ML18086B071

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Forwards Proprietary Version of Reactor Protection Sys & ESF Actuation Sys Setpoint Methodology. Rept Withheld (Ref 10CFR2.790)
ML18086B071
Person / Time
Site: Salem PSEG icon.png
Issue date: 11/20/1981
From: Liden E
Public Service Enterprise Group
To: Varga S
Office of Nuclear Reactor Regulation
Shared Package
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NUDOCS 8111270176
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PS~G Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 Phone 201/430-7000 November 20, 1981 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD 20014 Attention: Mr. S. A. Varga, Chief Operating Reactors Branch 1 Division of Licensing Gentlemen:

INSTRUMENT TRIP SETPOINT METHODOLOGY NO. 2 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-311 PSE&G hereby submits five (5) copies of its report related to Reactor Protection System and Engineered Safety Features Actuation System Setpoint Methodology, pursuant to paragraph 2.c(5) of Facility Operating License DPR-75.

This report contains information which is proprietary to the Westinghouse Electric Corporation. Accordingly, we request that this report be withheld from public disclosure pursuant to section 2.790 of the Commission's regulations.

In order not to delay this submittal of information requested by the Commission, we will comply with the requirements of 10CFR2.790 to provide proprietary and non-proprietary versions together with an aff idavi4 as soon as Westinghouse specifically identifies the proprietary information contained in the report and provides us with an affidavit. We will submft ten (10) copies each of the proprietary and non-proprietary versions of the report and the required affidavit at that time. In the meantime,

~A~ 1270176 p

s-11120)

ADOCK 0500031 l

  • PDR 1 95-2001 (400M)

'a U.S. Nuclear Regulatory Commission 11/20/81 we are providing the enclosed copies of the proprietary report for your review. Westinghouse has advised us that this procedure has been dis-cussed with Mr. E. Shomaker of the Office of the Executive Legal Director, and that he concurs.

A copy of this submittal is being sent to Westinghouse requesting them to specifically identify the proprietary information and to supply the required affidavit. Westinghouse has advised us that they will be able to return the report and affidavit to us within a week of their receipt of the report. Westinghouse advises us that the file number for the pending and properly executed format will be CAW-81-84.

Very truly yours, Enclosures

/E

~

  • A. Li'd en Manager - Nuclear Licensing CC Mr. Leif Norrholm Senior Resident Inspector Mr
  • Gary C. Meyer Licensing Project Manager

I '* ....' _

I 0 NOVEM!lER 1961 I PS~G I The Energy People I SALEM NUCLEAR GENERATING STATION UNIT NO. 2 I

I I REACTOR PROTECTION SYSTEM AND I ENGINEERED SAFETY FEAT.URES ACTUATION SYSTEM

  • ,,., SETPOINT METHODOLOGY I

1 - - - - - - - - - - - - - - - - ---*- __________ -PROPRIETARY I *------.-';

I ~NOTICE -

I THE ATTACHED FILES ARE OFFICIAL RECORDS OF THE DIVISION OF DOCUMENT CONTROL. THEY HAVE BEEN CHARGED TO YOU FOR A LIMITED TIME PERIOD AND MUST BE RETURNED TO THE RECORDS FACILITY I

BRANCH 016. PLEASE DO NOT SEND DOCUMENTS CHARGED OUT THROUGH THE MAIL. REMOVAL OF ANY PAGE(S) FROM DOCUMENT FOR REPRODUCTION MUST B~ REFERRED TO FILE PERSONNEL.

  • I I DEADLINE RETURN DATE 1J I 8/1/dl{J/?6 RECORDS FACILITY BRANCH

.~I P R0 P R I E T AR Y

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I I REACTOR PROTECTION SYSTEM AND

.I ENGINEERED SAFETY FEATURES ACTUATION SYSTEM SETPOINT METHODOLOGY

_I SALEM UN IT #2 I

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P R0 P R I E T A R Y I -----------

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,, TABLE OF CONTENTS I

I SECTION TITLE PAGE 1

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1.0 INTRODUCTION

2.0 COMBINATION OF ERROR COMPONENTS 3 I 2.1 Methodology 3 2.2 Sensor Allowances 4 I 2.3 Rack Allowances 6 I 3.0 RESPONSE TO NRC QUESTIONS Approach 8

8 3.1 I 3.2 Definitions for Protection System Setpoint Tolerances 8

  • I 3.3 NRC Questions 14 I NOTES FOR TABLE 3-4 20 I

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.1 _...........-~--------------- - ...... - **

~---*~~~---:....---*------*- - -

  • __ ..............,... -~--

-1 -----------

P R0 P R I E T A R Y I

-~-

I LIST OF TABLES I

I TABLE TITLE PAGE I' 3-1 Tavg Channel Accuracy 15 Overtemperature 6T Channel Accuracy I 3-2 16 3-3 Overpower 6T Channel Accuracy 18 I

3-4 Reactor Protection System/Engineered Safety I Features Actuation System Channel Error Allowance 21 I 3-4A Planned Revisions to Table 3-4 25 I

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1 I P R0 P R I E T AR Y I

1.0 INTRODUCTION

I The Salem No. 2 full power operating license contains Condition 2.c(5) which requires PSE&G to submit a response to a series of NRC questions on setpoint I' methodology. This document contains the Westinghouse IT'ld Public Service I Electric and Gas response to those questions.

