DESCRIPTION
In AEOD/CO05,[1]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 reported[2]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.
CONCLUSION
The safety concerns identified in this issue are addressed in USI A-47 and Item I.C.1.
[1] AEOD/C005, "AEOD Observations and Recommendations Concerning the Problem of Steam Generator Overfill and Combined Primary and Secondary Blowdown," Office for Analysis and Evaluation of Operational Data, U.S. Nuclear Regulatory Commission, December 17, 1980. [8101150366]
[2] Memorandum for C. Michelson from H. Denton, "Steam Generator Overfill and Combined Primary and Secondary Blowdown," May 27, 1981. [8106100241]