United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9705090133



                                        150 Lincoln Avenue

                                        Grove City, PA 16127-1898

                                        Tel 412 458 8000

                                        Fax 412 458 3574



                                        Ajax [Registered copy]

                                        Coberra [Registered copy]

COOPER                                  Cooper-Bessemer [Registered copy]

ENERGY SERVICES                         Enterprise [Trademark]

                                        En-Tronic [Registered copy]

                                        Penn Trademark]

                                        Superior [Registered copy]



May 1, 1997



Our Ref: QCG-10382



Document Control Desk                   Enterprise

U.S.  Nuclear Regulatory Commission     Report #157

Washington, D.C.  20555                 Amendment 1



Dear Sir:



In accordance with the requirements of the Nuclear Regulatory Commission

Title 10, Chapter 1, Code of Federal Regulations, Part 21, Cooper Energy

Services, a division of Cooper Cameron Corporation, hereby notifies the

Commission of a re-emphasis of a previously reported potential defect in

a component of a DSRV and DSR Enterprise Standby Diesel Generator System.

There exists a potential problem with intake and exhaust power valve

springs which could result in engine non-availability.



Cooper Energy Services has supplied these parts as replacement components

to the following sites:



     UTILITY        SITE           SERIAL NO.     MODEL



LILCO          Shoreham            74010-12       DSR-48

ENTERGY        Grand Gulf          74033-36       DSRV-16-4

GULF STATES    River Bend          74039-40       DSR-48

CP&L           Shearon Harris      74046-49       DSRV-16-4

DUKE           Catawba             75010-13       DSRV-16-4

SO CAL ED      San Onofre          75041-42       SDRV-20-4

CLEVELAND ELEC Perry               75051-54       DSRV-16-4

TVA            Bellefonte          75080-83       DSRV-16-4

WPPSS          WPPSSI              75084-85       DSRV-16-4

TU ELECTRIC    Comanche Peak       76001-04       DSRV-16-4

GEORGIA POWER  Vogtle              76021-24       DSRV-16-4

TVA            Hartsville          77024-35       DSRV-16-4

SMUD           Rancho Seco         81015-16       DSR-48



Page 2

QCG-10382

May 1, 1997



The specific springs under discussion are manufactured by Associated

Spring in Corry, Pennsylvania.  They are installed as a subcomponent of

spare cylinder heads (4 springs per cylinder head) or provided as

individual spare components by Cooper Energy Services.



10 CFR 21 Report #157 was issued by Cooper Energy Services on June 19,

1991 to describe surface deficiencies found on valve springs in Cooper

Energy Services inventory.  These deficiencies, characterized by draw

marks exceeding the depth allowed by specification, were noted on springs

from a 1986 manufacturing lot.  There had been no reported failure of

valve springs in nuclear or commercial service.  Action was taken to

inspect all springs in CES inventory, enhance supplier inspection

procedures and recommend periodic inspection of all springs in service.



During the summer of 1996 a broken valve spring was found at Duke Power's

Catawba Station during a routine maintenance inspection.  No affect on

engine performance had been noted.  This spring, recently returned to CES

for analysis, was found to be of the same 1986 vintage as those

previously described in Report #157.  CES has reviewed this failure and

believes it to be an isolated case but is issuing Report #1 57 Amendment

1 to inform those affected of this failure and to re-emphasize the

recommended corrective action.



As previously reported, it is recommended that the subject springs be

inspected on a periodic basis, such as during refueling outages.  Any

springs with a visible draw mark on its I.D.  or any physical anomaly of

concern should be removed, discarded and replaced.  This inspection

should be in each plant's mechanical maintenance procedures and should be

considered to apply to all valve springs on Enterprise Engines regardless

of their original manufacturer.



It should also be noted that a correction should be made to the original

10CFR21 Report #157 wording Page 2, Para. 5 read as follows, "The number

of operating hours is of concern as the fatigue failure resulting from

such an indication should occur within approximately 740 hours (10'

operating cycles)."



A copy of this letter will be sent to all of the sites referenced in

Paragraph 2 of this letter as indicated by the copy list.



Our evaluation of this potential problem was completed on March 26, 1997.



