ML20027E181
| ML20027E181 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/26/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20027E179 | List: |
| References | |
| NUDOCS 8211120204 | |
| Download: ML20027E181 (3) | |
Text
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t SAFETY EVALUATION AMENDMENT 10 to NPF-10 SAN ONCFRE NUCLEAR GENERATING STATION, UNIT 2 00CKET NO.
50-361 Introduction By letter dated August 16, 1982, the licensees requested a change to the San Onofre Nuclear Generating Station, Unit 2 technical specifications, specifically in 3.7.1.3, Condensate Storage Tank. This change will permit water inventury to be based on maxinun achieved power level. The change will also assure an adequate feedwat?r inventory until the installation of an autonatic level control systen is completed as a permanent solution.
Evaluation The condensate storage water inventory at San Onofre Unit 2 was des 19 Ped to provide enough feedwater for two hours of operation at hot standby, followed by cooldown to 400 7. At this tenperature, the licensees have stated that the shutdown cooling system can be used to renove decay heat after an accident.
To meet.this requirement, Technical Specification 3.7.1.3 requires that a minimum of 144,000 gallons of condensate water be naintained in the seismic Category I tank T-121.
In addition to the above requirements, during its review of the OL application for San Onofre 2, the staff required that the licensees show that sufficient feedwater was available for four hours of operation at hot standby, follnwed by cooldown to 350 7, which is the temperature at which the shutdown cooling systen is nornally placed in service. This additional requirement meets the recommendations of Branch Technical Position RSP. 5-1, and is assured by Technical Specification 3.7.1.3, which requires that a mininum of 280,000 gallons of condensate water be maintained in tank T-120, in addition to the water in tank T-121.
The volume that is required to be raintained in T-121 by the current technical specification is based on initial operation at 100% power and sufficient operation at full power to develop the naxinun arount of decay heat. During startup testing prior to operation at 100% power, the core fission product inventory will be less than that required to generate the maximum amount of decay heat.
Therefore, the feedwater inventory requirements are correspondingly lower.
The proposed change will ensure an adequate feedwater inventory in T-121 for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at hot standby followed by plant cooldown to 400 F, for the maxinun decay heat which could be present at the tine. The ninimun inventories to be maintained in tank T-121 are equal to the sun of the feedwater required for decay beat removal from standard fission product decay energies for various plant power levels and the feedwater regt:f red for cooldown to shutdown cooling entry conditions. For conservatism, a +2% uncertaintly for core thernal power, a +10% uncertainty in decay. heat and a +20% uncertainty for the nininum inventory ro m r i en d at 0" entor unem n e e nam d OFFICE)
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. In addition, the proposed change leaves intact the mininun 280,000 gallon feedwater inventory required to be maintained in tank T-120 by Technical Specification 3.7.1.3.
The inventory in T-120, when combined with the volume of feedwater inventory required to be naintained in T-121 by Technical Specification 3.7.1.3, provides an assured condensate supply sufficient to neet NRC staff criteria. Specifically, the condensate supply is enough to at hot standby for four hours followed by a cooldown at 3C0, maintain the plant F.
This is consistent with the reouf rements of Reactor Systens Branch Technical Position 5-1 (RSB BTP 5-1) as delinated in Section 5.4.7 of the Standard Review Plan.
Environnental Consideration
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We have deternined that this amendnent does not authorize a change in effluent types or total arount nor an increase in power level and will not result in any significant environmental impact. Having nade this determination, we have further concluded that this 'anendraent involves action which is insignificant from the standpoint of environmental impact, and, pursuant to 10 CFP, Section 51.5(d)(4), that an environnental inpact statement or negative declaration and environnental inpact appraisal need not be prepared in connection with the issuance of this anendment.
Conclusion Based upon our evaluation of the proposed change to the San Onofre, Unit 2 Technical Specifications, we have concluded that:
(1) because this amendment does not involve a significant increase in the probability or consequences of accidents previously considered, does not create the possibility of an accident-of a type different fron any evaluated previously, and does not involve a significant decrease in a safety margin, this amendnent does not involve a sicnificant safety hazards consf deration; (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed nanner, and (3i such activities will be conducted in conpliance with the Comission's regulations and the issuance of this amendnent will not be ininical to the con mn defense and security or to the health and safety of the public. Ve, therefore, conclude that the proposed changes are acceptable, OCT 2 01982 cated:
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SAFETY EVALUATION AMENDPENT 10 to NPF-10 SAN ONOFRE NUCLEAR GENERtJING STATION, UNIT 2 DOCKET N0 50-361 Introduction By letter dated August 16, 1982, the licensees requested a change to the k
San Onofre Nuclear Generating Station, Unit 2 technical specifications, wp4.ct".
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specifically in 3.7.1.3, Condensate Storage Tank.
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W ":ry feed =tcr,ystem The change will also assure an adequate feedwater g4Lywd inventnry until the installation ~ of an automatic level control system is completed peoe/.
as a permanent solution, g
Evaluation The condensate storage water inventory at San Onofre Unit 2 was designed to provide enough feedwater for two hours of operation at hot standby, followed 0
by cooldown to 400 F.
At this teoperature, the licensees have stated that the shutdown cooling systen can be used to remove decay heat after an accident.
To meet this requirement, Technical specification 3.7.1.3 requires that a mininum of 144,000 gallons of condensate water be maintained in-the seismic Category I tank T-121.
In addition to the above requirements, during its review of the OL application for San Onofre 2, the staff required that the licensees show that sufficient feedwater was available for four hours of operation at hot standby, followed U
by cooldown to 350 F, which is the temperature at which the shutdown cooling systen is normally placed in service. This additional requireraent meets the recorrendations of Branch Technical Position RSB 5-1, and is assured by Technical Specification 3.7.1.3, which requires that a minimum of 280,000 nallons of condensate water be naintained in tank T-120, in addition to the water in tank T-121.
The volume that is required to be maintained in T-121 by the current technical specification is based on initial operation at 100% power and suf ficient operation at full power to develop the naximum amount of decay heat. During startup testing prior to operation at 100% power, the core fission product inventory will be less than that required to generate the naximum anount of decay heat.
Therefore, the feedwater inventory requirements are correspondingly lower.
The proposed change will ensure an adequate feedwater ingentory in T-121 for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> at hot standby followed by plant cooldown to 400 F, for the maximun decay heat which could be present at the time. The ninimum inventories to be maintained in tank T-121 are equal to the sum of the feedwater required for decay heat removal fron standard fission product decay energies for various plant power levels and the feedwater required for cooldown to shutdown cooling
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