ML20207C829
| ML20207C829 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/23/1986 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8612300252 | |
| Download: ML20207C829 (48) | |
Text
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.8 TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 SN 157B Lookout Place DEC 23 E86 Director of Nuclear Reactor Regulation Attention:
Mr. B. Youngblood, Project Director PWR Project Directorate No. 4 Division of Pressurized Water Reactors (PWR)
Licensing A U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Dear Mr. Youngblood:
In the Matter of
)
Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT - ADDITIONAL INFORMATION ON SEQUOYAH'S EQUIPMENT QUALIFICATION UNDER SUPERHEAT CONDITIONS TVA received NRC's draft copy of their evaluation on equipment qualification (EQ) under superheat conditions dated November 25, 1986, and concurs with the staff's acceptance of TVA's calculated component surface temperature profiles. The draft stated that NRC was still evaluating TVA's approach to calculating internal temperatures of various components.
To support their evaluation, NRC requested additional information in a letter dated November 19, 1986.
In response to NRC's request for additional information, TVA is submitting the enclosed response entitled " Electrical Equipment Qualification for a Main Steam Line Break in the Main Steam Valve Vaults."
TVA's approach to the EQ problem continues to focus on the internal temperatures of the critical components for establishing qualification. TVA also chose to evaluate the thermal response of each critical component in lieu of selecting the most limiting devices (i.e., ASCO solenoid valve and piece of cable). This method is more direct and should simplify the basis for TVA's selection of critical components.
This submittal responds to all NRC's questions and concludes by thermal analysis (critical components) and by test (cable) that electrical equipment within Sequoyah's valve vaults are qualified and would perform their safety related function in the event of a main steam line break. This submittal should also enable NRC preparation of a Safety Evaluation Report (SER) on Volume 2 of Sequoyah's Nuclear Performance Plan.
If you have any questions concerning this issue, please call Don Coodin of Sequoyah Site Licensing Staff at (615) 870-7462.
Very truly yours, TENNESSEE VALLEY AUTHORITY 8612300252 Eh61223 PDR ADOCK 05000327 P
PDR.
.rR. Crldley, Director Nuclear Safety and Licensing Enclosure cc: See Page 2 0
B e Equal Opportumty Employer
e Director of Nuclear Reactor Regulation g(( 2 3 ))]$
cc (Enclosure):
U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Carl Stahle, Sequoyah Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Mr. G. G. Zech, Director TVA Projects U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
s.
RESPONSE TO NRC QUESTIONS ON ELECTRICAL EQUIPMENT QUALIFICATION FOR A MAIN STEAM LINE BREAK IN THE MAIN STEAM VALVE VAULTS NRC requested additional information from TVA on the effects of temperature on electrical equipment located in the Sequoyah Nuclear Plant's main steam valve vaults during a main steam line break (NSLB). The request was made by letter from B. J. Youngblood to S. A. White dated November 19, 1986. TVA used
-temperatures of critical components inside pieces of equipment to establish qualification.
NRC, in general, has only considered outside surface temperatures in establishing qualification. This response will provide:
A.
A brief background; B.
The reasons TVA found it necessary to to use internal temperatures instead of surface temperature; C.
A discussion of the electrical equipment located in the valve vaults; D.
A discussion of the critical internal components; E.
A discussion on cables located in the valve vault, and; F.
Analyses supporting the conclusions.
A.
BACKGROUND TVA previously evaluated electrical equipment located in the valve vaults assinst a temperature profile with a peak temperature of approximately 300 degrees F.
Westinghouse subsequently informed TVA that certain energy additions to the steam had not been accounted for appropriately.
New mass and energy release data and valve vault temperature profiles were provided by Westinghouse considering the additional energy. The new temperature proflies were substantially higher than the TVA' design value. This information was provided in our August 13, 1986 submittal on this issue.
B.
USE OF INTERNAL TEMPERATURES
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i The electrical equipment located in the valve vaults was qualified using generic vendor qualification test data. These tests were generally more j
severe than the original design values for the valve vaults, particularly the duration at elevated temperatures. However, the new MSLB valve vault peak atmospheric temperature and the resulting surface temperatures calculated for the electrical equipment exceeded the qualification peak test chamber temperatures in many instances. Comparing the new MSLB profile to the qualification test profiles showed there were a number of 1
l compensating effects. Most importantly, the duration of the MSLB event i.
is very short (approximately 10 minutes). Most of the qualification testing was done at temperatures in excess of 300 degrees F for several
i hours. The long qualification test durations would heat up the entire piece of equipment to temperatures approximately equaling those of t he test chamber atmosphere. In addition, many of the tests were done using saturated steam and a saturated test chamber. This resulted in high condensation heat transfer coef ficients being present for long durations.
In the valve vault, the saturation temperature would be approximately 212 degrees F.
Thus, lower natural or forced convection heat transfer coefficients would be present for most of the transient.
principally due to the short duration of the event, TVA believed that while high surface temperatures were possible, it was considered unlikely that the internal components of equipment would rise above the temperatures they experienced during qualification testing. The equipment that would heat up most during the steam line break were the ones with the least thermal inertia. The valve vault equipment lists were reviewed and components with low mass and thin housing were selected for analysis. TVA believed that the thermal response of these components would bound the response of all other larger and heavier components.
Analysis showed that the surface temperature of the housing of the chosen components did exceed the temperature of the test profile during the MSLB.
However, the temperature of internal components was lower than that which the components experiencel during the testing. The difference was often very substantial. Because of this, the use of the internal temperatures was justified. Using surface temperatures would require the retesting of virtually all components in the valve vault without any gain in component reliability or any improvement in plant safety. Analyses are provided in this submittal for electrical equipment that has not been qualified to the new MSLB profile by test.
