ML20239A375
| ML20239A375 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 09/14/1987 |
| From: | Andrews R OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-87-001, IEB-87-1, LIC-87-608, NUDOCS 8709170296 | |
| Download: ML20239A375 (35) | |
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Omaha Public Power District I6?3 Hartley Omaha, Nebraska 68102 402/536 4000 September 14, 1987 LIC-87-608 U. S. Nuclear Regulatory Commission l
Document Control Desk l
Washington, DC 20555
Reference:
Docket No. 50-285 l
Gentlemen.
SUBJECT:
Response to NRC Bulletin 87-01, Thinning of Pipe Walls in Nuclear Power Plants Omaha Public Power District (OPPD) received the subject bulletin on July 13, 1987.
This bulletin requested a written reply, submitted under cath or affirmation pursuant to the provision of Section 182a, Atomic Energy Act of i
1954, as amended, within 60 days of date of receipt. Accordingly, please find attached OPPD's response to the bulletin.
If you should have any questions i
concerning this matter, please do not hesitate to contact us.
Sincerely, ffhM/@c J R. L. Andrews Division Manager Nuclear Production RLA/me cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Ave., N.W.
l Washington, DC 20036 R. D. Martia, NRC Regional Administrator A. Bournia. NRC Project fianager P. H. Harrell, NRC Senior Resident Inspector i
8709170296 870914 PDR ADOCK 05000285 j
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j UNITED STATES OF AMERICA NUCLCAP REGULATORY COMMISSION In the Matter of
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Omaha Public Power District
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Docket No. 50-285 (Fort Calhoun Station
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Unit No. 1)
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i AFFIDAVil I
I R. L. Andrews, being duly sworn, hereby deposes and says that he is the l
Division Manager - Nuclear l'roduction of the Omaha Public Power District; that as such he is duly authorized to sign and' file with the Nuclear Regulatory Commission the attached information relative to NRC Bulletin 87-01, concerning the thinning of pips uails in nuclear power plants; that he is familiar with the content thereof; and that the matters set'forth therein are true and j
correct,to the best of his knowledge, information and belief.
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R. L. Andrews Division Manager Nuclear Production i
STATE OF NEBRASKA)
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COUNTY OF DOUGLAS) l 1
Subscribed and swain to before me, a Notary Public in and for the State of Nebraska oli this l@
day of September, 1987.
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Ma.vA L. EVANS l
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i FESPONSE TO NRC BULLETIN N0. 87-01 THINNING OF PIPE Wall S IN NUCLEAR POWER PLANTS Bulletin No. 87-01, issued July 9,1987, requested that licensees " provide I
information concerning their programs for monitoring the wall thickness of l
pipes in condensate, feedwater, steam, and connected hfgh energy piping systems, including all safety-related and non-safety-related piping systems l
fabricated of carbon steel". The program OPPD developed as a result of the Surrey incident and Information Notice 86-106 was 'put into effect prior to the start of the 19P7 Fort Calhoun Station outage that began in March and ended in June 1987. The scope of the program included only non-safety-related piping systems. The safety related (CQE) piping systems were determined to be adequately covered by weld inspection and hydrostatic testing that are required l
l to be performed.
The systems selected for inspection were feedwater (steam l
generator feedwater and blowdown, heater vents, heater drains, and condensate) i and main steam (extraction steam).
The locations are detailed on Attachment 1.
The follcuing information provided is based on the scope of the inspections performed during the 1987 outage.
l 1.
Identify the codes or standards to which the piping was designed and l
fabricated.
RESPONSE
The piping inspected was originally designed and fabricated in accordance with USAS B31.1, 1961, Power Piping. Generally, piping installed as the result of modifications was designed and fabricated to the original or equivalent code requirements.
l 2.
Describe the scope and extent of your programs for ensuring that pipe wall thicknesses are net reduced below the minimum allowable thickness.
Include in the description the criteria that you have established for-l a.
selecting points at which to make thickness measurements
RESPONSE
l Inspection locations indicated in Attachment I were selected on the basis of l
guidelines set forth in EPRI Report NP-3944, " Erosion / Corrosion in Nuclear Plant Steam Piping:
Causes and Inspecting Program Guidelines".
