ramp would be the simplest option for moving equipment in and out of the vault and that there was no great need for space in the S-212 corridor leading to the goods lift. On the other hand, no large equipment needs to be brought in through the door near the passenger lift, so steps should be provided there.
• The lighting arrangments in the vault are adequate in terms of light levels, but the equipment is old and no lighting is maintained in the event of a power cut. Anne will check to see if the whole system should be replaced or if it is sufficient to add extra lights connected to the UPS. (Rewiring the existing lights to connect some to the UPS was not felt to be a practical option.)

· Tony has still to organise discussions about the civil engineering work with Bernard Louchet and the contractor.

2. Long Term Arrangments for Electrical Supply to B513

• Nigel presented a very preliminary plan for housing the proposed substation in a “bunker” under the main carpark. All the equipment required in the initial plans would fit in a bunker some 8mx18m which would have a void of 70cm below a false floor level with the existing basement floor. Nigel estimated the cost for the construction of a completely bare bunker to be about 350KCHF.
• In the meantime, Anne has been refining the substation specifications. Anne proposed two options. The first would use four transformers to support a load of 2MVA (1.6MW) with full redundancy. The second option provides support for a load of up to 2MW, but requires five transformers and cannot provide full redundancy. Anne is investigating ways of reusing the two existing 2MVA transformers in either solution. Tony reiterated the need to support an active equipment load of 2MW.
• Anne and Nigel will further refine the plans for the future substation and its potential location before the next review in Mid-October.

3. AOB

• Anne will contact Mario Vergari to plan measurements of the inrush currents for a rack of PCs and to see if any information is available concerning the power supply harmonics for proprietary racked PC solutions.
• Next meeting at 2pm on Thursday 27^th September.