05000324/LER-2016-004, Regarding Tornado Missile Vulnerability Results in Condition Prohibited by Technical Specifications

Regarding Tornado Missile Vulnerability Results in Condition Prohibited by Technical Specifications

ML16271A187
Person / Time
Site:	Brunswick
Issue date:	09/06/2016
From:	William Gideon Duke Energy Progress
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 16-004-00
Download: ML16271A187 (6)

LER-2016-004, Regarding Tornado Missile Vulnerability Results in Condition Prohibited by Technical Specifications

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation 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)(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)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i)
3242016004R00 - NRC Website

text

('->DUKE

~ ENERGY SEP 6 2010 Serial: BSEP 16-0071 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

Brunswick Steam Electric Plant, Unit Nos. 1 and 2 Renewed Facility Operating License Nos. DPR-71 and DPR-62 Docket Nos. 50-325 and 50-324 Licensee Event Report 1-2016-004 William R. Gideon Vice President Brunswick Nuclear Plant P.O. Box 10429 Southport, NC 28461 o: 910.457.3698 10 CFR 50.73 In accordance with the Code of Federal Regulations, Title 1 O, Part 50.73, Duke Energy Progress, Inc., submits the enclosed Licensee Event Report (LER). This report fulfills the requirement of 1 O CFR 50.73(a)(1) for a written report within sixty (60) days of a reportable occurrence.

Please refer any questions regarding this submittal to Mr. Lee Grzeck, Manager - Regulatory Affairs, at (910) 457-2487.

SWao William R. Gideon SWR/swr Enclosure: Licensee Event Report 1-2016-004

U.S. Nuclear Regulatory Commission Page 2 of 2 cc (with enclosure):

U.S. Nuclear Regulatory Commission, Region II ATTN: Ms. Catherine Haney, Regional Administrator 245 Peachtree Center Ave, NE, Suite 1200 Atlanta, GA 30303-1257 U.S. Nuclear Regulatory Commission ATTN: Ms. Michelle P. Catts, NRC Senior Resident Inspector 8470 River Road Southport, NC 28461-8869 U.S. Nuclear Regulatory Commission ATTN: Mr. Andrew Hon (Mail Stop OWFN 8G9A) (Electronic Copy Only) 11555 Rockville Pike Rockville, MD 20852-2738 Chair - North Carolina Utilities Commission (Electronic Copy Only) 432 S Mail Service Center Raleigh, NC 27699-4300 swatson@ncuc.net

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2018 (06*2016)

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 />.

,oJ>"~c..~~

Reported lessons learned are incorporated into the licensing process and fed back to industry.

~

LICENSEE EVENT REPORT (LEA)

Send comments regarding burden estimate to the FOIA. Privacy and Information Collections

~

~*

Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail

~

.I (See Page 2 for required number of digits/characters for each block) to lnfocollects.Resource@nrc.gov, and to the Desk Officer. Office of Information and Regulatory Affairs. NEOB-10202, (3150-0104). Office of Management and Budget, Washington, DC 20503. If a (See NUREG-1 022, R.3 for instruction and guidance for completing this fonm means used to impose an information collection does not display a currently valid OMB control htto://www.nrc.oov/readino-rm/doc-collections/nureas/staff/sr1022/r3D number, the NRG may not conduct or sponsor, and a person is not required to respond to, the information collection.

3. PAGE Brunswick Steam Electric Plant (BSEP) Unit 1 05000325 1 OF 4

4. TITLE Tornado Missile Vulnerability Results in Condition Prohibited by Technical Specifications

5. EVENT DATE

6. LEA NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED I

SEQUENTIAL I REV FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER NO.

