ML20052H870

Forwards LER 82-013/03L-0.Detailed Event Analysis Encl

ML20052H870
Person / Time
Site:	Fort Saint Vrain
Issue date:	05/12/1982
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20052H871	List: ML20052H870 ML20052H875
References
P-82132, NUDOCS 8205240099
Download: ML20052H870 (5)

Text

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public Servlee Company F Odlerado 4

16805 Road 19 1/2, Platteville, Colorado 80651-9298 May 12, 1982 Fort St. Vrain Unit No. 1 a 2132 g g g g [j y f g 3 ,

i PAY I 71982 Mr. John T. Collins, Regional Administrator _

Region IV Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011

Reference:

Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Collins:

Enclosed please find a copy of Reportable Occurrence Report No. 50-267/82-013, Final, submitted per the requirements of Technical Specification AC 7.5.2(b)2 and 7.5.2(b)3.

Also, please find enclosed one copy of the Licensee Event Report for Reportable Occurrence Report No. 50-267/82-013.

Very truly yours, L LJean k o a <p & 19N ndA Don Warembourg Manager, Nuclear Production DW/lsb Enclosure cc: Director, MIPC Yd \

Ji 8205240099 820512 PDR ADOCK 05000267 S PDR

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, l REPORT DATE: May 12, 1982 REPORTABLE CCCURRENCE 82-013 ISSUE 0 OCCURRENCE DATE: Aoril 12, 1982 Page 1 of 4 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 19 1/2 PLATTEVILL2, COLORADO 80651-9298 1 REPORT NO. 50-267/82-013/03-L-0 Final IDENTIFICATION OF OCCURRENCE:

During a planned power reduction, between April 11 and 12,1982, the 1

Fort St. Vrain Technical Specification limitation on controi rod" group axial position separation was exceeded. This is a degraded mode of Limiting Condition for Operation 4.1.4, and is reportable per Fort St. Vrain Technical Specifications AC 7.5.2(b)2 and 7.5.2(b)3.

EVENT DESCRITIPTION:

Fort St. Vrain Limiting Condition for Operation 4.1.4 requires that all rod pairs must be either fuliy inserted or fully withdrawn except that: (a). . . two groups of three rod pairs. . . may be partially inserted, provided the two groups axial positions are separated by at i least 10 feet." Contrary to this limitation, on April 12, 1982, the axial separation of rod groups 2A and 40 was observed to be 9'4".

At the onset of the occurrence, all rod groups were correctly positioned, in accordance with normal operating procedures. In this configuration, rod group 2A was fully withdrawn and rod group 4D was partially inserted.

At 1608 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.11844e-4 months <br />, April 11,1982, while reducing the reactor power to approximately 9%, rod group 2A was partially inserted, resulting in an axial separatien between rod groups 2A and 4D to be less than the 10 feet specified by LCO 4.1.4(a). (Refer to Table 1 for rod groups 2A and 40 axial position summary.) The out of limits condition remained until 0638 hours0.00738 days <br />0.177 hours <br />0.00105 weeks <br />2.42759e-4 months <br />, April 12, 1982, when the condition was noticed and corrected, within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> required by LC0 4.1.4(a). 1 There were no accompanying circumstances or occurrences.

CAUSE DESCRIPTION:

Operator error.

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REPORTABLE OCCURRENCE 82-013 ISSUE O Page 2 of 4 CORRECTIVE ACTION:

Reactor Operator repositioned control rod groups 2A and 40, in accordance with procedures, to comply with the LCO- 4.1.4 limitation on axial position separation.

. Instruction has been included in operator training emphasizing the requirements and significance of LCO 4.1.4. -

No further corrective action is anticipated or required.

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-REPORTABLE OCCURRENCE 82-013 ISSUE O

.oa ge 3 of 4 FIGURE 1 ROD GROUP AXIAL POSITION

SUMMARY

Rod Group 2A = Rod Pairs 2. 4, 6 Rod Group 40 = Rod Pairs 23, 29, 35 l Rod Group Axial Position,I Rod-Grnup Axial l Time and Date l -

l Mean Average l l l l 2A l 40 l Separation, AZ l i I I I I i 1 l l Z, Inches ] Z, Inches I aZ, IncheslaZ, Feet i Hour i Day [

l I i l i l l l 191.6 I 45.0 l 146.6 i 12.2 1 1552 I 4-11-82 l l l 1 1 I I I I 171.8 I 45.0 1 126.9 l 10.6 l 1553 I 4-11-82 l l 1 I I I I I I 162.8 I 45.0 1 117.8 I 9.8 l 1608 I 4-11-82 l l l l l l l l l 159.1 1 45.0 l 114.1 I 9.5 l 1725 1 4-11-82 l l l 1 I I I I l 158.3 l 45.0 l 113.3 l 9.4 1 0634 I 4-12-82 l l l l 1 1 I i l 191.6 1 4.1 1 187.5 l 15.6 l 0638 l 4-12-82 l s

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-,-e-T REPORTABLE OCCURRENCE 82-013 ISSUE O Page 4 of 4 Prepared By:

' Paul A Tramp '

Technical Services Technician Reviewed By:

Charles Fuller d

Technical Services Engineering Supervisor

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Reviewed By: /

Edwin 0/. IfPIT Station Manager Approved By: Co, We m b.v e, Don Waremoourg '

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Manager, Nuclear Production

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