ML20030C502
| ML20030C502 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/19/1981 |
| From: | TEXAS UTILITIES SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20030C497 | List: |
| References | |
| PROC-810819, NUDOCS 8108260170 | |
| Download: ML20030C502 (15) | |
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l ATTACHMENT 1 Comanche Peak Steam Electric Station Units 1 and 2 Proposed Gecondary Water Chemistry Monitoring Program Revision 2
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NRC Docket Nos. 50-445 and 5-446 l
August 19, 1981 8108260170 810819 P DFt ADOCK 05000445 A
PDR I
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Comanche Peak Proposed Secondary Water Chenistry Monitoring Program The CPSES secondary sanpling schedule will be, in large part, Westinghouse's suggested general schedule for sanpling. This schedule will be included into procedure CHM-106.
The sampling control points for secondary systen chemical paraneters are steam generator (water), main steam and condensate feedwater.
Table 1 provides chemical paraneters and their values for power operation for each control point. Figure 1 shows these sanpling points (and others) on a secondary system schematic.
The CPSES Secondary Water Chemistry Monitoring Progran has been established to maintain the integrity of the steam generators.
The critical control paraneters are the steam generator water chemistry as measured in the steam generator blowdown. Tables 2 thru 5 provide steam generator critical water chemistry for operational modes.
The procedures used to measure the value of chemical parameters are:
a.
pH-CHM-332 - This method involves the immersion of a glass electrode into the sanple and recording the reading on the meter.
b.
Conductivity - CHM-309 - This method involves the measurement of the electrical conductance of the sanple using a dip cell or a flow cell connected to a bridge type instranent.
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c.
Chloride - CHM-203 - Several methods will be applicable for this analy si s.
Those that may be used are:
(1) a titranetric method using dilute mercuric nitrate solution in the presence of mixed diphenylcar'eazone - branophenol blue I
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(2) a spectrophotometric method that uses the formation of Ferric thiocynate complex from the reaction of chloride ion with mercuric thiocyanate.
d.
Suspended Solids - CHM-330 - This method involves the filtration of the sample through a 0.45 micron filter paper and weighing ine increase in weight of the filter paper.
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Silica - CHM-325 - This method is a spectrophotmetric method. A colored cmplex is produced by the reaction of soluble silica with i
molyndate.
f.
Flourides - CHM-204 - Specific ion electrode technique.
Process sampling points and potential grab sanple points are provided in Table 6.
Procedure CHM-101, " Chemistry Docuent Control" will describe the methods, techniques, and responsibilities for the recording of all chemistry data, the review of the analytical results or trends, and the records storage requirenents for this infonnation. The responsible senior technician, Radiochemist and the Chemistry and Enviromental Engineer shall have a review responsibility of these chenical records.
The Chemistry and Health Physics Engineer has overall review responsibility of these records.
Initiation of action to maintain Steam Generator Water Chemistry is not limited to maintaining the critical control p;raneters (see tables 2 thru 5). Chemical parameters at other locations (as described above) in the secondary system are also monitored. When paraneters at other locations exceedlimits or ranges, indicating possible contaminant ingress, action will be taken to verify ingress, locate the source ar.d L
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minmize or climinate the contaninant ingress. Early action can control or eliminate contaninants without observing any changes in the steam gena ator water critical parameters.
If abnormal chemistry cannot be corrected within a reasonable period of time by chemical additien, use of full flow conden: ate polishers, and/or steam generator blow-down, the plant may decrease power so that the system causing the problem can be isolated and repaired.
Corrective actions due to abnonnal chenistry conditions are provided in Table 7.
The Chenistry and Environmental Engineer has overall responsibility for the timely reconnendation of corrective actions to correct abnonnal secondary side chenical conditions. The Manager of Plant Operations is responsible for deciding to modify plant operations because of abnormal chemical conditions.
Procedure CHM-104 indentifies the Chemistry and Environmental Engineer i
as the authority responsible for the interpretation of data.
Once the Chemistry and Environmental Engineer is aware of the off control point condition, and it cannot be corrected within a reasonable amount of time, he will notify the Manager of Plant Operations through the Engineering Superintcadent, who upon ascertaining the situation and cor.sidering consequences, will decide upon a schedule for appropriate correction of the problem.
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TABLE 1 1
Secondary Water Chanistry (Power Operation) i Steam Generator (water) i j
pH at 250C 8.5 to 9.2 cation conductivity (max.),
2.0 micromho/cm j
free hydroxide (max.), as ppm Ca C03 0.15 chloride, _ as ppm Cl 0.15 suspended Solids (max.), ppm 1.0 5.0 i
silica (max.), as ppm SiO2 sodium, as ppb
< 150 Condensate Feedwater pH at 250C 8.8 to 9.2 l
disolved solids (max.),
1.0 as ppm Ca C0 3
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free hydroxide (max.),
0.15 as ppm Cl iron and copper, ppm (each) 0.01 l
0.005 dissolved oxygen, as ppm 02 l
hydrazine (residual), as ppm N24 0.01 H
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l ph at 250C 8.8 to 9.2 cation conductivity (max.),
2.0 l
i micromho/cm l
l silica (max.), as ppm SiO 0.5 2
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1 TABLE 2 STiAM GENERATOR CRITICAL WATER CHEMISTRY FOR POWER OPERATION i
i CRITICAL PARAMETER SAffLE FREQUENCY LIMIT / RANGE 4
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pH at 25 C Caily 8.5 - 9.2 0
l Cation Conductivity Daily 1 2.0 unhos/cm i
Ladign Concentration ppb Daily 1 150 i
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During power operation chenical impurities will be controlled by steam generator blowdown rate.