The guidelines used are as follows:
Branch connections off the side and bottom of a run of pipe are a
expected to contain a higher amount of moisture and consequently have a higher erosion / corrosion rate than branch connections located on the top of the pipe run, i
Where changes in direction and other discontinuities do not allow a
i turbulence to dissipate, a higher rate of erosion is expected.
On i
systems where only limited inspection is possible, areas that are to l
be checked are those where two changes in direction are separated by the least distance.
1
j i
i Response to Item 2 (Continued)
Branch connections of 90 degrees generally have a higher a
erosion / corrosion rate than bends and elbows, and should be a higher priority than. lateral type connections.
Elbows with turning vanes are expected to have significantly lower m
erosion / corrosion rates than those without turning vanes.
- However, areas just downstre?m of turning vanes have a higher erosion / corrosion rate than elbows without turning vanes due to turbulence of the flow rejoining after leaving the vane.
Areas where repairs were previously made using internal placement of m
weld metal are particularly susceptible to severe erosion / corrosion.
Areas around the repairs should be inspected, especially the leading and trailing edges with respect to fluid flow, As the radius of changes in direction is reduced, the rate of m
erosion / corrosion is expected to increase.
Short radius elbows are more susceptible to erosion / corrosion than long radius elbows.
Where fluid and/or steam has an opportunity to experience a pressure a
drop, i.e. downstream of_ expanders, downstream of orifices and i
downstream of valves, erosion / corrosion will occur at a higher rate j
than in a straight run of pipe.
i These guidelines apply to both single phase and two phase systems.
The 1987 erosion / corrosion inspection program followed these guidelines in determining locations to be inspected.
For the 1988 refueling outage inspections, Fort Calhoun Station plans to continue to follow the above rules of thumb and additionally utilize EPRI's newly developed Chexal Horowitz Erosion Corrosion (CHEC) computer program to help in predicting potential erosion / corrosion locations, b.
determine how frequently to make thickness measurements
RESPONSE
The erosion / corrosion inspection program is currently set up to inspect suspected components during refueling outages.
However, after receiving a good baseline of data from the program, reduction in the frequency of testing of some locations maybe in order, i.e. those locations showing a low wear rate per cycle and having a high number of cycles remaining before approaching the allowable minimum wall thickness.
c.
selecting the methods used to make thickness measurements
RESPONSE
Ultrasonic testing was selected based on the recommendations contained in EPRI Report NP-3944 to make thickness measurements.
Specific instructions on where l
measurements were to be taken were incorporated into Preventive Maintenance i
procedure PM-PIPE-1.
These inspection instructions / maps are provided in for your information.
2 a
i 1l Response to Item 2 (Continued) d.
making replacement / repair decisions
RESPONSE
There are three wall thicknesses used in the inspection program when making replacement / repair decisions.
Nominal Wall Thickness i
Nominal, wall is the pipe wall thickness expected from a newly fabricated pipe j
for a particular line size and schedule number. Material specification wall tolerances are based on a percentage of nominal wall.
Nominal wall is also used by ultrasonic inspectors during equipment calibration.
Alarm Wall Thickness l
l Alarm pipe wall thicknesses are taken from ASME Section II.
Section II is a j
material specification code with established rejection criteria for material defects and other imperfections. The criteria is a percentage of the nominal wall thickness. ASME Section II is a conservative approach to minimum wall
.)
thicknesses, and therefore was used by the ultrasonic inspection program to-i
" alarm" the inspector and engineer that further evaluation of the inspection i
area is needed. ' When measurements fell below the alarm thickness, additional i
evaluation of inspection areas was performed.
Minimum Wall Thickness The minimum wall thicknesses are calculated using ANSI /ASME B31.1.
Equation I
(3) from Section 104.1.2 of B31.1 calculates the minimum pipe wall thickness
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required for a specific internal pressure.