The only exception is where a single analysis can be used for very similar models of equipment from the same manufacturor. This was done instead of justifying that the ASCO solenoid valve and the cable bound the thermal responso of all other components. Ilowever, the results support the conclusions drawn in the August 13, 1986 report. (This responds to question 1.c.)
C.
ELECTRICAL EQUIpMdNT LOCATED IN Tile VALVE VAULTS 10 CFR 50.49 electrical equipment is categorized as A, B, or C depending on its function during various plant accidents or transients. A category A device is one required to operato to mitigato an event.
A category B device is not needed to mitigato the event, but it must not fall in a manner detrimental to plant safety. A category C device is not needed nor would its failure affect a category A or B devico. The categorization of devices is done as a front-end input to the 10 CFR 50.49 equipment qualification (EQ) program.
The EQ program takes the list of category A and B devices and establishes their qualification to the environmental conditions present in the area where the equipment is located. Categorizations are established on the basis of required functions for a given event.
No equipment is removed from consideration based upon any factor other than function.
(This addresses question 1.d.)
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' f Table 1 provides the current list of category A or B devices (excluding cable) expected to be in the valve vaults at the time of restart of Sequoyah unit 2.
Table 3 provides a list of the cable types located in i
the valve vaults. These lists are not identical to the lists in Appendices A and B of our August 13, 1986 report. The lists provided in the August report included category C components in addition to A and B i
components. Also, some devices have been reclassified from C to B and some category A or B devices are being removed from the valve vaults.
Table 1 also provides the device number, manufacturer, model number, and r
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a description of the function of the component.
(This addresses l
questions 1.a. 1.b, and 2).
Equipment listed in the tables are valves, valve limit switches, valve positioners, terminal blocks, and splices.
D.
CRITICAL INTgRNAL COMPONgNTS f
All of the category A and B electrical equipment-in the valve vaults was examined to determine which of the internal components were the most j
heat sensitive and where they were located in the equipment. The l
critical components were cable insulation, other elastomers, and solenoid coils. Table 2 lists the critical component (s) for each piece of equipment and why we concluded that these components would not fail.
To summarize the findings:
- 1. Cable inside conduit was determined to be qualified by test.
- 2. The other elastomers used in components located in the valve vaults have continuous service temperatures that are'much higher than the peak atmospheric temperature during a MSLB.
(This combined with j
table 2 responds to question 4.)
- 3. Solenoid coil temperatures due to the MSLB, considering both peak and duration, were shown by analysis to be less than the temperature l
calculated to be experienced during the qualification tests. This was true for both energized and nonenergized coils.
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It should be noted that in the main steam valve vaults are classified j
as a low radiation zone (i.e., 1.8 x 103 total 40 yr. integrated i
dose).
This low integrated dose level produces no significant changes in the mechanical or electrical properties in organic j.
materials used in electrical equipment (reference SQN EQ Binder j
SQWEQ-CEN-001).
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E.
CABLES LOCATED IN THE VALVE VAULT All cables and splices in the valves vaults classified as category A or i
B are qualified based in part upon a TVA type test.
This test showed j.
that the temperature inside conduits for the brief duration of the MsLB 4
would not exceed the qualification profiles of the cables. This is documented in each of the appropriate Sequoyah Cable EQ Blnders.
l Analyses of junction boxco showed the maximum box inside surface l
temperature was less than the qualification temperature of any cable, i
L
i 4
In determining which cable to evaluate, several factors were considered.
All of the cables located in the valve vault are routed through conduits and are terminated in junction boxes. The cables and splices are insulated with either thermoset or thermoplastic materials. Thermoset materials, such as crosslinked polyethylene, have greater heat stability than thermoplastics. On this basis, a cable with thermoplastic insulation was chosen.
The cable sizes were also reviewed and one with small conductors was selected to minimize the thermal inertia of the cable and thus provide for a rapid heatup.
TVA cable type PJJ was determined to be the cable type used in the valve vault that was most likely to fail.
PJJ cable is a small multiconductor cable. The individual conductors are insulated with polyethylene and jacketed with polyvinyl chloride. The outer jacket is polyvinyl chloride. Both of these materials are thermoplastic materials. A four conductor cable and a single conductor out of the four conductor cable were tested. The cable was energized during the test. It was on this basis that TVA concluded that the appropriate cable had been evaluated and that since this cable was
. qualified all other cable located in the valve vaults would be qualified for the new MSLB. Table 3 provides a list of the cable types located in the valve vaults.
(This responds to Question 3.)
F.
Analyses of Electrical Eeulement Analyses to evaluate the thermal response of the main steam isolation valve (MSIV) solenoid valves, ASCO solenoid valves, Limitorque valve operators, junction boxes, terminal connectors, and Namco limit switches have been performed. For critical components in each of those devices, the thermal response to the worst-case MSLB and to the appropriate environmental qualification test was calculated.
Analytical Models computer models to be used to determine the thermal response of the all components discussed above were developed for the heat transfer code, HEATING 5.
The nodalization utilized in these models corresponds to the physical parameters of the component being modeled.
Some components modeled in one dimension in the August 13, 1986 submittal have now been modeled in two dimensions (i.e., ASCO solenoid) in much greater detail.
Models of additions 1 components included for the first time in this submittal are all two dimensional with the exception of the qualification analysis of a single conductor cable. A one-dimensional model is appropriate for this cable since it is symmetric in both the azimuthal and axial directions.
Material properties used in these analyses are basically the same as reported in the August 13, 1986 submittal. The exception to this is the use of more detailed data on the density and conductivity of air and the conductivities of carbon and stainless stool as functions of temperaturo.
The additional data for air and carbon steel was obtained from Table A-1 of Heat and Mass Transfer by E. R. C. Eckert and Robert Drake and is given in Table 4.
The properties for stainless steel were obtained from Table A-1 of Principles of Heat Transfer by Frank Kreith.
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Hast transfer coefficituts for condensation, convection (forced and natural), and radiation irere determined from applicable correlations and
'NRC requirements. :Condensatioa heat transfer was assumed when the following two conditions bero satisfied:
1.
