05000250/LER-2020-005, Technical Specification Action Not Taken for Unrecognized Inoperable Source Range Channel
| ML20289A294 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/14/2020 |
| From: | Pearce M Florida Power & Light Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-2020-151 LER 2020-005-00 | |
| Download: ML20289A294 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 2502020005R00 - NRC Website | |
text
U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 RE: Turkey Point Unit 3 Docket No. 50-250 Repotiable Event: 2020-005-00 Date of Event: August 19, 2020 10 CFR 50.73 L-2020-151 October 14, 2020 Title: Technical Specification Action Not Taken for Unrecognized Inoperable Source Range Channel The attached Licensee Event Report 05000250/2020-005-00 is submitted pursuant to l O CPR 50.73 (a)(2)(i)(B) for a condition that was prohibited by plant Technical Specifications.
If there are any questions, please call Mr. Robert Hess at 305-246-4112 or e-mail Robert.Hess@fpl.com.
Sincerely, Michael Pearce Site Vice President - Turkey Point Nuclear Plant Florida Power & Light Company Attachments: USNRC Forms 366 and 366A, current revision cc: USNRC Senior Resident Inspector, Turkey Point Plant USNRC Regional Administrator, Region II Florida Power & Light Company 9760 SW 344th St., Homestead, FL 33035
Abstract
Turkey Point Unit 3 250 3
Technical Specification Action Not Taken for Unrecognized Inoperable Source Range Channel 08 19 2020 2020 005 00 10 14 2020 2
000
David Stoia - Licensing Engineer (305) 246-6538 B
IG DET Yes
On 8/19/2020 during a reactor startup, a disparity was observed between the indicated values of both primary Source Range channels. A prompt investigation determined that one of the two Source Range channels was not indicating properly and that it was inoperable. A subsequent Past Operability Review concluded that the malfunctioning Source Range channel was inoperable from 4/1/2020 until it was repaired and declared operable on 8/24/2020. During this period Unit 3 had performed a total of three (3) reactor power manipulations when Technical Specifications required two Source Range channels to be operable. Since the status of the inoperable Source Range channel was unrecognized, actions prescribed by the applicable Technical Specification were not taken.
This condition is reportable pursuant to 10 CFR 50.73 (a)(2)(i)(B) for a condition that was prohibited by plant Technical Specifications.
~~--~-
\\ ~)
I ID Page of 05000-
- 3. LER NUMBER YEAR SEQUENTIAL NUMBER REV NO.
CAUSE
The cause of the deficiency associated with N-3-32 is under investigation in the station's Corrective Action Program.
SAFETY SIGNIFICANCE
The safety significance of the condition described in this report is low. Source Range functions are not modeled in the plant Probability Risk Assessment. Multiple, redundant trip features are described in the UFSAR Ch 14 Accident Analysis for the postulated control rod withdrawal event. During normal power operation the Source Range channels are not required for service and are deenergized. While N-3-32 was inoperable during reactor startups, N-3-31 was available to generate a reactor trip signal. During refueling operations while N-3-32 was inoperable, TS requirements were met based on operability of N-3-31 and the backup Source Range channels. The cumulative time that a TSAS was applicable and not administered because the status of N-3-32 was unrecognized is small compared to the total time that N-3-32 was inoperable.
CORRECTIVE ACTIONS
Corrective maintenance was performed on N-3-32. N-3-32 was declared operable on 8/24/20 at 06:05 hours.
ADDITIONAL INFORMATION
EIIS Codes are shown in the format [IEEE system identifier, component function identifier, second component function identifier (if appropriate)].
SIMILAR EVENTS
A review of Turkey Point reportable events over the previous 15 years was performed to identify potentially similar events or patterns. No events were identified that involved extended or unrecognized inoperability of a Source Range detector.
No pattern characterized by the equipment issue described in this report was identified.
3 3
Turkey Point Unit 3 250 2020 005 00 r;;)"a ll("Ot,<,t
.. ~
"h,.,
i
=
i..,.,
.. ~"
- f!*
I I
I I I I D