ML19309B579
| ML19309B579 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/04/1980 |
| From: | Wilson R METROPOLITAN EDISON CO. |
| To: | Jay Collins NRC - TMI-2 OPERATIONS/SUPPORT TASK FORCE |
| References | |
| TLL-103, NUDOCS 8004040321 | |
| Download: ML19309B579 (2) | |
Text
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u Metropolitan Edison Company f {')
Post Office Box 480 Middletown, Pennsylvania 17057 L
717 944 4041 Writer's Direct Dial Number Pbrch 4, 1980 TLL 103 TMI Support Attp:
J. T. Collins, Deputy Director U. S. Nuclear Regulatory Commission c/o Three Mile Island Nuclear Station Middletown, Pa.
17057
Dear Sir:
Three Mile Island Nuclear Station, Unit II (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 TMI-II, No. 2 Personnel Air Lock Contamination Control Facility Design Description This is in response to the comments in your letter of January 30, 1980 (NRC/TMI-80-017):
Comment
"'ermanent area radiation monitors and portable room air radiation mcnitors with audible alarms should be installed in hot instrurent repair shop, decontamination room, and/or air lock ante room to continuously monitor radiation levels in the area to alert the operating personnel."
Response
An Eberline radiation monitor is installed in the ante room and it monitors particulate, iodine and noble gas activity inside the
- 2 personnel air lock. A Victoreen radiation monitor is installed in the ante room and it monitors particulate, iodine and noble gas activity in the ante room. Portable survey instruments will be located in the hot instrument shop decon room and in the hot instrument shop to indicate any increase in dose rate from K-85 gas.
All of the radiation mo.iitors will have audible alarms.
Comment "The leaktight dampers in the main supply and exhaust ducts serving the facility should be tested for leaktightness during installation and/or flow testing period."
s 8004040 321
)
M' March 4, 1980 J. T. Collins TLL 103
Response
The dampers were characterized in the Facility Design Description as tight shutoff, indicating that the dampers are provided with blade and j amb seals, rather than "leaktight."
The isolation dampers atop air flow to the facility to prevent pressurizing the facility in the event of partial f ailure of the ventilation system. By preventing pressurization of the facility, exfiltration of airborne particulate contamination out of the facility through doorways, etc. is prevented.
The damper leakages could be up to at least 5 percent of rated air flow without causing any pressurization of the facility.
Since the dampers used for the facility come from a model line with prototype leakage of approxi-mately 1 percent of rated flow, no testing is deemed required.
We believe the above responses satisfy the intent of your comments.
Sincere y, T.
R. F. Wil on Director, TMI-II RFW:SDC: hah cc:
R. Vollmer e
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