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PWR - LLRT vs ILRT for Secondary Side Steam Generator

PWR - LLRT vs ILRT for Secondary Side Steam Generator

PWR - LLRT vs ILRT for Secondary Side Steam Generator

(OP)
Hi. For PWRs, can anyone explain why containment isolation valves on secondary side of steam generator (MSIV, MFW, SGBD) are not Type C Local Leak Rate Tested (LLRT)? The tests for these seem to be combined during Type A ILRT. I see various plants using this approach but cannot find any reg document explaining why it is allowed i.e. 10CFR50 Appendix A, Appendix J, SRP 6.2.4, SRP 6.2.6, ANS/ANSI 56.8.

The secondary side of steam generator is also considered an extension of the containment boundary. How?

Thanks for helpful responses.


RE: PWR - LLRT vs ILRT for Secondary Side Steam Generator

Been a long, long time since I did anything with leak rate testing, but I think it has to do with the fact that they are a closed system inside containment.

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