2001 Abstract

2014 RETS-REMP & Groundwater Workshop, June 23-27, 2014, Westin Savannah, Savannah, GA
Sponsored by Nuclear Energy Institute

http://www.nei.org/Conferences/RETS-REMP-Workshop

Containment Release Criteria

John W. Doroski

Dominion Nuclear Connecticut / Millstone Station

Abstract

1.0 PURPOSE

To provide updated and comprehensive program for ensuring proper control of radioactive releases from primary containments for Millstone Units 2 and 3. This program provides:

	criteria for sampling that may be additional to the requirements of the REMODCM
	criteria for decisions on release paths and filtration necessary to maintain doses ALARA
	accounting requirements for the annual effluent report This document only addresses containment releases during normal operation, not post LOCA. This document also does not address containment releases that may be released via the equipment hatch when it is open.

2.0 BACKGROUND

Several station references provide guidance on containment discharges; some of this guidance is outdated (e.g., Revision 21 of the REMODCM includes changes in some of the bases for this criteria). Furthermore, review of the data for the last several years indicates that the majority of the iodine and particulate effluents (and resulting public dose consequences) are released from the containment during refueling outages. Also, per a recent INPO assist visit, more control is needed.

3.0 DISCUSSION

A. General Discussion:

The control and accounting of airborne radioactivity releases from the containment can be complicated. This document will define:

	when a containment release is considered a batch release and when it is continuous
	when the sampling requirements of the REMODCM apply
	when pre-release samples are required
	criteria for selection of release path (filtered or unfiltered)
	criteria for use of portable filtration units
	distinctions between vents and purges and the controls required for each (and MP3 drawdowns)
	criteria for not allowing a release since REMODCM dose rate or dose limits may be exceeded
	when and how to avoid double accounting of the curies released
	criteria for re-sampling once a release is in progress
	calculating the activity released and avoiding over-conservative estimates

North American Technical Center
Last Updated 03/13/2002

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