ML17300A751

Special Rept 1-SR-87-013:on 870130,while in Mode 5,fuel Bldg Ventilation Sys Low Range Monitor RU-145 Declared Inoperable Due to Alarms.On 870304,while in Mode 3,monitor RU-146 Declared Inoperable.No Cause Identified

ML17300A751
Person / Time
Site:	Palo Verde
Issue date:	04/01/1987
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-87-013, 1-SR-87-13, 192-00185-JGH-T, 192-185-JGH-T, NUDOCS 8704200317
Download: ML17300A751 (6)

Text

REGULATO FORMATION DISTRIBUTION M (R IDS)

ACCESSION NBR: 8704200317 DOC. D*TE: 87/00/0} NOTARI ZED: NO DOCKET FAC IL STN50528 Palo Verde Nuclear Station> Uni t 1. Ari zona Pub AFFILIATIOIN li 05000528 AUTH. NAME AUTHOR HAYNES'. G. Arizona Nuclear Pouer Prospect (former lg *rizona Public Serv RECIP. NAME RECIPIENT AFFILIATION MARTINp J. B. Reg i on 5> Office of Director

SUBJECT:

RO 1-SR-87-013: on 870130 fuel bldg vent i lati on sos high range monitor RU-145 was declared inoperable while in Mode

5. On 870304 monitor RU-}46 uas declared =inoperable while in Mode 3. No caused identif i ed.

DIBTRIBUTION CODE: IEOID COPIEB RECEIVED: LTR I ENCL t BIZE:

TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response NOTES: Standardized plant. M. Davis> NRR: }Cg. 05000528 REC I P I ENT COPIES RECIPIENT COP IES ID CODE/NAME LTTR ENCL ID CODE/NAI'IE LTTR ENCL PD5 LA 1 0 PD5 PD 1 1 LICITRA. E 1 1 DAVIS. M 1 INTERNAL: ACRS 2 2 AEOD 1 1 DEDRO 1 1 EINF L I EBERM*N 1 NRR ROE M. L 1 1 NRR/ADT 1 1 NRR/DOE* DI R 1 NRR/DREP/EPB 1 1 NRR/DREP/RPB 2 2 I'HR/DR IS DIR 1 1

/ILRB 1 CGC/HDSl 1 EQ Fi 1 1 RES SPEISi T }

RGN5 F I LE 01 1 EXTERNAL: LPDR I'.RC PDR 1 '1 NSIC NOTES:

TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL 24

Arizona Nuclear Power Project P.o, BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 192-00185-JGH/TRB/TJB April 1, 1987

-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-87-013 File: 87-020-404

Dear Mr. Martin:

Attached. please find a Special Report 1-SR-87-013 prepared and submitted pursuant to Technical Specifications 3.3.3.9 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 />.

Tf you have any questions, please contact Tom Bradish, Compliance Supervisor at (602) 932-5300, Ext. 6936.

Very'truly yours, J. G. Hay es Vice President Nuclear Production JGH/TRB/TJB/cld Attachment cc: 0. M. DeMichele (all w/a)

E. E. Van Brunt, Jr.

R. P. Zimmerman R. C. Sorenson E. A. Licitra A. C. Gehr lNPO Records Center i7 870401 05000528 FIDR ADOC g 8

l PALO VERDE NUCLEAR GENERATING STATION Special Report 1-SR-87-013 RADIATION MONITORING UNIT 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 Specifications 3.3.3.9, Table 3.3-13, ACTION 42-b and 6.9.2 for a Radiation Monitor which was inoperable for greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

The Fuel Building Ventilation System High Range Monitor (RU-146) was initially declared inoperable as 'a result of the Fuel Building Ventilation System Low Range Monitor (RU-145) being declared inoperable. RU-145 was declared inoperable due to alarms which were verified to be spurious by subsequent sampling. Since RU-145 supplies sample flow to RU-146, the malfunction of RU-145 caused RU-146 to be declared inoperable.

RU-145 was declared inoperable at 1617 MST on January 30, 1987 with Palo Verde Unit 1 in Mode 5 (COLD SHUTDOWN). However, Technical Specification Table 3.3-13 does not require that RU-145/RU-146 be operable until Mode 4 (HOT SHUTDOWN) which was entered at 1604 on March 1, 1987 following the recent outage.

At 1604 on March 4, 1987, Palo Verde Unit 1 was in Mode 3 (HOT STANDBY) when 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 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 portabl>> area radiation monitor.

Engineering personnel conducted troubleshooting of RU-145, in accordance with approved work documents, to determine the cause of the spurious alarms. No root cause could be identified. RU-145 has been monitored since entering Mode 4 and has been observed to be operating satisfactorily. Following successful completion of the appropriate Surveillance Testing, both monitors were returned to service on March 30, 1987. Should RU-145 exhibit similar problems, further troubleshooting will be conducted to try and determine a root cause.

~le J

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