KRAM, A lattice physics code for modeling the detailed depletion of gadolinia isotopes in BWR lattice designs

Conference · Mon Jan 01 00:00:00 EST 1990 · Transactions of the American Nuclear Society; (United States)

OSTI ID:6782617

Knott, D; Baratta, A ^[1]

---

1. Pennsylvania State Univ., University Park (United States)

Lattice physics codes are used to deplete the burnable isotopes present in each lattice design, calculate the buildup of fission products, and generate the few-group cross-section data needed by the various nodal simulator codes. Normally, the detailed depletion of gadolinia isotopes is performed outside the lattice physics code in a one-dimensional environment using an onion-skin model, such as the method used in MICBURN. Results from the onion-skin depletion, in the form of effective microscopic absorption cross sections for the gadolinia, are then used by the lattice physics code during the lattice-depletion analysis. The reactivity of the lattice at any point in the cycle depends to a great extent on the amount of gadolinia present. In an attempt to improve the modeling of gadolinia depletion from fresh boiling water reactor (BWR) fuel designs, the electric Power Research Institute (EPRI) lattice-physics code CPM-2 has been modified extensively. In this paper, the modified code KRAM is described, and results from various lattice-depletion analyses are discussed in comparison with results from standard CPM-2 and CASMO-2 analyses.

• OSTI ID: 6782617
• Report Number(s): CONF-901101-; CODEN: TANSAO
• Journal Information: Transactions of the American Nuclear Society; (United States), Vol. 62; Conference: American Nuclear Society (ANS) winter meeting, Washington, DC (United States), 11-16 Nov 1990; ISSN 0003-018X
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BWR TYPE REACTORS
REACTOR PHYSICS
GADOLINIUM OXIDES
BURNUP
K CODES
ACCURACY
C CODES
CROSS SECTIONS
FISSION PRODUCTS
FUEL PINS
GADOLINIUM ISOTOPES
NEUTRON FLUX
ONE-DIMENSIONAL CALCULATIONS
REACTIVITY
REACTOR CORES
REACTOR LATTICES
REACTOR OPERATION
TWO-DIMENSIONAL CALCULATIONS
VOID FRACTION
CHALCOGENIDES
COMPUTER CODES
ENRICHED URANIUM REACTORS
FUEL ELEMENTS
GADOLINIUM COMPOUNDS
ISOTOPES
MATERIALS
OPERATION
OXIDES
OXYGEN COMPOUNDS
PHYSICS
POWER REACTORS
RADIATION FLUX
RADIOACTIVE MATERIALS
RARE EARTH COMPOUNDS
RARE EARTH ISOTOPES
REACTOR COMPONENTS
REACTORS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210100* - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled