ML20214P995

Special Rept 1-SR-86-097:on 861020,fuel Bldg Ventilation Sys high-range Monitor RU-146 Inoperable.Caused by Failure of low-range Monitor RU-145 Due to Microprocessor Lockup. Monitors Expected to Be Returned to Svc by End of Nov

ML20214P995
Person / Time
Site:	Palo Verde
Issue date:	11/18/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-86-097, 1-SR-86-97, ANPP-00119-JGH, ANPP-119-JGH, NUDOCS 8612040456
Download: ML20214P995 (3)

Text

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p , wco Arizona Nuclear Power Project P.o. BOX 52034 e PHOENIX. ARIZONA 85072-2034 ANPP-00119-JGil/TDS/JEM-96.03 November 18, 1986 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 Unit 1 Docket No. STN 50-528 (License NPF-41)

Special Report 1-SR-86-097 File: 86-020-404

Dear Mr. Martin:

Attached please find a Special Report 1-SR-86-097 prepared and submitted pursuant to Technical Specifications 3.3-13 and 6.9.2. This report discusses the inoperability of the Fuel Building 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 questions, please contact Tom Bradish, Compliance Supervisor at (602) 932-5300, Ext. 6936.

Very trul yours,

/1/ 6 5

J. G. Ilaynes Vice President Nuclear Production JGil/TDS/JEM/cid Attachment cc: O. M. DcMichele (all w/a)

E. E. Van Brunt, Jr.

R. P. Zimmerman R. C. Sorenson E. A. Licitra 4 A. C. Gehr INPO Records Center

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8612040456 861118 PDR ADOCK 05000528 '

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Mr. John B. Martin Special Report 1-SR-86-097 ANPP-00119/JGH/TDS/JEM-96.03 Page 2 bec: J. R. Bynum (all w/a)

O. J. Zeringue J. M. Allen R. E. Younger R. J. Adney R. E. Gouge _

M. L. Clyde W. E. Ide [

D. N. Stover (NSG)

J. R. LoCicero (ISEG)

M. K. Hartsig D. R. Canady LCTS Coordinator B. F. Asher (Training)

PRO File 1-86-0303 Responsible Departments (required review):

G. Voboril G. D. Perkins L. E. Brown F. T. Semper

g * ? W 3a, PALO VERDE NUCLEAR GENERATING STATION' Special Report 1-SR-86-097 RADIATION M0'NITORING LUNIT NOT RESTORED WITHIN~72 HOURS 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.

At 1130 MST on October 23, 1986, Palo Verde Unit I was in Mode 1 (POWER OPERATION) et 100 percent power, when the Fuel Building Ventilation System High Range Monitor (RU-146) had ' been 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-initially declared inoperable on October 20, 1986 as.a result of the Fuel Building Ventilation System Low Range Monitor (RU-145) experiencing a microprocessor lockup (monitor'will not count).~ Since RU-145 supplies sample flow to RU-146, the malfunction of RU-145 caused .RU-146 to be declared inoperable.

The ' Pre-Planned. Alternate Sampling Program was initiated as an interim compensatory measure as . required by Technical Specification Table 3.3-13, Action 42-A. This measure included the utilization of a portable area radiation monitor (RU-63).

Engineering and vendor personnel are continuing to troubleshoot RU-145, in accordance with approved work control documents, to determine the root cause of the microprocessor lockup. RU-145 and RU-146 are expected to be returned to service by the end of November-1986.

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