05000280/LER-1980-052-03, Water Entered Process Vent Sys,Filling Monitors RM-GW-101 & 102 & Health Physics Accountability Sampler.Caused by Gas Stripper Overflowing. Sys Flushed,Dried & Oiled.Vacuum Pump & Filters Replaced

Water Entered Process Vent Sys,Filling Monitors RM-GW-101 & 102 & Health Physics Accountability Sampler.Caused by Gas Stripper Overflowing. Sys Flushed,Dried & Oiled.Vacuum Pump & Filters Replaced

ML18139B192
Person / Time
Site:	Surry
Issue date:	03/19/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B191	List: 05000280/LER-1980-052, Forwards Updated LER 80-052/03X-1 05000280/LER-1980-052-03, Water Entered Process Vent Sys,Filling Monitors RM-GW-101 & 102 & Health Physics Accountability Sampler.Caused by Gas Stripper Overflowing. Sys Flushed,Dried & Oiled.Vacuum Pump & Filters Replaced
References
LER-80-052-03X, LER-80-52-3X, NUDOCS 8103240521
Download: ML18139B192 (3)

LER-1980-052, Water Entered Process Vent Sys,Filling Monitors RM-GW-101 & 102 & Health Physics Accountability Sampler.Caused by Gas Stripper Overflowing. Sys Flushed,Dried & Oiled.Vacuum Pump & Filters Replaced

Event date:
Report date:
2801980052R03 - NRC Website

text

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())!] I Low flow alarm sounded on RM-GW-101 and 102.-

Process Vent System was secured.

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!The flooding of the gas stripper caused the Process Vent System to fill with water.

CIII] !The system was flushed, dried, pump replaced.

Low flow was indicated. so system D:J1J 1was reinspected and vacuum pump replaced (Victoreen Model"841-l) and system was o::::II] ! returned to service.

A new standing order requires more stringent measures to prevenq CII!J,~ater from entering the Process.Vent System.

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UPDATED REPORT--PREVIOUS REPORT DATED 9-12-80 ATTACHMENT 1 (PAGE 1 OF 2)

SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

80-052/03X-l.

EVENT DATE:

08-12-80 TITLE OF REPORT:

PROCESS VENT SAMPLER FLOODED

1.

DESCRIPTION OF EVENT

With Unit 1 operating at a steady state power of 88%, a low flow alarm sounded on RM-GW-101 and*l02.

The Process Vent System was immediately secured and the cause of the low flow investigated.

Tech. Spec. 3.11.B.4 and 4.9.1 applies; thus,.this event is reportable in accordance with Tech. Spec. 6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The Process Vent System is monitored by RM-GW-101 and 102 plus Health Physics Accountability Sampler.

RM-101 and 102 provide a continuous readout while the H.P. Accountability Sampler provides a cumulative sample over the period of time the filters are left in.

Due to moisture damage, the H.P. Accountability Sample covering period 8/8/80 through 8/12/80 was destroyed before it could be recorded.

Since Rlf-GW-101 and 102 was functioning properly until the accident, all releases during this period were within specs.

After repair of system and replacement of vacuum pump, a low flow indication persisted.

This indicated the possibility existed for a low indication via Rl1-GW-101 and 102, thus a high (out of specs) release could occur without an alarm and the resulting automatic isolation of the system.

However, the manu-facturer indicates the current 5 cfm flow is more than sufficient for accurate operations of R}f-GW-101/102.

Thus, the health and safety of the public were not affected.

3.

CAUSE OF THE EVENT

The gas stripper overflowed and filled the Process Vent System.

4.

IMMEDIATE CORRECTIVE ACTION

Flushed, dried, and oiled system, replaced filters and vacuum pump.

System was returned to service.

5.

SUBSEQUENT.CORRECTIVE ACTION:

The low flow alarm indicated low flow.

Upon investigation, a flow of 5 cfm was found.

Performance Test 26.1 indicates a required flow of 6 cfm.

Manufacturer indicates the current 5 cfm flow is more than sufficient for accurate operation of RM-GW-101 and 102.

Written confirmation from the manufacturer that a flow rate of 5 cfm is acceptable has been received.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

A design change is being prepared which will address the prevention of water entering the Process Vent System and will provide a knock-out drain and filter housing drains.

The Engineering Review has been reviewed by the SNSOC and the final design should be completed mid 1981.

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UPDATED REPORT --PREVIOUS REPORT DATED 9-12-80 ATTACHMENT PAGE 2 of 2

7.

GENERIC IMPLICATIONS:

None.