05000334/LER-1980-100-03, /03L-0:on 801125,RCS Leakage Exceeded Tech Spec Limit.Caused by Faulty Seal Water Injection Filters & Drain Valves.Valves Replaced

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/03L-0:on 801125,RCS Leakage Exceeded Tech Spec Limit.Caused by Faulty Seal Water Injection Filters & Drain Valves.Valves Replaced
ML19340D485
Person / Time
Site: Beaver Valley
Issue date: 12/18/1980
From: Lacey W
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19340D478 List:
References
LER-80-100-03L, LER-80-100-3L, NUDOCS 8012300681
Download: ML19340D485 (2)
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LER-1980-100, /03L-0:on 801125,RCS Leakage Exceeded Tech Spec Limit.Caused by Faulty Seal Water Injection Filters & Drain Valves.Valves Replaced
Event date:
Report date:
3341980100R03 - NRC Website
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1 Attachment To LER 80-100/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 Sequence Of Events At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on November 25, 1980, with the reactor operating at about 46 percent, Operating Sutveillance Test (OST) l'.6.2, Reictor Coolant System Water Inventory Balance, was completed with a measured unidentified leakage of 1.16 gpm.

During the performance of this test, the Reactor Coolant System Tavg decreased by 2*F and pressurizer level decreased by 1.5%.

This means that the operator must use graphs to determine a correction factor, thus possibly adding error to the calculation.

At that time, the operator requested a sample of the steam generators for activity. At 1205 hours0.0139 days <br />0.335 hours <br />0.00199 weeks <br />4.585025e-4 months <br />, Chemistry personnel reported that all three steam generators were less than MDA.

At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br />, a second water inventory was completed, this time with Tavg held constant and pressurizer level decreasing by only 1%.

Unidentified leakage was calculated to be,2.29 gpm.

At 1510 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.74555e-4 months <br />, Radiation Control personnel reported that air samples taken from the Auxiliary Building 752 f t.

level revealed'the presence of Rb88 of about 27%

of MPC. At 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />, preparations for plant shutdown were initiated to comply with Technical Specification 3.4.6.2.

At 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br />, normal charging and letdown were isolated and excess letdown was placed in service in an attempt to isolate a possible leak in the charging or letdown lines.

In the meantime, an operator was sent to check the seal injection filter area with a sonic detector. The seal return filter was bypassed and isolated at 1650 hours0.0191 days <br />0.458 hours <br />0.00273 weeks <br />6.27825e-4 months <br />.

At 1725 hours0.02 days <br />0.479 hours <br />0.00285 weeks <br />6.563625e-4 months <br />, the operator at the seal injection filters reported that the sonic detector indicated leakage past the 4B filter drain valve, ICH-309. At that time, the drain piping downstream of the valve was cut and the leakage was measured, using a container, at 1.06 gpm.

Temporary tubing was then installed to direct the leakage to the auxiliary building sump.

At 1834 hours0.0212 days <br />0.509 hours <br />0.00303 weeks <br />6.97837e-4 months <br />, the RCS water inventory balance indicated an unidentified leakage of 1.4 gpm. Taking into account the measured 1.06 gpm filter leakage, the actual unidentified leakage was 0.34 gpm.

At 1840 hours0.0213 days <br />0.511 hours <br />0.00304 weeks <br />7.0012e-4 months <br />, the line downstream of the 4A seal injection filter drain valve, ICH-308, was cut and the valve was found to be leaking at a rate of approximately 50 ml/ min.

Maintenance Work Requests 802067 and 802070 were written for 1CH-309 and ICH-308, respectively.

The valves are being replaced with identical new valves.

In addition, a series valve is being installed as a backup. A design change is planned to replace these valves (no longer available) with acceptable substitutes.

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