ML18102A651

LER 96-027-00:on 961031,diesel Watt Meter Inaccuracies Were Not Accounted for in Surveillance Testing.Caused by Lack of Detailed Instructions to Load EDG in Ctr of TS Surveillance Load Band.Edg Surveillance Procedure revised.W/961202 Ltr

ML18102A651
Person / Time
Site:	Salem
Issue date:	12/02/1996
From:	Garchow D, Bernard Thomas Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-96-027, LER-96-27, LR-N96391, NUDOCS 9612100006
Download: ML18102A651 (5)

Text

OPS~G

• Public Service Electric and Gas Company P.O. Box 236 Hancocks Bridge, New Jersey 08038-0236 Nuclear Business Unit GEC 0 2 1996 LR-N96391 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:

LER 272/96-027-00 SALEM GENERATING STATION - UNIT 1 FACILITY OPERATING LICENSE NO. DPR-70 DOCKET NO. 50-272 This Licensee Event Report entitled "Diesel Watt Meter Inaccuracies Not Accounted for in Surveillance Testing" is being submitted pursuant to the requirements of the Code of Federal Regulations 10CFR50. 73 (a) (2) (i) (B).

Sincerely, Qg~~w General Manager -

Salem Operations Attachment SORC Mtg.96-169 BJT/

c Distribution ---------- .**

LER File 3.7

-~-

9612100006 961202 PDR ADOCK 05000272 S PDR The pom~r is in your h,mds.

95-2168 REV. 6/94

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED 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 NAllE (1) DOCKET NUllBER (2) PAGE (3)

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

Diesel Watt Meter Inaccuracies Not Accounted for in Surveillance Testing EVENT DATE (5) LER NUMBER (6) REPORT DATE (7) OTHER FACILITIES INVOLVED (8)

MONTH DAY YEAR YEAR I SEQUENTIAL NUMBER IREVISION NUMBER MONTH DAY YEAR FACILITY NAME Salem, Unit 2 DOCKET NUMBER 05000311 FACILITY NAME DOCKET NUMBER 10 31 96 96 - 027 - 00 12 02 96 OPERATING N 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 000 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 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 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 TO NPRDS TO NPRDS SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED MONTH DAY YEAR IVES (If yes, complete EXPECTED SUBMISSION DATE). XINO SUBMISSION DATE (15)

ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines) (16)

During a review of Emergency Diesel Generator (EDG) instrument inaccuracies, on October 31, 1996, the review determined that the inaccuracies of the EDG watt meter used for recording surveillance test data did not ensure that the EDG remained within the Technical Specification (TS) surveillance band.

The apparent cause is attributed to the lack of consideration of all aspects of the watt meter inaccuracy when the load bands were developed for the TS changes.

A contributing cause was the lack of detailed instructions to load the EDG in the center of the TS surveillance load band.

Higher accuracy Maintenance and Test Equipment (M&TE) will be used to measure the EDG kw values. EDG surveillance procedures will be revised prior to their next performance to include the use of the higher accuracy M&TE and provide an acceptance band in the surveillance procedure to ensure that the kw values remain with the TS loading bands.

This event is reportable in accordance with 10 CFR 50.73(a) (2) (i) (B), any condition prohibited by the plant's Technical Specifications.

NRC FORM 366 (4-95)

NRC FORM 366A (4-95)

• LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION U.S. NUCLEAR REGULATORY COMMISSION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3) 05000272 YEAR I SEQUENTIAL NUMBER IREVISION NUMBER 2 OF 4 SALEM GENERATING STATION UNIT 1 96 - 027 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

PLANT AND SYSTEM IDENTIFICATION Westinghouse - Pressurized Water Reactor Emergency Diesel Generators {EK/-}*

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

CONDITIONS PRIOR TO OCCURRENCE At the time of identification, Salem Units 1 and 2 were shutdown and defueled.

DESCRIPTION OF OCCURRENCE During a review of Emergency Diesel Generator (EDG) instrument inaccuracies, on October 31, 1996, the review determined that the inaccuracies of the EDG watt meter used for recording surveillance test data did not ensure that the EDG loading remained within the Technical Specification surveillance band. The Salem Unit 1 and Unit 2 Technical Specifications (TS) for EDG loading are as follows:

TS 4.8.1.1.2.a.2 states that on a monthly or weekly frequency (depending upon the number of diesel failures in the past 20 valid tests):

" .... verifying the generator is synchronized, gradually loaded to 2500-2600 kw, and operates at a load of 2500-2600 kw for greater than or equal to 60 minutes."

