05000414/LER-2007-001, Regarding Failure to Comply with Action Statement in Technical Specification (TS) 3.3.1 for Loss of a Channel of the Solid State Protection System

Regarding Failure to Comply with Action Statement in Technical Specification (TS) 3.3.1 for Loss of a Channel of the Solid State Protection System

ML071990097
Person / Time
Site:	Catawba
Issue date:	07/10/2007
From:	Morris J Duke Energy Carolinas, Duke Power Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 07-001-00
Download: ML071990097 (19)

LER-2007-001, Regarding Failure to Comply with Action Statement in Technical Specification (TS) 3.3.1 for Loss of a Channel of the Solid State Protection System

Event date:
Report date:
4142007001R00 - NRC Website

text

JAMES R MORRIS Dkerg Vice President

?Energy, Catawba Nuclear Station 4800 Concord Road / CNO1 VP York, SC 29745-9635 803 831 4251 803 831 3221 tax July 10, 2007 U.

S. Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555

Subject:

Duke Power Company, LLC d/b/a Duke Energy Carolinas, LLC (Duke)

Catawba Nuclear Station, Unit 2 Docket No.

50-414 Licensee Event Report 414/07-001 Attached is Licensee Event Report 414/07-001 titled "Failure to Comply with Action Statement in Technical Specification (TS) 3.3.1 for Loss of a Channel of the Solid State Protection System."

There are no regulatory commitments contained in this letter or its attachment.

This event is considered to be of no significance with respect to the health and safety of the public. If there are any questions on this report, please contact A.P. Jackson at 803-831-3742.

Sincerely, James R.

Morris Attachment www. duke-energy. corn

U.

S.

Nuclear Regulatory Commission July 10, 2007 Page 2 xc (with attachment):

W. D. Travers, Region II Administrator U.S. Nuclear Regulatory Commission Sam Nunn Atlanta Federal Center, 23 T85 61 Forsyth St.,

SW Atlanta, GA 30303-8931 J.

F.

Stang, Jr.,

Senior Project Manager (CNS & MNS)

U.

S.

Nuclear Regulatory Commission 11555 Rockville Pike Mail Stop 0-8 H 4A Rockville, MD 20852-2738 A.T. Sabisch NRC Senior Resident Inspector Catawba Nuclear Station INPO Records Center 700 Galleria Place Atlanta, GA 30339-5957 Marsh & McLennan, Inc.

K.

W. Gannaway 100 N.

Tryon Street Charlotte, NC 28202

U.

S.

Nuclear Regulatory Commission July 10, 2007 Page 3 bxc (with attachment)

J.

R. Morris -

EC07H T.

M. Hamilton -

CN01SA K.

D. Thomas -

ECO5P R.

L. Gill EC05P K.

L. Ashe MG01RC R.

D. Hart CN01RC K.

L. Crane MG01RC K.

E. Nicholson CN01RC NCMPA-1 SREC PMPA NCEMC CNS Master File -

CN04DM (File CN 801.01)

CNS Date File LER File ELL -

EC050 bxc:

(electronic copy - with attachments):

lerevents@inpo.org

Abstract

At 2149 on May 10, 2007 during maintenance on the Solid State Protection System B-train 48VDC power supply, the channel 4 overtemperature delta temperature (OTDT) trip setpoint became inoperable due to a failure of the axial flux imbalance circuit card. However, for the plant conditions that existed at that time, the OTDT channel was not recognized as being inoperable using normal control room board indications. Therefore, the inoperable channel was not placed in the trip condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> (or be in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />) as required by Technical Specifications 3.3.1. The channel was placed in the trip condition after approximately 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> and 1 minute.

The safety significance of this event is minimal. The OTDT trip function is not credited in the current safety analysis or fuel design; the existing plant conditions did not challenge the OTDT trip setpoint, and the remaining 3 operable OTDT channels would have generated an OTDT trip signal for all appropriate plant conditions. This event does not involve a safety system functional failure.

