ML20214J926

RO 2-SR-86-021:on 860626,radiation Monitoring Unit Declared Inoperable on 860623 Not Restored to Operable Status within 72 H.Possibly Caused by Anomaly in Power Supply Voltage. Monitor Reset

ML20214J926
Person / Time
Site:	Palo Verde
Issue date:	07/26/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
2-SR-86-021, 2-SR-86-21, ANPP-00027-JGH, ANPP-27-JGH, NUDOCS 8608150229
Download: ML20214J926 (2)

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Arizona Nuclear Power Project P.O. Box 52034 e PHOENIX, ARIZONA 85072-2034] tg }Q ((, iO b0 July 26,1986 ANPP-00027-JGHgS[ ESP /96.03 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 2 Docket No. STN 50-529 (License NPF-51)

Special Report-2-SR-86-021 F1le: 86.020-404

Dear Mr. Martin:

Attached plence find a Special Report (2-SR-86-021) prepared and submitted pursuant to Technical Specifications 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 T. R. Bradish, Compliance Supervisor at (602)932-5300 Ext. 6936.

Very truly yours, MjfW J. G. Haynes Vice President Nuclear Production JGH/ ESP /dh Attachment cc: R. P. Zimmerman (all w/a)

A. L. Hon E. A. Licitra A. C. Gehr INP0 Records Center E. E. Van Brunt, Jr.

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o, PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Radiation Monitoring Unit Not Restored to Operable Status Within 72 Hours License No. NPF-51 Docket No. 50-529 Special Report 2-SR-86-021 This Special Report is provided pursuant to Palo Verde Unit 2 Technical Specifications 3 3 3 1, Table 3.3-6 ACTION 27, and 6.9 2 to provide l

information regarding 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 />.

At 0918 on June 26, 1986, 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 Main Steam Line Radiation Monitor (RU-139) was exceeded. The monitor was declared INOPERABLE on June 23, 1986, due to spurious detector failure alarms. The initiation of a preplanned alternate program to monitor the appropriate parameter, required by Table 3 3-6 ACTION 27, was complied with ,

by the implementation of Emergency Plan Implementing Procedure EPIP-14A (Release Rate Determination).

The monitor was reset and functionally tested in an attempt to identify the cause of the alarms. The attempt to recreate the event was unsuccessful, thereby negating the ability to identify the root cause. It is known that a spurious power supply voltage anomoly will cause this response, however, this can not be confirmed as the root cause. Based upon the satisfactory results obtained during the functional test, the monitor was returned to an OPERABLE status on June 30, 1986.

Since this event has not recurred, no further corrective action is planned at this time. Should this event be repeated, appropriate actions will be taken in an attempt to establish a pattern indicative of a root cause.

.