ML20090E475

AO 50-237/75-51:on 751031,torus Water Level Exceeded Tech Spec Limit During HPCI Sys Surveillance.Caused by Operator Failure to Verify Proper Valve Lineup.Water Pumped from Torus Until Level Dropped Below Tech Spec Limits

ML20090E475
Person / Time
Site:	Dresden
Issue date:	11/06/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
12981, 747-75, AO-50-237-75-51, NUDOCS 8303310671
Download: ML20090E475 (2)

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Addr:ss R: ply to: Post Othc3 Box 767 Chicago, Illinois 60600 S Ltr. 6 747-75 Dresden Nuclear Power Station R.R. #1 604508j

Morris, Illinois November 6, 1975

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Mr. James G. Keppler, Regional Director t". E

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Directorate of Regulatory Operation - Region III t

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Glen Ellyn, Illinois 60137 EFILE COPY

SUBJECT:

REPORT OF ABNORMAL OCCURRENCE PER SECTION 6.6.A 0F THE TECHNICAL SPECIFICATIONS UNIT-2 HIGd TORUS WATER LEVEL

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References:

1) Regulatory Guide 1.16 Rev. 1 Appendix A

2) Notification of Region III of U.S. Nuclear Regulatory Commission Telephone:

P. Johnson, 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br /> on November 3, 1975 Telegram:

J. Keppler, 0935 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.557675e-4 months <br /> on November 4, 1975 Report Number:

50-237/1975-51 Repor. Date: November 6, 1975 Occurrence Date: October 31, 1975 Facility:

Dresden Nuclear Power StEtion, Morris, Illinois 60450 s

IDENTIFICATION OF OCCURRENCE On October 31, 1975, the Unit-2 torus water level exceeded'the Technical Specifications limit of -1.5 inches (Tech Spec 3.7.A.l.a).

CONDITIONS PRIOR TO OCCURRENCE Unit-2 was in a steady-state condition at a power level of.2101 MUt and 693 MWe.

The High Pressure Coolant-; Injection (HPCI) system surveillance was in progress.

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DESCRIPTION OF OCCURRENCE During HPCI surveillance, the' pump discharge returns to the condensate storage tank, which also supplies pump c.ue' tion. On October 31, 1975, HPCI test line isolation valve 2301-15, which! isolates the return line to the storage tank during normal operation, was n6e opened. Minimum fle.i valve 2301-14 opened

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12981 8303310671 751106 DR ADOCK 05000237 g

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