ML18102B641

Application for Amends to Licenses DPR-70 & DPR-75,revising SR 4.8.1.1.2.d.2 Proposed in Util 960925 Submittal Re EDG Testing

ML18102B641
Person / Time
Site:	Salem
Issue date:	10/29/1997
From:	Storz L Public Service Enterprise Group
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML18102B642	List: ML18102B641 ML18102B643
References
LCR-S95-36, LR-N970639, NUDOCS 9711040105
Download: ML18102B641 (5)

Text

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Public Service Electric and Gas

• Company Louis F. Storz Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-5700 Senior Vice President - Nuclear Operations OCT 2 9 1997 LR-N970639 LCR S95-36 Rev. 1 United States Nuclear Regulatory Commission Document Control Desk

-washington, DC 20555 REVISION TO REQUEST FOR CHANGE TO TECHNICAL SPECIFICATIONS EMERGENCY DIESEL GENERATOR TESTING SALEM GENERATING STATION UNIT NOS. 1 AND 2 FACILITY OPERATING LICENSES DPR-70 AND DPR-75 DOCKET NOS. 50-272 AND 50-311 Gentlemen:

In accordance with 10CFR50.90, on September 25, 1996, Public Service Electric and Gas (PSE&G) submitted letter LR-N96228, requesting a revision to the Technical Specifications (TS) for the Salem Generating Station Unit Nos. 1 and

2. In accordance with 10CFR50.91 (b)(1 ), a copy of this submittal was sent to the State of New Jersey.

The proposed TS changes revised Specification 3/4.8.1, "Electrical Power Systems," to change the Emergency Diesel Generator (EOG) voltage and frequency limits as a result of updated EDG load calculations and ambiguity in the testing methodology for EDG start timing.

The proposed changes were evaluated in accordance with 10CFR50.91 (a)(1 ),

using the criteria in 10CFR50.92(c) and PSE&G concluded that the request involved no significant hazards considerations. This letter provides an additional revision to surveillance requirement (SR) 4.8.1.1.2.d.2 proposed in the previously requested change. The information provided in this submittal does not impact the significant hazards considerations. Attachment 1 to this letter provides the description of the change to the surveillance requirem.ent Attachment 2 provides the new proposed TS SR 4.8.1.1.2.d.2, the other changes to TS page 3/4 8-4 previously submitted under LR-N96228 remain valid and are not affected by this revision. - ol

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Document Control Desk 2 OCT 2 9 1997 LR-N970639 Should you have any questions regarding .t.his request, we will be pleased to discuss them with you.

Sincerely, Attachments (2) c Mr. Hubert J. Miller, Administrator - Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. L. N. Olshan, Licensing Project Manager - Salem U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 14E21 Rockville, MD 20852 Ms. M. Evans (X24) .

USNRC Senior Resident Inspector - Salem Mr. K. Tosch, Manager, IV Bureau of Nuclear Engineering 33 Arctic Parkway P.O. Box 415 Trenton, NJ 08625

REF: LR-N970639 LCR S95-36, Rev. 1 STATE OF NEW JERSEY )

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COUNTY OF SALEM )

L. F. Storz, being duly sworn according to law deposes and says:

I am Senior Vice President - Nuclear Operations of Public Service Electric and Gas Company, and as such, I find the matters set forth in the above referenced letter, concerning Salem Generating Station, Unit Nos. 1 and 2, are true to the best of my knowledge, information and belief.

Subscribed and Sworn to before me this J..._ 9 day of <.?c.h> be I- , 1997

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L~& /l.dl N_9ta,!)' Public of New Jersey

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BARBARA A. POWELL

~; r NOTARY PUBLIC OF NEW JERSEY My Commission Expires Dec. 2, 1998

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ID 112160323

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.. *e Attachment 1 LR-N970639 SALEM GENERATING STATION UNIT NOS. 1 AND 2 FACILITY OPERATING LICENSES DPR-70 AND DPR-75 DOCKET NOS. 50-272 AND 50-311 CHANGE TO TECHNICAL SPECIFICATIONS EMERGENCY DIESEL GENERATOR TESTING In submittal LR-N96228, dated September 25, 1996, Public Service Electric and Gas (PSE&G) requested a change to Emergency Diesel Generator (EDG) surveillance requirement (SR) 4.8.1.1.2.d.2. This proposed change to EDG load reject surveillance requirement 4.8.1.1.2.d.2 involved revising the EDG frequency acceptance band from 60 +/- 1.2 Hz within 4 seconds to a range of 58.8 to 60.5 Hz within 4 seconds. The SR requirement was also revised to change the voltage acceptance criteria from 3950 - 4580 volts to 3910 - 4400 volts.

The change to SR 4.8.1.1.2.d.2 was proposed as a result of revisions to the EDG steady state loading calculation in response to follow up items from the Salem Electrical Distribution System Functional Inspection (EDSFI). The revision to the EDG loading calculation addressed potential EDG overloading due to excessive frequency conditions during post accident operation with auto-connected loads sequenced on the bus. The conclusion reached in the calculation was that the EDG may exceed the ratings specified by the manufacturer if the EDG is operated at greater than 60.5 Hz in the steady state condition under certain accident conditions (e.g., LOOP with a Loss of Coolant Accident). Additional calculations were ge.nerated to address upper voltage limits on the 4 Kv bus. Those calculations concluded that equipment connected to the bus can experience damage if the bus voltage is operated at greater than 4400 volts in the steady state condition.

Upon subsequent review of the proposed changes to SR 4.8.1.1.2.d.2 contained in submittal LR-N96228 following a review of surveillance testing data, PSE&G determined that the proposed changes to the load reject SR 4.8.1.1.2.d.2 are too restrictive and may lead to declaring an EOG inoperable when the EOG is still capable of performing its design basis function. Since the concern with overloading the EOGs due to excessive frequency is a steady state concern, revising the frequency band in SR 4.8.1.1.2.d.2 to between 58.8 and 60.5 Hz within four seconds is actually testing the EOGs dynamic loading abilities. Since the purpose of the load reject test is to ensure that upon loss of the largest load, the EOG can shed the load, not challenge the emergency trip features (e.g.,

overspeed), and remain in operation, PSE&G proposes to revise SR 4.8.1.1.2.d.2 as follows (changes indicated in bold):

"Verifying that, on rejection of a load greater than or equal to 820 kw, the voltage and frequency are restored to ~ 391 O and ::;; 4400 volts and 60 +/-

1.2 Hz within 4 seconds, and subsequently achieves a steady state frequency of~ 58.8 and~ 60.5 Hz."

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Attachment 1 LR-N970639 Since a significant portion of the EOG loading is shed during the load reject test, allowing the larger frequency band during the first four seconds of the surveillance test will not subject the EOG to any potential overloading concern.

Subsequently verifying that the frequency returns to within the band of 58.8 to 60.5 Hz following the initial load reject test will verify that there is no degradation of the governor that could cause the EOG to become inoperable. As stated in the proposed changes to the Bases Section 3/4.8.1 and 3/4.8.2 in submittal LR-N96228, steady state is assumed to be achieved after one minute of operation in the isochronous mode. Therefore, this proposed change to SR 4.8.1.1.2.d.2 will address the issue of overloading the EOG due to excessive frequency during steady state conditions while demonstrating acceptable EOG operation during the actual load rejection.

The change to SR 4.8.1.1.2.d.2 proposed in this submittal does not impact or change the significant hazards evaluation provided in LR-N96228, dated September 25, 1996. PSE&G continues to conclude that the proposed changes to the TS do not involve a significant hazards consideration.

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