ML19270F682

LER 79-003/03L-0 on 790119:1-2301-45 Check Valve Leak Rate Was 190.3 Std Cubic Feet Per Hour.Caused by Failure of Gasketed Seating Surface Between Valve Body Seating & Disc. Check Valve Replaced W/New Exact Replacement Valve

ML19270F682
Person / Time
Site:	Quad Cities
Issue date:	02/16/1979
From:	Reed M COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17296A304	List: ML17296A303 ML19270F656 ML19270F659 ML19270F662 ML19270F668 ML19270F673 ML19270F676 ML19270F679 ML19270F682 ML19270F683 ML19270F684
References
LER-79-003-03L-07, LER-79-3-3L-7, NUDOCS 7903070370
Download: ML19270F682 (2)

Text

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,;; l While performing procedure QTS 100-18, HPCI Steam Exhaust Local Leak Rate Test, the j 2 ,  ; 1-2301-45 check valve leak rate was found to be 190.3 SCFH. This is in excess of the l 18.36 SCFH allowable limi t as speci fied by Technical Speci fication 4.7. A.2. i .2.b. ]

,; ; Leakage through the 1-2301-45 check vcive would not render the HPCI System inoperable. 3

- In addition, in the event of high suppression chamber pressure, the- ~manual stop i

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1. LER HUMBER: LER/R0 79-03/03L-0

11. LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit One IV. DOCKET NUMBER: 050-254 V. EVENT DESCRIPTION:

While performing procedure QTS 100-18, HPCI Steam Exhaust Local Leak Rate Test, the 1-2301-45 check valve leak rate was 190 3 SCFH, which is in excess of the 18.36 SCFH allowable limit. The Unit One reactor was in the Shutdown Mode for the current refueling outage.

Work Request 358-79 was written to initiate repairs.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The leakage through the 1-2301-45 check valve would not render the HPCI System inoperable; therefore, safe plant operation was not Jeoparidized. When operating under accident conditions the HPCI turbine exhaust passes through check valve 1-2301-45 and manual stop check 1-2301-74 and into the suppression pool.

In the event of high suppression chamber pressure, the manual stop check, 1-2301-74, would act as a backup to the 1-2301-45 check valve.

Vil. CAUSE:

The cause of the excessive leakage through the chec' valve was a failure of the gasketed seating surface between the valve body sect ring and disc.

Vill. CORRECTIVE ACTION:

The Mechanical Maintenance Department replaced the 1-2301-45 check valve with a new exact replacement, 24 inch Duo-Chek style "B", manufactured by Mission Valve. The new valve was tested on February 5 and found to have zero leakage.

One previous occurrence of excessive leakage through the 1-2301-45 valve was reported in RO 50-254/76-2 on February 2, 1976.