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Unformatted text preview: 2 ) with the fast flux cutoff specified by E > 1 MeV; and -the constants are C 1 = 0.013 and C 2 = 0.0018. b) Notation and Support Information : For points originally on the axial centerline (x = 0; y = 0 ), denote displacements in the x-direction, the y-direction, and the z-direction displacement, respectively, by u, v, and w. 1 At z = 0, the follower is supported so that u, v, and w are all zero and so that no moments are applied. At z = L, the follower is supported so that the z-direction force is zero, so that u and v are zero, and so that no moments are applied. c) Fast Neutron Fluence: After several refueling cycles, a follower has an accumulated fast fluence given by: N = [ x x ][ N z ] ; N ( ) ( ) (1.2) z Where N is the fast fluence expressed in the units of Eq 1.1; where 0.1 x N x = W ; and where (1.3) ( ) 15 1 + x ( z -( L 2 )) N z = . (1.4) ( ) 1.49cos p z L e L e is the extrapolated length of the core ( 2.54 m ) d) Questions : d.1) What is u as a function of z ? d.2) What is the value of w at z = L ? 2...
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- Fall '06
- Neutron, Neutron moderator, BWR, zircaloy follower, fast fluence