Find a few that may have been replaced, Try to capture. Replace Small systems. Test Larger systems.
using EPRI report, Region I may have already removed the requirement.
It is a commitment. NRC isn't going to allow exceptions. It was a push for the license renewal emphasis.
Stamp dates 1973, old grannel model C, then come to one that is out of normal.
Oconee, North Anna, Surry,
What is the failure rate? ZERO. That includes multiple issues. UL does testing and is reasonable.
NFPA 25 "Representative Sample" Grab a few from worst conditions in plant, i.e. Turbine building, and if those pass, then the others should as well.
Temperature. Diesel Building Exhaust Temperature failed due to heat. Had to change out the heads to improve reliability and pass. Some heads may need to be replaced due to heat. i.e. 250 F heads.
Region II plants that have performed 50 year sprinkler head sampling: Oconee, North Anna, Surry, Farley & Sequoyah.
Populations based around sprinkler head environment
Worked with scaffold workers to opportunistically get samples of sprinkler heads while scaffolding is up.
Documented heads replaced by drawing changes
Oconee reported no failures in testing performed so far
Wording out of NFPA 25 is representative, not 10%. Can use to leverage less heads being tested
St. Lucie tested recently and on a 8 or so head system, half of the sprinkler heads failed. The plan going forward is to replace all heads in system coming due going forward.
NEIL Peach Bottom Plant 50 year Sprinkler head testing Presentation notes:
Recommended to take pictures of sprinkler systems prior to shipping in case shipping damage occurs
(2002) NFPA 25 Section 5.3.1.2* A representative sample of sprinklers for testing per 5.3.1.1.1 shall consist of a minimum of not less than 4 sprinklers or 1 percent of the number of sprinklers per individual sprinkler sample, whichever is greater.
Peach Bottom took four sprinkler heads per system regardless of type
Head selected should not be just the easiest heads to reach as that may not be representative
Head testing requirements should include increasing test pressure on heads until they actuate. In addition, the failed heads should be shipped back to the site for retention. These actions will assist with evaluation of the failure and future failures by the site.
Peach Bottom self approved deletion of License Renewal commitment to 50 year sprinkler head inspection/testing based on previous performance ( 1 cycle testing of 12 systems) and EPRI “Results of Accelerated Aging for Sprinklers Used in Nuclear Power Plants Report”.
NEIL Peach Bottom Plant 50 year Sprinkler head testing Presentation notes:
Recommended to take pictures of sprinkler systems prior to shipping in case shipping damage occurs
(2002) NFPA 25 Section 5.3.1.2* A representative sample of sprinklers for testing per 5.3.1.1.1 shall consist of a minimum of not less than 4 sprinklers or 1 percent of the number of sprinklers per individual sprinkler sample, whichever is greater.
Peach Bottom took four sprinkler heads per system regardless of type
Head selected should not be just the easiest heads to reach as that may not be representative
Head testing requirements should include increasing test pressure on heads until they actuate. In addition, the failed heads should be shipped back to the site for retention. These actions will assist with evaluation of the failure and future failures by the site.
Peach Bottom self approved deletion of License Renewal commitment to 50 year sprinkler head inspection/testing based on previous performance ( 1 cycle testing of 12 systems) and EPRI “Results of Accelerated Aging for Sprinklers Used in Nuclear Power Plants Report”.
