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Forwards LERs 86-048-00,86-049-00 & 86-051-00.LER 86-050-00 will be submitted under separate cover.

Accession Number: ML20210D483

Date Released: Tuesday, August 11, 2020

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• ML20210D478 - Forwards LERs 86-048-00,86-049-00 & 86-051-00.LER 86-050-00 will be submitted under separate cover. (1 page(s), 9/17/1986)
• ML20210D504 - LER 86-048-00:on 860819 & 20,unexpected RHR sys isolations occurred during performance of maint retest.Caused by inadequate surveillance test instruction (SVI) & poor jumper connection,respectively.SVI revised. (3 page(s), 9/17/1986)
• ML20210D518 - LER 86-049-00:on 860818 & 19,gaseous effluent vent stack flow estimates not performed once per 4 h as required by Tech Specs.Caused by personnel error.Operators counseled & administrative procedures revised. (3 page(s), 9/17/1986)
• ML20210D534 - LER 86-051-00:on 860818,discovered that RHR containment upper pool cooling isolation valves did not receive reactor vessel high pressure isolation signal as stated in FSAR Table 6.2-32.Surveillance instruction revised. (3 page(s), 9/17/1986)