NRC FORM 366 (6-2004)

(If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)

ADDITIONAL INFORMATION

Within the last three years, there have not been any previous similar occurrences at Catawba. Therefore, this event was determined to be non-recurring in nature.

Energy Industry Identification System (EIIS) codes are identified in the text as [EIIS: XX].

There are no EPIX reportable equipment failures associated with this report.

This event did not involve a Safety System Functional Failure.

There were no releases of radioactive materials, radiation exposures, or personnel injuries associated with this event.

Compliance Functional Area Manual 3.7 Licensee Event Reports Rev. 1 ATTACHMENT G REPORT ENCLOSURES DUKE POWER COMPANY (IJ47-At--, 84 Nuclear Station Co 7-~2565~

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Reviewed By:

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Date:

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Date:

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VERIFY HARD COPY AGAINST WEB SITE iIMEEDIATELY PRIOR TO EACH USE Nuclear Policy Manual -. Volume 2 NSD 227 APPENDIX H. NRC CORRESPONDENCE REVIEW AND CONCURRENCE FORM Apolicable Site(s)

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Commitments Made? (Y/N)

PORC Approval Date:

7 NSRB Approval Date:

UFSAR Revision? (Y/N)

A (Required to satisfy RG 1.70,10 CFR 50.34 (b) or1OCFR 50.71(e)?)

Submittal Lead Name 4, P J

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Content Development (Attach additional information as needed)

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,Checker Name/Site Signature Validation of Entire Document Date Manager Approval (Attach additional information as needed)

Manager/Group Signature Specific Portions or Subjects Approved Date Regulatory Review Reviewer Name Signature Nature of Review Date Submital Lead 4IPJA-IVSJ A1,*4 EN -i i r,&

RGC Function Manager (e.-

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I,,11 Site Vice President Legal Dept. Review Name Signature I

Nature of Review Date This completed form must be presented with the original submittal for signature. The form may be filled in with reference to emailed information in place of actual signatures and required information so long as the emailed information is maintained with the copy of this form that is sent to Master file and ELL REVISION 4 43 VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO EACH USE

Problem Investigation Process Catawba Nuclear Station 0IP Siia1. No Actio6 Categor.:,

" LER No:

Other Report:

C-07-03408 4

Problem Identification Discovered Time/Date:

16:32 07/05/2007 Occurred Time/Date:

Unit(s) Affected:

Unit Mode

%Power Unit Status Remarks 2

N/A 100 n/a System(s) Affected:

N/A Not Applicable to Any System Affected Equipment (No Equipment Affected)

Location of Problem:

Bldg:

Column Line:

Elev:

Location Remarks:

Method Used to Discover Problem:

Brief Problem Description:

PORC Meeting on 7/5/07 - Failure to Comply with Action Statement in TS 3.3.1 for loss of a Channel of Solid State Protection System Detail Problem Description:

A PORC meeting was held on 7/5/07 concerning the Failure to Comply with Action Statement in TS 3.3.1 for loss of a Channel of Solid State Protection System. The following corrective actions were identified during meeting:

All corrective actions from the PORC are to be resolved by RCG I.

LER Section 5, Event Date - correct date from 10th to I I th.

2.

LER Section 13 - Decide if reportable to EPIX. If it revise paragraph on lasi page of the document.

3.

LER Section 16 LER, Abstract section - Revise the second sentence for clarity of meaning.

4.

LER Section 16, Event Description section - Add statement that SSPS B Train was placed in test and include the time. Also add a statement that SSPS B Train was returned to normal conditions.

5.

LER Section 16, Event Description section, 2149 timeframe - add information describing why the annunciator alarm was not diagnosed correctly.

6.

LER Section 16, Event Description section, 2149 timeframe - Revise the 3rd paragraph to include Operations interfacing with Maintenance and Engineering.

7.

LER Section 16, Causal Factors section - Remove the word critical in the second sentence, and the words acting alone in the third sentence.

