ML18139A607

Responds to IE Bulletin 80-16, Potential Misapplication of Rosemount Inc Models 1151 & 1152 Pressure Transmitters W/Either a or D Output Codes. No Corrective Action Necessary for Model 1152 at Facilities

ML18139A607
Person / Time
Site:	Surry, North Anna
Issue date:	07/30/1980
From:	Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
599, IEB-80-16, NUDOCS 8008010266
Download: ML18139A607 (13)

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e Attachment Page 1 NOBTH ANNA POWER STATION UNIT NOS. 1 AND 2 RESPONSE TO IE BULLETIN NO. 80-16 "Potential Misapplication of Rosemount, Inc. Model 1151 and 1152 Pressure Transmitters with either "A" or "D" output codes".

(1) The Rosemount Inc. Transmitter Model Number 1152 is presently installed at the North Anna Power Station Units 1 and 2 in various applications.

No model number 1151 transmitters are utilized.

There are (2) model number 1152 transmitters with the following (5) process applications:

Narrow Range Steam Generator Level (9) Transmitters Main Steam Line Steam Flow (6) Transmitters Reactor Coolant Wide Range Pressure (1) Transmitter Casing Cooling Tank Level - Unit 1 Only (2) Transmitters Emergency Condensate Storage Tank (2) Transmitters Level - Unit 2 Only An attached table identifies pertinent information on these transmitter applications.

(2) Each transmitter application was reviewed* for input process conditions that could result in anomalous output signals. The determination is as follows:

Narrow Range Steam Generator Level The maximum input differential pressure condition possible for this transmitter is 144 inches of H o, which could occur if the water level in 2

the steam generator falls below the lower level tap. The minimum input differential pressure condition possible is O inches of water which could occur if the water level in the steam generator rises above the upper level tap. The input process conditions cannot exceed these extremes because the level sensing taps are fixed to the steam generator and thereby limit the measurement range of differential pressure by the transmitter.

Steam generator level transmitters are reverse acting with a maximum differential pressure producing a minimum transmitter level output. From Enclosure 1 of the Bulletin, the input differential pressure to produce an anomalous output from an overpressure condition is (150" H 0 x 1. 4 =

2 210" H 0). Reverse pressure conditions are not considered possible for 2

this application since the transmitter reference water column is fixed to the upper level tap.

Since the transmitter input is limited by the tap connections to 144 inches of water, it cannot exceed the 210 inches of water limit and no anomalous output should result.

Attachment Page 2 Main Steam Line Steam Flow For normal operating conditions, steam flow remains within the range of the transmitter; however, it is conceivable that the steam flow would be very high during the initial phase of a steam break accident as analyzed in Section 15. 4. 2 of the FSAR. A review of this section reveals from Figure 15.4.2-2 that a maximum steam flow from the affected steam generator of 3095 lbs/sec could exist for: a very brief period of. time following a complete main steam line rupture (3095 lbs/sec .x 3600 sec/hour= 11,142,000 lbs/hr.).

Using the methodology of the Bulletin, the limiting overpressure condition for the transmitter is (2770" H O x 1.4 = 3878" H 0), which could result in an erroneous indication at full scale. Normal full scale output of the steam flow transmitter is 1687 .4" H 0, which equals a 6

5 x 10 lbs/hour. Since steam pressure conditions at2 the flow measuring nozzle are not precisely known during the hypothesized steam line break, it is assumed, for purposes of analysis, that the differential pressure generated across the nozzle will exceed the overpressure limit of 3878 inches of water.

Although the steam flow transmitter may exhibit anomalous output during the initial phase of a major steam line break, no design basis assump-tions are violated. During the accident transient, the reactor is protected and safety injection is actuated by steam flow differential l:- ..

pressure which accurately sensed at a differential pressure equivalent to less than ll0% power (1256.7 11 H 0). Consequently, the protective fea-tures of the steam flow transmitter 2 function. properly before the process exceeds the transmitter overpressure limit of 3878 inches of water.

A transmitter reverse pressure condition is not considered possible for normal steam flow, since the transmitter taps are fix=d in relation to the flow measuring nozzle. However, a steam line break upstream of the flow measuring nozzle may cause the process flow to reverse. In this case the transmitters on the broken line are inoperable and the remaining transmitters on the unbroken line provide high steam flow protection.

