ML20101S549
| ML20101S549 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 01/03/1985 |
| From: | Crouse R TOLEDO EDISON CO. |
| To: | Norelius C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 1-489, NUDOCS 8502050489 | |
| Download: ML20101S549 (2) | |
Text
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Docket No.-50-346 Toteoo License No. NPF-3 Acwano P. Cnoust Serial No. 1-489 vo a,,,,
saaw-January 3, 1985 Mr. C.'E. Norelius, Director
. Division of Reactor Projects
-United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Deac Mr. Norelius:
This letter is to revise Toledo Edison's letter of March 9, 1983 (Serial 1-334), which responded to item of noncompliance 82-34-01, in your February 10, 1983 letter (Log 1-737), Inspection Report 50-346/82-34(DPRP).
Toledo Edison herein offers revised information regarding the item of noncompliance.:
j Violation:
Technical Specification 4.2.1 requires that the Axial Power Imbalance be determined to be within limits once per hour when the Axial Power Imbalance alarm is in-
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operable and the unit is in Mode 1 at greater than 40%
power.
Contrary to the above, for more 'than two' months, the Axial Power Imbalance alarm was inoperable and the Axial Power Imbalance was not calculated hourly.
Initial calibration of the alarm was not performed until more than two months of operations at greater than 40% power and no method existed for determining-operability of the alarm or for alarms covered by Technical Specifications 4.1.2.1.1; 4.1.3.2.1; 4.1.3.3; 4.1. 2.6; 4.1.3.9 ; or 4. 2.4.
In our letteriof March' 9,1983, Toledo Edison committed to incorporate the' asymmetric' rod fault' alarm circuitry test into the control rod exer-cise monthly test. After further evaluation, however, the alarm circuitry.
test was incorporated into ST 5013.03, Control Rod Program Verification on July 5, 1983. The revision to ST 5013.03, which is' performed at each re -
fueling outage, requires verification and documentation that each c'ontrol
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' rod causes an asymmetric' alarm.
THE TOLEDO EDISON COMPANY - EDISON PLAZA. 300 MADISON AVENUE
_ TOLEDOi OHIO 43652_T84/
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8502050489 850103 JAN 71984 i
q PDR ADOCK 05000346 G
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E :ck2t'No. 50-346 D
sb License No.: NPF-3 Serial No. 1-489'
. January 3, 1985
<Page 2-
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- The basis ifor performing this test at' a refueling outage frequency rather than during the monthly control rod exercise test is
- 1. - ' Unless(the reactor is shut.down.on a monthly basis, movement of individual control rods has the potential to cause local-Lized power peaking within the core.
' 2.' -
To move individual control rods at power, the Control Rod
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Drive-System would have to be taken out of "aut2", causing
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unit power to drift with rod movement.
3.
The Station computer performs an independent check for asym-metric rods every 30 seconds and actuates an alarm.
Should.both fault alarms (i.e., asymmetric fault circuitry 4.
/
and computer check)~ fail to indicate an asymmetric rod,
- it would be found by:
a.
The-verification ~ required by Technical Specification 4.1.3.1.1, that the position of eachl control rod shall
- be-determined to be within the group average height
~
limit-by verifying the individual rod positions at least.once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.-
b.
A. Quadrant. Power Tilt -(QPT) alarm wi31 actuate if ' the asymmetric rod creates a large flux-tilt, or c.
The Quadrant Power ~ Tilt being different than normal.
JQPT is available on a CRT in'the Control. Room.
LQuadrant Power Tilt is required to.be' determined 1within limits-as per. Technical Specification 4.2.4.-
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,Very.truly,yours, ffh, __ _ -
RPC:SGW:DJL:nifE
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cc:' DB-1.NRC; Resident' Inspector-
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