ML20215K762

Special Rept 1-SR-86-089:on 860911 & 14,fuel Bldg Ventilation Sys high-range Monitor Ru-146 Declared Inoperable for More than 72 H.Caused by Inoperable Monitor Ru-145 on 860911 Due to Spurious Indications

ML20215K762
Person / Time
Site:	Palo Verde
Issue date:	10/13/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR, MISSISSIPPI POWER & LIGHT CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-86-089, 1-SR-86-89, ANPP-00100-JGH, ANPP-100-JGH, NUDOCS 8610280294
Download: ML20215K762 (3)

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v b O Arizona Nuclear Power Project P o. box 52034 e PHOENIX. ARI2oNA 85072-2034 October 13, 1986 ANPP-00100-JGH/TDS/TJB-96.03 Mr. John B. Martin, Regional Administrator Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 0 Walnut Creek, CA 94596-5368 'y' 5;

Subject:

Palo Verde Nuclear Generating Station (PVNGS) U C U3 Unit 1 5 ,,

"MC Docket No. STN 50-528 (License NPF-41) .r, C

Spe cial' Report- SR-86-089 File: 86-020-404 o c-

Dear Mr. Martin:

4 Attached please find a Special Report (1-SR-86-089) prepared and submitted pursuant to T3chnical Specifications 3.3-13 and 6.9.2. This report discusses the inoperabielty of the Fuel Building Radietion 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 T. R. Bradish, Compliance Supervisor at (602)932-5300 Ext. 6936.

Very truly yours, J. G. Haynes Vice President Nuclear Production JGH/TJB/cid 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 8610280294 h hpgg 28 M ADOCK PDR s

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, V Mr. John B. Martin Special Report-1-SR-86-089 ANPP-00100-JGH/TDS/TJB/96.03 Page 2 bec: J. R. Bynum (all w/a)

O. J. Zeringue J. M. Allen R. E. Younger R. J. Adney 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)

R. E. Gouge R. R. Baron PRO File Responsible Departments (requir94 review):

G. D. Perkins G. K. Vobori.1

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~ 73 Ox PALO VERDE NUCLEAR GENERATING STATION Special Report 1-SR-86-089 RADIATION MONITORING UNIT NOT RESTORED WITHIN 72 HOURS Docket Not. 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 1540 MST on September 14, 1986, Palo Verde Unit 1 was in Mode 1 (POWER OPERATION) at 100 percent reactor 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 September 11, 1986. RU-146 was declared inoperable as a result of the inoperability of the Fuel Building Ventilation System Low Range Monitor (RU-145). The design of the system is such that if RU-145 is inoperable, then RU-146 may also be inoperable. The dependency is caused because RU-145 supplies sample flow to RU-146.

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).

RU-145 was declared inoperable on September 11, 1986 due to spurious indications of high radiation. These indications were verified to be false by results schieved through alternate sampling techniques. Although troubleshooting activities were initiated to return RU-145 to service, the root cause could not be identified and corrected within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The root cause of the spurious indications from RU-145 has not been identified and an engineering investigation is currently in progress to evaluate this concern.

The spurious indications have not been recurring and RU-146 was returned to service on October 7, 1986 upon the successful completion of the appropriate surveillance test.