The transmitters are not subject to anomalous output described in the Bulletin during normal and transient operations. During a brief period following a major steam break, the transmitter may exhibit anomalous output; however, the protective features function properly prior to reaching the transmitters full scale. Additionally no incorrect operator action occurs since the steam flow reduces rapidly on scale following a major steam break.

Wide Range Reactor Coolant Pressure Since the reactor coolant pressure is limited by code safety valves to less than 2485 psig, the reactor coolant pressure transmitters do not exceed the pressure conditions necessary to produce anomalous output.

• *~ '.. 'IJ' Attachment Page 3 Using the methodology of the Bulletin, the limiting overpressure condition of the transmitter is (3000 psig x 1.4 = 4200 psig). In addi-tion, reverse pressure conditions are not applicable.

Casing Cooling Tank Level Since the casing cooling tank is vented to atmosphere and limited by its height to 35 feet, 6 inches, the pressure exerted on the level trans-mitter can not exceed 426 inches of water (35 feet x 12 in/ft = 420 in.,

420 in.+ 6 in.= 426 inches of water).

Using the methodology of the Bulletin, the limiting overpressure condition of the transmitter is (750 in. of water x 1.4 = 1051 inches of water). This amount is greater than the maximum achievable pressure of the process; therefore no anomalous output will be produced. Additional-ly, reverse pressure conditions are not applicable to the transmitter since it is vented to atmosphere.

Emergency Condensate Storage Tank (110,000 Gallons)

Since the emergency condensate storage tank is vented to atmosphere and limited by its height of 32 feet 9 inches, the pressure exerted on the level transmitter cannot exceed 363 inches of water (32 ft. x 12 in/ft =

354 in., 354 in.+ 9 in.= 363 inches of water). - *

• Using the methodology of the Bulletin, the limiting overpressure condition of the transmitter is (750 inches of water x 1. 4 = 1051 inches of water), which is greater than the maximum achievable pressure of the process; therefore no anomalous output will be produced. ,Additionally, reverse pressure conditions are not applicable to the trasmitter since it*

is vented to atmosphere.

(3) Corrective Action For the five applications of Model 1152 Transmitters utilized at North Anna, no design basis assumptions are violated. Based on the*

analysis and evaluation performed, no corrective actions are required.

Attachment Page 4 VALUES OF PROCESS RANGE OF PROCESS VARIABLE WHICH VARIABLE MEASURED FOR COULD.PRODUCE COMPLETED MODEL TRANS RANGE TRANS RANGE NORMAL ACCIDENT ANOMALOUS SERVICE/

APPLICATION NUMBER LIMITS SETTINGS CONDITIONS CONDITIONS INDICATIONS FUNCTION N.R.

Stm. Gen.

Level 1152DP4A 0 to 150" H o 2

0% to 100%

Level 140.1 to 36.3 H 0 2

33 to 44%

Level 0 to 100%*

Level

. 210" H20 Level fil>/Stm. Gen.

6 Stm. 1152DP6A 0 to 2770 11 0 to 1687.4" 0 to 4xl0 6 0 to llxlO Flow H0 H 0 Lb/Hr Lb/Hr . 3878" H 0 &/Steam 2 2 2 Flow RC Wide Range 1152GP9A 0 to 3000 0 to 2335 0 to 2335 0-2485 4200 Pressure/

Press. Psig Psig Psig Psig Psig RC Press.

Casing Cooling 1152LL5A240 0 to 750" 0 to 365.25 11 0 to 365.25 11 0 to 365.25" >1051" H O Pressure/

H 6 2

Tank H 0 2

H 0 2 H 0 2 2 Liq. Le. .

Level'i'~

Emergency Condensate 1152DPSAPB 0 to 750" 0 to 289.50" 0 to 289.50" 0 to 289.5" >1051" H 0 Pressure/

Storage H0 H o H 0 H0 2 Liq. Level Tank-1,,\- 2 2 2 2

• Unit 1 Only

~\-*Unit 2 Only

Attachment 2 Page 1 SURRY POWER STATION RESPONSE TO IE BULLETIN 80-16 POTENTIAL MISAPPLICATION OF ROSEMOUNT, INC.

MODELS 1151 AND 1152 PRESSURE TRANSMITTERS WITH EITHER "A" OR "D" OUTPUT CODES

1. _Determine i~ your facility has installed or plans to install Rosemount, Inc. Model 1151 or 1152 pressure transmitters with output codes "A" or "D" in any safety-related application.

