05000414/LER-2003-001, For Catawba Unit 2 Two Channels of RWST Level Instrumentation Were Rendered Inoperable Following Lightning Strike, Resulting in Technical Specification Violation

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For Catawba Unit 2 Two Channels of RWST Level Instrumentation Were Rendered Inoperable Following Lightning Strike, Resulting in Technical Specification Violation
ML032940563
Person / Time
Site: Catawba 
Issue date: 10/09/2003
From: Jamil D
Duke Power Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 03-001-00
Download: ML032940563 (10)
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LER-2003-001, For Catawba Unit 2 Two Channels of RWST Level Instrumentation Were Rendered Inoperable Following Lightning Strike, Resulting in Technical Specification Violation
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
10 CFR 50.73(a)(2)(ix)(A)
10 CFR 50.73(a)(2)(iii)
10 CFR 50.73(a)(2)(x)
10 CFR 50.73(a)(2)(iv)(A), System Actuation
10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor
10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat
10 CFR 50.73(a)(2)(v), Loss of Safety Function
4142003001R00 - NRC Website
v • d • e

text

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Duke E Power, A Duke Energy Company D.M. JAMIL Vice President Duke Power Catawba Nuclear Station 4800 Concord Rd. / CN0I VP York, SC 29745-9635 803 831 4251 803 831 3221 fax October 9, 2003 U.S. Nuclear Regulatory Commission Attention:

Document Control Desk Washington, D.C. 20555

Subject:

Catawba Nuclear Station, Unit 2 Docket No. 50-414 Licensee Event Report 414/03-001 Attached is Licensee Event Report 414/03-001 titled "Two Channels of RWST Level Instrumentation Were Rendered Inoperable Following Lightning Strike, Resulting in Technical Specification Violation."

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 L.J. Rudy at (803) 831-3084.

Dhiaa M. Jamil Attachment www. duke-energy. corn

Document Control Desk' Page 2 October 9, 2003 xc (with attachment):

Mr. Luis A. Reyes Regional Administrator, Region II U.S. Nuclear Regulatory Commission 61 Forsyth Street, S.W., Suite 23T85 Atlanta, GA 30303 Mr. Robert E. Martin (addressee only)

NRC Senior Project Manager U.S. Nuclear Regulatory Commission Mail Stop 08-H12 11555 Rockville Pike Rockville, MD 20852-2738 Mr. Eugene F. Guthrie NRC Senior Resident Inspector Catawba Nuclear Station INPO Records Center 700 Galleria Place Atlanta, GA 30339-5957 Marsh & McLennan, Inc.

Mr. Kenneth W. Gannaway 100 N. Tryon Street Charlotte, NC 28202

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NRC FtYAM 366 U.S. NUCLEAR REGULATORY APPROVED BY OMB NO. 3150-0104 EXPIRES 7-31-2004 (7-2001)

COMMISSION disthe NRC may not conduct or sponsor, and a person Is not required to respond to, the bnf.,rm tieln,.in Ip' 'nn

3. PAGE Catawba Nuclear Station, Unit 2 05000 414 1 OF 6
4. TITLE Two Channels of RWST Level Instrumentation Were Rendered Inoperable Following Lightning Strike, Resulting in Technical Specification Violation
5. EVENT DATE
6. LER NUMBER f
7. REPORT DATE
6.

OTHER FACILITIES INVOLVED l

FACILITY NAME DOCKET NUMBER MO DAY YEAR YEAR NUMBER NO MO DAY YEAR FACILITY NAME DOCKET NUMBER 08 16 2003 2003 001 00 10 09 2003

9. OPERATING 11.THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: ( heck all that apply)

MODE 1

20.2201 (b) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(B) 50.73(a)(2)(ix)(A)

10. POWER 20.2201 (d) 20.2203(a)(4)

_ 50.73(a)(2)(iii) 50.73(a)(2)(x)

LEVEL 100%

20.2203(a)(1) 50.36(c)(1)(i)(A) 50.73(a)(2)(iv)(A) 73.71 (a) (4) ir.5Sv-,ta 5

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=20.2203(a)(2)(i) _

50.36(c)(1)(ii(A 50.73(a)(2)(v)(A) 73 7a)(5) 20.2203(a)(2)(ii)

X 50.36(c)(2)

_ 50.73(a)(2)(v)(B)

Speci InAbstractbelow 20.2203(a)(2)(ii) 50.46(a)(3)(ii) 50.73(a)(2)(v)(C) or In

Abstract

On August 16, 2003, at 0753, Channels 1 and 3 of Refueling Water Storage Tank (RWST) level instrumentation failed high in response to an apparent lightning strike in the area.

