ML19347B506

Final Deficiency Rept Re Exhaust Fan Design for Diesel Generator Fuel Oil Tank Rooms.Fan Assemblies to Be Installed Subj to Replacement W/Qualified Motors & Results of Design Verification Program

ML19347B506
Person / Time
Site:	South Texas
Issue date:	09/03/1980
From:	Oprea G HOUSTON LIGHTING & POWER CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-253, NUDOCS 8010150199
Download: ML19347B506 (5)

Text

7/ G

' The Light Company s-,iuomm mm etu , moo n,-i. rms mom ees.mn September 3,1980 ST-HL-AE-523 SF?l: V-0530 Mr. Karl Seyfrit Di rector, Region I'l Nuclear Reaulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlincton , Texas 76012

Dear Mr. Seyfrit:

South Texas Pro.iect Units 112 Docket Nos. ST?l 50 a98, ST1 50-499 '

Final Decort on the Diesel Generator Fuel Oil Tank Room Exhaust Fans On June 2.0, 1980, pursuant to 10CFR50.55(e), Houston Lignting & Power Comoany notified your office of a potentially recortable deficiency involving the exnaust fans for the diesel generator fuel oil tank rooms. The interim  ;

racort of July 16, 1980, indicated that this defic'ency is recortable, and tnat the next recort on this concern would be submitted by Sectemoer 5,1950. In resconse to that cormitment, the final recort is attacned.

If there are any cuesticns , clease contact Mr. 'iichael E. ?owell a t (713) 676-8592.

Very truly yours ,

.L0 ,[i/ h, l

<W f T.M s' /

Wj ,

Execu.ive Vice President

'1EP/ 0 L',l/ c i b Attachment 8010150/99 s

xston Lp:mg th compv3 September 3o 1980 ST-HL-AE-523 SFN: V-0530 Page 2 cc: D. G. Barker C. L. McNeese H. R. Dean R. L. Waldrop G. B. Painter A. J. Granger R. A. Frazar M. D. Schwarz (Baker & Botts)

R. Gordon Gooch (Baker & Botts)

J. R. Newman (Lowenstein, Newman, Reis, Axelrad & Toll)

Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D. C. 20555 M. L. Borchelt Executive Vice President Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range Central Power & Light Company P. O. 2121 Corpus Christi, Texas 78403 R. L. Hancock Director of Electrical Utilities City of Austin P. O. Box 1088 Austin, Texas 78767 T. H. Muehlenbeck City of Austin P. O. Box 1088 Austin, Texas 78767 J. B. Poston Assistant General Manager of Operations City Public Service Board P. O. Box 1771 San Antonio, Texas 78296 A. vonRosenberg City Public Service Board P. O. Box 1771 San Antonio, Texas 78296

baton ghtmg & r%:r Compary

;T-HL-AE- 523

' 'ag e 3 Charles Bcchoefer, Esquire Chairman, Atomic Safety & Licensing Board U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dr. James C. Lamb, III 313 Woodhaven Road Chapel Hill, North Carolina 27514 Dr. Dnmeth A. Luebke Atomic Safety & Licensing Commission U.S. Nuclear Regulatory Commission Washington, D.C.20555 Steven A. Sinkin, Esquire 116 Villita Street San Antonio, Texas 78205 Citizens for Equitable Utilities c/o Ms. Peggy Buchorn Route 1, Box 432 Brazoria, Texas 77422 Richard W. Lowerre, Esquire  !

Assistant Attorney General for the State of Texas P. O. Bcx 12548 Capitol Station Austin, Texas 78711 Henry J. McGurren, Esquire Hearing Attorney Office of the Executive Legal Director U.S. Nuclear Regulatory Commission Wash:ngton, D.C. 20555 m

Final Report Diesel Generator Fuel Oil Tank

! Room Exhaust Fans Seotember 3,1930

SUMMARY

Ouring a routine design review, a deficiency was discovered in the design of the exhaust fans for the diesel generator fuel oil tank rooms. The Diese' Generator Building (DGB) tank room exhaust fan motors are required to be Liass IE and to be supplied from a Class IE power source. The fan / motor assemblies are not i otherwise reouired to meet safety-related or seismic Category I design requirements.

1 This is a unique design situation for the South Texas Project (STP) and is the result of a plant-specific regulatory requirement imposed by the NRC during review of the Construction Pemit apolication. This deficiency was detennined to be

, recortable pursuant 10CFR50.55(e).

i DESCRIPTION OF THE INCIDENT l The interim report of July 16, 1980, identified the deficiency as being the

use of a non-Class IE power source to the fan motors. Further review has resulted in a better definition of the deficiency. Design considerations dictated

. that the motors be provided with a Class IE cower source to meet requirements of the STP Safety Evaluation Report, Supplement 1. STP design requires these motors

to be continuously energized on the Class IE power source which in turn requires qualified motors. Initial design, however, had the motor power source classified as non-Class IE. Consecuently, the motors were purchased under non-safety class specification, rather than Class IE. The basis for this deficiency is that these motors were improperly orocured as non-Class IE for loading onto the Class IE power supplies, thus violating the STP design criteria for a continuously energized fan / motor assdmbly.

CORRECTIVE ACTION i

Following identification of this deficiency, the imediate action taken was placement of a " hold" on all engineerinq drawings issued to Construction related

, to the subject fans. With the engineering " hold" instituted, field installation is procedurally disallowed. The fan / motor assemblies have been delivered to the site. This " hold" will be removed and, therefnre, installation allowed following replacement with oualified motors, which are being procured.

RECURRENCE CONTROL Because of the unique design situation related to this deficiency, as stated earlier, no general recurrence control program is considered necessary. Appropriate changes will be made to the pertinent design documents, however, to provide positive i identification of power source design requirements and Class IE qualification.

requirements for the DGB tank room exhaust fan motors. This aspect of fan motor design will also be subjected to the design verification program.

I

i 4

f Final Report 2/2 Diesel Generator Fuel Oil a Tank Room Exhaust Fans September 3, 1980 i

, ' SAFETY ANALYSIS No specific safety analysis was performed for this deficiency. Since

adherence to plant specific regulatory criteria for design of these fan / motor assemblies was not maintained, this deficiency wa3 determined to be reportable

. pursuant to 10CFR50.55(e).

1 i

i i

i l

l l

4 Y

l

.i 4

-r -- - - ,

,. ,.,i.,__-----,-c , , . - - - , . ,. ,. < , . , . - - - . - - -w--.,,.,.~.:,-w.- e , , - - --i-