ML20215N399

Special Rept 2-SR-86-030:on 860924,containment Bldg Atmosphere Particulate Channel Declared Inoperable.Computer Experienced Spurious Memory Losses.Surveillance Test Performed & Channel Returned to Svc

ML20215N399
Person / Time
Site:	Palo Verde
Issue date:	10/22/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
2-SR-86-030, 2-SR-86-30, ANPP-00108-JGH, ANPP-108-JGH, NUDOCS 8611050351
Download: ML20215N399 (2)

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Arizona Nuclear Power Project P.O Box 52034

• PHOENIX, ARIZONA 85072-2034 ANPP-00108-JGH/TDS/JHT-96.03 October 22, 1986 g U?

Mr. John B. Martin, Regional Administrator M m Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission E to

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Region V  ? g (3 1450 Maria Lane, Suite 210 -

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Walnut Cre'ek, CA 94596-5368 1 o

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 (License NPF-51)

Special Report-2-SR-86-030 File: 86-020-404

Dear Mr. Martin:

Attached please find a Special Report (2-SR-86-030) prepared and submitted pursuant to Technical Specifications 3.3-13 and 6.9 2. This report discusses the inoperability of the Containment B1111 ding Atmosphere Particulate channel.

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 Fresident Nuclear Production JGH/JHT/cld Attachment ec: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. P. Zimmerman R. C. Sorenson E. A. Licitra A. C. Gehr INP0 Records Center f611050351 R 861022 S ADOCK 05000529 PDR ,

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PALO VERDE NUCLEAR GENERATING STATION Special Report 2-SR-86-030 CONTAINMENT BUILDING ATN0 SPHERE PARTICULATE CHANNEL NOT RESIDRED WITHIN 72 HOURS.

. Docket No. 50-529~

License No. NPF-51

-This:special report is being submitted in accordance with Palo Verde Unit 2 Technical Specification Table 3.3-6, . Action 27.

At 2'210 on September 24,1986,.'Palo Verde Unit 2 was in Mode 3 (HOT ' STANDBY) when the Containment Building. Atmosphere Particulate Channel was declared inoperable 1because the channel readout was. showing no change in activity level. Initial indications were that the~ monitor's a'ssociated computer was experiencing spurious memory losses. In accordance with Action 27, a moveable air monitor was placed in line.

Troubleshooting of the monitor did'not indicate that.the computer was experiencing memory losses. Troubleshooting of the detector was then conducted. The-detector was determined;to be working satisfactorily.

The Containment. Building Atmosphere Particulate channel is a rate'of change monitor. 'Under certain steady state conditions the particulate channel readout may show little or no change . in activity level. - Since no deficiencies could be

'found, the particulate channel was returned to service af ter successful completion of the applicable surveillance test.

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The particulate channel was declared operable at 0730 on September 29, 1986.

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