8.

LER Section 16, Corrective Action section, Subsequent - change time for 1914 to 1911.

9.

LER Section 16, Corrective Action section, Planned, I - Maintenance and Operation will have completed their operating experience communications about the event with their groups prior to the LER being sent to the NRC. Revise wording to reflect this.

10.

LER Section 16, Safety Analysis section - Revise the third paragraph to better reflect the state of the OUdT function and what indications were available' to Operations.

HI.

LER Section 16, Safety Analysis section - In the sixth paragraph, verify that the 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 minutes time is correct.

12.

Last page of the document, check the numbering of pages.

The PORC members unanimously approved the LER with the condition that all corrective actions are resolved. The revised LER will be reviewed by the SRG Manager for final approval.

0711012007 07:05 Page I PIP No: C-07-03408

Problem Investigation Process Catawba Nuclear Station Originated By: GTM7337: MODE, GERALD T Team: PAM7334 Group: C-SRG Date: 07/05/2007 Other Units/Components/Systems/Areas Affected(YXNU): N Industry Plants Affected(Y,N,U): U

Immediate Corrective Actions

Immediate Corrective Action Documents / Work Orders:

Problem Identified By:

Problem Entered By:

Screening Action Category: 4 OEP No:

Other Report Nos:

lndiv GTM7337 GTM7337 Team PAM7334 PAM7334 Group Date C-SRG C-SRG 07/05/2007 07/05/2007 Root Cause performed? No Event Codes:

013 Y9 PORC Safety Assurance Screening Remarks:

Screened by the Centralized Screening Team on July 9, 2007. No changes were made to the original screening.

Last Updated By: RSP5945: PURSLEY, R STEVE Team: PAM7334 Group: C-SRG Date: 07/09/2007 Originated By: GTM7337: MODE, GERALD T Team: PAM7334 Group: C-SRG Date: 07/05/2007 Assignments:

Responsible Groups(s) for Problem Evaluation:

Responsible Group for Report Support Info:

Responsible Group for Reportability:

Responsible Group for Overall PIP Approval:

Responsible Group for Present Operability:

N/A N/A C-MGT N/A [Signature.T~ype.y 7

K i:-,:

Group Date Screened By:

RSP5945 PAM7334 C-SRG 07/09/2007 Present Operability Responsible Group:

Sys/Comp Operable? (Y,N,C,E,T):

Required Mode:

Status:

07/10/2007 07:05 Page 2 PIP No: C-07-03408

Problem Investigation Process Catawba Nuclear Station Comments:

No Current Signatures For This Section

Reportability

Responsible Group:

Status:

Problem Reportable(Y,N,E):

Reportable Per:

Comments:

No Current Signatures For This Section Investigation Report:

Responsible Group:

Investigator:

Act Date:

Group:

Due Date:

Date Due to VP or Sta. Mgr:

Date Regulatory or Agency Rpt Due:

Date Investigation Report Approved:

NRC Cause Codes:

Report Support Info:

Responsible Group:

Status:

No Current Signatures For This Section Problem Evaluation

' Cause Evnt Coe Causc Desdription Primary Causing Grouips Problem Evaluation From:

Corrective Actions

N/A CA Seq. No: 1

~Re~GI-OLIP 5jt 3

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CauLseCd C-RGC Closed C-SRG 013 R

Proposed Corrective Action:

All corrective actions from the PORC are to be resolved by RCG.

I.

LER Section 5, Event Date - correct date from 10th to 1 I th.

2.

LER Section 13 - Decide if reportable to EPIX. If it revise paragraph on last page of the document.

3.

LER Section 16 LER, Abstract section - Revise the second sentence for clarity of meaning.

0711012007 07:05 Page 3 PIP No: C-07-03408,

Problem Investigation Process SCatawba Nuclear Station

4.

LER Section 16, Event Description section - Add statement that SSPS B Train was placed in test and include the time. Also add a statement that SSPS B Train was returned to normal conditions.

