ML19206A633
| ML19206A633 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/08/1978 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7904200309 | |
| Download: ML19206A633 (12) | |
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REQUEST FOR ADDIEIONAL I N FOR.' TAT IC '
TH9EE MILE ISLMID Distribution:
NRC PDR Local PDR Docket File LNR *4 File R.
S.
Boyd R.
C. DeYoung D.
B. Vassalle F. J. Williams S.
A.
Varga Project Manager p_ sn veo M. Service R. J. Mattson G. Lainas D. Ross Z. Rostoczy-J.
Knight R. Tedesco R. Tedesco B. H. Grier H.
Dentor.
V.
A. Moore R.
H. Vollmer 31.
L.
E ri.s t N.
P.
Conmill N.
"cDonald ELD IE (3)
W.
Haass bec: ACRS (16)
T. Abernathe J.
R.
Buchanan o
1
- F-0 ~37$
fletropolitan EdisGn Comoanj ccs:
George F. Trowot10;3, Esq.
3 Taw, Pittman, Potts & Troweridge 1800 M Street, u. W.
Wash ing ton, D. C.
20036 f ir. I. R. F in t'r oc k Jersey Central Power and Light Campany lladison Avenue at euncn Bowl Road iberistown, New Jersey 07960 Mr. R. Conrad Pennsylvania Electric Ccmpany 1007 3 road Street Johnstowri, Pennsyl/maia 15907 Chauncey R. i:<, 3rd, Esq.
Chairman York Cocaittee for a 3afe Environmant 433 Orlando Drive State College, Pennsylvania 16601 Mr. Richard W. Heuard Project Manager GPU Service Corporation 260 Cherry Hill Road Parsippany, Gew Jersey 07054 Mr. T. Gary aroughton Safety and Licensing : tanager GPU Ser"ica Corporatica 260 Cherry Hill Poad Parsippany, New Jersey 07054 59-035
e""v
- ;c78 Containment Systems Branch
~
Request for Additional Information Three Mile Islano, Unit 2 Docket No. 50-320 1.
The following information regarding the qualificaticn of ecuipment identified in Section S3-42 is requirad.
a.
Provide the specific test report (s) which documents tne qualification test data, testing methods and procecures, and results for each component listed as required for a steam line break inside containment, b.
Describe the cable connection at the comocnent for all com;;cnents u
needed during a MSLS.
Describe how these connections have been qualified for the MSLB environment and identify the applicaole test reports.
c.
Fan cooler motor and centainment purge valve and act. tor qualification data is required if these compcnents are required to operate during a MSL3 accident.
Provice a table er graph of the actual test data which includes temperature, pressure, moisture content, and chemical spray and shcw the duration for which the test parameters were held starting from initial amoient condi tions,
whereavailableprovidecomponentthermoCoufiereadings taken during the qualification testing.
Provide the test report as requested in "a" above.
d.
For motors enclosed in NEMA IV boxes identify the design specifications and clarify whether motors were tested with or without the enclosures.
Provide the t9st report as requested in "a" above.
a3-036
~.
e.
Identify the pressure and.lumidity conditicns of the tests performed for the sele.ted electric po'.. - control.and instrumentation ca:le and terminal connectio-<, r.ceaea ce ng an MSLB accident.
- c
- a :na:
Sectico 3.11.2.1 sb
.s substantially lower environmental qualifi._ tic. cest c,.1ditions than provided in 53-42.
Provide tne test reports for these compcnents as reqJested in "a" abcVe.
f.
Identify the specific transmitters fisted as items f(i) tnru f(v).
Provide the test reports. s requested in item "a" acove.
g.
Clarify that there are no external pressurizer safety relief valve actuation features required during a."SLL which may be subject to the containment environment.
2.
As part of the containment response analysis for a MSL5 inside containment provide the following information.
a.
Provide the results of the single active failure evaluation whicn specifically identifies those containment safety systems and ccmponents relied upon to limit the containment temperature / pressure response to a MSLB accident.
This evaluation should include, but not necessarily be limited to, the loss or availability of offsite power (whichever is worse), diesel ga.arator failure when loss cf offsite power is evaluated, and loss of contc.. ment heat removal systems (either partial or total).
US~027
-3 b.
Justify the assumptions made regarding the time at wnicn active can'ainment heat removal systems become effective.
Include consideration of actuation senscr; and setpoints, activation delay time, and system delay time (i.e., time required to come into operation).
