ML19248D404
| ML19248D404 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/07/1979 |
| From: | James Buchanan NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | NRC OFFICE OF STANDARDS DEVELOPMENT |
| References | |
| NUDOCS 7908150745 | |
| Download: ML19248D404 (3) | |
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UNITED STATES 3'-
NUCLEAR REGULATORY COMMISSION
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Distribution FROM:
John Buchanan, Environmental Protection Standards Branch Office of Standards Development Enrice F. Conti, Chief, Environmental Protection THRU:
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S+,andards Branch, SD
SUBJECT:
USE OF TLD'S AS N0BLE GAS EFFLUENT MONITORS FOR POWER REACTORS - SUPPLEMENTAL INFORMATION FROM CANADA Lake Barrett, in his memorandum of June 28, 1979, reports that TLD's have been installed in the ventilation stack release points of Swedish pcwcr reactors to provide some quantitative infomation for large accidental releases if the effluent monitors go offscale.
A similar use of TLD's in Canada has been reported by Ontario Hydro y2/,
The gama-ray energy response characteristics and wide detection range of TLD's indicated that they could be employed as a backup to the on-line stack effluent noble gas monitors, particularly for emergency purposes.
An experimental setup was installed in the Pickering NGS ventilation stack.
Both the noble gas gartina radiation in the stack and external background radia-tion were detected coincidentally with two sets of TLD's which were periodically evaluated. The noble gas effluent was coincidentally measu.ed with a gama-ray spectrometer and the Ci-MeV totalized for each TLD evaluation period. They concluded that TLD's in such an arrangement could measure noble gas release levels of (1% of their emission limits with good accuracy.
Based on % reports from Sweden and Canada, it appears that the use of TLD's as backt.
'le gas effluent monitors for U.S. power reactors merits further study.
References:
MM. J. Kabat, " Monitoring of Gaseous Effluents in Ontario Hydro", Monitorino of Airborne and Licuid Radioactive Releases from Nuclear Facilities to the Envi ronment, IAEA Safety Series No. 46, pp. 49-50 (1978).
This article is extracted from the following paper:
2/"Recent Developments in Gaseous Effluent Monitoring in bntario Hydro",
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Monitoring of Airborne and Liouid Releases from Nuclear Facilities. (Proc.
Symp. Portoroz,1977), IAEA, Vienna (1978), 261.
John D. Buchanan Environmental Protection Standards Branch Office of Standards Development cc: See Attached
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