Both of the failed channels were placed in bypass and Unit 2 entered Technical Specification (TS) Limiting Condition for Operation (LCO) 3.0.3.

Unit 2 began a TS required shutdown at 0850 and the NRC Operations Center was subsequently notified.

Catawba pursued a Notice of Enforcement Discretion (NOED) with NRC Region II to allow an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> to troubleshoot and repair the failed level channels prior to having to place Unit 2 in Mode 3. The NRC verbally granted the NOED at 1115.

The first of the two inoperable channels was restored to operable status at 1357, which allowed Unit 2 to exit LCO 3.0.3; therefore, the NOED was never actually utilized.

The root cause of this event was determined to be the fact that Channels 1 and 3 of RWST level instrumentation appear particularly sensitive to the effects of lightning.

Planned corrective actions in response to this event include improving the RWST level transmitter grounding circuits and quality of ground connections.

NRC FORM 366 (7-2001)

NRC FOr.YM 366AU.S. NUCLEAR REGULATORY COMMISSION.-

(1.2001)

LICENSEE EVENT REPORT (LER)

DOCKET (2)

FACILITY NAME (1)

NUMBER (2)

LER NUMBER (6)

PAGE (3)

SEQUENTIAL REVISION YEAR NUMBER l NUMBER Catawba Nuclear Station, Unit 2 05000414 2003 001 -

00 2

OF 6

NARRATIVE

(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) dedicated operator in the control room to monitor level indication on the two operable. channels upon receipt of a Safety Injection signal.

The operator was to monitor the RWST level channels for proper tracking by monitoring RWST level decrease and corresponding containment sump level increase during the injection phase of a loss of coolant accident.

If automatic swapover did not occur, the dedicated operator was to inform the control room Senior Reactor Operator (SRO) that manual swapover to the containment sump was required.

This dedicated operator was also to inform the control room SRO to perform a manual swapover if containment sump level reached 4.5 feet, regardless of RWST level (this action would only have been necessary if both of the operable RWST level channels were to fail).

Additionally, no other Unit 2 ECCS related components, trains, or systems were to have been removed from service for maintenance or testing during the time period that the NOED was in effect.

The NRC subsequently approved the NOED.

The first of the two failed RWST level channels was subsequently repaired and declared operable prior to the expiration of the original LCO time limit for Unit 2 to be in Mode 3. Therefore, the NOED was never actually utilized. The second of the two failed RWST level channels was subsequently repaired and declared operable shortly thereafter.

This event was of no significance with respect to the health and safety of the public.

ADDITIONAL INFORMATION

Within the last three years, no other LERs occurred at Catawba involving instrumentation channel failures resulting from lightning strikes.

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].

This event is considered reportable to the Equipment Performance and Information Exchange (EPIX) program.

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.

Catawba Nuclear Station LER 414/03-001-00 PIP C03-4566 Page 1 ENCLOSURE 1 Signature Sheet Prepared By:

X Date: Io/40 3 Reviewed By:

-- Date:

-(_____

1

%.1 Date:

0/5 Date:

Approved By:

X Date:

Date:

9 7&

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ENCLOSURES:

1. Regulatory Compliance Signature Sheet
2. References I
3. Corrective Action Schedule
4. Cause Code Summary
5. Personnel Contacted

Catawba Nuclear Station LER 414/03-001-00 PIP 03-4566 Page 2 ENCLOSURE 2 REFERENCES

1. PIP C-03-4566
2. Technical Specification Action Item Log
3. NUREG-1022 Rev 2, Event Reporting Guidelines 100FR 50.72 and 50.73
4. Letter from Duke Energy Corporation to NRC, dated August 18, 2003
5. Letter from NRC to Duke Energy Corporation, dated August 20, 2003 ENCLOSURE 3 CORRECTIVE ACTION SCHEDULE

Corrective Action

Person Person Due Date Contacted Assigned_

1 R.G.

R.G.

Neigenfin Neigenfind d

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ENCLOSURE 4 CAUSE CODE ASSIGNMENT SHEET CAUSE CODE:

Qlh -

Direct lightning strike ENCLOSURE 5 PERSONNEL CONTACTED

1. R.G. Neigenfind

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