ML20203N257

Suppl 2 to Special Rept 1-SR-85-018:on 850925,condenser Evacuation Sys high-range Monitor RU-142 Inoperable for More than 72 H Due to Failure in low-range Monitor RU-141.New Isolated Grounding Sys Will Be Installed After 860601

ML20203N257
Person / Time
Site:	Palo Verde
Issue date:	09/10/1986
From:	Haynes J 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-00065-JGH, ANPP-65-JGH, NUDOCS 8609230251
Download: ML20203N257 (2)

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• Arizona Nuclear Power Project P.o. Box 52034

• PHOENIX, ARIZONA 85072-2034 September 10, 1986 _,

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Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement 35, 'A t9 U.S. Nuclear Regulatory Commission Q-Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 (License NPF-41)

Special Report-1-SR-85-018 File: 86-020-404

Dear Mr. Martin:

The attached supplement 0 2 to Special Report (1-SR-85-018) is submitted to provide additional information subject to the requirements of Technical Specification Table 3 3-13 (Radioactive Gaseous Effluent Monitoring Instrumentation) and Specification 6.9.2. This report discusses 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 T. R. Bradish, Compliance Supervisor at (602)932-5300 Ext. 6936.

Very truly yours, J. G. Haynes Vice President Nuclear Production JGH/JEM/dh Attachment ec: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. P. Zimmerman A. L. Hon E. A. Licitra g((p , g A. C. Gehr INPO Records Center -

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eu PALO VERDE NUCLEAR GENERATING STATION UNIT.1 Special Report 1-SR-85-018 Docket No. STN 50-528

-License No. NPF-41 This is a supplement tx) Special Report 1-SR-85-018.

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 />. The monitor was declared inoperable due to the Condenser Evacuation 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.

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 Design Change Package (DCP)(No. 10E-SQ-049) has been approved for installing a new isolated grounding system for the Radiation Monitoring System. This modification is currently scheduled to be completed during the first system outage of sufficient duration after June 1,1986.

DCP No. 10E-SQ-053 has been initiated to separate the high range monitors from the low range monitors. This modification is presently scheduled to be completed during the refueling outage in March 1987.

Condenser Evacuation System High Range Monitor RU-142 was returned to operable status December 9, 1985.

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