ML20203Q025

Special Rept 2-SR-86-008:on 860331,72 H Action Statement for Operability of Condenser Evacuation Sys high-range Radiation Monitor RU-142 Exceeded.Caused by Moisture Trapped in Process/Sample Flow Media.Moisture Trap Installed

ML20203Q025
Person / Time
Site:	Palo Verde
Issue date:	04/25/1986
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
2-SR-86-008, 2-SR-86-8, ANPP-36406-EEVB, NUDOCS 8605080538
Download: ML20203Q025 (2)

Text

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tY Arizona Nuclear Power Project P.O. BOX $2034 e PHOENIX. ARIZONA B5072-2034 gc April 25, 1986 ANPP-36406-EEVB/PGN/9%~glt,,...

t' td.h 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 - Radiation Monitoring Unit Not Restored to Operable Status Within 72 Hours File: 86-020-404

Dear Mr. Martin:

Attached please find a Special Report (2-SR-86-008) prepared and submitted pursuant to Technical Specifications 3.3.3.9 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, .

. CLAA - S E. E. Van Brunt , Jr.

Executive Vice President q Project Director EEVB/PGN/dlm Attachment cc: R. P. Zimmerman (all w/a)

A. L. Hon E. A. Licitra A. C. Gehr INPO Records Center s

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RGDI

. a PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Special Report No. 2-SR-86-008 RADIATION MONITORING UNIT NOT RESTORED TO OPERABLE STATUS WITHIN 72 HOURS 4

Docket No. STN 50-529

License No. NPF-51 This Special Report is provided pursuant to Palo Verde Unit 2 Technical Specification Table 3.3-13 ACTION 42-b, and to provide 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 1710, on March 31, 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 Condenser Evacuation System High Range Radiation Monitor (RU-142) was exceeded. The monitor was declared INOPERABLE on March 26, 1986, after spuricus high and alert radiation alarms, coincident with spurious detector failure alarms, caused RU-141 to be declared INOPERABLE. Since RU-141 supplies the sample flow to RU-142, RU-142 was also declared INOPERABLE. A work-authorizing document was issued to troubleshoot the cause of the alarms and to rework the radiation monitor as applicable.

The initiation of the Preplanned Alternate Sampling Program (PASP) of Technical Specification 6.16 may be used as a compensatory measure during the inoperability of RU-142, to monitor the appropriate parameter (s) when necessary. However, since no source term is present at this time, implementation of the PASP was not required.

The root cause of this event is believed to be moisture trapped in the process / sample flow media, causing sample flow problems from the condenser air removal system. The corrective action taken to address the root cause was to install a moisture trap in the monitor. The radiation monitor is under observation with this modification and is expected to be returned to OPERABLE status by July 15, 1986.

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