05000261/FIN-2012005-04
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Finding | |
|---|---|
| Title | Questions Regarding the Adequacy of the Fill and Vent Procedure for the Residual Heat Removal Heat Exchangers |
| Description | Procedure OP-201-1, RHR System Venting directs system venting by a series of static and dynamic venting evolutions. The inspectors noted that the procedure did not specify the minimum flowrates necessary to ensure an adequate dynamic flush of the HXs. Specifically, the inspectors identified that dynamic venting of the system is performed by establishing flow via both the RHR HXs and its bypass line, which reduces the effective flow available to dynamically vent the HXs. The licensee indicated that following the fill and vent procedure, operations performs a post maintenance test (per OST-253, Comprehensive Flow Test for the RHR Pumps ), before returning the system to service, that establishes full flow through the HXs and would completely vent the HXs if the initial fill and vent was not successful. The inspectors was concerned because establishing full flow through the HXs with a large enough void size inside the HXs could potentially result in a water hammer condition that exceeds the structural design limitations of the system. The licensee is performing an evaluation to determine if any voids could be left in the HXs after fill and vent, and what the potential effects on the system could be. The inspectors determined that this issue will remain unresolved pending additional inspection to evaluate the licensees evaluation. This issue will be identified as URI 05000261/2012005-04, Questions Regarding the Adequacy of the Fill and Vent Procedure for the Residual Heat Removal Heat Exchangers |
| Site: | Robinson  |
|---|---|
| Report | IR 05000261/2012005 Section 4OA5 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Laughlin M Bates M Meeks R Musser S Walker A Alen C Scott D Lanyi J Eargle J Hickeya Aleng Nicely G Ottenberg H Campbell J Bartleman M Riley P Cooper R Nease S Walker |
| INPO aspect | |
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Finding - Robinson - IR 05000261/2012005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Robinson) @ 2012Q4
Self-Identified List (Robinson)
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