This information should be provided in conjunction to item "a" above.
c.
Jusuiy the selection of the worst case for environmental qualification considering time duration at elevated temperatures as well as the maximum temperature.
In particular provide the results for the spectrum of break sizes analyzed and referred to in Section 158.1.
Provide the pressure, temperature, saturation temperature, and steam generator blewdown duta as a function of time for the worst case analysis for environmental qualification.
3.
The following information is required describing the ccmponent thermal analyses performed as part of the envircnmental qualification.
Eacn component needed during an MSLB should be addressed explicitly.
a.
Provide external and sectional diagrams of each component analyzed showing principle dimensions, materials of construction, and cross sections modeled for analysis.
b.
Provide a detailed description of each thermal model indicating basic assumptions and showing the model mock up witn principle dimensions, materials, and material thermal properties M-038
4 c.
Justify the use of an external convective flow velo. city of 30 ft/sec.
Alternativelv, use tne correlation proviced in the CSS Interim Evaluation Model.
d.
Provide a plot of surface tamperature, heat flux, and heat transfer coefficient for each component thermal analysis for as many points on the comparient as necessary to justify qualification.
e.
Additional information is required to justify the natural convection heat transfer assumption for penetraticn connectors.
t.
(1) Provide an appropriate set of containment layout views which indicates the location of postulated steam line breaks relative to those connectors for which the natural convecticn assumption has been used.
(2) Identify those obstructions which will obviate tne direct flow of steam to the component.
(3) Provide the design specifications (pressure, temperature, external flow, and any others of relative importance) of tha penetration terminal connector boxes.
(4) Provide an appropriate set of views of the boxes to shcw the location, orientation, and principle dimensions of these boxes and the size and location of the steam ingress points relative to the connectors located within.
59 039
9 (5) Provide a more detailed discussion of tne technical basis for the assumptica of natural convection heat transfer only within the boxes.
(6) Identify the specific point on the component which was analyzed and justify that this locatica is the most critical or conservative with regard to potential c'mponent failure.
(7) Provide information sufficient to shcw that the component environmental qualification test resulted in a thermal transient equal to or more severe than that calculated for the thermal analysis at the specific point analyzed.
This should include a description of the test configuration, test data and thermocouple _ locations, anc basis for assessing component surface temperature during the test at the point of analysis.
4.
Provide pressure and temperature qualification profiles which shcw the component peak calculated surface temperature (s) and tne qualification test temperature.
If the component ceak test temperature was held #or a short duration (e.g., less than approximately 10 minutes) or if test conditions were not at the steam saturation temperature provide justificaticn that the qualification temperature has been properly derived (i.e. that the test chamber temperature is the comocnent qualification temperature).
The profiles should be provided for each ccmpenent needed during an MSLB.
Use this information to justify compcnent qualificaticn to the postulated MSL3 accident environment, by 040
CSB Interim Evaluation Modei Environmental Qualification for Main Steam Line Break Insice Containment (Operating License Applicants Only)
Analyses of main steam line break (MSLB) accidents inside PWR cry-type containments have predicted temperature transients which exceed the qualification temperature of scme safety related equipment. As a result there is a concern regarding the capability of tnis equipment to survive such an event to assure safe plant shutdown.
This concern is related to Issue 25 of NUREG-0153 dated September,1975.
The NRC has identified this matter as a Category A Technical Safety Activity and is currently pursuing a program to resolve tnis concern.
t._
In the meantime it is required that you perform an evaluation of tne containment environmental conditions associated with a MSLB accident as well as a LOCA and justify that the essential equipment needec to mitigate these accidents have been adequately qualified.
Since the NRC generic effort on this concern is still in progress, we are providing the analytical assumptions which are acceptable for tne interim period.
These models and assumptions are acceptable for the spectrum of MSLB accidents.
1.
Containment Environmental Response a.
Heat transfer coefficient to heat sinks.
The Uchida heat transfer correlation (data) should be used while in the condensing mode.
A natural convection heat transfer 59-041
_2_
coefficient should be used at all other times.
The application of these correlations should be as follows:
(1) Condensing heat transfer q/A = h (T - I) s w
where q/A = the surface heat flux the Uchida heat transfer coefficient h
=
u the steam saturaticn (dew point) temperature T
=
3 surface temperature of the heat sink T
=
y
.t (2) Convective heat transfer q/A = hc. (T -T) y g
where h convective heat transfer coefficient
=
c T
the bulk vapor temperature.
