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| Entered date | Site | Region | Reactor type | Event description | |
|---|---|---|---|---|---|
| ENS 44124 | 7 April 2008 18:41:00 | Rancho Seco | NRC Region 4 | B&W-L-LP | Rancho Seco is a defueled reactor. All fuel is in the Rancho Seco ISFSI. During decommissioning operations in the reactor building, a debris fire occurred while the contractor was cutting rebar during the removal of interior concrete. Assorted trash and combustible materials were ignited. The building was evacuated per procedures and onsite SMUD staff and contractors brought the fire under control utilizing available fire suppression equipment after several minutes and the fire was deemed extinguished at 1340 hours, 4/5/08. No injuries occurred. All weekend work operations were ceased and a fire watch was established. A review of the incident occurred and measures to prevent future fires were employed. Decommissioning work resumed Monday, 4/7/08. As part of the After Action Review it was determined official notification to response and regulatory agencies still needed to be made. No detectable airborne contamination occurred. No contaminated personnel occurred. The fire was detected in destruction debris under a pile of concrete rubble in the reactor building. The fire was initially extinguished at 1045 PDT by onsite personnel. The fire reflashed two additional times and was extinguished until it was determined to by completely extinguished at 1340 PDT on 04/05/08 and the licensee terminated the Unusual Event. The event was declared and logged by the ISFSI Technician on 04/05/08, who is also the onsite Emergency Coordinator when an emergency is declared. It was discovered on the morning of 04/07/08 that the emergency declaration was made and logged on 04/05/08 at 1140 PDT, but no offsite regulatory notifications had been made. The licensee notified the local NRC Inspector (Garcia) and Region 4 (Keller). The licensee will be notifying the state and local emergency response organizations. |
| ENS 42968 | 6 November 2006 17:20:00 | Rancho Seco | NRC Region 4 | B&W-L-LP | This event is a 24 hour notification per Technical Specification 2.2.1. Based upon the differences in the definition of damaged fuel presented in RSAP-0112, and the commitments made in various licensing documents, it was determined that a potential existed that damaged assemblies may have been placed in a fuel canister licensed only for intact assemblies. A potential problem exists with fuel assemblies, which had been categorized as class "C" assemblies in the RSAP-0112 inspection results, and therefore would not have had any restrictions on the type of canister to be placed. Class "C" assemblies were those assemblies not meeting the requirements of F2 for gross cladding defects, did not have cracks which exceeded dimensional of approx. 0.34 inches across and 0.7 inches high. Based on further review of the RSAP-0112 inspection results, six fuel assemblies were upgraded as potentially damaged fuel assemblies because the written inspection reports indicated the existence of a crack or missing cladding greater than the class "C" limit. With the exception of assembly 2G6, the video portion of the tape is not 100% conclusive that a crack greater than a hairline exists on the other five fuel assemblies. Based upon the images available of assembly 2G6, the crack on this assembly was scaled to be approx. 0.04 inches wide by 0.25 inches long. The film quality of the remaining 5 assemblies is not sufficient to provide such detailed scaling but is estimated for discussion purposes. NRC Project Manager (Randy Hall) was notified of this by the licensee. |