05000280/LER-1980-010-01, Overstress on 18-inch Line CC-9-121,unit 2 Supply to RHR Exchanger,Found During Pipe Stress Reanalysis on Show Cause Lines.Caused by Supports Installed to Prevent Overstress During DBE

Overstress on 18-inch Line CC-9-121,unit 2 Supply to RHR Exchanger,Found During Pipe Stress Reanalysis on Show Cause Lines.Caused by Supports Installed to Prevent Overstress During DBE

ML18139B213
Person / Time
Site:	Surry
Issue date:	03/27/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B212	List: 05000280/LER-1980-010-01, Overstress on 18-inch Line CC-9-121,unit 2 Supply to RHR Exchanger,Found During Pipe Stress Reanalysis on Show Cause Lines.Caused by Supports Installed to Prevent Overstress During DBE 05000280/LER-1980-013-03, Valve HCV-1852A to Tank 1-SI-TK-1A Delayed Closing 30-50 Secs,Resulting in Tank Draining Below Tech Spec Level.Caused by Moisture in Air Lines Feeding Valve Operator.Tank Filled to Tech Spec Level 05000280/LER-1980-020-01, Heat Tracing Circuits 24A,B & C for Unit Boric Acid Filter Sys Found Tagged Out of Svc Since 800211,during Review of Penetrant Test 27B.Caused by Error During Maint on Unit 1 Drain Line 05000280/LER-1980-022-03, Snubbers 1-RC-HSS-116 & 1-RC-HSS-117 Found Out of Position During Inaccessible Snubbers Visual Insp 1-PT-39B-1.Caused by Improper Installation Due to Design Change Deficiency ML18139B211
References
LER-80-010-01X-01, LER-80-10-1X-1, NUDOCS 8104020621
Download: ML18139B213 (2)

LER-1980-010, Overstress on 18-inch Line CC-9-121,unit 2 Supply to RHR Exchanger,Found During Pipe Stress Reanalysis on Show Cause Lines.Caused by Supports Installed to Prevent Overstress During DBE

Event date:
Report date:
2801980010R01 - NRC Website

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SURRY POWER DOCKET NO:

REPORT NO:

EVENT DATE:

STATION, UNIT 1 50-280 80-010/0lX-l 01-31-80 e

TITLE OF REPORT:

EXCESSIVE STRESS ON PIPE 18"-CC-9-121

1.

DESCRIPTION OF EVENT

During progress of the pipe stress reanalysis effort, it was determined that line 18"-CC-9-121 would have been overstressed (exceeding 50 percent ultimate capacity) in the event of a Design Basis Earthquake.

The affected line feeds the Unit No.2 "A" RHR. Heat Exchanger.

This event is reportable in accordance:JWith the NRC order lifting suspension of unit operation dated August 22,1979 and Tech. Spec. 6.6.2.a.9.

2.

PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

Since the redundant train was operable and isolation capability, for the affected line was available, the health and safety of the public were not affected.

3.

CAUSE

The problem was disclosed when the architect engineer, who is conducting the pipe stress reanalysis required by the NRC Show Cause Order, discovered the overstress condition.

4.

IMMEDIATE CORRECTIVE ACTION

The overstressed condition was relieved by installing a constraint in accordance with preliminary design drawings.

5.

SUBSEQUENT CORRECTIVE ACTION:

No subsequent action is required since the overstressed :condition has been rectified.

6.

FUTURE CORRECTIVE ACTION:

None required.

7.

GENERIC IMPLICATIONS:

The reanalysis has been directed towards all Show Cause Lines.

As overstressed conditions arise*, the appropriate corrective actions are implemented.