PNO-IV-90-026A, updates Preliminary Notification Re Inadvertent Safety Injection on 900726.Initiation of All Danger Tag Clearances Suspended Until Licensee Task Team Determines Cause of Event

PNO-IV-90-026A:updates Preliminary Notification Re Inadvertent Safety Injection on 900726.Initiation of All Danger Tag Clearances Suspended Until Licensee Task Team Determines Cause of Event

ML20055H912
Person / Time
Site:	Comanche Peak
Issue date:	07/27/1990
From:	Howell A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
References
PNO-IV-90-026A, PNO-IV-90-26A, NUDOCS 9007310122
Download: ML20055H912 (2)

N* July 27, 1990'

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• PRELIMINARY NOTIFICATION OF-EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-90-26A This preliminary notification constitutes EARLY notice of events of POSSIBLE 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.

FACILITY:-Comanche Peak Steam Electric Licensee Emergency Classification:

Station, Unit 1 X Notification of Unusual Event Glen Rose, Texas Alert Docket No. 50-445 Site Area Emergency {

General Emergency '

Not Applicable l l

SUBJECT:

NEWS MEDIA INTEREST ASSOCIATED WITH AN INADVERTENT SAFETY INJECTION This updates a preliminary notification that was issued on July 26, 1990, that documented media interest in an inadvertent safety injection that occurred at 2:16 p.m. (CDT) at Comanche Peak, Unit 1, while the plant was in hot standby. l The licensee terminated the unusual event at 5:40 p.m. on July 26, 1990, after i restoring from the safety injection.

The licensee has suspended the initiation of all danger tag clearances until a licensee task team determines the cause of the event and reviews the adequacy of 1 the danger. tag clearance process. The licensee is also reviewing the adequacy of all danger tag clearances that were initiated prior to the 2:16 p.m. safety injection. The licensee has also fonned task teams to review the effects on the plant of the transient associated with the safety injection, the emergency

. response to the event, and the adequacy of the design of the main steam isolation .

valve (MSIV) control circuitry. As of 7 a.m., on July 27, 1990, the licensee determined that it was acceptable for Unit 1 to remain in hot standby while these activities are being conducted. ,

i The resident inspectors are monitoring each of the task team activities and the region has initiated a special inspection of the design of the MSIV control circuitry. Region IV and NRR are still evaluating the need for' additional NRC response. 1 This information is current as of 10:30 a.m.

CONTACT: A. Howell, FTS 728-8180 i

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