ML20236G633

Suppls Special Rept 2-SR-86-029.On 870801,containment Bldg Atmosphere Radiation Monitor Declared Inoperable.Caused by Faulty Diaphragm in Discharge Solenoid Valve.Valve Rebuilt & Returned to Operable Status

ML20236G633
Person / Time
Site:	Palo Verde
Issue date:	10/23/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
192-00272-JGH-T, 192-272-JGH-T, 2-SR-86-029, 2-SR-86-29, NUDOCS 8711030169
Download: ML20236G633 (2)

Text

t Arizona Nuclear Power Project P.O BOX 52034 e PHOENIX, ARIZONA 85072-2034 192-00272-JGH/TRB/JEM-October 23, 1987 NRC Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station '

Unit 2.

Docket No. STN 50-529 (License NPF-51)

Supplement to Special Report 2-SR-86-029 File: 87-020-404 Attached please find a Supplement to Special Report 2-SR-86-029 prepared and submitted pursuant to Technical Specifications 3.3-6 and 6.9.2. This report discusses a radiation monitoring unit not restored to operable status within 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) 393-3531.

Very truly yours, y%y .

J. G. 'daynes Vice President Nuclear Production JGH/TRB/JEM/cld Attachment

. cc: 3. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. C. Sorenson J. R. Ball E. A. L1citra A. C. Gehr INFO Records Cent.er ph I

II 8711030169 B71023 PDR ADOCK 05000529 g PDR

__.___m_____._____ _ - - - . - - . . . - - - - - - - . - -

(

PALO VERDE NUCLEAR GENERATING STATION UNIT 2 RADIATION MONITORING UNIT NOT RESTORED TO OPERABLE STATUS WITHIN 72 HOURS Docket No. STN 50-529 License No. NPF-51 Special Report 2-SR-86-029-01 l l This is a supplement to Special Report 2-SR-86-029. l This special Report is provided pursuant to Palo Verde Unit 2 Technical Specification Table 3.3-6 ACTION 27-3, and to provide information regarding a Radiation Monitoring Unit not restored to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

At 0450 on August 1, 1986, the Containment Building Atmosphere Radiation Monitor '

(RU-1) was declared INOPERABLE when two channels (Containment Atmosphere Particulate Radioactivity Monitoring System Channel and Containment Atmosphere Gaseous Radioactivity Monitoring System Channel) did not operate within the design specification. Efforts to return the monitor to service were unsuccessful within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allocated under the action statement.

In accordance with Technical Specification 3.3-6, ACTION 27-2, a portable air monitor (RU-53) was immediately placed in service at 0525 as a compensatory measure. This monitor will satisfy the requirement to sample containment air for particulate and gaseous releases.

Troubleshooting and rework were initiated under an authorized work control document. Investigation revealed a faulty diaphragm in the discharge solenoid valve. Sample flow was being restricted as a result of the faulty diaphragm.

The valve was rebuilt in accordance with the authorized work control document  ;

and returned to OPERABLE status at 1642 on August 7, 1986. The monitor was I inoperable for 6 days, 11 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br /> and 42 minutes.

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