What is the concern related to credit for containment overpressure? Will the NRC approve the request by VY to credit containment overpressure?
In the ongoing review of the Vermont Yankee proposed license amendment to increase licensed power, the NRC is reviewing the licensee’s calculation of the net positive suction head, or NPSH, available for the emergency core cooling pumps should they be required for emergency operation. The staff requires numerous conservatism in those calculations to ensure that under the worst case the available NPSH will not be underestimated. One of the conservatisms that the staff has previously relaxed in the direction of realism is credit for pressure in containment that results from the postulated accident itself. About 20 boiling water reactors have been allowed to formally credit accident overpressure in NPSH calculations, following staff review to ensure that adequate safety margin is maintained by the remaining conservatisms. Vermont Yankee’s amendment request to credit accident overpressure is receiving the same scrutiny, and no decision has yet been made on the acceptability of their propos
Related Questions
- What is the concern related to credit for containment overpressure? Will the NRC approve the request by VY to credit containment overpressure?
- How can the NRC approve the VY request to credit containment overpressure since it is not in conformance with NRC regulations?
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