05000263/LER-2014-005, Regarding Appendix R Fire Door Failed to Latch
| ML14139A185 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 05/19/2014 |
| From: | Fili K Northern States Power Co, Xcel Energy |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-MT-14-039 LER 14-005-00 | |
| Download: ML14139A185 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 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 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition |
| 2632014005R00 - NRC Website | |
text
Xcel Energy@
May 19, 2014 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Monticello Nuclear Generating Plant Docket 50-263 Renewed Facility Operating License No. DPR-22 LER 2014-005 "Appendix R Fire Door Failed to Latch" A Licensee Event Report (LER) for this occurrence is enclosed.
Summary of Commitments Monticello Nuclear Generating Plant 2807 W County Road 75 Monticello, MN 55362 L-MT-14-039 10 CFR 50.73 This letter contains no new commitments and no revisions to existing commitments.
Karen D. Fili Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company-Minnesota Enclosure cc:
Regional Administrator, Region Ill, USNRC Project Manager, Monticello Nuclear Generating Plant, USNRC Resident Inspector, Monticello Nuclear Generating Plant, USNRC
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO; 3150-0104 EXPIRES: 0113112017 (02-2014)
Estimated burden per response to comply with this mandatory collection request: 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />.
.)r...)."!l.~lO(o<i'.oc l
\\
Reported lessons learned are incorporated into the licensing process and fed back to industry.
~
Send comments regarding burden estimate to the FOIA, Privacy and Information Collections
.. ~
.p LICENSEE EVENT REPORT (LER)
Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to lnfocollects.Resource@nrc.gov, and to the Desk Officer, Office of Information and (See Page 2 for required number of Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC digits/characters for each block) 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Monticello Nuclear Generating Plant 05000-263 1 OF 3
- 4. TITLE Appendix R Fire Door Failed to Latch
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED YEAR I SEQUENTIAL I REV FACILITY NAME DOCKET NUMBER MONTH DAY YEAR NUMBER NO.
MONTH DAY YEAR 05000 FACILITY NAME DOCKET NUMBER 03 20 2014 2014 -
005 - 00 05 19 2014 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
D 20.2201 (bl 0 20.2203(a)(3)(i) 0 50.73(a)(2)(i)(C)
D 50. 73(a)(2)(vii) 1 D 20.2201 (dl 0 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(A)
D 50.73(a)(2)(viii)(A) 0 20.2203(a)(1) 0 20.2203(a)(4) rgj 50. 73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B) 0 20.2203(a)(2)(i) 0 50.36(c)(1)(i)(A) 0 50.73(a)(2)(iii) 0 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL 0 20.2203(a)(2)(ii) 0 50.36(c)(1)(ii)(A) 0 50.73(a)(2)(iv)(A) 0 50.73(a)(2)(x) 0 20.2203(a)(2)(iii) 0 50.36(c)(2) 0 50.73(a)(2)(v)(A) 0 73.71(a)(4) 93%
0 20.2203(a)(2)(iv) 0 50.46(a)(3)(ii) 0 50.73(a)(2)(v)(B)
D 73.71 (a)(5) 0 20.2203(a)(2)(v) 0 50.73(a)(2)(i)(A) 0 50.73(a)(2)(v)(C)
D OTHER 0 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B) 0 50.73(a)(2)(v)(D)
Specify in Abstract below or in
EVENT DESCRIPTION
On March 20, 2014, the Monticello Nuclear Generating Plant was in Mode 1 at approximately 93% power.
At 1020 hours0.0118 days <br />0.283 hours <br />0.00169 weeks <br />3.8811e-4 months <br />, during performance of the semi-annual fire door inspection, door-41 08 [DR] did not automatically close and latch as required, as a result of insufficient closing force. Door-41 08 is an Appendix R fire door that is required for divisional separation of safe shutdown equipment, specifically reactor level instrumentation. In this condition, divisional separation could not be assured in the event of a fire. A continuous fire watch was established and repairs were made.
At approximately 1135 hours0.0131 days <br />0.315 hours <br />0.00188 weeks <br />4.318675e-4 months <br />, door-41 08 repair was completed by lubrication of the door latch and adjusting the door closer. The door was then satisfactorily tested and declared functional. Therefore, the door was non-functional for approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 15 minutes.
There were no other structures, systems, or components inoperable at the start of the event that contributed to the event. Door-41 08 also has a High Energy Line Break function which is to remain open; this function was not compromised during this event.
EVENT ANALYSIS
The condition is reportable to the NRC in accordance with 10 CFR 50.73(a)(2)(ii)(B) for placing the plant in an unanalyzed condition that significantly degrades plant safety. The condition was reported to the NRC on March 20, 2014, in event notification 49938 in accordance with 10 CFR 50.72(b)(3)(ii)(B).
SAFETY SIGNIFICANCE
The Appendix R specified function for door-41 08 is to close and latch during a fire event to provide divisional separation. Door-41 08 is normally open and is designed to close in the event of a fire to create a fire barrier between the east and west side of the reactor building. The door was satisfactorily tested during the previous semi-annual fire door inspection on September 18, 2013.
Since the last successful testing of the door's closing function, the fire detection systems and manual suppression capability for the impacted fire zones have been functional with no fire impairments issued.
The fire detection system alarms in the Main Control Room which would result in prompt fire brigade response and fire extinguishment. Manual suppression capability consists of fire hose stations and extinguishers.
CAUSE
The cause of door-41 08 failure to close and latch during performance of the surveillance was determined to be insufficient closing force.
CORRECTIVE ACTION
Immediate corrective actions were to repair door-41 08 by adjusting the door closer and lubrication of the door latch. The door was then satisfactorily tested and declared functional. Long term corrective actions include door closer force adjustments on a periodic basis.
PREVIOUS SIMILAR EVENTS
There were no previous similar licensee event reports in the past three years. On March 22, 2010, door-41 08 did not automatically latch during performance of fire door inspections and was declared non-functional. The door closer was adjusted and the door was returned to functional status.
ADDITIONAL INFORMATION
Door manufacturer: WM. J. Perkinson Co., INC 3