ML20125D554

Safety Evaluation Supporting Change 7 to License DPR-11, Authorizing 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

ML20125D554
Person / Time
Site:	05000130
Issue date:	12/20/1965
From:	Boyd R US ATOMIC ENERGY COMMISSION (AEC)
To:
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 8506120399
Download: ML20125D554 (2)

Text

,

j w .. n . (

.( SAFETY EVALUATION BY THE RESEARCH AND POWER REACTOR SAFETY BRANCH DIVISION OF REACTOR LICENSING l

IN THE MATTER OF ,

NORTHERN STATES POWER COMPANY PATHFINDER ATOMIC POWER PLANT j / uv

~

DOCKET No. 50-130 cfM C0ffrAINMENT LEAK RATE SPECIFICATION FCR POWERS BELOW l MW(t)

CHANGE NO. 7 l I

i Introduction and Evaluation i

By application dated December 13, 1965, the Northern States Power Company (NSP) requested a change in Technical Specifications to increase the presently specified containment leak rate limit. The increased limit would be the same cs that previously specified in the license for operation below 1 MW(t). We have been informed that this change was requested because measured leakage '

( was higher than specified. Until repairs can be affected plant testing will be restricted to power levels below 1 MW(t).

In Change No. 6, .the Technical Specifications were revised to permiti full power (190 MWt) operation of the Pathfinder reactor. _ One of the revised items was the permissible containment leak rate. This limit was changed from 0.21 per day for 1 MW(t) operation to 0.11% per day for . full power operation at the same test pressure. In Proposed Change No. 7, Northern States Power Company has requested an additional provision that will permit resumption of low power reactor testing at the previously specified containment leakage rate limit of 0.2% per day. This change does not involve significant hazards considerations different than previously considered since this mode of operation is the same cs previously approved.

Conclusions Based upon our review of the information submitted, we have concluded that the operation of the Pathfinder reactor in accordance with the proposed change

'does not present significant hazards considerations not described or implicit in the hazards summary report, and there is reasonable assurance that the health and safety of the public will not be endangered.

I 8506120399 B50214 PDR FOIA PAY 85-54 PDR I

m .

r

(

I

• Accordingly, we believe that a new sentence should be added to  !

Section 3.6.2 as follows:  ;

"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 3

78 psig." -

Origind signed br.

!!c:tr S. Boyd Roger S. Boyd, Chief  !

Research & Power Reactor Safety Branch Division of Reactor Licensing Date:

20 W t

S

/

. ~ , . _ . . - . - - --

, , _ _ , . _ _ _ . _ . . _ . , , , _ - , , , - , _ , , , , _ , _ . _ , . , , , - . . ,-.,,m