ML20024G330

Forwards Annual Rept of Primary Coolant Leakage to Drywell

ML20024G330
Person / Time
Site:	Monticello
Issue date:	02/17/1975
From:	Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9102110308
Download: ML20024G330 (3)

Text

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% _ .- n e NORTHERH STATE 8 POWEH COMPANY M I N N E A f* O M S . M 8 N N E S O A.Baf Of Feb ruc ry 17, 1975 h Q[,. s I

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Mr. A. Giambusso, Director k f L .' 13/5 & 3 Division of Reactor Licensing 3 g3., 4;  ; FEB20 875 s-U S Nuclear Regulatory Commission i via nolid v E' 41 N .uu O Washington, DC 20555 f mu m 6 p gga (o 6/  % * * * //

Dear Mr. Giambusso:

cn / D MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Annual Report of Primary Coolant Leakage to Drywell i

This report is submitted in accordance with Section 6.7.C of Appendix A, Technical Specifications, of the Provisional Operating License for the Monticello Nucicar Generating Plant. It is a summary of coolant to dryvell leakage rate measurements for the period of January 1 through December 31, 1974.

Dryvell leakage is broadly classified as being from identified or unidenti-fied sources. Identified leakage is piped from the rectruciation pump seals, various valve stem leak-offs, the reactor vessel flange Icak-off, bulkhead drains, and vent cooler drains to the drywell clvsed tadwaste sump. All other leakage is collected in the drywell open radwaste sump and classified as unidentified leakage. Dryvell leakage is calculated daily using flow integrators installed in the pump discharge line of each sump. Accuracy of measurement is bette r than + 37.. Drywell leakage is also continuously monitored by the plant process computer using changes in open and closed drywell radwaste sump level sensed by special level transmitters installed for that purpose.

Sensitivity of this system to coolant leakage changes is better than 0.4 GPM.

TableI is a auunary of drywell coolant Icakage measurements for 1974. As noted in the Tc.ble, all leakage remained well below the Technical Specification Limits of 5 GPM for unidentified Icakage and 25 GlM for total leakage.

Yours truly, L 0 Mayer, PE Manager of Nuclear Support Services lam /DMM/yb

, cc: J G Keppler l G Charnof f Minnesota Pollution Control Agency

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R1]Jf Table I Summary of Coolant Leakage to Drywell-1974 l l

l Leakage from Unknown Sources (Gni) Total Leakage (Gat)

Leakage from Known Sources (GM4) Rema rk s Highest Lowest Avg Highest Lowest A3 Month Highest Lowest A3 I

0.65 0.25 5.47 2.82 3.38 JAN 5.34 2.44 3.13 0.0 3.13 0.40 0.0 0.15 3.70 2.28 3.28 FEB 3.70 2.40 2.32 3.53 Refueling outage 2.32 3.35 0.82 0.0 0.18 4.49 MAR 3.84 --- --- --- --- ---

March 16 - May 17 APR ---

0.06 1.07 0.13 0.0 0.04 2.32 0.06 1.10 MAY 2.19 0.04 1.92 0.38 1.36 JUN 1.79 0.26 1.32 0.13 0.0 0.90 1.43 0.24 0.0 0.10 2.93 0.90 1.53 JUL 1.85 1.80 1.17 1.47 1.69 1.17 1.38 0.25 0.0 0.09 AUG 2.20 2.10 1.29 1.42 0.20 0.0 0.07 1.28 1.49 SEP 1.15 1.31 0.18 0.0 0.07 1.53 1.26 1.38 OCT 1.46 1.54 Nov 1.44 0.13 0.95 0.25 0.0 0.04 0.13 1.00 1.10 1.22 0.47 0.0 0.07 1.76 1.10 1.29 DEC 1.31 5.34 2.44 1.79 0.82 0.0 0.10 5.47 0.06 1.89 YEAR (16.4%*) (2.0%*) (21.9%*) (7.6%*)

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