L-88-017, Change in Method of Reactor Coolant System Level Detection
| ML072540441 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/11/2007 |
| From: | Spina J Calvert Cliffs, Constellation Energy Group, Constellation Generation Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-88-017, TAC 69730, TAC 69731 | |
| Download: ML072540441 (2) | |
Text
James A. Spina Vice President Constellation Energy.
Generation Group U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
REFERENCES:
Calvert Cliffs Nuclear Power Plant, Inc.
1650 Calvert Cliffs Parkway Lusby, Maryland 20657 41 0.495.5200 41 0.495.3500 Fax September 1 1,2007 Calvert Cliffs Nuclear Power Plant Unit Nos. 1 & 2; Docket Nos. 50-3 17 & 50-3 18 Change in Method of Reactor Coolant System Level Detection (a)
Letter from Mr. G. C. Creel (BGE) to Document Control Desk (NRC),
dated June 1 1, 1991, Generic Letter 88-1 7, "Loss of Decay Heat Removal" (TAC Nos. 69730 and 6973 1)
(b)
Letter from Mr. C. H. Cruse (BGE) to Document Control Desk (NRC),
dated December 4, 1997, Change in Method of Reactor Coolant System Level Detection I
In Reference (a) we described our compliance with the Reactor Coolant System (RCS) level monitoring requirements of Generic Letter 88-17. In that letter we committed to providing two methods of monitoring RCS level that met the requirements of the Generic Letter. Those methods are a wide-range level detector and a narrow-range ultrasonic transmitter. The instruments described in Reference (a) were installed as required.
In reference (b) we informed the Nuclear Regulatory Commission (NRC) staff of the addition of a third method of monitoring the RCS level during periods of reduced RCS inventory. That additional instrument is the refueling level indicator. The letter described the instrument and stated that it had been verified to meet all of the applicable requirements of Generic Letter 88-17 for level instrumentation.
During a recent review of RCS level indication, it was determined that the refueling level indicator does not meet all of the requirements of Generic Letter 88-17 for level instrumentation. Therefore, we are informing the NRC staff that we are withdrawing this instrument from the group of approved instruments used to monitor RCS water level during periods of reduced RCS inventory.
We retain the initial two required level instruments as acceptable measuring devices in accordance with Generic Letter 88-17. Issues with the ultrasonic transmitter that were described in Reference (b) will be resolved prior to the next use of the instrument in a reduced inventory condition. Therefore, we continue to meet the Generic Letter 88-17 requirements for level instrumentation required when we are in a (I
reduced RCS inventory condition.
Document Control Desk September 1 1,2007 Page 2 Should you have questions regarding this matter, please contact Mr. Jay S. Gaines at (410) 495-5219.
Very truly yours, cc:
D. V. Pickett, NRC S. J. Collins, NRC
/~esident Inspector, NRC R. I. McLean, DNR