  • I' The infonnation desired pertains to the various instrument channel components' analysis assumptions, i.e., a channel breakdown and values, for the Reactor I Protection System (RPS) and the Engineered Safety Features Actuation System (ESFAS). Some of the infonnation requested is already available in public I documents, e.g., Chapter 14 of the Safety Analysis Report. The rest of the I infonnation has not been released and is drawn from equipment specifications or analysis assumptions. This 1nfonnation is considered proprietary by West-I inghouse and is noted as such.

I The basic underlying assumption used is that several of the error components and their parameter assumptions act independently, e.g., E-ack versus sensors I and pressure/temperature assumption!] ta,c. This allows the use of a statis-tical surrmation of the various breakdown components instead of a strictly I arithmetic surrmation. A direct benefit of the use of this technique is in-I creased margin in the total allowance. For those parameter assumptions known to be interactive, the technique uses arithmetic surrmation, e.g., (!lrift and I calibration erro~ ta,c. The explanation of the overall approach is provided 1n Section 2.

I Section 3 presents the infonnation requested along with three examples of in-I dividual channels, Ta?g, Overtemperature 6T, and Overpower AT. Also located I

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2 I

1n this section are descriptions, or definitions, of the various parameters I used. This insures a clear understanding of the breakdown presented; 1n

,1 nearly all cases a significant margin exists between the statistical sunrna-tion and the total allowance *

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I - * . .. - * *- , . ~ . - .I * *

,-~~~~-~~--=~~-.~--~~~~~~~~~~~~~--~~~~-------~---- '3

!R~!!!~TA!!

I 2.0 COMBINATION OF ERROR COMPONENTS I 2.1 Methodology I The methodology used to combine the ~rror components for a channel is basi-cally the appropriate statistical combination of those groups of components I which are statistically independent, i.e., not interactive. Those errors which are not independent are sunmed arithmetically into groups. The groups I themselves are independent effects which can then be systematically combined.

I The methodology used for this combination is not new. Basically it is the

~square root of the sum of the squares:::) ta,c,e which has been utilized in I other Westinghouse reports. This technique, or other statistical approaches I of a similar nature, have been used in WCAP-9180(l) and WCAP-8567( 2). It should be noted that WCAP-8567 has been approved by the NRC Staff thus noting I the acceptability of statistical techniques for the application requested.

It should also be recognized that the approach used in this document was sub-

  • I mitted on the D. C. Cook Unit No. 2 Docket (50-316) and approved by the NRC 11 Staff in a letter dated February 12, 1981. Thus it can be seen that the use of statistical approaches in analysis techniques is becoming more and more I widespread.

I The relationship between the error components and the total statistical error allowance for a channel is, I ~otal_ Error~ EA+\J(PMA) 2+(PEA) 2+(SCA+SD) 2+(STE} 2+(SPE) 2+(RCA+RCSA+RD} 2+(RTE)~ta,c I . (Eq. 2.1)

(1) Little, C. C., Kopel1c, S. D., and Chelemer, H., "Consideration of Un-certainties in the Specification of Core Hot Channel Factor Limits."

I WCAP-9180 (Proprietary), WCAP-1981 (Non-proprietary), September, 1977.

(2) Chelemer, H., Bowman, L. H., and Sharp, D. R., "Improved Thermal Design I Procedure, "WCAP-8567 (proprietary), WCAP-8763 (Non-proprietary}, July, 1975.

I.

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  • 1 where:

PMA

  • Process Measurement Accuracy I PEA
  • Primary Element Accuracy SCA
  • Sensor Calibration Accuracy I' SD
  • Sensor Drift STE = Sensor Temperature Effects I SPE RCA

=

=

Sensor Pressure Effects Rack Calibration Accuracy I RCSA RD

=

=

Rack Comparator Setting Accuracy Rack Drift RTE = Rack Temperature Effects I EA = Environmental Allowance I As can be seen in Equation 2.1, ~rift and calibration accurac.Y.J ta,c allow-ances are interactive and thus not independent. The (!nvironmental allowanc~ta,c I is not necessarily considered interactive with all other parameters, but as an I added degree of conservatism is added arithmetically to the statistical sum.

  • 1: 2.2 Sensor Allowances Four parameters are considered to be sensor allowances, SCA, SD, STE, and I SPE (see Table 3-4). Of these four parameters, two are considered to be independent,~TE and SP~ ta,c, and two are considered interactive r=sD and

'I SC~ ta,c. ~TE and SP~ ta,c are considered to be independent due to the

1. manner in which the instrumentation is checked, i.e., the instrumentation is

~alibrated and drift detennined under conditions in which pressure and tem-I; perature are assumed constan(J ta,c. An example of this would be as follows:

[jet's say a sensor is placed in some position in the containment during a I refueling outage. After placement, an instrument technician calibrates the

.::tta ,c I sensor. This calibration was perfonned at ambient pressure and temperatu~

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,-~~,-:-~=*Y=~--~-

.5 1 ~onditions. Some time later with the plant shutdown, an instrument technician I checks for sensor drift. Using the same technique as for calibrating the sensor, the technician detennines if the sensor has drifted or not. The con-

