ML18139C242

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Forwards Response to NUREG-0737,Item II.F.1, Addl Accident Monitoring Instrumentation, Per .Info Details Accuracies & Time Responses of Containment post-accident Monitoring Equipment
ML18139C242
Person / Time
Site: Surry  Dominion icon.png
Issue date: 02/18/1983
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Harold Denton, Eisenhut D
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM 076, 76, NUDOCS 8302250265
Download: ML18139C242 (10)
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Text

e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 W. L. STEWART VICE PRESIDENT NUCLEAR 0PERATI.ONS Mr. Harold Denton, Director February 18, 1983 Office of Nuclear* R~actor Regulation Attn:

Mr. Darrel G. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Gentlemen:

Serial No:

076

  • PSE/RCC:lmf:-0303C Docket Nos.

50-280 50-281 License Nos.

DPR-32 DPR-37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 & 2 ADDITIONAL INFORMATION CONCERNING NUREG-0737, ITEMS II.F.1.4 CONTAINMENT PRESSURE MONITOR; II.F. 1.5 CONTAINMENT WATER LEVEL MONITOR; II.F.1.6 CONTAINMENT HYDROGEN MONITOR In response to your letter of January 11, 1983 requesting additional information concerning Items II.F. l.4, II.F. l.5 and II.F. l.6 of NUREG-0737, please find attached Vepco's submittal detailing the accuracies and time responses of our containment post-accident monitoring equipment, as well as the placement of our hydrogen monitor intake ports at Surry Power Station.

Should you require additional information, please contact us.

Attachments cc: Mr. James P. O'Reilly Regional Administrator Region II U.S. Nuclear Regulatory Commission Atlanta,.~eorgia. 30303 Mr. Steven A. Varga, Chief Operating Reactors Branch No.

Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555 8302250265 8302i8 PDR ADOCK 05000280 P

PDR Very truly yours, pH.~~l r W. L. Stewart

e ATTACHMENT

  • 1.

Exceptions being Taken to NUREG-0737 Requirements Q.l. **Irithe submitta*1s*-received to**date,you*have not*indicated that you plan~to take* exception to'any.of.the requirements of NUREG-0737.

  • Are:you planning any exceptions* of.which we are.not aware?

A.

Exceptions/clarifications* to**NLJREG~0737 were previously provided to the NRC by Vepco letters Serial No. 358 dated June 18, 1981, Serial No. 655 dated December 9, 1981 and Serial No. 367 dated June 28, 1982.

2.

II.F. 1.4 - Pressure Monitoring System (PMS) - Accuracy & Time Response Q.2A. Provide a diagram of the configuration of modules that make up your PMS.

A.

Drawings are attached providing the configuration of components that make up the PMS.

Q.28. What is the accuracy of your pressure monitor?

A.

Indicating Loop Transmitter(% of scale)

Indicator(% of scale)

Recording Loop Transmitter(% of scale)

Recorder(% of scale)

+ 0.25%

+ l. 5 %

+

.25%

+ 0.5 %

Equipment accuracies are consistent with accuracies of similar equipment throughout the industry.

Total Loop accuracy using the sum of the squares method.

Indicating Loop:

Recording Loop:

+ 1.6%

+

. 7%

Q.2D. What is the time response of your pressure monitor?

A.

. Indicating Loop Transmitter: 0.1 second for 0%-100% of span

  • .. **.Indicator:
  • *2.5 seconds for 0%-100% response Recording Loop Transmitter:

0.1 second for 0%-100% span Recorder:

1.o* second for 100% step change

The response of the indicating loop as a worst case is essentially equal to the sum of the response of the indicator and the

  • transmitter, the same logic holds true for the recording loop, in that the response. of the*recorde~ summed with the transmitter
response**ts
  • the* Tesponse of. the 1 oop...... *Ti me,.responses are *inherent
  • tq,equipment based on vendor.supplied information.

"*1he accuracy'of.the indicating*and recording loops is not effected by the power sup,ply at Surry as thts power.supply does not convert

  • or manipulate the loop signal as is the case at North Anna.

Q.4.

(II.F. 1.5) What is the accuracy of your water level monitor? State this for both the wide range and narrow range instruments.

