ML22276A284
| ML22276A284 | |
| Person / Time | |
|---|---|
| Site: | 07201032 |
| Issue date: | 10/03/2022 |
| From: | Holtec |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML22276A281 | List: |
| References | |
| 5018098 HI-2114830 | |
| Download: ML22276A284 (1) | |
Text
Holtec Letter 5018098 Attachment 2
- a. Attach the moisture removal system to the vent and drain port RVOAs. Other equipment configurations that achieve the same results may also be used.
- b. Drain the water from the annulus. For HI-TRAC VW Versions V and V2 keep the lower inflatable seal inflated to prevent cooling air flow through the annulus which extends the FHD drying times.
a.c. Stop the HI-DRIP Cooling System, if used.
b.d. Circulate the drying gas through the MPC while monitoring the circulating gas for moisture. Collect and remove the moisture from the system as necessary.
c.e. Continue the monitoring and moisture removal until LCO 3.1.1 is met for MPC dryness.
Note:
The demoisturizer module must maintain the temperature of the helium exiting the FHD below the Technical Specification limits continuously from the end of the drying operations until the MPC has been backfilled and isolated. If the temperature of the gas exiting the FHD exceeds the temperature limit, the dryness test must be repeated and the backfill re-performed.
d.f. Continue operation of the FHD system with the demoisturizer on.
e.g. While monitoring the temperatures into and out of the MPC, adjust the helium pressure in the MPC to provide a fill pressure as required by LCO 3.1.1.
f.h. Open the FHD bypass line and Close the vent and drain port RVOAs.
Warning:
A HI-TRAC VW Version V or V2 containing an MPC loaded with spent fuel assemblies shall NOT be left unattended to ensure that blockage of the air flow paths does not occur.
The HI-TRAC vents shall be monitored to be free from blockage once every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
g.i. For HI-TRAC VW Versions V and V2, deflate the lower inflatable annulus seal and remove the annulus shield to establish air flow through the annulus.
h.j. Shutdown the FHD system and disconnect it from the RVOAs.
i.k. Remove the vent and drain port RVOAs.
- 9. Verify that the vent and drain port connections are closed such that leakage past the port closure will not affect the port cover plate welds. Weld the vent and drain port cover plates and perform NDE in accordance with the licensing drawings using approved procedures.
Repair any weld defects in accordance with the applicable code Code and re-perform the NDE until the weld meets the required acceptance criteria.
HOLTEC INTERNATIONAL COPYRIGHTED MATERIAL REPORT HI-2114830 Proposed Revision 10E9 9-19 1 of 1