ML19312D078
| ML19312D078 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/26/1980 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003190765 | |
| Download: ML19312D078 (8) | |
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UNITED STATES
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. NUCLEAR REGULATORY COMMISSION
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WMMNG TON, D. C. 20555
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FEB 2 6 i983 Docket Nos.:
50-329/330
' APPLICANT:
l Consumers Power Company
[
FACILITY:
~ Midland Plant, Units 1 and 2
SUBJECT:
'SUMARYOFFEBRUARY 20, 1980 MEETING ON COMPUTER CODES FOR STAFF AUDIT. ANALYSIS ON B&W SYSTEM SENSITIVITY On February 20, 1980 the NRC. staff met in Lynchburg, Virginia Jith Consumers Power Company (the applicant) and Babcock & Wilcox (B&W). The meeting was held to obtain information which the staff needs to perform audit calcula-tions on B&W System Sensitivity. The staff will audit the overcooling
, analyses in the applicants' December 4,1979 letter responding to the ttaff's CFR 50.54(f) requests of October 25, 1979. Meeting attendees are listed in Enclosure 1. '
The discussions included a description of the B&W computer codes MAXI-TRAP and MINI-TRAP, including noding schemes and flow path descriptions which are
. illustrated in Enclosure 2.
Staff audit calculations will be performed with RELAP, Mod 5 or 7 andia^ discussion of inputs for the different codes was
. made. The applicant also ' described principal systems of the Midland design acting for the following transients or accidents: main feedwater overfeed,
. steam pressure regulator failure, feedwater temperature reduction due to heater bypass or failure, loss c,f offsite power. and steam line break. Some T
of the studies for potential changes to the Midland design mentioned in the applicant's December 4,1979 letter have not yet progressed to the point that precise simulation in the ccmputer model is possible at this time.
- Nevertheless, the' benefits of various protective measures (or the adverse "t
effects of operator errors of' omission or commission, or of mechanical failures) can be examined. The staff may also perform benchmark calcula-tions with RELAP based upon' operating; data from overcooling transients such as the. Davis Bessee or the SMUD "lignt bulb" events.
2: u N..; >
D. S. Hood, Project Manager Light Water Reactors, Branch No. 4 Division of Project Management
Enclosures:
1.
Attendees List 2.
Handouts
,cc: See next page,
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8003190 % T
s 2 Consumers 1 Power Company.
- CCs*
Michael I. Miller, Esq.
Mr. S. H. Howell Isham, Lincoln & Beale Vice President
-Suite 4200~
Consumers Power Company One First National Plaza 212 West Michigan Avenue Chicago, Illinois 60603' Jackson, Michigan. 149201 Judd L.-Bacon, Esq.
- Managing Attorney
' Consuners Power Company
- 212 West Michigan Avenue
- Jackson, Michigan _ 49201 l Mr. Paul _ A. Perry Secretary..
- Consumers Power Company.
212 W. Michigan Avenue Jackson, Michigan'49201 Myron M. Cnerry, Esq.
One IBM Plaza Chicago, Illinois 60611 Mary Sinclair 5711 Summerset-Orive Midland, Michigan 48640 Frank J. Kelley, Esq.
Attorney' General Sta*.e of Michigan _ Environmental Protection Division 720 Law Guildina Lansing, Michigan 48913 Mr. Wendell Marshall Route 10 Midland, Michigan 48640 Grant J. Merritt, Esq.
Thompson, Nielsen,-Klaverkamp & James 4444 IDS Center 80 South: Eighth Street Minneapolis, Minnesota; 55402 Mr. Don van Farowe, Chief Division of Radiological Health Department of Public Health P. O. Box 33035..
