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Forwards DR Hunter 790904 memos identifying concerns developed during TMI-2 investigations re emergency feedwater nozzle transients & once-through steam generator thermal stresses.

Accession Number: ML20069D210

Date Released: Friday, October 25, 2024

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• ML20069D207 - Forwards DR Hunter 790904 memos identifying concerns developed during TMI-2 investigations re emergency feedwater nozzle transients & once-through steam generator thermal stresses. (2 page(s), 10/10/1979)
• ML20069D211 - Forwards memo identifying concerns developed by DR Hunter while assigned to TMI investigation. (1 page(s), 9/26/1979)
• ML20069D216 - Informs that investigation revealed emergency feedwater nozzles thermally cycled numerous times in past operation of facility.Licensee requested to provide complete transient record as of 790328. (1 page(s), 9/4/1979)
• ML20069D221 - Informs investigation revealed that once-through steam generator downcomer & RCS cold leg temp differential of 25 F exceeded number of times during accident.Transient limit requires review,evaluation & followup by licensee & NRC. (1 page(s), 9/4/1979)