The NRC is currently implementing its plan to have all pressurized‑water reactor (PWR) licensees perform a plant‑specific evaluation of the potential for excessive head loss across the containment sump screen because of the accumulation of debris on the containment sump screen. Key milestones from that plan to resolve Generic Safety Issue (GSI) 191, "PWR Sump Performance," are provided in the table below.

Based on the information available to date, continued operation of PWRs is justified until the plant‑specific evaluations are completed. To provide additional assurance until those evaluations are completed, the NRC asked the licensees of PWRs to implement interim compensatory measures. The NRC has reviewed the adequacy of the interim compensatory measures being implemented by licensees.

However, if the results ongoing NRC inspections and reviews indicate that unsafe conditions exist at any operating PWR, the NRC will take immediate plant‑specific actions to ensure the continued health and safety of the public. Also, if a licensee discovers that it is not in compliance with the NRC regulations during the implementation of the requested actions in Bulletin 2003‑01, it is required to take prompt corrective actions.

Date	Activity	Status
10/2008	Closure of GSI-191	Pending
06/2008	Complete Temporary Instruction 2515/166 inspections of plant changes	Ongoing
04/2008	Complete audit of selected plant analyses/modifications	Ongoing
02/2008	Initiate review of final supplemental generic letter responses	Pending
12/2005	Complete Temporary Instruction 2515/153 inspections of interim compensatory actions	Completed
12/2005	Close-out all Bulletin 2003-01 responses	Completed
03/2005	Licensees submit responses to generic letter	Ongoing
02/2005	Launch pilot program and identify pilot plants for application of sump evaluation methodology	Completed
01/2005	Public meeting on SE	Completed
12/2004	NEI 04-07 released (combining updated NEI evaluation methodology and SE)	Completed
12/2004	Issue safety evaluation (SE) on NEI evaluation methodology	Completed
12/2004	Participate in industry workshop on performing PWR sump evaluations	Completed
09/2004	Complete technical evaluation of NEI evaluation guidelines	Completed
09/2004	Issue generic letter requesting plant-specific evaulation of sump performance	Completed
varies	Licensees implement compensatory measures	Ongoing
08/2004	Complete review of all Bulletin 2003-01 responses	Completed
07/2004	Receive revision to NEI evaluation methodology	Completed
05/2004	Receive new version of NEI evaluation methodology	Completed
03/2004	Workshop with industry on NEI Draft evaluation methodology technical issues	Completed
11/2003	Issue Regulatory Guide 1.82, Rev. 3	Completed
11/2003	Receive NEI Draft Containment Sump Evaluation Methodology and obtain contract assistance from Los Alamos National Laboratory	Completed
10/2003	Issue Temporary Instruction 2515/153 related to Bulletin 2003-01	Completed
06/2003	Issue Bulletin 2003-01 requesting compensatory measures regarding sump performance	Completed
09/2002	NEI guidance document, NEI 02-01, published	Completed
09/2001	Complete technical assessment of PWR sump blockage	Completed