PNO-IV-93-016, on 930304,920228 & 0316,personnel Heard Loud Noise Which Licensee Described as Sounding Like Slamming Door.Caused by Binding of Pipe Restraints in Rcs.Region IV Will Perform Special Insp of Licensee Response to Event
| ML20036A854 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 05/11/1993 |
| From: | Johnson B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| References | |
| PNO-IV-93-016, PNO-IV-93-16, NUDOCS 9305170089 | |
| Download: ML20036A854 (1) | |
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f May 11, 1993 i
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-IV-93-016 l
t This preliminary notification constitutes EARLY notice of events of POSSIBLE l
safety-or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region IV staff on this date.
j Facility Licensee Emeroency Classification I
^ Wolf Creek Nuclear Oper. Corp.
Notification of Unusual Event
. Wolf Creek 1 Alert
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-Burlington, Kansas Site Area Emergency l
Dockets: 50-482 General Emergency X Not Applicable j
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Subject:
NOISE EVENT IN CONTAINMENT 3
At 3:07 p.m.
(CDT) with the unit in Mode 3 and leveling reactor coolant system temperature at 540 degrees Fahrenheit, a seismic monitor alarm and a-loose parts monitor alarm were received. At the same time, personnel j
inside containment heard a loud noise which the licensee described as sounding like a slamming door. The licensee stopped progressing toward j
plant startup from a refueling outage and formed a task team to evaluate the event. During the evening, system walkdowns and inspections were i
perf ormed and instrumentation data was gathered f or evaluation.
l The unit entered the current refueling outage on March 4, 1993. Similar noise events occurred on February 28 and March 16, 1992. These events i
were attributed to binding of pipe restraints in the reactor coolant j
system.
The' state of Kansas will be informed.
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Region IV received notification of this occurrence by telephone from the licensee's Vice President of Plant Operations at 3:50 p.m. Region IV has l
The licensee issued a press release at about 10 p.m. on May 10. The licensee and NRC have responded to press inquiries.
Region IV will perform a special inspection of licensee response to this l
. event. The licensee has committed to keep the plant at Mode-3 or below until the investigation of the cause of the noise event has been
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completed and the NRC staff has been briefed.
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This information has been confirmed with-a licensee representative.
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Contact:
Bill Johnson (817)860-8148
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9305170089 930511 Y
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