05000341/LER-2016-007, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather

Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather

ML16295A109
Person / Time
Site:	Fermi
Issue date:	10/20/2016
From:	Polson K DTE Electric Company
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC-16-0065 LER 16-007-00
Download: ML16295A109 (5)

LER-2016-007, Regarding Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function 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)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)()
3412016007R00 - NRC Website

text

Keith J. Poison Site Vice President DTE Energy Company 6400 N. Dixie Highway, Newport, MI 48166 Tel: 734.586.4849 Fax: 734.586.4172 Email: keith.polson@dteenergy.com DTE Energy-10 CFR 50.73 October 20, 2016 NRC-16-0065 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001

Reference:

Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43

Subject:

Licensee Event Report (LER) No. 2016-007 Pursuant to 10 CFR 50.73(a)(2)(v)(C), DTE Electric Company (DTE) is submitting LER No. 2016-007, Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather.

No new commitments are being made in this LER.

Should you have any questions or require additional information, please contact Mr. Scott A. Maglio, Manager -Nuclear Licensing, at (734) 586-5076.

Sincerely, Keith J. Polson Site Vice President

Enclosure:

Licensee Event Report No. 2016-007, Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather cc: NRC Project Manager NRC Resident Office Reactor Projects Chief, Branch 5, Region III Regional Administrator, Region III Michigan Public Service Commission Regulated Energy Division (kindschl@michigan.gov)

Enclosure to NRC-16-0065 Fermi 2 NRC Docket No. 50-341 Operating License No. NPF-43 Licensee Event Report (LER) No. 2016-007, Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10131/2018 (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 />.

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

• C S

E E R P T

Send comments regarding burden estimate to the FOIA, Privacy and Information Collections LICENSEE EVENT RE T (LER)

Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail x " 3t/

(See Page 2 for required number of digits/characters for each block) to Infocollects.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-1022, R.3 for instruction and guidance for completing this form means used to impose an information collection does not display a currently valid OMB control http;//www nrcgov/reading-rm/doc-collections/nuregsLaff/Sr102.2/3/)

number, the NRC may not conduct or sponsor, and a person is not required to respond to, the b~ip// rc.ov/eadng-rn/oc-oilelios/n~eg/Sttf/rl 22/~i) information collection.

3. PAGE Fermi 2 05000 341 1 OF 3

4. TITLE Secondary Containment Pressure Exceeded Technical Specification Due to Adverse Weather

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED VEUMOATHVFACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SUE A Rv MONTH DAY YEAR N/A 05000 FACIUTY NAME DOCKET NUMBER 08 27 2016 2016 -

007 00 10 20 2016 N/A 05000

9. OPERATING MODE

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

[

20.2203(a)(3)(i) 50.73(a)(2)(ii)(A) 50.73(a)(2)(viii)(A)

E] 20.2201(d)

Q 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B)

Fl 20.2203(a)(1) 20.2203(a)(4) 50.73(a)(2)(iii)

E] 50.73(a)(2)(ix)(A)

Q 20.2203(a)(2)(i) 50.36(c)(1)(i)(A) 50.73(a)(2)(iv)(A)

El 50.73(a)(2)(x)

10. POWER LEVEL

[

20.2203(a)(2)(ii)

[]

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

] 50.73(a)(2)(v)(A)

E 73.71(a)(4) 20.2203(a)(2)(iii)

El 50.36(c)(2) 50.73(a)(2)(v)(B) 73.71(a)(5)

[

20.2203(a)(2)(iv) 50.46(a)(3)(ii)

/

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

E 73.77(a)(1) 53 20.2203(a)(2)(v) 50.73(a)(2)(i)(A)

[

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

F] 73.77(a)(2)(i) 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(vii)

] 73.77(a)(2)(ii) 50.73(a)(2)()(C)

OTHER Specify in Abstract below or in If the DBA LOCA for SC concurrent with a Loss of Offsite Power had occurred during the times when the SC pressure TS limit was exceeded, the SC was sufficiently leak tight such that the SGTS would still have established and maintained vacuum greater than the TS required value.

The radiological consequences of the DBA LOCA for SC contained in Chapter 15 of the Fermi 2 UFSAR result in doses that are below 10 CFR 50.67. The SC is assumed to be at 0.125 inch vacuum water gauge at the onset of the LOCA. For this particular event, had the DBA LOCA for SC actually occurred, the increase in magnitude of radiological dose as a result of increased draw-down time from the highest recorded pressure of 0.05 inch water gauge vice -0.125 inch water gauge for 1 second, would be minimal and negated by several very conservative assumptions in the existing analysis (e.g., 100 percent exfiltration from SC during the first 15 minutes of drawdown with SGTS in operation, 10%

exfiltration from SC with SGTS in operation throughout the remaining 30 day duration of the accident, no holdup time in SC throughout the 30 day duration of the accident, and all exfiltration and filtered releases are at ground level).

CAUSE OF THE EVENT

The effect of the high winds outside of the RB caused the momentary loss of SC.

The high winds outside the RB are known to cause large and rapid changes in RB differential pressure (i.e. between inside and outside the RB). There are two divisions to monitor SC pressure. Each division has four pressure transmitters

((PT)) located on the RB fifth floor, one on each of the four RB walls, with a pressure probe that penetrates the wall to the outside, and a recorder. The recorder indicates the highest pressure of the four inputs from the transmitters. Using the equation provided in Section 6.2 of the Fermi 2 UFSAR, wind speeds of 30 to 60 miles per hour (mph) on the RB result in an external pressure change of -0.27 to -1.07 inch water gauge on the leeward side of the building. The negative change on the leeward side of the building results in a lower RB differential pressure. As a result, high wind gusts are sufficient to cause momentary loss of SC even with no other contributing causes.

CORRECTIVE ACTIONS

No corrective actions were required to restore compliance with the Technical Specification requirement.

Fermi 2 plans to adopt Technical Specification Task Force Traveler (TSTF) 551, "Revise Secondary Containment Surveillance Requirements," if it is approved by the U.S. Nuclear Regulatory Commission. This TSTF would eliminate the need to declare SC inoperable due to momentary pressure indications exceeding the TS limit, such as may be caused by wind gusts as described in this LER.

PREVIOUS OCCURRENCES

Similar events involving loss of SC due solely to high winds have been reported in the following LERs:

LER 2016-003 involved the loss of SC due to high winds on July 8, 2016.

LER 2016-004 involved the loss of SC due to high winds on July 13, 2016.

The corrective actions for the above events were not complete prior to the August 27, 2016 event reported in this LER due to the short timeframe between the events and therefore were not able to prevent occurrence of this event.Page 3

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