ML20053B018
| ML20053B018 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 05/17/1982 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM NUDOCS 8205270617 | |
| Download: ML20053B018 (7) | |
Text
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o I)C O-o Ko I!U 17 O2 Docket No. 50-298 O
g Mr. J. M. Pflant Director g
Licensing & Quality Assurance RECEIVED T
Nebraska Public Power District MAY 211982% _g P. O. Box 499 Columbus, Nebraska 68601
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Dear Mr. Pflant:
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Subject:
NUREG-Items II.F.1.4 II. F.1.5, And II.F.1.6 Re: Cooper Nuclear Station We are presently reviewing your submittal on TMI Action Plan Items II.F.1.4, " Containment Pressure Monitor," and II.F.1.5, " Containment Water Level Monitor," and II.F.1.6, " Containment Hydrogen Monitor."
On March 24 thru March 26, 1982 P. Kapo of the Containment Systems Branch and the NRR Project Manager, Byron Siegel, conducted a series of conference calls with Jeff Weaver of your staff to supplement the information you sutsnitted on TMI Action Plan Items II.F.1.4, II.F.1.5, and II.F.1.6.
Because our review will be, in part, based on the results of this telephone conversation, we want to document our understanding of this information so that we may complete our review and issue a safety evaluation to close out these items. Accordingly, please review the enclosed phone conversation record and confirm, in writing, by June 11, 1982, whether the information is correct. It if is not, please note any corrections.
If you have any questions, please call your Project Manager, Byron Siegel, at (301) 492-7534 Sincerely, original sig' icd by l
Domenic B. Vassallo, Chief Operating Reactors Branch #2 Division of Licensing
Enclosure:
Telephone Conversation Record g
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ogey OFFICIAL RECORD COPY uscro; mi-useo NRC FORM 318 (10-80) NRCM 0240
Mr. J..M. Pilant Nebraska Public Power District cc:
Mr. G. D. Watson, General Counsel Nebraska Public Power District P. O. Box 499 Columbus, Nebraska. 68601 Mr. Arthur C. Gehr Attorney Snell & Wilmer 3100 Valley Center Phoenix, Arizona 85073
. Cooper Nuclear Station ATTN: Mr. L. Lessor Station Superintendent P. O. Box 98 Brownville, Nebraska 68321 Auburn Public Library 118 - 15th Street Auburn, Nebraska 68305 Mr. Dennis Dubois USNRC Resident Inspector P.O. Box 218 Brownville, NE 68321 John T. Collins Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
RECORDOFPHONECONVERSATION(s) ll (Inclusive) DATE(s) 24 Mar 82 thru 26 Mar 82 UTILITY PLANT DOCKET NRC PROJECT MANAGER PHONE ROOM NPPD Cooper 50-298 Byron Siegel 27534 422 NUREG-0737 ITEMS mg C
II.F.1.4 CONTAINMENT PRESSURE MONITOR t;<
II.F.1.5 CONTAINMENT WATER LEVEL MONITOR mh II.F.1.6, CONTAINMENT HYDROGEN MONITOR UTILITY LICENSING CONTACT & PHONE
. Jeff Weaver 402-563-5659 PARTICIPANTS (Asterisk before name indicates originator of call) i
.iFFILIATION MAME PHONE 301-492-7534 Byron Siegel NRC 301-492-8298 Pcter Kapo 402-563-5659 NPP9 Jeff Weaver DISTRIBLTTION LIST Walt Butler ------------- P904 Mel Fi el d s -------------- P904 Jack Kudri ck ------------ P904 416 Helen Nicolaras Peter Kapo -------------- P1122 416 By ron Si egel ------------
CSS Reading File Wally Wade EG&G 2801,0ld Crow Canyon Road San Ramone, California 94583
PHONE CONVERSATION 24-26 MAR 82 COOPER Note: See Appendix for definitions and abbreviations.
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The review we are discussing is the Containment Systems Branch (CSB) part of the total review discussed in NUREG-0737.
The CSB review con-sists of all items discussed under " Position" and " Clarification" ex-cept the review of compliance to the Appendix B criteria, and the review of the measurement system completion datef.* In the submittals we received to date, you have not indicated that you plan to take exception to any of the NUREG-0737 criteria in our area of review.
Are you planning any ex-ceptions in our area of review of which we are not aware.
A1.
There is just one item which we don't regard as an exception,of any im=
portance.
NUREG-0737 requires that the hydrogen monitors have a range of 0% to 10%.
Cooper has one monitor with a range of 0% to 5% and the second monitor has a range of 0% to 20%.
Q2. What is the accuracy of your pressure monitor? State this for both the indicator and the recorder.
A2.
