Neutron dosimetry in the Three-Mile Island Unit 2 reactor cavity with solid-state track recorders

Author: Gold, R.
Published: United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description: microfiche : negative ; 11 x 15 cm
Additional Creators: Fricke, V. R., Greenborg, J., McElroy, W. N., Preston, C. C., Rao, S. V., Roberts, J. H., and Ruddy, F. H.

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Summary

Solid-state track recorder (SSTR) neutron dosimetry has been conducted in the Three-Mile Island Unit 2 (TMI-2) reactor cavity (i.e., the annular gap between the pressure vessel and the biological shield) for nondestructive assessment of the fuel distribution. Two axial stringers were deployed in the annular gap with 17 SSTR dosimeters located on each stringer. SSTR experimental results reveal that neutron streaming, upward from the bottom of the reactor cavity region, dominates the observed neutron intensity. These absolute thermal neutron flux observations are consistent with the presence of a significant amount of fuel debris lying at the bottom of the reactor vessel. A conservative lower bound estimated from these SSTR data implies that at least 2 tonnes of fuel, which is roughly 4 fuel assemblies, is lying at the bottom of the vessel. The existence of significant neutron streaming also explains the high count rate observed with the source range monitors (SRMs) that are located in the TMI-2 reactor cavity.

Report Numbers

DE85018470; HEDL-SA-3293; CONF-850933-1

Other Subject(s)

Collection

NTIS collection.

Note

DOE contract number: AC06-76FF02170
OSTI Identifier 5343294
Research organization: Burns and Roe, Inc., Middletown, PA (USA).
Research organization: General Public Utilities Nuclear Corp., Middletown, PA (USA).
Research organization: Hanford Engineering Development Lab., Richland, WA (USA).

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Neutron dosimetry in the Three-Mile Island Unit 2 reactor cavity with solid-state track recorders

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