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Summary of the change request from KEK

Summary of the change request from KEK.

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Summary of the change request from KEK

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  1. Summary of the change request from KEK KEK suggested 4 changes to be made on the AFC. We have looked into the request carefully and discussed the implications of making this changes. 3 of the 4 requests are technically acceptable, but with a cost and schedule implication. The other request is technically not feasible to implement and require a decision from the Technical Board. The following slides highlight the change requests.

  2. Change request No. 1

  3. Safety Window flange ring Change requested That the nip of the flange ring for the Safety Window be shortened. Currently this nip is 30mm long for welding to the warm bore tube – long thin nip reduces thermal stresses. Tesla needs to trim it down to 10mm in order to provide sufficient clearance between it and the Absorber support stud rods. Original design has the individual G10 spacers bolted on either side of the absorber – no need for a long protrusion by the one piece long stud bolt Cost:- Tesla to review and advise Schedule:- Will impact on schedule as 6 drawings are needed to be revised Technical issue – none, but KEK may want to reduce the stud bolt head to avoid any changes on the Tesla supply.

  4. Action:- WL to write to Tesla requesting this change after receiving approval from Ken / Andy.

  5. Change request No. 2 That a ring flange of 267.5 outer radius with 48 M6 tapped holes be welded to the Thermal Radiation Shield. This ring is used to secure the LH2 pipes from the absorber, and to anchor the Absorber via the stud bolts (see next slide)

  6. Change implication for request No. 2 Previous design anchors the LH2 pipe work to the Thermal Radiation Shield. This in turn anchors the Absorber into position. 4 blocks with tapped holes are welded onto the thermal shield to provide the fixing. Cost implication:- Tesla to advise; Schedule:- Yes, as they need to revise drawings, make the ring with 48 M6 tapped holes; Technical issue:- None, just extra work. However, there are lots of redundant tapped holes which may never be used.

  7. Action:- WL to write to Tesla requesting this change. Again formal approval from Ken / Andy is needed before writing to Tesla.

  8. Change request No. 3 That the lower part of the local thinning on the Large End Plate be widened to allow sufficient clearance for the 30 pin feed through Tee off. This request has been made to Tesla. It was agreed that the local thinning area remains the same, but the Large End Plate will be rotated by 2.5 degree anti-clockwise to make more room for the T-off piece. This requires the bolt hole pattern be slightly re-orientated. No cost and schedule implication from Tesla.

  9. Action:-  Shigeru is confirm acceptance by the end of next week (we need to notify Tesla soon).

  10. Change Request No. 4 That the spill bucket be modified to make room for the 30 pin feed through. Technical issue:- This is not possible as there is no room to do that, as seen in the diagram on the right. KEK to examine if the Feed through piece could be bent and modified to suit existing space. Technical Board to decide if this request should be rejected.

  11. This requires KEK to bend the instrument cable pipe to suit the existing space envelop. Shigeru to examine cost and schedule implication.

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