ML20039D900

LER 81-030/99X-0:on 811111,seal Return Flow from RCP Increased to Greater than 5 Gpm.Caused by anti-rotation Pin Failure or Seal Failure.New Seals & Pin of Modified Design Installed

ML20039D900
Person / Time
Site:	Indian Point
Issue date:	12/21/1981
From:	Davisson R CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20039D896	List: ML20039D895 ML20039D900
References
LER-81-030-99X, LER-81-30-99X, NUDOCS 8201060324
Download: ML20039D900 (2)

Text

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Attachment I

j c Docket No. 05000247 Consolidated Edison Co. Of N.Y., Inc.

Ler No.-81-030/99x-0 Indian Point Station, Unit 2

'During normal operation, the No. 1 seal: flow from 'i No. 23 RCP increased to greater than 5 GP:t and the thermal barrier differential pressure decreased from 70 psi to 10 psi.

The RCP was shut down and the unit brought to a shut down condition for repairs to the RCP.

The disassembly of the 23 RCP seal package revealed score marks on the seal ring and a broken seal runner anti-rotation pin. It is probable that foreign material got into the seals and caused the

-failure. The seal ring was difficult to remove during disassembly.

It is not certain whether the anti-rotation pin failure was a cause or effect of the seal failure. A new set of seals was installed.

The replacement anti-rotation pin was of the newer, modified design.

(cross-section and material change from 304ss to 17-4 ph steel).

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