ML20147E899
| ML20147E899 | |
| Person / Time | |
|---|---|
| Site: | 07000048 |
| Issue date: | 10/25/1978 |
| From: | Dipiazza R WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Singer B NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 7812210241 | |
| Download: ML20147E899 (4) | |
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THis DOCUMENT CONTAINS -
POOR QUAUTY PAGES 4 j
i Westinghouse.
Water Reactor
. PWRSystemsDvism Electric Corporation Divisions g 333 PittsburghPemsylvanla15230 j
October 25, 1978 l
1 F2D-LS&S-578 pgqcPUBUC U.
S. Nuclear Regulatory Commission Office of Nuclear Material Safety & Safeguards Division of Safeguards Washington, D.C.
20555 Attention:
Mr. Bernard Singer, Chief Radioisotopes Licensing Branch Gentlemen:
Subject:
Request for Exemption ~, License SNM-47, Docket 70-48 The Westinghouse Electric Corporation hereby requests authorization for exemption from the requirements of 10 CFR 20.203, paragraph C6, regarding the inctallation of entry control devices in the hot cell at our R & D facility at Churchill, Pa. to prevent any individual from inadvertently entering a high radiation area.
The detailed justification regarding our request for exemption is based on the use of alternative methods to accomplish the same objec-tive as the regulation, and is provided on page 9.3 of section 9.1 of our license documentation.
A copy of the applicable information is attached to this letter for your convenience.
The granting of this request will not adversely affect the health safety or welfare of the general public.
If you have any questions regarding this matter, please contact me at the above location or telephone me on (412) 373-4652.
Very truly you*s, N011p; y g/
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DiPiazza, Manager NES License Administration slw/ Attachment 6011 LW 02100 BIE 11111 03M 3^ PJ
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9.1 Radiation and Nucleonics Laboratory (continued) gy f
f the hot cell and changing the winch hook from the first source holder to the second source holder.
In addition, the winch is assigned to a particular soggge holder by locking the movable pulley into either the Cs position" or the a60 Co position" (Piaure 9.1-6), with spring-l'oa'ded ping. These operations cannot be performed using the manupulators.
Figure 9.1-7 is a schematic of the door and source cpntrol cloc-trical system.
Note that the hot cell door lif t motor can be any time to bring down (close) the door; the operated at only interruption being the door travel limit switch when the door is closed.
However, the daor's upward (opening) motion is restricted first by the requirement that a restric-ted access key is required to activate the "up" pushbutton, inter-and secondly by the necessity of having all four locks closed in the coil circuit of relay Ky.
The two independent radiation interlocks M1 and M lly closed when the radiation intensity in and are norma around the hot f
cell is satisfactory for continuous occupancy; they open when this is not so, as when one of the sources is out of its shielding container.
Placement of the sensors for Mi is shown in Figure 9.1-3. The two source holder' lid and M 2 two switches are mounted adjacent the cavitics of tne shielding containers, and the switch arms are activated during the last inch or so of travel as the source holder is lowered into its cavity.
Thus the personnel door cannot be opened if either source holder is not seated, or if the radiation interlocks are activated.
In addition, the rad-intion warning lights will come on, and the door between the hot cell area and the adjacent chemistry Lab will be locked to persons in the Chemistry Lab.
The doo r's being down establishes the initial condition for use of the radiation cources inside the hot cell:
one pole of the door travel limit switch removes power from the coil the contact of which then makes power available of relay K9, to the lock control pushbutton (and which turns on the "down" door position light).
Then if the Chemistry Lab Door in-(with attached radiation warning sign) terlock contacts and the operator has secured the have been plugged in, second restricted access key, power may be applied to the electronic combination lock.
If the proper sequence of pushbuttons has been activated, this lock will in turn apply power to the chosen lock colonoid which releases the source.
Manual operation of the winch then brings up the source for use.
Poac 9 3 Dwhc0 70-48 Dalc:
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Patch Panel r
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. Circuit shown for conditions of power applied, door up, radiation interlocks closed.
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and source holders in shields.
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L1=it Switch Push Buttons
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Lights 6
Interlocks
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7 Comon Door Lock Solenoid Warning
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