ML20024G083
| ML20024G083 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 08/23/1976 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102070516 | |
| Download: ML20024G083 (4) | |
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Docket NRC PDR Local PDR AUG 23 l!PS ORB #2 Reading j
VStello
,j Docket No. 50-263 XRGoller N
Dross-if TJCat:er V
'N RMDiggs Morthern States Power Compeggy RPSnaider ATTN:
W. L. O. Mayer, Manager JGuibe.at Muclear Suppcet services OELD 414 Mice 11et Mall - Eighth Floor OIAE-(5)
Minneapolis. Minnesota 55401 DEisenhut'
,y TBAber1m thy Gentlemen:
JRBuchanan ACRS(16)
RE: MONTICELLO NUCLFAR GENERATING PLANT We have completed our review of your June 7,1976 and July 30, 1976 letters concerning the potential LPCI deficiency (loss of pump (s) due to cavitation and/or motor overload during pump runout conditions following a loss-of-Coolant Accident) and have determined that additional information, as described in Attachment 1 is necessary.
You are requested to sutait the requemd infonnation within 30 days of receipt of this letter.
One signed original and 39 copies of your answer should be provided.
Sincerely, "o MS*
a l@lNfs' L. Ziemann, Chief
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Operating Reactors Branch #2 Division of Operating Reactors i
Attactinent:
1 Request for Additional hfonvtion ce;w/ enclosure:
See next page 9102070516 760823 DR ADOCK 0500 3
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-Northern States Power {ppany 2
1 AUG 231976.
cc w/enclosurc:
nu Gerald Charnof f, Esquire
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Shaw, Pittman, Potts and TroMaridge 1800 H Street, N. W.
V Washington, D. C.
20036 j
-c Arthur Renquist, Esquire 4
- d Vice President - Law j
.;m g' Northern States Power Company g
414 Nicollet Mall Minneapolis, Minnesota 55401
- g. j Howard J. Yogel, Esquire Legal Counsel 9
t 2750 Dean Parkway
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Minneapolis, Minnesota 55416 i
Hr. Steve J. Gadler 2120 Carter Avenue St. Paul, Minnesota 55108 1
D6niel L. Ficker, Esquire aj l
Assistant City Attorney Criminal Division
- I 638 City Hall 2
l St. Paul, Minnesota 55102 t'
Mr. Kenneth Dzugan j
Environmental Planning Consultant i
Office of City Planner ii Grace Building 421 Wabasha Street St. Paul, Minnesota 55102
,f e
ps-Sandra S. Gardebring, Esquire
, Q.
Special Assistant Attorney General s
f Minnesota Pollution Control Agency r:
1935 W. County Road 82 ll-Roseville, Minnesota 55113 f
Anthony Z. Roisman, Esquire
- h Roisman, Kessler and Cashdan pt 1712 N Street, N. W.
- i..
Washington, D. C.
20036 1
F The Environmental Conservation Library
,b Hinneapolis Public Library 300 Nicollet Hall Hinneapolis, Minnesota S5401 s.
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r ADDITIONAL INFORi% TION REQUIREMENTS - LPCI RUNOUT _
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MONTICELLO i
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y What break location was assumed when evaluating the maximum 1) j flow possible from two LPCI pumps pumpir.g directly to a break?
Describe how the system losset were calculated, including a 3
f sketch of the system assumed and a tabulation of the head loss in feet for each component in the system (valves, orifices, heat exchangers, etc.).
Describe the NPSH available ( ANPSH) to the LPCI pump for the 2) f worst pump configuration (single failure resulting in highest pump flow) as a function of time, both short-tem and long-tem, in the event of a postulated loss-of-coolant accident.
Suppression pool temperatures versus time should be indicated and the effect of pool temperature should be included in the calculation.
Provide the required NPSH (RNPSH) vs time for a postulated LDCA with 3) the worst pump confif,uration (single failure resulting in highest Based on a-pump flow) for both short and long tem cooling.
recirculation line break at the flange where LPCI piping connects I
to the recirculation loop, if at any time RNPSH (this question) >
ANPSH (question 2), then provide either a justification that cperator action can be expected before this tir:e, or provide a complete description of any tests perfomed by you or the pump manufacturer to demonstrate that the RHR pumps can operate af less than recommended The description design NPSH conditions without sustaining damage.
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should include the test procedures, the test points, and data taken at each point, i.e. pump flow, pump suction pressure,
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pump discharge pressure, vibration, water temperature; 4
Give operating times (estimated if not recorded) over which
,j Include the pumps operated at less than design NPSH.
obs'ervations concerning pump vibration, noise, and cavitation during the tests.
t Following a LOCA, what indication of RHR pump flows would the 4)
What indications would the operator have,in the control room?
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What operater have to know that the RHR pumps were cavitating?
action could be taken to alleviate such operation, and how long would such action take?
Specify the number of pumps sssumed to be available in your 5)
ECCS Appendix K Long Tem analysis.
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