05000321/LER-1981-032-01, /01T-0:on 810514,during Refueling & Torus Mod Shutdown,Site Notified by A/E That Vendor Load Allowables Would Be Exceeded on Steam Nozzles During Dba.Caused by Design Error in Sys Pipe Supports.Mods Planned

/01T-0:on 810514,during Refueling & Torus Mod Shutdown,Site Notified by A/E That Vendor Load Allowables Would Be Exceeded on Steam Nozzles During Dba.Caused by Design Error in Sys Pipe Supports.Mods Planned

ML20004C057
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
ML20004C053	List: 05000321/LER-1981-032, Forwards LER 81-032/01T-0 05000321/LER-1981-032-01, /01T-0:on 810514,during Refueling & Torus Mod Shutdown,Site Notified by A/E That Vendor Load Allowables Would Be Exceeded on Steam Nozzles During Dba.Caused by Design Error in Sys Pipe Supports.Mods Planned
References
LER-81-032-01T, LER-81-32-1T, NUDOCS 8106010470
Download: ML20004C057 (2)

LER-1981-032, /01T-0:on 810514,during Refueling & Torus Mod Shutdown,Site Notified by A/E That Vendor Load Allowables Would Be Exceeded on Steam Nozzles During Dba.Caused by Design Error in Sys Pipe Supports.Mods Planned

Event date:
Report date:
3211981032R01 - NRC Website

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. ITITl [W i t h U n tt._1 s i utd.py n for refuelina/ torus modification on 5-14-n1,_at

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110:00 the site was notified by. the AE that the vendor load allowables I

O a i La.J 4 ) t w o u l d b e e x c e e d e d o n t h e R C I C s t e a m n o z z l e s d u r i n a a _ d c3_1gn__h_as i s a c c i d - l lent and the CRD hydraulic line supports do not satisfy design require-I j

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!L(Ll1]Iments.

These are re_p o r t a b l e turd e r T e ch Sne c s s e c t io n G.,9.1. a. i.

There l i [0.17l [uere no effects upon public health and safety due 'o this event.

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!Iolajlis a nonrepetitive event for these nozzles and CRD lines.

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CAUSE DE.9CHIPTION AND COHHECTIVE ACTIONS 27

! 1:101IThe cause of the event was error in the design of the sys tems pipe sun-l Is lil lyorts by the AE.

flo di fi ca t i ons to the pipe supports on both systems i

1 lil2l lwill satis fy the design requirements.

Unit 2 RCIC supports were mod-l Iia lified during the last refueling outage, and the analysis of the CRD i

[ system shows no deficiencies. i4cdification will be complete before startup.

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LER #:

50-321/1981-032 A

Licensee:

Georgia Power Company Facility Name:

Edwin I.

Ilatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-032 On 5-14-81, 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 IED 79-14 requirements indicated that during a design basis accident the ratio of actual to vendor allowable loads are 5.41 inlet and 2.15 exhaust.

Both of these ration are higher than the current

" Analysis of Record" values of 2.645 inltt and 1.769 exhaust.

The cause of the increase in the ratios is due to the geometry and support changes between as-built and as-designed configur-ations with a high degree of nozzle load sensitivity to design changes.

A dye penetrant test was performed on the RCIC turbine nozzleu, and the results were acceptable.

Subsequently, the AE issued a PDCR to modify the RCIC steam supply and exhaust pipe routing and RCIC pipe supports.

These changes will bring the loads on the nozzles during a DBA with-in vendor allouables.

Modification of the system will be completed before Unit 1 startup.

Unit 2 RCIC pipe supports were modified during the past Unit 2 refueling outage to the loads within vendor allowables for DBA conditions.

Also on 5-14-81, at 10:00, Bechtel Power Corporation informed Plant Hatch that as a result of a piping support walkdown conducted as a result of IEB 79-14, many control rod drive (CRD) hydraulic line supports were found to not satisfy design requirements.

All affected CRD piping supports have been analyzed and modifications to these CRD supports have begun.

The supports that need to be modified will be modified before Unit 1 startup.

This event was reportable under Tech Specs 6.9.1.8.2.

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

This is a nonrepetitive event for these RCIC nozzled and CRD lines.

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