ML19340E493
| ML19340E493 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/18/1980 |
| From: | Conway W VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-17, WVY-80-171, NUDOCS 8101140707 | |
| Download: ML19340E493 (4) | |
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'1, VERMONT YAN KEE NUCLEAR POWER CORPOhA'bIbN
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.a SEVENTY SEVEN GROVE STREET M
hi6hl RuTLAxo, VennoxT osvoi REPLY TO: )
ENGINEERING OFFICE TURNPIKE RO AD WESTBORO. M ASSACHUSETTs 01581 T ELEPHON E S 8 7-364-9 01 I December 18, 1980 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 Attention:
Mr. Boyce H. Grier, Director
References:
a) License No. DPR-28 (Docket No. 50-271) b) USNRC Letter to VYNPC, dated July 18, 1980; IE Bulletin 80-17, Supplement 1 c) VYNPC Letter (WVY 80-116) to USNRC, dated August 15, 1980 d) VYNPC Letter (WVY 80-133) to USNRC, dated September 19, 1980
Dear Sir:
Subject:
Supplemental Response to IE Bulletin 80-17, Supplement 1 In reference (d), we provide a written description of our proposed
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i design for SDV level monitoring. This response is being provided as a result of a verbal request from the site resident inspector for more i
detailed information concerning our installed level monitoring system.
In response to this request, the following is provided:
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The level monitoring system installed consists of two (2) inde-l pendent level monitoring systems manufactured by Drexelbrook Engineering l
Company. Each system monitors one of the scram discharge volumes (see Figure 2).
The systems use capacitance probes for level detection.
One probe is mounted in each scram discharge header at the lower point of the common header (see Figure 1).
This probe provides an output signal to a Drexelbrook transmitter which varies proportionally with the level in the SDV. The transmitter in turn provides 1) local indi-cation, 2) remote indication on Control Room Panel 9-5, and 3) an out-put signal to the SETCON controller which gives an alarm on Control Room Panel 9-5.
It is anticipated that the alarm will be set at 10%
which will correspond to approximately 0.6 inches.
i tihe 114 o'tcrt a
VERMONT YANKEE NUCLEAR POWER CORPORATION U. S. Nuclear Regulatory Commission December 18, 1980 Page 2 The system was installed during the current refueling outage.
Af ter installation, the SDV was backfilled through the SIV and an ultrasonic sensor was used to measure the level in the SDV and verify proper operation of the system.
We trust that this supplemental information is satisfactory; however, should you desire additional information, please contact us.
I i
Very truly yours, Willia,m F. C4^pway Vice President and Manager of Operations i
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