05000416/LER-2018-001-01, Grand Gulf. Nuclear Station, Unit 1, Reactor Manual Shutdown Due to Turbine Pressure Control Valve Position Changes

Grand Gulf. Nuclear Station, Unit 1, Reactor Manual Shutdown Due to Turbine Pressure Control Valve Position Changes

ML19219B328
Person / Time
Site:	Grand Gulf
Issue date:	08/07/2019
From:	Emily Larson Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2019/00035 LER 2018-001-01
Download: ML19219B328 (5)

LER-2018-001, Grand Gulf. Nuclear Station, Unit 1, Reactor Manual Shutdown Due to Turbine Pressure Control Valve Position Changes

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)(viii)(B) 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
4162018001R01 - NRC Website

text

~Entergy.

GNR0-2019/00035 August 7,.2019 U.S. Nuclear Regulatory Commiss.ion Attn: Document Control Desk Washington, DC 20555-0001 Entergy Operations, Inc.

P. 0. Box756 Port Gibson, MS 39150 Eric A. Larson Site Vice Presid~nt Grand Gulf Nuclear Station Tel. (601) 437-7500 10CFR50.73

SUBJECT:

Supplemental Licensee Event Report 201'8-001-01, Reactor Manual Shutdown due to Turbine Pressure ControlValve Position Changes Grand Gulf. Nuclear Station, Unit 1 Docket No.. 50-416 License No. NPF-29

Dear Sir or Madam:

Attached is Supplemental Licensee E.vent Report 2018-001-01, Reactor Manual Shutdown due to Turbi'ne Pressure Control Valve Changes. This report is being: submitted in accordance with 10CFR50.73(a){2)(iv)(A) for any event or condition that resulted in a manual or automatic actuation of any of the systems listed in 1 OCFR50. 73(a)(2)(iv)(B).

This letter contains no new commitments. If you have any questions or require additional information, please contact Jim Shaw at 601-437-2103.

Sincerely, r0L Eric A. Larson EAL/rtw At~achment:

cc:

Supplemental Licensee Event Report 2018-001-01 NRC Region IV - Regional Administrator NRC Senior Resident Inspector, Grand Gulf Nuclear Station NRR Project Manager

GNR0-2019/00035 Attachment Supplemental Licensee Event Report 2018-001-01

NRC FORM 366

{04-2018)

U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 03/31/2020 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/readinq-rm/doc-collections/nuregs/staff/sr1022/r3l)

, the NRG may not conduct or sponsor, and a person is not reauired to resoond to the information collection.

~.Page Grand Gulf Nuclear Station, Unit 1 05000416 1 OF3

4. Title Reactor Manual Shutdown Due to Turbine Pressure Control Valve Position Chanaes

5. Event Date

6. LER Number

7. Report Date

8. Other Facilities Involved Docket Number Sequential Rev Facility Name Month Day Year Year Number No.

Month Day Year N/A 05000 N/A 01 30 2018 2018 001 01 08 07 2019 Facility Name N/A Docket Number 05000 N/A

9. Operating Mode

11. This Report is Submitted Pursuant to the Requirements of 1 O CFR §: (Check all that apply)

MODE1 D 20.2201 (b}

D 20.2203(a)(3)(i)

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

D 50.73(a)(2)(viii)(A)

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)

D 20.2203(a)(4)

D 50. 73(g}(2)(iii)

D 50. 73(a)(2)(ix)(A)

D 20.2203(a)(2)(i)

D 50.36(c)(1 )(i)(A)

[8] 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 73.71 (a)(4)

D 20.2203(a)(2)(iii)

D 50.36(c)(2)

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

D 73. 11 (a)(5) 91 °k D 20.2203(a)(2)(iv)

D 50.46(a)(3)(ii)

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

D 73.77(a)(1)

D 20.2203(a)(2)(v)

D 50. 73(a)(2)(i)(A)

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

D 73. 77(a)(2)(ii)

D 20.2203(a}(2}(vi)

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

D 50.73(a)(2)(vii)

D 73.77(a)(2)(iii)

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

D Other (Specify in Abstract below or in

• E.

CORRECTIVE ACTIONS

The. following corrective actions are completed or planned.

Completed:

The main.steam line resonance compensator circuit was recalibrated.

YEAR 2018

3. LER NUMBER SEQUENTIAL NUMBER

- 001 Work instructions to setup steam line compensator were revised to provide corrected work steps.

F.

SAFETY SIGNIFICANCE

The safety significance of this event is low because*au systems operated as designed and the TCV changes did not challenge any safety parameters. The manual scram was performed as a conservative measure. There w'ere no actual nuclear safety consequences or radiological consequences during the event.

G. PREVIOUS SIMILAR EVENTS

Entergy conducted a three-year review of the relevant licensee event reports and determined that there was*one similar known event reported as GGNS Licensee Event Report 2016-05-00 "Automatic Reactor SCRAM." The failure in that event was a failed amplifier card, which is different from this event which was an incorrect potentiometer setting. Therefore, the corrective actions for the previous event would not have prevented this event. Page 3 of 3 REV NO.

1

• 001