ML20128B353
| ML20128B353 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/03/1971 |
| From: | Knotts J US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Merritt G MINNESOTA, STATE OF |
| Shared Package | |
| ML20128B357 | List: |
| References | |
| NUDOCS 9212030634 | |
| Download: ML20128B353 (2) | |
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4 DRL Reading Docket No. 50-263 JUN 3 19 71 Ksecf MMMann CLHonderson i
SHanauer HShapar PAMorris l
JKnotts Mr. Grant J. Merritt RBoyd j
G rtte Executive Director, State of i
Co Minnesota Pollution Control Agency Com. Johnson 717 Delaware Street, S.E.
Comm. Larson Minneapolis, Minnesota 55440 Secretariat (2)
Chairman
Dear Mr. Merritt:
'DP, This is in response to your May 19, 1971 request for' information regarding emergency core cooling systems and the Monticello-Nuclear Power Plant.
As noted in my May 19, 1971 letter to Mr. Kenneth Dzugan, and fol-lowing my phone conversation with him, copies of the_
Novembe r, 1970-Ma rch, 1971 Monthly Reports of the Nuclear' Safety Program Division of the Idaho Nuclear Corporation have been transmitted to _ Mr. Dzugan.
These reports con-cern the recent blow-down toots conducted in the semi-scale experiment at the National Reactor Testing Site in Idaho, which have to do with performance of emergency core cooling systems (ECCS).
I an enclosing answers to your numbered questions as prepared. by the - Division of Reactor Licensing.
In addition,- I-am _also enclosing a copy of the Commission's statement regarding-the current AEC Regulatory Staff review of recently developed information on emergency core cooling systems for nuclear power. plants.
You will note that the review of this recent information is not--
regarded as the type of problem requiring the shutdown of operating nuclear power plants.
I will be glad to send you the conclusions of this review when complete.
Sincerely,-
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4 ANSWERS TO QUESTIONS RAISED BY MR. GRANT J.
MERRITT 1
Are there presently any operating licensed pressurized water reactors using ECCS?
Yes.
Some examples of presently operating licensed pressurized water reactors using ECCS are the Hochester Gas and Eicctric Company's Ginna plant, the Carolina Power and Light Company's H. D. Robinson Unit 2 and the Wisconsin Electric Power Company's Point Beach Unit 1.
2 Have any tests of ECCS been made for boiling water reactors under operating conditions?
If so, pleaso provido details.
Yes.
Numerous tests of many kinds have been con-ducted regarding emergency core cooling systems and their performance under a wide variety of experi-mental conditions, including those postuinted to occur at the time of a loss-of-coolant accident, for boiling water reactors as well as for pressurized water-reactors.
Details of these experiments and tests are voluminous.
They have been carried out over many years and are described in many Idaho Nuclear Corporation, General Electric, Westinghouse and other reports.
References may be found in Nuclear Science Abstracts and useful summaries are provided from time to time in the Commission's publication, "Nuclohr Safety".
3.
What is the applicability of the recent ECCS-tests to boiling water reactors such as the one at Monticello, Minnesota, operated by Northern States Power Company?
I assume your reference is to the semi-scale blow-down tests recently conducted in Idaho, which are described in the reports I-have sent to Mr. Dzugan.
These tests have almost no applicability to boiling water reactors such as the one at Monticello, Minnesota.