[2] This value varies with experimental environment of core. Table II. Typical APRFR Performance Levels PULSE MODE Routine Yield 1.5 × 10¹⁷ fissions/pulse Reactivity Insertion $1.10 Pulse Half-Width 48 μsec Initial Prompt Period 18 μsec Maximum Fuel Temperature Rise 400°C Temperature Coefficient -0.3 cents/°C Maximum Available Yield ~2.1 × 10¹⁷ fissions/pulse STEADY STATE MODE Continuous Operation ~1 kw Intermittent Operation ~10 kw Steady state power levels are limited by effectiveness of core cooling system and core activation. [Illustration] [Illustration: APRF Floor Plan] Exposure Locations and Performance Levels The highest fluence and dose rates are available in the 1½-inch glory hole. Since the reactor is supported from above by the transporter, the areas around and below the core are also available for experiments. The core can be positioned by remote control anywhere within the range of travel of the transporter. Vertical travel is limited to about 44 feet above the Reactor Building floor level. Horizontal travel is limited by the range of the rails on which the transporter travels. Six pairs of rails extend radially from a turntable in the center of the Reactor Building. These rails terminate within the Reactor Building, except for one pair which extends 90 feet outside the building to an outdoor test site. Each pair of rails defines one experimental location where semi-permanent equipment and shielding can be set up without tying up the entire reactor operation. Fluence and flux data for three typical exposure locations are given in Table III. In the absence of reflecting material beyond 1 meter from core center (position P3), these values fall off essentially as 1 —— R² where R is the distance to core center. Other performance data are summarized in Tables IV through VIII. [Illustration] [Illustration] [Illustration] [Illustration] Table III. APRFR Fluence and Flux Data ------------------------------------------------------------------- Routine Pulse Yield Maximum Pulse Yield 1.5 × 10¹⁷ Fissions 2.1 × 10¹⁷ Fissions ------------------------------------------------------------------- Fluence, n/cm² P1[3] 6.7 × 10¹⁴ 9.3 × 10¹⁴ P2 2.0 × 10¹⁴ 2.8 × 10¹⁴ P3 1.7 × 10¹² 2.4 × 10¹² Flux Density, n/cm²/sec P1 1.4 × 10¹⁹ 2.0 × 10¹⁹ P2 4.3 × 10¹⁸ 6.0 × 10¹⁸ P3 3.7 × 10¹⁶ 5.2 × 10¹⁶