ML20087N072
| ML20087N072 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/20/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 28053, 80-04-#11, 80-4-#11, MCAR-40, NUDOCS 8404030077 | |
| Download: ML20087N072 (11) | |
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@ Consurners Power James W Cook Vice President - Projects, Engineering and Construction oeneral offices: 1945 West Parnell Road, Jack,un, MI 49201. (517) 788 0453 March 20, 1984 80-04 #11 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 HELBA RESTRAINT DESIGN FILE:
0.4.9.41 SERIAL:
28053
References:
J W Cook letter to J G Keppler, Same
Subject:
(1) Serial 8830, dated September 19, 1980 (2) Serial 10070, dated December 1, 1980 (3) Serial 11525, dated April 3, 1981 (4) Serial 13663, dated September 4, 1981 (5) Serial 14634, dated December 14, 1981 (6) Serial 16147, dated March 31, 1982 (7) Serial 19039, dated September 15, 1982 (8) Serial 20686, dated January 30, 1983 (9) Serial 22184, dated May 6, 1983 (10) Serial 28010, dated February 20, 1984 This letter, as were the referenced letters, is an interim 10CFR50.55(e) report concerning HELBA restraint' design. Attachment 1 provides a status of the actions being taken with regard to this matter. Please note that is a revision to the report attached to our. February 20, 1984 letter. This revision has clarified the Probable Cause portion of the report.
Another report, either interim or final, will be sent on or before September 28, 1984.
8404030077 840320
{DRADOCK 05000329 PDR JWC/AHB/1r : MCAR 40, Interim Report 10, Revision 1, dated 3/16/84 OC0384-0024A-MP01 ggy
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2 Serial 28053 80-04 #11 CC: Document Control Desk, NRC Washington, DC RJCoak, NRC Resident Inspector Midland Nuclear Plant DSHood, NRC Office of NRR Bethesda, MD INPO Records Center l
OC0384-0024A-MP01
3 Serini 28053 80-04 #11 OM/0L SERVICE LIST Mr Frank J Kelley Atomic Safety & Licensing Attorney Ceneral of the Appeal Board State of Michigan U S Nuclear Regulatory Commission Ms Carole Steinberg Washington, DC 20555 Assistant Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Marshall Mr William D Paton, Esq RFD 10 Counsel for the NRC Staff Midland, MI 48640 U S Nucicar Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission East-West Towers, Room E-413 Washington, DC 20555 Bethaada, MD 20014 Ms Barbara Stamaris Dr Frederick P Cowan 5795 North River Road 6152 N Verde Trail Rt 3 Apt B-125 Freeland, MI 48623 Boca Raton, FL 33433 Dr Jerry Harbour Mr Fred C Williams Atomic Safety & Licensing Isham, Lincoln & Beale Board Panel 1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission Washington, DC 20036 East-West Towers, Room E-454 Bethesda, MD 20014 Mr James E Brunner, Esq Consumers Power Company Mr M I Miller, Esq 212 West Michigan Avenue Isham, Lincoln & Beale Jackson, MI 49201 Three First National Plaza 52nd Floor Chicago, IL 60602 0C0384-0024A-MP01
4 1
Serial 28053 80-04 #11 j
Mr D F Judd I
Babcock & Wilcox PO Box 1260 Mr John Demeester, Esq Lynchburg, VA 24505 Dow Chemical Building Michigan Division i-Mr Steve Gadler, Esq Hidland MI 48640 2120 Carter Avenue St Paul, MN 55108 Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street, NW Clark, Klein & Beaumont Washington, DC 20009 1600 First Federal Bldg Woodward Ave 4
Detroit, MI 48226 3/14/84 4
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Attaciment 1 Serial 28053 8
' #2 Bechtel Associates Professional Corporation 145374 I
SUBJECT:
MCAR 40 (issued 8/26/80)
High-Energy Line Break Analysis (NELBA)
Pipe Whip Restraint Designs INTERIM REPORT:
10 Revision 1 DATE:
March 16,1984 PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report provides the current status of MCAR 40 and actions performed since Interin Report 10.
l Description of Deficiency FSAR Subsection 3.6.2.2 states that the analysis of the thrust forces thet result in the event of a pipe rupture is described in BN-TOP-2.
