Published February 21, 1991 | Version v1
Patent Metadata-only

Estimating method and device for burnup degree of failed fuel element

Creators

Description

Inert gases containing 80Kr, 81Kr, 85Kr, etc., released from failed fuel elements are captured by an inert gas capturing device. A composition ratio of 81Kr and 85Kr is determined by decomposing and measuring the energy of radioactive rays in the captured inert gases by using a semiconductor detector having high decomposition performance such as a germanium detector as a radiation detector. Subsequently, a composition ratio of 85Kr and 80Kr is determined by an inert gas analyzing device using a mass spectrometer. Then, the burnup degree of failed fuel elements is estimated by determining the ratio of 81Kr and 80Kr, that is, the ratio of the released amount based on both of the compositions. This can save time and labor required for the inspection required for determining the fuel assembly containing failed fuel element in a reactor. (I.N.)

Availability note (English)

Available from JAPIO. Also available from INPADOC.

Additional details

Publishing Information

Imprint Pagination
6 p.
IPC:
Int. Cl. G21C17/06; G21C17/07.
IPC
Int. Cl. G21C17/06; G21C17/07.
Patent number
JP patent document 3-41396/A/

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
22077714
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
BURNUP; FAILED ELEMENT DETECTION; FUEL ASSEMBLIES; GE SEMICONDUCTOR DETECTORS; INERT ATMOSPHERE; KRYPTON 80; KRYPTON 81; KRYPTON 85; LMFBR TYPE REACTORS; MASS SPECTROMETERS; RADIATION DETECTORS
Descriptors DEC
BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BREEDER REACTORS; CONTROLLED ATMOSPHERES; DETECTION; ELECTRON CAPTURE RADIOISOTOPES; EPITHERMAL REACTORS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FAST REACTORS; FBR TYPE REACTORS; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; KRYPTON ISOTOPES; LIQUID METAL COOLED REACTORS; MEASURING INSTRUMENTS; MICROSEC LIVING RADIOISOTOPES; NUCLEI; RADIOISOTOPES; REACTORS; SECONDS LIVING RADIOISOTOPES; SEMICONDUCTOR DETECTORS; SPECTROMETERS; STABLE ISOTOPES; YEARS LIVING RADIOISOTOPES

Optional Information

Secondary number(s)
JP patent application 1-175458.