05000298/LER-1917-004, Regarding Torus to Drywall Vacuum Breaker Failure to Indicate Full Closed Causes Loss of Safety Function
| ML17236A167 | |
| Person / Time | |
|---|---|
| Site: | Cooper  (DPR-046) |
| Issue date: | 08/17/2017 |
| From: | Dent J Nebraska Public Power District (NPPD) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NLS2017076 LER 17-004-00 | |
| Download: ML17236A167 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 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)(ii) 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), Loss of Safety Function 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) |
| 2981917004R00 - NRC Website | |
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H Nebraska Public Power District Always theTe when you need us NLS2017076 August 17, 2017 U.S. Nuclear Regulatory Commission
- Attention: Document Control Desk Washington, D.C. 20555-0001
Subject:
Licensee Event Report No. 2017-004-00 Cooper Nuclear Station, Docket No. 50-298, DPR-46
Dear Sir or Madam:
The purpose of this correspondence is to forward Licensee Event Report 2017-004-00.
There are no new commitments contained in this letter.
Sincerely,
- John Dent, Jr.
Vice President Nuclear-Chief Nuclear Officer
/jo Attachment: Licensee Event Report 2017-004-00 cc:
Regional Administrator w/attachment USNRC - Region IV Cooper Project Manager w/attachment USNRC - NRR Plant Licensing Branch IV Senior Resident Inspector w/attachment USNRC-CNS SRAB Admit1istrator w/attachment COOPER NUCLEAR STATION NPG Distribution w/attachment INPO Records Center w/attachment via ICES entry SORC Chairman w/attachment CNS Records w/attachment P.O. Box 98 /Brownville, NE 68327-0098 Telephone: (402) 825-3871 /Fax: (402) 825-5277 www.nppd.com
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BYOMB: NO. 3150-0104 EXPIRES: 03/31/2020 (04-2017)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Cooper Nuclear Station 05000298 1of3
- 4. TITLE Torus to Drywall Vacuum Breaker Failure to Indicate Full Closed Causes Loss of Safety Function
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED YEAR ISEQUENTIALI REV FACILITY NAME DOCKET MONTH DAY YEAR NO.
MONTH DAY YEAR 05000 NUMBER FACILITY NAME DOCKET 06 19 17 2017 -
004 -
00 08 17 2017 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
D 20.2201(b)
D 20.2203(a)(3)(i) 0 50.73(a)(2)(ii)(A)
D 50.73(a)(2)(viii)(A) 1 D 20.2201(d)
D 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(B)
D 50.73(a)(2)(viii)(B)
D 20.2203(a)(1)
D 20.2203(a)(4)
D 50.73(a)(2)(ii) 0 50. 73(a)(2)(ix)(A)
D 20.2203(a)(2)(i) 0 50.36(c)(1 )(i)(A) 0 50. 73(a)(2)(iv)(A)
D 50.73(a)(2)(x)
D 20.2203(a)(2)(ii) 0 50.36(c)(1 )(ii)(A) 0 50.73(a)(2)(v)(A)
D 73.71(a)(4)
- 10. POWER LEVEL D 20.2203(a)(2)(iii)
D 50.36(c)(2) 0 50. 73(a)(2)(v)(B)
D 73.71(a)(5) 0 20.2203(a)(2)(iv)
D 50.46(a)(3)(ii)
D 50.73(a)(2)(v)(C)
D 73.77(a)(1) 100 0 20.2203(a)(2)(v) 0 50. 73(a)(2)(i)(A)
[gl 50.73(a)(2)(v)(D)
D 73.77(a)(2)(i)
D 20.2203(a)(2)(vi)
D 50.73(a)(2)(i)(B) 0 50.73(a)(2)(vii)
D 73.77(a)(2)(ii) 0 50.73(a)(2)(i)(C) 0 OTHER Specify in Abstract below or in
- 3. LER NUMBER SEQUENTIAL NUMBER
- - 004 REV NO.
- - 00 The control switch for PC-AOV-NRV21 was cycled open, then closed a second time. At this time, PC-AOV-NRV21 indicated closed. Operations declared primary containment operable at 23:11 hours and exited TS LCO 3.6.1.1, Condition A and Condition B, and TS LCO 3.6.1.8 Condition B.
The event is currently under investigation. CNS will provide additional event details, the safety significance, cause, corrective actions, and previous events in a supplement to this Licensee Event Report.
BASIS FOR REPORT CNS is reporting this event under 10 CFR 50.73(a)(2)(v)(D) as a condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.
CNS also reported this event to the Nuclear Regulatory Commission Operations Center per Event Notification 52813.
CNS subsequently performed an engineering evaluation which concluded that PC-AOV-NRV21 would have completed its closure under forces resulting from reactor blowdown. As such, this event is not considered a Safety System Functional Failure.
Other criteria, if determined to be applicable, will be provided in the supplemental report. Page 3 of3