ML20211J755

Special Rept 2-SR-86-031:on 861001,72 H Action Statement Exceeded for Operability of Noble Gas Activity Monitor RU-142.Monitor Declared Inoperable on 860929.Caused by burned-out Led Diode.Monitor Reworked & Returned to Svc

ML20211J755
Person / Time
Site:	Palo Verde
Issue date:	10/30/1986
From:	Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
2-SR-86-031, 2-SR-86-31, ANPP-00107-JGH, ANPP-107-JGH, NUDOCS 8611110264
Download: ML20211J755 (3)

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Arizona Nuclear Power Project 4

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/q c9 ANPP-00107-JGH/TDS/ ESP-96.03 October 30, 1986 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 (PVNGS)

Unit 2 Docket No. STN 50-529 (License NPF-51)

Special Report-2-SR-86-031 File: 86-020-404

Dear Mr.. Martin:

Attached please find a Special Report (2-SR-86-031) prepared and submitted pursuant to Technical Specifications 3.3-13 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 T. R. Bradish, Compliance Supervisor at (602)932-5300 Ext. 6936.

Very truly yours, M

J. G. Haynes Vice President Nuclear Production JGH/ ESP /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 INPO Records Center 9 8611110264 861030 I h ,'<

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Mr.' John B.' Martin

'Special Report-2-SR-86-031

'ANPP-00107-JGH/TDS/ ESP-96.03 Page 2 beet: J. R. Bynum- (all w/a)

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

J. R. LoCicero'(ISEG)

M. K. Hartsig D. R. Canady LOTS Coordinator B. F. Asher (Training)

R. E. Gduge R. R. Baron PRO File 2-86 0149 Responsible Departments (required review):

Operations Engineering (T. Phillips)

Operations Engineering (G. Viboril)

Operations Engineering (L. Henson)

Radiation Protection Radiological Chemistry (G. Perkins) Manager (L. Brown)-

Services Manager

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PALO VERDE NUCLEAR GENERATING STATION UNIT 2 Radiation Monitoring Unit Not Restored to Operable Status Within 72 Hours License No. NPF-51 Docket No. 50-529 Special Report 2-SR-86-031 This Special Report is provided pursuant to Palo Verde Unit 2 Technical Speci-fications 3.3.3.9, Table 3.3-13, ACTION 42, and 6.9.2 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 2055 on October 1, 1986, 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 Noble Gas Activity Monitor (RU-142) was exceeded. The monitor was declared INOPERABLE on September 29, 1986, due to an observed burned out LED display for the ne8ative sign on skid mounted indicator which was identified during a quarterly surveillance test. The initiation of a preplanned alternate sampling progran to monitor the appropriate parameter, required by Table 3.3-13, ACTION 42, was complied with by the implementation of Emergency Plan Implementating Procedure EPIP-14A (Release Rate Determination).

The monitor was reworked and functionally retested under approved work authorizing documents. The root cause of the burned out LED was normal component failure due to age. During the quarterly functional surveillance test, after completion of this rework, it was discovered that the 24 VDC power supply was being loaded down by the check s'ource circuit in the channel #5 detector. The root cause of this was determined to be a short circuit caused by the displacement of insulation tape on the check source wiring. Upon completion of this rework, a subsequent malfuction of the channel 1 detector was discovered, which was caused by a broken solenoid wire. The detector was replaced and calibration tested. During the calibration test two resistors were broken off when they impinged upon another circuit board. The high voltage power supply board was replaced. All noted deficiencies were reworked and the monitor was returned to service at 1015 on October 7, 1986.