Lansing,' Michigan 48909 Resident Inspector / Midland NPS.
c/o U.S. Nuclear Regulatory Commission P.LO.~ Boxil927 Midland,-Michigan 48640-E p
y
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- ENCLOSURE 1
-ATTENDEES LIST 4
' MEETING OF-FEBRUARY 20,.1980 Consumers' Power Company
-NRC~
-M.'Salerno~,
W. Jensen-
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J..Zabritski
. J. Guttmann N. Wagner-D. Hood l Babcock & Wilcox-R.-Vosburgh
.A. Gharakhari
.B. Andrews-R. Reed J..Howard-t EJ. Shively A.' Lazar sJ. Agar
-G.' Geissler 1
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ENCLOSURE 2 TABLE 3-1 MAXI-TRAF s0DE AND PATH DESCRIPTION l
i I
- Node Number:
Descriotion I
Reactor Vessel Lower Plenum 2
Core, Upper Plenum and Outlet No::zles 3',16 Hot Leg Piping 4-13, 17-26 Primary, Steam Generator 14, 27 Cold Leg Piping 15
. Reactor Vessel Downcaner.
i 28, 55, 56 Pressurizer 29 Containment 30-39, 40-49 Secondary, Steam Generator
, 50,51 Steam Risers
- 53. 54, 68, C9 Steam Generator Downcomer 64, 66 Feedwater Piping-63 Turbine and Process Steam Plant 65, 67 Feedwater Piping and Feedwater Heater
- 52,57-62 Steam Piping t
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TABLE 3-1 (Cont'd)
Flow Path Number-Description 1
Core
-2 Core Bypass 3, 4, 17, 18 Hot Leg Piping 5-13, 19-27 Primary, Steam Generator
~
-14, 28 RC Pumps
- 15.-25 Cold Leg Piping l
16 Reactor Vessel Downcomer 30 Pressurizer Surge Line 31-39, 41-49 Secondary.- Steam Generator 40, 50 Steam Riser 51, 52, 56, 69, 70, 71 26 Inch Steam Piping 53, 58 Aspirator-
'54, 55, 85, 86 Steam Generator Downcomer 59-62 Pressurizer
~
63, 66 Feedwater Pumps 64,\\65,i67, 68 Feedwater Piping 72.
36 Inch Steam Piping-73, 76 MSIV 74,~75, 77, 78 Process Steam and Turbine Piping 79-Feedwater Piping Cressover
- 80 Steam Piping Crossover 57,~84 Break-83 Aux. Feedwater L
81 HPI 82'
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I MINI-TRAP NODE AND PATH DESCRIPTION 1
Node-Number-
-Description-
.1:
-Reactor Vessel,-Lower Plenum J2
~ Reactor Vessel, Core
' 3 :-
Reactor Vessel,~ Upper Plenum
-4, 10
. Hot Leg Piping'(including " Candy Cane")
" Candy; Cane" and-Upper.'S.G. Shroud
- 32,133 Primary, Steam' Generator. Tube Region 5.-7, 11-13
' 8, 14
. Cold. Leg Piping -
~ Reactor Vessel Downcomer>
.15.
Pressurizer.
16',124.
Steam Generator Downcomer 17, 25 Steam Generator Lower P11num
. 18-20,' 26-28 Secondary, Steam Generator. Tube Region 1
-21, 29 Steam Risers-
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22,-30
. Main S team. Piping 23' Turbine 31-Containment-
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.34 Feedwater Heater
~35,!36 Feedwater Piping Path Number Description
- 1 Core-
-2 Core Bypass
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- 3 Upper Plenum, Reactor Vessel.
'.4, 11 Hot-Leg' Piping
-5,~12-Upper Steam' Generator Shroud
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- 45, 46, 47,'48 Top of Hot Leg " Candy Cane" 6, 7, 13, 14-Primary Heat Transfer Region, S.G.
8, 15 RC Pumps
-9, 16:
Cold Leg Piping 1
. 10~
Downcomer, Reactor Vessel
. ' 17 Pressurizer Surge'Line 18, 19, 26, 27-Steam Generator Downcomer and Plenum 20,' 21,.28, 29
-Secondary Heat Transfer Region, S.G.
-22,_30 Aspirator
.23. Steam Riser, Steam Generator
.24,.32.
Main-Steam Piping-125, 33 Turbine Piping.
34 '
' Steam Crossover.
-36~,
37
.HPI 38,-'39,-43,~44 AN 40, 41:
=Feedwater Piping-142-LPI 49:
Stuck Open Relief Vavle
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. Leak Paths-
-51,752 fem water Pump Paths-53,-54:
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