ML20125D559

Informs of Change 10 to License DPR-11,changing Min Sensitivity of Intermediate Range Channels from 10(-9) Amps/ 75 Kw to 5 X 10(-11) amps/200 Kw,Due to Problems Achieving Required Sensitivity During Low Power Operation

ML20125D559
Person / Time
Site:	05000130
Issue date:	04/28/1966
From:	Doan R US ATOMIC ENERGY COMMISSION (AEC)
To:	Mcelroy D NORTHERN STATES POWER CO.
Shared Package
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References
FOIA-85-54 NUDOCS 8506120401
Download: ML20125D559 (2)

Text

.

UNITED STATES UCENSE AUTHORITY FIL

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ATOMIC ENERGY COMMISSION g

WASHINGTON. D.C. 20545 D

m asn.vnersn m k (

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• D Docket No. 50-130

\W4 APR 2 81966

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k,.f Northern States Power Company 414 Nicollet Avenue . -

.g j Minneapolis, Minnesota (

Attention: Mr. David F. McElroy Channe No. 10 Vice President, Engineering Centlement This refers to your request dated April 18, 1966, for authorisation'of ,

a change in the Technical Specifications of Provisional Operating License -

No. DPR-11 pursuant to the provisions of Section 50.59 of the commission's '

res:ulations . The request would chan j intermediate ranee channels from 10 g the minimum sensitivity of theamos/75 Kw tol 5 x 1 l

This change has beene requested because of difficulties in achieving the presently required sensitivity during certain phases of low power operation.

We have concluded that change No. 10, as set forth below, does not present I significant hazards considerations not. described or implicit in the Final

. Hasards Summary Report, and that there is reasonable assurance that the ,

health and safety of the public will not be endangered. A copy of our related safety evaluation is enclosed.

In view of the foregoing, the Technical Specifications of License No. ,

DPR-11 (Appendix A) are hereby changed as follows:

(a) The following item is deleted from Table 1:

"(a power level of 75 Kw shall give a current indication not less than 1 x 10-9 amps)."

(b) In parts (2) and (3) of Items 6.1.8(a) and 6.1.8(b), the i words " equal to or greater than 1 x 10-9 amps" are deleted and replaced with "two range switch positions higher in i power than the selected range on which the low level trip interlock of Channels 5 and 6 is bypassed accordine to 6.1.8(c)."

(c) The last s entence of Item 6.1.8(c) is changed to read "This interlock on each channel may be bypassed for startup by switching to a selected rante on which the scram level shall 8506120401 850214 10 PDR FOIA PAY 85-54 PDR

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, Northern States Power Company \

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not exceed 200 Kw (except for tests specified in Sections 5.8.2 and 6.1.8(d)); additionally, the scram level on the highest range with such bypass'shall correspond to a current not less than 5 x 10-11 amps."

Sincerely yours, 06sulMN R.LDoan R. L. Doan, Director

. Division of Reactor Licensing

Enclosure:

AEC Safety Evaluation i

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