ML19318C125
| ML19318C125 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 06/10/1980 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-05, IEB-80-5, WYRC80-63, NUDOCS 8007010057 | |
| Download: ML19318C125 (2) | |
Text
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fn Telephone 617 366-9011 710-390-0739 YANKEE ATOMIC ELECTRIC COMPANY s.a.1.1
.m, hTR 80-63 R
20 Turnpike Road Westborough, Massachusetts 01581
,Ya,uxss h*
JLine 10, 1980 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Mr. Boyce H. Grier, Director
References:
(a)
License No. DPR-3 (Docket No. 50-29)
(b) USNRC Letter to YAEC dated March 10, 1980
Dear Sir:
Subject:
Response to IE Bulletin 80-05 As requested in Reference (b), all plant systems that have low pressure or hold-up tanks that could contain primary system water have been reviewed to ensure adequate protection against vacuum conditions.
There are two systems that have such tanks:
1.
Safety Injection System 2.
Radioactive Waste Disposal System In the Safety Injection System, the " safety injection tank" holds 125,000 gallons of 2200 PPM borated water. After a safety injection signal has tripped the system and the tank has been emptied, the tank is valved out and the fluid it recirculated, bypassing the tank.
A vacuum condition in this tank is prevented by a 3" locked open vent to the atmosphere on the top of the tank. ' The tank also would not overflow because of an overflow line that is piped to the waste disposal building floor drain.
The Waste Disposal System is comprised of a liquid collection and processing system, and a waste gas system.
The liquid collection consists of two types of liquids: hydrogenated and oxganated.
To prevent explosive mixtures from forming, these two gases art segregated. Hydrogenated water comes from those systems which are associated directly with the main coolant system.
Oxygenated water comes from the vapor containment drain tank and system drainage outside of the vapor container.
Tun 7019 ' ON
a 8
U. S. Nus1rce R:gulottry Commicsion Juna 10,1980 Att:nticn:
Mr. Boyca H. Grise, DirJctor Pigs 2 i
Hydrogenated liquid is collected in a 7500 gallon " primary drain collecting tank" and is pumped to the " waste hold-up tank" or " activity dilution decay tank" (each 75,000 gals.) where it is stored until processing in an evaporator.
^ (genated liquid is collected in both a 484 gallon
" primary building x.p tank" and a 4700 gallon " gravity drain tank".
Water from these tanks is supplied to the evaporator for processing.
The primary drain collecting tank, waste hold-up tank, and the activity dilution decay tank are connected in common by the waste gas / cover gas system. The system protects the tanks from vacuum conditions by way of a water loop in the system. Each tank vent path contains a manual.ocked open isolation valve to preclude inadvertant closure.
There are two rubber lined " monitored waste tanks" in the oxygenated liquid collection system, but are not used and are valved out of service.
The above discussion has identified those tanks that are used for low pressure process or hold-up purposes.
The tanks are adequately protected against vacuum conditions by wa' of their vent systems and are not considered to pose a problem.
We trust this-information is satisfactory; however if you have any questions, please contact us.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY
.b.
D. E. Moody Manager of Operations JAK/sec l