The equation looks only at the
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internal pressure and does not account for any other forces or bending moments l
found in piping systems. Therefore, the ultrasonic inspection program has i
established these calculated values as the absolute minimum wall thickness i
allowed. Wall thicknesses found to be below these ~ calculated minimums are to be replaced.
l l
Equation (3) of section 104.1.2 from B31.1 states:
P Do i
tm =
+A I
2(SE + P y) l
- where, i
tm = minimum required wall thickness (inches) l 1
y = coefficient having values as given in Table 104.1.1(A) i P = internal pressure (psig), design pressure taken from respective isometric s
drawings Do - outside diameter of the pipe (inches) 3 I
l l
j
e Response to Item 2 (Continued)
SE = maximum allowable stress in material due to internal pressure and joint efficiency at the design temperature (psi)
A - additional thickness (inches), a value of 0 was used to determine minimum wall thickness.
Please note that if a minimum pipe wall of less than 0.1 inch is calculated, the value listed in Attachment 1 is 0.1 inch.
This is consistent with the recommendations of NP-3944., Erosion / Corrosion Inspection Program Schematic, shows the decision process for evaluating ultrasonic wall thickness results. When the measured material wall thickness was found to be greater than the alarm limit, the component was acceptable for continued service.
When the wall thickness was found to be less than the alarm limit, yet greater than the minim'im wall, an evaluation was conducted to determine the feasibility of continued operation. When material wall thickness was found to be below calculated minimum wall, the component was replaced.
OPPD's method of evaluation of components with wall thicknesses below the alarm limit was to develop a wear rate and evaluate the number of cycles it would take to reach the minimum wall thickness.
The equations are shown in.
3.
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):
a.
piping material (e.g., chromium content)
RESPONSE
Piping material was not considered in selecting locations.
However, the following statistics show the material composition of components inspected during the 1987 refueling outage:
Number of Approximate Locations Carbon Steel
- ASTM A106 Grade B 25 14
- ASTM A234 WPB 71 39
- ASTM A105 II 53 30 Total -
149 83 2-1/4 % Chromium 1% Molybdenum Steel
- ASTM A335 P22 2
1
- ASTM A234 NP22 27 15 Total -
29 16 General Electric Special Material -
2 1
1987 Total -
180 100 4
Response to Item 3.(Continued) b.
piping configuration (e.g., fittings less than 10 pipe diameters apart)'
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RESPONSE
Pipe configuration played a major role in the selection of inspection l
locations. Decisions were based on'information published.by EPRI through report NP-3944, " Erosion / Corrosion in Nuclear Plant Steam Piping:
Causes and i
Inspecting Program Guidelines" as discussed _in the response to Item 2.
l i
c.
pH of water in the system (e.g., pH less than 10) l
RESPONSE
The pH of the water in a system was not considered in the selection of initial locations. However, the Fort Calhoun Station feedwater and condensate system operates with a pH less than 10 and was part of the 1987 inspection program, d.
system temperature (e.g., between 190* and 500* F)
RESPONSE
Initial' selection of locations was not based on temperature.
Inspection of piping for erosion / corrosion at Fort Calhoun Station included operating temperatures in a range between 300 to 445'F.
The following is a list of j
j liquid-phase systems inspected during the 1987 refueling outage along with 1
their approximate operating temperatures.
Feedwater Pump Suction Piping 400* F Feedwater Pump Discharge Piping 405* F Feedwater Pump Recirculation. Piping 405* F.
Feedwater Heater Drains Piping 300-400* F i
Heater Drain Pump Suction Piping 360* F Heater Drain Pump Discharge Piping 365* F Moisture Separator Drain Tank Piping 370* F Steam Generator Blowdown 480* F-i Steam Generator Feedwater Heater Piping 445' F e,
fluid bulk velocity (e.g., greater than 10 ft/sec) i l
RESPONSE
1 OPPD realizes fluid velocity is an important consideration, but initial i
locations were not based on velocity.
Velocity was calculated for the locations that required further evaluation. Attachment 5 shows several velocity calculation results on liquid phase systems.
f.
Oxygen content in the system (e.g., oxygen content less than 50 ppb)
RESPONSE
l 0xygen content was not used as a location selection criterion, however, normally the condensate and feedwater systems cre below 50 ppb.
5
' Response (Continued) l
)
4.
Chronologically list and summarize the results of all inspections that have been performed, which were specifically conducted for the purpose of 5
identifying pipe wall thinning, whether or not pipe wall thinning was discovered and any other inspections where pipe wall thinning was i
discovered, even though that was not the purpose of that inspection.
