05000397/LER-2012-001, Regarding DG-3 Inoperable for Longer than Allowed by TS Due to Failed Governor

Regarding DG-3 Inoperable for Longer than Allowed by TS Due to Failed Governor

ML12031A193
Person / Time
Site:	Columbia
Issue date:	01/13/2012
From:	Sawatzke B Energy Northwest
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
G02-12-006 LER 12-001-00
Download: ML12031A193 (4)

LER-2012-001, Regarding DG-3 Inoperable for Longer than Allowed by TS Due to Failed Governor

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 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)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function
3972012001R00 - NRC Website

text

Bradley J. Sawatzke ENERGY Columbia Generating Station P.O. Box 968, PE08 Richland, WA 99352-0968 N ORTH W EST Ph. 509.377.43001 F. 509.377.4150 bjsawatzke @ energy-northwest.com January 13, 2012 G02-12-006 10 CFR 50.73 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

Subject:

COLUMBIA GENERATING STATION, DOCKET NO. 50-397 LICENSEE EVENT REPORT NO. 2012-001-00

Dear Sir or Madam:

Transmitted herewith is Licensee Event Report No. 2012-001-00 for Columbia Generating Station. This report is submitted pursuant to 10 CFR 50.73(a)(2)(i)(B).

There are no commitments being made to the NRC herein. If you have any questions or require additional information, please contact Mr. ZK Dunham at (509)377-4735.

Respectfully, BJ Sawatzke Vice President, Nuclear Generation & Chief NuclearOfficer

Enclosure:

Licensee Event Report 2012-001-00 cc: NRC Region IV Administrator NRC NRR Project Manager NRC Senior Resident Inspector/988C RN Sherman - BPA/1 399 WA Horin - Winston & Strawn

U.

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB NO. 3150-0104 EXPIRES 10/31/2013 (10-2010)

, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.

3. PAGE Columbia Generating Station 05000397 1 OF3

4. TITLE DG-3 Inoperable for Longer than Allowed by TS Due to Failed Governor

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE S. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REV FACILITY NAME DOCKET NUMBER NUMBER NO.

MONT YEAR 05000 FACILITY NAME DOCKET NUMBER 2

28 2010 2012 - 001 - 00 1

13 2012 05000

9. OPERATING MODE

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 1 20.2201(b)

El 20.2203(a)(3)(i)

El 50.73(a)(2)(i)(C)

El 50.73(a)(2)(vii) 20.2201(d) 0 20.2203(a)(3)(ii)

El 50.73(a)(2)(ii)(A)

El 50.73(a)(2)(viii)(A) 20.2203 (a)(1)

[] 20.2203(a)(4)

El 50.73(a)(2)(ii)(B)

El 50.73(a)(2)(viii)(B)

[] 20.2203(a)(2)(i) 0l 50.36(c)(1)(i)(A)

El 50.73(a)(2)(iii)

El 50.73(a)(2)(ix)(A)

10. POWER LEVEL El 20.2203(a)(2)(ii)

El 50.36(c)(1)(iI)(A)

El 50.73(a)(2)(iv)(A)

El 50.73(a)(2)(x) 100 0

20.2203(a)(2)(iii) 0l 50.36(c)(2)

El 50.73(a)(2)(v)(A) 0 73.71 (a)(4) 0l 20.2203(a)(2)(iv)

El 50.46(a)(3)(ii)

EJ 50.73(a)(2)(v)(B)

El 73.71 (a)(5)

El 20.2203(a)(2)(v)

El 50.73(a)(2)(i)(A)

El 50.73(a)(2)(v)(C)

El OTHER [3 20.2203(a)(2)(vi)

[

50.73(a)(2)(i)(B)

El 50.73(a)(2)(v)(D)

Specify in Abstract below or in

Immediate Corrective Actions

DG-3 was declared inoperable on February 28, 2010, the governor was replaced on March 2, 2010, surveillance testing was completed, and DG-3 was declared operable on March 4, 2010.

Causes

The direct cause of the event is believed to be related to foreign material left in the governor as early as 2005 and that the root cause of the event was organizational decision making did not adequately consider long term risks and consequences associated with operating the governor with known foreign material intrusion. However, additional factors such as wear due to aging, flushing the governor with fuel oil, and overfilling the governor could not be ruled out as contributors to the cause.

The RCE is under revision to consider other forensic analysis and a supplemental LER is planned.

Further Corrective Actions Further corrective actions included strengthening foreign material intrusion actions in operability determinations and maintenance procedures and providing training on lessons learned to the management committee responsible for station health issues.

The RCE is under revision and additional corrective actions are being taken to address failure to report within 60 days in accordance with 10 CFR 50.73.

Assessment of Safety Consequences

There were no actual safety consequences as a result of this condition. Critical electrical bus SM-4 [BU] is normally energized from Normal Auxiliary transformer TR-N1 [XFMR] thru non-critical bus SM-2 when the main generator [GEN] is operating and from Startup Auxiliary transformer TR-S thru SM-2 when the main generator is not operating. DG-3 provides emergency power to SM-4. SM-4 was available and powered by either TR-N1 or TR-S throughout the time frame DG-3 was postulated to be inoperable.

Similar Events

A search of CGS Licensee Event Reports and the Corrective Action Program for the last 10 years found no other instances where load oscillations were observed on an emergency diesel generator due to a failed governor.

Energy Industry Identification System (EIIS) Information EIIS information is denoted as [XX], [XXX], or [XXXX] throughout the narrative.

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