RESPONSE

It has been determined that there are Model 1152 pressure transmi.tters installed at Surry Power Station.

2. If it is determined that your facility has the transmitters described in 1 above in any safety-related application, determine whether they can be exposed to input pressures that could result in anomalous output signals during normal operation, anticipated transients or design bases acci-dents. If the affected transmitters can be exposed to input pressures that could result in anomalous output signals, perform a worst case analysis to determine whether the anomalous signals could result in vio-lating any design bases assumption. The safety-related application shall include control, protective or indication functions. If any safety-rela-ted application does not conform to the above requirements address the basis for continued plant operation until the problem is resolved and provide an analysis of all potential adverse system effects which could occur as a result of a postulated pressure transmitter* ma:Loperation decribed in Enclosure 1 of this bulletin. In each instance, the analysis should include the effects of postulated transmitter maloperation as it relates to indication, control and protective functions. The analysis shall address both incorrect automatic system operation and incorrect operator actions caused by erroneous indications. Address the confor-mance to : IEEE 279, Section 4. 20 in your analysis. Include in your analysis the following table:

a. Complete model number.

b. Transmitter range limits.

c. Transmitter range setting.

d. Range of process variable measured for (1) normal and (2) accident conditions.

e. Values of process variable which could produce anomalous indication based upon your evaluation.

f. Service/function.

RESPONSE

The attached data sheets provide the information requested in Item 2 above.

Attachment 2 Page 2

3. Submit a complete description of all corrective actions required as a result of your analysis and evaluations, together with the schedule for accomplishing the corrective actions.

RESPONSE

No corrective actions are planned at this time. An ongoing analysis is being conducted concerning the range of process variable measured for accident conditions. Should the results of this analysis yield any information contrary to our findings it will be forwarded as a supple-ment to this submittal.

Surr~wer Station Response to IE Bulletin 80-16 A. Model No: 1152 DP5A92PB . Serial No.236678 B. Range Limits: 0-750" H20

c. Range Settings: 0-400" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-400" H 0 = 4-20 ma OUT Accident Conditions: 400" 2 E. Values of Process Variable which could Produce Anomalous Indication: 1050" H o 2

F; Service/Function: Aux. Feed Pump Discharge flow to 2C S/G.

A. Model No. 1152 DP4A92PB Serial No . . 52215 B. Range Limits: 0-150" HO 2

C. Range Settings: 0-25" HO 2

D. Range of Process Variable Measured for Normal Conditions: 0-25" H 0 = 4-20 ma OUT.

Accident Conditions: 14" 2 E. Values of Process Variable which could Produce Anomalous Indication: 210" H 0 2

F. Service/Function: TK A accumulator level.

A. Model No: 1152 DP4A92PB Serial No. 52543 B. Range Limits: 0-150" HO 2

c. Range Settings: 0-25" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-25" H 0 = 4-20 ma OUT.

Accident Conditions: 14" 2

• E. Values of Process Variable which could Produce Anomalous Indication: 210" H20 F. Service/Function: TK A accumulator level

~-y Power Station Rli!ponse to IE Bulletin 80-16 A. Model No: 1152 DP4A92PB Serial No. 69970 B. Range Limits: 0-150 11 H20 C. Range Settings: 0-25 11 H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-25" H 0 = 4-20 ma OUT.

2 Accident Conditions: 14" E. Values of Process Variable which could Produce Anomalous Indication: 210" H 0 2

F. Service/Function: TK B accumulator level A. ~1odel No. 1152 DP4A92PB Serial No. 52214 B. Range Limits: 0-150" HO 2

C. Range Settings: 0-25" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-25 11 H o = 4-20 ma OUT.

Accident Conditions: 14" 2 E. Valu~s of Process Variable which could Produce Anomalous Indication: 210 11 H 0 2

F .. Service/Function: Accumulator TK B level A. Model No: 1152 DP4A92PB Serial No. 51984 B. Range Limits: 0-150" H 0 2

C. Range Settings: 0-25" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-25" H o = 4-20 ma OUT.

Accident Conditions: 14" 2 E. Values of Process Variable which could Produce Anomalous Indication: 210 11 H 0 2

F. Service/Function: Accumulator TK C level

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

Surr~ower Station Response to IE Bulletin 80-16 A. Model No: 1152 DP4A92PB Serial No. 115723 B. Range.Limits: 150" HO 2