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RESPONSE
OPPD has not reviewed historical records to determine when inspections were requested to identify pipe wall thinning or when thinning pipe walls were i
discovered as the result of other inspection programs.
Historical data would l
have been difficult to use for comparative analysis purposes because I
standardized data collection and measurement techniques have not been used.
Therefore, OPPD chose to institute a new program as discussed in the response l
to this item.
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.
RESPONSE
OPPD developed a Preventive Maintenance procedure specifically to inspect for erosion / corrosion.
The wall thickness measurements taken with this procedure are found in Attachment 1.
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 inspections).
RESPONSE
i The inspection program developed through Preventive Maintenance Procedure PM-PIPE-1, inspected 180 locations throughout the Fort Calhoun Station and
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included the following systems:
Main steam (extraction steam) i m
Feedwater (including blowdown, heater vents, heater drains, and a
condensate)
Two thickness measuring instruments were used during the 1987 refueling l
outage.
They are the DM-2, Portable Ultrasonic Thickness Meter and the USL-38, l
Ultrasonic Scope.
PM-PIPE-1 required Quality Control inspectors to calibrate l
the instrument based on the nominal wall (reference thickness) identified within the procedure.
l QC inspection reports for each location have been retained for reference during future outages.
A prerequisite of PM-PIPE-1 is " Review inspection maps from previous outages for the location of minimum wall. Additional care should be taken when inspecting these minimum locations." The inspection maps identify the location of the minimum reading taken and dimension the minimum area from the nearest preminent feature, i.e.1" downstream of the inlet weld, 2" from top dead.: enter clockwise, looking in the direction of flow.
Descriptions like these allow inspectors to locate the minimum area quickly and accurately.
6
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Response to Item 4 (Continued) i I
j c.
Report thickness measurement results and note those that were l
identified as unacceptable and why.
RESPONSE
l Attachment I shows the results of the PM-PIPE-1 inspection locations conducted during the 1987 refueling outage.
The following information is given for each 3
inspection location:
l inspection number (INS _N0) m description (DESCRIPT) e material (MATERIAL) a design pressure (D_P) i a
material specification (MAT _ SPEC) i a
maximum allowable stress (SE) a outside diameter (0D) m hours the component has been in operation (HOURS)
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m nominal wall thickness (NOMINAL) m alarm wall thick. ness (ALARM) e calculated minimum wall thickness (MINIMUM) l a
actual measured wall thickness (ACTUAL) j m
action taken (COMMENTS)
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l The criterion for replacement is discussed in the response to Item 2.d.
d.
Describe actions already taken or planned for piping that has been found to have a nonconforming wall thickness.
If you. have performed a l
failure analysis, include the results of that analysis.
Indicate i
whether the actions involve repair or replacement, including any change of materials.
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RESPONSE
The comments portion of Attachment I note the categories as discussed below for l
each inspection location included in PM-PIPE-1.
Failure analyses have not been performed. The following categories describe the results of the inspection and the actions taken.
t Comment Action 1
NO WEAR Inspection locations found to have material wall thicknesses in excess of 12.5% of the nominal wall were categorized as locations experiencing no wear.
They are considered acceptable per the PM-PIPE-1 procedure and therefore, require no additional action.
15 locations were found to have no wear during the 1987 refueling outage.
ACCEPTABLE Inspection locations with material wall thickness greater than both minimum wall and alarm wall thicknesses were considered acceptable. During the 1987 refueling outage 79 locations met' i
these criteria.
No additional action was taken on these i
locations, they were considered acceptable for continued operation.
4 i
7 i
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1 ResponsetoItem4(Continued)M O
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BELOW ALARM 68 inspection locations were found to have material wall thicknesses below the established alarm limits and greater e
o than the calculated minimums.
Per PM-PIPE-1, these locations were evaluated and found acceptable for continued operation.
REPLACE Inspection locations showing a measured wall thickness below calculated minimum wall were replaced.
18 locations were replaced during the 1987 refueling outage.
Replacements were made in the following systems: feedwater heater vent piping, 5
extraction steam piping, feedwater pump recirculation piping F
and feedwater pump discharge piping.
