ML20023C014

Forwards Response to Suppl 3 of SER (NUREG-0528), Section 3.10, Seismic & Dynamic Qualification of Seismic Category 1 Mechanical & Electrical Equipment.

ML20023C014
Person / Time
Site:	Zimmer
Issue date:	05/05/1983
From:	Flynn J CINCINNATI GAS & ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
RTR-NUREG-0528, RTR-NUREG-528 NUDOCS 8305090486
Download: ML20023C014 (4)

Text

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y*'M T}.*C*W Mg[ [ , . 1 TI-IE CINCINNATI GAS & ELECTRIC COMI%NY [ihr~" -- - - '

CINCINN ATt OHIO 4 5201 May 5, 1983

, Docket No. 50-358 Mr. Harold Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

RE: WM. H. ZIMMER NUCLEAR POWER STATION -

UNIT 1 - SUPPLEMENTAL INFORMATION In response to a request from Mr. L. L. Kintner, NRC Licensing Project Manager, and in conjunction with Supplement 3 i to the Safety Evaluation Report (NUREG-0528), there is attached information which addresses Section 3.10 of SSER-3. The specific item addressed is Section 3.10, ' Seismic and Dynamic  ;

Qualification of Seismic Category 1 Mechanical and Electrical Equipment," Specific Concerns A(c) Flow Indicator Switch (NSSS13) .

Two copies of this letter and attachments are being sent directly to Mr. Jag Singh of EG&G. One copy is being sent directly to Mr. L. L. Kintner.

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY f'Wh"L pr, JAh1ES D. FLYNN, Manager Licensing and Environmental Affairs Department

• gg JDF: dew Enclosures bngg cc: Without Enclosure 80 John H. Frye III J. Williams, Jr.

C$ M. Stanley Livingston W. F. Christianson gg Frank F. Hooper Lynne Bernabei, Esq. ,

eg Troy B. Conner, Jr. John D. Woliver 0 John E. Dolan Deborah F. Webb k James P. Fenstermaker Steven G. Smith David K. Martin George E. Pattison

[Dk(2 y William J. Moran Andrew B. Dennison Stephen F. Koziar, Jr. L. L. Kintner (1/l)

Samuel H. Porter Jag Singh (2/2)

I Attachment A JUSTIFICATION FOR BARTON t10 DEL 288 In Supplement 3 of the Zimmer SER, Section 3.10, Seismic and Dynamic Qualification of Seismic Category I Mechanical and Electrical Equipment, under Specific Concerns A(c) the following is found:

Flow-Indicator Switch (NSSS13). The applicant is committed to replace the Barton model 288 flow indicator switch by the qualified Barton model 288A by October 1,1982. The applicant should notify the staf f in writing when this replacement is completed.

When a request for quotation was made to Barton, it was learned that the model 288A would no longer be sold as a Nuclear Grade Safety-Related piece of equipment. At this time, a closer look was taken at the way the Barton model 288 differential pressure switch is used at Zimmer.

There were four (4) model 288's used on the Flammability Control System. Two (2) were used to monitor Service Water flow to the Precooler and two (2) were used to monitor the Reactor Building Closed Cooling Water flow to the SCR Coolers, Condensor and the two (2)

Aftercoolers. It was later shown that the Precooler was not needed because adequate cooling was provided by the RBCCW system. The Service Water piping was disconnected, and the two (2) Barton 288s were removed from service. The remaining Barton 288 switches are wired to the low cooling water flow alarms on panels 1T49-P865 and IT49-P866. Based on our review, these are the only Barton 288s used in a safety-related application at Zimmer.

Telephone conversations have been held with Mr.S. James and Mr.

L. Nesbitt of General Electric. Mr. Nesbitt, the Flammability Control System design engineer,was asked what would happen if the switch f ailed to annunciate in the control room that cooling water was no longer flowing in the Flammability Control Unit. He indicated that the temperature would rise in the recombiner furnace causing a high temperature alarm and eventually a high temperature trip, which is also annunciated. One of the first things the operator would do upon receiving the high temperature alarm would be to check the cooling water system. This would be the same response the operator would make if he would have gotten the low cooling water flow alarm.

The instrumentation supplying the input to the temperature alarms is classified as Safety-Related Active and is or will be qualified to operate in their respective accident environments. Since there is a qualified system that will provide a signal to the annunciator requiring the operator to check the cooling water system, we feel that the Barton 288 switches should be reclassified as Safety-Related Passive. General Electric agrees with us and is willing to reclassify the switch.

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Several other factors also support this conclusion. These include:

1. The Zimmer containment will be inerted reducing the probability of a hydrogen burn.

2. The flammability Control System is a manual system so the operators will be watching it and the H2 and 02 levels in containment very closely.

