ML20125D551

Informs of Change 7 to License DPR-11,permitting Continued Operation of Reactor at Power Levels Up to 1 Mwt W/Containment Leak Rate Not to Exceed 0.2% Per Day at Test Pressure of 78 Psig

ML20125D551
Person / Time
Site:	05000130
Issue date:	12/20/1965
From:	Doan R US ATOMIC ENERGY COMMISSION (AEC)
To:	Mcelroy D NORTHERN STATES POWER CO.
Shared Package
ML20125A538	List: ML20125D123 ML20125D151 ML20125D175 ML20125D208 ML20125D224 ML20125D241 ML20125D271 ML20125D310 ML20125D324 ML20125D333 ML20125D352 ML20125D364 ML20125D385 ML20125D404 ML20125D418 ML20125D526 ML20125D534 ML20125D541 ML20125D545 ML20125D551 ML20125D554 ML20125D559 ML20125D561 ML20125D563 ML20125D567 ML20125D571 ML20125D582 ML20125D587 ML20125D595 ML20125D618 ML20125D671 ML20125D691 ML20125D706 ML20125D718 ML20125D736 ML20125D760 ML20125D771 ML20125D787 ML20125D800
References
FOIA-85-54 NUDOCS 8506120398
Download: ML20125D551 (2)

Text

'

-_. tk *

.(-

UNITED STATES RENSE AUTHORITY FILE COPt

( ATOMIC ENERGY COMMISSION WASHINGTON, D.C. 20545 g Rdt\k i

DEC'S 01l165 3 Docket No. 50-130 i

uf -

g, Northern States Power Company 414 Nicollet Avenue Minneapolis, Minnesota ,

Attention: Mr. David F. McElroy Change No. 7 Vice President - Engineering Gentlemen:

By application dated December 13, 1965, the Northern States Power Company requested authorization of a change in Technical Speci-fications to License No. DPR-11. This request would permit continued

( operation of the reactor at power levels up to 1 MW(t) with a containment leak rate not to exceed 0.2% per day at a test pressure of 78 psig. This value of leakage rate was the specified limit when the maximum licensed power was specified as 1 MW(t) . A lower containment leakage rate of 0.11% per day is specified in the Technical Specifications for full power operation.

We have been informed that this change was requested because the results of a recent containment leak rate test conducted prior to increasing power level above 1 MW(t) indicated a leakage rate in excess of 0.11% per day. Accordingly, this change would permit continuation of low power reactor testing at the previously specified containment leak rate of 0.2% per day.

On the basis of our review we have concluded that Change No. 7 does not present significant hazards considerations not described or implicit in the hazards summary report and that there is reasonable assurance that the health and safety of the public will not be endangered. A related Safety Evaluation is' attached.

8506120398 850214 PDR FOIA PAYB5-54 PDR a

h ,

l l

i

t . -

(

(

i Northern States Power Company DEC 2 0 E5 Accordingly, an additional sentence is hereby added to Section 3.6.2 as follows: 3 "During initial operation of the reactor at power levels ,

up to 1 MW(t), the containment leakage rate shall not

)

exceed 0.2% of the contained air within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at .

78 psig."

l This confirms my teletype to you dated December 13, 1965.

t Sincerely yours, ognsM j R.L D08 {

R. L. Doan, Director Division of Reactor Licensing

Enclosure:

Safety Evaluation Distributton Doe. Room Forest suppl.

DEL Readias R&PRSE Reading oristaster: BRauth C. Henderson E. Q. Case N. shaper i L. Earnbitth (2)

n. staaer R. Haard C. Fa3e B. Skovholt

..Jinks (4)  !

W. 3. Manon ,

T. WooJard s M. J. McAlduff, ORO E. 5. Trommel, IF R. Leith, OC j l

l DEL 000 M DEL DEL i sRauth/ ten Esseyd soces. RLoesa j

( 12/16/65 12/ /65 12/ /65 12/ /65 12/ /65

.