ML20211D119
| ML20211D119 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/14/1986 |
| From: | Allen C COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 2240K, NUDOCS 8610220110 | |
| Download: ML20211D119 (4) | |
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- (h Commonwealth Edison 72 West Adams Street, Chicago, Ilhnois
" f Kddress Reply to: Post'OAce B6776T b/ Chicago, Ilknois 60690 0767 October 14, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
LeSalle County Station Units 1 and 2 SOR, Inc. Long Term Test Data NRC Docket Nos. 50-373 and 50-374 References (a):
M. S. Turbak letter to H. R. Denton dated July 23, 1986.
(b):
C. M. Allen letter to H. R. Denton dated August 20, 1986.
(c):
C. M. Allen letter to H. R. Denton dated September 10, 1986.
Dear Mr. Denton:
As a follow-up to the referenced letters, we have provided the next two sets of data from the subject test and have also attached a graph developed from this input. This data includes trip actuations performed at 8 weeks and 10.5 weeks from the beginning of the program.
In this test, switches of the Model 212 series (7 - 100" W.C. adjustable range) are being held at 1000 psig and are cycled at different intervals to monitor variances in trip actuations from their calibrated settings.
An observation which is evident from the graph is that once the initial 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of static pressure has been " soaked in", there is a large drop in rate of setpoint shift, which decreases further over time. The-latest data shows that the trend of switch trip points appears to have leveled off.
Finally, it appears that once a switch is pressurized, the trip point drift is not dependent on whether the switch is cycled often or left undisturbed for long periods and then cycled.
1 8610220110 861014 PDR ADOCK 05000373 f
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Mr. H. R. Denton October 14, 1986 This program is planned to continue for a total duration of eighteen months.
Further results will be reported to you as received from static "O" Ring Inc.
Please direct any questions you may have regarding the above matter to this office.
Very truly yours, A-C. M. Allen Nuclear Licensing Administrator 1m Attachments cc:
Dr. A. Bournia - NRR Region III Inspector - LSCS 2240K
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i ENCLOSURE SOR. Inc. Long Tern Time Test Data J
Model 103AS-B212 (7-100" W.C. Adjustable Range)
{
Switch "As-Found" Trip / Reset Values i
INITIAL
- CALIBRATION 24 HOURS 10 DAYS 2 WEEKS 3 WEEKS 4 WEEKS 8 WEEKS 10.5 WEEKS SWITCH #
7/8/86 7/9/86 7/18/86 7/23/86 7/29/86 8/6/86 9/4/86 2/22/86 Daily "A" 60.1/51.4 60.7/51.8 61.0/51.9 61.4/52.3 61.6/52.5 62.1/52.8 62.1/52.8 2 Week "A" 56.0/48.7 60.0/52.4 60.4/52.9 61.6/53.8 4 Week "A" 60.6/52.5 61.3/52.9 62.3/53.4 63.0/53.9 6 Week "A" 60.7/53.7 60.3/53.4 61.2/54.1 61.3/54.2 i
Initial Readings were taken at 1000 psig, at time T = 0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />, after having been cycled to obtain i
desired setpoint.
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