ML20234D217
| ML20234D217 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 09/10/1987 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-87-001, IEB-87-1, ULNRC-1591, NUDOCS 8709220014 | |
| Download: ML20234D217 (14) | |
Text
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a 1901 Gratiot Street. St. Louis Donald F. Schnell Vice President September 10, 1987 Mr. A. Bert Davis-Regional Administrator USNRC Region III 799 Roosevelt Road l
Glen Ellyn, IL 60137 ULNRC-1591 l
Dear Mr. Davis:
l DOCKET NO. 50-483 CALLAWAY PLANT l
FACILITY OPERATING LICENSE NPF-30 THINNING OF PIPE WALLS IN NUCLEAR POWER PLANTS
Reference:
NRC I & E Bulletin No. 87-01, dated July 9, 1987 The attachment to this' letter provides-the l
requested information concerning the Callaway program for monitoring wall thickness in selected high-energy piping systems.
If you have any additional questions, please contact us.
Very truly yours,
)
Donald F.
Schnell-
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sep 1g Maihng Adcitess: P.O. Dox 149, St. Louis, MO 63166
)2l $
STATE OF fiISSOURI )
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Donald F.
Schnell, of lawful age, being first duly sworn upon oath says that he is Vice President-Nuclear and ~an of ficer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full. power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
/
/
Donald F. Schnell '~
Vice President Nuclear SUBSCRIBED and sworn to before me this /[
day of M M, 198,7 0'.04 BARGARAd./PFAFff N01 ARY PUBUC, STATE OF MISSOURI MY COMMISSION EXPIRES APRit. 22, 1989 ST. LOUIS COUNTY.
cc:
Gerald Charnoff, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N.
Street, N.W.
Washington,.D.C.
20037 Dr..J. O. Cermak r
l CFA, Inc..
(Suite 110) 4 Professional Drive Gaithersburg, MD 20879 W. L.
Ferney Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory' Commission Region.III 799 Roosevelt Road Glen Ellyn, Illinois 60137 i
Bruce Little Callaway Resident Office U.S. Nuclear Regulatory Commission RR#1 Steedman, Missouri 65077 Tom Alexion (2)
Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 316 7920 Norfolk Avenue Bethesda, MD 20014 Manager, Electric Department Missouri Public Service Commission P.O. Box 360 i
l Jefferson City, MO 65102 U.S.
Nuclear Regulator Commission Document Control Desk Washington, D.C.
20555 i
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ATTACHMENT Id'ULNRC-1591 ff g
CAL 1AWAY PLANT iy i
RESPONSE TO NRC BULLETIN.87-01 S
q Action Requested:
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Within 60 days from the receipt of Bulletin 87-01, liebnsd4srare c,
requested.toprovideinformationconcerning.the'1'r/programfor monitoring the wall thickness of pipes,in condeedate, feedwater, steam, and-connected high-energy piping systems,. including all safety-related and non-safety-related piping systems fabricated of-carbon steel.
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Action Item 1 r
UI Identify the codes or standards to which the piping was designed and
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fabricated.
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Pesponse:
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The codes or standards to which the subject piping was designed and fabricated are identified as follows:
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a1 1' System 8
Codes
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Condensate
. ANSI B31.1 f
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$ ASME Section III and ANSI B31.1 Steam ASME Section III j
I and ANSI B31.1 Connected High Energy
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ASME Section III Piping
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and ANSI B31.1
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Safety-Related Carbon
/ j' j (iASME Section III Steel Piping
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Non-Safety-Related ANSI B31.1 Carbon Steel Piping j
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g Action Item 2 Describe the scope and extent of your programs for ensuring that pipe l'
.wal1 thicknesses are not reduced below the minimum allowable
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thickness.
Include in the description the criteria that you have established for:
j a.
selecting points at which to make thickness measurements
.b.
determining how frequently to make thickness measurements
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selecting the methods used-to make thickness measurements d.
making replacement / repair decisions
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Response
The scope of the Callaway Erosion / Corrosion (E/C) Program is to
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identify and trend pipe wall thinning in single and two-phase flow piping systems. This includes plain carbon steel and stainless steel l,
piping as well as safety-related and non-safety-related piping.
