ML20236T984
| ML20236T984 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 05/02/1975 |
| From: | Jennifer Davis, Gower G, Thornburg H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PN-75-016, PN-75-16, NUDOCS 9807290222 | |
| Download: ML20236T984 (1) | |
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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE l
May 2, 1975
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f" PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PN-75-16 z.
This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance.
The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 2:00 p.m.
on date of this notification.
IT SHOULD BE SPECIFICA1.LY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT IIOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENT
..WILL BE ISSUED IF WARRANn.v.
- Facility: - H. B. Robinson 2 Carolina Power and Light
Subject:
LOSS OF MAIN COOLANT PUMP SEAL The Region II office (Atlanta) was notified on May 2, 1975, that the shaft seals on Main Coolant Pump C,had failed and resulted in discharge, directly or indirectly, of approximately 100,000 gallons of primary coolant into the containment.
This is an unisolatable leak. Pressurizer level was maintained by use of the three charging pumps w)hich indicates that leakage through the seal may have reached approximately 250 gpm.
s.. _.s The reactor was at 100% power when.the seal failed. Power reduction was initiated immediately and at 36% a reactor trip occurred. The Safety
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Injection Sys' tem was operated intermittently to assure adequate water
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level in the pressurizer vessel.
The plant was brought to cold shutdown condition in the natural circulation and RHR cooling modes. All systems functioned normally throughout the event and at no time was there inadequate cooling of the reactor fuel.
There were not significant releases of radioactivity to uncontrolled areas.
A Region II inspector is being sent to the facility on 5/2/75 to t
further evaluate the occurrence.
Contact:
GCGower, IE x7261, HDThornburg, IE x7353, JGDavis, IE x7541 l
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Distribution:
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ChairmafEAnders Commissioner Mason S. J. Chilk, SECY ~
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Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE N
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Commissioner Kennedy C. C. Kammerer, CA l
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L. V. Gossick, EDO D. F. Knuth, IE J. A. Harris, PA G//
N N B. C. Rusche, NRR H. H. Brown, ISP
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K. R. Chapman, NMSS H. K. Shapar, ELD
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PRELIMINARY NOTIFICATION - NOT FOR PTTRTV DTerv ncimr i