ML20085D638

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Change Request 13 to Application for Amend to License DPR-4, Revising Concentration of Gaseous Release as Measured by Radiation Monitor in Ventilation Duct Ahead of Stack Fan
ML20085D638
Person / Time
Site: Saxton File:GPU Nuclear icon.png
Issue date: 03/24/1964
From: Neidig R
SAXTON NUCLEAR EXPERIMENTAL CORP.
To:
Shared Package
ML20083L048 List: ... further results
References
FOIA-91-17 1594, NUDOCS 9110170030
Download: ML20085D638 (4)
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SAXTON NUCLEAR EXPERIMENTAL CORP 0 RATION // '

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DOCKET NO. 50-lh6 LICE!GE DPR-b Cjl -

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Change Request #13 1 ,

1. Applicant hereby submits Change Request No. 13 in compliance with paragraph 3 of License DFR-b as provided for in 10 CFR 50.59.

SAXTON NUCLEAR EXPERIMENTAL CORPORATION By /s/ R. E. Neidig President Attest:

/s/ R. E. Sypher Secretary (S E A L)

Sworn and subscribed to before me this 2hth day of March 196h.

(S E A L}

/s/ Martin A. Kohr Notary Public-Muhlenberg Township, Berks County Ny Commission Expires Feb. h, 1966 9110170030 910424

,- PUR FOIA DEKOK91-17 POR 1CoF

9 March 2h,196h '-

Docket No. 50-lh6 DPR-h Technical Specifications Change Request #13 (Page 1 of 2 pages)

1. Description of Change Change paragraph I-8 of the Saxton Nuclear Experimental Corporation Technical Specifications to read as follows:

The radioactive concentration of gaseous release as measured by the radiation monitor in the ventilation duct ahead of the stack fan, after consideration is given to any dilution occurring between the detector and the stack fan, shun not exceed the following limits:

a. A concentration of 2.73 x 10~7 uc/ce, when averaged over a year, of unidentified mixtures of radioisotopes as set forth in Appendix B, Table II, column I of 10 CFR 20 if it is known that alpha-emitters and Sr90,1129, Pb210, Ac227, Ra228, Pa230, Pu2hl and Bk2h9 are not present.
b. A concentration of 9.29 x 10-6 uc/ce, when averaged over a year, of Krypton and Xenon.
c. An instantaneous concentration of 2 x 10-3 uc/cc, when averaged over a 15-minute period.
2. Purpose of Change The existing limitation of a concentration of 2.75 x 10-7 uc/ce,as measured in the ventilation duct ahead of the stack fan, is based on not exceeding 1 x 10-10 uc/cc of air at the ground level int of maximum concentra-tion. This value restricts the allowable yearly re10am to 10h curies of a

. partially unidentified mixture of radioisotopes. The a cual gaseous release from the plant for the 12-month period ending February _29,196h was approximately 75 curies.

One of the design bases for the plant is operation with pinhole leaks in 1% of the fuel rods and during the 12-month period, above, the plant has operated with a fuel defect estimated to represent no more than 1/50 of the design basis.

Careful analyses of the gaseous activity released by both decay measure-ments and gamma-ray spectrometry indicate that essentially all of the activity has been Kr and Xe. Consequently, the purpose of this change is to provide for an additional release of these nuclides so that the allowable release is compatible with the plant design basis for pinhole leaks in 1% of the fuel rods.

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s March 2h,196h t ,

Docket No. 5c-lh6 DPR-L Technical Specifications Change Request #13 (Page 2 of 2 pages)

3. Safety Considerations The maximum permissible yearly amount of radioactivity that can be released from the site has been calculated based on Sutton's diffusion equation and Bryant and Davidson's plume rise equation as set forth in * ** 'on 103 of the Saxton Final Safeguards Report, applying the diffusion pal -s determined for the site.

The proposed change requests permission to release 3750 curies of Xe and Kr at an average yearly concentration of 9.92 x 10-0 uc/cc as measured by the radiation detector in the ventilation duct ahead of the stack fan, after con-sideration is given to any dilution occurring between the detector and the stack fan. This yearly release and associated average yearly concentration will result in a concentration, at the ground level point of maximum concentration, of only 3.59 x 10-9 uc.ce. This value is a small part of the maximum permitted, since the applie- :on of Sutton's equation, above, to a non-occupational MFC value of 3 x 10- a/cc of air for Kr85 and Xe133 results in a maximum permitted annual reles_ of approximately 300,000 curies.