The steady-state thrust forces rather than transient peak thrust forces were l
used in the energy balance techniques for the design of HELBA pipe whip l
restraints. This technique might result in some nonconservative restraint designs.
Susunary of Investination All blowdown thrust force time histories were determined using the computer program PRTHRUST and comparable hand calculations. The restraint designs were evaluated with the PIPERUP computer program as discussed in the Corrective Action section below.
Analysis of Safety Impilcation The safety-related function of a pipe whip restraint is to limit pipe movement following a high-energy line break to prevent unacceptable damage to essential systems or components. Designing the restraint using the steady-state thrust force instead of the higher transient thrust force could compromise this safety function. The size of the restraints may be inadequate for the increased loads, and/or their location may be l
inadequate because a higher thrust force may cause the plastic hinge l
1ength to decrease outside the range of the restraint. This deficiency, had it remained uncorrected, may have adversely affected the safety of I
l operations at the Midland plant if certain types of accidents were to j
occur.
(
0520u l
I4'5374 i
Bechtel Associates Professional Corporation t
I45474 NCAR 40 Interim Report 10 Revision 1 March 20, 1984 Page 2 Probable cause The cause of this discrepancy is that the analysis of postulated instantaneous pipe rupture used a conclusion that steady-state thrust forces were an upper limit; however, this did not in all cases envelope the results that would be obtained by unique thrust force time history analysis.
BN-TOP-2 provides a method of generating steady-state thrust forces accounting for frictional effects, and states that designing to the steady-state force is not always a conservative assumption unless justified, based on a time history analysis. Analysts deduced that the steady-state thrust force bounded any transient loads by performing comparative analyses on a number of sample problems. Several cases were analyaed, and it was concluded (incorrectly) that the restraint design using the steady-state force always enveloped the results of unique l
thrust force time histories.
i subsequent review in 1980 identified several situations for which this conclusion was not valid.
Corrective Action The status of corrective action is as follows.
1 Initially, 325 restraints were considered to be associated with the NCAR 40 concern. The number of potentially affected restraints was reduced to 116 by deletions due to pipe rerouting, shifts in break locations, and changes in analysis assumptions.
The attached table shows the status of the remaining 116 restraints, many of which are being modified for reasons other than the subject problem.
Nowever, a detailed evaluation of each restraint is not being made to determine if the redesign is necessary for NCAR 40 concerns or for other reasons.
Since the last interim report, Consumers Power Company has indefinitely deferred design and construction of Unit 1 and the evaporator steam supply steam. Pipe whip restraints in the attached table that are affected by this deferral are indicated by Footnote 4 in the Construction Hold column.
In addition, Consumers Power company has directed that pipe whip restraints designed to mitigate arbitrary intermediate location pipe breaks be placed on hold. The pipe whip restraints in the attached table affected by this hold are indicated by Footnote 3 in the Construction i
Hold column. This hold has been placed in anticipation that the requirement to postulate arbitrary intermediate breaks (and to design sitigative devices for these breaks) will ba removed.
0520u
I45374 Bechtel Associates Professional Corporation NCAR 40 Interin Report 10. Revision 1 March 20, 1984 Page 3 All MCAR 40 concerns, including plastic hinge lengths, have already been incorporated into the design process. The peak pressure blowdown forces have been calculated and provided as input.for the design of pipe whip restraints. The whip restraints have been designed or are being designed to appropriate criteria, which include peak pressure blowdown forces.
Assumptions and work processes used by the HELBA group were reviewed by the Bechtel chief nuclear engineer for problems similar to the NCAR 40 No other areas were identified as having similar potential concern.
problems. Part of the corrective action has included training sessions for the nuclear HELBA group to preclude recurrence of problems siellar to MCAR 40.
Final design drawings will be issued as required when the final decision is made regarding the requirement to postulate arbitrary intermediate breaks.
Rooortability This condition was reported by Consumers Power Company to the NRC as a potential 10 CFR 50.55(e) reportable condition on August 21, 1980.
