| 摘要 |
<p>A cylindrical electric penetration assembly carrying instrumentation leads from the interior of a nuclear reactor and having thin layers of polyethylene and lead radiation shielding installed at both its entrance and exit regions, the shielding layers being separated by a large hollow cavity located inside the central portion of the penetrator nozzle. Each layer attenuates and extinguishes either gamma ray or neutron radiation emanating from the reactor's core. The combination of the shielding and central air pocket prevents excessive radiation leakage through the penetration assembly and excessive heating inside the penetration nozzle.</p> |