TS 4.8.1.1.2.c states that at least once per 6 months:

" ... The generator shall be synchronized to its emergency bus, loaded to 2500-2600 kw in less than or equal to 60 seconds, and operate at a load of 2500-2600 kw for at least 60 minutes."

TS 4.8.1.1.2.d.7 states that at least once per 18 months during shutdown:

"Verifying the diesel generator operates for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to 2760-2860 kw. During the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, the diesel generator shall be loaded to 2500 - 2600 kw. The steady state voltage and frequency shall be maintained at ~ 3950 and ~ 4580 volts and 60 +/- 1.2 Hz during this test."

The load bands for the EDG surveillances were incorporated into the Unit 1 and Unit 2 TS by amendments 148 and 126, respectively. These amendments were issued by the NRC on November 30, 1993. The 100 kw band that was included in the TS was proposed by PSE&G in License Change Request (LCR) 87-07. The 100 kw band was based on the EDG watt meter having an inaccuracy of 1% of full NRC FORM 366A (4-95)

NRC FORM 366A (4-95) *LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION U.S. NUCLEAR REGULATORY COMMISSION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3) 05000272 YEAR I SEQUENTIAL NUMBER IREVISION NUMBER 3 OF 4 SALEM GENERATING STATION UNIT 1 96 - 027 - 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

DESCRIPTION OF OCCURRENCE (cont'd) scale (+/- 40 kw) with the operators instructed to place the EDG at the midpoint of the band. However, the surveillance tests procedures did not provide any specific instructions to the operators to place the EDG in the midpoint of the band. The surveillance test procedures require the operator to load the diesel to within the TS loading band.

Although the TS loading band took into account the inaccuracy of the watt meter itself, the loading band did not take into account the additional inaccuracy associated with the readability of the meter and the sensing instrumentation

[Potential Transformers (PTs) and Current Transformers (CTs)]. This additional inaccuracy brought the total EDG watt meter inaccuracy to +/- 65 kw. With the EDG set at the midpoint of the loading band, there is no assurance that the actual kw value would be within the TS loading band. A review of past surveillance data revealed that the actual kw values could not be demonstrated to remain with the TS loading band.

This event is reportable in accordance with 10 CFR 50.73(a) (2) (i) (B), any condition prohibited by the plant's Technical Specifications.

APPARENT CAUSE OF OCCURRENCE The apparent cause is attributed to the lack of consideration of all aspects of the watt meter inaccuracy when the load bands were developed for the TS changes. A contributing cause was the lack of detailed instructions to load the EDG in the center of the load band.

PRIOR SIMILAR OCCURRENCES A review of Salem Unit 1 and 2 LERs for the past two years did not reveal any LERs submitted due to failure to consider instrument inaccuracies when recording surveillance test data from installed plant equipment.

SAFETY CONSEQUENCES AND IMPLICATIONS Public Service Electric and Gas (PSE&G) contacted the vendor of the EDGs (Coltec Industries). The vendor agreed that use of the installed watt meter would ensure that the EDG was within its design ratings. Although the EDG actual kw readings did not comply with the surveillance requirements of the TS, the EDGs are capable of performing their design function. Based on the above, there was no impact to health and safety of the public.

NRC FORM 366A (4-95)

NRC FORM 366A (4-95)

• LICENSEE EVENT REPORT (LER)

TEXT CONTINUATION U.S. NUCLEAR REGULATORY COMMISSION FACILITY NAME (1) DOCKET NUMBER (2) LER NUMBER (6) PAGE (3) 05000272 YEAR I SEQUENTIAL NUMBER I REVISION NUMBER 4 OF 4 SALEM GENERATING STATION UNIT 1 96 - 027 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)

CORRECTIVE ACTIONS

1. Higher accuracy Maintenance and Test Equipment (M&TE) will be used to measure the EDG kw values. EDG surveillance procedures will be revised prior to their next performance to include the use of the higher accuracy M&TE and provide an acceptance band in the surveillance procedure to ensure that the kw values remain with the TS loading bands.

NRC FORM 366A (4-95)