Historical Timeline

The NRC began its first reassessment of PWR sump and BWR suction strainer performance in 1979. The first reassessment (including all technical and regulatory actions) was completed in 1985.

In 1992, the NRC started a second reassessment of BWR suction strainer performance and completed the reassessment (including all technical and regulatory actions) in 2000.

In 1996, the NRC started a second reassessment of PWR sump performance and that reassessment is ongoing.

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See the following, for a graphical presentation of the information provided in the table below.

• Historical Timeline of NRC Regulatory Actions
• Historical Timeline of Events and NRC Technical Reports

Years	Regulatory Activity	Event	Technical Activity
1970-1975	Regulatory Guide 1.82
1976-1980
1981-1985	Regulatory Guide 1.82, Revision 1
1986-1990	Information Notice 88-28 Information Notice 89-77 Information Notice 90-07
1991-1995	Information Notice 92-71 Information Notice 92-85 Information Notice 93-34 Information Notice 93-02 Temporary Instruction 2515/125 Information Notice 94-57 Information Notice 95-06 Bulletin 95-02 Information Notice 95-47	Barseback, Sweden Perry Limerick	Head loss tests Debris generation tests
1996-2000	Information Notice 96-10 Bulletin 96-03 Regulatory Guide 1.82, Revision 2 Information Notice 96-27 Information Notice 96-55 Information Notice 96-59 Generic Letter 96-03 Generic Letter 97-04 Generic Letter 98-04 Regulatory Guide 1.54, Revision 1	LaSalle	Debris transport tests Debris erosion tests
2001-2003	Bulletin 2003-01
2004-	Generic Letter 04-02 Information Notice 05-26 Quick Look Report Supplement 1: Additional Results of Chemical Effects Tests in a Simulated PWR Sump Pool Environment Enclosure: Chemical Effects/Head-Loss Testing Quick Look Report,  Tests ICET-3-4 to 11. Industry Actions		Chemical Effects