ML20082Q949

Part 21 Rept Re Notifying Commission of Potential Design Defect of Ksv EDG Sys

ML20082Q949
Person / Time
Site:	Byron
Issue date:	04/21/1995
From:	Mowery J COOPER ENERGY SERVICES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-95 NUDOCS 9505010161
Download: ML20082Q949 (3)

Text

cooper Industries t

o cooperasseemer neelpreesens Produces otvision 150 Uncoln Avenue Grove City. PA 16127 1898 412 458-8000 COOPER April 21,1995 Cooper Energy Services Our Ref: OCG-10134 Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Sir:

In accordance with the requirements of the Nuclear Regulatory Commission Title 10, Chapter 1, Code of Federal Regulations, Part 21, Cooper-Bessemer Reciprocating Products Division, a division of Cooper Industriet hereby notifies the Commission of a potential design defect of the KSV emergency diesel generator (EDG) system.

There exists a potential problem with the cooling water system for the mechanical governor.

On January 29, 1995, Niagara Mohawk, Nine Mile Point Unit 2, experienced a governor failure on Division 1 EDG due to overheating of the governor.

Subsequently, the governor removed from Division ll EDG also encountered this same failure during failure mode testing at the governor manufacturer due to overheating of the mechanical governor. Further information about this failure is contained in Niagara Mohawk, Nine Mile Point, Deviation / Event Report 2-95-0192.

Testing of the failed mechanical governor at the governor manufacturer with representatives of both Niagara Mohawk and Cooper Bessemer present, revealed that the root cause of the failures was: 1] A low or no flow condition during low cooling water flow conditions, 2) Too small (3/8") and/or long water tubing runs, 3) low differential pressure across the intercoolers (the source of cooling water for the governor cooling system). The cooling system for the mechanical governor was designed and supplied by Cooper-Bessemer.

The only EDG's in service with this mechanical governor cooling design are:

UTILITY ENGINE SERIAL NO.

Niagara Mohawk 7190,7191 Commonwealth Edison - Byron Station 7169,7174,7175,7176 All other KSV-EDG's have either been previously modified or have dissimilar designs for governor cooling.

95o5o10161 95o421 PDR ADOCK 05ooo454 S

PDR cooper-sensemer+. sneerpriee*. penn. Alex*. supertor*

d0

3 fl

' OCG-10134 l

i April 20,1995 Page 2 Although immediate modification of the cooling system piping configuration has resulted in adequate cooling to the governor, the recommended long term action L

required to correct the governor oil cooling system is:

l l

Connect the oil cooler tubing to the end of the left bank engine jacket l

water inlet and outlet headers. This will control oil viscosit'/ at all operating and standby conditions.

For specific design information about this system change, please contact John M.

l Horne, Manager Nuclear and Analytical Engineering at 412-458-3543.

i l

Our investigation into this matter was completed on April 18,1995. If you have further questions concerning this report, piease contact John R. Schneider, Manager, Assurance Manager at 412-458-3434.

Sincerely, COOPER CAMERON CORPORATION

{jw J. D. Mowery Vice President and General Manager Attachment

/kil cc:

E. E. Roper - CES/GC B. R. Sedeituyer - CES/GC D. T. Blizzard - CES/GC J. M Horne - CES/GC A. D. Gillette - CES/GC J. R. Schneider - CES/GC J. A. Kinnard - CES/GC File: K5fa34 r

i L

u-

j I

QCG-10134 April 20,1995 Page 3 Copies to:

Mr. Walter Haass - NRC Mr. Dave Baran One White Flint North Byron Nuclear Power F';+ ion Mailstop 9D4 4450 North German Churc *- Rd.

. Washington, DC 20555 Bryon, IL 61010 Mr. Elmer Hemandez Commonwealth Edison co.

Byron Nuclear Power Station 4450 North German Church Rd.

Byron, IL 61010 Mr. Dave Gustafson Commonwealth Edison Co.

Braidwood Nuclear Power Station Tech Staff Electrical Shop Route 1 Box 84 Braceville, it 60407 Mr. Terry O'Brien Commonwealth Edison Co.

l 1400 Opus Place Downers Grove, IL 60515 Mr. Terry Vandevoort

[

Commonwealth Edison Co.

Zion Generating Station 101 Shiloh Blvd.

Zion, IL 60099 Ms. Kathleen Russo Niagara Mohawk Power Corp.

l Nine Mile Rd. - Unit 2 P. O. Box 63 Lycoming, NY 13093 Mr. Lenny Schiavone Niagara Mohawk Power Corp.

i 301 Plainfield Rd.

North Syracuse, NY 13212 i

Mr. Arthur Killinger MPR Associates Inc.

320 King Street j

Alexandria, VA 22314-3238 l

!