5.

LER Section 16, Event Description section, 2149 timeframe - add information describing why the annunciator alarm was not diagnosed correctly.

6.

LER Section 16, Event Description section, 2149 timeframe - Revise the 3rd paragraph to include Operations interfacing with Maintenance and Engineering.

7.

LER Section 16, Causal Factors section - Remove the word critical in the second sentence, and the words acting alone in the third sentence.

8.

LER Section 16, Corrective Action section, Subsequent - change time for 1914 to 1911.

9.

LER Section 16, Corrective Action section, Planned, 1 - Maintenance and Operation will have completed their operating experience communications about the event with their groups prior to the LER being sent to the NRC. Revise wording to reflect this.

10.

LER Section 16, Safety Analysis section - Revise the third paragraph to better reflect the state of the OTdT function and what indications were available to Operations.

11.

LER Section 16, Safety Analysis section - In the sixth paragraph, verify that the 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 minutes time is correct.

12.

Last page of the document, check the numbering of pages.

Originated By: GTM7337: MODE, GERALD T Team: PAM7334 Group: C-SRG Date: 07/05/2007

Sjgnature*Ty e

.. * *lndiv K

• '. K*

KK qeTamfi Group Date Ready For Approval:

GTM7337 PAM7334 C-SRG 07/05/2007 Approval Assigned To:

PAM7334 PAM7334 C-SRG 07/05/2007 Approved By:

GTM7337 PAM7334 C-SRG 07/05/2007 General:Outage:

Mode:

Other Tracking Processes Type Number Text Actual Corrective Action:

Priority: N Actual CAC: A2 Status: Closed Due Date: 07/19/2007 Resolution of PORC CAC's on 7300 Card Failure LER 414/07-001:

1. LER Section 5, Event Date - correct date from I 0th to 11 th.

The event date has been changed to the 11 th or May 2007 since the failure to comply with the TS action statement actually occurred on the 11th.

2. LER Section 13 - Decide if reportable to EPIX. If it revise paragraph on last page of the document.

This is not reportable under EPIX, however, the Section 13 information on the form was completed with a "No" answer and this information was repeated on the last page of the document.

3. LER Section 16 LER, Abstract section - Revise the second sentence for clarity of meaning.

The second sentence was revised to state: However, for the plant conditions that existed at that time, the OTdT channel was not recognized as being inoperable using normal control room board indications.

4. LER Section 16, Event Description section - Add statement that SSPS B Train was placed in test and include the time. Also add a statement that SSPS B Train was returned to normal conditions.

The following statements were added to the time line:

5/10/07 20:50 Unit 2 SSPS B Train was placed in "Test" Mode 5/11/07 0004 Unit 2 SSPS B Train was returned to Normal.

07/10/2007 07:05 Page 4 PIP No: C-07-03408

Problem Investigation Process Catawba Nuclear Station These dates and times were obtained from TSAIL.

5. LER Section 16, Event Description section, 2149 timeframe - add information describing why the annunciator alarm was not diagnosed correctly.

The final paragraph is shown below:

Maintenance personnel performed a visual inspection for circuit card failures in 2PCC4 immediately after the alarm and found no apparent cause of the alarm. Also, the control board indications did not show any unusual or failed instrumentation. Maintenance personnel discussed the possible causes of the alarm with Operations and Engineering. Due to the Complex Activity of the power supply replacement in progress, it was decided that the conservative action would be to be to stop all intrusive troubleshooting on the panels until dayshift. Since it was concluded that the probable cause of the alarm was an annunciator card failure, an opportunity for further troubleshooting and diagnosis of the problem in a timely manner was missed.

6. LER Section 16, Event Description section, 2149 timeframe - Revise the 3rd paragraph to include Operations interfacing with Maintenance and Engineering.

See the rewritten paragraph above.

7.

LER Section 16, Causal Factors section - Remove the word critical in the second sentence, and the words acting alone in the third sentence.

