ML20052H387
| ML20052H387 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 05/14/1982 |
| From: | Clark R Office of Nuclear Reactor Regulation |
| To: | Garrity J Maine Yankee |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM NUDOCS 8205200309 | |
| Download: ML20052H387 (7) | |
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MAy 3 4,gg2 Docket No. 50-309 DISTRIBUTION ACES ~10 HN1c Taras Docket File JHeltemes Gray File NRC PDR Mr. John H. Garrity, Senior Director PMKreutzer Nuclear Engineering and Licensing LPDR Maine Yankee Atomic Power Company CNelson q
83 Edison Drive ORB #3 Rdg Augusta, Maine 04336 OELD N
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Dear Mr. Garrity:
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SUBJECT:
NUREG-ITEMS II.F.1.4, II.F.1.5. AND II.F.1.6 s
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RE: MAINE YANKEE (s
We are presently reviewing your submittal on TMI Action Plan Items II.F.1.4, " Containment Pressure Monitor," and II.F.1.5, " Containment l
Sater Level Monitor," and II.F.1.6.." Containment Hydrogen Monitor."
l On March 29, 1982, P. Kapo of the Containment Systems Branch sodducted a conference call with members of your staff to supplers:nt the in-formation you submitted on TMI Action Plan Items II.F.1.4. II.F.1.5 l
and II.F.1.6.
Because our review will be, in part, based on the results of this telephone conversation, we want to documdnt our un-derstanding of this information so that we may complete our review and issue a safety evaluation to close out these items..Accordingiy, please review the enclosed phone conversation record and confirm.in writing, by June 11, 1982, whether the information is correct.
If it is not, please note any corrections.
If you have any questions, please call your Project Manager, Cheis Nelson, at 301 492-8140.
Sincerely.
Original signed by Robert A. Clark Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing l
Enclosure:
Telephone Conversation Record 8205200309 820514 cc: See next page PDR ADOCK 05000309 p
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NRC FORM 318 (10-80) NRCM 0240 OFFIClAL RECORD COPY usc. a mi_m.
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j.(Inclusive) DATE(s) 29 Mar'82
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RECORD OF PHONE CONVERSATION (s) i UTILITY PLANT DOCKET NRC PROJECT MANAGER PHONE ROCH l
MY Maine Yankee 50-309 Chris Nelson 28140 l
430A I
u, gg NUREG-0737 ITEMS O==
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II.F.1.4 CONTAINMENT PRESSURE MONITOR b$5 I I. 'F.1. 5 CONTAINMENT WATER LEVEL MONITOR BG v) E3 I I. F.1. 6 CONTAINMENT HYDROGEN MONITOR UTILITY LICENSING CONTACT & PHONE Bob Groce 617-872-8100 X2213 PARTICIPANTS (Asterisk before nare indicates originator of call)
AFFILIATION NAME PHONE I
Bob Groce 617-872-8100 X2213 MY l
Peter Yandow NRC Peter Kaoo 301-492-8298 i
CISTRIBUTION LIST Wal t B utl e r ------------- P904 Mel Fi el ds -------------- P904
- Jack Kudri ck ------------ P904 416 Helen Nicolaras Pete r Kapo ----------- --- Pil 22 Chris Nelson ------------ 428 CSB Reading File e
Wally Wade EG&G 2801,0ld Crew Canyon Road San Ramone,. California ~94583
29 MAR 82 MA N YANKEE PHONE CONVERSdTION NOTE - See Appendix for definitions and abbreviations.
Ql. 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 dates.** 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 anf ex-ceptions in our area of review of which we are not aware.
A1.
No.
Q2. What is the accuracy of your pressure monitor?
i A2.
Our pressure monitor consists of either a transmitter and indicator or a transmitter and recorder.
The specified component uncertainties, which most likely all represent 1*SD, are is follows:
Tra nsmitt er :
0.75%
Indicator:
1.0%
Recorden:
0.5%
This gives the following overall measurement system uncertainties:
RSS '(0.75%,1.0%) = 1.25%
i Indicator System SD
=
RSS (0.75%, 0.5%) = 0.9%
Recorder System SD
=
Q3.
