Amendment 04 QA 6-29-23.pdf

Amendment 04 to Solicitation# 1333ND23QNB680268 June 29, 2023

The purpose of this amendment is to provide a consolidated list of questions and answers:

1. In the Amendment 01 to Solicitation# 1333ND23QNB680268 released May 18, 2023, the response to Q3, A.3 was 5‐10 R/hr. Is R/hr correct or should it be mR/hr?

RESPONSE: R/hr is correct

2. When will the Metrology scan take place? The information from the scanning would be helpful for the proposal.

RESPONSE: It will not be done before the proposals are due. In accordance with the solicitation, assume the tank has enough clearance to come out.

3. For ALARA, can or will the reactor be de‐fueled for the duration of this project?

RESPONSE: Yes, the reactor will be de‐fueled for the duration of this project.

4. For ALARA, can a temporary shield be placed in the reactor to cover the thermal column tunnel?

RESPONSE: Yes

5. Please clarify the shielding analysis requirements. Are these two analyses sufficient?

a. Design a cask for the old TCT

RESPONSE: Yes

b. Design shielding for the tunnel and tooling to keep worker dose ALARA.

6. Can NIST provide an estimate of the activation/contamination of the old TCT? (Is this the 5 to 10

R/hr mentioned in Amendment 1?)

RESPONSE: Yes, the 5 to 10 R/hr applies to the tank.

7. What are the dose requirements for the storage container for the old TCT

RESPONSE: Less than 90 mR/hr at 1 foot.

8. Can NIST provide an estimate of the dose rate inside the TCT tunnel after the graphite and bismuth shielding are removed?

RESPONSE: 5 to 10 R/hr

9. Who is responsible for disposal of old TCT and Cask?

RESPONSE: NCNR is expecting to be the responsible party for the disposal. However, NIST will explore, as an Option, having the contractor be responsible. Please see revised Statement of

Work, Section VIII number 17 for details. Please quote for an onsite storage cask; option 1 DOT

Type A cask; option 2 shipment and disposal of old TCT in DOT Type A cask.

10. Paragraph 1.4 of the Conceptual Procedure to remove and replace NIST TCT states that there are two minor modifications needed to allow helium blanket gas to enter and leave the TCT while it is being operated. Who is responsible for this modification? If it is the contractor what are the details of the modification?

RESPONSE: Use existing pilot holes in new tank to drill and tap (1/8” NPT) 2 helium ports.

Fabricate 2 tubing assemblies for inlet and outlet helium connections. Install the helium connections once the tank is installed.

11. For the floor loading study, what is the removal path? Will the tank, clamshell, shielding assembly be moved outside of the Shield Door Track floor area onto other floor areas? Are the floors elevated or on grade?

RESPONSE: Everything will occur between the thermal column and the truck door. The floors are elevated.

12. Is a detailed drawing of the floor(s) available that shows type of material and reinforcement?

RESPONSE: Yes, drawings 3‐4, 7‐3‐1, 7‐3‐2 and 7‐3‐5

13. Will 84” clearance from edge of tank/clamshell/shielding assembly to outside face of shield & door need to be maintained to access to harness assembly?

RESPONSE: No

14. Need general arrangement drawings of C100 and C200 as well as design floor loadings.

RESPONSE: Requests for drawings or images must be sent by email to Nina Lin

(nina.lin@nist.gov) and Don Collie (donald.collie@nist.gov).

15. What is waste classification for DOT shipping?

RESPONSE: Please bid for onsite container and as an option DOT Type A container.

16. If existing TCT is stored on‐site what are general radiation shielding requirements or allowable dose rates?

RESPONSE: Less than 90 mR/hr at 1 foot.

17. Provide historical or estimated dose rates during stages of work (i.e., with concrete door in place, without door but graphite shielding, without graphite and steel shields

(top/bottom/sides), when only the tank is in present, and without tank when reactor liner is exposed).

RESPONSE: No dose with the door in place. 5 to 10 R/hr when graphite and shields are removed. Dose rate should be about same once tank is removed.

