05000414/LER-2019-004, Condition Prohibited by Technical Specification and Loss of Safety Function Due to Refueling Water Storage Tank Volume Below the Minimum Requirement
| ML19290G728 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 10/17/2019 |
| From: | Simril T Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-19-0405 LER 2019-004-00 | |
| Download: ML19290G728 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 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)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(x) |
| 4142019004R00 - NRC Website | |
text
J_., DUKE
~ ENERGY RA-19-0405 October 17, 2019 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555
Subject:
Duke Energy Carolinas, LLC Catawba Nuclear Station, Unit 2 Docket No. 50-414 Licensee Event Report (LER) 414/2019-004-00 Tom Simril Vice President Catawba Nuclear Station Duke Energy CN01VP I 4800 Concord Road York, SC 29745 o: 803.701.3340 f: 803.701.3221 10 CFR 50.73 Pursuant to 10 CFR 50.73(a)(1) and (d), attached is LER 414/2019-004-00, entitled "Condition Prohibited by Technical Specification and Loss of Safety Function due to Refueling Water Storage Tank Volume Below the Minimum Requirement."
This report is being submitted in accordance with 10 CFR 50.73(a)(2)(i)(B) and 1 O CFR
- 50. 73(a)(2)(v)(A), (B), and (D).
There are no regulatory commitments contained in this letter or its attachment.
This event is considered to be of no significance with respect to the health and safety of the public.
If questions arise regarding this LER, please contact Sherry E. Andrews of Regulatory Affairs at (803) 701-3424.
Sincerely, Tom Simril Vice President, Catawba Nuclear Station Attachment
United States Nuclear Regulatory Commission Page 2 October 17, 2019 xc (with attachment):
L. Dudes Regional Administrator U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, GA 30303 M. Mahoney NRC Project Manager (CNS)
U.S. Nuclear Regulatory Commission 11555 Rockville Pike Mailstop O-8G9A Rockville, MD 20852 J. Austin NRC Senior Resident Inspector
NRC FORM 366 (04-2018)
U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT (LER)
(See Page 2 for required number of digits/characters for each block)
(See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1022/r3/)
APPROVED BY OMB: NO. 3150-0104 EXPIRES: 03/31/2020
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
NRC FORM 366 (04-2018) 05000
- 3. Page 1
OF
- 5. Event Date Month Day Year
- 6. LER Number Year Sequential Number Rev No.
- 7. Report Date Month Day Year
- 8. Other Facilities Involved Facility Name Docket Number 05000 Facility Name Docket Number 05000
- 9. Operating Mode
- 10. Power Level
- 11. This Report is Submitted Pursuant to the Requirements of 10 CFR §: (Check all that apply) 20.2201(b) 20.2201(d) 20.2203(a)(1) 20.2203(a)(2)(i) 20.2203(a)(2)(ii) 20.2203(a)(2)(iii) 20.2203(a)(2)(iv) 20.2203(a)(2)(v) 20.2203(a)(2)(vi) 20.2203(a)(3)(i) 20.2203(a)(3)(ii) 20.2203(a)(4) 50.36(c)(1)(i)(A) 50.36(c)(1)(ii)(A) 50.36(c)(2) 50.46(a)(3)(ii) 50.73(a)(2)(i)(A) 50.73(a)(2)(i)(B) 50.73(a)(2)(i)(C) 50.73(a)(2)(ii)(A) 50.73(a)(2)(ii)(B) 50.73(a)(2)(iii) 50.73(a)(2)(iv)(A) 50.73(a)(2)(v)(A) 50.73(a)(2)(v)(B) 50.73(a)(2)(v)(C) 50.73(a)(2)(v)(D) 50.73(a)(2)(vii) 50.73(a)(2)(viii)(A) 50.73(a)(2)(viii)(B) 50.73(a)(2)(ix)(A) 50.73(a)(2)(x) 73.71(a)(4) 73.71(a)(5) 73.77(a)(1) 73.77(a)(2)(i) 73.77(a)(2)(ii)
Other (Specify in Abstract below or in Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
Complete a Performance Analysis regarding operator knowledge of the RWST NR and WR level instrumentation, their outputs, the relationship between each indication, and the RWST at makeup annunciator - Complete Planned Operations identify equipment deficiencies related to TS equipment/indications on turnover sheets through the formal evaluation process to ensure impacts are understood, including any lost margin; the correct monitoring and contingency actions are in place; the priority for repairs are appropriate, and the issue is effectively communicated within the department and to the site.
SAFETY ANALYSIS
After the event occurred, a functional test was performed that verified both Unit 2 RWST NR transmitter instrument loops and annunciators were functional. The RWST Makeup Level annunciator is set at a value which is sufficient to ensure timely makeup can be provided such that volume can be maintained above the TS minimum volume. The Unit 2 RWST Makeup Level annunciator was not received during this event.
As-found channel calibration performance was also analyzed during the recent Unit 2 outage. Based on the functional testing performed coupled with the as-found channel calibration performance, and the fact that a Makeup Level annunciator was not received during the event, it is concluded that the Unit 2 RWST contained more than the minimum required volume. Therefore, the Unit 2 RWST could have still performed its intended safety function with the level in the tank.
In conclusion, this event is considered to be of low safety significance. There was no impact to the health and safety of the public.
ADDITIONAL INFORMATION
Previous Similar Occurrences:
A review of License Event Reports from the past 5 years did not identify any similar occurrences.
5 5
Catawba Nuclear Station, Unit 2 414 2019 004 0