05000302/LER-1980-027-01, /01T-0:on 800728,in Mode 5,while Performing OP-401 Core Flooding Sys,Check Valve CFV-79 Failed Allowing About 500 Gallons of Liquid to Enter Nitrogen Sys Via NGV-4. Apparently Caused by CFV-79 Failure & Open NGV-4

/01T-0:on 800728,in Mode 5,while Performing OP-401 Core Flooding Sys,Check Valve CFV-79 Failed Allowing About 500 Gallons of Liquid to Enter Nitrogen Sys Via NGV-4. Apparently Caused by CFV-79 Failure & Open NGV-4

ML19331B517
Person / Time
Site:	Crystal River
Issue date:	08/04/1980
From:	Neuschaefer E FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19331B515	List: 05000302/LER-1980-027, Forwards LER 80-027/01T-0 05000302/LER-1980-027-01, /01T-0:on 800728,in Mode 5,while Performing OP-401 Core Flooding Sys,Check Valve CFV-79 Failed Allowing About 500 Gallons of Liquid to Enter Nitrogen Sys Via NGV-4. Apparently Caused by CFV-79 Failure & Open NGV-4
References
LER-80-027-01T, LER-80-27-1T, NUDOCS 8008120380
Download: ML19331B517 (2)

LER-1980-027, /01T-0:on 800728,in Mode 5,while Performing OP-401 Core Flooding Sys,Check Valve CFV-79 Failed Allowing About 500 Gallons of Liquid to Enter Nitrogen Sys Via NGV-4. Apparently Caused by CFV-79 Failure & Open NGV-4

Event date:
Report date:
3021980027R01 - NRC Website

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SUPPLEMENTARY INFORMATION 50-302/80-027/OlT-0 Facility:

Crystal River Unit #3 Report Date:

4 August 1980 Occurrence Date:

28 Jnly 1980 Identification of Occurrence:

Uncontrolled release of radioactive liquid to the environment exceeding ten (10) ti=es the maximum permissible concentration for Co-60 averaged over a twenty-four (24) hour period and a i sss of one (1) day or more of the operation of the facility.

Conditions Prior to occurrence:

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Mode 5 cold shutdown.

Description of Occurrence:

While perfor=ing GP-401, Core Floeding System, for the purpose of bubbling nitrogen through Core 11ood Tank "A" for mixing prior to sampling, Core Flood Check Valve CFV-79 failed, allowing approximately 500 gallons of liquid from the core flood tank to enter the nitrogen system via the low pressure nitrogen header isolation valve NGV-4.

The liquid backflowed through the nitrogen system into an unrestricted area and was released to the environment via nitrogen relief valve, NGV-215. Analysis of the liquid released determined it to contain 1.42 E-2 pCi/ml. Lealuations based on collected soil samples indicated that 120 gallons had been re-leased, making the total activity released 1.07;mCf.' Air samples taken immediately after discovery of the affected spill area indicated no airborne activity.

Designation of Apparent Cause:

The apparent cause of this event is attributed to the failure of Core Flood Check Valve CFV-79, and the open position of low pressure nitrogen header isolation valve, NGV-4, which is normally locked closed.

Analysis of Occurrence:

There was no affect upon the general public as a result of this event.

l The majority of the contamination has been cleaned up.

Decontamination i

will continue until 10 CFR 20 limits have been met.

Corrective Action

i Perform decontamination of affected nitrogen systen piping and localized I

spill area. Conduct a failure evaluation of core flood check valve CFV-79, and revise appropriate Operating Procedures to prevent recurrence l

of this type event.

Fcilure Data:

l This is the fourth occurrence of this type reported; however, the first l

of this type involving a liquid release.

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