ML19318A342

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Forwards Addl Info Re SEP Topic III-6, Seismic Design Consideration, in Response to NRC Request.Ja Blume & Associates, Seismic Reanalysis of Buried Emergency Svc Water Lines, Encl
ML19318A342
Person / Time
Site: Oyster Creek
Issue date: 06/03/1980
From: Nagai Y
JERSEY CENTRAL POWER & LIGHT CO.
To: Paulson W
Office of Nuclear Reactor Regulation
Shared Package
ML19318A343 List:
References
TASK-03-06, TASK-RR NUDOCS 8006190604
Download: ML19318A342 (7)


Text

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N. Jersey Central Power & Ught Company Madison Avenue at Punch Bowl Road Mornstown, New Jersey 07960 (201)455-8200 June 3, 1980 Mr. Walter A. Paulson Division of Operating Reactors United States Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20555

': ear Mr. Paulson:

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-2.19 SEP Topic II-6 Seismic Design Considerations This letter is in response to an NRC informal request for additional information on the seismic design of Oyster Creek Nuclear Generating Station.

The information requested is contained in a letter from Woodward-Clyde Consultants dated February 18, 1980 to Lawrence Livermore Laboratory, a copy of which was trensmitted to us by Dr. K. Jabbour (NRC) . An additional design information which has been developed by JCP&L as a result of previous NRC (Senior Seismic Review Team) requests and JCP&L initiated evaluations is also provided.

Specific responses to requests in the Woodward-Clyde letter are given in the attachment.

If there are any additional questions regarding the information requested, please contact Yoshito Nagai, Nuclear Safety & Licensing Section, (201) 455-8910.

Very truly yours, f ._

. P. )

f[~_M e._ G/[ L((f' L Yoshito Nagai '

Licensing Engineer la attachment C

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DOCKET NO. 50-219 ATIACHMENT OYSTER CREEK NUCLEAR GENERATING STATION SEP 'IOPIC III-6 SEISMIC DESIGN CONSIDEFATIONS May, 1979 O

O Information Requested by a Letter from Woodward-Clyde Consultants dated February 18, 1980

1. Information Recuested Emergency (Isolation) Condenser - drawings needed.

Resconse Available drawings and seismic analyses were previously transmitted as Enclosure 2 of JCP&L letter to the NRC (T. Wambach) dated August 24, 1979.

2. Information Requested Containment Spray Heat Exchanger - drawings needed.

Response

Specification and seismic analyses, including sketches of the unit, were transmitted as Enclosure 7 to the aforementioned JCP&L letter dated August 24, 1979.

3. Information Recuested Recirculation Pump Support - design calculations and specifications needed.

Response

Available seismic and flexibility analyses for the recirculation piping system were transmitted to the NRC by JCP&L letter dated July 9, 1979.

Recirculation pump support drawings were submitted as Enclosure 10 to JCP&L letter dated August 24, 1979. Design calculations for the supports have not been located.

4. Information Recuested Condensate Storage Tank - drawires and specifications needed.

Response

Seismic analyses of the condensate storage tank holddown were transmitted as-Enclosure 9 to our August 24, 1979 letter. Drawings of the tank were subsequently subnitted by JCP&L letter dated November 27, 1979.

5. Information Requested Motor Operated Valves - drawings and specifications needed; also procedure by which eccentricity of valve mass is considered in piping analysis.

Response

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To our knowledge, eccentricity of velve operator masses was not included eiplicitly in rlae piping seismic analyses. Accordingly, analyses were performed by Burns and Roe to evaluate this effect for typical 6 , 8- and 10-inch motor operated valves used in the Oyster Creek plant. These analyses were transmitted as Enclosure 11 to our August 24, 1979 letter. In addition, at your request, we have investigated whether there are other applications of valves with operators in safety related systems less than or equal to 4" in size. This investigation identified two such applications. These are the 2" motor-operated recirculation system bypass valves and a 1-1/2" air operated valve in the CRD hydraulic system. The worst case of these applications has been analyzed to determine the effect of operator mass eccentricity. These analyses are enclosed and show that the effect of the eccentric mass on piping stresses is small (less than 1100 psi) and has a negligible effect on total piping stresses.

6. Information Recuested Emergency Diesel Oil Storage Tank - drawings and specifications needed.

Response

Design calculations for the emergency diesel fuel oil storage tank were y transmitted as Enclosure 2 to JCP&L letter dated December 21, 1979 to the NRC (Mr. T. Wambach). These analyses included pertinent dimensional data. Please advise if additional information is needed.

7. Information Requested Control Rod Drive Hydraulic Control Units Supports and Attached Tubing -

design calculations, drawings and specification needed.

