Y--P-310 Dry Dock 1 Super Flood Basin and P-1074 Extend Portal Crane at Portsmouth Naval Shipyard in Kittery, ME

These projects propose various upgrades to Dry Dock #1, and Berths 1, 2, and 11 at the Portsmouth Naval Shipyard (PNS) as part of the shipyard’s effort to meet mission requirements and return vessels to the naval fleet. The proposed upgrades are divided into two separate projects that will be awarded together: P-310 and P-1074. The P310 upgrades include the construction of a super flood basin at the entrance to Dry Dock #1. This project includes: constructing a basin closure wall with entrance structure and caisson seat and repurposing the existing Dry Dock #3 caisson gate; extending the “Flatiron Pier” (Berths 1 and 2) to the new closure wall; increasing the height of the basin wall at Berth 1; installing metal sheeting in front of Berth 1 to prevent water exfiltration; dredging the area in front of Berth 1; and installing water-tight enclosures around each of the service galleries inside Dry Dock #1. In addition, new portal crane rail will be installed along Berths 1, the basin closure wall, and the western portion of berth 2. Fender panels will be added to Berth 2. Project P-1074 involves upgrades to the portal crane rail and the addition of train rail, as well as upgrades to existing utilities. Specifically, this project includes: providing a high capacity crane rail/test area for heavy lift access along the south side of the Reactor Servicing Complex (this will require grade changes, a retaining wall, and site layout adjustments); extension of portal crane rail to the eastern portion of berth 2; increasing the load capacity of the existing portal crane rail foundations at Dry Dock #1 and the turnout to Berth 11; adding a new train rail spur from Berth 1 to the planned Refueling Complex; providing a new access tunnel under the existing crane rail foundations between Dry Dock #1 and the Reactor Servicing Complex; providing various electrical upgrades, such as crane heater circuits, industrial power, and area lighting; adding a substation, transformer, and secondary substation in the Berth 2 shore power substation, as well as necessary electrical distribution feeds; providing a communication system conduits between the planned Refueling Complex and Dry Dock #1; and providing pure water piping from the planned Refueling Complex to the planned pure water pad.

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Waterway and Marine Construction, Common Work Results for Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Marine Construction and Equipment.