Addendum 1 to CSER 78-001 PWR Core 2 Blanket Fuel Storage Cell 4 221T building

Technical Report · Fri Dec 03 04:00:00 EST 1999

DOI:https://doi.org/10.2172/798822· OSTI ID:798822

GOLDBERG, H J ^[1]

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1. FDNW

Irradiated pressurized water reactor (PWR) Core 2 (PWR-2) blanket fuel assemblies from the Shippingport PWR have been stored in the 221-T canyon water pool for twenty years. The fuel is in the form of small wafers of UO{sub 2}, which were initially natural enriched uranium (0.72% {sup 235}U). The uranium oxide wafers have a pyrolytic carbon coating, which prevents the fuel from reacting with a zircaloy-4 grid which provides structural strength and holds the wafers in place to form fuel plates. Thirty fuel plates comprise a sub-assembly which are held together by zircaloy-4 end plates. Two identical oxide fuel plate sub-assemblies are welded together to form a square structure with two zircaloy-4 extensions welded to the ends. Seventy-two PWR-2 assemblies are stored in the 221-T canyon water pool. Eight of these assemblies were irradiated in the center of the reactor core to an average burnup of 24,538 Mwd/MTU. The remaining assemblies had a burnup of 16,200 Mwd/MTU. These assemblies were placed in the canyon in 1978 and 1979 (WHC 1996). The original Criticality Safety Analysis Report (CSAR) (WHC 1990) analyzed the criticality safety of their storage and concluded that they were safe from a criticality standpoint. It was also mentioned in this CSAR that the assemblies were scheduled to be stored for twenty years. The Criticality Prevention Specification (CPS) for this storage configuration (RHO 1978), included in (WHC 1990), specifies that the fuel ''will be stored in Cell 4 up to 20 years'', and that ''no special handling or storage requirements for criticality control during interim storage up to 20 years'' were necessary. The purpose of this addendum is to extend the period of coverage for this material. The analysis examines zircaloy-clad fuel degradation and extends the permitted storage time by ten years for Shippingport Core 2 blanket fuel assemblies in the 221-T, Cell 4 storage pool.

• Research Organization: FDNW (US)
• Sponsoring Organization: ENVIRONMENTAL MANAGEMENT (US)
• DOE Contract Number: AC06-96RL13200
• OSTI ID: 798822
• Report Number(s): HNF-4922, Rev.0
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
ENRICHED URANIUM
FUEL ASSEMBLIES
FUEL PLATES
PWR TYPE REACTORS
PYROLYTIC CARBON
REACTOR CORES
SAFETY ANALYSIS
STORAGE
URANIUM OXIDES
ZIRCALOY 4