ML19341D025

LER 81-003/03L-0:on 810129,conventional Waste Plant Discharge Flow Monitor Found Inoperable.Caused by Inaccurate Flow Readings Due to Inability of Instrument to Measure Continuous Discharge Flow.New Equipment Ordered

ML19341D025
Person / Time
Site:	McGuire
Issue date:	02/28/1981
From:	Ouellette R DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341D021	List: ML19341D020 ML19341D025
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8103040720
Download: ML19341D025 (3)

Text

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McGUIRE NUCLEAR STATION INCIDENT REPORT REPORT NCGER: 81-03 EEPORT DATE: February 13, 1981 OCCURRENCE DATE: January 29, 1981 FACILITY: McGuire Unit 1, Cornelius, NC IDENTIFICATION OF OCCURRENCE: Inoperable flow monitoring device on the Conventional Waste (WC) System.

DESCRIPTION OF OCCURRENCE: At 0845 hours0.00978 days <br />0.235 hours <br />0.0014 weeks <br />3.215225e-4 months <br /> on January 29, 1981, the Con-ventional Waste plant discharge flow monitoring device was discovered inoperable. This instrument does not give accurate flow readings and cannot measure continuous flow. This incident constituted a degraded mode of operation per Technical Specification 3.3.3.8 since the con-ventional water treatment line flow rate monitoring device must be operable at all times.

APPARENT CAUSE OF OCCURRENCE: The existing' flow element device used in the Conveational Waste plant discharge is an orifice; however, the 6 inch diameter discharge pipe does not stay water solid at all times so that discharge flow cannot be monitored accurately and continuously.

ANALYSIS OF OCCURRENCE: The WC flow monitoring device was designed to operate with the discharge pump running. In addition, an isolation valve was to be installed downstream of the flow element to keep the pipe water solid at all times. However, the valve was installed upstream of the orifice instead, due to an error in Design Engineering between Instrumentation and Systems Group. When Chemistry personnel began using the device, they claimed the equipment was not giving accurate and con-tinuous flow measurements. This is because they tried to use it on gravity flow, and they allowed the pipe and instrument lines to drain between pumped discharges. This problem was reported to the Shift Super-visor af ter going into Mode 6 and the instrument was declared inoperable.

Since there is only new fuel on site at this time, the WC System has no significance with respect to radiation that would affect the safety of the public.

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. o CORRECTIVE ACTION: An NSM report has been initiated to replace the existing equipment to a 'PRARSHALL FLUME' measuring device. The necessary equipnent has been ordered and will be installed. Chemistry Section is now monitoring discharge flow every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by two methods:

1) when the discharge pump is utilized, flow is measured using the pu=p head vs. flow curve; and 2) when gravity discharge is employed, flow is monitored using the weir structure (by measuring the height of water in the v-notch weir and calculating the flow).

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