See attached sheets, titled 11 II.F. 1. Attachment 5, Containment Water Leve 1 Monitor - Surry.

11 Q.5.

(II.F. l.6) Where are hydrogen sample ports placed?

Unit l & 2 -

The sample is taken from containment penetrations within the annulus area at elevation 10 1-9 11 The penetrations are utilized by the Hydrogen Analyzers and the Containment Vacuum System.

Q.6.

(II.F. l.6) Is there any obstruction which would prevent hydrogen from the core from reaching the hydrogen sample ports quickly?

Unit l & 2 -

The sample ports are in the area of the annulus containment which has a substantial amount of piping in close proximity.

However, this does not impede the hydrogen from reaching the sample ports since the

.'/

containment sprays provide the mechanism for diffusion i

and mixing of the containment atmosphere enabling a

.~i representative sample of containment atmosphere to be I

sampled by the Hydrogen analyzers.

Q.7.

(II.F. l.6) What is the accuracy of the hydrogen monitor?

The accuracy of the. hydrogen monitor is based on the following variables:

+ 1% Sample air due to flow

+/- 1% Analyzer Electronics <sample cell)

+/- 2% Calibration gases

+ 0.5% Transducer (4-20 MA)

0.5~ Recorder (customer supplied)

.+ 2% Comsip supplied indicator

    • +/-' 1.5% Mai.n board metel'7 (customer* supplied.remote indicator)

Total Indication Loop accuracy using square root of the sum of the squares method:

e (Result in% full scale)

% = + -J1 2 + 12 + 22 +.5 2 + 1.52

% = + 2.9 e

  • Total.recording:,loop 0 accuracy,using square.root.of the sum of the squares method:

(Result in% full scale)

% = +...J 12 + 12 + 22 +.52 +.52

% = + 2.5

.e II.F.1, ATTACHMENT 5,' CONTAINMENT WATER LEVEL MONITOR -

SURRY

,ti

.At _Surry, t);e narrow range indication is provided by redundant level trans-mitters which have a.22 inch* range.

The wide range. indication will* be

  • provided-by*. redundant* level transmitters with. a range of 9 ft. *above** the containment floor.* which *is equivalent to about 600,000 gallons *..
  • Indication fl'Om.. all.four.transmitters is continuously. displayed** in the control room.
  • 1.....,Upon successful.completion of testing item (1). will be satisfied.

Wide

- and narrow range transmitters *are in the process of being qualified to IEEE 323-1.974 and IEEE 344-1975.

The power supplies -for all four. trans-:-

mitters are to be fed by Class lE vital power.*_

2.

. 3.

4.
5.
  • -... : t
  • Wide range transmitters* can measure level which is equivalent* to about a 6.00, 000 gallon capacity.

Redundant narrow range transmitters are provided *

  • This item is not applicable to North Anna and Surry.

Inherent in the transmitter design. is that any ina*ccuracy in the trans-:

  • mitt er is limited to ! inch.
  • Wid~ * 'Range * *

. Tl'ansmitter. (% of scale):

  • +/-
  • 48%

.. I' System power supply:

+/-. 5% *.

  • : ' I- ;.Indicator (%*of scale):.

+/-1. 5%

1 * *

- Total* +/-2. 48%

.. *.::,Narrow Range.

~
1.
J
  • ;*.,_Transmitter (%' of scale):

1

  • System power supply:
: : *,, 1. **
  • Indicator (%. of scale):
  • Total:

+/-2. 3%.

+/-.5%

+/-1.5%

+/-4.3%

Equipment accuracies are consistent with accuracies* of similar equipment

  • throughout the.* industry. *

-~

,' 1

. Tota! loop accuracy using the sum of the squares method:

  • Wide Range:..

+/-1.65%

-**Narrow Range:, +/-2.79%*

Draft 2

  • NU REG 0660 dated January 23, 1980 stated that narrow and wide
  • .. range.. containment water level instruments shall. have a meas_uremen t
,. accuracy *of*+/-5.0%.* 'This-requirement *is met with present-instrumentation.,

,, I I,

The*: stat~d leakage sensiti~ty as stated in the S~rry: FS~R fa 5' gpm in
  • . less* than an hour. *Present* instrumentation* is adequate to_* detect this

_ leakag~ for containment sump level.

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