ML20235V369

Confirms NRC Understanding of Util Monitoring Program to Detect Erosion/Corrosion Caused by Wall Thinning of Pipe Walls at Facility.Proposed Corrective Actions Acceptable Pending Verification Prior to Resumption of Plant Operation

ML20235V369
Person / Time
Site:	Wolf Creek
Issue date:	10/02/1987
From:	Calvo J Office of Nuclear Reactor Regulation
To:	Withers B WOLF CREEK NUCLEAR OPERATING CORP.
References
NUDOCS 8710150109
Download: ML20235V369 (4)

Text

k4 Docket No.:

50-482' October 2, 1987 1

Mr. Bart D. Withers 1

President and Chief Executive Officer Wolf. Creek Nuclear Operating Corporation Post Office Box 411 Burlington, Kansas 66839

SUBJECT:

CORRECTIVE ACTIONS RELATED TO EROSION / CORROSION PIPE THINNING TO BE COMPLETED DURING THE 1987 REFUELING OUTAGE This letter confirms the NRC staff's understanding of the Wolf Creek Nuclear Operating Corporation's (WCN00) monitoring program to detect erosion / corrosion caused wall thinning of pipe walls at the Wolf Creek Generating Station.

Your-i program and the corrective measures that are to be accomplished during your i

upcoming refueling outage were discussed with Gary Boyer, Plant Manager for Wolf Creek during a September 11 telephone conference with Region IV personnel i

and the Resident Inspectors.

/

We expect that before returning to operation following your 1987. refueling 1

outage you will complete your ultrasonic inspection of all safety-related l

piping locations having a high probability of erosion / corrosion damage.

We

{

also expect that you will replace the seven areas where piping has experienced i

through wall or below minimum wall thinning with stainless steel components during the 1987 refueling outage and will repair or replace all components that are projected to erode / corrode to le'ss than minimum wall thickness during the third fuel cycle.

d The, staff considers your proposed corrective actions acceptable pending verifi-cation prior to resumption of plant operation.

We expect that you will provide.

for NRC review by November ~30, 1987, a plan and schedule for corrective measures that will eliminate erosion / corrosion related pipe thinning caused by flow disturbances in piping systems as a result of butterfly valve throttling and piping configurations at Wolf Creek.

J Sincerely, Jose A. Calvo, Director h710150109 071%0 ectorak - W 02 ADOCK 050 PDR Division of Reactor Projects - III, DR p

IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page i

DISTRIBUTION J

Docketdile NRC POR Local POR PD4 Reading F. Schroeder P. Noonan P. O'Connor J. Calvo OGC-Bethesda E. Jordan J. Partlow ACRS (10)

PD4 Plant File T. Murley R. Starostecki F. Miraglia R. Martin G. Hnlahan F. Schroeder D. Crutchfield

• See previous concurrences:

PD4/LA*

PD4/PM p

EMEB*

RIV PD4/0*

P0'Connof:pfR sr CYCheng JGagliardo JCalvo PNoonan 9/24/87 10/;L/87 10/01/87 10/01/87 10/g@/8 ma w 4 co% H& p Y

v. w w

s

.1 Do ket No".:

50-482

'l u

4 Mr,'!Bart D. Withers-I W

LPresident and. Chief Executive Officer Wolf Creek Nuclear Operating' Corporation p

-Post Office Box 411 '

Burlington; Kansas.'66839~

P

SUBJECT:

. CORRECTIVE ACTIONS'RELATED TO EROSION / CORROSION PIPE' THINNING

'TO BE COMPLETED DURING'THE 1987 REFUELING OUTAGE:

'A.

This letter confirms _ the NRCl staff's understanding of the Wolf Creek Nuclear Operating Corporation's.(WCN00) monitoring program to detect. erosion / corrosion' l

caused wa11' thinning of pipe walls at.the Wolf Creek Generating Station; Your.;

~

t program and the corrective measures that are.to be accomplished during your'

. upcoming refueling outage were discussed with Gary'Boyer, Plant Manager for

-Wolf Creek during a September 11' telephone ' conference with Region = IV personnel and the Resident Inspectors.

We expect that before returning to operation following'your.1987Lrefueling outage,you will complete your ultrasonic inspection ~of all safety-related r._

piping locations.having a high probability of erosion / corrosion damage. -We:

also. expect that you will replace the seven areas where piping ~has experienced

through wall or below minimum wall thinning with stainless' steel components during the 1987 refueling outage and will. repair or replaceLall components that' are' projected to' erode / corrode.to'less than minimum wall thickness during the third fuel cycle.

The staff considers your proposed corrective actions acceptable pending verifi-cation prior to resumption of plant operation.

We expect that you will provide for NRC review by November 30, 1987, a plan and schedule for. corrective measures that will eliminate erosion / corrosion related pipe thinning. caused by butterfly valve throttling of flow in. piping systems at Wolf Creek.