The temperature of tha valve vault or test chamber was equal to or exceeded the. saturation temperature.
'2 The suc' ace temperature of the device being modeled was below the saturation temperature.
Switchover to conynetive heat transfer was assumed to occur when the calculated heat flux using the applicable convective heat transfer correlation exeseded the heat flux due to condensation. Radiation heat transfer to the surface of the device from the surrounding atmosphere during both the qualification and MSLB analyses utilized the beam length method described in principles of Heat Transfer by Frank Kreith to obtain proper emissivitits.
Radiation heat transfer from the device casing to the critical internal components was modeled as heat transfer between parallel plates. Radiation heat transfer was assumed to occur at all times.
For the MSLB analysis, condensation heat transfer coefficients were derived from the Uchida correlation. As required by Appendix B of NUREC-588, a condensing heat transfer coefficient of four times Uchida was used.
Forced convective heat transfer coefficients were obtained from the Hilpert correlation or from flow over a flat plate. Tho forced convoetive heat transfer coefficients were derived using data from the COMPACT analysis. Free convective heat transfer coefficients were derived from appropriate correlations for laminar or turbulent flow.
For the heat transfer analyson of the devices during qualification testing, condensation host transfer coefficients were derived using the same methodology as in the MSLB analysis. Condensation heat transfer coefficients were taken at four timos Uchida. Convective heat transfer during the qualification tests was conservatively modeled as laminar-free convection for transient periods after switchover from condensation. The free convective heat transfer coefficients were obtained using the same methodology as the MSLB analysis. This assumption conservatively neglects any offects of forced convection resulting from velocities induced by steam addition to maintain the test chambor conditions. Heat transfor coefficients during spray periods used appropriate correlations for laminar film flow.
The atmospheric profilo corresponding to the worst-case break (i.e.,
0.9FT2 MSLB at 102-percent power downstream of the main steam lino check valvo as dotermined in the August 13, 1986 submittal) was used to calculate the ecmponents thermal responso to the MSLB.
The qualification test atraosphoric profile contained in the appropriate Sequoyah EQ bindor was used to determino the thermal response of components during qualification.
e MSIV Solenoid Valve Model The MSIV solenoid valve is composed of a copper coil located inside a one-eighth-inch steel sheet metal housing. There is a one-inch air gap between the box and the coil assembly. The 11-watt power rating of the MSIV solenoid coil was modeled as a heat generation function over the entire coil region. A cteady-state solution was performed and the heat generation rate adjusted until the calculated coil temperature matched the coil operating temperature of 271 degrees F before any transient was modeled (reference SQN EQ binder SQNEQ-SOL-004).
All material layers were considered to lay tightly against each other to promote the heat transfer.
In addition to conductive heat transfer, radiative heat transfer across internal air gaps was modeled. The MSIV was assumed to remain energized for 10 minutes before being tripped by operator action.
During qualification testing, the MSIV solenoid coil assembly was exposed directly to the environment without the protective housing.
The temperature profile uced to determine the EQ test response is given in section D of the EQ binder referenced above.
ASCO Solenoid Valve The ASCO solenoid valve consists of a cylindrical carbon steel core encased within a sleeve surrounded by a copper coil. This assembly is partially surrounded by a steel yoke which is open on one side. The entire solenoid mechanism is contained inside a carbon steel housing cover with varying air gap thicknesses between the cover and the yoke.
A two dimensional model combining the horizontal and vertical cuts given in the August 13, 1986 submittal was constructed for analysis. The side of the solenoid with the opening in the steel yoke was modeled to conservatively maximize the heat transfer to the coil and reduce thermal inertia.
All material layers were considered to lay tightly against each other to promote the heat transfer.
In addition to conductive heat transfer, radiative heat transfer across internal air gaps was modeled.
Analyses to model both energized and unenergized solenoids during the MSLB were performed. The analysis of the unenergized ASCO assumed an initial temperature of 140 degrees F.
This is the maximum temperature of the valve vault before a break. The energized ASCO was assumed to have a constant heat generation rate for the entire coil region to model the coil power. A steady state solution was performed and the heat generation rate adjusted to match the coil operating temperature of 361 degrees F (reference SQN EQ binder SQNEQ-SOL-004) before the MSLB transient was modeled. This analysis assumed that the solenoid remained energized for five minutes after the break before being tripped.
This is the maximum required operating time after a MSLB and was taken from a TVA generated category and operating times document. All safety functions associated with the energized ASCOs are to be completed within five minutes after the becak occurs. The energized ASCO model was used to determine the ASCOs thermal response to the environmental i
e
, qualification profile'given in section D of the SQN EQ Binder SQNEQ-SOL-004. The heat transfer coefficients, the temperature forcing function,-and the time of solenoid deenergization to be used in this analysis were determined from the test parameters.
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ASCO solenoid valve model Nos. 206-381-2RVU and 206-381-3RVF are used in the valve vaults (one ASCO model number 206-381-3RF is located in unit 1, but will be converted to 206-381-3RVF before restart of unit 1).
Both models are constructed of the same materials with identical external dimensions. The difference in the model designations is due to
. the size of the internal orifice. The two-dimensional model used in the analyses is not impacted by this difference and is therefore applicable to all ASCOs in the valve vaults.
The ASCO solenoid valve body was not modeled. The only heat-sensitive component in the body was Viton seat material.
This material, as discussed in Table 2, will not be degraded by the temperatures present in the valve vault as a result of a MSLB.
Limitorque Valve Operators 1
The Limitorque valve operators are large electrical devices with large thermal inertias. All of the critical heat sensitive components with the exception of the motor windings are housed in a thick protective box i
on the side of the component.
The motor windings are enclosed in a separate housing. A two-dimensional HEATING 5 model of the protective box and its internal components (i.e., limit switch, torque switch, terminal connector, and jumper cables) was constructed.
