Consider a homogeneous, bare, spherical, source-free, critical, uranium-fueled reactor operating at a power Po. Explain how and why the power increases, decreases, or remains unchanged as a result of each of the separate changes to the reactor. a. The reactor is deformed into the shape of a football (ellipsoid).
b. A person stands next to the core.
c. The temperature of the core is raised.
d. A neutron source is brought close to the core.
e. An energetic electron beam impacts the core.
f. The reactor is run at high power for a long time.
g. The core is launched into outer space.
h. A sheet of cadmium is wrapped around the core.
i. The enrichment of the fuel is increased.

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c