Sincerely,



COOPER CAMERON CORPORATION



R.  M.  Cote

Vice President and General Manager



Page 3

QCG-10382

May 1, 1997



cc:  D.  T.  Blizzard - CES/GC

     J.  M.  Horne - CES/GC

     R.  G.  Billig- CES/GC

     R.  L.  Nimmo - CES/Alameda

     File: K5fa41 - Assoc. Spring Intake & Exh. Power Valve Springs



     Mr.  Walter Haass - NRC

     One White Flint North

     Mailstop 9D4

     Washington, DC 20555



     Carolina Power and Light

     Harris Nuclear Project

     P. O. Box 165, State Rd. 1134

     New Hill, NC 27562

     Attn:     William Robinson

               Vice President



     Carolina Power and Light

     P. O. Box 1551

     Raleigh, NC 27602

     Attn:  Mgr. Nuclear Licensing



     Carolina Power and Light Co.

     Harris Nuclear Project

     P. O. Box 165, State Rd. 1134

     New Hill, NC 27562

     Attn:  Dept. Manager



     Carolina Power and Light Co.

     Robinson Nuclear Project

     SC Hwy. 151 and 23, Box 790

     Hartsville, SC 29550

     Attn:  Department Manager



     Cleveland Electric Illuminating

     Perry Nuclear Power Plant

     P. O. Box 97

     Perry, OH 44081

     Attn:     Russell J. Tadych

               Manager, Quality Control



Page 4

QCG-10382

May 1, 1997



     Cleveland Electric Illuminating

     Perry Nuclear Power Plant

     P. O. Box 97

     Perry, OH 44081

     Attn:     Harold M. Coon



     Cooper-Enterprise Clearinghouse

     Duke Engineering & Service

     230 South Tryon St.

     P. O. Box 1004

     Charlotte, NC 28201-1004

     Attn: G.  A.  Harrison



     Duke Power Co.

     Nuclear Generation Dept.

     P. O. Box 1007

     Charlotte, NC 28201-1007

     Attn:     Mgr., Nuclear Safety



     Duke Power Co.

     Nuclear Generation Dept.

     P. O. Box 1007

     Charlotte, NC 28201-1007

     Attn:     W.  T.  Robertson

               V.  P.  Procurement



     Entergy

     P. O. Box 429

     Echelon One

     1340 Echelon Parkway

     Jackson, MS 39286-1995

     Attn:     F.  W.  Titus

               Vice President, Engineering



     Entergy

     P. O. Box 756

     Port Gibson, MS 39150

     Attn:     C. R. Hutchinson

               Vice Pres., Operations-GGNS



     Entergy

     P. O. Box 756

     Port Gibson, MS 39150

     Attn:     D.  L.  Pace,

               Director Design Engineering-GGNS



Page 5

QCG-10382

May 1, 1997



     Entergy

     P. O. Box 756

     Port Gibson, MS 39150

     Attn:     M. J. Meisner

               Director, NS & RA



     Manager, Quality Services

     Entergy Operations

     Box 756

     Port Gibson, MS 39150



     Southern Nuclear Operating Company

     Vogtle Project

     P. O.  Box 1295

     Birmingham, AL 35201

     Attn: Mgr., Engineering and Licensing



     Georgia Power Co.

     Plant Vogtle

     P. O.  Box 1600

     Waynesboro, GA 30830

     Attn:     Mr.  W.  B.  Shipman

               General Manager



     Gulf States Utilities

     P. O. Box 220

     St. Francisville, LA 70775

     Attn: L.  A.  England

     Director Nuclear Licensing



     Long Island Power Authority

     Shoreham Nuclear Power Station

     North Country Rd.

     Wading River, NY 11792

     Attn:     Mgr. Licensing & Regulatory

               Compliance Department



     Southern California Edison

     San Onofre Nuclear Generating Station

     P. O. Box 128

     San Clemente, CA 92672-0128

     Attn:     Manager, Nuclear Oversite Div.



Page 6

QCG-10382

May 1, 1997



     Southern California Edison

     San Onofre Nculear Generating Station

     P. O. Box 128

     San Clemente, CA 92672-0128

     Attn:     ISEG Supervisor



     Sacramento Municipal Utility Disrict

     Rancho Seco Nuclear Power Plant

     14440 Twin Cities Road

     Herald, CA 95638

     Attn:     Vice Pres. & Gen. Mgr.



     Tennessee Valley Authority

     1101 Market Street, LP 4F

     Chattanooga, TN 37402

     Attn:     Operating Experience Manager



     TU Electric - Production Division

     Group Vice President - Nuclear

     Skyway Tower

     400 North Olive Street, L.B. 81

     Dallas, TX 75201

     Attn: C.  L.  Terry



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