Submitted by: D iG E.B. Poser Project Engineering Manager
\\
b Approved by:
E.it. Hu'ghe's Nuclear Chief gineer Approved by:
E.H. Smith Engineering Manager Concurrence by:
f r M.A. Dietric[
Project Quality Assurance Engineer j
RJB/JEG/dao*(N)
Attachment:
Status of Pipe Whip Restraints Potentially Affected by MCAR 40, January 31, 1984 0520u
CIDLAND UNIYS 1 AND 2 STATUS OF PIPE NHIP RESTRAINTS POTENTIALLY AFFECTED BY MCAR 40(1)
Reste Mod.
Mod.
-8P SysLtem Pipe (2)
Install Conste Size OK Loc OK Site OK Loc OK Needed Needed.
(f3 ID Restraint Bldo
(%)
Hold Phase I Phase I Phase II Phase II Site Loc w
N Inside Containment DH return line PR-610-2-6 Reactor 50 Yes(4) No No No No Yes Yes DH return line PR-610-2-0 Reactor 50 Yes(4) No No Yes Yes No No DH return line PR-610-2-10 Reactor 50 Yes(4) No No No No Yes Yes DH return line PR-610-2-12 Reactor 50 Yes(4) No No No No Yes Yes DH return line PR-611-2-3 Reactor 100 No No No No No Yes Yes DH return line PR-611-2-5 Reactor 100 Yes(3) No No No No Yes Yes C.r1 DH return line PR-611-2-9 Reactor 100 No No No Yes Yes No No
.a:-
DH return line PR-611-2-12 Reactor 0
No No No No No Yes Yes y
DH return line PR-611-2-13 Reactor 0
No No No No No Yes Yas DH return line PR-611-2-21 Reactor 100 No No No No Yes Yes No MFW PR-638-13-5 Reactor O
Yes(4) No No Yes Yes No No MFW PR-638-13-6 Reactor O
Yes(4) No Yes No Yes No MFN PR-638-13-7 Reactor 0
Yes(4) No Yes No Yes No MFW PR-633-13-8 Reactor 0
Yes(4) No No No Yes Yes No MFW PR-638-13-9 Reactor 0
Yes(4) No Yes No Yes No MFW PR-638-13-14 Reactor 0
Yes(4) No Yes No Yes No MFW PR-638-13-15 Reactor 0
Yes(4) No Yes No Yes No MFW PR-638-13-16 Reactor 0
Yes(4) No Yes No Yes
'No MFW PR-638-13-17 Reactor O
Yes(4) No Yes No Yes No MP PR-638-13-18 Reactor 0
Yes(4) No No No Yes Yes No NFs PR-638-13-19 Reactor 0
Yes(4) No Yes No Yes No Wrw PR-638-13-20 Reactor 0
Yes(4) No Yes No Yes No MFW PR-638-13-21 Reactor 0
Yes(4) No No No No Yes Yes MFW PR-639-13-2 Reactor 100 No No No No Yes Yes No MFW PR-639-13-16 Reactor 50 No No Yes No Yes No MFW PR-639-13-17 Reactor 50 No No No No Yes Yes No MFW PR-639-13-18 Reactor 30 No No No No Yes Yes No a
MFW PR-639-13-29 Reactor 50 No No Yes No Yes No MFW PR-639-13-35 Reactor 100(5)
No Yes Yes No No HPI. Normal MU PR-604-1-15 Reactor 0
Yes(4) Yes No No No Yes HPI. Normal MU P2-604-2-41 Reactor 0
Yes(4) Yes No No No Yes Letdown PR-603-3-2 Reactor 0
Yes(4) No No No No Yes Yes Lotdown PR-603-3-4 Reactor 0
Yes(4) No No No Yes Yes No Letdown PR-603-3-6 Reactor 130 Yes(4) No No No Yes Yes No Letdown PR-603-3-8 Reactor 100 Yes(4) -
No No Yes Yes No 4
Page 1 01/31/84 0032u
l Pine Whio Restraints Potentially Affected by MCAR 40 (continued)
Restr Mod.
Mod.
