ML18029A349

Forwards Addl Info Re NRC Concerns on Structural Adequacy of Containment Vent & Purge Valves Discussed in NRC 830913 Memo to Reactor Branch Chiefs & 840810 & 1009 Telcons.Analysis Performed on 10-inch Fisher Valve Adequate

ML18029A349
Person / Time
Site:	Browns Ferry
Issue date:	01/28/1985
From:	Domer J TENNESSEE VALLEY AUTHORITY
To:	Harold Denton Office of Nuclear Reactor Regulation
References
850125, NUDOCS 8502010434
Download: ML18029A349 (19)

Text

REGULATORY INFORMATION DISTRIBUTION SY:M (RIDS)

ACCESS/ON NBR;8502910434DOC" DATEt 85/01/28 NOTARIZED:,YgS, DOCKET' FACIL;.50 259 Browns Fe'rry, Nuc,l.ear',.Power Stationi Unit-1.~ Tennessee'5000259 AUTH>>,NAHP" A/THOR AFFILIATION DOHER<J,AD

>>Tennessee" Va]leV,.Author ity

'RECI'P ~ NAMEI RECIPIENT A)FIL/ATION.

DENTON<H,R, Office>> of Nuclear Reactor>> Regulationr Director>>

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For,wardsaddi info re NRC concerns,,on.*structural adequacy of containment yeast 8.purge valves discussed-in.NpC, 83091/memo to.,Ceactqr branch chiefs 8.840810 L

)009.telcons,Analysis'er for med on 10 inch Fisher'alve> adequate.

DISTRIBUT>>ION 'CODE! A034D,>>COPIES 'RECEIVED t LTR ENCL-

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TITLE:

OR Submittal:

Containment Purginq NOTES:NHSS/pCAF

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0 TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II January 25, 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

In the Matter of the Tennessee Valley Authority Docket No. 50-259 Enclosed is additional information regarding the structural adequacy of containment vent and purge valves in the Browns Ferry Nuclear Plant.

The enclosed information is being submitted in response to verbal requests from your staff made during telephone conferences with TVA on August 10 and October 9,

1984.

We believe the enclosed information demonstrates the structural integrity of the subject valves and acceptability of the valves for continued use in Browns Ferry.

If you have any questions or need additional clarification, please get in touch with us through the Br owns Ferry Project Manager.

Very truly yours, TENNESSEE VALLE AUTHORITY James A. Domer Nuclear Engineer Subscribed a~n sworn before me+ this ~F~day of 85.

Nota Public My ommission Expires W E Enclosures cc (Enclosures):

U.S. Nuclear Regulatory Commission Region II ATTN:

James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. R. J. Clark Browns Ferry Project Manager U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue

Bethesda, Maryland 20814 85020i0434 850f25 PDR ADDCK 05000259 P

PDR An Equal Opportunity Employer

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ENCLOSURE BROWNS FERRY NUCLEAR PLANT

RESPONSE

TO NRC,CONCERNS ON CONTAINMENT PURGE VALVE OPERABILITY Listed below are NRC's outstanding concerns on.the Browns Ferry Nuclear Plant (BFN) containment purge valve operability analysis as detailed in the NRC memorandum from G; C. Lainas and J.

P. Knight to Operating Reactor Branch Chiefs dated September 13, 1983 and TVA's responses.

These concerns were further clarified in telephone conferences with the NRC.staff on August 10, 1984 and October 9,

1984.

Concern 1

The Staff concurs with 'the approach stated in the licensee's response.

However, confirmation in the form of drawings, meeting minutes, or other verification is required to demonstrate the.similarity of valve design.

Res onse 1

=Drawings'f our BFN 18-and 20-inch Rockwell'Edwards and 10-inch Fisher purge valves as well as comparative drawings of a symmetrical disc Henry Pratt valve were provided under separate cover.

The drawings provided were:

( 1) Rockwell drawing No. 225449; (2) Fisher Controls Company drawing No. F-39237; and (3) Henry Pratt Company drawing No. E-3347.

The Henry Pratt valve is the same type of valve fr om which the torque

, coefficients used in our analysis were derived.

As can be seen from the referenced drawings, the valve dies are very similar in shape.

The cover letter from the Henry,Pratt Company which transmitted the torque coefficient data is provided as attachment A.

This letter illustrates the nature of the conversations which took place between TVA and the Henry Pratt. Valve Company that led to the determination of the correct torque coefficient data to utilize.

Finally on this concern, an aspect ratio comparison was made with the Henry Pratt Mk II valve.

That comparison is provided as attachment B.

As.can be seen from that attachment;,

they compare favorably.

Concern 2

The Licensee's response on this item is acceptable to the staff.

~Res onse No response required.

~Conoern In order for the Staff to confirm the structural adequacy of the valve assembly under'the postulated accident condition as claimed by the

licensee, supporting documentation should include as a minmum a summar y of stress analysis results with calculated stresses and code allowable stresses to demonstrate that the allowable stresses in the valve-operator extended str ucture and associated interfacing hardware are not exceeded.

Res onse 3

Table 1 provides a breakdown of the calculated stresses of the pertinent valve components as compared to theallowables.

As can be seen, a large margin exists between the calculated and the allowable stresses.

Similar results can be expected for= the pertinent components of the operator and the interfacing hardwsar e.