.I' ditions under which this detennination is made are again at ambient pressure and temperature conditions. Thus the temperature and pressure have no impact I on the drift detennination and are, therefore, independent of the drift allow-I ance] ta,c. ~D and ScA] ta,c are considered to be, interactive for the same reason that ~TE and SPE:Jta,c are considered independent, i.e., due to the I manner in which the instrumentation is checked. C:instrument calibration techniques use the same process as detennining instrument drift, that is the I end result of the two is the same. When calibrating a sensor, the sensor out-I put is checked to detennine if it is representing accurately the input. The same is done for a detennination of the sensor drift. Thus it is impossible to I detennine the differences between calibration errors and drift when a sensor is checked the second or any subsequent tim~ ta,c. Based on this reasoning, I ~D and SC~ta,c have been added to fonn an independent group which is then I factored into Equation 2.1. An example of the impact of this treatment is; for Pressurizer Water Level-High {sensor parameters only):

.1 ta,b,c 1 SCA SD

=

=

0.5 1.0 STE = 0.5 I SPE i::

0.5 Using Equation 2.1 as written gives a total of; I ta,c I ~(SD + SCA) 2 + (STE) 2 + (SPE) 2

~(1.0 + 0.5) 2 + (0.5) 2 + (0.5) 2 = 1. 66 percent I

I P R0 P R I E T AR Y

6 I' Assuming no interactive effects for any of the parameters gives the follow-1ng results:

I ;ta,c

~(SCA) 2+ (SD) 2 + (STE) 2 + (SPE) 2 I (Eq. 2.2)

(0.5) 2 + (1.0) 2 + (0.5) 2 + (0.5) 2 = 1. 32 percent I Thus ft can be seen that the approach represented by Equation 2.1 which I accounts for interactive parameters results in a more conservative sunmation of the allowances.

I 2.3 Rack Allowances I Four parameters. as noted by Table 3-4. are considered to be rack allowances.

~CA, RCSA, RTE, and RD

  • Three of these parameters are considered to be I interactive (for ~uch the same reason outlined for sensors in 2.2). r:RCA, I RCSA, and Ro]ta,c. [when calibrating or detennining drift in the racks for a specific channel. the processes are perfonned at essentially constant temperature, i.e., ambient temperature. Because of this, the RTE parameter is considered to be independent of any factors for calibration or drift.

However. the same cannot be said for the other rack parameters. As noted in 2.2, when calibrating or detennining drift for a channel, the same end result is desired, that is at what point does the bistable change state. After initial calibration it is not possible to distinguish the difference between a calibration error, rack drift or a comparator setting error:Jta,c. Based on this logic, these three factors have been added to form an independent group. This group is then factored into Equation 2.1. The impact of this approach (fonnation of an independent group based on interactive components) is significant. For the same channel using the same approach outlined in Equations 2.1 and 2.2 the following results are reached:

---~~?' .~- ----- t> - -a !n£!w _llJillre .........

I P R0 P R I E T ARY

7 I ta,b,c RCA ~ 0.5 percent I RCSA ~ 0.25 percent RTE ~ 0.5 percent I RD = 1.0 percent using Equation 2.1 the result is:

I I ~ (RCA + RCSA + RD) 2 + (RTE) 2 I ~ (0.5 + 0.25 + 1.0) 2 + (0.5) 2 = 1. 82 percent I' Assuming no interactive effects for any of the parameters yields the follow-ing less conservative result; I ta,c I ~ (RCA) 2 + (RCSA) 2 + (RD) 2 + (RTE) 2 (Eq. 2.3)

~ (0.5) 2 + (0.25) 2 + (1.0) 2 + (0.5) 2 = 1.25.percent I

Thus the impact of the use of Equation 2.1 is even greater in the area of I rack effects than for the sensor. Therefore, accounting for interactive I effects in the statistical treatment of these allowances insures a conservative result.

I Finally, the PMA and PEA parameters are considered to be independent I of both sensor and rack parameters. PMA provides . allowances for the non-instrument related effects. e.g., neutron flux, *calorimetric :*power error I assumptions, fluid density changes, and temperature stratification assump-1 tions. PEA. accounts for due *to meterfng devices, such ts elbows and

~rrors venturies. Jhus. these parameters have been statistically factored into Equation 2.1

  • I

P R0 P R I E T ARY 8 I -----------

I 3.0 RESPONSE TO NRC QUESTIONS

  • I 3.1 Approach As noted in Section One, Westinghouse utilizes a statistical sunrnation of I the various components of the channel breakdown. Thi$ approach is valid where no dependency is present. An arithmetic sunmation is required where I an interaction between two parameters exists, Section Two provides a more I detailed explanation of this approach. The equation used to determine the margin, and thus the acceptability of the parameter values used, is:

I ta,c I Grgin=(TA)-0 +. (PMA) 2+(PEA) 2+(SCA+SD) 2+(SPE) 2+(RCA+RCSA+RD) 2+RTE~

(Eq. 3.11-I where:

  • TA = Total Allowance , and I all other parameters are as defined for Equation 2.1.
  • 1 Tables 3-1 through 3-3 provide examples of individual channel breakdowns and margin calculations for Tavg., Overtemperature 6T, and Overpower 6T. It I should be noted that only those channels which Westinghouse takes credit for I in the analysis are provided with detailed breakdowns. For those channels not assumed to be primary trips, there are no Safety Analysis Limits, thus no I Total Allowance or Margin can be determined.