System Pipe (2)
Install Conste Size OK Loc OK Site OK Loc OK Needed Needed ID Restraint Blda (4)
Hold Phase I thase*I Phase II Ehast_LL size 1.oc Letdown PR-603-3-9 Reactor i100 Yes(4) -
No No Yes Yes No Letdown PR-603-3-10 Reactor 0
Yes(4) -
No No Yes Yes No I
Letdown PR-604-3-7 Peactor 0
No No No No No Yes Yes Letdown PR-604-3-9 Reactor 100 No No No No No Yes Yes i
Letdown PR-604-3-10 Reactor O
No No No No Yes Yes l
Letdown PR-604-3-48 Reactor 0
Yes(3) No No No No Yes Yes
.O Outside m
Containment APW PR-633-4-4 Aux 0
Yes(4) No No No Yes Yes No N '
.c-AFW PR-633-5-1 Aux 0
Yes(4) No No No Yes Yes No C.r3 t
AFW PR-633-5-2A Aux 0
Yes(4) No No No No Yes Yes
,g.
APW PR-633-5-3 Aux 0
Yes(4) No No Yes Yes No No AFW PR-633-5-5 Aux 0
Yes(4) No No No Yes Yes No i
AFW PR-633-5-6A Aux 100 Yes(4) No No No No Yes Yes AFW PR-633-5-6B Aux 100 Yes(4) No No No No Yes Yes AFW PR-633-5-7 Aux 0
Yes(4) No No No No Yes Yes AFW PR-633-5-9 Aux 0
Yes(4) No No No No Yes Yes APW PR-633-5-12 Aux 0
Yes(4) No No No No Yes Yes AFW PR-633-5-18 Aux 0
Yes(4) No No No No Yes Yes t
AFW PR-634-5-1 Aux 0
No No No No No Yes Yes 4
AFW PR-634-5-2 Aux 0
No No No No No Yes Yes I
AFW PR-634-5-3 Aux 0
No No No No Yes Yes No AFN PR-634-5-4B Aux 0
No No No No Yes Yes No i
AFW PR-634-5-10 Aux 100 No No No No No Yes Yes l
AFW PR-634-6-2A Aux 100 Yes(3) No No No No Yes Yes i
APW PR-634-6-3 Aux 0
Yes(3) No No Yes Yes No No AFW Pk-634-6-4 Aux 100 Yes(3) No No No No Yes Yes AFW PR-634-6-7 Aux 100 No No No No No Yes Yes AFW PR-634-6-8 Aux 100 No No No No No Yes Yes i
Matt steam PR-631-2-1 Aux 100 Yes(4)
?
Main steam PR-631-2-2 Aux 100 Yes(4) -
Yes Yes No No t
Yes Yes No No f
Main steam PR-631-2-3 Aux 100 Yes(4) -
Yes Yes No No y
l Main steam PR-631-2-4 Turbine 40 Yes(4) -
No Yes Yes No I
Main steam PR-631-2-5 Turbine 40 Yes(4) -
No Yes Yes No L
q Main steam PR-631-2-6 Turbine 40 Yes(4) -
No Yes Yes No Main steam PR-631-3-1 Aux 95 Yes(4) -
Yes Yes Ko No 1
Main steam PR-631-3-2 Aux 95 Yes(4) -
Yes Yes No No j
.PR-631-3-3 Aux 95 Yes(4) -
Yes Yes No No j
Main steam PR-631-3-4 Turbine 0
Yes(4) -
No Yes Yes No 1
Page 2 0032u 01/31/84 4
Pipe Whip Restraints Potential 1Y Affected by MCAR 40 (continued)
Restr Mod.
Mod.
