ML19316A484

RO 269/77-30:on 771220,primary Leak Through Pressurizer Spray Bypass Valve RC-2 Indicated.Caused by Packing Leak on Pressurizer Spray Bypass Valve.Valve RC-2 Repacked & Tested for Leaks

ML19316A484
Person / Time
Site:	Oconee
Issue date:	01/19/1978
From:	DUKE POWER CO.
To:
Shared Package
ML19316A483	List: ML19316A482 ML19316A484 ML19316A485
References
RO-269-77-30, NUDOCS 7912110817
Download: ML19316A484 (1)

Text

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s DUKE POWD; COMPANY OCONEM UNIT 1 Reoort No.: R0-269/77-30 i

Report Date: January 19, 1978 Occurrence Date: December 20, 1977 Facilitv: Oconee Unit 1, Seneca, South Carolina l .

Identification of Occurrence: Primary leak through pressurizer spray bypass valve Conditions Prior to Occurrence: Unit at 100% full power Description of Occurrence:

l On December 20,, 1977 at 1558 the Reactor Building (RB) particulate mon'itor RIA-47 and RB iodine monitor RIA-48 alarmed. The rate of change of level of the RB Normal Sump indicated a primary less of approximately 2.8 gpm.

At 1716 a unit shitdown was commenced in compliance with T.S. 3.1.6.2 which requires unit shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> for unidentified leakage in

., excess of 1 gpm. At 2223 personnel entered RB and determined that the leak was in the area of the pressurizer but were unable to find the exact location of the leak. At 2245 the reactor was fully shut down. At 0700 on December 21, personnel re-entered the RB and determined that the leak was from the pressurizer spray valve bypass valve RC-2. The valve was re-packed. At 0800 on December 22, reactor startup was commenced.

Apparent Cause of Occurrence:

The cause of the incident was a packing leak on the pressurizer spray steam bypass valve.

2 Analysis of Occurrence:

The leakage was contained entirely within the RB. The leakage rate was j considerably less then the capacity of one high pressure injection pump.

The health and safety of the public were not endangered by this occurrence.

i l Corrective Action:

Valve RC-2 was repacked. A leak check was satisfactorily conducted after repairs were completed.

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l 7 912110 h/7

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