ML17299A413

Special Rept:On 850426,72 H Action Statement for Inoperability of Condenser Evacuation Sys high-range Noble Gas Activity Monitor Exceeded.Caused by Failure of Associated Sample Pump.Setpoint Adjusted

ML17299A413
Person / Time
Site:	Palo Verde
Issue date:	06/05/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-32773EEVBJ, NUDOCS 8507090238
Download: ML17299A413 (4)

Text

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'NRC Arizona Nuclear Poorer Project, P.O. BOX 52034 4 PHOENIX, ARIZONA8507%584 JOIE Mr. John B. Martin, Regional Administrator June 5, 1985 Office of Inspection and Enforcement ANPP-32773EEVBJr 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 Special Report Inoperability of High Range Noble Gas Activity Monitor Docket No. STN 50-528, License No. NPF-34 File: 85-056-026 G.1.01.10

Dear Mr. Martin:

Attached please find a Special Report prepared and submitted pursuant to Table 3.3-13 (ACTION 42-b) and Specification 6.9.2 of Appendix A (Technical Specifications) 'o the Palo Verde Nuclear Generating Station, Unit No. 1 Operating License. This report discusses inoperability of t'e High Range Noble Gas Activity Moni.tor.

If you have any questions or concerns, please contact me.

Very truly yours, ZSU E. E. Van Brunt, Jr TRY Executive Vice President Project Director EEVB/GEC/)le Attachments cc: R. P. Zimmerman E. A. Licitra A. C. Gehr INPO Records Center 8@0605 Sg07090238 0~000528 P'D~

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PALO VERDE NUCLEAR GENERATING STATION UNIT 1 SPECIAL REPORT INOPERABILITY OP HIGH RANGE NOBLE GAS ACTIVITY MONITOR Docket No. STN 50-528 License No. NPP-34 This Special Report is required by Palo Verde Unit 1 Technical Specification Table 3.3-13, ACTION 42-b.

On April 26, 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 Condenser Evacuation System High Range Noble Gas Activity Monitor (RU-142) was exceeded. This monitor was declared inoperable along with the Condenser Evacuation System Low Range Noble Gas Activity Monitor (RU-141), do to failure of the associated sample pump in RU-141.

Subsequent to the sample pump being replaced on May 21, 1985, RU-142 had remained inoperable due to failure of the purge function (the purge function is utilized to verify sample flow indication in accordance with Technical Specification Table 4.3-8, Item 3e).

Technical Specification Table 3.3-13, ACTION 42-a, requires a monitoring program be initiated, upon RU-142 being declared inoperable in excess of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, when it is needed. Based upon results of the sampling program undertaken following RU-141 inoperability and subsequent data from RU-141, no additional monitoring had been deemed necessary to satisfy ACTION 42-a.

RU-142 was declared operable on May 29, 1985 following performance of the appropriate surveillance requirements. This followed a review of the surveillance procedure and an evaluation by engineering of the test features and parameters which resulted in adjustment of the purge duration set point.

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