ML18139B213

Updated LER 80-010/01X-1:on 800131,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: ML18139B211 ML18139B213 ML18139B214 ML18139B215 ML18139B216
References
LER-80-010-01X-01, LER-80-10-1X-1, NUDOCS 8104020621
Download: ML18139B213 (2)

Text

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[II§] JStress calculations revealed that the installed supports would riot prevent an oyer-o::::o:::J 1stressed condition on the affected line during a Design Basis Earthguake. Modifics1,tjorl o:II] !was initiated in accordance with preliminary design drawings and completed priori~ to

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e SURRY POWER STATION, UNIT 1 DOCKET NO: 50-280 REPORT NO: 80-010/0lX-l EVENT DATE: 01-31-80 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.