ICEM11 Final Program 9.7.11pm_ICEM07 Final Program ... - Events

Abstracts Session 32
7) FREE-RELEASE AND SORTING MONITORS DEVELOPED FOR NPP A-1
DECOMMISSIONING, SLOVAKIA (wP-59071)
Ondrej Slávik, VUJE; Alojz Slaninka, VUJE, a.s./ Slovak University of Technology in Bratislava;
Martin Liatjak, Kamil Kravárik, VUJE, a.s.; Igor Pély, JAVYS, a.s. (Slovakia)
Bohunice NPP A-1, Slovakia, was a pilot NPP shut down after nuclear accident with loss of fuel integrity in 1977. Presently,
the 2nd stage of decommissioning project implementation is carrying out. Within this stage of decommissioning it is necessary to
decontaminate, monitor and if possible to free release large amounts of contaminated materials. From point of view of the material
volume to be monitored, contaminated soil and concrete debris are the most crucial ones in this stage (thousands of tons). They
were until now temporary stored in underground basins or similar places within the NPP controlled area. Within the mentioned project
a pilot free-release and sorting monitoring post were developed in order to support the extended need to mentioned monitoring
capabilities.
The main goal expecting to the sorting monitor is to reduce the volume of contaminated materials to be monitored for freerelease.
An operative monitor was designed for this purpose that is based on quick and direct in situ measurements of loader spoon
filled with the excavated materials. A pair of NaI(Tl) detectors is used for the measurements. The spoon is fixed on a covered measurement
frame with automatic fixation logic (pair of rails and an inductive sensor on the…
8) DESIGN AND OPERATION OF THE COMBINED TECHNOLOGY AUTOMATED
WASTE CHARACTERISATION SYSTEM (wP- 59308)
John Mason, Marc R Looman, Robert A. Price, A. N. Technology Ltd. (UK)
This paper describes the design and operation of the Combined Technology Automated Waste Characterisation System (CTA-
WCS) at JRC Ispra. The WCS was designed for the measurement of fission products and uranium and plutonium containing waste
arising from nuclear fuel and nuclear materials processing and reactor operations. The WCS covers a range of activity including
Low and Intermediate Level Waste (LLW and ILW). The system is designed to measure the waste in 200 and 400 (440) litre drums
with a maximum drum weight of 1500 kg. Gamma-ray measurements of radio-nuclide content are performed by a gamma ray measurement
station which functions as either a Segmented Gamma Scanner (SGS) or Tomographic Segmented Gamma-ray Scanner
(TSGS). Either of these two techniques may be employed to perform the functions of drum screening, non-destructive examination
(NDE) and, where appropriate, final drum assay. Coupled to the gamma ray station is a surface dose-rate measurement station,
which employs 6-shielded Geiger-Muller detectors. Active and passive neutron measurements are performed by an advanced,
graphite lined Differential Die-away (DDA) system, which comprises the neutron measurement station. The DDA performs conventional
passive neutron totals, coincidence, and multiplicity counting and active DDA total neutron counting. Data analysis is
based on the use…
SESSION 32 — REPOSITORY PROGRAMS: SITE SELECTION & CHARACTERIZATION,
UNDERGROUND RESEARCH LABS, ENGINEERING & GEOLOGICAL BARRIERS - PART 1 OF 2 (2.3)
1) SAFETY ASSESSMENT INPUT TO SITE SELECTION - THE SWEDISH EXAMPLE (wP-59031)
Johan Andersson, JA Streamflow AB (Sweden)
Svensk Kärnbränslehantering AB (SKB) has performed comprehensive investigations of two candidate sites for a final repository
for Swedens spent nuclear fuel; in Forsmark (municipality of Östhammar) and in Laxemar (municipality of Oskarshamn). In
March 2011 SKB decided to submit licence applications according to the Act on Nuclear Activities and the Environmental Code
for a final repository at Forsmark. The license applications include comprehensive documentation to support that a KBS-3 repository
at Forsmark will meet requirements in laws and regulations, including a full evaluation of long term safety. Before selection,
SKB stated that the site that offers the best prospects for achieving long-term safety in practice would be selected. Based on experiences
previous safety assessments, a number of issues related to long-term safety need to be considered in the context of site comparison.
The factors include sensitivity to climate change such as periods of permafrost and glaciations, rock mechanics evolution
including the potential for thermally induced spalling and sensitivity to potential future earthquakes, current and future groundwater
flow, evolution of groundwater composition and proximity to mineral resources. Each of these factors related to long-term safety
for the two candidate sites is assessed in a comparative analysis of site characteristics. The assessment ...
2) TECHNICAL KNOW-HOW OF SELECTION PROCESS FOR THE HORONOBE
UNDERGROUND RESEARCH LABORATORY AREA AND SITE (wP-59088)
Takanori Kunimaru, Ryuji Takeuchi, Tatsuji Matsuzaki, Japan Atomic Energy Agency (Japan)
The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA)
to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the
host sedimentary formations at Horonobe, northern Hokkaido, Japan. The project consists of two major research areas, Geoscientific
Research and R&D on Geological Disposal, and proceeds in three overlapping phases, Phase I: Surface-based investigation
Phase, Phase II: Construction Phase and Phase III: Operation Phase, over a period of 20 years.
The early Phase I of the Horonobe URL project consisted of selecting a URL area and URL site, which involved establishing
fundamental factors relating to the geological environment and safety, surface-based investigations of the geological environment,
stepwise narrowing down of candidate or target areas (sites) from the whole Horonobe Town area through candidate URL areas
and, finally, to a URL site.
This study will be demonstrated the selection process for the URL area and URL site in sequence. Horonobe URL has been
declared to be constructed within whole Horonobe Town to be selected early in the fiscal year 2002. The Horonobe URL area/site
is required existence of host argillaceous sedimentary formations and saline groundwater. Further fundamental requirements ...
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