ML20280A777

List of Previous Holtec Applications Which Justify Use of Q/I

ML20280A777
Person / Time
Site:	07201032, Holtec
Issue date:	10/06/2020
From:	Holtec
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML20280A773	List: ML20280A774 ML20280A777 ML20280A778
References
5014910
Download: ML20280A777 (1)

Text

Holtec Letter 5014910, Attachment 2 List of Previous Holtec Applications which Justify Use of Q/I

1. Holtec submitted a new MPC68M heat load pattern in HISTORM 100 Amendment 12 (Submittal - ML16169A363, Approved ML18279A002 ). Total heat load was higher (=42.8 kW, Table 4.III.3a of the LAR) than the approved pattern (=36.9 kW, Table 4.III.3a of the LAR). All calculations were reperformed with the new proposed pattern.

2. Holtec submitted a new MPC68M heat load pattern in HISTORM 100 Amendment 14 (Submittal ML18331A056, Approval ML19295C567). Total heat load was lower (=38.92 kW, Table 4.III.3a of the LAR) but per assembly decay heats were higher than the approved pattern

(=42.8 kW, Table 4.III.3a of the LAR) i.e. Q/I is bounded by that previously approved value. Long term storage calculation was performed with the new heat load pattern and PCT results were compared. Since the PCT was also lower (=703F, Table 4.III.3a of the LAR) than the previously approved value (=708F, Table 4.III.3a of the LAR) no additional calculations were performed with the new pattern. The same approach is also proposed in the topical report.

3. Holtec submitted new heat load patterns for MPC37 in HISTORM FW Amendment 5 (Submittal ML18179A100, Approval - ML20163A701). Total heat load was lower (=37.4 kW for MPC37, Table 1.2.3d of the LAR) but per assembly decay heats were higher than the approved pattern

(=44.09 kW for MPC37, Table 1.2.3a of the LAR) i.e. Q/I is bounded by that previously approved value. Longterm storage calculation was performed with the new heat load pattern and PCT results were compared. Since the PCT was also lower (=700F, Table 4.4.2 of the LAR) than the previously approved value (=703F, Table 4.4.3 of the LAR), no additional calculations were performed with the new patterns. The same approach is also proposed in the topical report.