ML18106A647

LER 98-011-00:on 980505,improper Isolation of Single Cell Battery Charger from 125 Vdc Battery Was Noted.Caused by Inadequate 10CFR50.59 Applicability Review.Placed Procedure SC.MD-CM.ZZ-0024(Q) on Administrative hold.W/980604 Ltr

ML18106A647
Person / Time
Site:	Salem
Issue date:	06/04/1998
From:	Bakken A, Bernard Thomas Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-98-011, LER-98-11, LR-N980269, NUDOCS 9806120031
Download: ML18106A647 (5)

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A Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit JUN 04 1998 LR-N980269 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 LER 272/98-011-00 SALEM GENERATING STATION - UNIT 1 FACILITY OPERATING LICENSE NO. DPR-70 DOCKET NO. 50-272 Gentlemen:

This Licensee Event Report entitled "Improper Isolation of the Single Cell Battery Charger from the 125 VDC Battery" is being submitted pursuant to the requirements of the Code of Federal Regulations 1OCFR50.73(a)(2)(i)(B).

Sincerely, I- p ~ .(;, 11.c. 8.*i-...pz:

A C. Bakken Ill.

General Manager -

Salem Operations

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c Distribution LER . File r

3.7 9806120031 980604 PDR ADOCK 05000272 S PDR The prnYer is in yuur Jund:;.

95-2168 REV. 6/94

NRCFORM 366 U.S. NUCt.: REGULATORY COMMISSION APP VED BY OMB NO. 3150-0104 (4-95) EXPIRES 04/30/98 ESTIMATED BURDEN PER RESPONSE TO COMPLY WITH THIS MANDATORY INFORMATION COLLECTION REQUEST: 50.0 HRS.

REPORTED LESSONS LEARNED ARE INCORPORATED INTO THE LICENSEE EVENT REPORT (LER) LICENSING PROCESS AND FED BACK TO INDUSTRY. FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO THE INFORMATION AND RECORDS MANAGEMENT BRANCH (T-6 F33), U.S. NUCLEAR (See reverse for required number of REGULATORY COMMISSION, WASHINGTON, DC 20555--0001, AND TO THE PAPERWORK REDUCTION PROJECT (3150--0104), OFFICE OF digits/characters for each block) MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.

FACILITY NAME (1) DOCKET NUMBER (2) PAGE (3)

SALEM GENERATING STATION UNIT 1 05000272 1 OF4 TITLE (4)

Improper Isolation of the Single Cell Battery Charger from the 125 voe Battery EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED (8)

FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL I REVISION MONTH DAY YEAR NUMBER NUMBER I SALEM UNIT 2 05000311 05 05 98 98 -- 011 -- 00 06 04 98 FACILITY NAME HOPE CREEK DOCKET NUMBER 05000354

- -* .NG 1 THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check one or more) (11)

MODE(9) 20.2201(b) 20.2203(a)(2)(v) x 50. 73(a)(2)(i) 50. 73(a)(2)(viii)

POWER 100 20.2203(a)(1) 20.2203(a)(3)(i) 50. 73(a)(2)(ii) 50.73(a)(2)(x)

LEVEL (10) 20.2203(a)(2)(i) 20.2203(a)(3)(ii) 50. 73(a)(2)(iii) 73.71

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20.2203(a)(2)(ii) 20.2203(a)(4) 50.73(a)(2)(iv) OTHER 20.2203(a)(2)(iii) 50.36(c)(1) 50. 73(a)(2)(v) Spec~in Abstract below or in C Form 366A 20.2203(a)(2)(iv) 50.36(c)(2) 50. 73(a)(2)(vii)

LICENSEE CONTACT FOR THIS LER (12)

NAME TELEPHONE NUMBER (Include Area Code)

Brian J. Thomas, Licensing Engineer 609-339-2022 COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)

CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE CAUSE SYSTEM COMPONENT MANUFACTURER REPORTABLE TONPRDS TONPRDS IYES SUPPLEMENTAL REPORT EXPECTED (14)

(If yes, complete EXPECTED SUBMISSION DATE).

I XINO EXPECTED SUBMISSION DATE (15)

MONTH DAY YEAR ABSTRACT (Limitto 1400 spaces, i.e., approximately 15 single-spaced typewritten Imes) (16)

On May 5, 1998, the activity to charge cell 47 of the 1A 125 VOC battery using the single cell battery charger was identified as having been accomplished without proper evaluation for the isolation of the battery charger from the Class-1 E 125 VOC battery. Without properly analyzing the impact of connecting the single cell charger to the operable 125VOC and providing the necessary electrical Isolation to ensure no impact to the battery, the use of the single cell charger rendered the battery inoperable. No Technical Specification Action Statements (TSAS) were entered while the single cell battery charger was connected to the 1A 125 voe battery. Although a specific review of past occurrences has not been performed, discussion with cognizant station personnel has indicated that the single cell battery charger has been used in the past on other battery banks at both Salem Units 1 and 2, and at Hope Creek without proper isolation.

The cause of occurrence for Salem is attributed to an inadequate 1OCFR50.59 applicability review during past revisions of the maintenance procedure for single cell battery charging. The cause of the Hope Creek event is attributed to a deficient procedure and inadequate review of the separation requirements during initial plant startup.

This event is being reported in accordance with 1O CFR 50.73(a)(2)(i)(B), any condition prohibited by the plant's Technical Specifications.

• NRC FORM 366 (4-95)

• ,(' r.==========:=:~===-========-======================~=::===il NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (4-95)

~' FACILITY NAME (1)

LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION .

DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

SALEM GENERATING STATION UNIT 1 05000272 YEAR I SEQUENTIAL NUMBER IREVISION NUMBER 2 OF 4 98 - 011 - 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

PLANT AND SYSTEM IDENTIFICATION Westinghouse - Pressurized Water Reactor General Electric - BWR/4 125 VDC Batteries {EJ/-}*

• Energy Industry Identification System (EllS) codes and component function identifier codes appear as {SS/CCC}.

CONDITIONS PRIOR TO OCCURRENCE At the time of discovery, Salem Unit 1 and Unit 2 were in Mode 1 and Hope Creek was in Op Con 1.

DESCRIPTION OF OCCURRENCE On May 5, 1998, the activity to charge cell 47 of the 1A 125 VDC battery using the single cell b~ttery charger was identified as having been accomplished without proper evaluation for the isolation of the battery charger from the Class-1 E 125 VDC battery. The single cell charger was installed in accordance with maintenance procedure SC.MD-CM.ZZ-0024(Q). The power source for the single

• cell charger was a non Class-1 E power source. The procedure contained a caution concerning channel separation and that the purpose of the fuses provided in the single cell charger were to maintain channel separation. However, the fuses were not specifically analyzed for protection of the class-1 E battery. Without properly analyzing the impact of connecting the single cell charger to the operable 125VDC and providing the necessary electrical isolation to ensure no impact to the battery, the use of the single cell charger rendered the battery inoperable.* No Technical Specification Action Statements (TSAS) were entered while the single cell battery charger was connected to the 1A 125 VDC battery. TS 3.8.2.3 action f stated to, "restore the battery to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN within the following*

30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />." The single cell charger was connected to the 1A 125 VDC battery for greater than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Discussion with cognizant station personnel has indicated that the single cell battery charger has been used in the past on other battery banks at both Salem Units 1 and 2. A review of the procedure for single cell battery charging at Hope Creek was performed. This review determined that proper isolation was not being provided when connecting the single cell charger to the Hope Creek Class-1E batteries.

Based on the above, this event is reportable under 10CFR50.73(a)(2)(i)(B), any condition prohibited by the plant's. Technical Specifications.

NRC FORM 366A (4*95)

,f, r.======'.'~~==========

NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (4-95)

LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

SALEM GENERATING STATION UNIT 1 05000272 YEAR I SEQUENTIAL NUMBER I REVISION "NUMBER 3 OF 4 98 - 011 - 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

CAUSE OF OCCURRENCE The cause of occurrence for Salem is attributed to an inadequate 1OCFR50.59 applicability review during past revisions of the maintenance procedure for single cell battery charging. Although the isolation requirements in the original Salem single cell charging procedure may not have been adequate, 1OCFR50.59 applicability reviews for changes to the isolation requirements during past procedure revisions did not adequately assess the sepa_ration requirements for installing a non class-1E battery charger to an operable class-1 E battery. The cause of the Hope Creek event is attributed to a deficient procedure and inadequate review of the separation requirements during initial plant startup.

Although the above event was attributed to an inadequate 1OCFR50.59 review, improvements have been made to the 1OCFR50.59 program since the above 1OCFR50.59 reviews were performed.

Some of the improvements included the establishment of formal training and requalification requirements for 1OCFR50.59 preparers, peer reviewers, and approvers. However, as outlined in the corrective actions, additional enhancements will be made to the 1OCFR50.59 program to specifically address the issue identified in this LER.

PRIOR SIMILAR OCCURRENCES A review of LERs for Salem Units 1 and 2, and Hope Creek for the prior two years did not identify any similar occurrences associated with inadequate 1OCFR50.59 applicability reviews. However, LER 272/97-013-00 was issued concerning an instance of having measuring and test equipment (M&TE) connected to operable plant equipment. This LER identified the test equipment remained connected to the 2A Emergency Diesel Generator (EDG) while the EOG was declared operable however the test equipment was not evaluated for remaining connected to an operable EOG. This event was attributed to personnel error for intentionally leaving the test equipment in place when declaring the EDG operable contrary to the procedure requirement that directed removal of the test equipment.

SAFETY CONSEQUENCES AND IMPLICATIONS The possibility of a charger failure occurring that would damage a battery cell when the non class-1 E battery charger is connected to the class-1 E battery is minimal. Although the single cell battery charger is non-safety related, the single cell charger is provided with similar features (i.e., current limit) as the installed safety related battery chargers and should limit a fault from affecting the battery. There have been no reported c_ases of a single cell battery charger adversely impacting battery cell voltage during Salem or Hope Creek Station's use of the single cell battery charger.

Therefore, there was no impact to the health and safety of the public.

NRC FORM 366A (4-95)

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LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3)

SALEM GENERATING STATION UNIT 1 05000272 YEAR I SEQUENTIAL NUMBER IREVISION NUMBER 4 OF 4 98 - 011 - 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

CORRECTIVE ACTIONS

1. Procedure SC.MD-CM.ZZ-0024(0) was placed on administrative hold to prevent use of the procedure in the field until satisfactory resolution of the proper isolation of the single cell battery charger from th~ Class -1 E battery.

2. A review of maintenance procedures is being performed to determine if other procedures allow temporary equipment to be installed on operable systems. If maintenance procedures exist that connect temporary equipment to operable systems, a review will be performed to determine if the effect of the temporary equipment on system operation has been properly evaluated. This review will be completed by August 7, 1998.

3. The "1 OCFR50.59 Program Guidance" procedure, NC.NA-AS.ZZ-0059, will be revised to include examples concerning the connection of temporary equipment to operable systems when_

performing 1OCFR50.59 reviews. The procedure will be revised by August 31, 1998.

4 .. Procedure HC.MD-GP.ZZ-0014(0) was revised to delete the provisions for charging a single battery cell while the battery is in service.

5. This issue will be included in the next two year cycle of 1OCFR50.59 refresher training starting in July 1998.

NRC FORM 366A (4-95)