05000302/LER-1980-008-03, /03L-0:on 800206,during ECCS Pump Operability Demonstration Surveillance SP-340,decay Heat Pump a Discharge Throttle Valve Would Not Control Flow Automatic Phase.Caused by Loose Wires on auto-manual Selector Switch

/03L-0:on 800206,during ECCS Pump Operability Demonstration Surveillance SP-340,decay Heat Pump a Discharge Throttle Valve Would Not Control Flow Automatic Phase.Caused by Loose Wires on auto-manual Selector Switch

ML19344D319
Person / Time
Site:	Crystal River
Issue date:	02/29/1980
From:	Lancaster K FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344D317	List: 05000302/LER-1980-008, Forwards LER 80-008/03L-0 05000302/LER-1980-008-03, /03L-0:on 800206,during ECCS Pump Operability Demonstration Surveillance SP-340,decay Heat Pump a Discharge Throttle Valve Would Not Control Flow Automatic Phase.Caused by Loose Wires on auto-manual Selector Switch
References
LER-80-008-03L, LER-80-8-3L, NUDOCS 8003110666
Download: ML19344D319 (2)

LER-1980-008, /03L-0:on 800206,during ECCS Pump Operability Demonstration Surveillance SP-340,decay Heat Pump a Discharge Throttle Valve Would Not Control Flow Automatic Phase.Caused by Loose Wires on auto-manual Selector Switch

Event date:
Report date:
3021980008R03 - NRC Website

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Reference LER 77-150, 78-53, and 79-33.

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The wires were replaced and DHV-110 was returned to service at 0635.

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SUPPLEMENTARY INFORMATION Report No.:

50-302/80-008/03L-0 Facility:

Crystal River Unit #3 Report Date:

29 February 1980 Occurrence Date:

6 February 1980 Identification of Occurrence:

One independent ECCS subsystem inoperable contrary to Technical Specification 3.5.2.

Conditions Prior to Occurrence:

Mode 1 power operation (100%)

1 Description of Occurrence:

At 0525 during the performance of ECCS Pump Operability Demonstration Surveillance SP-340, it was discovered that "A" decay heat pump discharge throttle valve would not control flow in automatic.

DRV-110 control was shifted and decay heat system flow was maintained in manual.

Maintenance actions were initiated.

Designation of Apparent Cause:

The cause of this event is attributed to loose wires found on the auto-manual selector switch located in engineered safeguards cabinet-1. An investigation of the event revealed that the wires were probably inadvertently pulled loose during the installation of the diverse isolation modification for NUREG 0578.

Analysis of Occurrence:

No affect upon the plant or general public.

"B" decay heat loop was operable.

Corrective Action

The wires were replaced, tightened and DHV-110 was returned to service at 0635. The workers involved were re-cautioned about the necessity for exercising care while working in the ECCS cabinets.

Failure Data:

This is the fourth occurrence reported for DHV-110. Reference LER 77-150, 78-53, and 79-33.

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