Computer Modeling of In-Reactor Gamma-Ray Spectroscopy for Garter Spring Position Determination
9th International Conference on CANDU® Maintenance - 2011 December 04-06

Presented at:
9th International Conference on CANDU® Maintenance
2011 December 04-06
Toronto, Canada
Session Title:
Getting it Right Session B2

Krassimir Stoev (AECL Nuclear Laboratories)
Stuart Craig (Atomic Energy of Canada Limited)


Locating the position of “garter spring” spacers in the annulus between the pressure tube and the calandria tube is a key factor in reactor fitness-for-service evaluation.  Computer modelling of the applicability of in‑reactor gamma spectroscopy for locating garter springs made of Inconel X‑750 is presented.  Based on the performed calculations, the 320 keV gamma-line from the 51Cr in the Inconel X‑750 garter spring, detected by a 1 mm2 x 1 mm CdTe detector, is found to be on the order of 103 cps, with an estimated signal‑to‑noise ratio of 5:1.  The implementation of the proposed in-reactor gamma‑spectroscopy technique is discussed.

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