ML18079A560

Submits Updated Response Re Seismic Data for Electrical, Instrumentation & Mechanical Components.Updates 790323 Submittal Re Item 11-b Concerning Seismic Qualification of Vital Appurtenances Associated W/Diesel Generators

ML18079A560
Person / Time
Site:	Salem
Issue date:	07/16/1979
From:	Mittl R Public Service Enterprise Group
To:	Parr O Office of Nuclear Reactor Regulation
References
NUDOCS 7907190527
Download: ML18079A560 (3)

Text

i PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /430-7000 July l6, l979 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. c.

20555 Attention:

Gentlemen:

Mr. Olan D. Parr, Chief Light Water Reactors Branch 3 Division of Project Management RESPONSE TO REQUESTS FOR ADDITIONAL INFORMATION NO. 2 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 5 0-3ll.

Public Service Electric and Gas Company hereby submits six*t;.y (60) copies of its updated response related to the Seismic Qualification data for electrical, instrumentation and mechanical components.

The attached information updates the March 23, 1979 submittal related to item 11-b concerning seismic qualification of the vital appurtenances associated to the Diesel Generators.

Should you have any questions, please do not hesitate to contact us.

Enclosure The Energy People p7;;;;;1 k~ L. Mittl General Manager -

Licensing and Environment Engineering and Construction 95-2001 (400M) 9-77

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SALEM NUCLEAR GENERATING STATION UNIT NO. 2 NRC SEISMIC QUALIFICATION REVIEW RESPONSES TO ADDITIONAL INFORMATION REQUESTS The NRC Seismic Qualification Review Team met with PSE&G per-sonnel at the Salem site on February 26-28, 1979 to conduct a review of the seismic qualification data for electrical, in-strumentation and mechanical components.

In a previous sub-mittal to the NRC staff on March 23, 1979, we responded to additional information requests as identified at the meeting.

The following information updates the March 23, 1979 submittal related to item 11-b concerning seismic quali-fication of the vital appurtenances associated to the Diesel-Generators.

11.

Diesel-Generators and Vital Appurtenances (b)

Area of Concern:

The major components of the diesel generator have been analyzed for structural integrity at an acceleration level higher than the acceleration required at Salem Unit 2.

No information was available at the February 26-28 meeting for the NRC staff to conclude that those appurtenances necessary for startup and continued opera-tion of the diesel generator can perform their required function during the earthquake event.

Therefore, addi-tional information is required for the NRC staff to com-plete the review.

Response

Discussion with Alco had indicated that the emergency diesel generators at Diablo Canyon, were the same make and model as the diesels used at Salem Units 1 and 2.

In addition, the appurtenances were similar both functionally and in physical arrangement with few excep-tions as noted below.

Public Service verified this by contacting Pacific Gas and Electric Co. and further visiting the Diablo Canyon facility.

During the Diablo Canyon visit, some differ-ences were noted and are as follows:

(1)

Differences were found between Diablo Canyon and Salem's EDG supports.

PSE&G will modify the Salem support so it will be identical to Diablo Canyon.

The following modifications will be performed:

a.

The space between the bottom flange of the EDG skid beams and the floor slab shall be com-pletely grouted.

b.

The isolator pads supporting the engine shall be welded to the top flange of the skid beams.

c.

Seismic stays similar to those at Diablo Canyon shall be added at the ends of the skid beams.

(2)

At one end of the skid support the Salem Unit has two tube and shell heat exchangers whereas Diablo Canyon has a radiator housing at the same loca-tion.

The weights, however, are similar in both cases, and only represent approximately 5 percent of the EDG mass.

Therefore, the effect on the seismic response of the units is negligible.

(3)

Diablo Canyon has a 550 gallon fuel oil tank en-closed between the skid beams.

Salem does not have this arrangement.

This represents only a small percentage of the total mass and since it is located at the support base the enclosures of the tank stiffening the skid beam webs.

However, the effect on the seismic response for the engine and the generator is negligible.

To verify that Diablo Canyon's response curves com-pletely envelope the Salem curves, the Diablo Canyon's horizontal and vertical ground response spectra were superimposed onto Salem's response spectra for the ele-vation for which the diesels where located the results were positive throughout the frequency range.

Pacific Gas and Electric Company has informed Public Service the seismic analysis has been performed on the diesel appurtenances and had been accepted by the NRC Seismic Qualification Review Team.

In conclusion, Salem Units 1 and 2 diesel generator appurtenances are seismically qualified due to the following reasons:

(1)

They are similar to Diablo Canyon's in design and arrangement.

(2)

Salem's response spectra falls within Diablo Canyon's response curve.

(3)

Salem has a lower seismic input at all modal fre-quencies.

RWS:peg M P79 29 22 1/2