What is the time response of your pressure monitor?
A& The transmitter has a specified response time of 0.E sec., which probably D3 represents 1*TC.
i The indicator has a specified response time of 2.0 sec, which probably represents 4*TC, or TC = 0.5 sec.
The recorder travels full scale in 1 second, which means it travels 63.2% of' scale in about 0.6 sec.
5 l
CThe environmental qualification and request for schedular relief for II.F.1.4, II.F..l.5, and II.F.1.6 will be dealt with separately.
l l
PHONE CONVERSATION "
29.. MAR 82 M INE YANKEE o
~
For the Indicator System, TC(HP-67) = 0.73 sec.
For the Recorder System, the time to reach 63.2% of final response would range from 0.2 sec to 0.6 sec, depending on whether the transmit-ter (small pressure transients) or the recorder (large pressure tran-sients) dominates the time response of the system.
Q4.
What is the accuracy of your water level monitor?
A4.
We have one single water level sensor for both containnent and sump.
The water level monitor system consists either of a transmitter and in-dicator or a transmitter and, recorder.
We have the following specifications for component uncertainties, all of 1
I which probably represent 1*SD.
Transmitter:
0.41 %
Indicator:
1.0%
Recorder:
0.5%
This gives the following overall system uncertainties:
f.SS (0.41 %, 1.0%) = 1.08%
Indicator System SD
=
RSS(0.41 %, 0.5%) = 0.65%
Recorder System.SD
=
QS.
Where are the hydrogen sample ports placed?
A 5.~ We have two. hydrogen analyzers which each connnect to a different hydro-gen sample port.within containment.
Both sample ports are placed so that hydrogen escaping from the core can reach them easily.
06.
Is there any obstruction which would prevent hydrogen, escaping from the core,from reaching the hydrogen sample ports quickly?
A6.
No.
Q7.
What is the accuracy of your hydrogen monitor system?
'A7.
We will assume tha't all uncertainties we quote are 1*SD.
s
EgGNE CONVERSATION
,. 29 MAR 82 MAfNE YANKEE
~
We have two hydrogen analyzer systems which are as follows:
A comsip analyzer which comes with its own indicator.
The spec.ified accuracy of the whole system is. 2.0%.
We suppos'e that the accuracy
_ of the indicator is 1.0%.
Then the analyzer without the indicator 2
2 should have an SD of 2%,)g, or SD = 1.73%.
Our Bendix analyser comes without any readout device and has a 'specified uncertainty of 1.0%.
We will have both indicator (SD = 1.9%) and recorder (SD = 0.5%) readout on both systems.
Comsip System with Indicator:
SD = 2.0%
i Comsip System with Recorder:
SD = RSS (1.73%, 0.5%) = 1.80%
Bendix System with Indicator:
= 1.41%
Bendix System with Recorder:
S D = RSS (1.0%, 0.5%)
= 1.12%.
5 G
G e
9
Appendix QX; where X is a number, indicates Question number X asked by the NRC.
AX, 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 Sym Square of the numbers A, B and C.
SD means Standard Deviation of errors.
1 3*SD is,, by convention, a practical upper limit of errors.
TC means Time Constant which for linear components is the time required for the componer.t 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 ccmponent to achieve 100% of its final response after a step function is impressed on the input.
g,
, TC (HP-67) is the time constant exhibited by a string of linear compot,3nts, as computed by an H,P-67 pocket computer program developed by the NRC.
l l
When a component or system has the uncertainty indicated in %, this means %'of full scal e.
In almost all cases, the licensee supplies a figure of uncertainty or time re-spcnse for each ccmponent, but the parameter this figure represents is not gen-erilly 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.
- - ~ - -
e s
- g There is a problem in finding an appropriate parameter to quote for the time responte.of the indicator output and the time response of the strip chart re-corder output.
The indicator output is a sum of expo.nentials.
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 res po ns e'.
Near the end of the pressure transient, the recorder output has caught up with the input, which is a 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 not the step function change is explicitly stated.
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