ML20010A334
| ML20010A334 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 07/30/1981 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| LAC-7694, RO-81-08, RO-81-8, NUDOCS 8108110323 | |
| Download: ML20010A334 (2) | |
Text
.. _ _-_.
Ah&/4EL D DA/RYLAND h
COOPERAT/VE
=0 box 8i7 2615 EAST AV SOUTH LA CROSSE WikONSIN 54601 (008) 788 4000 j
July 30, 1981 In reply, please refer to TAC-769tl i
DOCKET NO. 50 t109 Mr. James G. Keppler l
Regional Director i
U. S. Nuclear Regulatory Commission
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Directorate of Regulatory Operations D
f Region III
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799 Roosevelt Road
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Glen Ellyn, Illinois 60137 7:
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SUBJECT:
DAIRYIAND POWER C00PEMAT1VE g-4em IA CROSSE BOILING WATER REACTOR (IACBWR)
C ND'ter PROVISIONAL OPERATING LICENSE NO. DPR-45 4
REPORTABLE OCCURRENCE NO. 81-08 V' r4 N
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REFERENCES:
(1)
IACBWR Technical Specifications,
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Section 6.9.1.ti.i.
(2)
IACBWR Technical Specifications, Section 4.2.5.7.
Dear Mr. Keppler:
In accordance with Reference 1, this is to inform you of performance of a component that required corrective measures to prevent operation l
In a manner less conservative than assumed in accident analyses, t
Reference 2 requires that the main steam bypass valve control be set to begin opening the bypass valve at an Indicated pressure corresponding to a turbine inlet pressure not more than 15 psi above its nominal value, except during plant startup and shutdown.
During operation on July 29, 1981, it was noticed the main steam bypass valve did not open during momentary pressure spikes approximately 20 psi above nominal reactor pressure.
The wide range bypass valve controller setpoint was lowered to approximately 20 psi above nominal pressure.
The narrow range bypass valve controller setpoint wa. lowered until the bypass valve opened.
It was determined the narrow range bypass valve controller was opening the bypass valve approximately 4 psi higher than normal.
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B100110323 810730 DR ADOCK 05000
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Mr. James G. Keppler, R'gional Director LAC-7694 U. S. Nuc1?ar Regulatory Commission July 30, 1981 1
i The narrow range bypsss valve controller setpoint was set at 10 psi
- above nominal reactor pressure to compensate for the 4 psi overshoot.
- Administrative controls were instituted to maintain the setpoint at no greater than 10 psi above nominal reactor pressure.
The wide range Lypess valve controller setpoint was left at 20 psi above. nominal reactor pressure to serve'as backup to the narrow range controller.
Prompt notification of this c/ent was made.to Mr. Len McGregor of the U. S. Nuclear Regulatory Commission, Region III at 0955 on July 30, 1981, 4
by L. S. Goodman, LACBWR Operations Engineer.
If there are any questions concerning this report, please contact us.
Very truly yours, DAIRYLAND POWER COOPERATIVE hus/b ndW c.
Frank Linder,- General Bhnager FL:L8G:eme-ec - Director, Office of' Management Information j
and Program Control- (3)
U.'S. Nuclear Regulatory Commission i
Washington, D. C.
20555 e
NRC Resident Inspectors i
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