ML20197C637
| ML20197C637 | |
| Person / Time | |
|---|---|
| Site: | 07000048, 07001503 |
| Issue date: | 10/03/1978 |
| From: | Mechlin G WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Mcclintock R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20197C624 | List: |
| References | |
| NUDOCS 7811210148 | |
| Download: ML20197C637 (2) | |
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Aesearen and oeveicament center Westingh0USe Electric Corporatlan i3:aseuiangoao Pittscurgn Pennsyivania 15235 October 3,1978 Mr. Robert D. McClintock, Chief Materials Radiological Protection Section U.S. Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, PA 19406
Dear Mr. McClintock:
Re: License Nos. SNM 47 and SNM 1460 Inspection 78-01 Docket 70-0048, 70-1503 The following action has been taken on the two infractions listed in Appendix A of your letter of July 31, 1978 on the above referenced subject.
Infraction A_
A safety system is being installed on the Low Level Cell (Hot Cell No. 2) in the Building 302A Metallurgical Laboratory which will electri-l cally interlock the entry door opening control and prevent the door from opening when the field in the cell could result in an exposure of 100 l
millirem or higher per hour to a person entering the cell. This safety system is a duplicate of that presently on the High Level Cell. The detector head and monitor instrumentation (RD 17A and RM 16) for the safety system are on order from Eberline Instrument Corporation.
Eberline representatives informed us by phone on October > that a critical component for the RM 16 power supply is out of stock and, as a result, delivery of the instruments will be in 30 to 45 days instead of that quoted earlier.
All possible electrical work on the system will be done by October 11, and the system can be operational within two days after receipt of the monitor and detector head. We will notify you as soon as the safety system is fully operational.
Red warning lights are being installed over the entry door to the Low Level Cell and at the entry door to the air lock on the High Level Cell.
These lights will be automatically energized during the entire time period that the detector heads within the cells indicate a field that would result in an exposure of 100 millirem or higher per hour to a person entering the cell. A sign under each warning light will explain the significance of the energized light "High Radiation Level in Cell." The warning lights will be operational by October 11, 1978.
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Y g The safety interlocks on both the High and Low Level Cells will be able to be bypassed by key-operated switches, with the only copies of the keys under the control of the local area manager. The radiation monitors will be housed in locked enclosures to prevent defeat of the safety interlock by altering the monitor settings.
The keys for these housings will also be under the control of the local area manager.
Infraction B The interior of the Building 302 Hot Cell was equipped with an emergency door opening control that permits any person trapped in the cell to override any operating safety interlock on the door so as to open the cell entry door and effect escape.
This system was operational on September 28.
Similar emergency door opening controls are being installed in the interior of both the High Level and Low Level Cells in the Building 302A Metallurgical Laboratory. An emergency door opening control is also being installed in the air lock leading to the High Level Cell. These emergency opening controls will be operational by October 11, 1978.
All of the emergency door opening controls in the cell interiors are being tied in to the Building 802 Guard Station IRIS Emergency Alarm Panel which is monitored continuously. Any alarm will be investigated immediately by on-Site personnel and necessary action taken promptly. These new additions to the alarm network will be operational by October 23, 1978.
Sincerely, f
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George F. Mechlin Vice President Research and Development I
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