introduction

The national research and development program on nuclear reactors and nuclear fuel cycle technology requires numerous in-pile tests in HANARO. Extensive efforts have been made to establish design and manufacturing technology for irradiation facilities. Since HANARO is one of the world's most powerful multipurpose research reactors, this reactor provides a variety of irradiation tests that benefit from the exceptionally high neutron flux available. The HANARO irradiation facilities are classified into two categories: capsule and loop.

Capsule Irradiation Facility

Seven vertical holes of two different diameters are available for capsules in the HANARO core region for use in material and fuel testing. A non-instrumented capsule is typically 1m in length and 60mm in
..........diameter. Specimen temperatures are contro-
............lled by varying the widths of gas-filled
......gaps between the specimens and
................ specimen holders, and monitored with
.................... passive temperature monitors.

An instrumented capsule is of -
cylindrical shape and its mainbody
is 60mm in diameter and 880mm
in length.

The basic instruments of the capsules are thermocouples, fluence monitors,
and microheaters to fulfill user requirements.
The specimen target temperature is controlled by a capsule tempe-
rature control system for the reactor material irradiation tests.

The main activities of the capsule development and utilization programs are focused on in-reactor material tests, new and advanced fuel research and
development, safety-related research and development for nuclear reactor materials and components, and basic research.

Fuel Test Loop Facility

The Fuel Test Loop (FTL) to be installed in the core irradiation hole (IR) of HANARO, is a self-contained circuit that supports nuclear reactor fuel experiments. This FTL is composed of an in-pile section (IPS) and an out-pile system (OPS). The IPS includes inner and outer pressure tubes, flow tube, fuel and bundle head, closure head, and associated instruments. The OPS consists of a main cooling system, emergency cooling system, component cooling system, make-up and purification system, and associated instrumentation and controls.
The inner diameter of the in-pile test section is 100mm, in which a maximum of 24 PWR pins or one CANDU bundle can be loaded and tested under simulated power reactor conditions in the HANARO reactor. The main application fields of the HANARO FTL are fuel qualification fuel development.

....1. Cooling Tower	....5. Accumulator ........Volume 1.4m³
....2. Intermediate Heat Exchanger	....6. Main Pump ........Flow Rate 26.5 L/s
....3. Main Cooler ........Heat Transfer 1,259 kW	....7. Main Heater
....4.Pressurizer .......Volume 0.4m³.......Electric 100kW	....8. In-Pile Test Section ........Volume 0.012m³ ........800kW(CANDU 1Bundle) ........690kW (PWR 6X6 32 Pins)