ML20206G380

SER Supporting Employee Concern Element Rept 24300, Inadequate Diesel Generator Load Capacity Margins

ML20206G380
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
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References
NUDOCS 8811220255
Download: ML20206G380 (2)

Text

u o s a s h,,'c s UNITED STATES

!j' r., ', ' ,i NUQLEAR REGULATORY COMMISSION W ASHINGTON, D. C. 2066S

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• • • • • SAFETY EVALUATION BY THE OFFICE OF SPECIAL PROJECTS P

fjiPLOYEECONCERNELEMENTREPORT24300 1- "thADEQUATE DIESEL GENERATOR LOAD CAPACITY MARGINS

_TE,ANESSEE VALLEY AUTHORITY SE0VOYAH NUCLEAR PLANT. UNITS 1 AND 2 DOCKET NOS. 50-327 AND 328

1. SUBJECT 7 J

Category: Engineering (20,000)

Sutta tegory: Diesel Design Margins (24300) i InacequateDieselGeneratorLoadCapacityMargins(24300)

Ele: er t:  !

, Erployee Concern: XX ES-122-006,007 l WI-65-100 002

! l-85-132 SUN-01 i 4 XX-55-122-030, 031, 032 ,

W! k5-100-110

!!. INTRODUCTION The basis for Element report 24300, Revision 1, prepared January 5,19" is several employee concerns.  ;

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One concern states, "Diesel gener) tor margins are inadequate. TVA has added

• l diesel generators to Browns Ferry, Sequoyah and Watts Bar. Each time a l

question is raised, TVA must conduct another study. TVA adds diesel generators ,

I without upgrading licensing documents." Another concern states " Inadequate  !

! eanagerent of control of status listing of AC and DC electrical loads including '

diesel generator loads. This involves inadequate control of, or preparation of

! , calculations for loads, and inadequate management and control of load i

margins,includingelectricalloadsandmechanicalloads(heat,8HP,etc.)that

translate into electrical 'ioads."

• i The employee concerns raise issues regarding tne capacity of diesel generators  :

and the adequacy of all TVA electrical calculations. TVA with assistance from  :

Sargent and Luncy and Gilbert /Co nonwealth reviewed all employee concerns and I

ceterminec tr.at: L

4. Licensing documents describing the fifth diesel generator did not exist, t I

b. Docurentation of diesvl loads and margins did not exist. {

c. Electrical calculatiers were preparec informally and not maintained. (

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!!!. EVALUAi!ON NE~ and its consultant, SAIC, evaluated the capacity of the emargency diesel ger.erators (EDG) and the electrical calculations for Unit 2 an. eported its findings in section 2.3 of NUREG-1232 Volume 2.

Ey letter dated August 11, 1988 TVA submitted results of the revised calculations of ED3 loac analysis for two unit operation. The revised calculattens swi-E3-002, Revision 10 incluce all emergency diesel generators (EOG) in all operating roces for both units. The staff evaluation is included in section 2.3.2.2.1 of huREG-1232 Volume 2, Supplement 1.

IV. CONCLUSION Based on our review we conclude that the present EDG capacity is m'er"Tte for all plant operating concitions. Further, there is sufficient marg. ' tween the worst case transient and steady state loading of the EOGs and the manufacture's ratings to permit TVA to operate Unit 1 and Unit 2 at full power.

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