Fort_Randall_480_Volt_Switchgear_Breakers_Bidder_Questions_POST_MEETING_REVISED2.pdf

Fort Randall 480 Volt Station Service Breakers 06 Sept. 2017

Q1: Are any of the breakers remotely operated?

A1: Yes, Breakers 12, 22, and 24 on the Main Station Service bus and Breaker 42 on Misc. 20 Switchgear.

The remaining breakers are manually operated. This will be revised by a forthcoming amendment.

Q2. Can the existing kirk key interlocks be reused?

A2: No. Provide new kirk‐key interlocks on retrofitted equipment and also provide new interlocks keyed to match existing equipment that are not being replaced in this contract. This will be revised by a forthcoming amendment.

Q3. Which breakers are electrically interlocked?

A3: Breakers 12, 22, and 24 on the Main Station Service bus are electrically interlocked. This will be revised by a forthcoming amendment.

Q4. What are the cable lengths for the 13.8kV cables being replaced?

A4: See cable and conduit schedules in reference drawings. Drawing number MR‐OPN‐83C5354, cable number TKT3 for Transformer 2 feeder. Drawing number MR‐OPN‐83C5158, cable number 3FKT1 for Transformer 4 feeder.

Q5. Are disconnects 075 and 077 which are connected to transformer 4 enclosure being replaced or are they to remain?

A5: Yes, these disconnects are bold on drawings ED601, ED602, E‐601, and E‐602 for replacement. A specification for these disconnect switches will be provided in a forthcoming amendment.

Q6: Can the existing transformer enclosures be re‐used and only replace transformer windings?

A6: No. Provide new enclosure according to Section 26 12 16.01 26, para. 2.4.5.

Q7: Verify number of total breakers to be supplied, including spares (Section 01 22 00.00 26 paragraph

1.3.2 states a total of 95 breakers, the table in Section 26 23 10.10 26 paragraph 2.2.4.1 states 99 plus 6 spare). Does the table include the 10 breakers listed in Optional Item 0012 (6 spillway and 4 intake breakers)?

A7: Section 01 22 00.00 26 para. 1.3.‐‐95. Section 01 22 00.00 26 para. 1.3.1‐‐10. TOTAL = 105.

Yes, Table includes all breakers (Basic and Option). Section 26 23 10.10 26 paragraph 2.2.4.1‐‐99 plus 6 spare. TOTAL = 105.

Q8: Verify number of electrically operated breakers, the table in the spec states all 600A breakers are manually operated, we found many feeder breakers were EO.

A8: Breakers 12, 22, and 24 on the Main Station Service bus and Breaker 42 on Misc. 20 Switchgear are electrically operated. The remaining breakers are manually operated. This will be revised by a forthcoming amendment.

Q9: Review required interlocking. Spec states electrically interlocked breakers with bus tie scheme, however there were also mechanical key interlocks for generator operation.

A9: Existing mechanical plunger type key interlocking is as follows:

Misc. 20 switchgear:

1) Breaker 42 incoming feeder in bucket #8 is key interlocked with incoming emergency feeder in bucket #2

2) Breaker 42 has an additional key interlock used to operate disconnect 65, 67, 75, and 77.

Lighting:

1) Incoming feeders in bucket # 6 and 9 have mechanical key interlock.

MSS bus A:

1) Breaker 12 and 24 keys interlocked with Emergency Generator Breaker in bucket #26. These same two keys are associated with the Emergency Tie Switch (keys C & D)

Common Aux Swgr:

1) Incoming feeders key interlocked bucket #12 & 15

2) Misc. 20 Emergency feeder key interlocked to Emergency Tie Switch (key A)

This will be revised by a forthcoming amendment.

Q10: Control Panel 460VAC SWGR Misc. Power had a ground detector switch and Minute Meters for the Unwatering Pumps. Do we replace the switch and meters only? Does operation remain the same?

A10: Drawings E‐210, E‐211, and E‐212 show which equipment is to be replaced. Unwatering pump hour meters and switches do not need replaced. Operation remains the same.

Q11: Spec Section 2.2.4.1, General: All feeder breakers are listed as electrically operated on the OEM drawings provided. The spec states that all 600A breakers are to be manually operated. Please confirm this is correct.

A11: Breakers 12, 22, and 24 on the Main Station Service bus and Breaker 42 on Misc. 20 Switchgear are electrically operated. The remaining breakers are manually operated. This will be revised by a forthcoming amendment.

Q12: Spec section 2.2.4.3.C Feeder Air Circuit Breakers: Spec states all feeders are to have a shunt trip.

Please confirm this is a requirement.

A12: No, the only shut trip required is on Crane Breaker. This will be revised by a forthcoming amendment.

Q13: Spec Section 2.2.4.2 Bus Supply and Bus Tie Circuit Breakers: Please confirm that transfer of main and tie breakers is accomplished through electrical interlocks and hard wired relays, and that no PLC scheme is required. Are specific details available on existing schemes?

A13: 460V STATION SERVICE CONTROL‐460V BUS TIE ACB CONTROL diagram is on Am#0001, Sheet E‐

206. No PLC is required.

Q14: Would you please provide a proposed outage and completion schedule?

A14: Breakers are all rackable and do not require an outage for replacement. The bracing study will require outages, but only one switchgear bus at a time will be allowed an outage. The Contractor will be required to submit a proposed work plan and outage schedule for approval by the Government. This will be revised by a forthcoming amendment.

