ML20072S950

Interim Part 21 Rept Re Failure of Standby Diesel Generator Fuel Nozzle Tips Mfg by Bendix.Initially Reported on 910327. on 910327 Memo Issued Requesting Recall of Affected Parts. Technical Evaluation Underway by Util

ML20072S950
Person / Time
Site:	South Texas
Issue date:	04/05/1991
From:	Stolba F COOPER BESSEMER CORP.
To:	NRC OFFICE OF ENFORCEMENT (OE)
References
REF-PT21-91 QCG-8056, NUDOCS 9104170138
Download: ML20072S950 (3)

Text

- -

3

/'

8: lr!!!!.'O' r.w,. .. ...wi. u.a.

F 1

L ?t n' W m

. 0 :4'" 3m ennn ElRM'tb. .. u. .2., C00PER April 5,1991 Our Ref: OCG 8056 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Attn: Director of Inspection and Enforcement One White Flint North 11555 Rockville Pike ,

Rockville. MD 20852

Dear Sir:

On March 27,1991, Mr. Walter Haass was notified by telephone of a 10 CFR Part 21 condition that exists at the Houston Lighting and Power South Texas Power Piant involving standby diesel /0 enerator fuel nozzle tips. The purpose of this letter is to provide written notification and a

, preliminary status report.

The Nuclear Engineering Manager of Cooper Bessemer (C B)

Reciprocating was notified by telephone of an emergency diesel generator failure on or about March 18, 1991. The failure involved Houston Lighting and Power engine DG-12 and was caused by a cracked fuel nozzle tip. The fuel nozzle tip was manufactured from material lot number 150010 and initiat investigation indicates the problem was isolated. An investigation is still in process.

On March 20,1991, the C 8 Nuclear Engineering Department was notified by H.L.& P. that DG 13 had failed. Subsequent investigation has revealed that a cracked fuel nozzle tip caused the failure. The material lot from which the fuel nozzle tip was manufactured is 150006; Bendix was the manufacturer. Eddy current examination of other fuel nozzle tips from the same material lot identified similar problems.

9104170138 910405 PDR e //8 S'

ADOcK 0500o498 l PDR T a.-

. +

t Page 2 QCG 8050 C B Reciprocating Quality Assurance determined which customers and part serial numbers were affected:

LOT NO. RO NO. CUSTOMER SERIAL NO, 150006 26913 CECO, Braidwood 7H180102 7H0515, 21,23, 26 150006 32175 HL&P 7H0519, 22,25, 27 150006 55319 HL&P 7H0503, 08, 11, 30 36 150006 58282 HL&P 7H0504 06 150006 58274 APS 7H0708 150006 59196 HL&P 7G290106 7H070107, 0914 150006 60611 APS 7H0501 02,07,09, 10, 12 14, 16 18, 20,24,28,29 On March 27, 1991 a memorandum was transmitted to Aftermarket Services requesting the recall of the affected parts. This activity is in process.

A technical evaluation is being performed by Houston Lighting and Power. C B Reciprochting Nuclear Engineering will coordinate with Houston Lighting and Power and secure the necessary technical data for the final report.

4 348. e o

__ _________________ __ _ _ _ _ _ _ bL

i e ,

Page 3 l OCG 8056 As more information relative to the scope of the problem and its root cause becomes available, we will inform you.

Sincerely,

.b$4WU$5kW F. Bruce Stolba FBS/bja ec: J. S. Baron CES/GC D. T. Blizzard CES/GC A. D. Gillette CES/GC C. E. Hallman CES/MV W. H. A. Lambert CES/GC R. L. Pettis NRC M. A. Schleigh CES/GC B. R. Sedelmyer . CES/GC P. J. Shimek CES/GC File: K 5fa19 Fuel Nozzle Tips L

L

_ __ - _ __ _ ___ _ ____.