05000530/LER-2020-001, Condition Prohibited by Technical Specifications Due to Inoperable Spray Pond Pump

Condition Prohibited by Technical Specifications Due to Inoperable Spray Pond Pump

ML20120A607
Person / Time
Site:	Palo Verde
Issue date:	04/24/2020
From:	Rash B Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-08081-BR/LMW LER 2020-001-00
Download: ML20120A607 (5)

LER-2020-001, Condition Prohibited by Technical Specifications Due to Inoperable Spray Pond Pump

Event date:
Report date:
Reporting criterion:	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)(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)
5302020001R00 - NRC Website

text

10 CFR 50.73 A member of the STARS Alliance LLC Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek BRUCE J. RASH Vice President Nuclear Engineering/Regulatory Palo Verde Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel 623 393 6491 102-08081-BR/LMW April 24, 2020 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Unit 3 Docket No. STN 50-530 / License No. NPF 74 Licensee Event Report 2020-001-00 Enclosed please find Licensee Event Report (LER) 50-530/2020-001-00 that has been prepared and submitted pursuant to 10 CFR 50.73. This LER reports a Condition Prohibited by Technical Specifications.

In accordance with 10 CFR 50.4, copies of this LER are being forwarded to the Nuclear Regulatory Commission (NRC) Regional Office, NRC Region IV, and the Senior Resident Inspector.

Arizona Public Service Company makes no commitments in this letter. If you have questions regarding this submittal, please contact Matthew Kura, Department Leader, Nuclear Regulatory Affairs, at (623) 393-5379.

Sincerely, BR/LMW Enclosure cc:

S. A. Morris NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS C. A. Peabody NRC Senior Resident Inspector PVNGS Rash, Bruce (Z77439)

Digitally signed by Rash, Bruce (Z77439)

DN: cn=Rash, Bruce (Z77439)

Date: 2020.04.24 13:35:28

- 07'00'

NRC FORM 366 (04-2020)

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: 04/30/2020

NRC FORM 366 (04-2020) 05000

3. Page 1

OF

4. Title

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.

The drive pawl pin and drive pawl lever are part of the breaker charging operation. As with the event in this LER, an upgraded part (pawl assembly) was recommended in GE SAL 352.1 for replacement, but that replacement was not performed on PVNGS equipment.

Two additional events were related to the failure of a microswitch that had an updated vendor recommendation per GE SAL 361.1 from 2007. The first event occurred on November 1, 2018, when the Unit 3 Train A SP pump failed to start automatically during a DG operability test. The second event occurred on July 17, 2019, when the Unit 1 Train B High Pressure Safety Injection (HPSI) breaker closing springs failed to charge during testing. GE SAL 361.1 updated the design of the old-style closed switch to a new-style open switch. Implementation of this SAL was limited, due to the assessment that the new-style open switch was more vulnerable to foreign material than the old-style closed switch.

The event evaluation for the 2018 Unit 3 Train A SP event found that the microswitch had failed after approximately six months of use due to excessive oxidation on the contact surfaces. The failed switch was the old-style closed switch. This evaluation concluded that a contributing cause to this event was failure to implement recommendations from the vendor on unreliable parts. Corrective actions were implemented for this event including performing the necessary procedure changes to allow the installation of the new-style open switch.

The event evaluation for the 2019 Unit 1 HPSI Train B breaker failure identified that a contributing cause to the event was the untimely implementation of the GE SAL 361.1 recommendation to replace the old-style closed switch with the new-style open design. Corrective actions from this event included a replacement of all old-style closed switches with new-style open switches at the earliest allowable work window, depending upon part availability.

The corrective actions for these similar events did not prevent the failure of the breaker identified in this LER because no corrective actions were prescribed that resulted in the replacement of the cast-iron square bushing addressed by the recommendation of SAL 352.1.

4 4

Palo Verde Nuclear Generating Station (PVNGS) Unit 3 530 2020 001 00