05000529/LER-1990-003, Revised Page 7 to LER 90-003-01

Revised Page 7 to LER 90-003-01

ML20062B952
Person / Time
Site:	Palo Verde
Issue date:	10/05/1990
From:	ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:
Shared Package
ML17305B142	List: 05000529/LER-1990-003, Revised Page 7 to LER 90-003-01 ML17305B141
References
LER-90-003-ERR, LER-90-3-ERR, NUDOCS 9010260269
Download: ML20062B952 (1)

LER-2090-003, Revised Page 7 to LER 90-003-01

Event date:
Report date:
5292090003R00 - NRC Website

text

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Palo Verde Unit 2 015 l o l o l o l 51219 910 -

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011 Ol 7 0F g l7 nxi. . - ., - - we ,seu ,,on sample system. Implementation of this change is expected by December 1990. Since this change has not been installed in the ['

unit, it did not prevent the event described in this LER.

3. LER 530/88-007 described an event where the alternate sampling system for the Condenser Vacuum Pump / Gland Seal Exhaust Radiation Monitor (RU-141) became electrically disconnected from a nearby electrical outlet and thus, rendered inoperable. As action to prevent recurrence, the involved individual was counseled, additional training was performed, and enhanced labeling for the sample cart was developed. The counseling, training, and labeling-would not have prevented the event described in this LER.

4. LER 528/89 003 described an event where the alternate sampling i system for the Fuel Building Exhaust Radiation Monitor (RU-145)  ;

became inoperable when the circuit breaker opened. As corrective action to prevent recurrence, a Design Modification was issued to supply dedicated power to the alternate sample system.

Implementation of this change is expected by December 1990. Since i this change has not been installed in the unit, it did not prevent this event. '

1 i

5. LER 529/89-005 described an event where the alternate sampling system for the Normal Plant Ventilation Radiation Monitor (RU-143) became inoperable when the circuit breaker opened due to an overload condition. As correctiva action to prevent recurrence, a Design Modification was issued to supply dedicated power to the alternate sample system. Implementation of this change is expected by December 1990. Since this change has not been installed in the unit, it did not prevent this event.

Additionally as an interim corrective action in LER 89-005..PASP equipment was to be electrically powered such that a loss of this power would provide an alarm in the control room. Preplanned bus outages during the refueling outage resulted in loss.of power to ,

several radiation monitors. In accordance with TS ACTION  !

requirements, PASP equipment was placed in service to provide alternate sampling for the monitors out of service. However, the alarm computer in the contr'1 room has limited capacity and could not accept all of the alarms. The alternate sample cart for-radiation monitor RU-145 was not connected to the alarm computer- ,

in the control room since other higher priority PASP equipment were connected instead. Therefore, this corrective action did not prevent this event.

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