05000346/LER-1978-034-03, /03L-0:on 780326,group 5, Control Rods 11 & 12 Absolute Position Indication Declared Inoperable.Caused Traced to Penetration Area.Updated Rept Will Be Submitted When Exact Cause Determined

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/03L-0:on 780326,group 5, Control Rods 11 & 12 Absolute Position Indication Declared Inoperable.Caused Traced to Penetration Area.Updated Rept Will Be Submitted When Exact Cause Determined
ML19326A432
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 04/21/1978
From: Kovach S
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A431 List:
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 8002030250
Download: ML19326A432 (3)
v • d • e


LER-1978-034, /03L-0:on 780326,group 5, Control Rods 11 & 12 Absolute Position Indication Declared Inoperable.Caused Traced to Penetration Area.Updated Rept Will Be Submitted When Exact Cause Determined
Event date:
Report date:
3461978034R03 - NRC Website
v • d • e

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h for Control Rod 12 of Group l The Absciute Position Indication (API)

Ion 2l The API for Control l operable on 3/26/78 at 0040 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> and on 3/31/78 at 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />.

rip q l These occurrences l l Rod 11 of Group 5 was declared inoperable on 4/3/78 at 1549 hours0.0179 days <br />0.43 hours <br />0.00256 weeks <br />5.893945e-4 months <br />.

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em TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-38 DATE OF EVEUT: March 26, 1978 - April 3, 1978 4

FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Absolute Position Indication (API) for Group 5, Rods 11 and 12 was inoperable.

l 1

The unit was in Modes 1, 2 or 3 with Power (HWT)

. Conditions Prior to Occurrence:

ranging from 0-2336, and Load (MWE) ranging from 0-394.

!~

I Description of Occurrence: On March 26, 1978, the API for Rod 12 of Group 5 was observed to have had sporadic indication.

At 0040 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br />, this Absolute Position On March 31, 1978, at Indication was declared inoperable by the Shift Foreman.

0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br />, the same API was declared inoperable. On April 3, 1978 at 1549 hours0.0179 days <br />0.43 hours <br />0.00256 weeks <br />5.893945e-4 months <br />, the API for Group 5, Rod 11 (displayed on Group 5, Rod 12's position indicating meter) was declared inoperable.

These occurrences placed the unit in Action Statement (a) of Technical Specifica-

~

This Technical Specification requires the operability of all APIS tion 3.1.3.3.

Action Statement (a) of Technical Specification 3.1.3.3 speci-in Modes 1 and 2.

I fies that operation may continue provided that the position reference indicator i

(zone reference) of the control rod is verified within eight hours of the occur-rence, and at least once per twelve hours thereafter.

i l

In each case, Group 5 was placed in the asymmetric bypass condition.

I Although the exact cause of these Designation of Apoarent Cause of Occurrence:

occurrences is not yet known, the problem has been traced to the penetration When the cause is known, an updated report will be submitt'ed.

area.

4 There was no-danger to the health and safety of the Analysis of Occurrence:

The Relative Position Indication (RFI) as well as public or to unit personnel.

zone reference indication for each rod was operable during the period that each 1.

j API was inoperable.

Surveillance requirements 4.1.3.3 as well as the requirements Corrective' Action:

of Action Statement (a) was followed.

As reported in Licensee Event Report NP-33-78-26, Maintenance personnel performed an inspection of connectors and cable at the bulkhead, control rod drive =echanism, and position indicator tube for Control Rod Drive Group 5 Rod 12 under Maintenance Since Licensee Event Report NP-33-78-26 was written, Work Order (11WO)78-319.

LER 67S-034

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i TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR ' POWER STATION I

SUPPLEMENTAL INFORMATION FOR LER NP-33-78-38

. PAGE]

4 Maintenanc,e has replaced the cable from the API tube to the bulkhead ()NO 78-512).

i NNO 718-78 was issued (af ter approval of Facility Change Request 78-169) to i

change wires at the penetration from Rod 12 to a spara and to switch the position indication cables for Rods 11 and 12 at the position indication tubes. The posi-t tion indication patch for Rods 11 and 12 were exchanged under MWO IC 277-78. On March 30, 1978, the patch and position cables were returned to their original con-i.

figuration.

On March 31, 1978, under Facility Change Request (FCR)78-173, the position indi-cation cable for Group 5 Rod 12 was switched with the position indication cable 4

l for Group 5 Rod 11.

In addition, the cable for Group 5 Rod 12 from the penetration to the bulkhead was replaced with a new one. All work was performed under MWO 78-512. This change was recommended by Diamond Power Specialty Corporation as an aid in cr,oubleshooting the Group 5 Rod 12 problem. As a result of this change, the API signal for Group 5 Rod 12 was on Group 5 Rod 11s API meter and vice versa.

Relative Position Indication for each rod remained unaffected. The zone reference lights for Group 5 Rod 12 were displayed on Group 5 Rod ils zone reference lights, and vice versa.

1 On April 7, 1978 under FCR 78-180 and ISO IC 285-78, the API signal leads for Group 5 Rod 11 were exchanged with the API signal leads for Group 5 Rod 12 at the 1

' penetration. The APIS for both Rod 11 and 12 of Group 5 were inoperable for the few minutes required to switch cables.

RPIs and zona reference lights for each rod were operable during this time. The API signals for Group 5 Rods 11 and 12 I

were returned to their respective meters. The zone reference lights for Rod 12 of Group 5 were still displayed on Rod 11 Group 5s zone reference lights. As a result of this change, it was determined that the problem with the API on Rod 12

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of Group 5 originated in the penetration area.

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The unit was removed from Action Statement (a) of Technical Specification 3.1.3.3 on March 30,1978 at 1750 hours0.0203 days <br />0.486 hours <br />0.00289 weeks <br />6.65875e-4 months <br />, on March 31, 1978 at 1845 hours0.0214 days <br />0.513 hours <br />0.00305 weeks <br />7.020225e-4 months <br /> and on April 6, 1978 at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br />, af ter performance of Surveillance Test ST 5013.03, "Contain-ment Pressure to SEAS Channel Calibration".

j Absolute Position Indication for Group 5 Rod 12 (on ll, 5s API meter) remains inoperable as of April 19, 1978.

Due to high radiation levels inside containment during.present power operation, further investigation in the penetration area has been scheduled for the next outage. Also during this time, position indication ' ables for Group 5, Rods 11 c

and 12 will be returned to these original rods.

Failure Data:.The API for Rod 12, Group 5 was inoperable in three previously reported. occurrences, Li:ensee Event Reports NP-33r78-02, NP-33-78-19 and

,,,s NP-13-7S-26.

7 tis is a repetitive occurrence but the cause has not yet been

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determined.

i LIK #78-034

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