ML20210K694

Supplemental Special Rept 1-SR-85-032:on 851128,72 H Action Statement for Operability of Containment high-range Monitor RU-148 Exceeded.Caused by Intermittent Low Resistance in Detector Cable Inside Containment.Cable to Be Replaced

ML20210K694
Person / Time
Site:	Palo Verde
Issue date:	04/16/1986
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-85-032, 1-SR-85-32, ANPP-36259-EEVB, NUDOCS 8604290012
Download: ML20210K694 (2)

Text

r Arizona Nuclear Power Project P O. SOX $2034

• PHOENIX. Allt2ONA 85072-2034 April 16, 1986 ANPP-36259-EEVB/PGN/98.05 Mr. John B. Martin, Regional Administrator 6;,

Office of Inspection and Enforcement be q U.S. Nuclear Regulatory Commission G ,9@

Region V p '.g 1450 Maria Lane, Suite 210 ct - '3 Walnut Creek, CA 94596-5368  % -

Tc 3

Subject:

Palo Verde Nuclear Generating Station (PVNGS) 1 d Unit 1 @'

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

Special Report - Radiation Monitoring Unit Not Restored within 72 Hours File: 86-020-404 l

Dear Mr. Martin:

Attached please find a supplement to Special Report (1-SR-85-032) prepared and submitted pursuant to Technical Specifications 3.3.3.1 and 6.9.2. This report discusses inoperability of a containment high range radiation monitor.

If you have any questions, please contact me.

Very truly yours, 44<

E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVB/PGN/ dim Attachment cc: R. P. Zimmerman (all w/a)

A. L. Hon E. A. Licitra A. C. Gehr INPO Records Center 8604290012 860416 "

gDR ADOCK 05000528 PDR ll l IPol

Attachment to ANPP 36259 PALO VERDE NUCLEAR GENERATING STATION UNIT 1 RADIATJ.ON MONITORING UNIT NOT RESTORED TO OPERABLE WITHIN 72 HOURS Docket No. STN 50-528 License No. NPF-41 Supplement to Special Report No. 1-SR-85-032 This supplement to a Special Report is provided pursuant to ACTION 27-3 of Palo Verde Unit 1 Technical Specification Table 3.3-6 and to provide updated information regarding a Radiation Monitoring Unit not restored within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

At 2026 on Hovember 28, 1985, the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> ACTION STATEMENT for operability of the Containment High Range Monitor (RU-148) was exceeded. fr.e monitor was declared INOPERABLE at 2026 on November 25, 1985, due to a detector high voltage failure alarm. A work-authorizing document was issued to troubleshoot t the cause of the alarms and to rewcrk the radiation monitor as applicable.

Emergency Plan Inplementing Procedure #14A, which allows the use of external detectors (RU-158 B & C, RU-37 anc, 38) when the containment high range monitors (implemented 9nly in a post accident event) are INOPERABLE, may te used as a compensatory measure during inoperability of RU-148. However, no events have occurred requiring this implementation.

The root cause of this event is believed to be intermittent Iow resistance in the detector cable inside containment. The corrective action to be taken to address the root cause is repair / replacement of the detector cable. This action was originally scheduled to be completed by April 1, 1986 during the first planned outage. However, due to scheduling and parts procurement, repair has not yet been completed. The radiation monitor is expected to be returned to OPERABLE status prior to resumption of POWER OPERATION.