The initial temperature of the Limitorque valve operator was assumed to be 140 degrees F.
The housing cover was the only surface directly subjected to the environmental conditions modeled in both the worst-case MSLB and the environmental qualification analysis.
Heat transfer to the critical components occurs as a result of conduction and radiative heat l
transfer across the air gap that lays between the critical components and the housing cover.
j The Limitorque model uvid in the EQ and the worst-case MSLB analysis l
were identical, except for changes in the heat transfer coefficients and the temperature forcing function. The Limitorque modeled in the analyses was model SMB-00.
As stated in the SQN motor-operated valve EQ binder SQNEQ-MOV-02, a qualification program was conducted by the Limitorque Corporation to demonstrate that Limitorque motor-operated valve actuators are capable of performing design basis functions under I
postulated accident conditions in a nuclear plant. The Limitorque qualification program was conducted to encompass the entire family of actuators, i.e., SMB, SB, SBD, and AMB/HBC in all available unit sizes (SMB-000 to SMB-5).
All sizes of actuators are constructed of the same materials with components designed to equivalent stress levels, clearances, and tolerances with the only differences being in the physical size which varies with unit rating. The Limitorque model numbers used in the valve vaults are SMB-00 and SB-4.
The only difference between the two models as indicated above is the unit size, with model SB-4 being considerably larger than the SMB-00.
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, The larger mass of the SB-4 (approximately 2,500 pounds) provides increased thermal inertia. The increased thermal inertia and the material and construction similarities permits the results of two-dimensional SMB-00 model to be conservatively applied to the Limitorque model SB-4.
Namco Limit Switches The Namco limit switches are small mechanical / electrical devices used for interlocks of control circuits and to indicate the position of valves.
When the August 13, 1986 submittal on this issue was made, the limit switches had been determined to be category C devices. Since our submittal, additional studies of category A to C interactions have been completed and the categorization of some of these switches in the valve vaults has been raised to category B.
The critical heat sensitive components in the Namco limit switches are the contact carrier and carrier block. These are constructed of mineral filled phenolic. The critical components are separated from the outside housing by a small air gap.
These switches are physically smaller than the ASCO solenoid valves, but do not generate any internal heat nor are the internal components of the Namco as thermally sensitive as the ASCO coils.
The Namco limit switch model numbers used in the valve vaults are EA-740 and EA-180.
Similar materials are used in the construction of the housing and internal components in both models.
However, differences exist in the design of the internal switching mechanism.
An examination of the paths of thermal resistance determined that model EA-740 had the path of least resistance from the surface to the critical components even though it is physically slightly larger than the EA-180.
The qualification profile used for testing is virtually identical for both Namco models, except for duration at peak temperature (the shorter duration at peak temperature was conservatively used in the qualification analysis). Thus, it was concluded that the results of an analysis of the model EA-740 is applicable to both models.
A two-dimensional HEATING 5 model of the protective housing and the internal components was constructed for the model EA-740 and analyzed to both the MSLB and qualification tests.
Junction Boxes and Associated Equipment Junction boxes are sheet steel enclosures which contain cables, splices, and terminal blocks. A two-dimensional HEATING 5 model of the junction box used in the qualification testing of the terminal blocks was constructed. Analyses were performed to evaluate the response of both the junction box and terminal blocks to the MSLB and qualification tests.
For the MSLB analyses, two models of the junction box were constructed and analyzed; (1) a junction box containing only air, and (2) a junction box containing the snallest terminal block used in the valve vault. The empty junction box model and the choice of the smallest terminal block assembly conservatively lowers the thermal inertia and maximized the response of both components to the environment. The qualification tes
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The results of the analysis of the empty junction box demonstrated that the temperature of any cable or splices located in a junction box would not exceed the qualification temperature for those components. The temperature of the air and the inside surface of the box never exceeded the environmental qualification temperature, in either magnitude or duration, of the splices or the worst cable (see Tables 2 and 3).
Therefore, it is concluded that the analysis of the empty junction box represents a bounding analyses for all cable splices located in junction boxes in the valve vaults.
Results The results of the analyses performed are provided in Figures 1 through 16.
The results, as they apply to particular internal components, are discussed in Table 2.
Included in the figures are plots of qualification test profiles and Table 3 provides the qualification temperature of the PJJ cable.
(This responds to question le.)
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., RESPONSE TO QUESTION 5 This response to Question 5 was provided by Westinghouse.
The equipment model in the COMPACT code is essentially a slab model, which models equipment as multilayer slab type heat sinks subjected to the temperature transients resulting from main steamline breaks. The slab model is a one-dimensional model, which assumes heat transfer in only one direction within equipment. The one-dimensional model, in conjunction with proper selection of heat transfer paths from the equipment's external to internal surfaces, can be used to maximize the equipment's external and internal surface temperatures. This ensures that the equipment's external and internal surface temperatures are calculated conservatively.
For example, the ASCO solencid valve model used the horizontal section, which has the largest air gap, to maximize the external housing temperature, and the vertical section, which has the least thermal resistance, to maximize the internal surface temperatures of the valve. Modeling of the horizontal section assumes heat transfer in only one direction (horizontal direction) and neglects the vertical heat transfer direction, which transfers heat away from the valve housing.
If the vertical heat flux component is modeled, it will result in substantial reduction in the ASCO housing temperature.
The following additional information related to Question 5 is provided by TVA. The slab model of the cable was not used in our August 13, 1986 submittal to evaluate the cable. A two-dimensional HEATINGS model was -
developed by TVA.
This was not a slab model; rather it was a dimensionally accurate depiction of the cable within the limits of the code.
It is the results from the TVA model that are provided in section 6 of that report.
The results for the ASCO and MSIV solenoid valves and other components modeled provided in this report were also done with HEATING 5.
