Abstract
n examination of failed fuel in TMI after cycle 10 identified that fuel with cladding wall damage was associated with a distinctive crud pattern (DCP). The TMI fuel was inspected and all degraded fuel rods removed. TMI is a Band W designed PWR (2568 MWt) using a 15 x 15 array fuel assembly. Observation showed that the DCP only occurred on high powered peripheral rods in first burn fuel assemblies. The length of the cycle 10 core (665 EFPD) represented a 'high energy' core. Cycle 10 experienced axial power distribution anomalies in one core quadrant similar to the AOA observed in other plants, but of lesser magnitude. During follow up investigations, DCP was observed at a second plant of this type although there was no fuel degradation. TMI cycle 11 was redesigned to reduce BOC boron and a new set of primary system chemistry controls were implemented to prevent DCP. These actions were successful as TMI cycle 11, which was longer in length than cycle 10, operated without DCP, fuel failures, or any power anomalies. (authors)
Mitchell, D;
[1]
Thomazet, J
[2]
- Framatome Cogema Fuels, Las Vegas, NV (United States)
- FRAMATOME, 92 - Paris-La-Defence (France)
Citation Formats
Mitchell, D, and Thomazet, J.
Crud deposition and fuel failures.
France: N. p.,
1998.
Web.
Mitchell, D, & Thomazet, J.
Crud deposition and fuel failures.
France.
Mitchell, D, and Thomazet, J.
1998.
"Crud deposition and fuel failures."
France.
@misc{etde_20048593,
title = {Crud deposition and fuel failures}
author = {Mitchell, D, and Thomazet, J}
abstractNote = {n examination of failed fuel in TMI after cycle 10 identified that fuel with cladding wall damage was associated with a distinctive crud pattern (DCP). The TMI fuel was inspected and all degraded fuel rods removed. TMI is a Band W designed PWR (2568 MWt) using a 15 x 15 array fuel assembly. Observation showed that the DCP only occurred on high powered peripheral rods in first burn fuel assemblies. The length of the cycle 10 core (665 EFPD) represented a 'high energy' core. Cycle 10 experienced axial power distribution anomalies in one core quadrant similar to the AOA observed in other plants, but of lesser magnitude. During follow up investigations, DCP was observed at a second plant of this type although there was no fuel degradation. TMI cycle 11 was redesigned to reduce BOC boron and a new set of primary system chemistry controls were implemented to prevent DCP. These actions were successful as TMI cycle 11, which was longer in length than cycle 10, operated without DCP, fuel failures, or any power anomalies. (authors)}
place = {France}
year = {1998}
month = {Jul}
}
title = {Crud deposition and fuel failures}
author = {Mitchell, D, and Thomazet, J}
abstractNote = {n examination of failed fuel in TMI after cycle 10 identified that fuel with cladding wall damage was associated with a distinctive crud pattern (DCP). The TMI fuel was inspected and all degraded fuel rods removed. TMI is a Band W designed PWR (2568 MWt) using a 15 x 15 array fuel assembly. Observation showed that the DCP only occurred on high powered peripheral rods in first burn fuel assemblies. The length of the cycle 10 core (665 EFPD) represented a 'high energy' core. Cycle 10 experienced axial power distribution anomalies in one core quadrant similar to the AOA observed in other plants, but of lesser magnitude. During follow up investigations, DCP was observed at a second plant of this type although there was no fuel degradation. TMI cycle 11 was redesigned to reduce BOC boron and a new set of primary system chemistry controls were implemented to prevent DCP. These actions were successful as TMI cycle 11, which was longer in length than cycle 10, operated without DCP, fuel failures, or any power anomalies. (authors)}
place = {France}
year = {1998}
month = {Jul}
}