ML19317D533
| ML19317D533 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/22/1976 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317D529 | List: |
| References | |
| NUDOCS 7912060787 | |
| Download: ML19317D533 (3) | |
Text
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it 3.11 SECONDARY WATER CHEMISTRY Applicability Applies to the limiting conditions of secondary system feedwater when reactor 0
coolant temperature is above 300 F.
Objective To limit the steam generator eatio. (acid) conductivity in the final feedwater.
Specification 3.11.1 While in the startup mode and with final feedwater cation conductivity greater than 0.5 umho/cm but less than 1.0 pmho/cm, restore the conductivity to 0.5 pmho/cm or less within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or reduce reactor coolant system temperature below 300 F within an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
3.11.2 During operation other than startup and with final feedwater cation conductivity greater than 0.5 pmho/cm but less than 1.0 pmho/cm, restore the conductivity to 0.5 umho/cm or less within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or reduce reactor coolant system temperature below 300"F within an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
3.11.3 With final feedwater cation conductivity greater than 1.0 pmho/cm but less than 2.0 pmho/cm, restore the conductivity to the provisions of Specifications 3.11.1 or 3.11.2 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or reduce reactor coolant system temperature below 300 F within an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
3.11.4 With final feedwater cation conductivity greater than 2.0 paho/cm, restore the conductivity to the provisions of Specifications 3.11.1, 3.11.2, or 3.11.3 within one hour or reduce reactor coolant system temperature below 300 F within an additional 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
3.11.5 The provisions of Specification 6.6.2.1 b(2) apply only when it becomes necessary to reduce the reactor coolant system temperature below 300 F to remain within the provisions of this specification.
1 Bases Contamination of the steam generator secondary coolant can cause potential tube degradation and impair tube integrity.
Generally, the most severe contamination results from condenser inleakage of caustic-forming impurities l
that may accumulate on the secondary side of the steam generator, or on the l
high heat flux surfaces of the steam generator tubes and can lead to the potential for intergranular stress corrosion cracking. The cation conduc-tivity of the steam generator final feedwater will indicate direct potential damage.
Controlling the secondary water chemistry within the specified limits will control the potential accumulation of corrosive impurities in the steam generator and minimize tube degradation.
These limits provide reasonable 060'2' h
3.11-1
~
v assurance that the conditions in the steam generator will minimize the potential for tube degradation during all condftions of operation, and postulated accidents. These measures ensure t e continued protection of the steam generator tubing which is an essen' al part of the reactor coolant pressure boundary.
During plant startups, small air inleakage may occur in the condensate and feedwater system.
Carbon dioxide ingress through these leaks elevates the feedwater cation conductivity, but is not detrimental to plant materials for the relatively short initial startup period up to 70 percent power. Degassing of the feedwater sample to eliminate the carbon dioxide will result in a cation conductivity measurement which is indicative of only the corrosive contaminants and will not result in unwarranted corrective action or shutdowns during the startup period.
l i
3.11-2 l
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TABLE 4.1-3 MINIMUM SAMPLING FREQUENCY Item Check Frequency i
1.
Gamma Isotopic Analysis a.
Monthly
- b.
Radiochemical Analysis for Sr 89, 90 b.
Monthly
- c.
Tritium c.
Monthly
- d.
Gross Betta and Gamma Activity (1) d.
5 times / week
- Chemistry (C1, F and 02) 3.
S times / week
- e.
f.
Boron Concentration f.
2 times / week **
g.
Gross Alpha Activity g.
Monthly
- h.
5 Determination (2) h.
Semi-annually 2.
Borated Water Storage Boron Concentration Weekly
- and after T
Tank Water Sample each makeup o
3.
Core Flooding Tank Boron Concentration Monthly
- and after each makeup 4.
Spent Fuel Pool Water Sample Boron Concentration Monthly *** and after each makeup 5.
Secondary Coolant a.
Gross Beta and Gamma Activity a.
Weekly
- b.
Iodine Analysis (3) b.
Weekly
- c.
Final Feedwater Cation Conductivity c.
S times / week l****
6.
Concentrated Boric Acid Tank Boron Concentration Twice weekly *
- Not applicable if reactor is in a cold shutdown condition for a period exceeding the sampling frequency.
- Applicable only when fuel is in the reactor.
- Applicable only when fuel is in wet storage in the spent fuel pool.
0
- Sample may be degassed, sample applicable only when Reactor Coolant System temperatures is above 300 Fs b
f