P{sub 3} upscattering integrals for the effective temperature model for hydrogen

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Transactions of the American Nuclear Society

OSTI ID:678159

Zerkle, M L ^[1]

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1. Bettis Atomic Power Lab., West Mifflin, PA (United States)

Accurate representation of the epithermal flux rise in water-moderated lattices requires the treatment of thermalization effects above the thermal cutpoint (typically 0.625 eV). These thermalization effects may be accurately represented by treating hydrogen bound in water as a mass-one free gas at an effective temperature, T{sup *} = kT{sub e}, and treating upscattering as scattering without energy change. Typical values of T{sup *} are 0.120 eV for room temperature water and 0.129 eV for 300 C water. The author proposes an algorithm for accurately calculating the P{sub 3} moments of the upscattering integral.

• OSTI ID: 678159
• Report Number(s): CONF-990605-; ISSN 0003-018X; TRN: 99:009144
• Journal Information: Transactions of the American Nuclear Society, Vol. 80; Conference: 1999 annual meeting of the American Nuclear Society (ANS), Boston, MA (United States), 6-10 Jun 1999; Other Information: PBD: 1999
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
22 NUCLEAR REACTOR TECHNOLOGY
MODERATORS
THERMALIZATION
NEUTRON TRANSPORT
HYDROGEN
EPITHERMAL NEUTRONS
SCATTERING
ALGORITHMS
P3-APPROXIMATION
ANALYTICAL SOLUTION
REACTOR KINETICS