These models were developed along the same lines as the cable; that is, to depict the actual geometric and dimensional configuration of each of the components modeled.
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JLE 1 RVALUATION OF EQUIPMENT AND INTERNAL COMPONENTS.
j Equipment Identification Manufacturer Normal Preferred Function 1
Number Model No.
Operating Position During Performed
===================================================================================================================
Main Steam Isolation FSV-001-004A Gould Allied Open - Solenoids
. Closed - Solenoids Isointe Steam Valvo Thru FSV-001-004J 321X-21 energized De-energized Generator to control cooling FSV-001-029A Gould Allied Thru FSV-001-029J 321X-21 FSV-001-011A Gould Allied Thru FSV-001-011J 321PV-87973 (same as model 321X-21)
FSV-001-022A Gould Allied Thru FSV-001-022J 321PV-87973 (Same as model 321X-21)
(There is no C or I designation for these valves)
Valve - Auxiliary FCV-001-015 Limitorque Opened Either Valves isolate steam Fosdwater Pump FCV-001-016 SMB-00 Closed supply to turbine Turbine Steam Supply driven AFW pump from faulted steam generator.
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Valve - Auxiliary FCV-001-017 Limitorque Open Open Valves isolate steam-l Feedwater Pump FCV-001-018 SMB-00 supply to turbine Turbine Steam driven AFW pump for l
Supply break in AFW turbine steam supply line.
Required to remain open during MSLB.
Table 1, 2
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Equipment Identification Manufacturer Normal Preferred Function Number Model No.
Operating Position During Performed Position MSLB During i
======2========================================================================================================================;
i Valvo - Main Feed-FCV-003-033 Limitorque Open Closed Isolate Main Feed-Water Isolation FCV-003-100 SB-4 water to faulted FCV-003-047 steam generator.
FCV-003-087 In addition, valves serve as a backup to prevent steam generator overfill and to prevent loss of feedwater from the steas:
generator.
Main Steam Line FSV-001-147 Automatic Switch Closed - Solenoid Closed - Solenoid Solenoid valves are Warming Solenoid FSV-001-148 Company (ASCO)
De-energized De-energized only used during Valve FSV-001-149 206-381-2RVU start-up. Required FSV-001-150 to remain closed Steam Generator PCV-001-012 (LS)
NAMCO N/A N/A Indication only -
PORV Limit Switches PCV-001-023 (LS)
Model EA-180 Failure could affect PCV-001-005 (LS)
Category A MSLB PCV-001-030 (LS) equipment.
Steam Generator FSV-001-007 Automatic Switch Open - Solenoid Closed - Solenoid None-funtion is to Blowdown Isolation FSV-001-014 Company (ASCO)
Energized De-energized isolate blowdown Solenoid Valves FSV-001-025 206-381-3RVF line.
FSV-001-032 (FSV-001-014 unit I has model 206-381-RF but will be changed to i
206-381-3RVF before restart of Unit 1).
9 Storm Generator FSV-001-007 (LS)
Namco N/A N/A Indication only -
Blowdown Isolation FSV-001-014 (LS)
Model EA-740 20100 Failure could affect Limit Switches FSV-001-025 (LS)
Category A MSLB i
FSV-001-032 (LS) equipment.
DNEl - 2825Q NEB 12/11/86
Tsblo 1, 3
Equipmont Identification Manufacturer Normal Preferred Function Number Model No.
Operating Position During Performed Position MSLB During MSLB
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l Lsysl Control LSV-003-174 Automatic Switch Closed - Normally Modulating open Prevent steam generator Solanoid Valves LSV-003-175 C0apany (ASCO)
De-energized and closed.
overfill-206-381-2RVU i
1 l
Laval Control POS-003-174 Masonellan Inti Open Modulating open Prevent steam generator Valva Positioners POS-003-175 Inc.
and closed.
overfill i
M120 Junction Boxes 1-JBOX-991-1987-B N/A N/A N/A Protect Cables, 1-JBOX-991-1988-A JQD terminal blocks, and 2-JBOX-991-1998-A splices.
1-JBOX-991-1985-A 1-JBOX-991-3067-B 1-JBOX-991-3114-A 1-JB0X-991-3116-B 2-JBOX-991-1986-A 2-JB0X-991-3070-B 2-JBOX-991-3115-A i
2-JBOX-991-3117-B l
1 DNE1 - 2825Q NEB 12/11/86 i
Tablo 1, 4
Equipm:nt Id:ntificaticn N:nufceturer N:ranl Prefcersd Functica Number Model No.
Operating Position During Performed Position MSLB During MSLB
....=....==....==..................=.....................................................=
.................................=.e Junction Boxes (continued) 1-JBOX-991-2041-B N/A N/A N/A Protect cables, 1-JBOX-991-2042-A JXA terminal blocks, and 1-JBOX-991-2857-B splices.
1-JBOX-991-2858-A 2-JBOX-991-2890-B 2-JBOX-991-2891-A 2-JBOX-991-2892-B 2-JBOX-991-2893-A 1-JBOX-991-3041-A 1-JB0X-991-3042-A 1-JBOX-991-3061-A 1-JBOX-991-3065-B 1-JBOX-991-3066-B 2-JBOX-991-3062-A j
2-JBOX-991-3063-A 2-JBOX-991-3064-A 2-JBOX-991-3068-B 2-JB0X-991-3069-B l
2-JBOX-991-1997-B N/A N/A N/A Protect Cables, JQQ terminal blocks, and splices.
Terminal Connector SQN-XXX-TB-991 General Electric N/A N/A Connect Cabling Various terminal points as required.
Raychem Splices Raychem Corporation Raychem Corp.
N/A N/A Connect Cabling WCSF-N Series WCSF-N Series terminal points as required.
