Earlier this week, the U.S. Nuclear Regulatory Commission decided in a 3-1 vote not to pursue a rulemaking with regard to reactor containment protection and release reduction for boiling water reactors with Mark I and Mark II containments. As readers of the blog will recall, NEI COO Maria Korsnick explained in a post back in June why external containment vents were unnecessary in the wake of a new innovation that was developed by the industry in conjunction with the Electric Power Research Institute:
While this order clearly improved safety, we believed we could obtain additional safety benefit if we could ensure water could be added to the reactor to cool the damaged core and also prevent containment failure.
Working with my counterparts in the industry and the Electric Power Research Institute (EPRI), we remedied this problem by including water addition under these conditions. This was included in the industry’s guidance for implementing the vent order and endorsed by NRC.
Interestingly, the same water to cool the core will also act as a filter in containment. As industry and NRC research show, because the external filters are just tanks filled with water, the water in containment can be just as effective as an external filter. Taken together, it’s a solution that is innovative, elegant and cost-effective, one that ought to be a model for nuclear safety around the world going forward.
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