05000285/FIN-2013008-07
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Finding | |
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| Title | Administrative Controls for a Technical Specification for LOW River Level |
| Description | The team identified an unresolved item associated with the technical specification for low river level and its use of administrative controls. The team reviewed the Technical Specification 2.16, River Level, as part of their review of the extent of condition review for the Yellow flooding finding. The team noted that the technical specification was applicable to the Missouri River level at the intake structure. The objective of the technical specification was to specify the maximum and minimum Missouri River levels which must be present to assure safe reactor operation. The team noted during their review of low river level procedures that the design basis low river level for FCS was 976 feet 9 inches. The team also noted that plant procedures for low river level have operators secure the raw water pumps at an intake cell level of 976 feet 9 inches as prescribed by the raw water pump vendor manual The two levels, river level and cell level, represent two physically different water levels which are not the same. Because of the licensees use of trash racks and travelling screens between the intake cell and the river, cell level will be lower than river level. Calculation FC 07384 described the relationship of intake cell level and river level and highlighted that intake cell level will be at least 1 inch lower than river level due to the differential pressure across the racks and screens. As a result, raw water pumps would have to be secured by procedure prior to lowering river level reaching its lower technical specification value and the raw water pumps would not be available for heat removal. The team questioned how the technical specification required action to place the plant in cold shutdown at a river level 976 feet 9 inches could be carried out with the raw water pumps secured by procedure. The team also questioned whether basing action in the technical specification on a river level of 976 feet 9 inches was conservative, or whether a higher river level would be more appropriate to assure plant safety. When questioned by the team, the licensee produced Condition Report CR 2006-03381 which previously evaluated this issue. The condition report corrective actions initially were focused towards initiating a license amendment, but later the corrective actions focused on revising the technical specification bases. A plant memorandum reviewed by the team summarized the final actions as follows: It was decided that the current technical specification minimum river level of 976 feet 9 inches is valid as the lower limit of operability but that additional information was needed to define higher operational limits that would be dependent on plant conditions. Revisions to Technical Specification 2.4 and 2.16 Basis Sections were made (TSBC 07-002-0) to clarify that the minimum submergence water level of 976 feet 9 inches required for operability of raw water pumps applies to the cell level at the pump suction, which can be lower than river level due to head losses across the trash racks, traveling screens and other components that result from debris and/or icing. The team considered these actions to be administrative controls, and therefore, Administrative Letter 98-10, Dispositioning of Technical Specifications That Are Insufficient to Assure Plant Safety, would be applicable. Administrative Letter 98-10 states, Imposing administrative controls in response to an improper or inadequate technical specification is considered an acceptable short-term corrective action. The staff expects that, following the imposition of administrative controls, an amendment to the technical specification, with appropriate justification and schedule, will be submitted in a timely fashion. This issue was entered into the CAP as Condition Report CR 2013- 04733. Additional NRC inspection is necessary to determine if this case was an instance of untimely corrective action for a deficient technical specification. The team considered this to be an unresolved item, URI 05000285/2013008-07, Administrative Controls for a Low River Level Technical Specification. |
| Site: | Fort Calhoun  |
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| Report | IR 05000285/2013008 Section 1R21 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Buchanan B Hagar G Miller M Cummings P Elkmann S Hedger S Schneidera 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 |
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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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