ML20024G516
| ML20024G516 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 12/14/1976 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102120589 | |
| Download: ML20024G516 (3) | |
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Docket NRC PDR Local PDR ORB #2 Reading VStello KRGoller
_j Docket No. 50-263 TJCarter DLZiemann DEC 141976 OELD j
Ol&E(3) j RPSnaider Northern States Power Company P0' Conner ATTN: Mr. L. O. Mayer, Manager RMDiggs Nuclear Support Services DEisenhut 414 Nicollet Mall - Eighth Floor TBAbernsthy Minneapolis. Minnesota 55401 JR8vchanan Gentlemen:
RE: MONTICELLO NUCLEAR GENEPATING PLANT We are reviewing your September 7,1976 submittal pertaining to operation of the Ponticello Nuc1 car Ocnerating Plarit with only one recirculation pump in operation and the ecualizer valve closed. We have determined that the additional infonnation identified in the attachnert is reoutred i
to proceed with our review. Your response is requested within 45 days of receipt of this letter.
i r
Sincerely, Orit.inal signe3 Dr i
nennis i.. zimatn Dennis L. 71emann, Chief Operating Reactors Branch f2 i
Division of Operating I,eactors l
Attachment:
Peouest for Additional Infonnation cc w/ enclosure:
/2 3 See next page z
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M R'B #2 DOR:0RB #2 RPSnaider:ro DLZiemann k / I / 'li.
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i Foran AEC.)l0 (Rev. 9-$)) AECM 0240 W v. e. oavs an= tar raintino or rec ts este.eae.ies 9102120509 761214 PDR ADOCK 05000263 p
Northern States Power Company '
7gg 3 4,77q cc w/enclosere:
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Gerald Charnof f, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 Arthur Renquist, Esquire Vice President - Law Northern States Power Company i
414 Nicollet Mall Minneapolis, Minnesota 55401 Howard J. Vogel, Esquire Legal Counsel 2750 Dean Parkway Minneapolis, Minnesota 55416 l
Mr. Steve J. Gadler c
2120 Carter Avenue St. Paul, Minnesota 55108 Mr. Kenneth Dzugan Environmental Planning Consultant Office of City Planner Grace Building 421 Wabasha Street St. Paul, Minnesota 55102 Sandra S. Gardebring, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road B2 s
Roseville, Minnesota 55113 Anthony 2. Roisman, Esquire Rotsman, Kessler and Cashdan 102515th Street, N. W., 5th Floor Washington, D. C.
20005 The Environinental Conservation Library Minneapolis Public Library 300 Nicollet Hall Minneapolis, Minnesota 55401 e-
1 I
REQUEST FOR ADDITIONAL INFORMATION MONTICELLO NUCLEAR GENERATING PLANT i
DOCKET NO. 50-263 SINGLELOOPOPERATION(E00ALIZERVALVECLOSED1
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1 1.
The idle loop startup transient has been analyzed in your FSAR from an initial power of 60%.
In NED0-21252, page 4-1, it states that
" operation with one recirculation loop results in a maximum power output which is 20 to 30% below that from (sic) which can be attained for two-pump operation." Is 60% power the most severe If initial power for the idle loop startup transient analysis?
not, revise the analysis using the most severe initial power level.
What effect will reverse flow have on jet pump vibration, specifically 2.
risers, supports, and baffle plates?
What effect will asymmetric flow have on instrument housings located 3.
in the lower plenum?
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