The
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plain carbon steel piping is inspected for erosion due to flow
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assisted corrosion (FAC) and/or cavitation, while the stainless steel piping is inspected for erosion due to cavitation.
2a) The selection of points for thickness measurement is based upon two methods, experience and 'analyais.
Industry and plant experience provide a means to select components based upon simi:arities to components that have experienced wa11' thinning.
Analysis is used to select components based upon the potential f,/
for wall thinning. Analysis has been performed by using EPRI Report NP 3944, " Erosion / Corrosion in Nuclear Plant Steam Piping:
Causes and Inspection Program Guidelines".
Both methods have proven successful at Callaway.
l 2b) The frequency of inspection is based upon engineering evalua-77 tions which are performed following an inspection. Present reinspection varies from a three-month schedule to an i
'O eighteen-month schedule for various piping systems.
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2c) Ultrasonic testing (UT) is the method generally used for l
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thickness measurement as specified by the Callaway E/C Program.
1 On occasion, radiographic testing has also been used.
The decision to repair / replace unacceptable piping is made by the 2d)
Callaway engineering staff and is based upon code requirements for stress icvels, personnel hazard, and operational history.
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,y fction Item 3
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1 For liquid-phase systems, state specifically whether the following factors have been considered in establishing your criteria for selecting points at which to monitor piping thickness (Item 2a):
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a.
piping material (e.g., chromium content) b.
piping configuration (e.g., fittings less than 10 pipe diame-ters apart) c.
pH of water in the system (e.g., pH less than 10) d.
system temperature (e.g., between 190 and 500*F).
e.
fluid bulk velocity (e.g., greater than 10 ft/s) f.
-oxygen content in the system (e.g., oxygen content less'than 50 ppb)
Response
Factors which have been used in selecting points for. inspection j
include piping material configuration, temperature, and fluid l
bulk velocity. These factors have been used since the program inception in May 1985. Use of additional factors (e.g., pH of water in the system and oxygen content in the system) will be included in the future through the use of the EPRI CHEC computer program.
Action Item 4 Chronologically list'and summarize the results of all inspections that
- I have been performed, which were specifically conducted for the purpose of identifying pipe wall thinning, whether or not pipe wall thinning was discovered even though that was not the purpose of that inspection.
a.
Briefly describe the inspection program and indicate whether it was specifically intended to measure wall thickness or whether wall thickness measurements were an incidental determination.
b.
Describe what piping was examined and how-(e.g., describe the inspection instrument (s), test method, reference thickness, locations examined, means for locating measurement point (s) in subsequent inspection).
1 c.
Report thickness measurement results and note those that were identified as unacceptable and why.
d.
Describe actions already taken or planned for piping that has been found to have a nonconforming wall thickness.
If you have performed a failure analysis, include the results of that analysis. Indicate v' her the actions involve repair or replacement, includi ; anf change of materials.
'i
Response
The results as listed in Table 1, " Erosion / Corrosion Inspection Results" were generated through the use of the Callaway E/C Inspection Program. This program specifically covers the l
inspection of piping for pipe wall thinning.
1 Page 3 of 4 l
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The areas of piping inspected by.the Callaway program vary for the.
type of component. Elbows are inspected from the outside radius to the center line of the elbow.. Straight. pipe.is inspected 100%
E circumferential1y near a suspect location. Tees are inspected on the l
inside radius of the branch exit and'360" circumferential1y around the; tee branch. All' areas of inspection are' identified in the plant progran and are inspected with ultrasonic equipment (Cathode Ray Tube). A documented 2" x 2" square grid is currently utilized on those components with identified thinning.
' Action Item 5 l
Describe any plans either for revising-the.present or for developing l
'new or additional programs for monitoring pipe wall thickness.
l
Response
The Callaway E/C Program-is '.evised periodically. 'The revisions are needed to update the program with current erosion / corrosion information and to include additional inspection-items. A major scheduled revision will occur in early 1988 when the analysis of plant piping with the EPRI CHEC program is complete. At that time
. additional systems and components will be included as required.
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