PNO-V-88-026, on 880418,workers Removed Flange from Pressurizer Relief Tank,Releasing Radioactive Noble Gas. Level of Activity Resulted in Containment Purge Isolation Signal.Release Caused by Inadequate Procedural Control
| ML20151Q726 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 04/19/1988 |
| From: | Mendonca M, Yuhas G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| References | |
| PNO-V-88-026, PNO-V-88-26, NUDOCS 8804270120 | |
| Download: ML20151Q726 (1) | |
$ U.
.. do' PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-88-26 Date: 4/19/88 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 Region V staff on this date.
FACILITY: Portland General Electric Company Licensee Emergency Classification Trojan Nuclear Power Plant Notification of Unusual Event Rainier, Oregon Alert Site Area Emergency General Emergency
-DOCKET N0. 50-344 X Not Applicable, REN 12051
SUBJECT:
UNPLANNED AIRBORNE RELEASE OF RADI0 ACTIVE N0BLE GAS On April 18, 1988 with the reactor in Mode 5 and the containment hatches open, workers removed a flange from the pressurizer relief tank releasing radioactive noble gas. The in-containment airborne activity and effluent radiation monitors showed increasing levels while the licensee secured the ventilation purge and evacuated workers from the containment.
Shortly thereafter, the level of airborne activity resulted in a containment purge isolation signal (ESF actuation). The licensee reports that about 4.4 curies of xenon-133 were released. This corresponds to approximately one percent of the Technical Specification limit. Seven workers were cor.taminated with xenon-133 and the maximum whole body exposure was measured by self reading dosimeter to be 14 millirem. The release was caused by inadequate procedural control / work instructions relative to removing the flange without first purging the tank.
The State of Oregon, Department of Energy, was notified.
The licensee issued a press release.
This information is current as of April 19, 1988 at 0800.
CONTACT:
G. Yuhas M. Mendonca FTS 463-3748 FTS 463-3720 DISTRIBUTION 8Y 5520:
FAX T0:
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