ML20137W054

Special Rept 1-SR-85-035:on 851227,72 H Action Statement for Operability of Containment high-range Radiation Monitor (RU-149) Exceeded.Monitor Declared Inoperable on 851224 Due to Spurious Detector Failure Alarms

ML20137W054
Person / Time
Site:	Palo Verde
Issue date:	01/23/1986
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J, Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-85-035, 1-SR-85-35, ANPP-34791-EEVB, NUDOCS 8602200049
Download: ML20137W054 (2)

Text

y

.. s .

FICEh*ED MC Arizona Nuclear Power Project P.O. BOX 52034 e PHOENIX, ARIZONA 85072-2034 ' ft 9

Januar;,p,,,}J,86ffMEFD/KLM/98.07 ANPP-34 Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License NPF-41)

Special Report - Radiation Monitoring Unit Not Restored to OPERABLE Status Within 72 Hours File: 86-020-404

Dear Mr. Martin:

Attached please find a Special Report (1-SR-85-035) prepared and submitted pursuant to Technical Specification 3.3.3.1 and 6.9.2. This report discusses a radiation monitoring unit not restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

If you have any questions, please contact me.

Very truly yours, CLL q LL(._

E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/KLM/rw Attachments cc: R. P. Zimmerman (all w/a)

A. L. Hon E. A. Licitra A. C. Gehr INPO Records Center 8602200049 860123' PDR ADOCK 05000528 9 PDR lli Is .n

Attachment to ANPP-34791 PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Special Report No. 1-SR-85-035 RADIATION MONITORING UNIT NOT RESTORED TO OPERABLE STATUS WTTHIN 72 Il0URS Docket No. STN 50-528 License No. NPF-41 This Special Report, of a Radiation Monitoring Unit not restored within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, is provided pursuant to Palo Verde Unit 1 Technical Specification Table 3.3-6 ACTION 27-3.

At 1430 on December 27, 1985, the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> ACTION STATEMENT for operability of the Containment High Range Radiation Monitor (RU-149) was exceeded. The monitor was declared inoperable on December 24, 1985, due to spurious high and alert radiation alarms coincident with spurious detector failure alarms.

A work authorizing document was issued to troubleshoot the cause of the alarms and to rework the radiation monitor as applicable.

Emergency Plan Implementing Procedure #14A, which allows the use of external detectors (RU-158 B&C or RU-37 & 38) when the containment high range monitors are inoperable, is a compensatory measure in this event.

The root cause of this event is undetermined to date. The observed detector failures have not lasted a sufficient duration to determine the actual cause of the failure.

The corrective action planned is to restore this monitor to OPERABLE by February 1, 1986. A follow-up report is projected to be submitted by March 1, 1986.

__ _ _ _.