GSI-191 Sump Strainer Replacement at
Progress Energy's Robinson Nuclear Plant

One of the greatest regulatory challenges in recent years for Pressurized Water Reactors has been the resolution of the US NRC's Generic Safety Issue (GSI) 191 and the associated response to Generic Letter (GL) 2004-02. GL-2004 was specifically focused on potential impact of debris blockage at the emergency recirculation sumps following a design basis accident and consequences of potential down stream debris on essential plant equipment. ENERCON supported 14 U.S. nuclear units and 11 foreign nuclear units in resolution of this issue. A specific example is the H.B. Robinson Nuclear Plant. At Robinson, ENERCON developed the following:

• NEI 02-01 Plant walk downs and debris identification. This was used as input to the NEI 04-07 Analysis.
• 4,200 ft2 ENERCON Top-Hat Strainer System including ENERCON's Debris Bypass Eliminator, patent pending.
• Qualification Testing of the prototype strainer system. This includes successful testing with predicted chemical effects debris loads.

In summary, the new ENERCON Top-Hat Strainer System successfully addressed all known issues as identified in GL-2004 for the H.B. Robinson Nuclear Plant.

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