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AP1000 Under-Vessel Stair Lock

AP1000 Under-Vessel Stair Lock

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Application: Vogtle Units 3 & 4

The Under-Vessel Stair Lock is a Health Physics Engineered Barrier designed to secure and restrict access to the under-vessel area of the AP1000 reactor. This robust structure reinforces radiological boundaries and supports ALARA principles by physically deterring unauthorized entry into high-risk zones.

Key Features

  • Access Restriction: Prevents unauthorized or accidental access to the under-vessel area

  • Engineered Safety: Integrates into facility safety programs as a fixed, lockable barrier

  • Durable Construction: Fabricated from structural steel with a welded mesh panel

Installation Requirements

  • Mounting Method: Requires field welding for permanent installation of support brackets and frame

  • Compatibility: Custom-fitted for Vogtle Units 3 & 4 stairwell geometry

Specifications

  • Material: Steel frame with welded mesh

  • Mesh Size: 2" x 2" grid

This engineered barrier provides a high-reliability solution for reinforcing safety protocol in critical nuclear plant locations.

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