05000237/LER-1979-053-03, /03L-0:on 791003,trip of Fuel Pool Area Radiation Monitor Resulted in Autostart of Standby Gas Treatment Sys & Isolation of Rx Bldg Vent Sys.Caused by Diaphram Drift to Setpoint Shift

/03L-0:on 791003,trip of Fuel Pool Area Radiation Monitor Resulted in Autostart of Standby Gas Treatment Sys & Isolation of Rx Bldg Vent Sys.Caused by Diaphram Drift to Setpoint Shift

ML17174A111
Person / Time
Site:	Dresden
Issue date:	11/01/1979
From:	Badran S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A112	List: 05000237/LER-1979-053, Forwards LER 79-053/03L-0 05000237/LER-1979-053-03, /03L-0:on 791003,trip of Fuel Pool Area Radiation Monitor Resulted in Autostart of Standby Gas Treatment Sys & Isolation of Rx Bldg Vent Sys.Caused by Diaphram Drift to Setpoint Shift
References
LER-79-053-03L-01, LER-79-53-3L-1, NUDOCS 7911060423
Download: ML17174A111 (2)

LER-1979-053, /03L-0:on 791003,trip of Fuel Pool Area Radiation Monitor Resulted in Autostart of Standby Gas Treatment Sys & Isolation of Rx Bldg Vent Sys.Caused by Diaphram Drift to Setpoint Shift

Event date:
Report date:
2371979053R03 - NRC Website

text

Common.th Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS LTR #79-873

,Y October 31, 1979 James G. Keppler, Regional Director Directorate of Regulatory Operations.- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report ft79-53-03L-0, Docket #050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power. Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

BBS:lcg Enclosure

.tep nson Station Superintendent Dresden Nuclear Power Station cc:

Director of Inspec.tion & Enforcement Director of Management Information & Program Control File/NRC

e LICENSEE EVENT REPORT.* e

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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9 LICENS.EE CODE 14 15

. LICENSg.NUMBER 25 26 LICENSE TYPE JO 57 CAT 58

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60 61 DOCKET NUMBER 68 69 i:VENT CATE

• 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

CID I During normal operation, a spurious trip of U-3 "A" fuel pool ARM resulted. in ciuto CIIJ I.start of "Au SBGTS and isolation of RX Bldg. vent system.* "A" train ran for approx.

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"A" t as 18 sec and tripped.

'*'B train auto started in standby.

Su sequent Y, rain w manually started and ran properly with a flow of approx. 3800 CFM.

Since secondary containment integrity was maintained, safety significance of this event was minimal.*

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LEA/RO c-vENT YEAR

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CAUSE COMP.

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ATTACHMENT NPRD-4 ACTION FUTURE

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 43 44 47 I 'Low flow switch (2/3-7541:...4SB) had a high flow setting and caused the "A SBGTS train to trip.

Set point shift was due to diaphram drift.

Flow switch was recalibrated to normal setting and *proper operation of system was verified.*. A yearly surveillance ill] I will be initiated to ensure proper setting of low flow switches.

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