ML19339B375
| ML19339B375 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 06/06/1961 |
| From: | Case E US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19339B374 | List: |
| References | |
| NUDOCS 8011060827 | |
| Download: ML19339B375 (1) | |
Text
s DOCKET NO. 50-29 HAZARDS ANALYSIS BY THE RESEARCH AND POWER REACTOR SAFETY BRANCH DIVISION OF LICENSING AND REUIATION IN THE MATTER OF YANKEE ATOMIC ELECTRIC COMPANY PROPOSED CHANGE NO. 3 Pursuant to the provisions of paragraph 3A of License No. DPR-3, as amended, Yankee Atomic Electric Company has requested authorization of proposed Change No.
3, dated Febrvary 21, 1961. This change would permit the installation of a vent I~
system from the distillate accumlator tank in the radioactive waste disposal y
system. Installation of such a system was found to be advisable during initial performance checks of the waste disposal evaporator when it was discovered that a certain amount of dissociation of the water being evaporated was tMng place.
Yankee has proposed that the distillate accumlator tank be vented through a vent condenser and a vent scrubber to the inlet side of the purge and ventilla-tion fans which discharge to the primary vent stack. The drain from the vent condenser would pass through a steam lift trap and then return to the waste disposal evaporator. In addition, Yankee has requested permission to install a connecting line from the gas stripper vent line to the proposed vent line from the distillate accumlator tank.
Upon review of the information submitted in regard to the proposed change, we were concerned over the possibility of an explosive recombination of the hydrogen and oxygen in the vent system. Accordingly, Yankee was requested to furnish l-additional data relative to this problem; these data were subsequently submitted i
in a letter to the Comission dated May 22, 1961. In this letter, Yankee presented information demonstrating that hydrogen and oxygen in the presence of
[
water vapor are not flammable unless the total volume per cent of the hydrogen plus oxygen is considerably in excess of 23 per cent of the mixture. The temperature of the outlet from the vent condenser will, therefore, be controlled so as to maintain a mixture of 23 volume per cent or less of hydrogen and oxygen combined with at least 77 volume per cent of water vapor. The temperature of the gaseous mixture in the system will be kept between 2000F and 220 F 0
through use of electrical trace heating and thermal insulation in order to pre-vent re= oval of water vapor from the mixture through condensation.
Based on our review of the information submitted by Yankee in regard to this proposed change, we have concluded that the modifications proposed will con-tribute to safer operation of the facility, and that these changes do not j:
present significant hazards considerations not described or implicit in the license application. We have further concluded that there is reasonable assurance that the health and safety of 1.he public will not be endangered by cperation of the facility as proposed.
Edson G. Case, Chief Research and Power Reactor Safety Branch D.ter RN 6 M
Division of Licensing and Regulation 801106*O b 2 x