ML20203Q237
| ML20203Q237 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 04/17/1986 |
| From: | Randolph G UNION ELECTRIC CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 86-02, 86-2, ULNRC-1299, NUDOCS 8605090148 | |
| Download: ML20203Q237 (2) | |
Text
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t diYW Mr. James G. Keppler Regional Administrator
.e@png Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT I FACILITY OPERATING LICENSE NPF-25 CALLAWAY PLANT POSITIVE MODERATOR TEMPERATURE COEFFICIENT SPECIAL REPORT 86-02
Dear Mr. Keppler:
This report is submitted pursuant to the requirements of Callaway Technical Specification 3.1.1.3.a.
On April 15, 1986 during the conduct of initial Low Power Physics Tests, a positive moderator temperature coefficient of 0.01 pcm/*F was measured per procedure ESP-ZZ-00009, Moderator Temperature Coef ficient Measurement at Zero Power. Low power physics testing continued sub-sequent to this measurement in accordance with Special Physics Test Exception Specification 3.10.3.
Following measurement of isoth'rmal temperature coefficient with Bank D inserted and with Banks D and C inserted, and measurement of bank worths for Control Banks C and D, interim bank withdrawal limits have been determined. These withdrawal limits have been conservatively established to ensure a Moderator Temp-erature Coef ficient of - 1 pcm/*F is maintained. These limits are provided as Attachment 1 to this report. The burnup necessary to re-store a negative Moderator Temperature Coefficient under the most limiting plant conditions (Hot Zero Power, All Rods Out, No Xenon) has been calculated to be 4000 MWD /MTU. This core average burnup carresponds to a Boron Concentration of 1430 pps at the conditions stated and has been calculated to yield a Moderator Temperature Coefficient of - 1 pcm/*F.
The rod withdrawal limits included as Attachment I will be imposed until a core burnup of 4000 MWD /MTU has been achieved.
8605090148 860417 PDR ADOCK 05000483 S
PDR G. L. Randolph Manager, Callaway Plant GLR /WRC/KDA/KRB/ crc g
Attachment gI cc:
USNRC Resident Inspector, Callaway Executive Director, SNUPPS (h
USNRC Licensing Proj ect Manager Manager, Electric Department, J
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M u ic vice Commission Maihng Address: PO. Box 620 Futton, MO 65251 APR 2 81986
FIGURE 2-13 ETP-ZZ-00014 CONTROL R0D WITHDRAWAL LIMITS TO MAINIAIN MIC < 0 EFFECTIVE UP TO 4000 MWD /M U BURNUP, CYCLE 2 I
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