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:
Shared Package
ML20206G037	List: ML20206G034 ML20206G298 ML20206G302 ML20206G306 ML20206G315 ML20206G319 ML20206G325 ML20206G330 ML20206G337 ML20206G344 ML20206G348 ML20206G352 ML20206G358 ML20206G363 ML20206G366 ML20206G370 ML20206G374 ML20206G380 ML20206G385 ML20206G392 ML20206G396 ML20206G404 ML20206G408 ML20206G410 ML20206G416 ML20206G419 ML20206G426 ML20206G429 ML20206G435 ML20206G438 ML20206G447 ML20206G453 ML20206G457 ML20206G459 ML20206G462 ML20206G466 ML20206G472 ML20206G480 ML20206G486 ML20206G497 ML20206G502 ML20206G509 ML20206G519 ML20206G524 ML20206G529 ML20206G534 ML20206G539 ML20206G543 ML20206G550 ML20206G559 ... further results
References
NUDOCS 8811220255
Download: ML20206G380 (2)

Text

u s a s h,,'c o

UNITED STATES s

!j'

', ',i NUQLEAR REGULATORY COMMISSION r.,

W ASHINGTON, D. C. 2066S

.l

. s,;

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 Ele: er t:

InacequateDieselGeneratorLoadCapacityMargins(24300)

Erployee Concern: XX ES-122-006,007 l

WI-65-100 002 l-85-132 SUN-01 i

XX-55-122-030, 031, 032 4

W! k5-100-110 INTRODUCTION The basis for Element report 24300, Revision 1, prepared January 5,19" is several employee concerns.

l 1

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 ceterminec tr.at:

I 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.

(

f

)

i L

t p

p

+

P

[

l

!!!. 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.

i t

i i

i i

i i

f i

_.