I DNE1 - 2825Q NEB 12/11/86
TABL EVALUATION OF EQUIPMENT AND INTERNAL COMPONENTS Equipment Identification Critical Discussion Number Component i
===========================================================================================================
Main Steam Isolation FSV-001-004A Solenoid Coil
-Valves are air operated, fail l
Valve Thru FSV-001-004J Viton Elastomer closed, with redundant normally i
energized solenoids that l
FSV-001-029A denorgize to close on a main Thru FSV-001-029J steam isolation signal.
De-energizing the solenoids will result in-closure of the MSIVs (the preferred position).
j FSV-001-011A
-The peak coil temperature during Thru FSV-001-011J the worst case MSLB (2850F) never exceeds the peak quali-j FSV-001-022A fication temperature of the coil Thru FSV-001-022J (360 0F).
J i
(There is no C or I
-The Viton Elastomers continuous j
designation of these service limits are 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at 6000F.
valves)
(Engineering Guide To Dupont Elastomers-Dupont &
J
)
Company.) This is 1650F greater than the worst case peak atmospheric temperature during an MSLB l
(i.e. 435 0F).
The Viton Elastomers peak temperature will never exceed the Gould Allied solenold's surface temperature of 365 0F (see Figure 2), which is 2350F less than the Viton's 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> continuous service limit.
l 1
i DNE1 - 2825Q NEB 12/11/86
h Tcblo 2, 2
Fquipment Identification Critical Discussion Number Component
=====.......==...............................=......=...=......................=.......................................-
Valve - Auxiliary FCV-001-015 Torque Switch
-Electro-mechanical operated Feedwater Pump FCV-001-016.
Limit Switch valves.
Turbine Steam Supply Terminal Block Jumper Wires
-During " Worst Case" MSLB 2
Viton Seals conditions (0.9 FT -1001 Motor windings power), the calculated peak surface temperature of the.
compartment housing the torque switch, limit switch, and terminal blocks is i
less than the peak surface temperature calculated for the qualification test.
(See Figure 5).
-The motor windings are enclosed in a j
housing and are massive when compared to other critical components on this device or most devices in the valve vaults. Therefore, the windings will not heat up as much during a MSLB as they did during the qualification test. Because of their mass and the results of analyses of other components; a detailed analysis was not considered necessary to establish qualification of the windings.
f DNEl - 2825Q
. NEB 12/11/86 1
i
)
~
i Tablo 2, Page 3 Equipment Identification Critical Discussion Number Component
........===================..=====================..-=====..=.....-==........................=======.
-The jumper wires have been replaced with TVA cable WJG-6 (reference SQN EQ binder SQNEQ-CABL-044). The calculated peak temperature during the I
worst case MSLB (2660F) is less than the peak qualification temperature (3400F-see Figure 6).
-The Viton Elastomers continuous service limits are 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at 6000 F. (Engineering Guide To Dupont Elastomers-Dupont & Company.)
j This is 1650F greater than the i
worst case peak atmospheric temperature during an MSLB (i.e.
435 0F).
The Viton Elastomers peak temperature will never exceed the Limitorque's surface temperature of 3480F (see Figure 5), which is 2500F less than the Viton's 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> continuous service limit.
DNEl - 2825Q NEB 12/11/86
b Tcble 2, 4
Equipment Identification Critical Discussion Number Component
..........................................=======....====......=.......................................
Valva - Auxiliary FCV-001-017 Torque Switch
-Electro-mechanical operated Fordwater Pump FCV-001-018 Limit Switch valves.
Turbine Steam Terminal Block Supply Jumper Wires
-During " Worst Case" MSLB 2
Viton Seals conditions (0.9 FT _loog Motor windings power), the calculated peak 1
surface temperature of the compartment housing the Torque switch, limit switch, and terminal blocks is less than the peak surface temperature calculated for the t
qualification test.
(See Figure 5).
-The jumper wires have been replaced with TVA cable WJG-6 (see SQN EQ binder SQNEQ-CABL-044). The calculated peak temperature during the worst case MSLB (2660F) is less i
than the peak qualification 0
j temperature (340 F-see Figure 6).
-The Viton Elastomers continuous I
service limits are 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at 6000F. (Engineering Guide To Dupont Elastomers-Dupont & Company.)
0 This is 165 F greater than the worst case peak atmospheric temperature during an MSLB (i.e.
4350F). The Viton Elastomers peak temperature will never.
exceed the Limitorque's surface temperature of 3480F (see Figure 5), which is 2500F less than the Viton's 48 hour5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> continuous service limit.
i DNE1 - 2825Q l
NEB 12/11/86
h Tchle 2, 5
Equipment Identification Critical Discussion Number Component
=============================================================================================
-Closure of the valves is manually initated.
DNE1 - 2825Q NEB 12/11/86
- - - - _ ~
~,_ -.
i h
Table'2,[
6 Equipment Identification Critical Discussion.
Number Component
.t Volva - Main Feed-FCV-003-033 Torque Switch
-Electro-mechanical operated i
i Water Isolation FCV-003-100 Limit Switch valves.
l FCV-003-047 Terminal Block l
FCV-003-087 Jumper Wires
-The SB-4 model Limitorque is more Viton Seals massive (2500 lbs.) than the
}
Motor windings
.model SMB-00.
SQN motor operated valve EQ Binder SQNEQ-MOV-002, page C1 states:
A qualification program was conducted by Limitorque Corporation to demonstrate that Limitorque motor operated valve actuators are capable j
of performing design basis safety functions under postulated accident conditions in a nuclear power plant.
