ML20205F364
| ML20205F364 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/21/1987 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 5211-87-2066, NUDOCS 8703310147 | |
| Download: ML20205F364 (2) | |
Text
,
a GPU Nuclear Corporation 0 Nuclear
=e rmao o
s Middletown, Pennsylvania 17057-0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Nurnber:
March 21, 1987 5211-87-2066 U.S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, DC 20555 Gentlemen:
Three Mile Island Nuclear Station Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Conformance with Regulatory Guide 1.97 -
Condensate Water Storage Tank Level Indication GPU Nuclear Corporation (GPUN) letter 5211-86-2097 dated June 5,1986 (Reference 1) identified proposed modifications to TMI-l in accordance with the provisions of Regulatory Guide 1.97, and a schedule for each. All modifications were scheduled for completion by the end of the Cycle 7 Refueling Outage or earlier.
In Reference 1, GPUN committed to upgrade the Condensate Water Storage Tank Level Indication in accordance with the Regulatory Guide 1.97 requirements for Category 1 variables by Refueling Outage 6R, which is currently in progress.
GPUN has installed new sensors in the form of differential pressure sensors in the drainage line from the tank.
The sensors as currently installed are subject to oscillation which results in a more unstable level indication than the previous non-safety grade level indication. For this reason, GPUN intends to use the original level indication for Cycle 6, and provide improved level indication capability meeting the requirements of Regulatory Guide 1.97 by the end of the Cycle 7 refueling outage. As discussed with J. Thoma of your staff on March 16, 1987, this change in schedule is not inconsistent with the NRC Order dated June 14,1984 (Reference 2).
It should be noted that as a Condition of TMI-l Restart, Reference 3 imposed a requirement that prior to startup following Cycle 6 refueling, GPU Nuclear Corporation upgrade the Condensate Storage Tank low-low level alarm to safety grade. This modification has been completed. The input signal to the low low level alarm is from the new differential pressure sensors identified above.
M 3k BOD P
g GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
r 5211-87-2066 March 21, 1987 The safety function of the low low level alarm to provide the operator early warning of low condensate inventory is still assured.
GPUN is investigating the solution to the problems which have been experienced during the startup tests and will advise the NRC of our solution by June,1987.
Sincerely, H. D. Hukill Vice President & Director, TMI-l HDH/SK/pa:0832A cc:
T. E. Murley, USNRC R. Conte, USNRC
References:
(1 ) GPUN Letter 5211-86-2097 " Emergency Response Capability -
Conformance to Regulatory Guide 1.97", H. D. Hukill to J. F. Stolz, dated June 5,1986.
(2) HRC Letter, John F. Stolz to Henry D. Hukill dated June 14, 1984, transmitting " Order Confirming Licensee Commitments on Emergency Response Capability".
(3)
HRC Letter, " Restart of TMI-l (Facility Operating License No. DPR-50)", Harold R. Denton to Henry D. Hukill, dated October 2,1985.