C. Range Settings:

D. Range of Process Variable Measured for Normal Conditions: 12-37" Hi = 4-20 ma *our.*

Accident Conditions: 14 11 E. Values of Process Variable which could Produce Anomalous Indication: 210" H o 2

F. Service/Function: Accumulator TK A Level A. Model No. 1152 DP4A92PB Serial No. 52216 B. Range Limits: 0-150" H 0 2

C. Range Settings: 12-37" HO 2

D. Range of Process Variable Measured for Normal Conditions: 12-37" H o = 4-20 ma OUT.

f* Accident Conditions: 14" 2 E. Values of Process Variable which could Produce Anomalous Indication: 210' H o 2

F. Service/Function:. Accumulator TK A Level A. Model No: 1152 DP4A92PB Serial No. 51982 B. Range Limits: 0-150" H 0 2

C. Range Settings: 12-37" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 12-37" H o = 4-20 ma OUT.

Accident Conditions: 14" 2 E. Values of Process Variable which could Produce Anomalous Indication: 210" H o 2

F. Service/Function: Accumulator TK B Level

S ~ Power Station R~onse to IE Bulletin 80-16 A. Model No: 1152 DP4A92PB Serial No. 52218 B. Range Limits: 0-150" HO 2

C. Range Settings: 12-37'" H b 2

D. Range of Process Variable Measured for Normal Conditions: 1.2-37" H 0 = .4-20 ma OUT.

2 Accident Cond.itions: 14" E. Values of Process Variable which could Produce Anomalous Indication: 210" H 0 2

F. Service/Function: Accumulator TK B Level A. Model No. 1152 DP4A92PB Serial No. 52541 B. Range Limits: 0-150" H 0 2

C. Range Settings: 12-37" HO 2

D. Range of Process Variable Measured for Normal Conditions: 12-37" H o = 4-20 ma OUT.

2 Accident Conditions: 14" E. Values of Process Variable which could Produce Anomalous Indication: 210 H o 2

F. Service/Function: Accumulator TK C Level A. Model No: 1152 DP4A92PB Serial No. 52542 B. Range Limits: 0-150" HO 2

C. Range Settings: 12-37" HO 2

D. Range of Process Variable Measured for Normal Conditions: 12-37" H 0 4-20 ma OUT.

2 Accident Conditions: 14" E. Values of Process Variable which could Produce Anomalous Indication: 210 11 H20 F. Service/Function: Accumulator TK C Level

Surr~wer Station Response to IE Bulletin 80-16 A. Model No: 1152 DP4A92PB Serial No. 89296 B. Range Limits: 0-150" H 0 2

C. Range Settings: 0-48" HO 2

D. Range of Process Variable Measured for Normal Conditions: 0-48" = 4-20 ma OUT.

Accident Conditions: 48" E. Values of Process Variable which could Produce Anomalous Indication: 210" H 0 2

F. Service/Function: Primary Drain Transfer TK Level A. Model No. 1152 DP4A92PB Serial No. 115725 B. Range Limits: 0-150" H 0 2

C. Range Settings: 0-100" HO 2

D. Range of Process Variable Measured for Normal Conditions: 0-100" H o = 4-20 ma OUT.

' Accident Conditions: 100" 2 E. Values of Process Variable which could Produce Anomalous Indication: 210" H o 2

F. Service/Function: . Reactor Coolant Pump Thermal Barrier HX OUT Flow A. Model No: 1152 DP4A92PB Serial No.52217 B. Range Limits: 0-150"

. H20 C. Range Settings: 0-25" H 0 2

D. Range of Process Variable Measured for Normal Conditions: 0-25" H o = 4-20 ma OUT.

2 Accident Conditions: 14" E. Values of Process Variable which could Produce Anomalous Indication: 210" H 0 2

F. Service/Function: Accumulator TK C Level

e S~y Power Station Re~ponse to IE Bulletin 80-16 A. Model No: 1152 DP4A22DP Serial No. 48968 B. Range Limits: 0-150 11 HO 2

C. Range Settings: 0-48 11 HO 2

D. Range of Process Variable Measured for Normal Conditions: 0-48" H 0 = 4-20 ma OUT.

Accident Conditions: 48 11 2 E. Values of Process Variable which could Produce Anomalous Indication: 210" H o 2

F. Service/Function: Primary Drains Transfer TK Level

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