Questions_and_Answers_for_X-Ray_vault.docx

NND16586345Q

Questions and Answers

1. What X-ray Tube will be used in vault (so we can get dimensions of tube)

The Xray tube is a LPX160 Lorad 160kvp, liquid cooled.

2. Which wall will be the primary or will all walls need to be primary shielding?

All walls are primary walls.

3. Do you need a ceiling in the room?

Yes, a ceiling is required.

4. Do you need a floor or will you use the shop floor?

The shop floor will be used.

5. Do you require a Manual or Powered tube hoist?

Either would be acceptable.

6. How many Axis do you require? Up and Down only or do you require Left to Right as well?

X,Y, and Z Axis are required.

7. What Film Focal Distance do you require?

The minimum film focus distance is 60 inches from the source to the floor, if the source is contained in a hoist.

8. How heavy is the largest part?

Please refer to the LORAD 160 Owner’s manual for tube head specifications, found at this URL: www.spellmanhv.com/~/media/Files/Products/LPX160.ashx.

9. Do you want a pull open door or a manual sliding door with the powered as the option?

Either one is acceptable.

10. What size door do you require?

The door must be a minimum of 6.5 feet high and 3 feet wide.

11. Will you require a roll in threshold on door or a step in?

A roll threshold on the door is required.

12. How close will the 160KV x-ray tube be to the wall?

The tube may be placed anywhere within the vault. Please refer to 21 CFR 1020.4 for how emission limits are measured.

13. Are all surfaces considered primary shielding? –

All surfaces are primary shielding except for the floor.

14. Please advise x-ray tube type used for the optional small overhead hoist.

The Xray tube is a LPX160 Lorad 160. The CFR gives guidance on emission levels and where the source is to be placed during survey.

15. The SOW states that the vault should be "capable of containing a minimum of 160 kV. " Since we calculate shielding to the maximum, do you anticipate a higher kV as a possibility? If so, what will be the maximum?

160 kv, is the minimum, however, there is no maximum.

16. Will you require a leaded window for viewing? If so, what are the dimensions you will require?

A leaded window is not a requirement.

17. Can you provide the seismic requirements of the X-Ray Vault, taking into consideration that it will be located in California?

Seismic requirements can be found in ASCE-7-10, Chapter 13.

18. Warranty terms:

Warranty terms are proposed by the offeror. NASA does require at least 1 year on workmanship

19. Are layout drawings required?

Yes, layout drawings are required, and must not contain any vendor proprietary markings.

20. Will a mobile tube manipulator satisfy their requirements?

A mobile tube manipulator would not satisfy the Government’s minimum requirements; furthermore an overhead hoist desirable but not a requirement.

21. Do we provide a tube yoke? If so, what brand and model #?

No. A tube yoke is not required.

22. Do we provide the X-ray system? If so, what brand and model?

No. The Xray system will be provided by the Government. It is a LPX160 Lorad 160.

23. Cable penetrations – wall or roof? How many?

One wall penetration is required.

24. Where will the x-ray generators be located?

Xray generators may be positioned anywhere in the vault.

25. Do we supply a roof access ladder and handrail?

A roof access ladder and handrail is not required.

26. Pre-warn signal – do they want both audio and visual devices? What length of time do they want for the pre-warn signal.

The minimum pre-warn signal requirements can be found in 21 CFR 1020.4.

27. How many X-Ray On lights do they need?

The minimum number of X-ray On lights can be found in 21 CFR 1020.4.

28. What alarms do they want inside the vault?

The requirements for alarms can be found in 21 CFR 1020.4.

29. What is the maximum radiation leakage allowed?

The maximum radiation leakage requirements can be found in 21 CFR 1020.4.