The reple.caments were a one-to-one replacement, no change in material,was made.
a 5.
Describe any plans either for revising the present or for developing new or l
additional programs for monitorincJ pipe wall thickness.
1 I spection Metitcd During the 1987 refueling outage, Quality Cbetrol inspectors were instructed by procedure to measure four inspection bands per albow'and two additional inspec-s tion, hands at the discharge of the component.
Through field exparience and industry consultation, this method was found to be puch too " loose"'and did not I
fully evaluate the component.
Following the completion of PM-PIPE-1, informa-tion was released recommending inspections be dene on a two inch grid pattern.
As a result, the 18' replacement components were baselined with thickness readings taken atEthe 1 o' clock position, the 2 o' clock position...and every two inches.
See Attachment 6 for a three dimensional view of the data.
The usefulness of complete component data acquisition prior to service can also be seen. This atttchment shows several manufacturing variations on the ultrasonic baseline wall thicknesses that may have been interpreted as wear during the next inspection.
Field data prior to the replacement of MS-24 has been incor-porated into Attachment 7.
The minimum wall readings of this graph are actual thickness measurements, however, the remainder has been extrapolated to reflect the wear patterns on the component. As can be seen from this attachment, actual field data viewed in a three dimensional graphic form can be helpful in -
better understanding the arosion/ corrosion phenomenon.
Theoretical Analysis of ErosionZrorrosion a
i Immediately fo170 wing the Surry 2 event, EPRI researchers and utility officials gathered to develop a mathematical correlation between system operating parameters and erosion / corrosion wear rates.
The result of their efforts is a personal computer based program (CHEC) used to predict erosion /corrcsion.
The program was recently released for utility use.
OPPD it in the process of obtaining a copy for immer'hte use.
PM-PIPE-1 was developed without the aid of analytical predictive methods.
In light of the new methods available, Fort Calhoun Station will be utilizing more of these methods for the enhancement of the erosion / corrosion inspection program.
8
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Response to' Item 4'(Continued).
Dynamic Procram l:
PM-PIPE-1 was developed with the intention offbeing a' dynamic program; meaning,-
'i through inspection results-it may become apparent that specific locations are not experiencing erosion, thus may be removed from the program.
Conversely, it-may later.be determined that additional. locations ~and systems should.be inspec-ted and the procedure may be modified accordingly.
The current inspection program is set up to inspect components.during refueling outages; however, if locations show little or no erosion or if the wear rates
.are small, inspections may occur at extended intervals.
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ATTACHMENT 2 i
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C______________________
PM-PIPE-1-17
]
ULTRASONIC 90* EL80W MAP Standard 90' elbows are common pipe erosion locations. Ultrasonic elbow maps will be used by future ultrasonic inspectors to evaluate the minimum wall locations. Review past maps of this inspection area to identify the minimum wall location. Carefully inspect this minimum location in order to provide an accurate wall thickness.
Inspection Procedure Inspect 2/3 of the elbow circumference on the long radius surface, taking a minimum of six readings around the inspection band.
Continuous _ scan if possible.
Spare four inspection bands across the elbow and one at the trailing edge of the weld.
j Inspect the entire circumference one pipe diameter beyond the elbow weld when possible, taking a minimum of eight readings around the band. Continuous scan if possible.
Record the minimum reading and its location. Dimension the minimum location from the nearest prominent feature, i.e., elbow weld.
Inspection #
i P & ID #
Isometric #
Location
Description:
Minimum Wall Reading:
inches Flow
/
J Inspection Band ISSUtD FEB 2 31987 FC/PM/02 R0 2-23-87
=
D
=
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PM-PIPE-1-18.
l ULTRASONIC STRAIGHT PIPE MAP I
Flow obstructions are possible pipe erosion locations. Ultrasonic straight pipe maps will be used by future ultrasonic inspectors to evaluate the minimum wall locations. Review past maps of this inspection I
area to identify the minimum wall location. Carefully inspect this minimum location in order to provide an accurate wall thickness.
_I_n_spection Procedure Inspect the entire circumference of the pipe every half a pipe diameter from the flow obstruction. Take a minimum of eight readings around the inspection band. Continuous scan if possible. Continue inspection for five pipe diameters, when possible.
