ML20116B123
| ML20116B123 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 04/16/1985 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| KMLNRC-85-088, KMLNRC-85-88, NUDOCS 8504250036 | |
| Download: ML20116B123 (2) | |
Text
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,g KANSAS GAS AND ELECTRIC COMPANY THE ELECTAsC COMPANY QLENN LKOESTER YsCE PRELOENT NuCLEAn April 16, 1985 Mr. Robert D. Martin Regional Administrator g g gll U.S. Nuclear Regulatory Commission I
Region IV j
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611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 bL h
j NJ KMLNRC 85-088 Ret Docket No. STN 50-482 Subj: 10 CFR 50.59 Report - Initial Core Loading Procedure Change
Dear Mr. Martin:
This letter is the report pursuant to 10CFR50.59(b) concerning a change to a procedure in the initial core loading test sequence at Wolf Creek Generating Station. This report is submitted in compliance with License Condition 2.C(9) of the Facility Operating License No.
FSAR Section 14.2.10.1 requires neutron detector response of at least 2 counts per second attributable to core neutrons. The 2 counts per second requirement was incorporated in procedure SU7-S009, Initial Core Loading Test Sequence. Procedures also required the use of temporary neutron detectors during core load. Throughout the core loading sequence the temporary neutron detectors indicated greater than 2 counts per second with the permanently installed plant instrumentation indicating slightly less than 2 counts per second.
When the core loading was nearly complete, the temporary source range neutron monitors were required to be removed to allow insertion of the remaining fuel assemblies. Thus neutron count rate monitoring would have been accomplished with the two permanently installed monitors which indicated somewhat less than 2 counts per second. Procedure SU7-S009 was changed to require a detector response of 1/2 count per second to allcw the completion of the fuel loading sequence.
Detector response of the temporary and permanently installed source range instrumentation was carefully monitored during the entire core loading sequence to verify that the detectors were responding properly and that the response was attributable to core neutrons. This was ac-complished by performance of various procedures taking into account wa6 pr"m ma, a6
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201 N. Market - Wictuta, Kansas - Mail Address: PO. Box 208 I Wichita, Kansas 67201 - Telephone: Area Code (316) 261-6451
Mr. R.D.. Martin KMLNRC 85-088
-2 April 16, 1985 such factors as relative detector geometry and proximity of the detectors to the fuel movement activity.
During the performance of this procedure, the alarm function on the permanent source range channels remained functional ensuring an alarm if the count rate were to increase by 5 times or greater.
Regulatory Guide 1.68-1978 indicates that 1/2 count per second is required on plant instrumentation prior to going critical. It is appropriate that this requirement for detector response also be applied to core loading activities.
This procedure change did not result in any unreviewed safety question.
If you have any questions, please contact me or Mr. Otto Maynard of my staff.
Yours very truly Glenn L. Koester Vice President - Nuclear GLKabb xc:JMTaylor-PO'Connor (2)
JCummins