I 3.2 Definitions for Protection System Setpoint Tolerances To insure a clear understanding of the channel breakdown used by Westinghouse 11 in this report, the following definitions are noted:

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I

...,.-.--.~-------*-*~-*--, .. ----~---- -- -.

I. 9 I 1. Trip Accuracy The tolerance band containing the highest expected value of the differ-I ence between (a) the desired trip point value of a process variable and

  • 1 (b) the actual value at which a comparator trips (and thus actuates some desired result). This is the tolerance band, 1n ~ercent of span, within I which the complete channel must perform its intended trip function.

It includes comparator setting accuracy, channel accuracy (including the I sensor) for each input, and environmental effects on the rack-mounted electronics. It comprises all instrumentation errors; however, it does I not include process measurement accuracy.

I 2. Process Measurement Accuracy I Includes plant variable measurement errors up to but not including _the sensor. Examples are the effect of fluid stratification on temperature I measurements and the effect of changing fluid density on level measure-ments.

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3. Actuation Accuracy I Synonymous with trip accuracy, but used where the work "trip" does not apply.

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4. Indication Accuracy The tolerance band containing the highest expected value of the differ-I ence between (a) the value of a process variable read on an indicator or recorder and (b) the actual value of that process variable. An indica-tion must fall within this tolerance band. It includes channel accuracy, accuracy of readout devices, and rack environmental effects, but not process measurement accuracy such as fluid stratification. It also assumes a controlled environment for the readout device.

- .... --.**~ -* -*'"'( - -*-* *-* -- .

I P R0 P R I E T AR Y

10 I 5. Channel Accuracy The accuracy of an analog channel which includes the accuracy of the I primary element and/or transmitter and modules 1n the chain where cali-I bration of modules 1ntennediate fn a chain 1s allowed to compensate for errors in other modules of the chain. Rack environmental effects are I' not included here to avoid duplication due to dual inputs, however, nonnal environmental eff~cts on field mounted hardware is included.

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6. Sensor Allowable Deviation I The accuracy that can be expected in the field. It includes drift, tem-perature effects, field calibration and for the case of d/p transmitters, I an allowance for the effect of static pressure variations.

I The tolerances are as follows for the original sensors installed in the Westinghouse supplied systems:

I a. Reference (calibration) accuracy-' (+/-0.SJtabc percent unless other

  • ,I data indicates more inaccuracy. This accuracy is the SAMA refer-ence accuracy as defined in SAMA standard PMC-20-l-1973(l).
b. Temperature effect - [o.~ tabc percent based on a nominal temper-ature coefficient of [+/-tJ tabc percent/l00°F and a maximum assumed change of so°F.
c. Pressure effect - usually calibrated out because pressure is con-stant. If not constant, nominal (+/-0.5) tabc percent is used.

Present data indicates a static pressure effect of approximately

[+/-1.0J tabc percent/1000 psi.

d. Drift - change in input-output relationship over a period of time at reference conditions (e.g., [constant temperatureJta,c -

( :tl percenfl tabc of span).

The above values are based on Westinghouse te~t data.

11 11 I PSE&G has replaced the original Westinghouse supplied sensors with Rosemount sensors in the following protection channels:

I Pressurizer Pressure - Low Reactor Trip Pressurizer Pressure - High I Low Trip System Pressure - Turbine Trip Pressurizer Pressure - Low Safety Injection I Differential Pressure Between Two Steamlines - High Steam Flow in Two Steamlines - High I Steamline Pressure - Low The tolerances for the sensors in the above protection channels, based on I Rosemount specifications, are as follows:

a. Reference {calibration) accuracy is +/-.25 percent. This is the reference I accuracy as defined in SAMA Standard PMC-20-l-1973{l)_

I b. Temperature effect - +/-.625 percent based on +/-1.25 percent/100°F and maximum assumed change of 50°F.

I c. Pressure effect - usually calibrated out because pressure is constant.

If not constant, nominal +/-.625 percent based on a static pressure effect

  • I of +/-1.25 percent/1000 psi.

I d. Drift - Change in input-output relationship over a period of time at

J ta,c reference conditions {e.g.~onstant temperatu~) - +/-.25 percent of I upper range limit for six months.

I PSE&G is planning to install Rosemount transmitters with the above tolerances into the following protection channels:

I' Pressurizer Water Level - High Steam Generator Water Level - Low Low I Steam Generator Water Level - Low Containment Pressure - High I Containment Pressure - High High Steam Generator Water Level - High High I Table 3-4A is included herein to reflect the planned changeout of pre-sure transmitters in the above channels.

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,~

~.--....-....._ __________________ -~---*----~***

12 I 7. Rack Allowable Deviation I The tolerances are as follows:

a. Rack Calibration Accuracy I The accuracy that can be expected during a calibration at reference conditions. This accuracy is the SAMA reference accuracy as defined I in SAMA standard PMC-20-1-1973(l}. This includes all modules in a rack and is a total of ~+/-0.~ tabc percent of span assuming the I chain of modules is tuned to this accuracy. For simple loops where I a power supply (not used as a converter} is the only rack module, This accuracy may be ignored. All rack modules individually must I have a reference accuracy within [!o.s:Jtabc percent.

