Questions and Anwsers..pdf

Questions and Answers

#1 - On the First Article testing, could you clarify what actually you will require. First Article Testing can mean different things to different people.

First article testing is not required.

#2 - 3.2.1.5 Contractor shall provide a conceptual rendering, sketch, drawing, and/or photo of the design concept with the bid submittal.

One of the attached questions refers to extend bid for (5) working days. Next week is a holiday week, so we will lose 2-3 days. I have to wait on response to questions. I also have to get pricing on some items from outside vendors, which also have to deal with holidays and because you will require drawing to be submitted with the proposal, this is reason I ask for an extension.

An extension of the bid due date may be needed to provide the required detail on the conceptual design is it possible to extend the bid an additional (5) working days?

Yes, extension is authorized. 6 December 2019, no later than 2:00 pm PST.

#3 - 3.2.2.1 The casks shall be designed and fabricated for use as a Type A Package per 49 CFR.

Is a filtered vent required for this design; if not is a filtered vent acceptable for this design?

Filtered ventilation is not acceptable for this design. The internal demineralizer will be mechanically captivated and will not vent into the cask during shipment. A filtered vent would only add unwanted complexity and maintenance.

#4 - 3.2.2.2 Contractor shall submit proof of cask compliance with 49 CFR Part 173.412 for certification as a Type A package. Physical testing would be costly and impractical for this type of container design, is a comparative analysis showing compliance acceptable?

Comparative analysis is acceptable provided it complies with 49 CFR Part 173.415(a)(1)(ii) and

173.461(a).

#5 - 3.2.2.4 The intended shipping contents of the cask will be a nine (9) cubic feet cylindrical pressure vessel

It is assumed that the vessel will be depressurized at the time of loading, is this correct? Will there be any residual liquid in the vessel, if so how much? It is assumed that this container does not need to meet the requirements for a liquid container is this corrects? Will there be any nozzles or protrusions on the vessel to be considered in the design?

Yes, vessel is depressurized and mechanically captivated; only residual pressure difference would come from temperature variation after initial packaging. Maximum expected residual liquid in the inner demineralizer is two gallons. The cask is not required to meet liquid container requirements as all liquid will be contained to the inner demineralizer. There are three 1” quick disconnects (nozzles) on the top of the demineralizer: 1EA Hansen part # ML8-HP36-SL and 2

EA Hansen part # ML-KP36. The internal clear opening height of the cask WITH LID

INSTALLED must be 47” +3” / -0” to support the demineralizer with caps/plugs installed on the nozzles which will be approximately 46” tall.

Questions and Answers

#6 - 3.2.4.1 The walls, bottom, and lid of the cask when assembled in the shipping configuration shall provide gamma radiation attenuation equivalent to four inches of solid lead sheet for a Co60 source.

Is a stepped lid design required, or preferred?

The requirement of the specification is to obtain the stated gamma radiation attenuation with the proposed contents. In order to prevent radiation streamers, a stepped lid or similar method is required to shield the gap caused by the gasket. A stepped lid is preferred.

#7 - 3.2.7.2 The cask lid shall contain two permanent (not bolted on) lifting padeyes.

The lid may not lift and hang level with two lifting attachments, are three attachments acceptable?

Three lifting attachments on the lids would be acceptable provided that they don’t interfere with the lifting of the cask (i.e. cause an interference)

#8 - 3.2.7.5 The padeye base material shall meet the material requirements of ANSI N14.6-1993. This requires a drop weight test per ASTM E208 or a Charpy impact test per ASTM A370-77 of the base material as specified in paragraph 4.2.6 of ANSI N14.6-1993. The anticipated minimum service temperature for the cask is 20 deg. F, therefore, the nil ductility transition temperature shall be a minimum of -20 deg F. Contractor shall submit certified documentation of satisfactory results for all padeye base material.

Is ASTM HY80 material acceptable?

If HY80 is sourced per T9074-BD-GIB 010/0300 there are too many variations as to what type of test could be used to determine brittle nature of material to meet our requirement. Therefore, it cannot be guaranteed that the specific material will meet the Charpy impact testing requirements of N14.6. Whatever material is chosen must comply with N14.6. ABS Grade

EH36 (Yield=51K, Ultimate= 71k) comes with Charpy Impact Test Results that meet that N14.6 standard.

#9 - 4.1.1 All welding of this specification shall be performed to AWS D1.1 (or AWS D1.6 if stainless steel is used) by AWS qualified welders.

Is ASME Section IX qualification acceptable?

AWS D1.1, paragraph C-4.2.2.1 allows for other welding standards with similar qualification tests to be authorized by the Engineer depending on the application. The cognizant engineering organization at PSNS&IMF has determined that ANSI/ASME Boiler and Pressure Vessel Code, 1989 Section IX is an acceptable alternative standard/qualification and may be used in lieu of

AWS D1.1 where referenced by the specification.