ML20214V703

Suppl to Special Rept 1-SR-86-069:on 860611,qualified Safety Parameter Display Sys Operated W/One Channel Less than Required & Subsequently Exceeded Tech Spec Action Statement. Actual Cause Not Determined.Addl Troubleshooting Required

ML20214V703
Person / Time
Site:	Palo Verde
Issue date:	11/19/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
1-SR-86-069-S01, 1-SR-86-69-S1, ANPP-00091-JGH, ANPP-91-JGH, NUDOCS 8612090795
Download: ML20214V703 (3)

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Arizona Nuclear Power Project 9 .

P.O. BOX 52034 e PHOENIX, ARIZONA 85072-2034 cp-ANPP-00091-JGH/TDS/ ESP-96.0'3 Y November 19, 1986 ' I'.

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i. l Mr. John B. Martin, Regional Administrator ~h 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 (PVNGS)

Unit 1 Docket No. STN 50-528 (License NPF-41)

Supplement to Special Report 1-SR-86-069 File: 86-020-404

Dear Mr. Martin:

Attached please find a supplement to Special Report (1-SR-86-069) prepared and submitted pursuant to Technical Specifications 3.3.3.6 and 6.9.2. This report clarifies the definition of channel and sensors as iterated in Technical Specification 3 3 3.6.

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

Very t ly yours, G. H Vice President Nuclear Production JGH/ ESP /cld 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 INPO Records Center 8612090795 861119 PDR S ADOCK 05000528 PDR Yl ff-6/

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Mr. John B.-Martin-1 Supplement to Special Report 1-SR-86-069

'ANPP-00078-JGH/TDS/ ESP-96.03 Page:2 bec: J. R. Bynum _. (all w/a)

0. J. Zeringue

-J. M. Allen R. E. Younger R. J. Adney M. L. Clyde W. E. Ide i D.' N. Stover (NSG)

J. R. LoCicero .(ISEG)

M. K. Hartsig D. R.,Canady LCTS Coordinator B 'F. Asher (Training)-

R. E. Gouge-W. F. Quinn F. C. Buckingham R. R. Baron PRO File 1-86-0190 Responsible Departments (required review):

Compliance Manager Compliance Supervisor

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e PALO VERDE NUCLEAR GENERATING STATION UNIT 1 One Less Than Required Channels Operab12 in Post Accident Monitoring Instrumentation License No. NPF-41 Docket No. 50-528 Supplement to Special Report 1-SR-86-069 This supplement to Special Report No. 1-SR-86-069 provides corrected information on the event of June 11, 1986, in which the Qualified Safety Parameter Display System was operated with one channel less than the required number and subsequently exceeded Action Statement 31 of Palo Verde Unit 1 Technical Specification 3.3.3.6, Table 3.3-10.

A channel is defined as 8 sensors in a probe. A channel is OPERABLE if four or more sensors, two or more in the upper four and two or more in the lower four, are OPERABLE. Technical Specification 3.3.3.6 requires four to eight sensors to be operable for the channel to be operable. The Action Statement requires that the required number of channels be restored to operability within seven days without shutting down or prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 30 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status.

On June 4, 1986, five of eight Heated Junction Thermoccuple sensors experienced intermittent inoperability and the channel was declared inoperable. This is one less than the required number of channels. Work documents were issued to troubleshoot and repair the sensors as applicable.

On June 11, 1986, the 7 day ACTION was met without restoration of the required number of channels, resulting in submittal of this Special Report.

The troubleshooting performed thus far has indicated intermittent openings in the heater circuits; however the actual root cause has not been determined. Additional troubleshooting is required; however based upon ALARA considerations is scheduled to be performed during the next refueling outage.

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