Q15: Please provide what type of replacement metering device or devices required. Is multifunction digital relay acceptable?

A15: Voltmeters, Ammeters, and Watt‐meters are specified in Section 26 00 00.00 26, paragraph 2.8.

Multifunction digital meters are acceptable.

Q16: Section 26 08 01.00 26, Part 3.4 requires the contractor to participate in all Government commissioning and testing activities by “reviewing and becoming familiar with the Government commission plan, and by participating in the commissioning process”. The section then goes on to require that the contractor provide multiple craftsmen in addition to the Commissioning engineer. How many craftsmen are required to take measurement per the Government’s commissioning plan? Is the plan available for contractor inspection in order to estimate required man hour requirements for the craftsmen and the Commissioning Engineer?

A16: This reference section describes the necessary support that the contractor will need to provide in support of the governments commissioning activates. The contractor is to provide at least one qualified individual and as many qualified individuals needed in order to support all aspects and type of equipment being commissioned. It is dependent on the qualifications of the governments personal as to who all is needed and a maximum number is not specified but may vary from contractor to contractor depending on their qualified craftsmen.

Q17: Section 02 83 00, Part 1.7 requires the Contractor’s competent person to “certify that the LBP control area and the area external to this area has met final clearance requirements”. Is the “competent person” as defined by OSHA’s 1926.62(b) or is an IH required since a requirement to “certify” is included? A competent person is not normally required to “certify” “final clearance requirements”.

A17: With regards to specification 02 83 00 part 1.7 the competent person must meet the requirements of OSHA.

Q18: A “commissioning engineer” is cited is part 3.4. The specifications don’t have any personnel requirements for a commissioning engineer other than those listed under part 1.6.1 of “five years construction experience” and regular involvement in commissioning of electrical equipment. Are there additional requirements for the commissioning engineer or is this individual anticipated to be the “field engineering service personnel”?

A18: Specification 26 08 01.00 26 part 1.6 defines the requirements and the responsibilities for the contractors commissioning representative. These are the requirements that must be met.

Q19: Section 02 83 00, Part 1.7 requires the Contractor’s competent person to “certify that the LBP control area and the area external to this area has met final clearance requirements”. Is the “competent person” as defined by OSHA’s 1926.62(b) or is an IH required since a requirement to “certify” is included? A competent person is not normally required to “certify” “final clearance requirements”.

A19: With regards to specification 02 83 00 part 1.7 the competent person must meet the requirements of OSHA.

Q20: Are there specifications for the relays that are to be replaced in the Switchgear? (Drwgs E‐200 to E‐212) A20: No, Contractor’s standard relays for switchboard applications which meet the requirements of the existing relays (voltages, contact ratings, function…etc.) being replaced will be acceptable. We do not have any manufacturer “or approved equal” (Example: Schweitzer relays) requirements either.

Q21: For the 480VAC Intake Structure Switchgear, Note 1 lists terminal blocks being replaced but none are shown on drawings or a quantity given of how many to be replaced. Please advise. (Drwgs E‐208 to E‐209) A21: Note 2 on the drawings, sheets E‐207, E‐208, E‐209 will be revised by amendment (TERMINAL BLOCK will be changed to FUSES).

Q22: For the 480VAC Intake Structure Switchgear, Note 1 does not list fuses as being replaced but they are shown on the Switchgear Bill of Material as being replaced. Please advise. (Drwgs E‐208) A22: Note 2 on the drawings, sheets E‐207, E‐208, E‐209 will be revised by amendment (TERMINAL BLOCK will be changed to FUSES).

Q23: The 480VAC feeder cable from Transformer 4 to 480VAC Miscellaneous Power Switchgear 20 is shown as bolded on the drawings. Is it to be replaced under this contract? (Drwgs ED602 & E‐602) A23: No, this is existing bus work which is to be retained. Drawing sheets ED602 & E‐602 will be reissued by amendment.

Q24: The specifications states that all 480VAC feeder cables in the Switchgear are to be tested and will be replaced if necessary. Are we to include pricing for the replacement of the 480VAC feeder cables or is that to be covered under a contract modification?

A24: No, replacement of these cables is not in contract. This contract requires testing only of these cables.

Q25: In the spec it states to supply a 200kW generator to power critical loads. How many critical loads do we need to power and how many points do we have to connect the gen. cables to? We are trying to figure out how much labor to put on this item.

A25: See SECTION 26 00 00.00 26, paragraph 3.12 TEMPORARY POWER for a list of the loads that require temporary power.

Q26: The least expensive way to complete this work is to perform all the work in one continuous outage. I know you had stated you would leave it up to the winning bidder to propose outages.

Basically have one mobilization. I didn’t want to quote in multiple mobilizations assuming our competition would only quote one. Is this realistic? I do not want to quote the USAC this job and then give you a bunch of mobilization adders at the end. I would rather quote what we think the actual mobilization will be.

A26: See SECTION 01 22 00, paragraph 1.3.1. Payment under CLIN 0001 will be for one mobilization/demobilization. Any additional movements are considered incidental. Only one bus may be taken out at a time, but these bus outages may be taken consecutively.

NOTE: 26 00 00.00 26, paragraph 2.7 Indicating Lamp Assemblies: Changed 125 to 140V DC.