ML20085D168

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Advises That Fence & Gate Installed in Tunnel Adjacent to Containment Vessel to Restrict Access to High Radiation Area
ML20085D168
Person / Time
Site: Saxton File:GPU Nuclear icon.png
Issue date: 02/08/1963
From: Rees D
SAXTON NUCLEAR EXPERIMENTAL CORP.
To: Lowenstein R
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20083L048 List: ... further results
References
FOIA-91-17 NUDOCS 9110150314
Download: ML20085D168 (2)
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o , . SAA.ON NUCLEAR EXPERIMEi .fAL CORPORATION GENERAL P U B LIC UTILITIES S Y S T f" M L

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Docket No. 50-116 License DPR4

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Mr. Robert lowenstein, Dirbotcr Division of Licensing sad Rei;ulation U.S. Atenio Energy Ccamission Washington 25, D.C.

lk.ar F.r. lawensteint Faragraph 20.20)(c)(2,) of Atcaic Energy Co r:ission Regulatico 10 CFR Part 20, Standarda for Protsetion against Radiation, r+quirer that entry inte a h gh radhtien area as defirwd in the regulation shall be inctioated by a visible, or audible alarm signal. Radiation sv.rveys made during the initial high-pever operation of the Ja.xton reactor during the renthn of December 1962 and January 1963 have revesled that a high radiation level exists at power levels at or above 10 MWt in the underground tur.nel aJJ acent to the contsinment veceel, as ahcyn on the encleaed marked up print of the Gilbart Associates, Inc. drawing D-37792, writch vsa Figure 201-b of the Saxton Final Stfeguarda Report.

Accese to this area of the tunnel is not normally requirsi during plant operation at power ani as preswitly contenplated, access to this area vill only be required infrequently when the reactor is shut down. Under this condition the radiation level in this area would be such that a persoo working in this area for one hour would not receive a dose of 1rio millirara.

The measured radiation level in this area during povar operstion at 20 Wt was suh thst the dose rate was 200 mrom/hr.

The AT,C complianco inspector hao advised us that inaa.vach as certain vens incide of the contaiment vessel, such as the prime.ry co:sportment, will de nigh radiation art as when the reactvr is in or eresion, the entire contain-ment voasel or areas inside- the conta11nent vessel may ce.e ander the require-wnts of paragraph 20.20)(c)(2) of 10 GW 20. Tac 3.txten Technical Specifica-tions ;)rchibit entry into the containmnt vessel wren the reactor is in 0; eratie n. Both the main personnel accese- air locr to the coistairr.ent l vessel are kept locked by meana of a padlock and chain when the reactor l 1s in operation.

A fencc and gate are being installod in the tunnel as shwn on the (n:lesSA nukd up print, As mentioned above, the tunnel is underground

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)tr. Robert lowenstein February S. 196) and the only postible entry to the area of the tunnel in question is through the gate that is teing installed. The gate to this tunnel area vill te locked with a padlock, ard this lock ar4 the lock used for the contalment vessel access operdngs will have a commion r: Aster key that will te riaintained in the physical custody of either the Se dor Plant SuperviscTs or the Reactor Plant Supervisor on duty. In addition to administrative control of +.he key to thcae pr.dlocke, aceses to these areas will only te permitted under a work petsit if the radiation dose rat e is in excees of 2.5 r.ren/hr. We Selieve that reetricting access to these high radiation areas during power operation vil.1 cavly with the intent of raragraph ?0.203(c)(2). Strict caupliance with the wcMing of paragraph 20.20.1(c)(2) muld require tne installation of cow 3uit, wiring, evitshee, alarris or other signals resulting in con-sideratle e,xpennt which does not neoa jwitified in or 4r to c'aply with the intent of this paragreph and is not as pealtiv* a cen*.rol as locking a dcs.r or gate, in accordarce with paragraph 20.501 of hegulation 10 Cra 20, exen.ption frora paragraph 20.203(c)(2) requiring a vielble or auditle signal is requested fer the high radiation areas described in this letter on the basis that the areas will be kalt locked ard that aministrative controls as described above will be folloited. In our opinion the granting of this exsuptien will not result in an unduc hasard to life cr property and vill ensure more safety than that which would be previded by following ,

only the letter of 10 C.t 20.

Very truly yours, n_

. d. Rees, General };tnager Ziu T Attach.

00: 3. ". Wowbridge, Esquire 4..

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