The present average yearly concentration of 2.75 x 10-7 ue/cc as measured by the radiation detector in the ventilation duct ahead of the stack fan has been reduced to 2.73 x 10-7 uc/cc so that the sum of the ratios of the maximum ground level concentration to the respective non-occupational MFC for the partially identified mixture and the Kr and Xe will be equal to, or less than, unity as required by Note No.1 to Appendix B of 10 CFR 20.

In our opinion, the proposed change does not present significant hazards considerations not described cr implicit in the Final Safeguards Report.

h. Health and Safety It is our conclusion that the health and safety of the public will l

l not be endangered by this change.

Re' ad March 2h,196h 303.9 t

The rate at which the Discharge Tank water is pumped into the circulating water tunnel or the secondary cycle will be controlled manually with a flow control valve and an integrating type flow meter.

The average daily release, over a one-year period, cased on a maximum reasonable operating factor of $0 per cent for the waste treatment plant would be not more than 1.1 millicurie. This average is also based on an evapor-ator processing rate of 2 gpm, a ten-day hold up for dgcay and concentrates drunning, and a radioactivity concentration of 2 x 10- uc/cc in the Discharge Tanks. The maximum daily discharge of radioactivity possible based on full capacity of the $ gpm Discharge Tank puNg and a radioac'.ivity concentration of 2 x 10-4 ue/cc would be 5.5 millicuries. This quantity of radioactivity does ot exceed the 13 millicuries per day that can be released without exceeding background by 1 x 10-7 ue/cc.

The quantity cf water and the radioactivity concentration of the water passing through the monitoring tanks will vary widely and is difficult to estimate with any degree of accuracy. The bulk of this water will come from the lar %" and deconta nination shower and lavatory and will already be highly diluted reaches the 1200-gallon monitor tanks. This water will be sampled before sleased and if the radioactivity concentration is greater than 1 x 10-7 uc/s above background, it will be diverted to the RWDF Storage Tanks for hold-up and processing.

While the above releases are based en not exceeding background by 1 x 10-7 uc/ce, the higher radioactivity concentrations permitted by 10 CFR 20 may oe utilized if additional analytical work is performed and the presence and/or absence of certain radioisotopes can be shown. ,

c. Air-Borne Releases Air-borne radioactive gas and particulate matter will be released to the atomosphere by a 28,h00 cfm fan discharging to a 125-foot high, 32-inch diameter stack. The activity released from this stack will be essentially all gaseous since 99.95 per cent of the particulate matter will be removed by the f 1ters in the various ventilating and purge systems, f

A radiation moritor, consisting of four thin-walled Oeiger-Mueller tubes operated in parallel, is mounted in the ventilating systen duct ahead of the i stack discharge fan. This monitor system haa minimum detectable sensitivity of 2 x 10-7 uc/cc. Any radiation detected by this monitor is recorded and alarmed in the main control room.

Air-borne radioactivity releases will be controlled so that the activity concentration of the ground level point of maximum concentration, when averaged over a year, will not exceed either (1) 9.88 x 10-11 ue/cc of air of=

unidentified mixtures of radioisotopes as set forth in Appendix B, Table II, column I of 10 CFR 20 if it is known that alpha-emitters and Sr 90, i 129, l Pb 210, Ac 227, Ra 228, Pa 230, Pu 2hl and Bk 2h9 are not present; or (2) 3.59 x 10-9 uc/cc of air cf Kr and Xe. The radioisotopes excepted in (1),

above, are not present in the gases discharged by virtue of their low fission yield or non-volatility. By the application of the atmospheric dispersion criteria of Sutton as given in " Meteorology and Atomic Energy," July 1955, Appendix A, page 156, the plume rise equation by Bryant and Davidson, page 155, 103.2 curies per year of partially unidentified mixtures of radioisotopes and 3750 curies per year of Kr and Xe may be released from the Saxton stack.

In addition to the stack air radiation monitor previously -

mentioned, two air monitors are provided in the containment-vessel and two are

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