ML17299A709

Special Rept 1-SR-85-018:on 850925,condenser Evacuation Sys High Range Monitor RU-142 Inoperable for More than 72 H. Caused by Random Loss of Stored Data.Schedule Being Developed to Resolve Problem

ML17299A709
Person / Time
Site:	Palo Verde
Issue date:	10/25/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-85-018, 1-SR-85-18, ANPP-33833-EEVB, NUDOCS 8511050122
Download: ML17299A709 (4)

Text

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'RECBPEO Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX. ARIZONA85072-2034 1985 OCT 29 AN 10:OS October 25, 1985 ANPP-33833-EEVB/GEC REGION V l8F.

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 Special Report Exceeding Action Statement for Operability of the High Range Noble Gas Activity Monitor File: 85-056-026'.1.01.10

Dear Mr. Martin:

Attached please find a Special Report (1-SR-85-018) prepared and submitted pursuant to Specification Table 3.3-13 (Radioactive Gaseous Effluent Monitoring Instrumentation) and Specification 6.9.2 of PVNGS Technical Specifications. This repoit discusses exceeding the 72-hour ACTION statement for the operability of the High Range Noble Gas Activity Monitor (RU-142).

If you have any questions, please contact me.

Very truly yours, E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/GEC/ds Attachments CC: R. P. Zimmerman (all w/a)

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

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PALO VERDE NUCLEAR GENERATING STATION UNIT 1 Special Report 1-SR-85-018 Docket No. STN 50-528 License No. NPF-41 This Special Report is required by Palo Verde Unit 1 Technical Specification Table 3.3-13, ACTION 42-b.

On September 25, 1985, Palo Verde Unit 1 was in Mode 1 at 60 percent reactor power when the Condenser Evacuation System High Range Monitor (RU-142) was inoperable for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This monitor was declared inoperable due to the Condenser Evacuation System Low Range Monitor (RU-141) being declared inoperable due to random loss of stored data.

The design of the system is such that, if the low range monitor is inoperable, the high range monitor is also inoperable.

RU-142 remained inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> due to troubleshooting on RU-141. Operations Engineering is continuing an investigation to determine the cause of the random loss of stored data from RU-141.

Actions taken for RU-141 in accordance with Technical Specification Table 3.3-13 have determined that implementation of ACTION 42(a) for RU-142 has not been necessary.

A schedule is currently being developed to resolve the RU-141 loss of stored data condition and restore both RU-141 and RU-142 to operable status. A supplement to this Special Report, including a schedule for RU-142 restoration, will be submitted in 30 days.