The sentences were revised to read:

The error occurred when the technician failed to notice the LED extinguished on the OTDT card C4-232 in 2PCC4. This individual failed to identify the failure of the card C4-232 NCH.

8.

LER Section 16, Corrective Action section, Subsequent - change time for 1914 to 1911.

1911 was verified to be the correct time via TSAIL entry C2-07-01099.

9.

LER Section 16, Corrective Action section, Planned, 1 - Maintenance and Operation will have completed their operating experience communications about the event with their groups prior to the LER being sent to the NRC. Revise wording to reflect this.

The PLANNED RESPONSE SECTION now reads:

I.

Operations and Maintenance departments have communicated this event to the organizations to be used as Operating Experience (OE) and as lessons learned.

Communications were sent out Monday July 9, 2007 by MNT and OPS.

10.

LER Section 16, Safety Analysis section - Revise the third paragraph to better reflect the state of the OTdT function and what indications were available to Operations.

This section was revised to read:

The OTdT channels are not modeled explicitly in the Probabilistic Risk Analysis (PRA) because of the redundancy of the system. The only function adversely affected during the time period of interest was the Unit 2, Channel 4 axial flux input to the OTdT function. With the axial flux input functional unit inoperable, the OTdT function for Channel 4 was degraded. However, at 100% power the axial flux input would be zero and the other inputs to Channel 4 OTdT remained operable and would have responded if called upon.

Thus, the reliability of the OTdT function was degraded, but the remaining OTdT trip logic was operable and if needed would have tripped the 0711012007 07:05 Page 5 PIP No: C-07-03408

Problem Investigation Process Catawba Nuclear Station reactor, when required. During the 13 hour1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> and 1 minute time period of interest, additional multiple failures would have been required such that an OTdT reactor trip, if required, would not actuate.

11. LER Section 16, Safety Analysis section - In the sixth paragraph, verify that the 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 minutes time is correct.

This time was verified correct via TSAIL entry C2-07-1095 which shows SSPS being returned to NORMAL at 00.04 on 5/11/07. The time in question was the time from which SSPS was in TEST and the Card was blow. The card blew when the fuse was installed at 21:49 on 5/10/07.

Subtracting the two times yeilds 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 15 minutes.

12. Last page of the document, check the numbering of pages.

The pages have been renumbered to reflect the total number of pages.

Originated By: APJ7336: JACKSON, ANTHONY P Team: RDH5775 Group: C-RGC Date: 07/09/2007 SignatureType I::

,)ndiv,

• :::

2Team,:**

. ::G o p ate.

Due Date:

07/19/2007 Accepted By:

RDH5775 RDH5775 C-RGC 07/09/2007 Assigned To:

APJ7336 RDH5775 C-RGC 07/09/2007 Ready For Approval:

APJ7336 RDH5775 C-RGC 07/09/2007 Approval Assigned To:

RDH5775 RDH5775 C-RGC 07/09/2007 Approved By:

RDH5775 RDH5775 C-RGC 07/10/2007 Final and Overall PIP Approval Responsible Group: C-MGT Status: ReadyForApprove Assigned To:

C-MGT 07/09/2007 Due Date:

Any Supplemental Concurrence Signatures Above Do Not Affect PIP Closure.

Closure Document Type Closure Document No Attachments Generic Applicability Responsible Group:

Status:

GO PIP No:

Assessment Remarks:

No Current Signatures For This Section Failure Prevention Investigation No FPI Records for this PIP.

Remarks No Remarks for this PIP.

Maintenance Rule No Maintenance Rule Records for this PIP.

0711012007 07:05 Page 6 PIP No: C-07-03408

Problem Investigation Process Catawba Nuclear Station End of the Document for PIP No:

The status of this PIP is:

This PIP has been open for: 5 days C-7-3408 ReadyForApprove (Note: All Corrective Actions were printed in this report.)

07/10/2007 07:05 Page 7 PIP No: C-07-03408