ML17310A994

Suppl 2 to Special Rept 2-SR-92-004:on 921222,PASS Declared Inoperable for Greater than Seven Days Due to Failure of Containment Air Flow Indicator & Indication of Water Leakage at PASS RCS Sample Septum.Pass Declared Operable on 930105

ML17310A994
Person / Time
Site:	Palo Verde
Issue date:	01/13/1994
From:	ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:
Shared Package
ML17310A993	List: ML17310A991 ML17310A994 ML17310A995
References
2-SR-92-004, 2-SR-92-4, NUDOCS 9401280119
Download: ML17310A994 (2)

Text

PALO VERDE NUCLEAR GENERATING STATION UNIT 2 POST ACCIDENT SAMPLING SYSTEM INOPERABLE GREATER THAN SEVEN DAYS Docket No. Rh529 Ucense No. NPF<1 Special Report No. 2&R-92%0402 INITIALC NDITIONS:

This Special. Report is being submitted pursuant to Technical Specifications (TS) 3.3.3.1-ACTION 28 and TS 6.9.2 to report an event in which the Post Ardent Sampling System (PASS) was inoperable for a period greater than seven (7) days. The sevenMay period for returning PASS to service was exceeded at approximately 0830 MST on December 29, 1992.

BACKGR UND INF RMATION:

PASS is designed to sample reactor coolant and containment atmosphere under post accident conditions. The liquid sample portion of the system provides pressurized and depressurized reactor coolant samples as required for analysis. The gas sample portion of the system provides containment atmosphere samples as required for analysis.

ACTI NS TAKEN:

On December 22, 1992, Palo Verde Unit 2 was in Mode 1 (POWER OPERATION) when Control Room personnel declared PASS inoperable at approximately 0830 MST due to the failure of the containment air flow indicator and the indication of water leakage at the PASS reactor coolant system sample septum. The Preplanned Alternate Sampling Program was initiated in accordance with TS 3.3.3.1 ACTION 28.

The failures were identified during the performance of the TS monthly functional surveillance. On December 23, 1992, the containment air flow indicator was repaired and tested. On December 24, 1992, troubleshooting commenced to Identify the source of the leakage. The troubleshooting involved extensive coordination between Unit 2 Maintenance and Unit 2 Chemistry personnel to simulate system parameters and valve lineups necessary to draw the'reactor coolant system pressurized sample. The source of the leakage was difficultto Identify and the replacement of multiple valves was required in order to 'obtain a pressurized sample and declare the system operable.

I 9401280119 940113 050006~9 FOa >9~~" pod 8

Special Report 2-SR-92-004-02 On January 3, 1993, following restoration of PASS, a pressurized sample was obtained and the acceptance criteria for the monthly functional surveillance requirement was met.

The work documents were dosed on January 5, 1993.

PLANS AND SCHEDULE FOR RESTORING THE SYSTEM TO SERVICE:

Following satisfactory completion of repairs and required surveillance testing, PASS was returned to OPERABLE status at approximately 1545 MST on January 5, 1993.