=
y All other parameters are the same as for tne ccndensing mode.
b.
Heat sink condensate treatment When the containment atmosphere is at or below the saturation temperature, all condensate formed on the heat sinks should be transferred directly to the sump.
When the atmosonere is superheated a maximum of 8% of the condensate may be transferred U9~Od2
s
. to tne vapor region.
The revaporization snculd be calculated as follows:
M = X q / (h -h )
y where M = revaporization rate r
X = revapori:ation fraction (0.05) q
= surface heat transfer rate h = enthalpy of the superheated steam h = enthalphy of the liquid concensate entering u
the sump region (i.e., average entnalpy of :ne heat sink condensate boundary layer) c.
Fieat sin % surface area The surface area of the heat sinks should correspond !" tnat used for the containment design pressure evaluation.
d.
Single active 'ailure evaluation Single active failures should be evaluated for those containment safety systems and components relied upon to limit the containment temperature / pressure response to a MSLB accident.
This evaluation 69~043 should include, but not necessarily be limited to, the loss or availability of offsite power (whichever is worse), diesel generator failure when loss of offsite pcwer is evaluated, and loss of containment heat removal systems (either partial or total).
e.
Containment heat removal system actuation The time determined at which active containment heat removal systems become effective should include consideration of actuation sensors and setpoints, activation delay time, cnd system delay time (i.e., time required to come into operation).
t f.
Identification of most severe environment The worst case for er.vironmental quali ication shculd be selected considering time duration at elevated temperatures as well as the maximum tempe ature.
In particular, :orsider the soectrum of break sizes aralyzed and single failures evaluatec.
2.
Safety Related Component Thermal Analysis Component thermal analyses may be performed to justify environmental qualification test conditions less than those calculated during the containment environmental response calculation.
The thermal analysis should be performed for the potential points of component. failure such as thin cross sections and temperature sensitive parts where thermal stressing, temperature-related degradation, steam or chemical interaction at elevated temperatures, or other thermal effects could 09-044
_5 result in failure of the compartment electrically or nechanically.
The heat transfer rate to components should be calculated as fcilo..s:
a.
Condensing heat transfer rate q/A = h
- (s w}
~
cd where q/A = component surface heat flux n
= condensing heat transfer coefficient cd
= the larger of ax Tagami Correlation or ax Uchida Correlation i
= saturation temperature (dew point) s u
T = component surface temperature g
b.
Convective heat transfer A convective heat transfer coefficient should be used when the condensing heat flux is calculated co be less then the convective heat flux.
During the blowdown period, a forced convection heat transfer correlation should be used.
For example:
NU = C (Re)"
where Nu = Nusselt No.
Re = Reynolds No.
C,n = empirical constants dependent on gecmetry and Reynolds tio.59-045
O.
The velocity used in the evaluation of Reynolds number may be determined as follows:
V = 25 "50 CONT where V
= velocity in ft/se:
= the bicwdown rate in Ibm /hr c
V CONT = containment volume in ft"
/
After the bicwdown has ceased or reduced to a negligibly icw value, a natural convection h::: transfer correlation is t
acceptable.
However, use of a natural convection heat transfer coefficient must be fully justified whenever used.
3.
Evaluation of Environmental Qualificaticn The component peak surface tem:erature(s) (Tcs) should be ccm;uted using items 1 and 2 above.
The component qualification temperature (Tcq) should be determined from the actual environment test conditions.
'n'here components have been " bathed" in a saturated steam or steam / air environment for extended periods (e.g.,10 minutes), the qualification temperature is the test chamber temperature.
For components subjected to test conditions substantially removed from the steam saturation point or for short durations (e.g., less than 10 minutes), the qualification temperature must be justified by experimencal thermoccuple readings on the conponent surface or analyses which minimizes the heat flux to the component.
(3[ ' {ll!(i
)
If the component surface temperature, I s, is less tnan er epual to the temponent qualification temperature, T
, the com;cnent may be considered qualified for an MSL5 envircr. ment during the interi.T period.
If the compcnent surface temperat'are is greater than the qualification temperature, then (a) provide additional justification that tne component can operate in environments ecual to cr greater tnan that which would result in the calculated peak surface temperature, or (b) provide a requalificatien package for the component, or (c) provide appropriate protection to assure that the component will nct experience a surface temperature in excess of the qualification temperature, T,.
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