TS 3/4.11 — Radioactive Effluents
Most original TS 3/4.11 specifications have been deleted and relocated to the Offsite Dose Calculation Manual (ODCM) and other programs. The remaining active specifications are:
3/4.11.1.4 — Liquid Holdup Tanks
*Tanks included: outdoor temporary tanks not surrounded by liners, dikes, or walls capable of holding tank contents, and that do not have overflows/drains connected to the liquid radwaste treatment system.
Applicability: At all times
Actions:
| Condition | Required Action | Completion Time |
|---|---|---|
| Radioactive material in any tank exceeds 10 curies | Immediately suspend all additions to the tank; reduce contents to within limit | Immediately; 48 hours to reduce |
LCO 3.0.3 not applicable.
Surveillance Requirements:
| SR | Requirement | Frequency |
|---|---|---|
| 4.11.1.4 | Analyze representative sample of tank contents to verify within limit | Per SFCP, when radioactive materials are being added |
(Amendment No. 282)
▶ Bases — 3/4.11.1.4 Liquid Holdup Tanks
The tanks included in this specification are all outdoor tanks that are not surrounded by liners, dikes, or walls capable of holding the tank contents, and that do not have tank overflows and surrounding area drains connected to the liquid radwaste treatment system.
Restricting the quantity of radioactive material in these tanks to ≤ 10 curies (excluding tritium and dissolved/entrained noble gases) provides assurance that in the event of an uncontrolled release of the tanks’ contents, the resulting concentrations would be less than the limits of 10 CFR Part 20, Appendix B, Table II, Column 2, at the nearest potable water supply and the nearest surface water supply in an unrestricted area. (Amendment No. 215)
3/4.11.2.5 — Explosive Gas Mixture
Applicability: At all times*
*Not applicable to portions of the Waste Gas System removed from service for maintenance, provided those portions are isolated and purged of hydrogen to <4% by volume.
Actions:
| Condition | Required Action | Completion Time |
|---|---|---|
| Oxygen >2% but ≤4% by volume | Reduce oxygen concentration to ≤2% | 48 hours |
| Oxygen >4% by volume | Immediately suspend all additions of waste gases; reduce oxygen to ≤2% | Immediately |
LCO 3.0.3 not applicable.
Surveillance Requirements:
| SR | Requirement | Frequency |
|---|---|---|
| 4.11.2.5 | Continuously monitor oxygen in waste gas holdup system with oxygen monitor | Continuous |
| (alt) | If oxygen monitor inoperable: grab samples analyzed within 4 hours | Per SFCP |
(Amendment No. 282)
▶ Bases — 3/4.11.2.5 Explosive Gas Mixture
This specification ensures that the concentration of potentially explosive gas mixtures in the waste gas holdup system is maintained below the flammability limits for hydrogen and oxygen. Maintaining the oxygen concentration below the specified values provides assurance that releases of radioactive materials will be controlled in conformance with General Design Criterion 60 of 10 CFR Part 50, Appendix A.
The 2% oxygen limit provides margin below the lower flammability limit for hydrogen-oxygen mixtures, preventing formation of an explosive gas mixture. Hydrogen in the waste gas system is produced by radiolysis of reactor coolant water.
This specification is not applicable to portions of the Waste Gas System removed from service for maintenance, provided those portions are isolated from sources of hydrogen and purged of hydrogen to less than 4% by volume. (Amendment No. 243)
View Tech Spec PDF | View Bases PDF
Connections
- Related systems: Waste Gas
- Related concepts: Radiation Monitoring