There is only one readout device - the recorder, which also serves as an indicator.
There are two pressure monitors, the low range which extends from -5 psig to +5 psig, and the high' range which extends from 0 psig to 250 psig.
Both systems have the same uncertainty.
0.25%.
Transmitter SD = 0.5%.
Recorder SD
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System SD = RSS (0.5%, 0.25%) = 0.56%.
Q3. What is the time response of your pressure monitor? State this for both the indicator and the recorder.
A3.
The transmitter goes from 1r% to 90% output in 180 milliseconds on a step function input.
Assume a first order transfer function exp(-t;/TTC) = 0.9 t /TTC = 2.302 exp(-t /TTC) = 0.1 t /TCC = 0.105 2
2 1
at = t -tj = 0.18 sec. = (2.302 - 0.105)* TTC Transmitter Time Constant =
2 TTC = 0.08 sec.
The Recorder goes from 10% to 90% in 3 sec., or 0% to 63% in 2.4 sec.
- The environmental qualification and request for schedular relief for II.F.1.4 II.F.1.5, and II.F.1.6 will be dealt with separately.
PHONE CONVERSATION 24-26 MAR 82 COOPER Q4. What is the accuracy of your water level monitor? State this for both the wide range instrument and the narrow range instrument.
A4.
We have separate water level monitors for the torus and the drywell.
On each systcm there is only one readout device, the recorder, which also serves as an indicator.
The uncertainties in these systems are es follows:
Drywell Transmitter 50 = 0.5%.
Recorder 50 = 0.25%
Torus Transmitter SD = 1.0% [ Range 0 ft. - 20 ft.]
Drywell System SD = RSS (0.5%, 0.25%) = 0.56%
Torus System SD = RSS (1-0%, 0.25%) = 1.03%
QS. Where are the hydrogen sample ports. placed?
AS.
There are three hydrogen sample ports on the drywell at elevations 13 feet, 43 feet, and 78 feet above the bottom of the drywell and two ports in the torus.
Q6.
Is there any obstruction which would prevent hydrogen, escapin'g from the core, from reaching the hydrogen sample ports quickly?
A6.
No.
Q7. What is the accuracy of your hydrogen monitor?
A7.
Both hydrogen monitors have only one readout device; the recorder, which also serves as an indicator.
The hydrogen monitors come as units with total uncertainty specified for the whole unit.
Beckman Monitor:
Range 0% - 20%, Accuracy 5%
Bendix Monitor:
Range 0% - 5%, Accuracy 2%
App:ndix e
QX1 where X is a number, indicates Question number X asked by the NRC.
A'X, where X is a number, indicates licensee's response to QX.
DX, where X is a number, indicates the conclusion of dialogue between, the NRC and licensee in question X.
RSS ( A, B, C) indicates the Root Sum Square of the numbers A, B and C.
SD means Standard Deviation of errors.
3*SD is, by convention, a practical uppcr limit of errors.
TC means Time Constant which for linear components is the time required for the component to achieve 63.2% of its final response after a step function is impressed on the input.
The only non-linear component in the measurement systems we are discussing is the strip chart recorder.
4*TC is, by convention, the time required for a component to achieve 100% of its final response after a step function is impressed on the input.
TC (HP-67) is the time constant exhibited by a string of linear components, as computed by an HP-67 pocket computer program developed by the NRC.
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When a component or system has the uncertainty indicated in %, this means % of full scale.
In almost all, cases, the licensee supplies a figure of uncertainty or time re-sponse for each component, but the parameter this figure represents is not gen-erally used.
Most likely all uncertainty figures represent either 2*SD or 3*SD and all time response figures represent either 1*TC or 4*TC.
We will at times be making judgments of what parameter is being quoted.
., There is a problem in finding an appropriate parameter to quote for the time responsa of the indicator output and the tine response of the strip chart re-corder output. The indicator output is a sum of exponentials.
The recorder output is a straight line while the input signal is ahead of the readout.
For large pressure transients this straight line output covers most of the total response.
Near the end of the pressure transient, the r? corder output has
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caught up with the input, which is e sum of exponentials, and the end of the recorder trace will be this sum of exponentials. We have adopted the TC as the measure of time response for linear systems, i.e., we use TC as the measure '
of time response for the systems which have readout and indicator. Quite arbi-trarily, we have also labeled the response time of a recorder system as the time it takes the recorder to sweep 63% of its total span after a step input is im-i pressed on the system.
For linear components the 63% TC is a physically meaning-ful quantity.
For the recorder 63% is just an arbitrary figure we are using to quantify its time response.
Whenever the phrase " time to reach 63% of final response," it is implied we are discussing the response to a step function change in the input, whether or.ot the step function change is explicitly stated.
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