05000302/LER-1979-005-01, /01T-0 on 790123:facility Notified That During Accidents Such as double-ended Pipe Rupture,Rockwell Mfg Co Main Steam Isolation Valve May Not Close in Specified Time of 5-s Due to Forces on Valve Disc

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05000302/LER-1979-005-01, Discusses Commitment Stated in LER 79-005-01T-1 Re MSIV Valves Not Closing within Design Time of Five Seconds During Double Ended Pipe Rupture.Util Has Determined That Upgrading Air Circuit to Seismic Class I Will Not Be Nec

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