.,I *. b. Rack Environmental Effects Includes effects of temperature, humidity, voltage, and frequency changes of which temperature is the most significant. An accuracy of [_+/-o.~ tabc percent is used which considers a nominal ambient I temperature of 70°F with extremes to 40°F and 120°F for short I c.

periods of time.

Rack Drift (instrument channel drift} - change in input-output rela-I tionship over a period of time at reference conditions (e.g., ~on stant temperatur~ ta,c} - +/-1 percent of span.

I d. Comparator Setting Accuracy I Assuming an exact electronic input, (Note that the channel accuracy takes care of deviations from this ideal}, the tolerence on the pre-

  • 1 cision with which a comparator trip value can be set, within such practical constraints as time and effort expended in making the I setting.

I

{1} Scientific Apparatus Manufacturers Association, Standard PMC-20-1-1973, I "Process Measurement and Control Tenninology. 11

P R0 P R I E T AR Y 13 I -----------

I The tolerances are as follows:

(a) Fixed setpoint with a single input - ~0.2~ tabc percent accuracy.

I This assumed that comparator nonlinearities are compensated by the setpoint.

I (b) Dual input - an additiona1~0.2s:Jtabc perc~nt must be added for comparator nonlinearities between two inputs. Total ~0-~ tabc I percent accuracy.

II Note: The following four definitions are currently used in the Standardized Technical Specifications (STS).

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8. Nominal Safety System Setting I The desired setpoint for the variable. Initial calibration and subsequent I recalibrations should be made at the nominal safety system setting ("Trip Setpoint" in STS).

I 9. Limiting Safety System Setting

  • I A setting chosen to prevent exceeding a Safety Analysis Limit ("Allowable Values" in STS). {Violation of this setting represents an STS violation).

I 10. Allowance for Instrument Channel Drift

.I The difference between (8) and (9) taken in the conservative direction.

I 11. Safety Analysis Limit The setpoint value assumed in safety analyses.

I 12. Total Allowable Setpoint Deviation Same definition as 9, but the difference between 8 and 12 encompasses

[6 and 7]. ta,c

_____ .,.._."l\o""'._--.. -.....-~ . .,,...,.....__,.,.__ _ _ _ _ _r r - _ .. ,

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3.3 NRC Questions I The infonnation requested by the NRC for each channel is:

I 1. What is the technical specification trip setpoint value?

2. What is the technical specification allowable value?

I 3. What instrument drift is assumed to occur during the interval between technical specification surveillance tests?

I 4. What are the components of the cumulative instrument bias (e.g., instru-I ment calibration error, instrument drift, instrument error, etc.)?

5. What is the margin between the sum of the channel instrumentation error

.1 allowances and the total instrumentation error allowance assumed in the accident analysis?

I The Westinghouse and PSE&G response to these questions is:

I. a. The response to Question 1 will be found as Column 14 of Table 3-4 in I this section.

b. Column 13 of Table 3-4 provides the information requested in Question 2.

I c. The instrument drift assumed is the difference between the trip setpoint and the allowabl~ value in the technical specifications, this can be I found as Column 11 of Table 3-4.

I d. The bulk of Table 3-4 provides the breakdown values required by Question 4.

e. The margin requested by Question 5 is noted in Column 17 of Table 3-4.

1 It should be remembered that responses are provided only for I those channels for which credit is taken in the accident analysis. Again this 1s due to the fact that Question 5 cannot be answered if the channel is not a I primary trip.

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I TABLE 3-1 I

,, Parameter Tavg Channel Accuracy Allowance*

I Sensor Calibration Th + T  :-1 ta,c I

[ RTDs +/-0.2°F ( 2 c:.J +/-0.2 tabc Sensor Drift I (!TDs - no drif~ta,c 0.0 I Comparator One input +/-0.25 I Rack Calibration f'RT"o R/I converter (0.5% of 120°F span}fa,c I l__ Tavg +/-0.36% + +/-:0.36% (gain = 0.6L.J +/-0.72 I Rack Accuracy Tavg channel +/-0.5 I Total Tavg +/-1.22 Rack Temperature Effect +/-0.5 I Rack Drift +/-2.0 Process Measurement Error I [ravg +/-1°!] ta .c +/-1.0 I *in percent of span

  • I The margin, based on Equation 3.1, is calculated as follows:

~ 1.0) 2+(0.o) 2+(0.D+0.2) 2+(o.o) 2+(1.22+0.2s+2.0) 2+(o.s) 2+o.ol* tabc I + (!.7~ tabc. The Total Allowance is 4.0%, thus the margin is

~.0.3~ ta,b,c of span.

