05000285/FIN-2013008-01
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Finding | |
|---|---|
| Title | Inadequate Procedure for Combating Frazil Ice |
| Description | The team identified a URI for a potentially inadequate procedure for combating frazil icing of the travelling screens. Description. The team performed a walkdown with a licensee senior reactor operator to determine the adequacy of the licensees preparations for the occurrence of a frazil ice event. The team noted three issues with the adequacy of the licensees procedure for such conditions, which was in Section V, Degraded River Conditions, of Procedure AOP-01, Acts of Nature, Revision 33. First, the procedure did not give direction to open a valve that would need to be opened to direct auxiliary steam to the travelling screens to melt the ice formed on the screens. Step 15 of Section V, Degraded River Conditions, of Procedure AOP-01, Acts of Nature, instructed operators to direct auxiliary steam to the travelling screens. The procedural step directs hooking up a high temperature hose to a fitting and throttling open valve AS-823. During the walkdown, the licensee and the team noted that the procedure did not include direction to open valve AS-811, a normally closed valve. Valve AS-811 would need to be opened in order to allow steam to the hose used to melt the ice formed on the travelling screens. Valve AS-811 was easily identified as being in the steam flowpath as it was adjacent to valve AS-823. Second, the team noted that the procedure lacked any personnel safety warnings associated with handling a hose with steam. The team did note, however, that gloves and a face shield were staged with the hose to protect personnel, however the procedure did not warn of the danger of handling live steam which is a condition rarely encountered by operators. Finally, the team noted that the procedure did not direct the operators where to direct the steam on the travelling screens, instead Procedure AOP-01, Step 15,Section V, simply instructed operators to initiate steam to the travelling screens. Also, the procedure gave no guidance for a strategy for preferential de-icing of one or more screens, such that an adequate river water flow path would be assured. This issue was entered into the CAP as Condition Report CR 2013-04309. The licensee informed the team that the susceptibility of frazil icing of the intake components was extremely low due to the low flow velocity of river water into the intake structure. The licensee provided Army Corps of Engineer reports which described the phenomenon. The team required additional inspection to determine if the flow into the intake structure was sufficiently low to preclude frazil ice formation. As a result, the team identified Unresolved Item URI 05000285/2013008-01, Inadequate Procedure for Combating Frazil Ice. |
| Site: | Fort Calhoun  |
|---|---|
| Report | IR 05000285/2013008 Section 4OA7 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | M Hayd Kernd Stearns G Apger G Ryan J Dean J Drake J Kirkland J Wingebach M Hay P Elkmann R Deese S Sanchez W Sifre B Larson C Norton C Zoiaa Klettc Smith M Davis J Josey C Bickett G Warnick M Hay J Brand J Groom M Keefe R Latta W Schaup J Watkins B Hagar A Allen J Wingebach K Martin L Wilkins S Morrow R Deese F Ramirez |
| INPO aspect | |
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Finding - Fort Calhoun - IR 05000285/2013008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fort Calhoun) @ 2013Q2
Self-Identified List (Fort Calhoun)
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