ML20054H635
| ML20054H635 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 06/15/1982 |
| From: | Garrity J Maine Yankee |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| MN-82-116, NUDOCS 8206240281 | |
| Download: ML20054H635 (2) | |
Text
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ENGINEERING OFFICE FRAMINGHAM. M ASSACHUSETTS 01701 617 872 8100 O
~ Chad June 15, 1982 MN-82-ll6 l
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l United States Nuclear Regulatory Commission I
Washington, D. C.
20555 Attention: Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch #3 Mr. Robert A. Clark, Chief
References:
(a) License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPC dated May 14, 1982
Subject:
Confirmation of Information Exchanged During Conversation on March 29,1982 We have reviewed the phone conversation report provided in your letter, Reference (b). As a result of our review, we are providing the following, revised answers (A), where applicable.
A1.
Agreed A2.
The transmitter uncertainty was incorrectly listed as 0.75%, the correct value is 0.25%.
Total uncertainties should be:
Recorder System (0.25%, 0.5%) = 0.56%
Indicator System (0.25%,1.0%) = 1.05%
A3.
Your answer states the correct time response information, as follows:
Transmitter 0.2 sec Indicator 2.0 see Recorder 1.0 see The indicator manufactor states in his product description that the response time is 2.0 seconds maximum. We understand this to mean 2.0 seconds to reach full scale 100%. This would give the equivalent time constant (63%) as 2.0/5 = 0.4 seconds.
It is our understanding that "for a step change, the output is defined as reading its final value after i
five time constants."
(Curtis D. Johnson, Process Control IOO/
Instrumentation Technology, John Wiley and Sons, 1977.
14 A4.
Ag reed 8206240281 820615 PDR ADDCK 05000309 P
4 0
I Mr. Pobert A. Clark, Chief 1
June 15, 1982 Page 2 AS.
A more accurate response would be as follows:
Maine Yankee hydrogen sample ports are located at two elevations. One at approximately 22 feet above sea level and the other at the top of the containment dome. Both hydrogen analyzers are connected to the same sample line which is connected to the sample header with dual sample i
ports.
A6.
Agreed A7.
The NRC presumes the Consip analyzer indicator is 1.0% accurate. The total system is 2.0% and Maine Yankee does not assume anything else.
Therefore:
Consip with Indicator = 2.0%
Consip with Recorder = RSS (2.0, 0.5) = 2.1%
Bendix with Recorder = RSS (1.0, 0.5) = 1.12%
A Bendix indicator does not exist, however the recorder serves as an indicator.
We trust this information is satisfactory; however, should your staff desire further information, please do not hesitate to contact us.
Very truly yours,
/4 4k / 4 John H. Garrity, Senior Director Nuclear Engineering and Licensing RHG/ tan
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