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I f. R 0 f.B_!g_ TA Ji!. 16 I TABLE 3-2 Overtemperature 6T Channel Accuracy I Parameter Allowance*

I Seiso: ~::b~~::: (Th ~ Tel . ~,c +/-0.2 tabc I Pressure Sensor +/-0.5% (4 psi} with a gain of 0.05°F/ps~ +/-0.2

,, Sensor Temperature Effect rD . 71a,c t!:ressure Sensor +/-0.5% (4 psi) with a gain of o.o5°F/ps.2.J Sensor Drift

+/-0.2 iRTDs no drift

-ia, 0.0 I l..fressure Sensor +/-1.0% (8 psi) with a gain of o.os°F/p~ +/-0.4 Rack Calibration I

L TD R/l converters (0.5% of 120°F spanj ta,c AT +/-0.6% + +/-0.6% (gain = 1} +/-1.2 I Tavg +/-0.36% + +/-0.36% (gain = 0.6)

Rack Accuracy

+/-0.72 I AT Channel Tavg Channel

+/-0.5

+/-0.5

      • 1, Total AT Channel +/-1. 7 Tavg Channel +/-1.22 I Comparator Two inputs +/-0.5 I Rack Temperature Effects +/-0.5 Rack Drift I AT Channel Tavg Channel

+/-1.0

+/-1.0 I Calorimetric Error (used to calibrate 6Tl

~% of nominal full power (-65°FIJta,c +/-1.3 I Process Measurement Error

(!avg +/-l.0°F x (1.0) typical gai~ta,c +/-1.0

~ - *in percent of span, (100°F span = 150% power)

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TABLE 3-2 (Cont'd)

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I The Margin, based on Equation 3.1. is calculated as fo11ows:

ta,b I ~~(l.0) 2+(1.3) 2-(l.4+0.4; 2+(0.0) 2+(0.2) 2+(1.7+0.25+1.0) 2+(1.22+0.25+1.0) 2+(0.5) 2+o~

,. = (!.3%::J ta,c.

span.

The Total Allowance is 7.0%, thus the margin is {Z.7~ ta,c of I

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I P R0 P R I E T A R Y 18 I TABLE 3-3 I Overpower AT Channel Accuracy I Parameter Sensor Calibration I r: Th + g ta,c t.: RTDs +/-0.2°F { 2 ~ +/-0.2 tabc Sensor Drift I (!Tos - no drifD ta,c o.o Rack Calibration I D R/l converter (0.5% of 120°F spad) ta,c I C AT +/-0.6% + +/-0.6% (gain = 1) .

Tavg +/-0.36% + +/-0.36% (gain = 0.6)

Rack Accuracy

+/-1.2

+/-0.72 I AT Channel Tavg Channel

+/-0.5

+/-0.5.

I Total tiTChannel +/-1.7 I Comparator Tavg Channel +/-1.22 Two inputs +/-0.5 I Rack Temperature Effect +/-0.5 Rack Drift I t.T Channel Tavg Channel

+/-1.0

+/-1.0 Calorimetric Error {used to calibrate AT)

~% of nominal power (*6s°FIJta,c +/-1.3 Process Measurement Error

[!avg +/-l.0°F x (0.01) typical ga~a,c +/-0.1

  • 1n percent of span, (l00°F span = 150% power)

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I TABLE 3-3 (Cont'd)

I The margin based on Equation 3.1 1s calculated as follows:

I

[ (1.3) +(0.1) 2+( O. 2) 2+(0.0) 2+(0. 0) 2+( 1. 7+0.25+1.0) +( i.22+0. 25+1.0) +( o. 5) 2+o~ tabc I = ~.l!J tabc. The Total Allowance is 4.5%, thus the margin is [Q.4!} tabcof I span.

I I

I I

  • I I

I I

I

1 I

I I .....

---...==~--=***~.,*-~*.~>q~

... &ZJQJ~#~.£!!'.l

  • ~*~'!?>>~"'~~r+..~.<s~.~==~w~~~-~'Ol.'.::.-;.:'._'.':*"-'-~

... =.-:*~=--=-=-=== -*-. :. . ,.-*. *_.. ., .*-* -* -* *- . . .

-~

~

f.R.Q.f.Rl~ TA.B_l 20

  • .I I NOTES FOR TABLE 3-4 I

(1) All values in percent span.

I (2) As noted in Table 14.1-3 of SAR.

I (3) As noted in TabJe 2.2-1 and 3.3-4 of Westinghouse STS.

( 4) Included in (i.7% Calorimetric allowance in Process Measurement I Accurac.LJ ta,c (5) Not used in the Safety Analysis.

I (6) As noted in Figure 14.1-1 of SAR.

I (7)

(8)

As noted in Notes 1 and 2 of Table 2.2-1 of Westinghouse STS.

C:Calorimetric allowanc~ ta,c I (9) Venturi.

(10) Not Westinghouse scope.

I ( 11) Included in frocess Measurement Accuraci:J ta,c

    • 1 (12) As noted in Table 3.3-4 of Westinghouse STS.

(13) Does not impact Safety Analysis results.

  • I (14) Trip setpoint function of note (12) plus 10%.

(15) Included in (i.rocess Measurement Accurac~ ta,c I (16) Not found in Table 14.1-3 of SAR but used in Safety Analysis.

(17) [nvironmental Allowance on one transmitter only because of I locatio~ ta,c I (18) [!ise of a rate (derivative) eliminates sensor steady state errorS! ta ,c I

I I .. **---~--.-.---***-*--- . . -- . - I

- -*- - - - - - - -* - - - - - ~

~

~

TABLE 3-4

-- ~

I REACTOR PROTECTION SYSTEM/ENGINEERED SAFETY FEATURES ACTUATION SYSTEM CHANNEL ERROR ALLOWANCE 1 l

.  !  !  !  ! 1.

