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The inspectors reviewed Operability Evalua … The inspectors reviewed Operability Evaluation 07-007, Revision 2. This operability evaluation was performed because the licensee identified that the design analysis for evaluation of the AFW tunnel flood seal covers did not include the effects of a high energy line break in the main steam isolation valve tunnels. Following this review, the inspectors questioned why a dynamic load factor as a result of the impulse pressure following a high energy line break had not been considered in an analytic calculation perform to support the operability evaluation. The licensee documented the inspectors concerns in IR 783849. Additionally, following a review of a subsequent revision of this operability evaluation, the inspectors questioned the licensees conclusion that the operability of the AFW hatches continued to be supported despite analytical results showing a factor of safety for the concrete expansion anchors supporting the hatches of less than 2.0, which is contrary to the guidance provided in NRC Bulletin 79-02, Pipe Support Base Plate Designs Using Concrete Expansion Anchors. Additionally, the inspectors noted that the operability evaluation did not address Section C.13 of NRC Technical Guidance 9900, Operability Determinations & Functionality Assessment for Resolution of Degraded or Nonconforming Conditions Adverse to Quality or Safety. Specifically, Section C.13 stated that if a structure was degraded, the licensee should assess the structures capability of performing its specified function. As long as the identified degradation did not result in exceeding acceptance limits specified in applicable design codes and standards referenced in the design basis documents, the affected structure was either operable or functional. At the close of the inspection period temporary modifications had been implemented at both units that restored the margin of safety to greater than 2.0. Pending additional follow-up by the inspectors for the timeliness of corrective actions, extent of condition, corrective actions and past operability, this item will remain open. (URI 005000456/2008003-03; 05000457/2008003-03) Included in the NRC review will be the licensees\' evaluations of structural degradations to determine their technical adequacy and conformance to licensing and regulatory requirementsmance to licensing and regulatory requirements

Discovered date

23:59:59, 30 June 2008 +

Docket

05000456 + and 05000457 +

Event date

23:59:59, 30 June 2008 +

Finding

05000457/FIN-2008003-03 +

Finding integer

3 +

Finding type

URI +

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Identified by

NRC identified +

Inspection procedure

IP 71111.15, Operability Determinations and Functionality Assessments +

Inspection report

IR 05000456/2008003 +

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03:05:17, 30 May 2018 +

NRC bulletin

NRC Bulletin 79-02, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts +

Person