3. The Drywell Purge System provides backup to the Flammability Control System.

4. Should the cooling water low flow alarm switch be shorted giving a false alarm, the operatot can v:atch the essential temperat ure indicators to assure himself that flow has stopped or that the alarm is false.

With the switch classified as Safety-Related Passive the main concern is whether it can maintain the R8CCW system pressure boundary. Telephone conversations with Mr. K. ~1. McLean of ITT Barton have indicated that there are no structural differences in the differential pressure units used on the Barton models 288 and 288A; there are no differences in the way the 288 and 288A are mountad to the differential pressure unit; the weight difference of the switch assembly is about 4-5 ounces; and the switch assembly can even fall of f the differential pressure unit and still not break the pressure boundary.

It is felt that the Barton model 288 as used on the cooling water for the Flammsbiity Control System should be classified as Safety-Related Passive and as such is seismically qualified based on similarity to the Barton 288A. As stated in the March 31, 1983 conference call with the NRC, backup documentation will be submitted

' by April 29, 1983.

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Attachment B International Telephone and

_ Telegraph Corporation

- ~ - ~ - Barton Instruments Company Apr11 4' 1983 900 S. Turnbull Canyon Rd.

City ofIndustry, CA 91749 (213) 961 2547 Telex 677475 P.ECE!VED NUCLEAR ENGR. DEPT.

M:2 Cincinnati Gas and Electric Wm. Zimmer Power Station US Route 51 Moscow, Ohio 45153 ATTENTION: Mr. Dave Parker, Nuclear Engineering Dept.

REFERENCE:

Wm. H. Zimmer Nuclear Power Station - Unit 1 ITT Barton Model 288 Differential Pressure Switches, W.O. 57300, Job E-5590, File # 402-3 Your letter dated March 14, 1983 ROURN TO Gentlemen:

In response to your letter of March 4,1983, which posed four questions relating to the Models 288 and 288A Switches, the following responses are provided:

First question - Are there any structural differences between the differential pressure units used on these switches?

Answer - No, there are no structural differences.

Second question - Are there any differences in the way the switches are mounted to the differential pressure units?

Answer - No, there are no differences in mounting.

Third question - Are there significant differences in the weight of the switches minus the differential pressure units (greater than 2-3 lbs)?

Answer - No, there are no differences of the magnitude suggested.

Fourth question - Should the switch fall off the differential pressure unit, would the differential pressure unit maintain the pressure boundary?

Answer - Yes, if the switch assembly should fall off the differential pressure unit, the differential pressure unit will maintain the pressure boundary.

Cincinnati Gas and Electric April 4, 1983 Page Two We trust the above responses satisfactorily address your reouest for additional input with regard to the Model 288 and Model 288A Switches.

Sincerely,l 7,V'  %

s u e ~ ftc nle r IevinJ.McLean Contrac Administrator 1

-? Y ,&u (

Victor N. Lawford Manager, DP Engineering

/af ID 04190 CC D.J. Fredrick, Cincinnati Gas & Electric

Attachment C G E N E R A L k) E L E CT R I C y , c. t e , , , o w , ,

IItas[

S' 'TTE M S DIVI! ION GENERAL ELECTRIC COMPANY 175 CURTNER AVE., SAN JOSE. CALIFORNIA 9s12s NAY 213

!!C 394, (408) 925-3307

$P_. s April 26, 1983 RESPONDS T0: 4/5/83 l elec5 i 1 CGE-1696 RESPONSE REQUESTED BY: . N/A

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Mr. J. Williams, Jr. , Sr. Vice-President g ,1 ,[, "

fluclear Operations i Cincinnati Gas & Electric Company Wm. H. Zinmer fluclear Power Station U.S. Route 50, P.O. Box 2023 Moscow, OH 45153

SUBJECT:

Un. H. ZIf tf!ER fiUCLEAR POWER STATION UflIT 1 BARTON SWITCH CLASSIFICATION CHAflGE Flamnability Control Systen Switches T49-N004A&B currently require an

" Active" classification on GE's fiaster Parts List. A 4/5/83 telecon between Messrs. F. J. Svetokovich (CGSE), S. L. James (GE), and L. 8.

Nesbitt (GE) includes a request to change the classification from active to passive.

GE, in reviewing the application, advises the change of classification from active to passive is acceptable.

If you have any questions on the subject, please contact either Steve James or me.

Very truly yours, c

y I. L. Gray l Project Manager l Zirmer 1 ILG: pes /107E cc: H. C. Brinkmann S. W. Coulter J. D. Flynn V R. J. Pruski F. J. Svetkovich D. A. Parker l

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