MONTH DAY YEAR Brunswick Unit 2 05000324 FACILITY NAME DOCKET NUMBER 07 21 2016 2016 - 004

- 00 09 2016 05000

9. OPERATING MODE

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

D 20.2201 (bl D 20.2203(a)(3)(i)

D 50.73(a)(2)(ii)(A)

D 50.73(a)(2)(viii)(A) 1 D 20.2201 (d)

D 20.2203(a)(3)(ii)

D 50.73(a)(2)(ii)(B)

D 50.73(a)(2)(viii)(B)

D 20.2203(a)(1 l D 20.2203(a)(4)

D so.13(a)(2)(iiil D 50.73(a)(2)(ix)(A)

D 20.2203(a)(2)(il D 50.36(c)(1 )(i)(A)

D 50.73(a)(2)(iv)(A)

D 50.73(a)(2)(x)

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

D 50.36(c)(1 )(ii)(A)

D 50.73(a)(2)(v)(A)

D 13.11 (a)(4)

D 20.2203(a)(2)(iii)

D so.36(c)(2)

D 50.73(a)(2)(v)(B)

D 13.11 (a)(s)

D 20.2203(a)(2)(iv)

D so.46(a)(3)(ii)

D 50.73(a)(2)(v)(C)

D 13.11(a)(1 l 100 D 20.2203(a)(2)(v)

D 50.73(a)(2)(i)(A)

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

D 13.77(a)(2)(il D 20.2203(a)(2)(vi)

~

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

D 50.73(a)(2)(vii)

D 13.77(a)(2)(ii)

D 50.73(a)(2)(i)(C)

D OTHER Specify in Abstract below or in

Event Description

2. DOCKET NUMBER 05000-325 YEAR 2016 -

3. LER NUMBER SEQUENTIAL NUMBER 004 REV NO.

000 On July 21, 2016, Engineering personnel determined that a conduit associated with Unit 2 NSW pump "B" was vulnerable to a tornado missile. The affected pump was declared to be inoperable. Immediate compensatory actions were implemented in order to satisfy the conditions for enforcement discretion as set forth in Enforcement Guidance Memorandum (EGM) 15-002 and Interim Staff Guidance (ISG)

DSS-ISG-2016-01, Appendix A. With these actions in place, NSW pump 28 was then declared to be operable but nonconforming.

Event Causes The vulnerability of the control cables for Unit 2 NSW pump "B" to a tornado missile has existed since original plant construction.

Safety Assessment

The purpose of the NSW system is to provide cooling water for safety-related plant equipment such as the Emergency Diesel Generators [EK] and Emergency Core Cooling System pump seals and room coolers, and to-serve as the Ultimate Heat Sink for the plant. Two occasions in the past three years were identified in which a-required NSW pump w~s inoperable for greater than seven days, twelve hours. During this time, at least one NSW pump remained operable on each unit,.ensuring the safety function was met.

CSW pumps were also available and can be used to supply NSW headers on both units.

Per EGM 15-002, the NRC has analyzed risk generically for tornado-generated missiles. The analysis supports the characterization of the risk as of low significance.

Based on this analysis, this event had no adverse impact on the health and safety of the public.

Corrective Actions

In accordance with EGM 15-002 and Regulatory Issue Summary (RIS) 2015-06, the following compensatory measures have been implemented:

• Procedures were verified to be in place that address high winds, tornadoes, and the potential loss of equipment found to be vulnerable tq a tornado missile.

J

• Procedures were verified to be in place, and training either received or planned, for responding in the event that a tornado watch or warning is issued.

• Procedures and equipment were verified to be in place supporting Diverse and Flexible Coping Strategies (FLEX).

• The level of awareness by shift personnel was hei~htened by referencing the 2B NSW pump in shift turnover notes and the discussion of non-conforming conditions.

More comprehensive measures will be implemented within the 60-day period specified by EGM 15-002.

These actions will be in place by September 19, 2016.

SEQUENTIAL NUMBER 004 REV NO.

000 The above compensatory actions will remain in place until the tornado missile vulnerability is permanently eliminated. This will be completed within the time period specified by EGM 15-002 for plants designated as being in a region of higher tornado missile risk.

Previous Similar Events

No previous events have occurred in which a structure, system, or component has been found to be vulnerable to a tornado missile.

Commitments

This report contains no new regulatory commitments. Page _4_ of _4_