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TABLE 3 STEAM GENERATOR CRITICAL WATER CHEMISTRY FOR STARTUP/ HOT STANDBY
(>3500F)
CRITICAL PARAMETER SAMPLE FREQUENCY LIMIT / RANGE ph at 250C Daily 8.5 - 10.0 Cation Conductivity Daily 1 7.0 i
mnos/c.
1 Sodiun Concentration Daily i 500 ppb 1.
Departure from the 8.5 - 9.2 pH range allows for increased NH 3 resulting from decomposition of hydrazine used for secondary system layup.
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During startups, up to 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> from the initiation of plant loading, additional latitude from normal operating spe lfications is provided due to increased levels of contaminants.
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During startup chemical impurities will be controlled by steam generator blowdown rate.
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TABLE 4 STEAM GENERATOR CRITICAL WATER CHEMISTRY FOR HOT SHUTDOWN
(>2000F <3500F)
CRITICAL PARAMETER SAMPLE FREQUENCY LIMIT / RANGE i
pH at 250C Daily 8.5 - 10.0 Cation Conductivity Daily
< 7.0 unhos/cm Sodiuni Concentration Daily
< 500 ppb i
1.
Departure from the normal 8.5 tc 9.2 pH range allows for increased NH3 resulting from decomposition of hydrazine used for steam generator system layup.
2.
During startups, up to 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> from initiation of plant loading, additional latitude from nonmal operation specifications is provided dur to increased levels of contaminants.
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TABLE 5 STEAM GENERATOR CRITICAL WATEK CHEMISTRY FOR COLD SHUTDOWN (<2000 )
F CRITICAL PARAMETER SAMPLE FREQUENCY LIMIT / RANGE pH at 250C 1/ week 10.0 - 10.5 Chloride pt, 1/ week 1 0.5 Hydrazine ppm 1/ week 75 - 100 Dissolved Oxygen ppb 1/ week i 100 I
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TABLE 6 SECONDARY PLANT SAMPLING SYSTEM SOURCES Parameter Receiver and j
Sample Source Measured Function Range Hot wells cation recorder with 0.1 to 10 (2 samples) conductivity high alarm mmho/cm i
Hot well salinity specific indicator with 0 to 100 troughs conductivity high alarms mmho/cm l
(16 local points)
Condensate pump dissolved recorder with 0 to 20 ppb; discharge oxygen high and low 0 to 200 ppb alarms pH recorder with 2 to 12 4
high and low alarms sodium ion recorder with 1 to 100 ppb high alarm Heater drain cation recorder with 0.1 to 10 punp discharge conductivity high alarm mmho/cm pH recorder with 2 to 12 l
high and low alarms i
Polisher outlet cation recorder with 0.1 to 10 conductivity high alarm mmho/cm
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TABLE 6 (Continued)
SECONDARY PLANT SAMPLING SYSTEM SOURCES
?araneter Receiver and Sample Source Measured Function Range pH recorder with 2 to 12 high and low alarms Steam generator Hydrazine recorder with 0 to 50 ppb feedwater high and low (4 sanples) alarms cation recorder with 0.1 to 10 conductivity high alarm mmho/cm pH recorder with 2 to 12 high and low alarms Main Steam cation recorder with 0.1 to 10 (4 samples) conductivity high alarm mmho/cm pH recorder with 2 to 12 high and low l
alarms silica recorder with 0 to 100 ppb high alarm Vacuum deaerator dissolved recorder with 0 to 20 and outlet ozygen high alarm 0 to 200 ppb
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TABLE 6 (Continued) 4 SECONDARY PLANT SA>PLING SYSTEM SOURCES l
Parameter Receiver and Sample Source Measured Function Range i
Auxiliary condenser specific indicator with 0 to 100 outlets conducti~!i ty high alarm mmho/cm (2 local points)
Steam Generator ph meter with 2 to 12 Blowdown recorder and 1
high and low alanns cation meter with 0 to 10 conductivity recorder and mmho' s high alarm l
sodium Recorder with 0.1 to 1000 l
analyzer alarm ppb l
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TABLE 7 Corrective Action Due to Abnormal Chemistry Conditions During Normal Operations Typical Event:
Condenser Tube Leakage Surveillance:
An increase in the normal limits of such critical paraneters as cation conductivity and sodium concentrations will prompt Action Levels to be initiated.
Critical Parameter Normal Abnormal Measurement
- Concentration Concentration Action Level Cation Conductivity 12 nahos
>2 but < 5 mmhos I
>5 but < 7 unhos 11
>7 unhos III Sodium Concentration
<150 PPB
>150 but < 220 PPB I
>220 but 1 500 PPB II
>500 PPB III Action Level I
- Identify and correct the problem causing the abnonnal chemistry. Abnormal condition should return to normal within 7 days, if not proceed to i
Action Level II.
Action Level II
- Within four hours reduce power to less than 50%.
Correct abnormal condition within 100 hvirs, if not proceed to Action Level III.
Proceea innediately to Hot Shutdown.
Action Level III
d TABLE 7 (Continued)
Corrective Action Due to Abnormal Chemistry Conditions During Normal Operations b
- As measured at the Steam Generator Blowdown.
- Note: Nonnal and abnormal concentrations and action level times were selected for illustrative purposes only.
Real values will be developed later and will be selected using the latest guidance from the industry, Westinghouse, and research groups such as the Electric Power Research Institute.
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