18. Provide historical activity analysis.

RESPONSE: Please see responses to questions 45, 46 and 47.

19. What is head height on 15T crane on C100 level?

RESPONSE: 14 feet

20. What are hook restrictions on 20T crane on C200 level? (i.e., movement restrictions and vertical hook height movement)

RESPONSE: It services the C200 level. Relative to C100, it can move within the 11 foot x 11 foot opening of the C200 floor hatch and can reach down to the B3 level (pool below C100 floor hatch).

21. Verify demineralized water availability in the work area? And flow?

RESPONSE: Demineralized water is available in C100. Flow rate is approximately 20 gpm.

22. Verify compressed air availability in work area? And pressure?

RESPONSE: Compressed air is available in the work area. Pressure is approximately 100 psi.

23. What will notification timeline be from NCR for when work is to start? How quickly will team need to train and mobilize to site?

RESPONSE: Within 30 days.

24. When will metrology scan be performed?

RESPONSE: TBD, tentatively mid 2024

25. Is it expected to replace TCT prior to it failing if there is an upcoming planned outage? What are scheduled upcoming planned outages and durations? Is there discussion of performing during a planned outage?

RESPONSE: Prefer to replace the TCT prior to it failing. Either at the end of 2024 or during a planned 2025 shutdown. No outages have been planned.

26. Will work be performed on a single 12‐hour shift or is expectation to work around clock, 7 days a week until job is complete?

RESPONSE: 12‐hour shifts (M‐F 7am to 7pm) until job is complete.

27. What are the modifications required to the new TCT? We understand installation of the (3) helium plugs but are there any other modifications we need to address.

RESPONSE: Use existing pilot holes to drill and tap (1/8” NPT) 2 helium ports. Fabricate 2 tubing assemblies for inlet and outlet helium connections. Install supplied skids and spacers. Weld helium test port plug closed and test (dye pen). Weld gasket to tank.

28. As a contingency, in the event the existing threaded holes cannot be used is it acceptable to over drill the holes in the vessel and install threaded inserts to allow for installation of the same size bolts?

29. Has previous analysis been performed to show that the mismatch of material does not have detrimental impact on the vessel, tank, or bolts.

RESPONSE: Only dissimilar metals are bolts (AL 7075) and steel frame.

30. Please provide detail for connection of helium plugs to TCT in (3) locations. Drawing shows a typical weld, but there is no detail for the weld. What material is the plug tubing made of?

RESPONSE: Old tank has welded helium connections. The new tank has threaded helium connections. Tubing material and fittings are aluminum.

31. Is contractor responsible for any pressure/leak testing following tank assembly installation?

RESPONSE: Helium connections must pass soap bubble test (Snoop).

32. Can NIST provide drawings for the new tank? It is understood that this is different from the original tank drawings.

RESPONSE: Requests for drawings or images must be sent by email to Nina Lin

(nina.lin@nist.gov) and Don Collie (donald.collie@nist.gov).

33. Can NIST provide structural drawings for the floor in the vicinity (C100 level)?

34. Can NIST provide the floor rating for C100 level?

35. Can NIST provide structural drawings for the plug over the pool at C100 level?

RESPONSE: It has the same capacity as the floor (1000 psf).

36. Can NIST provide drawings for the C200 level that locate the floor opening above?

37. Can NIST provide drawings for the 15‐ton polar crane above C100 level as well as the 20‐ton crane above the C200

38. Can NIST provide guidance in relation to possible optional DOT shipping container for removed tank assembly.

RESPONSE: Yes, Type A shipping container

39. Are the aluminum bolts for installing the tank assembly threaded into steel? If so, what coatings are required to prevent galvanic corrosion?

RESPONSE: Please propose a coating. Government suggests graphite‐based coatings (NEO

Lube).

40. Can NIST provide the structural drawings for the outside ramps.

41. Does the contractor have to qualify the outside load path for cask wheel loadings? (Perhaps we need to allow for steel plating?)

RESPONSE: Yes, this must be evaluated.

