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Forwards final rept on results of plant noise reduction task force established to investigate spurious containment ventilation isolation initiations & LERs 1-86-007-01, 1-86-015-01,1-87-003-01 & 1-86-014-01.

Accession Number: ML16341F355

Date Released: Tuesday, February 28, 2017

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• ML16341F354 - Forwards final rept on results of plant noise reduction task force established to investigate spurious containment ventilation isolation initiations & LERs 1-86-007-01, 1-86-015-01,1-87-003-01 & 1-86-014-01. (12 page(s), 10/2/1989)
• ML16341F356 - LER 86-007-01:on 860710,15 & 30,automatic isolation of containment ventilation sys occurred.Caused by spurious noise signals on instrument ac power supply lines.Time delay circuitry installed & personnel trained. (12 page(s), 10/2/1989)
• ML16342B609 - LER 86-014-01:on 860916,control room ventilation sys automatically shifted from normal ventilation mode to pressurization mode.Caused by momentary alarm signal from monitor.Radiation monitoring sys upgrade program initiated. (10 page(s), 10/2/1989)
• ML16341F357 - LER 86-015-01:on 861001 & 08,automatic isolation of containment ventilation sys occurred.Caused by spurious noise signals.Time delay circuitry to containment ventilation isolation radiation monitors installed. (10 page(s), 10/2/1989)
• ML16342C233 - LER 87-003-01:on 870126,automatic initiation of containment ventilation isolation sys occurred.Caused by spurious noise signal.Time delay circuitry to containment ventilation isolation-radiation monitors installed. (8 page(s), 10/2/1989)