Record the minimum reading and its location. Dimension the minimum location from the nearest prominent feature, i.e.', orifice, etc.
Inspection #
P & 10 #
Isometric #
Location
Description:
1 Minimum Wall Reading:
inches Flow Obstruction Inspection Band 1
i Flow I
i
)
+%-
_ h _.,
s 5D
=
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FC/PM/02 R0 2-23-87 l
FEB 2 31987 1
1
PM-PIPE-1-19 ULTRASONIC TEE MAP Mixing tees are possible pipe erosion locations. Ultrasonic tee maps will be used by futttre ultrasonic inspectors to evaluate the minimum wall locations.
Review past maps of this inspection area to identify the minimum wall location.
carefully inspect this minimum location in order to provide an accurate wall I
thickness.
Inspection Procedure Inspect 2/3 of the tees' flow reflecting circumference, taking a minimum of six readings.around the inspection band. Continuous scan if possible. ~ Space four inspection bands across the tee.
i Piping on each side of the tee should also be inspected.
Inspect 2/3 of the circumference on the trailing edge of the weld, half a pipe diameter from the j
tee weld and one pipe diameter from the tee weld. Take a minimum of six l
I readings per inspection band and continuous scan 'if possible.
~ Record the minimum reading and its 1ccation. Dimension the minimum location from the nearest prominent feature, i.e., tee weld.
Inspection #
P & 10 e Isometric #
I Location
Description:
i Minimum Wall Reading:
inches
+ v4 - Q
+%
0/2 1
u 1
ISSUED FEB 2 31987 c /N FC/PM/02 R0 2-23-87
PM-PIPE-1-20 ULTRASONIC EXPANDER MAP Standard expanders are common pipe erosion locations. Ultrasonic expander maps will be used by future ultrasonic inspectors to evaluate the minimum wall locations. Reffew past maps of this inspection area.to identify the minimum wall location. Carefully inspect this minimum location in order to provide an
' accurate wall thickness.
Inspection Procedure _
Inspect the entire circumference of the expander at two locations, taking a minimum of eight readings around the inspection band. Continuous scan if possible. Also inspect the piping downstream of the expander every one quarter of the pipe diameter for one complete pipe diameter.
Record the minimum reading and its location.
Dimension the minimum location from the nearest prominent feature, i.e., expander weld.
Inspection #
1 P & IO #
Isometric #
Location
Description:
Minimum Wall Reading:
inches
^^
0 j
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/
D x
N N
I'$ 'S' U E D FC/PM/02 FEB 2 3 It Inspection sand R0 2-23-87
PM-PIPE-1-21 ULTRASONIC REDUCER MAP Reducers are pos.ible pipe erosion locations. Ultrasonic reducer maps will be usej by future ultrasonic inspectors to evaluate the minimum wall lotattens.
Review past maps of this inspection area I
to identify the minimum wall location. Carefully inspect this minimum location in order to provice an' accurate wall thickness.
Inspection Pror.edure Inspect the entire circumference of the reducer at two locations, taking a minimum of eight readings around the inspection band.
Continuous scan if possible. Also inspect the piping downstream of the reducer, every half a pipe diameter from the reducer weld for two pira dianreters, if possible.
Record the minimum reading and its location. Dimension the minimum location from the nearest prominent feature, i.e., orifice, etc.
Inspectior #
P & ID #,
Isometric #
Location Cascription:
l
/
Minimum Wa;i Reading:
inches 1
l Inspection Band N
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Flow m
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l
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/
J ~ 9) - <#2 z
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=
FC/PM/02 FEB 2 31987
.R0 2 23-87 1
PM-PIPE-1-22 ULTRASONIC END CAP MAP Piping end caps are possible pipe erosion locations. Ultrasonic end cap maps will be us,ed by future ultrasonic inspectors to evaluate the minimum wall locations. ' Review past maps of this inspection area to identify the minimum wall location. Carefully inspect this minimum location in order to provide an accurate wall thickness.
Inspection Procedure Inspect 2/3 of the circumference on the discharge pipe of the cap, taking a minimum of six readings around the inspection band. Continuous scan if possible.
