05000333/LER-1979-061-03, /03L-0:on 790905,during HPCI Subsys Logic Functional Test,Switch 3 Associated W/Level Instrument 02-3-LIS-72D Did Not Properly Pick Up Follower Relay.Caused by Wiring Error During Installation of New Switch

/03L-0:on 790905,during HPCI Subsys Logic Functional Test,Switch 3 Associated W/Level Instrument 02-3-LIS-72D Did Not Properly Pick Up Follower Relay.Caused by Wiring Error During Installation of New Switch

ML19209B225
Person / Time
Site:	FitzPatrick
Issue date:	10/03/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209B224	List: 05000333/LER-1979-061, Forwards LER 79-061/03L-0 05000333/LER-1979-061-03, /03L-0:on 790905,during HPCI Subsys Logic Functional Test,Switch 3 Associated W/Level Instrument 02-3-LIS-72D Did Not Properly Pick Up Follower Relay.Caused by Wiring Error During Installation of New Switch
References
LER-79-061-03L, LER-79-61-3L, NUDOCS 7910090351
Download: ML19209B225 (2)

LER-1979-061, /03L-0:on 790905,during HPCI Subsys Logic Functional Test,Switch 3 Associated W/Level Instrument 02-3-LIS-72D Did Not Properly Pick Up Follower Relay.Caused by Wiring Error During Installation of New Switch

Event date:
Report date:
3331979061R03 - NRC Website

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NAME OF PREPARER PHONE:

POL'ER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DCCKET NO. 50-333 ATTACHMENT TO LER 79-061/03L-0 Page 1

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During normal startup operations, while conducting F-ST-4E titled "HPCI Sub-system Logic Functional Test" to satisfy the requirements of Technical Specifications Appendix A, Table 3.2-2, i t was noted that Swi tch No. 3 associ-ated with level instrument 02-3-LIS-72D did not properly pick up i ts follower relay when the state of Switch No. 3 was changed as a part of F-ST-4E.

The other three switches (including the redundant channel) associated with the same parameter were verified operable therefore, the event did not represent any signi ficant hazard to the public health and safety.

Investigation revealed a wiring error had occurred during the installation of a new switch in June, 1979 When the new switch was installed its proper operat ion was veri fied utilizing F-ISP-3-2 ti tled " Reactor Low-Low / Low-Low-Low Water Level."

Review of F-ISP-3-2 revealed that the procedure did not require verification of proper switch actior by observation of the follower relay associ-ated with the switch.

The wi ring error w. s corrected and proper operation demonstrated on the following day.

To preclude events o'f this nature in the future, F-ISP-3-2 has been revised to requi re veri ficat ion of proper operation of the follower relay.

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