ML20153B932

Supplemental Special Rept 1-SR-85-030:on 851028,containment high-range Radiation Monitor RU-149 Inoperable in Excess of 72 H.Caused by Spurious High Radiation Alarms Coincident W/Spurious Detector Failure Alarms

ML20153B932
Person / Time
Site:	Palo Verde
Issue date:	01/23/1986
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-85-030, 1-SR-85-30, ANPP-31790-EEVB, NUDOCS 8602180199
Download: ML20153B932 (2)

Text

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/[CEfVEU j M!!0 Arizona Nuclear Power Project ;,, .,

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P.O. BOX 52034 e PHOENIX, art 2ONA 85072-2034 bd3 - I

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January R3,g,Et SCB/98.07 ANPP-3179d3E Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement U.S. Nuclear Regulatory Commissior  ;

Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368

Subject:

Palo Verde Nuclear Generating Station (PVNGS) l Unit 1 i

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

Special Report - Inoperability of Containment liigh Range Radiation Monitor (RU-149)

File: 86-020-404 I

Dear Mr. Martin:

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( Attached please find a ' Supplement to Special Report (1-SR-85-030) prepared and

! submitted pursuant to Technical Specification Table 3.3-6, ACTION 27 (Radiation Monitoring Instrumentation) and Technicc1 Specification 6.9.2. This report discusses exceeding the 72-hour ACTION statement f or the operability of the Containment liigh Range Radiation Monitor (RU-149).

If you have any questions, please contact me.

( Very truly yours

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O j E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/SGB/rw Attachments cc: R. P. Zimmerman (all w/a)

A. L. lion E. A. Licitra A. C. Gehr INPO Records Center B602180199 860 PDR ADOCK O PDR. glgI S

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Att ent to

'ANPP-31790 t PALO VERDE NUCLEAR GENERATING STATION UNIT 1 INOPERABILITY OF CONTAINMENT HIGH RANGE MONITOR (RU-149)

Docket No. STN 50-528 License No. NPF-41 i Special Report No. 1-SR-85-030 This is a supplement to Special Report 1-SR-85-030.

This Special Report is required by Palo Verde Unit 1 Technical Specification

• 3.3.3.1, Table 3.3-6, ACTION 27-3.

! On October 28, 1985, Palo Verde Unit 1 was in Mode 3 at 565 degrees F and 2250 psia when the Containment High Range Radiation Monitor, RU-149, 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 spurious high radiation alarms coincident with spurious detector failure alarms. i Emergency Plan Implementing Procedure 14A is applicable, which allows the use of external detectors Ru-158B and RU-158C, or Ru-37 and RU-38, when a containment high range monitor is inoperable.

The Radiation Monitor was placed in service on November 18, 1985 and observed for proper operation until November 21, 1985. The spurious alarms did not recur. A Channel Functional Test was performed and the monitor was declared operational on . November 21, 1985. The cause of the alarm could not be identified.

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