The qualification program was conducted to encompass the entire family of actuators - SMB, SB, SBD, and SMB/HBC in all available unit sizes (SMB-000 to SMB-5). All sizes of actuators are constructed of the same materials with components designed to equivalent stress levels, l
same clearances, and tolerances with the only differences being in.
physical size which varies with unit rating. As such, analyses applicable j
to the SMB-00 are conservatively applicable to the model SB-4.
i
~
i DNE1 - 2825Q NEB 12/11/86 i
l j
2 Tcbis 2, 7
Equipment Identification Critical Discussion Number Component
=============================================================================================
t j
Main Steam Line FSV-001-147 Coil
-The peak coil temperature will Warming Solenoid FSV-001-148 Viton Elastomers never exceed its qualification l
Volva FSV-001-149 temperature. The normal operating FSV-001-150 temperature of an energized l
ASCO coil is approximately i
3610F (Reference SQN EQ binder SQNEQ-SOL-007) and the peak coil i
surface temperature for an unenergized solenoid during worst case MSLB is considerably lower.
I (See Figure 11.)
j
-The thermal activation energy of the j
Viton is higher than the activation
{
energy of the coil. Therefore, the
{
coil is more sensitive to thermal i
degradation than the elastomers.
Further, the Viton Elastomers continuous service limits are 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at 6000F.
(Engineering Guide To Dupont Elastomers-Dupont &
i
}
Company.) This is 1650F greater than the worst case peak atmospheric j
temperature during an MSLB (i.e.
4350F). The Viton Elastomers peak i
temperature will never exceed the ASCO surface temperature of 382 0F since the elastomers are unexposed.
-Therefore, unenergized ASCO's will function during worst case MSLBs j
with superheat.
J i
i I
l 4
DNE1 - 2825Q NEB 12/11/86
,b Tcblo 2, 8
Equipment Identification Critical Discussion Number Component
....=.....==..==.==..................=..........=...........=..................=......................
Stocm Generator PCV-001-012 (LS)
Terminal Block
-The Continuous service life FORV Limit Switches PCV-001-023 (LS)
Silicone Gasket of the silicone rubber gasket PCV-001-005 (LS) is 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> at 6020F. (Designing PCV-001-030 (LS) with Silastic Silicone Rubber - Dow Corning Co.). The maximum temperature of the silcone rubber gasket is 3900F. Therefore, no degradation of the silicone rubber will occur.
-The terminal block peak temperature during the worst case MSLB was determined to be less than the calculated temperature during the qualification test. (See Figure 16.)
The temperature at the terminal connectors was calculated to be 500F less during the MSLB than during qualification testing.
DNE1 - 2825Q NEB 12/11/86
~
~.
Ta
, Paga 9 Equipment Identification Critical Discussion Number Component i
...............=============================......................................======================
i Steam Generator FSV-001-007 Coil
-The peak coil temperature will Blowdown Isolation FSV-001-014 Viton Elastomer never exceed its qualification 1
Solenoid Valves FSV-001-025 temperature. The normal operating i
FSV-001-032 temperature of an energized ASCO coil is approximately t
0 361 F (Reference SQN EQ Binder i
SQNEQ-SOL-007) with a steady state housing temperature of 2990F. The 4
steady state surface temperature is within 300F of the peak atmospheric temperature during the early part of the MSLB transient.
Therefore, only a very small amount of heat is transferred to the surface of the ASCO with none being j
transferred to the coil during this portion of the transient.
(See l
Figure 9.)
The rate of heat generation in the coil (35 watts) l does not increase the coil temperature in the five minutes j
(maximum time) until.
j de-energization. After de-energization and before the i
atmospheric temperature exceeds the ASCO surface temperature, the coil t
begins to cool. After the l
atmospheric temperature exceeds the ASCO surface temperature, the coil i
temperature only returns to its j
normal steady state value by the end j
of the transient.
l I
i s
DNE1 - 2825Q NEB 12/11/86
Tcble 2 Page 10 Equipment Identification Critical Discussion Number Component
=============================================================================================
l
-The thermal activation energy of the i
Viton is higher than the activation energy of the coil. Therefore, the coil is more sensitive to thermal degradation than the elastomers.
Further, the Viton Elastomers i
continuous service limits are 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> at 6000F.
(Engineering Guide To Dupont Elastomers-Dupont &
l Company.) This is 1650F greater than the worst case peak atmospheric temperature during an MSLB (i.e.
4350F). The Viton Elastomers peak temperature will never exceed the ASCO surface temperature of 382 0F 1
since the elastomers are unexposed.
i i
i i
i i
l I
i 4
4 i
j DNE1 - 2825Q i
NEB 12/11/86 l
i I
b Tcble 2, 11 Equipment Identification Critical Discussion
+
Number Component
=============================================================================================
l Steca Generator FSV-001-007 (LS)
Terminal block
-The continuous service life of Blewdown Isolation FSV-001-014 (LS)
Silicone Rubber a silicone rubber gasket is j
Li=it Switches FSV-001-025 (LS) 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> at 6020F. (Designing FSV-001-032 (LS) with Silastic Silicone Rubber - Dow Corning Co.). The maximum temperature of the silcone rubber gasket is 3900F. Therefore, no degradation of the silicone rubber will occur.
-The terminal block peak temperature during the worst case MSLB was determined to be less than the temperature calculated during the qualification test. (See Figure 16.)
The temperature at the terminal connectors was calculated to 0
be 50 F less during the MSLB than during qualification.
4 DNE1 - 2825Q NEB 12/11/86 i
1
Tcble 2 12 Egulpment Identification Critical Discussion Number Component
...====.........=.......................................
2...................................,...........
Level Control LSV-003-174 Coil
-The LCVs throttle the AFW Solenoid Valves LSV-003-175 Viton Elastomer to automatically control the steam generator level and prevent overfilling. The operator can manually control the level should it become necessary by placing the turbine driven pump in the manual mode and throttling back pump flow or by tripping the AFW pump turbine.
-The peak coil temperature will never exceed its qualification i
temperature. The normal operating temperature of an energized ASCO coil is approximately 0
361 F (Reference SQN EQ binder SQNEQ-SOL-007) and the peak coil surface temperature for an unenergized solenoid during worst case MSLB is considerably lower.
1 (See Figure 11.)