System Pipe (2)
Install Constr Size OK Loc OK Size OK Loc OK Needtd Needed ID Restraint Blda (M
Hold Phase I Phase I Phase II Phase II 5%:e Loc Main steam PR-631-3-5 Turbine 0
Yes(4) -
No Yes Yes No Main steam PR-631-3-6 Turbine O
Yes(4) -
No Yes Yes No C/1 C.o Main steam PR-632-2-1 Aux 95 No Yes Yes No No y
Main steat PR-632-2-2 Aux 95 No Yes Yes No No Main steam PR-632-2-3 Aux 95 No Yes Yes No No Main steam PR-632-2-4 Turbine 40 No Yes Yes No No Main steam PR-632-2-5 Turbine 40 No Yes Yes No No Main steam PR-632-2-6 Turbine 40 No Yes Yes No No Main steam PR-632-2-7 Turbine 40 No Yes Yes No No Main steam PR-632-2-8 Turbine O
No Yes Yes No No Main steam PR-632-2-9 Turbine O
No Yes Yes No No C/1 4:=
Main steam PR-632-3-1 Aux 95 No Yes Yes No No y
Main steam PR-632-3-2 Aux 95 No Yes Yes No No Main steam PR-632-3-3 Aux 95 No Yes Yes No No Main steam PR-632-3-4 Turbine O
No Yes Yes No No Main steam PR-632-3-5 Turbine O
No Yes Yes No No Main steam PR-632-3-6 Turbine O
No Yes Yes No No Yes Yes No No Main steam PR-632-3-7 Turbine O
No Main steam PR-632-3-8 Turbine O
No Yes Yes No No Main steam PR-632-3-9 Turbine O
Mo Yes Yes No No Main steam PR-632-3-10 Aux 90 No Yes Yes No No Main steam PR-660-1-1 Aux 90 Yes(4) No Yes No Yes No Main steam PR-660-1-2 Aux 90 Yes(4) No Yes No Yes No Main steam PR-660-1-3 Aux 90 Yes(4) -
Yes Yes No No Main steam PR-660-1-4 Aux 90 Yes(4) -
Yes Yes No No Main steam PR-660-1-5 Tunnels O(5)
No No No No No Yes Yes i
Main s' team PR-660-1-6 Tunnels 0
Yes(4) No Yes No Yes No Main steam PR-660-1-7 Tunnels 0
Yes(4) No Yes No Yes No Main steam PR-660-1-8 Tunnels O(5)
No No No No No Yes Yes Main steam PR-660-1-9 Tunnels O
Yes(4) No Yes No Yes No Main steam PR-660-1-10 Tunnels 0
YesI4) No No No No Yes Yes Main steam PR-660-1-11 Tunnels 0
Yes(4) No No No No Yes Yes Main steam PR-660-1-12 Tunnels 0
Yes(4) No Yes No Yes No Main steam PR-660-1-13 Aux 95 Yes(4) No Yes No Yes No Main steam PR-660-1-14 Tunnels 0
Yes(4) No No No No Yes Yes Main steam PR-660-1-15 Tunnels O(5)
No No No No No Yes Yes Letdown PR-603-15-1 Aux O(5)
No No No Yes Yac Letdown PR-603-15-4 Aux 0
Yes(4) No No Yes Yes Letdown PR-603-15-5 Aux O(5)
No No No Yes Yes Letdown PR-604-15-1 Aux O(5)
No No No Yes Yes Letdown PR-604-15-2 Aux O(5)
No No No Yes Yes Page 3 01/31/84 0032u
Pine Whio Restraints Potentially Affected by MCAR 43 (continued)
Restr Mod.
Mod.
System Pipe (2)
Install Constr Site OK Loc OK Site OK Lcc OK Needed Needed,
ID Restraint Blda (t)
Hold Phase I Phase I Phase II Phase II S%te Loc L11 Letdown PR-604-15-3 Aux O(5)
No No No Yes Yes f.0 Letdown" PR-604-15-5 Aux O(5)
No No No Yes Yes N
Letdown PR-604-15-7 Aux O(5)
No No No Yes Yes p
Footnotes (1) Phase I is an energy balance analysis: Phase II is a time-history (dynamic) analysis (2) Total potentially affected pipe whip restraints = 116 (3)This pipe whip restraint is designed to mitigate a postulated arbitrary-location intermediate break and has been placed on hold in accordance with Consumers Power company direction via letter te Bechtel dated November 18 1983 (Com 135279).
(4)This pipe whip restraint is associated with Unit 1 or the evaporator steam supply system. Those systems 4
have been indefinitely deferred by Consumers Power Company.
(5)This pipe whip restraint is being deleted.
C#1
.e-LEGEND:
y i
DH: Decay heat MFN: Main feedwater AFW: Auxiliary feedwater
]
HPI: High-pressure injection MU: Makeup AUK: Auxiliary NA: Not available Loc: Location Mod: Modification 1
l i
i Page 4 41/31/84 0032u
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