ML20236C716
| ML20236C716 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/14/1989 |
| From: | Fitzpatrick E GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-88-007, IEB-88-7, NUDOCS 8903220287 | |
| Download: ML20236C716 (3) | |
Text
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.s f
r GPU Nuclear Corporation L
Nuclear
- e s = 388 Forked River, New Jersey 08731-0388 609 971-4000 Writer's Direct Dial Number:
March 14,1989 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 j
Dear Sirs.
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 Response to NRCB 88-07, Supplement I j
09 June 15,1988, the USNRC issued Bulletin 88-07: Power Oscillations in Boiling Water Reactors. GPU Nuclear responded to the bulletin by letter dated September 14, 1988. The GPUN response stated that requisite training and evaluations had been completed, and that current procedures were adequate. However procedure revisions were being initiated to improve these procedures wherever appropriate.
On December 30, 1988, the USNRC issued Supplement I to NRCB 88-07. This letter is being written in response to that supplement.
The requisite information has been included as Attachnent I to this letter.
If you should have any further questions, please contact Mr. John Rogers of nty staff at (609) 971-4893.
j Very truly yours, i
eee af E. E. Fitz a rick
}
Vice President and Director 3
Oyster Creek o,
EEF/JR/aa q@
(0715A:01 )
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Att.
oo Sworn to and Sub ribed before me this/
day of PfajtM 1989.
oc) kt sta, & o Ac e A Notary Public of New Jersey coa.c DIANA M. DeBLASIO.
[6h NOTARY PUBUC OF NEW JE My Commis0an Expire 6 ~- -(
f i GPU Nuc' ear Corporation is a subsidrary of the General Pubhc Utikties Corporation
, I Mr. William T. Russell, Administrator Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. Alexander W. Dromerick, Project Manager U.S. Nuclear Regulatory Commission Division of Reactor Projects I/II Washington, DC 20555 l
NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731 1
ATTACHMENT 1 The GE interim stability recommendations identified in the NRC Bulletin No.
88-07, Supplement 1, have been evaluated and incorporated into the appropriate plant operating procedures.
The region of least stability has been defined at the Oyster Creek Nuclear Plant as that area on the power-flow map below 45% flow and above 80% rod line.
Procedurally, the operators are directed to avoid this region.
If this region is unintentionally entered, a predefined set of control rods are to be inserted to reduce core thermal power below the 80% rod line.
If at any time during operation in this region core thermal hydraulic instability does occur, the operators are directed to manually scram the reactor.
In addition, if a recirculation pump trip event occurs such that less than three of the five recirculation pumps are operating, the operators are directed to manually scram the reactor.
A power-flow display in the control room has been updated to provide operators with a visual aid in defining the region of least stability.
This display will be used by the operators to assist in avoiding or exiting from this region.
Several operator training sessions have been completed which have included discussions on reactor instability. During the most recent simulator training, as well as a prestartup training session, operators were trained on the LaSalle power oscillation event in addition to the revisions made to the Oyster Creek Operating Procedures which address the stability issue.
The next Operator Licensing Requalification training will also include a two-hour technical discussion on reactor instability and the required operator response to an instability event.
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