ML19323G470
| ML19323G470 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 05/15/1980 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-79-26, NUDOCS 8006020545 | |
| Download: ML19323G470 (2) | |
Text
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'D DA/RYLAND h
COOPERATNE eo Boxsi7 2 sis E,,ST AV SOUTH. LA CROSSE. WISCONSIN S4001 (608) 7884 000 May 15, 1980 In reply, please refer to LAC-6918 DOCKET NO. 50-409 j
Mr. James G.
Keppler Regional Director U.
S.
Nuclear Regulatory Commission dkP Directorate of Regulatory Operations gE
/pgg i
Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
SUBJECT:
DAIRYLAND POWER COOPERATIVE a
LA CROSSE BOILING WATER REACTOR (LACBWR)
PROVISIONAL OPERATING LICENSE NO. DPR-45 IE BULLETIN NO. 79-26
Reference:
(1)
NRC Letter, Keppler to Linder, enclosing IE Bullotin No. 79-26, dated November 20, 1979, i
Dear Mr. Keppler:
The subject IE Bulletin discussed a potential failure mode which has been observcd in General Electric Company (GE) control blades which can cause a loss of baron poison material through cracks in the stainless steel tubing containing the B4C.
The IE Bulletin also stated four specific items requiring certain actions and reports from all BWR power reactor facilities with an operating license.
The findings as to Item (3) for the LACBWR is reported below.
On April 6,_1980, the LACBWR was shutdown for scheduled maintenance including the installation of equipment required by NUREG-0578.
While the reactor was in the cold shutdown condition on the 19th of April, each control blade was individually fully withdrawn and it was demonstrated tha. the reactor was subcritical with any one control blade withdrawn and the other 28 blades fully inserted.
On April 26, 1980, with the reactor in the cold xenon-free condition, a shutdown margin test was conducted which demonstrated that the l
shutdown margin with the highest worth control blade fully withdrawn i
and the other 28 blades fully inserted was at least 2.06% Ak/k.
The LACBWR Technical Specification requirement for shutdown margin in this conditicn is 0.5% Ak/k.
Since no control blade in the LACBWR.
l
-0006020598iCL.
Mr. James G.
Keppler LAC-6918 Regional Director May 15, 1980 has greater than 34 percent Bio depletion averaged over the upper one-fourth of the blade, the potential loss of boron from control blades was not a factor in this test.
If you have any questions concerning this submittal, please contact us.
Very truly yours, DAIRYLAND POWER COOPERATIVE 9
C~
<t h Frank Linder, General Manager FL:SJR:af cc:
U.
S. Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D.
C.
20555 l
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