05000321/LER-1981-036-01, /01T-0:on 810517,site Notified That Vendor Allowables for HPCI Turbine Exhaust Nozzle Would Be Exceeded During Dba.Caused by Error in Sys Design.Exhaust Pipe Supports Will Be Modified.Unit 2 Supports Being Evaluated

/01T-0:on 810517,site Notified That Vendor Allowables for HPCI Turbine Exhaust Nozzle Would Be Exceeded During Dba.Caused by Error in Sys Design.Exhaust Pipe Supports Will Be Modified.Unit 2 Supports Being Evaluated

ML20004B952
Person / Time
Site:	Hatch
Issue date:	05/27/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B946	List: 05000321/LER-1981-036, Forwards LER 81-036/01T-0 05000321/LER-1981-036-01, /01T-0:on 810517,site Notified That Vendor Allowables for HPCI Turbine Exhaust Nozzle Would Be Exceeded During Dba.Caused by Error in Sys Design.Exhaust Pipe Supports Will Be Modified.Unit 2 Supports Being Evaluated
References
LER-81-036-01T, LER-81-36-1T, NUDOCS 8106010348
Download: ML20004B952 (2)

LER-1981-036, /01T-0:on 810517,site Notified That Vendor Allowables for HPCI Turbine Exhaust Nozzle Would Be Exceeded During Dba.Caused by Error in Sys Design.Exhaust Pipe Supports Will Be Modified.Unit 2 Supports Being Evaluated

Event date:
Report date:
3211981036R01 - NRC Website

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to EVENT DATE 14 75 HEPORT DATE 50 E, VENT DESCRIPTION AND PROB ACLE CONSEQUENCES h O 2 lWith Unit 1 shutdown for a refueling / torus modification on 5-17-81, at i

10131 1 10:00, the site was notified by the AE that the vendor allowables for i

I O l i l Lth e H P C I turbine exhaust nozzle would be exceeded durina a desian bas-I IO lbi lis accident.

This is reportable under Tech Specs 6.9.1.8.i.

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IO le 1 I were no effects upon public heal th and safety due to this event.

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10171 l is a nonrepetitive occurrence.

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LER #:

50-321/1981-036 Licensee:

Georgia Power Company Facility Name:

Edwin I.

Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-036 On 5-17-81, at 10:00, with Unit 1 shutdown for the refueling /

torus modification outage, the AE notified the site that their reanalysis of as built piping as per. IEB 79-14 requirements indicated that the vendor nozzle load allowables for the HPCI turbine exhaust would be exceeded during a

design basis accident.

The cause of the change in the loads placed on the nozzle during a DBA is due to the geometry and support changes between as-designed and as-built configurations with a high degree of nozzle load sensitivity to design changes.

Subsequently, the AE issued a PDCR to modify the HPCI exhaust pipe supports

and, thereby, bring the loads seen on the exhaust nozzle during a DBA within vendor allowables.

Modif-ication to the system will be completed prior to Unit 1

startup.

The Unit 2 HPCI piping is at present being analyzed by the AE.

This event was reportable under Tech Specs 6.9.1.8.1.

There were no effects on public health and safety due to this event.

This is a nonrepetitive event.

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