Sensor (PM) (PEA)

Process PriNl'J (SCA) (SPE) (STE) (EA)

Measureaent Ell!IM!nt C1 Hbratton Pressure Teq>erature (SD) Envtf'OMHtal Protectton Channel Accurac.i l 1} Accur1c.i l lJ Accuracx [lJ Effects [ll Effects (ll Drtft Ill Allowance (lJ

,.... lt.lltge, Neutron Flux-Htgll*Setpotnt 1.718~ A 4.2 ( 4) (4) ~4)

Polfer Range, Neutron Flux-low Setpotnt Polfer Range, Neutron Flux-Htgh Postttve 1.7 8 A 4.2 (4) l!J ( 4) 4)

Rate (18) (18) (18) (18) (18)

Polfer Range, Neutron Flux-Htgtt Negative lnterwdtate Range, Neutron Flux Source Range, lleutron Flux Rite (18) 8.4 ~18) 15J i18) 15l BU 118) 15~

10.0 15 15 15 OYer~rature AT AT Chlnnel 1.3(8)

Tavg Channel 0.2 Owerpo111r AT Pressurtzer Pressure Channel AT Channel

1. O 1.3(8) 0.2 0.2 0.4 }--

T Channel 0.1 0.2 0.25 0.625 0.5 Pressurizer Pressure-High 0.25 0.625 0.5 Pressurizer Water Level-Htgh 2.0 0.5 0.5 0.5 1.0 Loss of Flow 0.5 0.5 o.5 0.5 1.0 Ste* &enerator Mater Llftl

  • Low-low 2.0 0.5 0.5 0.5 1.0 +13.0 Stelll/Feedwater Flow MtSllltch Ste* Flow 3.0 0,5 0.5 o.s 1.0 +10.0(17)

Feed Flow 0.5(9J 0.5 0.5 0.5 1.0.

Ste9 Generator Water lewel-low 2.0 0.5 0.5 0.5 1.0 Undenoltnge - RCP Underfrequency - RCP Low Trtp Systell Pressure-Tul1>>tne Trtp Tul1>>tne Stop Valve Closure-Turbtne Trtp o.s

....1.0 o:s* ...

N

]

Contaiment Pressure-High [ 0.5 Pressurizer Pressure-Low Safety lnjec. 0.25 0.625 0.5 0.5 Dtfferenttal Pressure Between Two Stea*ltnes - Htgh . 0.25 0.625 0.5 0.5

~ .....

... __ ....,. - .. ---~ .... ---.--~-*~-*......,.** *~ ............ ._

TABLE 3-4 (Cont'd)

!! Jl.. 17 n 13 J!

1 J!

,.,. ll.

llcl tll1tl!l!I ElectrantCI te,c (llCSA) tallplraW' Settt111 cm>

y_.,.,.t.n U!

,.,, 11!

0rtfi SafetJ AMlJSts Lt*it 12)

STS All-blt Value l3)

STS Trtp Set(!!!1 nt l 3)

Total Allowance ll) ce.-1 Statistical Allowance U) "'!!'" Ul 1~

1::0 10

~SI Ill Effects 1091 RTP 7.5 4.9 +2.& 1~

o.s 1.0 1181 RTP 110I RTP 4.9 +3.4 1::0 0.25 261 RTP 251 RTP 8.3 0.25 0.5 1.0 351 RTP 1.8 1-(5) 5.51 RTP 5.0I RTP 11"'1 0.25 0.5 1.0 5.51 RTP 5.0I RTP 1.8 1-t 0.25 0.25 0.25 0.25 0.5 0.5 0.5 1.0 4.2 3.0 1.0 lil 30S RTP 5 1.3 x 10 cps function (7) 251 RTP 1.0 x 105 cps function (7) 7.0 9.8 10.7 4.3 +2.7 I>

1::0 I-<

] 0.5 function (6) 0.25 )1.0 I 0.25

}o.5 1.0 (5) function (7) function (7) 4.1 l 0.25 1.0 1865 psig 2.5 2.1 0.4 t 0.5 1.0 1845 psig 1855 psig 2.1 +1.0 0.25 2395 psig 2385 psig 3.1 1.0 2410 psig 3.2

"-li 0.25

.0.25 0.25 0.5 0.5 0.5 1.0 0.8 (5) 871 desifn 931 span 891 design 921 span 90I design 18% span 2.S 18.0

. 2.4 16.2

+o.1

+1.8 01 span 16) 171 span I 0.25 0.5 1.0

.I I

0.25 0.25 Jo.s 0.5 0.6 0.5 1.0 (S) 201 span 42.SI steamflow 241 span 40I steamflow 251 span 5.0 5.0 14.3 3.Z 0

1.

5 I 0.25 6M bus volt. (13) 651 bus volt. 701 bus volt. 1.3 0

[z:i 56.4 Hz 56. 5 Hz 1.3 ~

53.9 Hz (16) 45 ps1g r..:

t,,c gJ 45 psig 151 open 4.5 ps1g 151 open 4.0 psig 6.5 ~.r]

t,,c

  • ~7 o.25 0.9 7.9 psig 1765 pstg 3.8 2.1

"' 0.25 0.51 0.5 1.0 1735 pstg 1755 psig o.zs 0.5 100 pst 2.3

.,,. o.s (S) 112 psi

.......... * .,, -* .. - * * * * -******* *r' TABLE 3-4 (Cont'd) 1  !

ensor

!*. l.

