ML19274D447

LER 78-071/03L-0 on 781224:failure of Sample Pump for Radiation Monitor RMA-6.Caused by Worn & Distorted Carbon Vanes in Pump

ML19274D447
Person / Time
Site:	Crystal River
Issue date:	01/15/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19274D444	List: ML19274D443 ML19274D447
References
LER-78-071-03L, LER-78-71-3L, NUDOCS 7901240139
Download: ML19274D447 (2)

Text

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, At 1300 the cample pump for Rad tiori Mo0itor RMA-6 f ailed, rendering ,

o a Ithe containment atmospheric Iodine and caseous radioactivity monitoring I ,

ITiT1 I system inoperable. This is contrarv to Technical Specification 3.4.6.1. I o 33 ,No effects c public health and safety as a redundant monitoring system ,

o. ;was available and operable. Maintenance restored operability in 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. ,

,,, ,Four previous occurrences reported, one previously reported pump failure. ,

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. SUPPLEMENTARY INFORMATION

1. Report No.: 50-302/ 78-071/03L-0

2. Facility

• Crystal River Unit #3

3. Report Date: 15 January 1979

4. Occurrence Date: 24 December 1978

5. Identification of Occurrence:

Inoperability of two of three reactor coolant systems leakage detection systems contrary to Technical Specification 3.4.6.1.

6. Conditions Prior to Occurrence:

Mode 1 power operation (99%).

7. Description of Occurrence:

At 1300 the sample pump for Radiation Monitor RMA-6 failed, rendering the Conta.1-ment atmospheric Iodine and gaseous radioactivity monitoring system inoperable.

The six hour action statement was entered and Work Request 4258 was initiated.

The sample pump was removed and replaced with a spare pump. Radiation Monitor RMA-6 was returned to service and declared operable at 1500, ending the six hour actica statement.

8. Designation of Apparent Cause:

The cause of this event is attributed to the failure of the RMA-6 sample pump.

The carbon vanes had worn and distorted causing the pump to overheat and trip.

9. Analysis of Occurrence:

There was no safety hazard to the plant or general public as redundant monitor-ing system was available.

10. Corrective Action:

No corrective action, as normal maintenance restored operability of the pump.

An engineering study is underway to evaluate RMA-6 pump failures. Results of this evaluation will determine any additional corrective action.

11. Failure Data: -

Four previously reported occurrences, but only one previously reported RMA-6 pump failure.

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