ML22276A289

Attachment 2: HI-STORM 100 FSAR Proposed Revision 21C, Changed Pages

ML22276A289
Person / Time
Site:	Holtec
Issue date:	10/03/2022
From:	Holtec
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML22276A286	List: ML22276A287 ML22276A289 ML22276A290
References
5014952
Download: ML22276A289 (1)

Text

Holtec Letter 5014952 Attachment 2

c. Verify that the vent and drain port connections are closed such that the leakage past the port closure will not affect the port cover plate weldsDeleted.

Note:

ASME Boiler and Pressure Vessel Code [8.1.3],Section V, Article 6 provides the liquid penetrant inspection methods. The acceptance standards for liquid penetrant examination shall be in accordance with ASME Boiler and Pressure Vessel Code,Section III, Subsection NB, Article NB-5350 as specified on the Design Drawings. ASME Code,Section III, Subsection NB, Article NB-4450 provides acceptable requirements for weld repair. NDE personnel shall be qualified per the requirements of Section V of the Code or site-specific program.

d. Weld cover plate and perform NDE on the cover plate with approved procedures (See 9.1 and Table 2.2.15)

e. Repair anyd weld defects in accordance with the sites approved code weld repair procedures.

f. If using redundant port cover plates, install the redundant port cover plate, perform the multi-pass welds, and perform NDE on the redundant port cover plates with approved procedures (See 9.1 and Table 2.2.15). Repair any weld defects in accordance with the sites approved code weld repair procedures.

f.g. If not using redundant port cover plates, pPerform a helium leakage rate test on the cover plate welds. (See 9.1 and Table 2.2.15). Acceptance Criteria are defined in Technical Specification LCO 3.1.1.

g. Repair any weld defects in accordance with the sites approved code weld repair procedures.

h. Deleted.

i. Repeat for the drain port cover plate.

9. Perform a leakage test of the MPC vent and drain port cover plates as follows:

Note:

If the redundant port cover option is being implemented, Steps (a) through (g) are not performed.

Note:

The leakage detector may detect residual helium in the atmosphere from the helium injection process. If the leakage tests detect a leak, the area should be blown clear with compressed air or nitrogen and the location should be retested.

Note:

The following process provides a high concentration of helium gas in the cavity. Other methods that ensure a high concentration of helium gas are also acceptable.

a. If necessary, remove the cover plate set screws or plugs.

b. Flush the cavity with helium to remove the air and immediately install the set screws or plugs recessed below flush with the top of the cover plate.

HOLTEC INTERNATIONAL COPYRIGHTED MATERIAL HI-STORM 100 FSAR Proposed Rev. 21C REPORT HI-2002444 8-29 1 of 1