ML18139B192

Updated LER 80-052/03X-1:on 800812,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: ML18139B190 ML18139B192
References
LER-80-052-03X, LER-80-52-3X, NUDOCS 8103240521
Download: ML18139B192 (3)

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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e e 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.

• • • -~--- -~

e e UPDATED REPORT --PREVIOUS REPORT DATED 9-12-80 ATTACHMENT 1 (continued)

PAGE 2 of 2

7. GENERIC IMPLICATIONS:

None.