05000267/LER-1979-046-03, /03L-0:on 791011,noted That Sequence of Manual Switching of Primary Coolant Low Level Dew Point Moisture Monitors Can Result in Degraded Mode of Limiting Conditions for Operation.Sys Operating Procedure Revised

/03L-0:on 791011,noted That Sequence of Manual Switching of Primary Coolant Low Level Dew Point Moisture Monitors Can Result in Degraded Mode of Limiting Conditions for Operation.Sys Operating Procedure Revised

ML19254F906
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/09/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19254F895	List: 05000267/LER-1979-046, Forwards LER 79-046/03L-0 05000267/LER-1979-046-03, /03L-0:on 791011,noted That Sequence of Manual Switching of Primary Coolant Low Level Dew Point Moisture Monitors Can Result in Degraded Mode of Limiting Conditions for Operation.Sys Operating Procedure Revised
References
LER-79-046-03L, LER-79-46-3L, NUDOCS 7911190386
Download: ML19254F906 (1)

LER-1979-046, /03L-0:on 791011,noted That Sequence of Manual Switching of Primary Coolant Low Level Dew Point Moisture Monitors Can Result in Degraded Mode of Limiting Conditions for Operation.Sys Operating Procedure Revised

Event date:
Report date:
2671979046R03 - NRC Website

text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION nm LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 lOn October 11, 1979, it was determined that due to procedural inadequacies, a parti-l l cular sequence of manual switching of the primary coolant low level dew point moisture l 0

3 l monitors could have resulted in a degraded mode of LCO 4.4.1.

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4 o s i Fort St. Vrain Technical Specification AC 7.5.2(b)3.

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9 10 11 12 IJ 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION LER RO EVENTYEAR REPORT NO.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l An approved field change notice (FCN 3738B) made the automatic trip on moisture l

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l moisture monitors to be tripped (rather than disabling by pairs). However, if the 7

l correct switching sequence was not followed it was possible to lock out a moisture l

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