05000287/LER-1978-010-03, /03L-0:on 780322,no Flow Found Through B LPIS Cooler During Performance Test.Caused by Broken Valve Position Indicator.Valve Opened & Indicator Repaired

/03L-0:on 780322,no Flow Found Through B LPIS Cooler During Performance Test.Caused by Broken Valve Position Indicator.Valve Opened & Indicator Repaired

ML19340A136
Person / Time
Site:	Oconee
Issue date:	04/21/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340A133	List: 05000287/LER-1978-010-03, /03L-0:on 780322,no Flow Found Through B LPIS Cooler During Performance Test.Caused by Broken Valve Position Indicator.Valve Opened & Indicator Repaired
References
LER-78-010-03L, LER-78-10-3L, NUDOCS 8001100601
Download: ML19340A136 (2)

LER-1978-010, /03L-0:on 780322,no Flow Found Through B LPIS Cooler During Performance Test.Caused by Broken Valve Position Indicator.Valve Opened & Indicator Repaired

Event date:
Report date:
2871978010R03 - NRC Website

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lo t 2l l Durine a performance test on the LPSW system, it was discovered that no l

l"3TTl I flow was indicated through the B LPI Cooler.

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f'o"TT1 I valve 3LPSW-78 was closed, preventing the flow. This valve is normally I

eI open. The valve was returned to its open condition. The inoperability of t o is 11 LPI Cooler B did not prevent the system f rom performing its de:ay heat io ;i; l removal requirements; if needed, because only one cooler is required and io,eil Cooler A was available.

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iiioi l The cause of the valve closure was the fact that the valve opens " backwards",

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gi noticed to be partially open earlier the same day during a valve lineup gl check and when the operator " opened" the valve he, in fact, closed it.

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' DUKE POWER COMPANY OCONEE UNIT 3-Report Number: 'RO-287/78-10 Report Date: April 21, 1978.

Occurrence Date:

March 22, 1978 j-Facility: - Oconee Unit 3, Seneca, South Carolina Identification of Occurrence:

Low Pressure Injection System Cooler B Inoperable Conditions Prior to Occurrence:

100% Full Power Description of Occurrence:

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- At approximately 0630 on March 22, 1978 during the performance of OP/3/A/1104/10, Low Pressure Service Water (LPSW) System Valve Lineup Check, it was noted that valve 3LPSW-78 was neither fully open or closed. The utility operator was

' directed to open the valve; but, when he attempted to do so, he inadvertently closed the valve.

The valve operates in the unusual clockwise-to-open configuration..The mechanical position indicator was broken so that his error was not immediately detectable. At approximately 0830 during the performance of PT/3/A /025/1, LPSW Performance Test, it-was discovered that no flow could be established through the B cooler. The subsequent investigation indicated the' erroneous valve closure and the valve was opened by 0845.

Apparent Caus' of Occurrence:

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. The cause.of the occurrence was the broken position indicator coupled with the clockwise-to-coen characteristic of the handwheel.

Analysis of Occurrents:

The closure of valve LPSW-78 removed LP Cooler B'from service. One cooler

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is necessary for decay heat removal (FSAR Section 6.1.2.7).

Since LP Cooler A was available, the occurrence caused no loss-of-function to the system.

Public health and safety were not endangered.

Corrective Action

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The valve was' opened to return LP Cooler-B to service. All clockwise-to-open'valvesfat-the Oconee Station will be identified and tagged and-any.

broken position indicators:will be repaired.

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