05000302/LER-1980-038-03, /03L-0:on 800916,during ECCS Pump Operability test,DHV-111 B Decay Heat Pump Discharge Throttle Valve Would Not Control Flow in Automatic.Caused by Roller Nut Not Engaging Actuating Cam.Roller Nut Adjusted

/03L-0:on 800916,during ECCS Pump Operability test,DHV-111 B Decay Heat Pump Discharge Throttle Valve Would Not Control Flow in Automatic.Caused by Roller Nut Not Engaging Actuating Cam.Roller Nut Adjusted

ML19338F540
Person / Time
Site:	Crystal River
Issue date:	10/06/1980
From:	Neuschaefer E FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338F538	List: 05000302/LER-1980-038, Forwards LER 80-038/03L-0 05000302/LER-1980-038-03, /03L-0:on 800916,during ECCS Pump Operability test,DHV-111 B Decay Heat Pump Discharge Throttle Valve Would Not Control Flow in Automatic.Caused by Roller Nut Not Engaging Actuating Cam.Roller Nut Adjusted
References
LER-80-038-03L, LER-80-38-3L, NUDOCS 8010200485
Download: ML19338F540 (2)

LER-1980-038, /03L-0:on 800916,during ECCS Pump Operability test,DHV-111 B Decay Heat Pump Discharge Throttle Valve Would Not Control Flow in Automatic.Caused by Roller Nut Not Engaging Actuating Cam.Roller Nut Adjusted

Event date:
Report date:
3021980038R03 - NRC Website

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SUPPLE M ARY INFORMATION Report No.:

50-302/80-038/03L Facility:

Crystal River Unit #3

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Report Date:

~ 6 Octcher 1980 Occurrence Date:

.16. September 1980

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Ident: fication of Occurrence:

Failure to have two (2) independent ECCS' subsystems operable Centrary to Technical Specification 3.5.2.

Conditions-Prior to Occurrence:

Mode 1 power operation (92%).

Description of Occurrence:

At 2245 during performance of SP-340 ECCS Pump Operability, it was. discovered that DHV-lll "B" decay heat pump discharge throttle valve, would not control flow in automatic. DHV-lll did respond in manual centrol; maintenance actions were initiated and operability was restored at 0330 on 17 September 1980.

Designation of Apparent Cause:

The' cause is -attributed to the roller nut not engaging the actuating cam for high alarm in the switch that operates the valve operator motcr.

Analysis of Occurrence:

- There was-no effect upon the general public health or safety.

Redundancy was maintained by the "A" decay heat loop.

Corrective Action

" The roller nut was adjusted and the cwitch was functionally checked. The history of this instrument has been reliable. No

_ general problem is identified, however, an engineering evaluation-of-DHV-110 and DHV-lli control method is in progress.

Failure-Data:

This is the third occurrence for DHV-111 and the twelfth event reported under this Specification.

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