ML19209D079

Confirms Commitment Made to NRC at 791012 Meeting Re Submittal of License Amend Request within 30 Days to Adopt Primary & Secondary Coolant Activity Tech Specs.Forwards Interim Limit on Primary Coolant Iodine Activity

ML19209D079
Person / Time
Site:	Prairie Island
Issue date:	10/16/1979
From:	Mayer L NORTHERN STATES POWER CO.
To:	Office of Nuclear Reactor Regulation
References
TAC-12237, NUDOCS 7910190370
Download: ML19209D079 (1)

Text

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MSP NORTHERN 5TATES POWER COMPANY M I N N E A f*C L.l e. M I N N E S OTA 55401 October 16, 1979 Director of Nuclear Reactor Regulation U S Nuclear Regulatory Crwiission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Revision to Primary and Secondary Coclant Activity Technical Specifications This is to confirm that NSP committed to the NRC Regulatory Staff, at a meeting on October 12, 1979, to submit a license amendment request within 30 days to adopt primary and secondary coolant activity Technical Specifications for the Prairie Island plant. The proposed Technical Specifications will be based upon the current standardized Technical Specifications for these para -

meters, modified as necessary to conform to existing Prairie Island Technical Specification format and current operational and surveillance practices.

In the interim, NSP has committed to inplementation of the primary coolant iodine activity limits and actions contained in Attachment A to this letter.

These limits and actions will be implemented for Prairie Island Units No. I and 2 prior to return to power of Unit No. I which is currently shut down.

a o.W L 0 Mayer, PE

/

Manager of Nuclear Support Services LOM/ak cc: J G Keppler G Charnoff MPCA Attn: J W Ferman Attachment

}

7910190 3 ? p

.' 10/16/79 Attachment A PRAIRIE ISLAND NUCLEAR GENERATING PLANT Interim Limit on -Primary Coolant Iodine Activity

1. The specific activity of the primary coolant shall be limited to:

Less than or equal to 1.0 microcuries per gram DOSE EQUIVALENT I-131.

2. DOSE EQU1 VALENT I-131 is that concentration of I-131 (uci/ gram) which alone would produce the same thyroid dose as the quantity and isotopic mixture of I-131, 1-132, I-133, I-134, and I-135 actually present. The thyroid dose conversion factors used for this calculation shall be those listed in Table III of TID-14844,

" Calculation of Distance Factors for Power and Test Reactor Sites."

3. If a reactor is at or above hot standby and T is greater than or equal to 500 F: ""8 (a) Uith the specific activity of the primary coolant greater than 1.0 microcurie per gram DOSE EQUIVALENT I-131 but within the allowable limit (below and to the lef t of the line) shown on Figure 1, operation may continue for up to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> provided that the cumulative operatir.3 time under these circumstances does not exceed 800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> in any consecutive 12-month period.

With the total cumulative operating time at a primary coolant specific activity greater than 1.0 microcurie per gram DOSE EQUIVALENT I-131 exceeding 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> in any consecutive 6-month period, a special report to the Commission shall be subnitted within 30 days indicating the number of hours above this limit.

(b) Uith the specific activity of the primary coolant greater than 1.0 microcurie per gram DOSE EQUIVALENT I-131 for more than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> during one continuous time interval or exceeding the limit line shown on Figure 1, the affected reactor shall be placed in HOT STANDBY with T less than 500 F within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. ""8 Page 1 of 2 i17ra 'c) } g

. ATTACHMENT l. 10/16/79

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0 20 30 40 50 60 70 80 90 100 PERCENT OF RATED THERMAL POWER DOSE EQUIVALENT I-131 Primary Coolant Specific Activity Limit Versus Percent of RATED THERMAL POWER with the Primary Coolant Soecific Activity > 1.0gCi/ gram Dose Equivalent 1-131 1175 225 FIGURE 1 page 2 of 2