ML20211E626

Special Rept 2-SR-86-039:on 861224,containment Bldg Atmosphere Radiation Monitor RU-1 Declared Inoperable.Cause Unknown.Work Order Issued & Troubleshooting Commenced

ML20211E626
Person / Time
Site:	Palo Verde
Issue date:	01/21/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
2-SR-86-039, 2-SR-86-39, ANPP-00133-JGH, ANPP-133-JGH, NUDOCS 8702240364
Download: ML20211E626 (2)

Text

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A Arizona Nuclear Power Project P O DOX 52034

• PHOENIX, ARIZON A 85072-2034 ANPP-00133-JGil/TDS/ Jilt-96.03 January 21, 1987 Mr. John B. Martin, Regional Administrator Of fice 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 Generat ing Station Unit 2 Docket No. STN 50-529 (License NPF-51)

Special Report 2-SR-86-039 FiIc: 86-020-404 Dea r Mr . Ma r t in :

Attached please find a Special Report 2-SR-86-039 prepared and submitted pursuant to Technical Specifications 3.3.3.1 and 6.9.2. This report discusses the inoperability of the Cont ainment Building Atmosphere Radiation Monitor for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

If you have any quest ions, please contact Tom Bradish, Compliance Supervisor at (602) 932-5300, Ext. 6936 Very truly yours.

= -

b . G. Vice llaynes President Nuclear Productlon JCil/TDS/ Jilt /c1d At t achmen t cc: O. M. DeMichele (all w/a)

E. E. Van Brunt, fr.

R. P. Zimmerman R. C. Sorenson E. A. I.ic t t ra A. C. Gehr INPO Records Center g t h tl0 0702240364 070121 PDR ADOCK 05000'129

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O PALO VERDE NUCLEAR GENERATING STATION Special Report 2-SR-86-039 Docke t No . STN-529 License No. NPF-51 At 0904 on December 24, 1986, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) operating at 100 percent reactor power when the Containment Building Atmosphere Monitor (RU-1) was declared inoperable because it would not communicate with the associated mini-computer. A moveable air monitor (RU-53) was placed in line to comply with Technical Specification Table 3.3-6 ACTION 23. Technical Specification 3.3.3.1/ Table 3.3-6 ACTION 27 requires that a special report be submitted to the NRC pursuant to Specification 6.9.2 within 30 days after the number of operable channels is less than required by the minimum channels operable requirement for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. This report is being submitted to fulfill the ACTION 27 requirement s.

A Work Order was issued and troubleshooting commenced in accordance with approved plant procedures. Troubleshooting was conducted, however the cause of the equipment communication problem was not determined. On December 27, 1986, the technicians troubleshoot ing the monitor turned RU-l of f momentarily and then turned it back on.

All indications returned to normal at this time. RU-l was left operating until December 29, 1986. No equipment communication problems were noted since the monitor had been turned back on, so at 1232 on December 29, 1986, the applicable portions of the required surveillance test were completed and RU-l was declared operable.

The root cause of the communication problem is still under investigat lon.

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