Resolution of Generic Safety Issues: Issue 37: Steam Generator Overfill and Combined Primary and Secondary Blowdown (Rev. 1) ( NUREG-0933, Main Report with Supplements 1–34 )
In AEOD/CO05,759 AEOD identified potential safety problems concerning steam generator overfill due to control system failures and combined primary and secondary blowdown. As a result of discussions with the Commissioners and the EDO, NRR reported495 that the steam generator overfill problem was to be integrated as a sub-task of USI A-47. In addition, separate work was scheduled on the matter of combined primary and secondary blowdown to establish its safety significance.
With regard to the issue concerning steam generator overfill, USI A-47 deals with control system failures leading to overfill. A related issue (Issue 67) includes actions which address steam generator overfill following a SGTR and are not part of USI A-47.
With regard to the safety issue concerning combined primary and secondary blowdown, this issue has been addressed in NUREG-0737, Items I.C.1 which is being implemented under MPAs F-04 and F-05.
The safety concerns identified in this issue are addressed in USI A-47 and Item I.C.1.