05000346/LER-1978-025-03, /03L-0:on 780304,RCS Leakage Found Greater than 1 Gallon Per Minute.Leakage Cause Undetermined.Leakages Processed Through Normal Containment Sump.Unidentified RCS Leakage Reduced Below 1 Gallon Per Minute in 5.5-h

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/03L-0:on 780304,RCS Leakage Found Greater than 1 Gallon Per Minute.Leakage Cause Undetermined.Leakages Processed Through Normal Containment Sump.Unidentified RCS Leakage Reduced Below 1 Gallon Per Minute in 5.5-h
ML19329B931
Person / Time
Site: Davis Besse 
Issue date: 03/30/1978
From: Jerrica Johnson
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B922 List:
References
LER-78-025-03L, LER-78-25-3L, NUDOCS 8002060916
Download: ML19329B931 (2)
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LER-1978-025, /03L-0:on 780304,RCS Leakage Found Greater than 1 Gallon Per Minute.Leakage Cause Undetermined.Leakages Processed Through Normal Containment Sump.Unidentified RCS Leakage Reduced Below 1 Gallon Per Minute in 5.5-h
Event date:
Report date:
3461978025R03 - NRC Website
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8 60 61 DOCKET NUMSER 68 69 EVENT OATE 14-75 REPORT oATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h F5TTI I At 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br /> on 3/4/78. unidentified Reactor Coolant svete, (MS) le h oe m derar-l 10131 l mined from surveillance testing to be approximately 1.2 GPM.

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l o i41 I the Action Statement of Tech Spec 3.4.6.2 which requires unidentified leakage to be 1

IoIsl l less than 1 GPM while in Modes 1, 2, 3 and 4.

The unit was shutdown, per Action Statet -

! l o le ( l ment B, to Mode 3, at 0740 hours0.00856 days <br />0.206 hours <br />0.00122 weeks <br />2.8157e-4 months <br />. There was no danger to the health and safety of thel

, '. l o l 7 l l public or unit personnel. The small leakages were processed through the normal con-l

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(NP-33-78-31)

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h j

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SUPPLEMENTAL INFORMATION FOR LER NP-33-78-31 N/

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j DATE OF EVENT: March 4, 1978 [f

FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Reactor Coolant System (RCS) unidentified leakage greater.than 1 GPM i

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MRT) = 2000, and Load (MUE) = 678.

Description of Occurrence: At 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br /> en March 4, 1978, unidentified Reactor I

Coolant System leakage was determined from Surveillance Test ST 5042.02, "RCS Water Inventory Balance", to be approximately 1.2 GPM.

This placed the unit in the Action Statement of Technical Specification 3.4.6.2 which requires unidentified leakage to be less than 1 GPM in Modes 1, 2, 3 and 4.

As per Action B of Technical Specification 3.4.6.2, the unit was shutdown to Mode 3 at 0740 hours0.00856 days <br />0.206 hours <br />0.00122 weeks <br />2.8157e-4 months <br /> on March 4, 1978.

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g j Designation of Apparent Cause of Occurrence:

Due to the transients the unit went

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through which temporarily increased seal leakoff and the normal wear of the Reactor Coolant Pump seals, the seal leakoff increased to.96 GPM.

It is normal for the gap size of the seals to vary which changes the amount of seal leakoff.

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3 Analysis of Occurrence:

There was no danger to the health and safety of the public j

or to unit personnel.

The small leakages were processed through the normal contain-ment sump.

Corrective Action

The seal leakoff was measured by recording the time the leakoff filled a 400 ml cylinder. This was repeated four times for each pump.

The results for each pump seal were RCP l 0.07 GPM, RC? l 0.245 GPM, RCP 2 0.225 GPM, RCP 2 0.426 GPM.

At 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on March 4,1978, Reactor Coolant Pump seal leakoff was determined to be.96 GPM. This removed the unit from the Action Statement of Technical Specifica-tion 3.4.6.2.

Failure Data:

There have been no previous reportable occurrences of unidentified leakage caused by increased reactor coolant pump seal leakage.

('~ LER #78-025

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