42. Please confirm the following work will be performed by NIST and not by contractor:

a. Removal of any liquid from the existing TCT

RESPONSE: Confirmed

b. Removal of the catwalk

c. Removal of the D2O inlet and outlet

d. Removal of the Boral Curtain Assembly

RESPONSE: Confirmed (note: hoist on C200 lifts curtain up.)

e. Removal of the Helium process piping and fittings in the upper corners of the TCT

43. Will any final acceptance testing be required to be performed by the contractor after completion of installation of the new TCT?

RESPONSE: Helium connections must pass soap bubble test (Snoop). Tank must hold and not leak water.

44. Is the movement of the TCT around the building and into storage the responsibility of the contractor? If so, is the contractor responsible for providing all material handling equipment such as forklifts and flatbed? Are there any combustible loading limitations for equipment inside the building?

RESPONSE: NCNR staff will provide and operate forklifts and flatbed truck. Contactor must place old tank in shielded container within reach of the C200 crane.

45. Can NIST provide an activation and contamination analysis for the existing TCT?

RESPONSE: When it was opened in 09/2001 up to 10,000 dpm/100 cm^2 was seen.

46. Please provide any survey records that reflect the expected radiological conditions to be encountered at the TCT face.

RESPONSE: Measurements in 09/2001 showed a dose rate at the face of the tank at 7 R/hr at 6” and 2 R/hr at 1 meter from tank. The highest dose rate that was noted was inside a pipe bend at 15 R/hr. This location is a tight tolerance and only a hand or foot could fit into the area to see that dose rate.

47. The presence of both cesium and cobalt was mentioned during the walkdown. The presence of cobalt from activation is understood; however, the presence of cesium implies contamination from primary coolant (spills?), which could be indicative of potentially significant contamination to be managed. Please describe the characterization of removable contamination to be expected.

RESPONSE: In 1998 large area smears were performed and analyzed. The nuclides observed on the gamma spec were Cr‐51, Co‐60, Fe‐59, Zn‐65. Due to potential cross contamination from graphite shielding there is a potential for Eu‐152, Eu‐154, and Sc‐46. These nuclides were also observed in 2001, and 2002.

48. Is the provision of shielding for storage (or shipment if option is selected) part of the contractor’s scope?

49. Please confirm that the only modification required to be performed to the new TCT by the contractor is the drilling and threading of the Helium loop fitting threaded holes. Does NIST know the size and type of thread?

RESPONSE: Use existing pilot holes to drill and tap (1/8” NPT) 2 helium ports. Fabricate 2 tubing assemblies for inlet and outlet helium connections. Install supplied skids and spacers. Weld helium test port plug closed and test (dye pen). Weld gasket to tank.

50. Does NIST have a torque specification for the TCT bolts?

RESPONSE: No

51. Is the contractor responsible for providing temporary shielding during removal and installation?

RESPONSE: The Government has some shielding available (i.e., shield walls and rolling wall) but shielding to be used with extraction and installation tooling is the contractor’s responsibility.

52. Will the contractor be responsible for all contamination control equipment needed during installation or will this already be installed by NIST for performance of the graphite block removal?

RESPONSE: Government will use a HEPA filter to put a negative pressure on the cavity while removing components in front of the tank. This will be available to the contractor.

53. What is the anticipated PPE required during removal and installation?

RESPONSE: Tyvek suit, gloves, booties, and cap/hood. Will be provided by NCNR Health Physics group.

54. Please describe the needed training, including durations, for the contractor work force.

RESPONSE: Submit paperwork for NIST badge and complete HP training (1 day). Included in this

Amendment 04 is the General Data Sheet for NIST Contractors form to be used for badge submittal.

55. Please describe the security clearance / background check requirements for the contractor work force.

RESPONSE: Submit paperwork for NIST badge. Included in this Amendment 04 is the General

Data Sheet for NIST Contractors form to be used for badge submittal.

56. Does NIST have a site‐specific rigging plan? Will NIST provide the riggers or are they to be provided by the contractor? Do contractor provided riggers need to be qualified to the NIST program?

RESPONSE: Contractor provides riggers. Reactor Operators will operate the overhead cranes.