ML17299A429

Special Rept:On 850526,containment Atmosphere Radiation Monitor RU-1 Particulate Channel Declared Inoperable.Caused by Misunderstanding of Channel Operation.Radiation Protection Dept Procedures Revised

ML17299A429
Person / Time
Site:	Palo Verde
Issue date:	06/25/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-32904-EEVB, NUDOCS 8507160221
Download: ML17299A429 (4)

Text

RECBVED est:

Arizona Nuclear Power Project'>II5 ip, pl, P.o. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 JUg 28 Q REGION V@E Mr. John B. Martin, Regional Administrator June 25, 1985 Office of Inspection and Enforcement ANPP-32904-EEVB/GEC U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Special Report Inoperability of Containment Atmosphere Radiation Monitor Particulate Channel Docket No. STN 50-528, License No. NPF-34 File: 85-056-026 G.l.01.10

Dear Mr. Martin:

Attached please find a Special Report prepared and submitted pursuant to Table 3.3-6 and Specification 6.9.2 of Appendix A (Technical Specifications) to the Palo Verde Nuclear Generating Station, Unit No. 1 Operating License. This report discusses the inoperability of the Particulate Channel of the Containment Radiation Monitor.

If you have any questions or concerns, please contact me.

Very truly yours, E. E. Van Brunt, Jr.

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

A.L. Hon E.A. Licitra A.C. Gehr INPO Records Center 8507i6022i

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" .~Report No. 1-8R-85-01 June 25, 1985 PALO VERDE NUCLEAR GENERATING STATION UNIT 1 SPECIAL REPORT INOPERABILITY OF CONTAINMENT ATMOSPHERE RADIATION MONITOR PARTICULATE CHANNEL Docket No.'TN 50-528 This special report is required by Palo Verde Unit 1 Technical Specification Table 3.3-6, Action 27-3.

The Containment Atmosphere Radiation Monitor (RU-1) Particulate Channel (IK) was declared inoperable on 5/26/85 at 1644. Grab samples were taken and analyzed every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to comply with Action Statement 3.4.5.1.

To comply with Technical Specification Table 3.3-6 Action 27-2, a moveable air monitor was placed in line.

The particulate channel was assumed to be operating improperly as it was indicating zero radiation on the radiation monitoring system minicomputer. This was later determined by Operations Engineering to be a misunderstanding of how this channel operates. The Operations Engineering Manager generated a letter to the managers of Operations and Radiation Protection identifying how the radiation monitor determines the activity in the containment. The Radiation Protection Department procedures were revised to incorporate this information. The Radiation Protection Department also reviewed the existing radiation monitor setpoints and determined that these setpoints had always been conservative with respect to Technical Specifications prior to the radiation monitor being declared inoperable.

The radiation monitor was proven operable in accordance with station surveillance testing requirements and was returend to operable status on June 5, 1985.