Attached please find Pilgrim Watch Comment Regarding
Additional Requirements For Containment Venting Systems For BWRs With
Mark I And Mark II Containments In Support Of Filters And Rupture Discs
prepared for the NRC Commissioners that will vote on whether or not to
require filters and rupture discs on vents used to relieve pressure from
the containment in a severe accident.
In a severe accident
the amount of radioactivity released offsite from an unfiltered vent
would be very large and damaging. It makes no sense not to add a filter
to protect our families and property from contamination. Filtered
systems are available, tested and in use today - for example in Sweden,
Germany, France, Switzerland and will be installed in Slovenia and
Japan that learned the hard way the danger of not requiring filters and
rupture discs before the accident.
Rupture discs are necessary
so that neither water nor electrical supply is needed and operator
intervention is not necessary to actuate the venting system to save
containment in a pressure buildup.
Lessons learned from
Fukushima showed the importance of requiring reactors designed like Mark
I & II’s in the U.S. to install filtered DTV’s in order to:
· Protect public health in the event that it is necessary to release.
· Assure operators follow orders to open the vent. As in Japan,
properly trained operators here are likely to decide not to open the DTV
when they should because they fear the effects offsite of significant
As part of the Fukushima Lessons Learned
Task Force, NRC Staff assigned to study whether to recommended
filtering, did do (November 2012). It only made sense when considering
that during normal operations and design based accidents gaseous
releases are filtered but they are not filtered during severe accidents
when the releases offsite will be the greatest.
consider contacting the NRC Commissioners in support of the attached
comments ASAP; and also alert your members and elected officials to do
the same. I attached a word version for your convenience.
affect all Mark I and Mark II BWRS that includes: Mark I BWR Reactors:
Browns Ferry 1, 2 & 3 (AL); Brunswick 1 & 2 (NC); Cooper 1 (NE)
Dresden 2 & 3 (Il); Duane Arnold 1 (IA); Fermi 2 (MI); Fitzpatrick
1 (NY); Hatch 1 & 2 (GA); Hope Creek 1 (NJ); Monticello 1 (MN);
Nine Mile Point 1 (NY); Oyster Creek 1 (NJ); Peach Bottom 2 & 3
(PA) ; Pilgrim 1 (MA); Quad Cities 1 & 2 (IL); Vermont Yankee 1
(VT). Mark II BWR Reactors: Columbia (WA); LaSalle, 1&2 (IL);
Limerick 1 &2 (PA); Nine Mile (NY); Susquehanna, 1&2(PA)
Pilgrim Watch, Director
148 Washington Street Duxbury, MA 02332
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