(RCA)

(PEA) (STE)

(EA)

(PM) (SCA) (SPE) (SD) Emt.,,.....t.11 ta11bnt1*'

Process PriNl'J Pressure Tempera tan Allowance (1) . Acc.mg_ll}

Elenent Calibration Effects l ll Drtf.!l!l Measure11ent Accuracx l ll Effects l ll I Protectton Channel Accuracx l 1) Accuracx { 1}

0.25 -- 0.625 0.625 0.5 0.5

-- o.s 0.5 I

I 0.25 }-10.0 Stetm Flow 1n Two Ste*Hnes - High ( 11) ] 0.625 0.629 0.5 o.s r

. J3.0 1.22 1.0 --

0.25 0.2 ---- --0.625 0.5 ---- o.s o.s ll'T'll l-4 T

  • low-LOW 0.25 1.0 sUl.ltne Pressure - low tonu119ent Pressure - High-H1gh --

0.5 0.5

--0.5 0.5 0.5 1.0 -- o.s I>

I~

Ste* Generator Water level - High-High 2.0 I-<~

I, i

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I

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I'

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l l

I LI I l . ,.

I l

-* ,* .. ~** . ..

TABLE 3-4 (Cont'd)

  • -: *f' r* ~

1 l!! 1l Jl 13 l! n. !l 17 bet llMltM Electrontct

  • a,c l (ll:SA)

COllPINtel' Setttng Accurlq ( 1)

(RTE) lt!llPR"I bn Effects <*>

0rtft en Safety An1l1sts L1*tt (Z)

STS Allowable Value (3)

STS Trtp Setpotnt (3)

Total A11 owance ( U Channel Stat1sttCl1 Allowance (1) "'rwtn (1) te,c j

o.zs J (1) 0.5 ',.,,° 10 l! o.zs J 0.6 j~

I li 0.25 o.zs o.zs 0.5 0.5 0.5 0.6 z.o 1.3 (5)

(5)

~ps1g function (12) 541°F 480 pstg function (12) 543°F 500 pstg 8.3 12.5 3.7 2.3 .ffi.O

'° 1-0.25 0.5 0.9 26.7 pstg 24 pstg 23.5 pstg 5.3 2.3 +3.0 l-4

~

', I'

' o.zs 0.5 1.0 751 span 681 span 671 span 8.0 3.2 +4.8 I>

i i

I

'° I-<

i i ;

I I i I*

J I

I

.. *** ..... *-* ....... --- -~--**-***** .....

.... ~

. .. .... . . . ~ ..

TABLE 3*4A fJ.aMNE~ REVISION TO TABLE 3-4 Ii- '

l a,c.

~

. !. l.

(RCA) 1 (PM) (PE") ( c:; :-) (STE) (EA)

Process Prtmary (SC") Temperature (SD) Envtro.-ental Ca1tbnt1onl.,,

Element Caltbratton Pressure "ccur1~ l lJ:;a Measurement Accuraci l 1) Accuraci PJ Effects l 1) Effects Pl Drtft l1) "llowence lll Protection Chlnnel "ccuraci {1) 10 0.625 0.5 0.5 2.0 0.25 0.625 1-0 Pressurizer W1ter Level - Htgh 0.5 1:::0 0.625 0.625 0.5 +13.0 2.0 0.25 1-Stea &ener1tor W1ter leftl - Low-low 0.5 0.25 0.625 0.625 0.5 11"11 Stelll Generator W1ter Level - low 2.0 0.625 0.5 o.s 1-f 0.25 ll>

Conta1.-nt Pressure - H1gh o.s 0.25 0.625 o.s 1:::0 Conta1,.nt Pressure - H1gh-H1gh o.s I-<

0.625 0.5 Steal! Gener1tor Weter Level - H1gh-H1g 2.0 0.25 0.625 I

' i I

l***- -* -**-*** *-*** - - - - - - - - - - - - - - -

j

. .... _. -*- *.. ...., . -.. *-***- ., * ....---.**--* -=-*--*. ... . ..

......... ** * ** .. *

  • o I. *"" ... \*. . *' *~

TABLE 3-4A (Cont'd) 12 13 14 15 16 17

! 10 .l!

llct .._._. E11Ctl"'OlltCS ta,c ~ t1,c (ll:SA) Channel 1-0 I <m>

CClllPINtln" Safety STS STS (RD) Analysts Allowable Trtp Total Stat1st1ca1 1::0 Setttng T.,enblN Allowance (1) Allowance (1) Margtn (1)

Accunc1 lll Effects (1) Drtft (1) l1m1t (2) Value (3) Setpotnt (3) 10 0.25 o.s 1.0 (5) 931 span 921 spin 2.9 1-0

+2.1 1::0 0.5 1.0 OI span 171 span 181 span 18.0 15.9 0.25 1-1I 0.25 o.s 1.0 20I span 241 span 251 span 5.0 2.9 +2.l ll'T1 1-t

+4.5 II 0.25 0.5 0.9 7.9 pstg 4.5 pstg 4.e ps1g

  • 23.5 pstg 6.5 5.3 2.0 2.0 +3.3 I>

1::0 I 0.25 o.s 0.9 26.7 pstg 24 pstg I-<

o.s 681 span 671 span e.o 2.9 +5.l l1 0.25 1.0 751 span 4I

  • ~

l*

N

°'

- --I

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