ML17300A860

Special Rept 1-SR-87-017:on 870419,containment Bldg Area Radiation Monitor (RU-149) Declared Inoperable Due to Spurious Detector Failure Alarms.Cause Undetermined. Surveillance Testing Conducted & RU-149 Restored

ML17300A860
Person / Time
Site:	Palo Verde
Issue date:	05/18/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
1-SR-87-017, 192-00210-JGH-T, NUDOCS 8705270532
Download: ML17300A860 (6)

Text

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<F*CIL: BIN-50-52& Palo a Verde Nuc 1ea~ 5";=".zo! Uni t i Ar i zon- FuL

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HAYNES,J C. A-i zona Nuclear I . 'e"., Pr o Je c t ( formerly >>'-r i zone ub lic Ser~

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SUBJECT:

Special Rept l-SR-87-017: on 8rOl19> containment bldg radiation moni tor (RU-14'7> d:=c lared inoper ab l e due to spurious detector failure =la"ms. Cause undetermined.

Surveillance testing condu>.tei ';, RU-149 restored.

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Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00210-JGH/TRB/TJB May 18, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station Unit 1 Docket No. STN 50-528 (License NPF-41)

Special Report 1-SR-87-017 File: 87-020-404

Dear Sirs:

Attached please find a Special Report 1-SR-87-017 prepared and submitted pursuant to Technical Specifications 3.3.3.1 and 6.9.2. This report discusses the inoperability of the Containment Building Area Radiation Monitor for greater than 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 Tom Bradish, Compliance Supervisor at (602) 932-5300, Ext. 6936.

Very trul yours, I/g, J. G. Hayn s Vice President Nuclear Production JGH/TRB/TJB/cld Attachment cc: 0. M. DeHichele (all w/a)

E. E. Van Brunt, Jr.

J. B. Hartin R. P. Zimmerman R. C. Sorenson

. E. A. Licitra A. C. Gehr INPO Records Center 8705270532 870518 PDR ADOCK 05000528 S PDR

t 1 PALO VERDE NUCLEAR GENERATING STATION Special Report 1-SR-87-017 RADIATION MONITORING UNIT NOT RESTORED WITHIN 72 HOURS Docket No. STN 50-528 License No. NPF-41 This special report is required by Palo Verde Unit 1 Technical Specification 3.3.3.1, Table 3.3-6, Action 27 for a Radiation Monitor which was inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

At approximately 0436 MST on April 19, 1987, Palo Verde*Unit 1 was in Mode 1 (POWER OPERATION) operating at 100 percent power when a Containment Building Area Radiation Monitor (RU-149) was declared inoperable due to spurious detector failure alarms.

As required, a preplanned alternate program to monitor the appropriate parameters was initiated.

Troubleshooting to determine the cause of the alarms was commenced under an approved work order. During the course of troubleshooting, the signal cable connector at the microprocessor was cleaned however, a cause for the spurious alarms could not be determined. The radiation monitor was put back on line on April 21, 1987, but was maintained in an inoperable status to allow for additional troubleshooting and monitoring for approximately seven days. No failures or abnormalities were detected during this time period. Because of the inability to recreate the spurious alarms and the inability to isolate a particular deficiency, no root cause could be identified.

The appropriate surveillance testing was conducted an'd RU-149 was restored to an operable status on April 28, 1987 at 0875. Should RU-149 exhibit similar problems, further troubleshooting will be conducted to try and determine a root cause.

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