This,.is based upon the fact that the design torque for, these components exceeds, the maximum. operating torque,(design basis loss of coolant, accident (LOCA) plus seismic event) by a comfortable margin.

Concern 4

f Operator spring torque curves are required as part of the evaluation to assure that adequate torque margin exists for the entire valve stroke when compared to the calculated dynamic and seating torques.

Table"1 included in the June 3,

1981, response includes the spring torques for valve angles of 0 and 90 only (full open and full closed).

This is unacceptable to the Staff since it does not include the region of peak dynamic torques encountered during closure. If a table is submitted instead of a curve, it should be set up in angular increments of valve stroke no less than 10 degress.

Res onse 4

Figures 1,

2 and 3 provide spring torque data for all 18-inch and 20-inch Rockwell Edwards containment purge valves installed at Browns Ferry.

Concern 5

The staff finds the Licensee's response to this item acceptable.

~Res ense No response required.

Concern 6

Until the data pertaining to the Fisher valves is received and evaluated, the Staff has no basis on which to draw conclusions with regard to either the ability or inability of the 10-inch valves to close during a DBA/LOCA at BFN 1-3.

These circumstances have existed for several years now.

Res onse 6

As stated in TVA letter dated June 7, 1983 from L. M. Mills to H. R. Denton, we entered into negotiations with Fisher Valve Company to obtain an operability analysis of our 10-inch Fisher N2 supply valve.

The Fisher Valve Company indicated that an analysis could be obtained for a valve similar to our BFN valve.

Because of the fact that the analysis was not for our specific valve and also, because we had considered this issue closed when no response had been received after several months from our June 7, 1983, submittal to your 50.54(f) request, it was determined that a contract for analysis of, our 10-inch Fisher valves would be inappropriate.

It should be pointed out that. the 10-inch Fisher valve has a symmetrical disc.

"By inspection of the Henry Pratt drawing No. E-3347 referenced in "the response to question 1,>> it can be seen, that'he. disc is similar in shape to the Henry Pratt valve disc, indicating.that the torque coefficients used in the TVA analysis of the Fisher valve are appropriate.

This position is further justified by the aspect ratios calculated for this valve disc as shown in attachment B.

The adequacy of this analysis can be further demonstrated by pointing out some of the conservatisms that it contains.

( 1) Although this valve is used only dur ing the 24-hour period, limited by our technical specifications, when the unit is being re-inerted, the analysis assumes that an instantaneous large break in combination with a seismic event is occurring during this period of operation.

(2) Even though this valve is over 130 feet from the drywell, the associated line losses and other losses from the upstream debris screen, purge valves, and flow directional changes were not accounted for in this analysis.

Furthermore; no credit was taken for the incr eased back pressure from the N2 supply which would serve to reduce the flow thr ough the valve.

Finally, this valve is in series with and secondary to the upstream Rockwell Edwards containment isolation purge valves.

The 10-inch Fisher vavle seismic qualification is addressed by Fisher Controls report "Seismic Analysis of 10-inch Butterfly Valve Assemblies,"

dated December 14, 1973.

The report is available within TVA.

In summary, we believe that the analysis performed on our 10-inch Fisher

,valve is completely adequate and the available conservatisms should more than offset any oustanding concerns.

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FIGURE 3 t'ICE llAH OGLE (18-INCH ROCKWELL EDWARDS VALVE)

GREGORY A. KVRKJIANIJR.

VICC RRCSIOCNT AND MANAOCR MARlICTINO ACHHENT A 8>EERY PRA"f"Jf C02%PAMY 4OI SOUTH HIGHLANOAVCNUC Amos+, 5x.xn'ops April 25, 1980

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844 4020 Tennessee Valley Authority 400 Commerce Avenue W9C155 Knoxville, TN 37901

,I Attention:

R. Bryon

Dear Mr. Bryon:

In response to our rec'ent phone conversation, enclosed herewith are '.vo

~2) copies

~. v~."ives coe ficiInts associated with Peart valves that can be used in determining the, pressure drop and torque for the Rockwell valves you described.

For the valve size you indicated, I would expect the maximum fluidynamic torque to occur somewhere from the 40 to 50 position range.

Torques are calculated as noted in the Appendix, page 13 of AWWA C504, copy enclosed.

I If you have any questions regarding the use of this 'material, please feel free to contact me.

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ATTACHMENT B 1.

The aspect ratio data for the Rockwell-Edwards 18-and 20-inch butterfly valves and Fisher Controls 10-inch valve for comparison with a Henry Pratt valve with a geometrically similar disk was obtained.

The flow coeffic'ient'ata"used in TVA's operability analysi's f'r the"Fisher"and..Rockwell-Edwards valves is representative of this'particular Henry Pratt valve.

Aspect ratio is defined as the "iatio of disk thickness at a particular position to,the overall disk diameter.

The tabulation

'elow shows aspect ratios at-two-positions (the disk center and the disk edge) for TVA's Fisher and Rockwell-Edwards valve types and the representative Henry Pratt valve.

As ect Ratio Center

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Rockwell-Edwards 18-inch Rockwell-Edwards 20-inch Fisher Controls 10-inch Henry Pratt MKIX

'.212 0.209 0.228 0.232 0.025 0.022 0.000" 0.022 "The edge is rounded based on data provided by the site, making determination of this value difficult.

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