Sincerely, Jose A Calvo, Director -

Project Directorate - IV Division of Reactor Projects

-III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next.page DISTRIBUTION Docket File NRC PDR Local PDR PD4 Reading F;~.Schroeder P. Noonan P. 0'Connor J. Calvo OGC-Bethesda E. Jordan J. Partlow ACRS (10)

PD4 Plant ~ File T. Murley R. Starostecki F. Miraglia R. Martin G. Holahan F. Schroeder D. Crutchfield

• See previous concurrences:

PD4/LA*

PD4/PM*

EMEB*

RIV PD4/D ///C PNoonan.

PO' Connor: sr CYCheng JGagliardo JCalvo 9/24/87 9/30/87 10/01/87 9/ /87

/S/ / /87

4

.i r

Docket No.

^50-482-

)

3-

, s 3

1 m

Mr. 'Bart Di Withers..

Presidentiand Chief Executive Officer-

-J

Wolf' Creek Nuclear.0perating Corporation i

Post Office: Box =411'.

Burlington, Kansas 66839

Dear Mrf Withers:

"I

. l

SUBJECT:

CORRECTIVE ACTIONS RELATED TO EROSION / CORR 0SION' PIPE THINNING-1 TO BE' COMPLETED DURING THE 1987 REFUELING OUTAGE J

This letter cerifirms the NRC staff's understanding-of the Wolf Creek Nuclear t

Operating: Corporation's (WCNOC) monitoring' program to detect erosion / corrosion j

caused wall.' thinning.of pipe walls at the Wolf Creek Generating Sta. tion; Your.:

program and the. corrective measures that are to-be accomplished during your tz l

. upcoming refueling: outage were' discussed with Gary Boyer, Plant Manager for-

. Wolf Creek during'a : September 11 telephone conference with Region'.IV personnel, and the Resident Inspectors, j

i

We. expect thatibefore-returning to' operation following your 1987 refueling

outage'you will complete your ultrasonic inspection of all safety-related-piping. locations having a high probability of erosion / corrosion damage.

We..

also' expect that you 'will replace the seven areas where. piping.has experienced through wall or below minimum wall thinning by stainless steel components

during the 1987 refueling outage and will repair!or replace all components that are projected ~ to erode / corrode to le'ss than minimum wall thickness during the third fuel cycle.

The; staff considers your proposed corrective actions acceptable pending verifi-cation prior.to resumption of plant operation.

We expect that you will provide for'NRC review oy November 30, 1987, a plan and schedule for corrective measures that will eliminate erosion / corrosion related pipe thinning caused by butterfly valve throttling of f?ow in piping systems at Wolf Creek.

t Sincerely, I

Jose A. Calvo, Director j

Project Directorate - IV

)

Division of Reactor Projects - III, IV, V and Special Projects-I Office of Nuclear Reactor Regulation cc:: See next page DISTRIBUTION ~

Docket File NRC POR Local PDR PD4 Reading F Schroeder P. Noonan P. O'Connor J. Calvo

-OGC-Bethesda E. Jordan J. Partlow ACRS (10)

.PD4~ Plant File T. Murley R. Starostecki F. Miraglia R. Martin G. Holahan F. Schroeder D. Crutchfield l:

PD4/L PD4/PM kk RIV PD4/D L PNoon if P0'Connor:sr CYCheng JGagliardo JCalvo 9p/8 9/ 0/87 (97

/87 9/ /87 9/ /87 3

i

~ _ _ _

____E_m__..m_

t

I' Pr. Bart D. Withers Wolf Creek Generating Station w:'f Creek Nuclear Operating Corporation Unit No. }

cc:

Jay Silberg, Esq.

Mr. Gerald Allen Shaw, Pittman, Potts & Trowbridge Public Health Physicist 1800 M Street, NW Bureau of Air Quality & Radiation

' ashington, D.C.

20036 Control i

Division of Environment Chris R. Rogers, P.E.

Kansas Department of Health Manager, Electric Department and Environment Public Service Commission Forbes Field Building 321 P. O. Box 360 Topeka, Kansas 66620 Jefferson City, Missouri 65102 Mr. Gary Boyer, Plant Manager Regional Administrator, Region III Wolf Creek Nuclear Operating Corp.

U.S. Nuclear Regulatory Commission P. O. Box 411 799 Roosevelt Road Burlington, Kansas 66839 Glen Ellyn, Illinois 60137 Regional Administrator, Region IV Senior Resident Inspector / Wolf Creek U.S. Nuclear Regulatory Commission c/o V. S. Nuclear Regulatory Commission Office of Executive Director P. O. Box 311 for Operations Burlington, Kansas 66839 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Mr. Robert Elliot, Chief Engineer Utilities Division Mr. Otto Maynard, Manager Licensing Kansas Corporation Commission Wolf Creek Nuclear Operating Corp.

4th Floor - State Office Building P. O. Box 411 Topeka, Kansas 66612-1571 Burlington, Kansas 66839

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