Response

Seismic qualification data for the CRD hydraulic control units and attached piping were transmitted as Enclosure 4 to our December 21, 1979 letter.

8. Information Requested Battery Racks - drawirgs aM specifications needed.

Resconse Seismic analyses and other data on the "C" battery racks were sut:mitted as Enclosure 3 to our August 24, 1979 letter. In addition, the "B" station 1 battery racks (for which original seismic analyses were not available) are being l replaced with racks identical to those used for battery "C" during the current '

refueling outage. (The "A" batteries are not required to be seimically supported.)

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9. Information Recuested I Design calculations, seimic qualification report, drawings and specification needed for 4160-480 transformer, control room panels, switch gear panels, AC and DC motor control centers, RK04 instrument panel and battery roan

distribution panel.

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Response

As pointed out by JCP&L during the July 9,1979 seismic review meeting at Oyster Creek and as further discussed in JCP&L letter to the NRC (Mr. D. G.

Eisenhut) dated February 22, 1980, JCP&L initiated a program to evaluate and strengthen as necessary the seismic anchorage and supports for this equipment.

This effort is nearing completion and all required modifications discussed in our February 22, 1980 letter will be completed during the current outage. This includes the addition of supports for the 4160-480 transformers which was previously scheduled to be completed during a future outage. It should also be noted that additional seismic qualification data on s7cific instrumentation and instrument racks RK01 thorugh RK05 were transmitted oy our letter of December 21, 1979.

10. Information Recuested Ductwork - 4160 Isolation Phase Evaluation for Structural Integrity -

drawings and specification needed.

Resoonse Enclosure 9 to our December 21, 1979 letter included results of analyses of the Class II isolated phase bus ducts. These analyses indicated the need to add structural supports to assure that the duct could not fall on other Class I equipment during a seismic event. The installation of this additional bracing has been completed,

11. Information Recuested Cable Trays with Particular Attention to Those Located in Office Building - design calculations / seismic qualification report, drawings, and specification needed.

Response

Requirements for support of cable trays are contained in Burns and Roe specification S-2299-51 " Electrical Installation", excerpts of which were 1 submitted to you with our July 9,1979 letter. Paragraph 9.48 of this i specification. states:

l "All hangers and supports for materials and equipnent to be furnished under this subcontract shall be designed to withstand lateral and vertical forces produced by accelerations due to earthquake in accordance with the following criteria: J CLASS I MATERIAIS AND EQUIPM IN CLASS I IDCATICNS The horizontal coefficients for Class I materials and equipment rigidly connected to teh Reactor Building shall be determined from the " Seismic Coefficient Curve for Reactor Building," Drawing 2299E-148, included l

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in the specification.

Class I materials and equipment located in the Reactor. Building but not rigidly connected to it, and Class I materials and equipment in other Class I locations shall be designed for a horizontal force coefficient of 0.26.

Vertical force coefficient for all Class I materids and equignent shall be 0.079.

CLASS I MATERIALS AND EQUIPMENT IN CLASS II IOCATICNS Horizontal force coefficient shall be 0.26.

Vertical force coefficient shall be 0.073.

CIASS II MATERIALS AND EQUIPMEtTI' IN CIASS I CR CIASS II IOCATIONS Horizontal force coefficient shall be 0.05 Vertical force coefficient shall be 0.00" Design analyses for the cable trays have not been located. Accordingly, as discussed in our December 21, 1979 letter, we are evaluating results of seismic tests of cable trays and supports recently conducted for several utilities to determine their applicability to the hanger types used at Oyster Creek. As discussed during the meeting with you on May 14, 1980, in Bethesda, these tests apply primarily to truss-supported cable trays rather than the rod-supported trays utilized extensively at Oyster Creek. However, the several tests which were perforred on rod-supported cable trays showd that typical cable tray systes were undamaged by the equivalent of five simulated earthquakes at peak input accelerations up to 0.66g. These results, while limited in number, indicate the rod-supported trays should have adequate capability for levels greater than those expected at Eastern sites such as Oyster Creek. Additional evaluations of the cable tray systems are in progress and we will advise you of the results of these evaluations in the near future.

In addition to the above, your letter of Septerrber 4,1979 requested design information on the buried energency service water piping between the turbine building and the intake structure. Our letter of December 21, 1979 stated that this piping is being re-analyzed using more nedern analytical techniques. This re-analysis has been

. ccznpleted. The URS/Blume report of this work, " Seismic Re-analysis of the Buried Dnergency Service Water Lines, Oyster Creek Nuclear Generating Station" is attached for your information.

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