TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401

400 Chestnut Stret Towe 11

11150--391 A342 BUD-50-34383-46 BLUD-So-39A3-41

U.S. Italewr Regulatory Cmiasioan Regio ul Attat Dr. J. U.laon Grmoe, boae ml Adtinistrator 101 Mariatta Stret, N, Site 2900 Atlanta, Georgia 30323

Dow Dr. Graoe:

rTT3 BAR NIULKAR PLAU (UBE) UNIT 2 AND 3LEPINTI NUMOLAR PLUN (8L,) UIITS 1 AuD 2 - CALCOLATIW OF SITPORT 311 LMM 01 1P7I - MBBD-50-391/83-52, B3D50J13804 3-46, BLBD-50-439A3-41 - FOOUaT XrUMRI WORT FOR ON MnIT 2 AND TOrD IrIURM 1POT POR bI 011 1 AD 2

Tlhe ubjeot defioienoy wu initially reported to NiC-Oil Impeotor P. L PFrriolmon a July 14, 1983 in aooordamne witb 10 CPR 50.55() as NC 1111 ( 8304. Our firt interin report uwas sumitted on Se3ptm r 23, 1963. Our fnal report fotar Watts Bar (11) unit 1 and soond interi report for Mi wit 2 *ad BUlefoant (IK) uniLs 1 and 2 wr sumitted on Deoaber 20, 1983. Our third interim report for n wilit 2 was uhitted on Joe 25, 1984. alosed Is our tourth interi report for Mi1 unit 2 and third inatri report

for UI uRlit 1 and 2. Ve xpeot to uimit our rnext reports on OF about June 5, 1965 and Nwok 28, 1966 for Mi uit 2 and BI mits 1 arim 2 respeotiely.

If you hae any questioa, please pt in touach ith . B. Shell at m 858-26B6.

Very truly yous,

TIB3ISMB IIA LUT AMRMITY

J . has , %nAlipr Liaensing and Regulatios

BRnl.air* oo: Nr. Jam Taylor, Direotor (bnloaurw )

Officea of Ismpotion and Enforoaant U.S. Nuoloar Regulatory Comiasion Vwhington, D.C. 2055

*eoords Center (Inolaur') Latitut of Nluolor PmWer Operationa 1100 Circleo 75 Fartlay, uLte 1500 Atlanta, OGeorgia 30339

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PBXI 6 owbe ssd~lh\

TdONLT2R *ITT BAR WrIT 2 AMD BBLLPORTB NUCLEAR PLAt 3MIITS 1 AID 2

OLCOLATIVX OF SUPORT B3SI LOAM ZN TD»E NCR caN me 830O

W10-50-39143-52, BLRDSO-.4383/S-6, BLMD-50.O43993-*1 10 PR 50.55(e)

FORTH INTERIM RPORT FOR ION UNIT 2 AND THIRD INTERIM EPORT FOR BLN UNITS I AND 2

Deoription of DefIci trno

When a piping analysis probli m requires evalation C preloading of aprinr, bellai pressau loading, and/or cold springLng, orae than onae priary sustained load uat be conasidered. The TPIR special postprooaesor ms not desaiied to process mora than ona prioy stress load caae in tha nomaal condition. Therefore, TPIPB doaes not oalaoulate aupport deusii loads oorrectly in the special postproacessor when ora than onae prioy suetained load case (load goup 1) is used in the normal condition. Sapport loads, bellao loads, and preloadad spring are incorrectly ooabined with dad loads a normal condition priry stress load cas.a. Cacaquently, support loads may have been ambined uroonsrvatively, although the pipe atrearse war calculated oorrectly.

Interim Proarea IN Pnit 2

Watts Bar unait 2 amlysis problMs affoected by this NCR have been omplated and the associated support load tablae have baeen issued. All affected support deaips are in the process of being revised.

Interim Prrasaa BLi Units 1 and 2

Six belaafonte alyuis problaas affected by this C have baeen revised and the asaocitad support load tabla have been issued. The affected aupport daesia are in the procaaess of being rvised.