Inspect at the discharge pipe junction, half a pipe diameter 1
from the junction and one pipe diameter from the junction.
Inspect the entire circumference of the end cap pipe, taking a minimum of eight readings around the inspection band. Continuous scan if possible.
Space at least one inspection band between the discharge junction and cap..
The end cap should be inspected at a minimum of.nine locations. A recommended inspection grid is outlined below. Note any variance in inspection. Continuous scan if possible.
Record the minimum reading and its location.
Dimension the minimum location from the nearest prominent feature, i.e., end cap etc.
Inspection #
P & ID #
Isometric #
Location
Description:
Minimum Wall Reading:
inches j
D/2 4
n 0
4 1
SSUED FE8 2 31987; FC/PM/02 R0 2-23-87
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EROSION / CORR 0SI0fi INSPECTION PROGRAM SCHEMATIC If the measured material Map and record the wall thickness is greater--._, minimum wall of the :
than the alarm limit inspection area..
Continue operation with no change.
If the measured material Map and record.the wall thickness is less minimum wall-of the than the alarm limit, yet----> inspection area.
Ultrasonic Material greater than the minimum Perform an evaluation of; Wall 1 Thickness wall thickness.
the inspection area to Measurement determine the. number.of cycles remaining based on wear rate.
1 If the measured material wall thickness is less than the alarm limit and----
- Replace less than the minimum wall thickness
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ATTACHMENT 4
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FM-PIPE-1 CALCULATIONji Tn ( 1 + MSP ) - Tc WEAR RATE - -- ------------------
(inches / hour)
H Tn = nominal wall thickness (inches)
MSP - ASME Section II, Material Specification Percentarje of nominal wall for ASTM equivalent piping specification:
l ASTM A105
'5.0% (0.05)
J ASfM A106 12.5% (0.125)
ASTM A234 12.5% (0.125)
J ASTM A335 12.5% (0.125)
Ta - actual measured wall thickness (inches)
H hours of operation (the number of 10,000 hour0 days <br />0 hours <br />0 weeks <br />0 months <br /> periods the plant has been in operation since the installation of the inspection location). At the completion of Cycle 10, Marcn 1987, the plant has l
operated a total of 90,971.1 hoLrs since original startup, thus H - 9.097 periods.
Cycle 10 operation lasted 9,848.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, therefore, components replaced last outage would have H - 0.98482.
I Ta - Tm l
REMAINING CYCLES - ----------
j WR x HPC j
i Tm - minimum wall according to ANSI B31.1 (inches)
HPC - the number of 10,000 hour0 days <br />0 hours <br />0 weeks <br />0 months <br /> periods per cycle.
A 15 month cycle has J
approximately 10,800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br />, HPC - 1.08.
WR - wear rate (inches / hour), as defined above, or actual wear rate as determined by two separate inspections P x Do MINIMUM WALL - ------------ + A - Tm (inches), according to ANSI B31.1 2(SE + Py)
P internal pressure (psig)
Do - outside pipe diameter (inches)
SE = maximum allowable stress (psi), 831.1 Appendix A coefficient, 0.4, B31.1, Table 104.1.2(A) y A
additional thickness - 0 inches
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ATTACHMENT 5 1
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VELOCITY CALCULATIONS MASS FLOW SPEC-VOI.
ID VELOCITY LBM/HR FT3/L8M INCHER FT/SEC LOCATION 3,306,791 0.019250 8.000 50.7 Main Feedwater Header in Room 81
'3,306,791 0.018617 10.000 31.4 Feedwater Leaving "A" Feed-water Pump l
1,729,674 0.018211 8.000 25.1 Discharge Header From Heater
(
Drain Ptmps 6,613,582 0.018617 17.438 20.6 Feedwater Leaving the Feedwater Pumps 333,040 0.018315 4.000 19.4 Feedwater Heater 5 Drains i
186,611 0.018827 3.000 19.9 Feedwater Heater 6 Drains 20,000 0.018617 1.500 8.4 Blowdown to Blowdown Tank 1.
864,837 0.018240 12.000 5.6 Heater Drain Pump Suction Piping 119,857 0.018276 6.000 3.1 Moisture Separator Drain Tank i
to Heater Drain Tank i
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