.i 4
i f
DNE1 - 2825Q NEB 12/11/86 i
l Tcble 2, 13 Equipment Identification Critical Discussion Number Component
=============================================================================================
-The thermal activation energy of the Viton is higher than the activation energy of the coil. Therefore, the coil is more sensitive to thermal i
degradation than the elastomers.
Further, the Viton Elastomers continuous service limits are 48 I
hours at 6000F.
(Engineerins Guide To Dupont Elastomers-Dupont &
Company.) This is 1650F greater than the worst case peak atmospheric temperature during an MSLB (i.e.
4350F. The Viton Elastomers peak temperature will never exceed the ASCO surface temperature of 382 0F since the elastomers are unexposed.
-Therefore, unenergized ASCO's l
will function during worst case MSLBs with superheat.
i 1
l 1
's i
DNE1 - 2825Q NEB 12/11/86
Tcblo 2, 34 Equipment Identification Critical Discussion Number Component
=============================================================================================
Laval Control POS-003-174 Many components
-Because of the large number Valvo Positioners POS-003-175 of heat sensitive components the Masoneilans are being tested to the worst case MSLB profile.
-A type test of an unenergized Masonellan to the new valve vault atmospheric temperature has been performed. After testing the positioner was disassembled and inspected for signs of thermal distress. There was no indication of damage to any component except for a slight stretching of the diaphram.
The change observed would not affect operation of the device. Thus, we do not anticipate any problems with this device satisfactorily passing the MSLB qualification test.
I i
l DNE1 - 2825Q NEB 12/11/86
Table 2 16 Equipment Identification Critical Discussion Number Component
=============================================================================================
]
Terminal Connector SQN-IIX-TB-991 Phenolic
-The calculated peak temperature of the terminal block during the worst case MSLB was 3010F and is bounded by the calculated thermal response during equipment qualification testing (3150F).
I Raychem Splices Raychem Corporation Polyolefin
-The calculated peak temperature WCSF-N Series Adhesive in the interior of the smallest 1
junction box containing only air-j during the worst case MSLB was i
3330F with duration of less than 10
)
minutes The Raychem splices are qualified to 4000F for 20 minutes j
and 3550F for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 1
minutes (reference SQN EQ binder SQNEQ-SPLC-001). The peak I
temperature for the inside i
surface of a conduit is 3390F during the worst case MSLB.
l Thus, the qualification temperature of the Raychem splices is not exceeded.
I 1
l i
l DNE1 - 2825Q f
NEB 12/11/86 i
i
TAB CABLE Insulation Jacket Critical EQ Binder Manufacturer TVA Type Material Material
. Component Discussion
========================================================================================================
SQNEQ-CABL-002 AIW PXMJ, PXJ FR-EPDM CSPE TVA Cable
-TVA cable type PJJ was i
SQNEQ-CABL-003 AIW PX,PXJ,PXMJ FR-XLPE CSPE Type PJJ determined to have the SQNEQ-CABL-006 Anaconda MS FR-EPR CPE worst thermal-physical I
SQNEQ-CABL-012 Brand-Rex MS FR-XLPE CSPE properties of all the SQNEQ-CABL-015 Cyprus PJJ PE PVC cables in the valve SQNEQ-CABL-016 Rome CPJ, CPJJ XLPE PVC vaults. This cable has l
SQNEQ-CABL-017 Eaton MS FR-XLPO CSPE been qualified by test-J SQNEQ-CABL-020 Essex PJJ PE PVC ing to a temperature of SQNEQ-CABL-021 Essex PXJ, PXMJ FR-ERP CSPE 3470F.
SQNEQ-CABL-023 General Elec PXJ PXMJ FR-XLPE CSPE f
i SQNEQ-CABL-032 Plastic W&C CPJ, CPJJ XLPE PVC
-Testing by TVA has j
SQNEQ-CABL-034 Plastic W&C PJJ PE PVC demonstrated that the I
SQNEQ-CABL-036 Rockbestos SROAJ SR Braided temperature inside i
SQNEQ-CABL-049 Rockbestos MS XLPE CSPE conduits in the valve vaults will not exceed I
3470F during a MSLB.
-The calculated peak temperature in the interior of the smallest junction box during a MSLB was 0
333 F.
The box was analyzed assuming it contained only air.
Thus, the peak l
temperature of cable i
located in a junction box would be less than
]j the qualification temperature even if it j
was in contact with the wall of the box.
1 DNE1 - 2825Q NEB 12/11/86
TABLE 4 ADDITIONAL MATERIAL PROPERTIES I(g Temperature Density Conductivity 3
Material (F)
(LBM/FT )
(BTU /Hr FT F)
AIR
-10
.0882
.01287 80
.0735
.01516 170
.0623
.01735 260
.0551
.01944 350
.0489
.02142 440
.0440
.02333 530
.0401
.02519 620
.0367
.02692 710
.0339
.02862 CARBON 32 32.
STEEL 212 30.
392 28, 572 26.
752 24.
STAINLESS 32 8.0 STEEL 212 9.4 572 10.9 932 12.4 4
h J
~
- - - - - - - - - - - = - - - - - ~ -
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o ci 4
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0.0 300.0 200.0 300.0 400.0 500.0 600.0 700.0 800.0 000.0 1000.0 1107 0 1200.0 1300.0 1400.0 TIME (sec) l FIGURE 6 I
6-.4m__, _..
ENERGIZED ASCO SURFACE TEMPERATURE DURING EQ TEST AND MSLB E
64
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FIGURE 8 1
j
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0 0
R 00 I
5 S
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E 0.0 500.0 1000.0 1500.0 2000.0 2500.0 3000.0 3500.0 4000.0 4500.0 5000.0 TIME (sec) 4 FIGURE 10
?
I
UNENERGIZED ASCO COIL TEMP. DURING EQ TEST AND MSLB O.
o 1
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- 0 5000 1000.0 1soa.o soon,o
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