05000280/LER-1982-104-03, /03L-0:on 820929,at Full Power,Performance of PT-24.2A Revealed That High Pressure Cardox Sys for Fuel Oil Pump Houses Inoperable.Caused by Zone Discharge Solenoid Valve Stuck Open Due to Scale & Corrosion Products

/03L-0:on 820929,at Full Power,Performance of PT-24.2A Revealed That High Pressure Cardox Sys for Fuel Oil Pump Houses Inoperable.Caused by Zone Discharge Solenoid Valve Stuck Open Due to Scale & Corrosion Products

ML20027D700
Person / Time
Site:	Surry
Issue date:	10/29/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027D699	List: 05000280/LER-1982-104-03, /03L-0:on 820929,at Full Power,Performance of PT-24.2A Revealed That High Pressure Cardox Sys for Fuel Oil Pump Houses Inoperable.Caused by Zone Discharge Solenoid Valve Stuck Open Due to Scale & Corrosion Products 05000280/LER-1982-106-03, /03L-0:on 821002,during Mode 5,w/overpressure Mitigating Sys in Enable,Both Pressurizer PORVs (PCV 1455C & 1456) Declared Inoperable.Caused by Leaking Diaphragm on PCV 1455C & Low Air Pressure on PCV 1456 Backup Air Supply ML20027D698
References
LER-82-104-03L, LER-82-104-3L, NUDOCS 8211080258
Download: ML20027D700 (2)

LER-1982-104, /03L-0:on 820929,at Full Power,Performance of PT-24.2A Revealed That High Pressure Cardox Sys for Fuel Oil Pump Houses Inoperable.Caused by Zone Discharge Solenoid Valve Stuck Open Due to Scale & Corrosion Products

Event date:
Report date:
2801982104R03 - NRC Website

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ATTACHMENT 1 SURRY POWER STATION, UNIT NO. 1 DOCKET No:

50-280

. REPORT NO:

82-104/03L-0 EVENT DATE:

09-29-82 TITLE OF THE EVENT:

INOPERABLE HIGH PRESSURE CARDOX SYSTEM 1.

DESCRIPTION OF THE EVENT:

With the unit at full power, performance of Periodic Test 24.2A (High Pressure CO2 system at the Fuel Oil Pump Houses) revealed that CO2 gas was released to both hazardous areas during a dump test designed to test only one area. The Cardox system was declared inoperable and removed from service. This event is contrary to Technical Specification 3.21.D.2(b) and is reportable in accordance with Tech. Spec. 6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMEh"f:

Operability of the High Pressure Cardox System ensures that adequate warning and fire suppression capability is available for the prompt detection and suppression of fires in order to reduce the potential for damage to safety related equipment.

With identified failure, some CO2 would have been discharged to the area experiencing a fire. When the system was declared inoperable, a fire watch and back up fire suppression equipment were immediately established and maintained until the system was returned to service.

Therefore, the health and safety of the public would not have been affected.

3.

CAUSE

The Cardox gas dumped into the wrong zone because of a failed zone solenoid valve. An accumulation of scale and corrosion products that form inside the Cardox header caused the solenoid valve to stick open.

4.

IMMEDIATE CORRECTIVE ACTION

When the system was declared inoperable, a fire watch and back up fire suppression equipment were immediately established as required by i

l T.S.3.21.A.2.9.

5.

SUBSEQUENT CORRECTIVE ACTION:

l The failed solenoid valveN was inspected, repaired and replaced.

The Cardox system was tested as per PT 24.2A and returned to service within the time span specified in Tech. Spec. section 3.21.A.2.b.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The operability of the high pressure Cardox System will be evaluated with respect to corrosion.

l 7.

GENERIC IMPLICATIONS:

None.

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